TECHNIQUES FOR SIDELINK RESOURCE INFORMATION FORWARDING

Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may be configured to trigger a sidelink message to one or more UE of set of multiple other UEs. The first UE may then generate the sidelink message based at least in part on the triggering. In some cases, the sidelink message may include time and frequency resource information associated with sidelink control information received and processed by the first UE. The first UE may multiplex the sidelink message with a sidelink data message. The first UE may then transmit the sidelink message multiplexed with the sidelink data message to the one or more UE of the set of multiple other UEs.

FIELD OF TECHNOLOGY

The following relates to wireless communications, including techniques for sidelink resource information forwarding.

BACKGROUND

Some wireless communications systems may support Mode 2 sidelink operation, in which UEs unilaterally (e.g., without instruction from a base station) “reserve” resources for sidelink transmissions. Improved techniques for UEs operating in sidelink operation, such as but not limited to Mode 2 sidelink operation is desirable.

SUMMARY

The described techniques relate to improved methods, systems, devices, and apparatuses that support techniques for sidelink resource information forwarding. Generally, the present disclosure provides techniques for transmitting resource information for sidelink communications which reduces sidelink conflicts while preventing significant increases in control signaling overhead. In particular, according to techniques described herein, UEs may be configured with one or more “reporting configurations” for transmitting (e.g., forwarding) time/frequency resource information for sidelink communications. For example, a first user equipment (UE) may receive and process sidelink control information (SCI) which acts to reserve sidelink resources for future communications by other UEs. The first UE may additionally identify a conflict between multiple sidelink communications which overlap in the time and/or frequency domain. Upon identifying the conflict, the first UE may transmit a sidelink message which includes time/frequency resource information based on SCIs that the UE received and processed prior to detection of the conflict. The forwarded time/frequency resource information may be the encoded SCIs themselves or may be the decoded data from the SCIs. By transmitting (e.g., forwarding) time/frequency resource information, reporting configurations described herein may serve to reduce or eliminate conflicts between sidelink communications without unduly increasing network congestion.

A method for wireless communication at a first UE is described. The method may include triggering a sidelink message to one or more UE of a set of multiple other UEs, generating the sidelink message based on the triggering, the sidelink message including time and frequency resource information associated with sidelink control information received and processed by the first UE, multiplexing the sidelink message with a sidelink data message, and transmitting the sidelink message multiplexed with the sidelink data message to the one or more UE of the set of multiple other UEs.

An apparatus for wireless communication at a first UE is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to trigger a sidelink message to one or more UE of a set of multiple other UEs, generate the sidelink message based on the triggering, the sidelink message including time and frequency resource information associated with sidelink control information received and processed by the first UE, multiplex the sidelink message with a sidelink data message, and transmit the sidelink message multiplexed with the sidelink data message to the one or more UE of the set of multiple other UEs.

Another apparatus for wireless communication at a first UE is described. The apparatus may include means for triggering a sidelink message to one or more UE of a set of multiple other UEs, means for generating the sidelink message based on the triggering, the sidelink message including time and frequency resource information associated with sidelink control information received and processed by the first UE, means for multiplexing the sidelink message with a sidelink data message, and means for transmitting the sidelink message multiplexed with the sidelink data message to the one or more UE of the set of multiple other UEs.

A non-transitory computer-readable medium storing code for wireless communication at a first UE is described. The code may include instructions executable by a processor to trigger a sidelink message to one or more UE of a set of multiple other UEs, generate the sidelink message based on the triggering, the sidelink message including time and frequency resource information associated with sidelink control information received and processed by the first UE, multiplex the sidelink message with a sidelink data message, and transmit the sidelink message multiplexed with the sidelink data message to the one or more UE of the set of multiple other UEs.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the triggering the sidelink message may include operations, features, means, or instructions for detecting a conflict arising from at least partial overlap of sidelink communications transmitted or scheduled to be transmitted by the set of multiple other UEs.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, detecting the conflict may include operations, features, means, or instructions for receiving at least two sidelink transmissions from the set of multiple other UEs on overlapping time and frequency resources.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, detecting the conflict may include operations, features, means, or instructions for receiving an indication that at least two sidelink transmissions from the set of multiple other UEs may be scheduled to overlap in time and frequency resources.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, detecting the conflict may include operations, features, means, or instructions for receiving at least two sidelink transmissions from the set of multiple other UEs at a same time.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the sidelink message multiplexed with the sidelink data message may be transmitted in a first slot and the method, apparatuses, and non-transitory computer-readable medium may include further operations, features, means, or instructions for generating additional sidelink messages based on the triggering the sidelink message, the additional sidelink messages including updated time and frequency resource information associated with additional sidelink control information received and processed by the first UE after the triggering the sidelink message and transmitting the additional sidelink messages according to a periodicity for a quantity of slots.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the periodicity may be every slot during the quantity of slots.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving an indication of the quantity of slots, the periodicity, or both, where the first UE transmits the additional sidelink messages based on receiving the indication of the quantity of slots, the periodicity, or both.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining the quantity of slots, the periodicity, or both, based on network congestion, where the first UE transmits the additional sidelink messages based on determining the quantity of slots, the periodicity, or both.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the time and frequency resource information included in the sidelink message may be based on the sidelink control information received and processed by the first UE prior to an end of a processing time interval.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, via the sidelink message, an indication of the triggering the sidelink message.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for generating the sidelink message during a preparation time interval, where a start of the preparation time interval may be based on the triggering the sidelink message.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving a reporting configuration for transmission of the sidelink message, where the sidelink message multiplexed with the sidelink data message may be transmitted in accordance with the reporting configuration.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, generating the sidelink message may include operations, features, means, or instructions for preparing the sidelink control information received and processed by the first UE for forwarding.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the time and frequency resource information associated with the sidelink control information indicates a first set of sidelink resources which may be available for subsequent sidelink communications, a second set of sidelink resources which may be not available for subsequent sidelink communications, or both.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the sidelink message multiplexed with the sidelink data message may be transmitted via a sidelink control channel, a sidelink shared channel, a sidelink feedback channel, or any combination thereof.

A method for wireless communication at a first UE is described. The method may include detecting a conflict arising from at least partial overlap of sidelink communications transmitted or scheduled to be transmitted by a set of multiple other UEs, generating a sidelink message based on the detected conflict, the sidelink message including time and frequency resource information associated with SCI received and processed by the first UE prior to detection of the conflict, and transmitting the sidelink message to one or more of the set of multiple other UEs.

An apparatus for wireless communication at a first UE is described. The apparatus may include a processor, memory coupled with the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to detect a conflict arising from at least partial overlap of sidelink communications transmitted or scheduled to be transmitted by a set of multiple other UEs, generate a sidelink message based on the detected conflict, the sidelink message including time and frequency resource information associated with SCI received and processed by the first UE prior to detection of the conflict, and transmit the sidelink message to one or more of the set of multiple other UEs.

Another apparatus for wireless communication at a first UE is described. The apparatus may include means for detecting a conflict arising from at least partial overlap of sidelink communications transmitted or scheduled to be transmitted by a set of multiple other UEs, means for generating a sidelink message based on the detected conflict, the sidelink message including time and frequency resource information associated with SCI received and processed by the first UE prior to detection of the conflict, and means for transmitting the sidelink message to one or more of the set of multiple other UEs.

A non-transitory computer-readable medium storing code for wireless communication at a first UE is described. The code may include instructions executable by a processor to detect a conflict arising from at least partial overlap of sidelink communications transmitted or scheduled to be transmitted by a set of multiple other UEs, generate a sidelink message based on the detected conflict, the sidelink message including time and frequency resource information associated with SCI received and processed by the first UE prior to detection of the conflict, and transmit the sidelink message to one or more of the set of multiple other UEs.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the sidelink message may be transmitted in a first slot and the method, apparatuses, and non-transitory computer-readable medium may include further operations, features, means, or instructions for generating additional sidelink messages based on the detected conflict, the additional sidelink messages including updated time and frequency resource information associated with additional SCI received and processed by the first UE after detection of the conflict and transmitting the additional sidelink messages according to a periodicity for a quantity of slots.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the periodicity may be every slot during the quantity of slots.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving an indication of the quantity of slots, the periodicity, or both, where the first UE transmits the additional sidelink messages based on receiving the indication of the quantity of slots, the periodicity, or both.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for determining the quantity of slots, the periodicity, or both, based on network congestion, where the first UE transmits the additional sidelink messages based on determining the quantity of slots, the periodicity, or both.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the time and frequency resource information included in the sidelink message may be based on the additional SCI received and processed by the first UE prior to an end of a processing time interval.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for transmitting, via the sidelink message, an indication of the detected conflict.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for generating the sidelink message during a preparation time interval, where a start of the preparation time interval may be based on detection of the conflict.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, detecting the conflict may include operations, features, means, or instructions for receiving at least two sidelink transmissions from the set of multiple other UEs on overlapping time and frequency resources.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, detecting the conflict may include operations, features, means, or instructions for receiving an indication that at least two sidelink transmissions from the set of multiple other UEs may be scheduled to overlap in time and frequency resources.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, detecting the conflict may include operations, features, means, or instructions for receiving at least two sidelink transmissions from the set of multiple other UEs at the same time.

Some examples of the method, apparatuses, and non-transitory computer-readable medium described herein may further include operations, features, means, or instructions for receiving a reporting configuration for transmission of the sidelink message, where the sidelink message may be transmitted in accordance with the reporting configuration.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, generating the sidelink message, transmitting the sidelink message, or both may include operations, features, means, or instructions for forwarding the SCI received and processed by the first UE.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the time and frequency resource information associated with the SCI indicates a first set of sidelink resources which may be available for subsequent sidelink communications, a second set of sidelink resources which may be not available for subsequent sidelink communications, or both.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, generating the sidelink message may include operations, features, means, or instructions for multiplexing the time and frequency resource information with a sidelink data message, where transmitting the sidelink message may be based on the multiplexing.

In some examples of the method, apparatuses, and non-transitory computer-readable medium described herein, the sidelink message may be transmitted via a sidelink control channel, a sidelink shared channel, a sidelink feedback channel, or any combination thereof.

DETAILED DESCRIPTION

Some wireless communications systems may support Mode 2 sidelink operation, in which UEs unilaterally (e.g., without instruction from a base station) “reserve” resources for sidelink transmissions based on UE sensing (e.g., monitoring) of a transmission medium of the sidelink network. In Mode 2 sidelink operation, conflicts may arise when UEs are unable to communicate with each other. For example, while a first UE may be able to communicate with a both a second and a third UE, the second UE and the third UE may not be able to communicate with each other due to an obstruction or distance between the two. As a result, the second UE and the third UE could potentially both reserve the same sidelink resources for respective sidelink transmissions, resulting in a conflict that could be observed by the first UE.

In order to mitigate the effect of sidelink conflicts between UEs that are not in communication with each other, an observing UE (such as the first UE) may identify that conflicts are occurring and may indicate the observance of a conflict to neighboring UEs or the UEs involved in the conflict. However, such indications may only be intended to trigger retransmission of the conflicted signals. A wireless communications system may enable UEs to transmit (e.g., forward, relay) additional sidelink resource information to neighboring UEs in order to improve sidelink network coordination and reduce conflicts. However, frequently forwarding large quantities of sidelink resource information may significantly increase signaling overhead and congestion within a wireless communications system, thereby detrimentally affecting the efficiency and reliability of wireless communications.

Accordingly, aspects of the present disclosure may provide techniques for transmitting resource information for sidelink communications which reduces sidelink conflicts while preventing significant increases in signaling overhead. In particular, according to techniques described herein, UEs may be configured with one or more “reporting configurations” for transmitting (e.g., forwarding) time/frequency resource information for sidelink communications to improve sidelink network coordination and reduce network congestion.

For example, a first UE may receive and process sidelink control information (SCI) which acts to reserve sidelink resources for future communications by other UEs. The first UE may additionally identify a conflict between multiple sidelink communications which overlap in the time and/or frequency domain. The conflict may be identified based on actual receipt of the multiple overlapping sidelink communications, or by identifying conflicting reservations of overlapping sidelink resources. Upon identifying the conflict, the first UE may transmit a sidelink message which includes time/frequency resource information based on SCIs that the first UE received and processed prior to detection of the conflict. The forwarded time/frequency resource information may include the encoded SCIs themselves, the decoded data from the SCIs, or both. The time/frequency resource information may include resources which are or are not available for subsequent sidelink communications.

In some aspects, the first UE may transmit sidelink messages for time/frequency resource information according to one or more reporting configurations. For example, in accordance with a first reporting configuration, the first UE may transmit a single sidelink message with sidelink time/frequency resource information upon detecting a conflict. According to other reporting configurations, the first UE may transmit a sidelink message with sidelink time/frequency resource information within every slot for a predetermined quantity of slots, based on a periodicity (e.g., within every n slots) for a predetermined quantity of slots, or both.

Aspects of the disclosure are initially described in the context of wireless communications systems. Additional aspects of the disclosure are described in the context of example resource configurations and an example, process flow. Aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flowcharts that relate to techniques for sidelink resource information forwarding.

The UEs115and the base stations105of the wireless communications system100may be configured to provide for the transmission of resource information for sidelink communications which reduces sidelink conflicts while preventing significant increases in signaling overhead. According to techniques described herein, UEs115of the wireless communications system100may be configured with one or more “reporting configurations” for transmitting (e.g., forwarding) time/frequency resource information for sidelink communications to improve sidelink network coordination and reduce network congestion.

For example, a first UE115of the wireless communications system may receive and process SCI which acts to reserve sidelink resources for future communications by other UEs115. The first UE115may additionally identify a conflict between multiple sidelink communications which overlap in the time and/or frequency domain. The conflict may be identified based on actual receipt of the multiple overlapping sidelink communications, or by identifying conflicting reservations of overlapping sidelink resources. Upon identifying the conflict, the first UE115may transmit a sidelink message which includes time/frequency resource information based on SCIs that the first UE115received and processed prior to detection of the conflict. The forwarded time/frequency resource information may include the encoded SCIs themselves, the decoded data from the SCIs, or both. The time/frequency resource information may include resources which are or are not available for subsequent sidelink communications.

In some aspects, the first UE115may transmit (e.g., forward) sidelink messages for time/frequency resource information according to one or more reporting configurations. For example, in accordance with a first reporting configuration, the first UE115may transmit a single sidelink message with sidelink time/frequency resource information upon detecting a conflict. According to other reporting configurations, the first UE115may transmit a sidelink message with sidelink time/frequency resource information within every slot for a predetermined quantity of slots, based on a periodicity (e.g., within every n slots) for a predetermined quantity of slots, or both.

Techniques described herein may improve sidelink network coordination to reduce sidelink conflicts while preventing significant increases in signaling overhead. In some aspects, techniques described herein may enable UEs115to transmit (e.g., forward, relay) sidelink time/frequency resource information according to one or more reporting configurations upon identifying a conflict in sidelink communications. By transmitting time/frequency resource information in accordance with reporting configurations, techniques described herein may reduce or eliminate sidelink conflicts during Mode 2 sidelink operation, for example, thereby improving an efficiency and reliability of sidelink communications.

FIG. 2illustrates an example of a wireless communications system200that supports techniques for sidelink resource information forwarding in accordance with aspects of the present disclosure. In some examples, wireless communications system200may implement aspects of wireless communications system100. Wireless communications system200may support techniques for forwarding time and frequency resource information for sidelink communications.

The wireless communications system200may include a base station105-a,first UE115-a,a second UE115-b,and a third UE115-c,which may be examples of UEs115, base stations105, and other wireless devices as described with reference toFIG. 1. In some aspects, one or more of the UEs115may communicate with the base station105-ausing a communication link205(e.g., communication link205-a), which may be an example of an NR or LTE link between the base station105-aand the respective UE115. In some aspects, communication links205between the base station105-aand the respective UEs115(e.g., communication link205-a) may include examples of access links (e.g., Uu links) which may include bi-directional links that enable both uplink and downlink communication. For example, the first UE115-amay transmit uplink signals, such as uplink control signals or uplink data signals, to the base station105-ausing the communication link205-aand the base station105-amay transmit downlink signals, such as downlink control signals or downlink data signals, to the first UE115-ausing the communication link205-a.

In some aspects, the first UE115-a,the second UE115-b,and the third UE115-cmay communicate with one another using communication links205-band205-c,which may be examples of sidelink communication links or PC5links. For example, the first UE115-amay communicate with the second UE115-band the third UE115-cvia communication links205-band205-c,respectively. In some cases, wireless communications between wireless devices (e.g., UEs115and base station105-a) of the wireless communications system200may be blocked, or otherwise interrupted, by obstructions230, noise, weather conditions, and the like. For example, an obstruction230may block, or otherwise interrupt, direct wireless communications between the second UE115-band the third UE115-c.

In some aspects, the communication links205-band205-cbetween the respective UEs115(e.g., sidelink communication links) may be included within a sidelink network of the wireless communications system200. The sidelink network (e.g., sidelink network including the communication links205-b,205-c) may be configured to operate in “Mode 1,” “Mode 2,” or other sidelink modes where resources are shared between UEs. While operating in Mode 1, the sidelink network (e.g., communication links205-b,205-c) may be managed (e.g., coordinated) by the base station105-a.In this regard, during Mode 1 operation, the base station105-amay manage resource allocation over the communication links205-b,205-c,and may allocate sets of resources within the communication links205-b,205-cto the respective UEs115-a,115-b,and115-cvia the communication link205-aand/or other communication links205between the base station105-aand the respective UEs115. In some cases, the base station105-amay allocate sets of sidelink resources to the respective UEs115during Mode 1 operation via RRC signaling, downlink control information (DCI) messages (e.g., DCI 3_0), or both. During Mode 1 operation, the base station105-amay allocate sidelink resources via dynamic grants, configured grants (e.g., type 1 configured grants, type 2 configured grants), or both. Within Mode 1 operation, a modulation and coding scheme (MCS) used for communications over the communication links205-b,205-c(e.g., sidelink communication links205-b,205-c) may be left up to the respective UEs115, within limits which are pre-configured at the UEs115and/or signaled by the base station105-a.

Comparatively, while operating in Mode 2, the sidelink network (e.g., communication links205-b,205-c) may not be managed (e.g., may not be coordinated) by the base station105-a.Without coordination or management of the resources of the sidelink network during the Mode 2 operation, the UEs115may be configured to monitor the sidelink network (e.g., monitor sidelink communication links205-b,205-c), and determine sets of sidelink resources which are available for transmission of sidelink messages via the sidelink communication links205-b,205-c.For example, the first UE115-amay “autonomously” determine sidelink resources which are to be used within the communication links205-b,205-cby monitoring the communication links205-b,205-c(e.g., perform channel sensing), and blindly decoding all physical sidelink shared channels (PSSCHs) within the communication links205-b,205-cto identify sidelink resources which have been reserved by other UEs115(e.g., second UE115-b,third UE115-c). Subsequently, the first UE115-amay report available sidelink resources to the upper layer, and may transmit a sidelink communication (e.g., SCI) which reserves a set of sidelink resources for a sidelink communication to be performed (e.g., transmitted, received) at the first UE115-a.In this regard, Mode 2 operation of the sidelink network including the communication links205-b,205-cmay follow contention-based access procedures in which the various UEs115to “compete” for the use of the sidelink network, including the communication links205-b,205-c.

In the context of Mode 2 sidelink operation, conflicts may arise when UEs115are unable to communicate with each other and continue to unilaterally reserve sets of sidelink resources for sidelink communications. For example, as shown inFIG. 2, the obstruction230may block, or otherwise interrupt, direct wireless communications between the second UE115-band the third UE115-c.In this example, the second UE115-bmay transmit an SCI which reserves a first set of sidelink resources for a first sidelink communication at the second UE115-b.Subsequently, because the third UE115-cwas unable to receive the SCI from the second UE115-b,the third UE115-cmay transmit an additional SCI which reserves a second set of sidelink resources for a second sidelink communication at the third UE115-c,where the second set of sidelink resources overlaps with (e.g., conflicts with) the first set of sidelink resources in the time and frequency domain.

Continuing with the same example, the second UE115-band the third UE115-cmay transmit the first and second sidelink communications, respectively. Due to the fact that the first and second sidelink communications conflict with one another (e.g., collide with one another), the first UE115-amay be unable to receive and/or decode the respective sidelink communications. In such cases, upon receiving conflicting (e.g., colliding) sidelink transmissions, the first UE115-amay transmit a sidelink message to the second UE115-band the third UE115-c,where the sidelink message includes a conflict indicator (e.g., post-collision indicator, half-duplex indicator) indicative of the conflict. The sidelink message may include SCI-1 and/or SCI-2 transmitted via a physical sidelink control channel (PSCCH), a PSSCH, indicated via sequences or preambles transmitted over a physical sidelink feedback channel (PSFCH), or any combination thereof. In this example, the sidelink message may trigger a retransmission of the respective sidelink communications. However, according to some wireless communications systems, the sidelink message triggering the retransmission may not indicate which sidelink resources the respective UEs115-b,115-cshould use (or refrain from using) to perform the retransmissions.

Some wireless communications systems may attempt to reduce or eliminate conflicts (e.g., collisions) of sidelink communications by enabling UEs115to “forward” reservations of sidelink resources (e.g., forward SCI which reserves sidelink resources) used to other UEs115. For example, upon receiving the first SCI from the second UE115-bwhich reserves the first set of sidelink resources, the first UE115-amay relay, or forward, an indication of the first set of sidelink resources to the third UE115-cso that the third UE115-cdoes not attempt to claim the same set of sidelink resources. In this regard, the UE115-amay relay indications of preferred sidelink resources (e.g., available sidelink resources) and/or non-preferred sidelink resources (e.g., non-available sidelink resources) between the second UE115-band the third UE115-c(and/or other UEs115) in order to reduce and/or prevent sidelink conflicts, and to improve sidelink resource selection during Mode 2 sidelink operation.

Sidelink time/frequency resource information may be transmitted (e.g., forwarded, relayed) separately (e.g., via standalone SCI), in conjunction with other sidelink data transmissions (e.g., multiplexed or piggybacked with a PSSCH transmission), or both. Forwarding sidelink resource information via standalone SCI transmissions may reduce a latency at which sidelink resource information is transmitted/forwarded, thereby reducing the likelihood that forwarded sidelink resource information is “stale” by the time it is received by other UEs115and enabling the other UEs115sufficient time to receive/process the forwarded information. However, the standalone transmission/forwarding of sidelink resource information may increase network congestion. Comparatively, multiplexing (e.g., piggybacking) sidelink resource information with other sidelink transmissions may reduce network congestion. However, multiplexing sidelink resource information with other sidelink transmissions may increase latency, as other sidelink transmissions may be transmitted only periodically or aperiodically (as opposed to dynamically). Processing delays associated with preparing packets for other sidelink transmissions and/or the periodicity/arrival rate of data packets may further increase latency when multiplexing sidelink resource information with other sidelink transmissions.

Some wireless communications systems may attempt to implement techniques for sidelink time/frequency resource information forwarding based on characteristics of an expected or potential conflict, a type of conflict, sensing operations (e.g., SCI sensing operations) performed by the respective UEs115, characteristics of sidelink resources with respect to cast types, and the like. However, in the context of sidelink resource information forwarding, there is a tradeoff between improved sidelink network coordination and increased signaling overhead. For example, if the first UE115-arefrains from transmitting/forwarding any sidelink resource information (e.g., refrain from forwarding detected/sensed SCI), there may be an increase in conflicts within the sidelink network due to the lack of coordination between UEs115. Conversely, if the first UE115-atransmits/forwards all sidelink resource information (e.g., forwards all detected/sensed SCI), signaling overhead and congestion within the wireless communications system200may be significantly increased, thereby detrimentally affecting the reliability of sidelink communications. Moreover, transmitting/forwarding all sidelink resource information may consume shared sidelink resources which may be used for other sidelink communications at the first UE115-aand/or other UEs115, detrimentally affecting the utilization of sidelink resources.

Accordingly, the UEs115and the base station105-aof the wireless communications system200may be configured to provide for the transmission of time/frequency resource information for sidelink communications which reduces sidelink conflicts while preventing significant increases in signaling overhead. In particular, according to techniques described herein, UEs115of the wireless communications system200may be configured with one or more “reporting configurations” for transmitting (e.g., forwarding) time/frequency resource information for sidelink communications to improve sidelink network coordination and reduce network congestion.

For example, the first UE115-amay receive one or more reporting configurations210for transmitting sidelink messages225including time/frequency resource information for sidelink communications. The first UE115-amay receive the indication of the one or more reporting configurations210from the base station105-a,another wireless device (e.g., another UE115), or both. In some cases, the indication of the one or more reporting configurations210may be conveyed via an RRC message, a DCI message, a synchronization signal block (SSB) message, a system information broadcast (SIB) message, an SCI message, or any combination thereof. In additional or alternative cases, the first UE115-amay be configured (e.g., pre-configured) with the one or more reporting configurations210without signaling.

In some aspects, the one or more reporting configurations210may include one or more parameters or characteristics for transmitting (e.g., forwarding) sidelink messages225including time/frequency resource information for sidelink communications. Parameters associated with a reporting configuration210may include, but are not limited to, characteristics or rules for detecting a conflict of sidelink communications, a quantity of slots for transmitting sidelink messages225including time/frequency resource information, a periodicity for transmitting sidelink messages225including time/frequency resource information, data (e.g., time/frequency resource information) to be included within sidelink messages225and the like. For instance, a reporting configuration210may indicate that the first UE115-ais to transmit time/frequency resource information for a defined quantity of slots after detecting a sidelink conflict, according to a periodicity (e.g., every slot, every other slot) following a detected conflict, or any combination thereof.

Additionally or alternatively, a reporting configuration210may be associated with a set of rules or other parameters which may be used by the first UE115-ato determine parameters/characteristics of the respective reporting configuration210. In this regard, the first UE115-amay be configured with one or more reporting configurations210which may control when and/or how often the first UE115-ais to transmit (e.g., relay, forward) sidelink messages225including time/frequency resource information for sidelink communications. In additional or alternative aspects, the first UE115-amay be configured (e.g., pre-configured) with one or more reporting configurations210. In such cases, the first UE115-amay be configured to determine a reporting configuration210which is to be used without any signaling from the base station105-a.

In some aspects, the first UE115-amay monitor a sidelink network (e.g., monitor sidelink communication links205-band205-c). The first UE115-amay monitor the sidelink network based on receiving the one or more reporting configurations210. In some aspects, the first UE115-amay monitor the sidelink network by decoding (e.g., blindly decoding) sidelink communications performed over the sidelink communication link205-b,sidelink communication link205-c,and/or additional sidelink communication links205. For example, the first UE115-amay monitor the sidelink network by blindly decoding sidelink communications which are sensed within a PSCCH and/or PSSCH of the sidelink network. The first UE115-amay monitor the sidelink network in order to identify sidelink resources which have been reserved by the second UE115-band/or the third UE115-c,to determine characteristics associated with the sidelink network, or any combination thereof.

The first UE115-amay determine a network congestion of the sidelink network. The first UE115-amay determine the network congestion based on receiving the reporting configurations210, monitoring the sidelink network, or both. Network congestion may be associated with a relative quantity, density, or frequency of sidelink communications performed over the sidelink network. For example, in cases where the first UE115-aidentifies large quantities of sidelink communications performed over the sidelink network, the first UE115-amay be configured to determine that the sidelink network is associated with relatively high network congestion. Comparatively, in cases where the first UE115-aidentifies small quantities of sidelink communications performed over the sidelink network, the first UE115-amay be configured to determine that the sidelink network is associated with relatively low network congestion.

In some aspects, the first UE115-amay determine one or more parameters or characteristics associated with transmitting/forwarding time and frequency resource information associated with sidelink communications. In this regard, the first UE115-amay determine one or more parameters or characteristics associated with a reporting configuration210. As such, the first UE115-amay determine the one or more parameters based on receiving the reporting configurations210, monitoring the sidelink network, determining the network congestion, or any combination thereof.

For example, the first UE115-amay be configured to determine a quantity of slots and/or a periodicity for transmitting sidelink messages225including time/frequency resource information associated with sidelink communications based on the determined network congestion. For instance, in cases where the first UE115-adetermines a relatively high network congestion (e.g., frequent sidelink communications), the first UE115-amay determine that there is a relatively high likelihood of sidelink conflicts, and may determine that sidelink messages225including time/frequency resource information should be transmitted more frequently (e.g., higher periodicity) and/or for longer durations of time (e.g., across larger quantities of slots). Comparatively, in cases where the first UE115-adetermines a relatively low network congestion (e.g., infrequent sidelink communications), the first UE115-amay determine that there is a relatively low likelihood of sidelink conflicts, and may determine that sidelink messages225including time/frequency resource information may be transmitted less frequently (e.g., lower periodicity) and/or for shorter durations of time (e.g., across smaller quantities of slots).

Additionally or alternatively, as noted previously herein, parameters for transmitting sidelink messages225including time/frequency resource information (e.g., quantities of slots for transmitting sidelink messages225, periodicity of sidelink messages225) may be indicated via the reporting configurations210.

In some aspects, the first UE115-amay receive SCIs215from the second UE115-b,the third UE115-c,or both. For example, the first UE115-amay receive a first SCI215from the second UE115-b,and a second SCI215-bfrom the third UE115-c.Moreover, the first UE115-amay receive additional SCIs215from additional UEs115of the wireless communications system200. In some cases, the first UE115-amay receive the SCIs215based on monitoring the sidelink network. The first SCIs215-a,215-bmay be received via a PSCCH, a PSSCH, or both.

In some aspects, the SCIs215may reserve sets of sidelink resources for sidelink transmissions220to be performed by (e.g., transmitted or received by) the respective UEs115-b,115-c.For example, the first SCI215-amay reserve a first set of sidelink resources for a first sidelink transmission220-ato be transmitted by the second UE115-b.Similarly, the second SCI215-bmay reserve a second set of sidelink resources for a second sidelink transmission220-bto be transmitted by the third UE115-c.In other words, the first SCI215-amay schedule the first sidelink transmission220-a,and the second SCI215-bmay schedule the second sidelink transmission220-b.Accordingly, the second and third UEs115-b,115-cmay transmit the SCIs215scheduling the respective sidelink transmissions220based on the sidelink network being operated according to a Mode 2, as described previously herein. The second and third UEs115-b,115-cmay transmit the SCIs215-a,215-bvia unicast techniques, multicast/groupcast techniques, broadcast techniques, or any combination thereof.

In cases where the first SCI215-aand the second SCI215-bschedule sidelink transmission220-aand sidelink transmission220-b,respectively, the sets of resources reserved for the respective sidelink transmissions220may be in conflict with one another. For example, a conflict may arise when a first set of sidelink resources reserved by the first SCI215-aand a second set of sidelink resources reserved by the second SCI215-bat least partially overlap in the time domain and the frequency domain.

Upon receiving the SCIs215, the first UE115-amay process (e.g., demodulate, decode) the first SCI215-a,the second SCI215-b,or both. The first UE115-amay process any quantity of SCIs215received from any quantity of UEs115, including the second UE115-band the third UE115-c.In some aspects, processing of the received SCIs215may be associated with a processing time interval of the first UE115-a.The processing time interval may be associated with (e.g., define) a time interval in which the first UE115-ais capable of receiving and decoding the data included within received SCIs215and/or other communications (e.g., PSCCH processing time). Accordingly, the first UE115-amay process (e.g., demodulate, decode) the received SCIs215during (e.g., within) a processing time interval associated with the first UE115-a.In some aspects, a duration of the processing time interval may be based on a processing power or processing capability at the first UE115-a.

In some aspects, a processing time interval associated with the first UE115-amay apply to each received SCI215. In other words, the first UE115-amay process the first SCI215-awithin a first processing time interval for the first SCI215-a,and may process the second SCI215-bwithin a second processing time interval for the second SCI215-b.In this regard, the processing time interval for each respective SCI215may vary depending on the data payload size of the respective SCIs215.

The first UE115-amay detect a conflict between multiple sidelink transmissions220. In some aspects, the conflict may arise from at least partial overlap of multiple sidelink transmissions220which are transmitted, or scheduled to be transmitted, by two or more other UEs115(e.g., second UE115-b,third UE115-c). The first UE115-amay detect the conflict of sidelink communications based on receiving the reporting configurations210, monitoring the sidelink network, determining network congestion, determining parameters of the reporting configuration210, receiving the first SCI215-aand/or the second SCI215-b,processing the received SCIs215, or any combination thereof.

The first UE115-amay be configured to detect a conflict between sidelink communications based on actually receiving conflicting (e.g., colliding) sidelink communications (e.g., sidelink transmissions220), identifying an overlap of reserved sidelink resources which are reserved for future sidelink communications, or both. For example, in some cases, the first UE115-amay detect a conflict by receiving at least two sidelink transmissions220from two or more other UEs115on overlapping time and frequency resources. For instance, the first UE115-amay receive a first sidelink transmission220-afrom the second UE115-band may receive a second sidelink transmission220-bfrom the third UE115-c.In this example, the first UE115-amay detect a conflict based on the first sidelink transmission220-aand the second sidelink transmission220-bbeing received within at least partially overlapping time and frequency resources. In this example, because the first and second sidelink transmissions220are transmitted/received using overlapping time and frequency resources, the sidelink transmissions220may be said to be in conflict due to the fact that the first and second sidelink transmissions220may “collide” with one another at the first UE115-a.Similarly, in the case of a half-duplex conflict, the first UE115-amay detect a conflict based on receiving the first sidelink transmission220-afrom the second UE115-aand the second sidelink transmission220-bfrom the third UE115-cconcurrently (e.g., at the same time).

In additional or other cases, the first UE115-amay detect a conflict based on the reservation of sidelink resources for future sidelink communications. In this regard, the first UE115-amay detect a conflict based on receiving an indication that at least two sidelink transmissions220from other UEs115are scheduled to at least partially overlap in time and frequency resources. For example, as noted previously herein, the first SCI215-areceived from the second UE115-bmay schedule a first sidelink transmission220-ato be transmitted by the second UE115-busing a first set of sidelink resources. Similarly, the second SCI215-breceived from the third UE115-cmay schedule a second sidelink transmission220-bto be transmitted by the third UE115-cusing a second set of sidelink resources. In this example, the first UE115-amay detect a conflict based on determining that the first set of sidelink resources and the second set of sidelink resources at least partially overlap in the time and frequency domain. In other words, the first UE115-amay detect the conflict based on determining that the first sidelink transmission220-aand the second sidelink transmission220-bare scheduled to overlap in time and frequency resources (e.g., collide with one another).

In some aspects, the first UE115-amay generate a sidelink message225-abased on the detected conflict. In some aspects, the sidelink message225-amay include time and frequency resource information associated with SCIs which were received and processed by the first UE115-aprior to detection of the conflict. In this regard, the first UE115-amay generate the sidelink message225-abased on receiving the reporting configurations210, monitoring the sidelink network, determining network congestion, determining parameters of the reporting configuration210, receiving the first SCI215-aand/or second SCI215-b,processing the received SCIs215, detecting the conflict, or any combination thereof.

In some aspects, the first UE115-amay generate the sidelink message225-aincluding time and frequency resource information so that the sidelink message225-amay be distributed to neighboring UEs115(e.g., second UE115-b,third UE115-c) in order to inform neighboring UEs115as to which sidelink resource may or may not be used for future sidelink communications. As such, the first UE115-amay generate the sidelink message225-ain order to increase sidelink network coordination, and reduce or eliminate a likelihood of future conflicts between sidelink communications. For example, the time and frequency resource information included within the generated sidelink message225-amay indicate a first set of sidelink resources which is available for subsequent sidelink communications, and a second set of sidelink resources which is not available for subsequent sidelink communications. In other words, time and frequency resource information may indicate sets of sidelink resources which have already been claimed or reserved by other UEs115for sidelink communications (e.g., sets of sidelink resources which are unavailable for future sidelink communications), and/or sets of sidelink resources which have not been previously claimed or reserved by other UEs115for sidelink communications (e.g., sets of sidelink resources which are available for future sidelink communications).

In some aspects the first UE115-amay generate the sidelink message225-aduring a preparation time interval (e.g., preparation time interval for generating/preparing sidelink messages225). In some aspects, the preparation time interval (e.g., start of the preparation time interval) may be based on detection of the conflict. For example, the preparation time interval for generating the sidelink message225-amay begin upon detection of the conflict. In other words, the first UE115-amay begin generating the sidelink message225-afollowing detection of the conflict.

In some aspects, the time and frequency resource information included within the sidelink message225-amay be based on SCIs215(e.g., first SCI215-a,second SCI215-b) which were received and processed prior to an end of a processing time interval at the first UE115-aand/or processed prior to detection of the conflict. Conversely, the time and frequency resource information may not include resource information associated with SCIs215which were not received and/or processed prior to an end of the processing time interval.

For example, the first UE115-amay receive and process the first SCI215-aand the second SCI215-breceived from the second UE115-band third UE115-c,respectively, prior to an end of a processing time interval and prior to detection of the conflict. Comparatively, the first UE115-amay receive a third SCI215from an additional UE115, but may not have adequate time to process the third SCI215prior to an end of the processing time interval and/or prior to detection of the conflict. In this example, the time and frequency resource information included within the sidelink message225-amay be based on sidelink resource reservations made in the first SCI215-aand the second SCI215-b,but not based on sidelink resource reservations made in the third SCI215. In other words, according to some implementations, SCIs215and other sidelink communications which reserve sidelink resources but are not able to be processed (e.g., decoded) at the first UE115-aprior to an end of the processing time interval and/or prior to detection of the conflict may not be reflected in the time and frequency resource information within the sidelink message225-a.

In some aspects, all or only a portion of data included within SCIs215which were received and processed prior to detection of the conflict may be included within the sidelink message225-a.For example, in some cases, the first UE115-amay include all the data (e.g., all the time/frequency reservation data) included within the first SCI215-aand the second SCI215-bwithin the generated sidelink message225-a.In such cases, the first UE115-amay be configured to generate the sidelink message225-aby packaging the first SCI215-aand the second SCI215-binto a new sidelink message225-awhich will be transmitted (e.g., forwarded, relayed) to other UEs115. In other cases, the first UE115-amay include only a portion of the data included within the first SCI215-aand the second SCI215-bwithin the generated sidelink message225-a.For instance, in some cases, the sidelink message225-amay include decoded data from the first and second SCIs215.

Subsequently, the first UE115-amay transmit the sidelink message225-aincluding the time and frequency resource information. In some aspects, the first UE115-amay transmit the sidelink message225-ato the second UE115-b,the third UE115-c,or both. In additional or alternative aspects, the first UE115-amay transmit the sidelink message225-aincluding the time and frequency resource information to other UEs115(e.g., neighboring UEs115) within the wireless communications system. In this regard, the first UE115-amay be configured to transmit the sidelink message225-avia unicast techniques, groupcast/multicast techniques, broadcast techniques, or any combination thereof.

The first UE115-amay transmit the sidelink message225-abased on receiving the reporting configurations210, monitoring the sidelink network, determining network congestion, determining parameters of the reporting configuration210, receiving the first SCI215-aand/or second SCI215-b,processing the received SCIs215, detecting the conflict, generating the sidelink message225-a,or any combination thereof. For example, the first UE115-amay transmit the sidelink message225-ain accordance with the reporting configuration210. For instance, the reporting configuration210may indicate a set of rules or parameters which indicate what time/frequency resource information is to be included within the sidelink message225-a,a timing for transmitting the sidelink message225-a,or both, and the first UE115-amay transmit the sidelink message225-ain accordance with the rules/parameters associated with the reporting configuration210.

In some aspects, the sidelink message225-amay include an indication of the detected conflict. For example, the sidelink message225-amay include a post-collision indicator, a half-duplex indicator, or other indicator which is associated with the detected conflict. In some aspects, the first UE115-amay transmit the sidelink message225-ain the same slot or TTI in which the conflict was detected. Additionally or alternatively, the first UE115-amay transmit the sidelink message225-ain a TTI which follows the TTI in which the conflict was detected.

As noted previously herein, the first UE115-amay distribute the sidelink message225-ato neighboring UEs115(e.g., second UE115-b,third UE115-c) in order to inform neighboring UEs115as to potential future conflicts and/or to inform the neighboring UEs115which sidelink resource may or may not be used for future sidelink communications. As such, the first UE115-amay transmit the sidelink message225-ain order to increase sidelink network coordination, and reduce or eliminate a likelihood of future conflicts between sidelink communications. For example, the time and frequency resource information included within the generated sidelink message225-amay indicate a first set of sidelink resources which is available for subsequent sidelink communications, and a second set of sidelink resources which is not available for subsequent sidelink communications. In other words, time and frequency resource information included within the sidelink message225-amay indicate sets of sidelink resources which have already been claimed or reserved by other UEs115for sidelink communications (e.g., sets of sidelink resources which are unavailable for future sidelink communications), and/or sets of sidelink resources which have not been previously claimed or reserved by other UEs115for sidelink communications (e.g., sets of sidelink resources which are available for future sidelink communications).

In some cases, the sidelink message225-amay include all of the information included within SCIs215which were received/processed prior to detection of the conflict. For example, in some cases, the first UE115-amay generate and/or transmit the sidelink message225-aby forwarding the first SCI215-aand/or the second SCI215-bwhich was received and processed by the first UE115-aprior to detection of the conflict. In additional or alternative cases, the sidelink message225-amay include only a portion of the information included within SCIs215which were received/processed prior to detection of the conflict.

The sidelink message225-amay be transmitted via a sidelink control channel (e.g., PSCCH), a sidelink shared channel (e.g., PSSCH), a sidelink feedback channel (e.g., PSFCH), or any combination thereof. In some aspects, the sidelink message225-amay be transmitted as its own sidelink communication (e.g., standalone PSCCH message and/or PSSCH message). In additional or alternative cases, the sidelink message225-amay be combined with (e.g., multiplexed with, piggybacked with) other sidelink communications. For example, the first UE115-amay multiplex the time and frequency resource information with another sidelink data message (e.g., multiples time and frequency resource information with a PSSCH transmission).

The first UE115-amay determine to multiplex the time/frequency resource information with other sidelink data messages based on a relative timing of the other sidelink data messages and/or a relative increase in latency of the time/frequency resource information attributable to the multiplexing. For instance, if the next scheduled sidelink data transmission will increase the latency of the time/frequency resource information by more than some latency threshold, the first UE115-amay determine to transmit the sidelink message225-aincluding the time/frequency resource information as a standalone sidelink message225-a.In some cases, the reporting configuration210may indicate whether the sidelink message225-amay be transmitted as a standalone message, or multiplexed with other sidelink communications.

In some implementations, the first UE115-amay generate additional sidelink messages225(e.g., sidelink messages225-b,225-c) based on the conflict detected at540. In some aspects, the additional sidelink messages225may include updated time and frequency resource information associated with SCIs215which were received and processed by the first UE115-aafter to detection of the conflict. In this regard, the first UE115-amay generate the additional sidelink messages225based on receiving the reporting configurations210, monitoring the sidelink network, determining network congestion, determining parameters of the reporting configuration210, receiving the first SCI215-aand/or second SCI215-b,processing the received SCIs215, detecting the conflict, generating/transmitting the sidelink message225-a,or any combination thereof.

In some aspects, the updated time and frequency resource information within the additional sidelink messages225(e.g., sidelink messages225-b,225-c) may be updated relative to the time and frequency information included within the sidelink message225-a.In this regard, the updated time and frequency resource information may be based on SCIs215which were received after detection of the conflict, SCIs received after generation of the sidelink message225-a,SCIs215which were received but not processed prior to detection of the conflict, or both.

For example, as noted previously herein, the first UE115-amay receive and process the first SCI215-aand the second SCI215-bprior to detection of the conflict. Comparatively, the first UE115-amay receive a third SCI215from an additional UE115, but may not have adequate time to process the third SCI215prior to detection of the conflict. In this example, the updated time and frequency resource information included within the additional sidelink messages225(e.g., sidelink messages225-b,225-c) may be based on the third SCI215. By way of another example, the updated time and frequency resource information may be based on SCIs215which were received after detection of the conflict.

In some aspects the first UE115-amay generate (or refrain from generating) the additional sidelink messages225(e.g., sidelink messages225-b,225-c) based on (e.g., in accordance with) the reporting configuration210. For example, a first reporting configuration210may cause the first UE115-ato transmit only a single sidelink message225(e.g., sidelink message225-a) including time and frequency resource information upon detection of a conflict. In this example, the first UE115-amay refrain from generating the additional sidelink messages225based on (e.g., in accordance with) the first reporting configuration210.

Comparatively, other reporting configurations210may cause the first UE115-ato transmit multiple sidelink messages225including time and frequency resource information upon detection of a conflict. For example, a second reporting configuration210may cause the first UE115-ato generate/transmit additional sidelink messages225including updated time/frequency resource information within every slot for a predetermined quantity of slots following detection of a conflict. In such cases, the first UE115-amay generate a second sidelink message225-band/or a third sidelink message225-cin accordance with the second reporting configuration210. In particular, the first UE115-amay generate an additional sidelink message225within every slot for a predetermined quantity of slots following detection of the conflict in accordance with the second reporting configuration210. In this example, each additional sidelink message225(e.g., sidelink messages225-b,225-c) may include updated time/frequency resource information, which has been updated relative to the preceding sidelink message225-a.

By way of another example, a third reporting configuration210may cause the first UE115-ato generate/transmit additional sidelink messages225including updated time/frequency resource information in accordance with a periodicity (e.g., every n slots) for a predetermined quantity of slots following detection of a conflict. In such cases, the first UE115-amay generate the additional sidelink messages225(e.g., sidelink messages225-b,225-c) in accordance with the periodicity for the predetermined quantity of slots associated with the third reporting configuration210. For instance, the third reporting configuration210may cause the first UE115-ato transmit sidelink messages225every other slot (e.g., periodicity of two slots) for a total of four slots (e.g., quantity of slots=4). In such cases, the first UE115-amay generate a second sidelink message225-bfor transmission two slots after detection of the conflict and/or transmission of the first sidelink message225-a.Similarly, continuing with the same example, the first UE115-amay generate a third sidelink message225-cfor transmission four slots after detection of the conflict and/or transmission of the first sidelink message225-a.In this example, each additional sidelink message225(e.g., second sidelink message225-b,third sidelink message225-c) may include updated time/frequency resource information which has been updated relative to the preceding sidelink message225.

Subsequently, the first UE115-amay transmit the additional sidelink messages225(e.g., sidelink messages225-b,225-c) including the updated time and frequency resource information. In some aspects, the first UE115-amay transmit the additional sidelink messages225to the second UE115-b,the third UE115-c,or both. In additional or alternative aspects, the first UE115-amay transmit the additional sidelink messages225including the updated time and frequency resource information to other UEs115(e.g., neighboring UEs115) within the wireless communications system. In this regard, the first UE115-amay be configured to transmit the additional sidelink messages225via unicast techniques, groupcast/multicast techniques, broadcast techniques, or any combination thereof.

The first UE115-amay transmit the additional sidelink messages225(e.g., sidelink messages225-b,225-c) based on receiving the reporting configurations210, monitoring the sidelink network, determining network congestion, determining parameters of the reporting configuration210, receiving the first SCI215-aand/or second SCI215-b,processing the received SCIs215, detecting the conflict, generating/transmitting the sidelink message225-a,generating the additional sidelink messages225, or any combination thereof.

For example, the first UE115-amay transmit the additional sidelink message225(e.g., sidelink messages225-b,225-c) in accordance with the reporting configuration210. For instance, a second reporting configuration210may indicate for the first UE115-ato transmit additional sidelink messages225within every slot for a predetermined quantity of slots, and the first UE115-amay transmit the additional sidelink messages225(e.g., sidelink messages225-b,225-c) in accordance with the second reporting configuration210. By way of another example, a third reporting configuration210may indicate for the first UE115-ato transmit additional sidelink messages225in accordance with a periodicity (e.g., every n slots) for a predetermined quantity of slots, and the first UE115-amay transmit the additional sidelink messages225(e.g., sidelink messages225-b,225-c) in accordance with the third reporting configuration210.

Techniques described herein may improve sidelink network coordination to reduce sidelink conflicts while preventing significant increases in signaling overhead. In particular, techniques described herein may enable the first UE115-ato transmit (e.g., forward, relay) sidelink time/frequency resource information according to one or more reporting configurations210upon identifying a conflict in sidelink communications. By transmitting time/frequency resource information in accordance with reporting configurations210, techniques described herein may reduce or eliminate sidelink conflicts during Mode 2 sidelink operation, thereby improving an efficiency and reliability of sidelink communications.

FIG. 3illustrates an example of a resource configuration300that supports techniques for sidelink resource information forwarding in accordance with aspects of the present disclosure. In some examples, the resource configuration300may implement, or be implemented by, aspects of wireless communications system100, wireless communications system200, or both.

In some aspects, the resource configuration300illustrates various signaling which may be used for forwarding (e.g., relaying) time and frequency resource information associated with sidelink communications. For example, resource configuration300illustrates a set of sidelink resources305which may be used for sidelink communications between wireless devices (e.g., UEs115). In some aspects, a UE115may receive one or more SCIs315from one or more UEs115. In some aspects, each SCI315may reserve a set of sidelink resources for performing a sidelink transmission320. For example, a first SCI315-amay schedule a first sidelink transmission320-aassociated with a first set of sidelink resources. Similarly, a second SCI315-bmay schedule a second sidelink transmission320-bassociated with a second set of sidelink resources, and a third SCI315-cmay schedule a third sidelink transmission320-cassociated with a third set of sidelink resources. In this regard, the first SCI315-a,the second SCI315-b,and the third SCI315-cmay schedule the first sidelink transmission320-a,the second sidelink transmission320-b,and the third sidelink transmission320-c,respectively.

As noted previously herein, processing of the received SCIs315may be associated with a processing time interval345of the UE115. The processing time interval345may be associated with (e.g., define) a time interval in which the UE115is capable of receiving and decoding the data included within received SCIs315and/or other communications (e.g., PSCCH processing time). Accordingly, the UE115may process (e.g., demodulate, decode) the received SCIs315during (e.g., within) a processing time interval345associated with the first UE115-a.In some aspects, a duration of the processing time interval345may be based on a processing power or processing capability at the first UE115-a.Additionally or alternatively, each SCI315may be associated with a different processing time interval345at the UE115. In other words, the processing time interval345illustrated inFIG. 3may be associated with the third SCI315-c,and may be different than processing time intervals345associated with the first and second SCIs315-a,315-b.In this regard, the processing time interval345for each respective SCI315may vary depending on the data payload size of the respective SCI315.

Subsequently, the UE115may detect a conflict335associated with sidelink communications. As noted previously herein, a UE115may be configured to detect a conflict335between sidelink communications based on actually receiving conflicting (e.g., colliding) sidelink communications, identifying an overlap of reserved sidelink resources which are reserved for future sidelink communications, or both. For example, as shown inFIG. 3, the UE115may receive a first sidelink communication325and a second sidelink communication330, where the first sidelink communication325and the second sidelink communication330at least partially overlap in the time and frequency domain. In this regard, the UE115may detect a conflict335based on the first sidelink communication325and the second sidelink communication330overlapping, or colliding with one another.

In some aspects, detection of the conflict335may trigger the UE115to forward/relay time and frequency resource information associated with sidelink communications. As such, upon detecting the conflict, the UE115may generate a sidelink message340based on the detected conflict335. In some aspects the UE115may generate the sidelink message340including time/frequency resource information during a preparation time interval350(e.g., preparation time interval350for generating/preparing sidelink messages340). In some aspects, the preparation time interval350(e.g., start of the preparation time interval350) may be based on detection of the conflict335. For example, the preparation time interval350for generating the sidelink message340may begin upon detection of the conflict335. In other words, the first UE115-amay begin generating the sidelink message340following detection of the conflict335.

In some aspects, the sidelink message340may include time and frequency resource information associated with SCIs315which were received and processed by the UE115prior to detection of the conflict335. In some aspects, the UE115may generate the sidelink message340including time and frequency resource information so that the sidelink message340may be distributed to neighboring UEs115in order to inform neighboring UEs115as to which sidelink resource may or may not be used for future sidelink communications. As such, the UE115may generate the sidelink message340in order to increase sidelink network coordination, and reduce or eliminate a likelihood of future conflict335between sidelink communications. For example, the time and frequency resource information included within the generated sidelink message340may indicate a first set of sidelink resources which is available for subsequent sidelink communications, and a second set of sidelink resources which is not available for subsequent sidelink communications.

In some aspects, the time and frequency resource information included within the sidelink message340may be based on SCIs315which were received and processed prior to an end of a processing time interval345at the first UE115-aand/or processed prior to detection of the conflict335. Conversely, the time and frequency resource information may not include resource information associated with SCIs315which were not received and/or processed prior to an end of the processing time interval.

For example, the UE115may receive and process the first SCI315-aand the second SCI315-bprior to an end of a processing time interval for the respective SCIs315-a,315-band prior to detection of the conflict335. Comparatively, the UE115may not have adequate time to process the third SCI315-cprior to an end of the processing time interval345and/or prior to detection of the conflict335. In this example, the time and frequency resource information included within the sidelink message340may be based on sidelink resource reservations made in the first SCI315-aand the second SCI315-b,but not based on sidelink resource reservations made in the third SCI315-c.As such, the time and frequency resource information included within the sidelink message340may indicate that sidelink resources associated with the first sidelink transmission320-aand the second sidelink transmission320-bare not available for future sidelink communications. Conversely, because the third SCI315-cwas not able to be processed prior to an end of the processing time interval and/or prior to detection of the conflict335, the sidelink message340may not include any information regarding the sidelink resources associated with the third sidelink transmission320-c.

Subsequently, the UE115may transmit the sidelink message340including the time and frequency resource information. The UE115may transmit the sidelink message340based on (e.g., in accordance with) a reporting configuration. For example, in cases where the UE115is configured with a reporting configuration which causes the UE115to transmit a single sidelink message340upon detecting a conflict335, the UE115may transmit the sidelink message340, but no additional sidelink messages340, as shown inFIG. 3.

In some aspects, the UE115may transmit the sidelink message340to the UEs115which performed the first sidelink communication325and/or second sidelink communication330associated with the conflict335. In additional or alternative aspects, the UE115may transmit the sidelink message340including the time and frequency resource information to other UEs115(e.g., neighboring UEs115) within the wireless communications system. In this regard, the UE115may be configured to transmit the sidelink message340via unicast techniques, groupcast/multicast techniques, broadcast techniques, or any combination thereof.

In some aspects, the sidelink message340may include an indication of the detected conflict335. For example, the sidelink message340may include a post-collision indicator, a half-duplex indicator, or other indicator which is associated with the detected conflict335. In some aspects, the UE115may transmit the sidelink message340in the same slot or TTI in which the conflict335was detected.

As noted previously herein, the first UE115-amay distribute the sidelink message340to neighboring UEs115in order to inform neighboring UEs115as to potential future conflicts335and/or to inform the neighboring UEs115which sidelink resource may or may not be used for future sidelink communications. As such, the first UE115-amay transmit the sidelink message340in order to increase sidelink network coordination, and reduce or eliminate a likelihood of future conflicts335between sidelink communications.

FIG. 4illustrates an example of a resource configuration400that supports techniques for sidelink resource information forwarding in accordance with aspects of the present disclosure. In some examples, the resource configuration300may implement, or be implemented by, aspects of wireless communications system100, wireless communications system200, resource configuration300, or any combination thereof.

In some aspects, the resource configuration400illustrates various signaling which may be used for forwarding (e.g., relaying) time and frequency resource information associated with sidelink communications. Moreover, any description associated with the resource configuration300illustrated inFIG. 3may be regarded as applying to resource configuration400, unless noted otherwise herein.

For example, as described with reference to resource configuration300illustrated inFIG. 3, resource configuration400illustrates a set of sidelink resources405which may be used for sidelink communications between wireless devices (e.g., UEs115). The set of sidelink resources405may span across a set of TTIs (e.g., set of slots445). In some aspects, a UE115may receive one or more SCIs415from one or more UEs115. In some aspects, each SCI415may reserve a set of sidelink resources for performing a sidelink transmission420. For example, a first SCI415-amay schedule a first sidelink transmission420-aassociated with a first set of sidelink resources. Similarly, a second SCI415-bmay schedule a second sidelink transmission420-bassociated with a second set of sidelink resources, and a third SCI415-cmay schedule a third sidelink transmission420-cassociated with a third set of sidelink resources. In this regard, the first SCI415-a,the second SCI415-b,and the third SCI415-cmay schedule the first sidelink transmission420-a,the second sidelink transmission420-b,and the third sidelink transmission420-c,respectively.

Subsequently, the UE115may detect a conflict435associated with sidelink communications. As noted previously herein, a UE115may be configured to detect a conflict435between sidelink communications based on actually receiving conflicting (e.g., colliding) sidelink communications, identifying an overlap of reserved sidelink resources which are reserved for future sidelink communications, or both. For example, as shown inFIG. 4, the UE115may receive a first sidelink communication and a second sidelink communication, where the first sidelink communication and the second sidelink communication at least partially overlap in the time and frequency domain. In this regard, the UE115may detect a conflict435based on the first communication and the second communication overlapping, or colliding with one another.

In some aspects, detection of the conflict435may trigger the UE115to forward/relay time and frequency resource information associated with sidelink communications. As such, upon detecting the conflict, the UE115may generate a sidelink message440-abased on the detected conflict435. In some aspects the UE115may generate the sidelink message440-aincluding time/frequency resource information during a preparation time interval450. In some aspects, a start of the preparation time interval450may begin after detection of the conflict435.

In some aspects, the sidelink message440-amay include time and frequency resource information associated with SCIs415which were received and processed by the UE115prior to detection of the conflict435. In some aspects, the UE115may generate the sidelink message440-aincluding time and frequency resource information so that the sidelink message440-amay be distributed to neighboring UEs115in order to inform neighboring UEs115as to which sidelink resource may or may not be used for future sidelink communications. As such, the UE115may generate the sidelink message440-ain order to increase sidelink network coordination, and reduce or eliminate a likelihood of future conflict435between sidelink communications. For example, the time and frequency resource information included within the generated sidelink message440-amay indicate a first set of sidelink resources which is available for subsequent sidelink communications, and a second set of sidelink resources which is not available for subsequent sidelink communications.

In some aspects, the time and frequency resource information included within the sidelink message440-amay be based on SCIs415which were received and processed prior to an end of a processing time interval at the first UE115-aand/or processed prior to detection of the conflict435. Conversely, the time and frequency resource information may not include resource information associated with SCIs415which were not received and/or processed prior to an end of the processing time interval.

For example, the UE115may receive and process the first SCI415-aand the second SCI415-bprior to an end of a processing time interval for the respective SCIs415-a,415-band prior to detection of the conflict435. Comparatively, the UE115may not have adequate time to process the third SCI415-cprior to an end of the processing time interval and/or prior to detection of the conflict435. In this example, the time and frequency resource information included within the sidelink message440-amay be based on sidelink resource reservations made in the first SCI415-aand the second SCI415-b,but not based on sidelink resource reservations made in the third SCI415-c.As such, the time and frequency resource information included within the sidelink message440-amay indicate that sidelink resources associated with the first sidelink transmission420-aand the second sidelink transmission420-bare not available for future sidelink communications. Conversely, because the third SCI415-cwas not able to be processed prior to an end of the processing time interval and/or prior to detection of the conflict435, the sidelink message440-amay not include any information regarding the sidelink resources associated with the third sidelink transmission420-c.

Subsequently, the UE115may transmit the sidelink message440-aincluding the time and frequency resource information. The UE115may transmit the sidelink message440-abased on (e.g., in accordance with) a reporting configuration. The UE115may transmit the sidelink message440-aafter an end of the preparation time interval450. In some aspects, the UE115may transmit the sidelink message440-ato the UEs115which performed and/or scheduled the sidelink communications associated with the conflict435. In additional or alternative aspects, the UE115may transmit the sidelink message440-aincluding the time and frequency resource information to other UEs115(e.g., neighboring UEs115) within the wireless communications system. In this regard, the UE115may be configured to transmit the sidelink message440-avia unicast techniques, groupcast/multicast techniques, broadcast techniques, or any combination thereof.

In some aspects, the sidelink message340may include an indication of the detected conflict435. For example, the sidelink message440-amay include a post-collision indicator, a half-duplex indicator, or other indicator which is associated with the detected conflict435. In some aspects, the UE115may transmit the sidelink message440-ain the same slot or TTI in which the conflict435was detected. For example, as shown inFIG. 4, the conflict435may be detected in a first slot445-a,and the sidelink message440-amay be transited in the first slot445-a.In additional or alternative implementations, the sidelink message440-amay be transmitted in a slot445subsequent to the first slot445-a.For example, if the conflict435is detected at or near the end of the first slot445-a,the UE115may transmit the sidelink message440-ain the second slot445-b.

According to some reporting configurations, the UE115may be configured to generate and transmit additional sidelink messages440(e.g., sidelink messages440-b,440-n) after transmission of the sidelink message440-a.In some aspects, each additional sidelink message440may include updated time and frequency resource information associated with sidelink communications. In this regard, a second sidelink message440-bmay include updated time and frequency resource information which has been updated relative to the first sidelink message440-a,and an nth sidelink message440-nmay include updated time and frequency resource information which has been updated relative to the second sidelink message440-b.

For example, the second sidelink message440-bmay include updated time/frequency resource information which was not included within the first sidelink message440-a.In particular, the second sidelink message440-bmay include time and frequency resource information associated with SCIs415received after detection of the conflict435, SCIs415which were not able to be processed prior to an end of a processing time interval, SCIs415which were not able to be processed prior to detection of the conflict435, or any combination thereof. For instance, in cases where the third SCI415-cwas not able to be processed prior to detection of the conflict435and/or prior to an end of a processing time interval, the time/frequency resource information included within the third SCI415-cmay not be included within the first sidelink message440-a,but may be included within the second sidelink message440-b.By way of another example, the second sidelink message440-bmay include updated time and frequency resource information associated with a fourth SCI415-dand a fifth SCI415-ewhich were received after detection of the conflict435and after transmission of the first sidelink message440-a.Moreover, the nth sidelink message440-nmay include updated time and frequency resource information associated with a sixth SCI415-fwhich was received after detection of the conflict435and after transmission of the second sidelink message440-b.

The UE115may be configured to transmit the additional sidelink messages440based on (e.g., in accordance with) a reporting configuration. In particular, a reporting configuration may be associated with a periodicity455for transmitting sidelink messages440and/or a quantity of slots460across which sidelink messages440should be transmitted.

For instance, a second reporting configuration may configure the UE115to transmit sidelink messages440within every slot445(e.g., periodicity455=one slot445) for five total slots445(e.g., quantity of slots460=five slots445). following detection of a conflict445. In this example, the UE115may transmit additional sidelink messages440including updated time and frequency resource information within every slot445for five total slots445(e.g., second slot445-bthrough a sixth slot445), in accordance with the second reporting configuration.

By way of another example, other reporting configurations may configure the UE115to transmit additional sidelink messages440according to a periodicity455for a defined quantity of slots460. For instance, a third reporting configuration may configure the UE115to transmit additional sidelink messages440in every other slot445(e.g., periodicity455=two slots445) for a total of five slots445(e.g., quantity of slots460=five slots445) following detection of a conflict435. In this example, the UE115may transmit a first additional sidelink message440within a third slot445, and a second additional sidelink message440within a fifth slot445. In this example, each sidelink message440may be separated by one slot (e.g., periodicity455=two slots445), in accordance with the third reporting configuration. The UE115may then refrain from transmitting additional sidelink messages440after the quantity of slots460associated with the third reporting configuration.

FIG. 5illustrates an example of a process flow500that supports techniques for sidelink resource information forwarding in accordance with aspects of the present disclosure. In some examples, process flow500may implement, or be implemented by, aspects of wireless communications systems100, wireless communications systems200, resource configuration300, resource configuration400, or any combination thereof. For example, the process flow500may illustrate a first UE115-ddetecting a conflict of sidelink communications, and transmitting time/frequency resource information for sidelink communications in accordance with a reporting configuration upon detecting the conflict, as described with reference toFIGS. 1-4.

In some cases, process flow500may include a first UE115-d,a second UE115-e,a third UE115-f,and a base station105-b,which may be examples of corresponding devices as described herein. For example, the first UE115-d,the second UE115-e,and the third UE115-fillustrated inFIG. 5may include examples of the first UE115-a,the second UE115-b,and the third UE115-c,respectively, as illustrated inFIG. 2. Similarly, the base station105-billustrated inFIG. 5may include an example of the base station105-aillustrated inFIG. 2.

At505, the first UE115-dmay receive one or more reporting configurations for transmitting sidelink messages including time/frequency resource information for sidelink communications. The first UE115-dmay receive the indication of the one or more reporting configurations from the base station105-b,another wireless device (e.g., another UE115), or both. In some cases, the indication of the one or more reporting configurations may be conveyed via an RRC message, a DCI message, an SSB message, a SIB message, an SCI message, or any combination thereof.

In some aspects, the one or more reporting configurations may include one or more parameters or characteristics for transmitting (e.g., forwarding) sidelink messages including time/frequency resource information for sidelink communications. Parameters associated with a reporting configuration may include, but are not limited to, characteristics or rules for detecting a conflict of sidelink communications, a quantity of slots for transmitting sidelink messages including time/frequency resource information, a periodicity for transmitting sidelink messages including time/frequency resource information, and the like. For instance, a reporting configuration may indicate that the first UE115-dis to transmit time/frequency resource information for a defined quantity of slots after detecting a sidelink conflict, according to a periodicity (e.g., every slot, every other slot) following a detected conflict, or any combination thereof.

Additionally or alternatively, a reporting configuration may be associated with a set of rules or other parameters which may be used by the first UE115-dto determine parameters/characteristics of the respective reporting configuration. In this regard, the first UE115-dmay be configured with one or more reporting configurations which may control when and/or how often the first UE115-dis to transmit (e.g., relay, forward) sidelink messages including time/frequency resource information for sidelink communications.

At510, the first UE115-dmay monitor a sidelink network. The first UE115-dmay monitor the sidelink network at510based on receiving the one or more reporting configurations at505. In some aspects, the first UE115-dmay monitor the sidelink network by decoding (e.g., blindly decoding) sidelink communications performed over the sidelink network. For example, the first UE115-dmay monitor the sidelink network by blindly decoding sidelink communications which are sensed within a PSCCH and/or PSSCH of the sidelink network. The first UE115-dmay monitor the sidelink network in order to identify sidelink resources which have been reserved by the second UE115-eand/or the third UE115-f,to determine characteristics associated with the sidelink network, or any combination thereof.

At515, the first UE115-dmay determine a network congestion of the sidelink network. The first UE115-dmay determine the network congestion at515based on receiving the reporting configurations at505, monitoring the sidelink network at510, or both. For example, in cases where the first UE115-didentifies large quantities of sidelink communications performed over the sidelink network, the first UE115-dmay be configured to determine that the sidelink network is associated with relatively high network congestion. Comparatively, in cases where the first UE115-didentifies small quantities of sidelink communications performed over the sidelink network, the first UE115-dmay be configured to determine that the sidelink network is associated with relatively low network congestion.

At520, the first UE115-dmay determine one or more parameters or characteristics associated with transmitting/forwarding time/frequency resource information associated with sidelink communications. In this regard, the first UE115-dmay determine one or more parameters or characteristics associated with a reporting configuration which was indicated at505. As such, the first UE115-dmay determine the one or more parameters at520based on receiving the reporting configurations at505, monitoring the sidelink network at510, determining the network congestion at520, or any combination thereof.

Additionally or alternatively, as noted previously herein, parameters for transmitting sidelink messages including time/frequency resource information (e.g., quantities of slots for transmitting sidelink messages, periodicity of sidelink messages) may be indicated via the reporting configurations at505.

At525, the first UE115-dmay receive a first SCI from the second UE115-e.In some cases, the first UE115-dmay receive the first SCI at525based on monitoring the sidelink network at510. The first SCI may be received via a PSCCH, a PSSCH, or both. In some aspects, the first SCI may reserve a first set of sidelink resources for a first sidelink communication to be performed at the second UE115-e.In other words, the first SCI may schedule a first sidelink communication. For example, the first SCI may reserve a first set of sidelink resources for transmitting a first sidelink communication (e.g., PSSCH transmission) to the first UE115-d,the third UE115-f,or both. Accordingly, the second UE115-emay transmit the first SCI scheduling the first sidelink communication based on the sidelink network being operated according to a Mode 2, as described previously herein. The second UE115-emay transmit the first SCI via unicast techniques, multicast/groupcast techniques, broadcast techniques, or any combination thereof.

At530, the first UE115-dmay receive a second SCI from the third UE115-f.In some cases, the first UE115-dmay receive the second SCI at530based on monitoring the sidelink network at510. The second SCI may be received via a PSCCH, a PSSCH, or both. In some aspects, the second SCI may reserve a second set of sidelink resources for a second sidelink communication to be performed at the third UE115-f.In other words, the second SCI may schedule a second sidelink communication. For example, the second SCI may reserve a second set of sidelink resources for transmitting a second sidelink communication (e.g., PSSCH transmission) to the first UE115-d,the second UE115-e,or both. Accordingly, the third UE115-fmay transmit the second SCI scheduling the second sidelink communication based on the sidelink network being operated according to a Mode 2, as described previously herein. The third UE115-fmay transmit the first SCI via unicast techniques, multicast/groupcast techniques, broadcast techniques, or any combination thereof.

In cases where the first SCI and the second SCI transmitted at525and530, respectively, schedule sidelink communications, the sets of resources reserved for the respective communications may be in conflict with one another. For example, a conflict may arise when a first set of sidelink resources reserved by the first SCI and a second set of sidelink resources reserved by the second SCI at least partially overlap in the time domain and the frequency domain.

At535, the first UE115-dmay process (e.g., demodulate, decode) the first SCI received at525, the second SCI received at530, or both. The first UE115-dmay process any quantity of SCIs received from any quantity of UEs115, including the second and third UEs115-eand115-f.

In some aspects, processing of the received SCIs may be associated with a processing time interval of the first UE115-d.The processing time interval may be associated with (e.g., define) a time interval in which the first UE115-dis capable of receiving and decoding the data included within received SCIs and/or other communications (e.g., PSCCH processing time). Accordingly, the first UE115-dmay process (e.g., demodulate, decode) the received SCIs during (e.g., within) a processing time interval associated with the first UE115-d.In some aspects, a duration of the processing time interval may be based on a processing power or processing capability at the first UE115-d.

At540, the first UE115-dmay detect a conflict between multiple sidelink transmissions. In some aspects, the conflict may arise from at least partial overlap of multiple sidelink transmissions which are transmitted, or scheduled to be transmitted, by two or more other UEs115(e.g., second UE115-e,third UE115-f). The first UE115-dmay detect the conflict of sidelink communications at540based on receiving the reporting configurations at505, monitoring the sidelink network at510, determining network congestion at515, determining parameters of the reporting configuration at520, receiving the first SCI at525, receiving the second SCI at530, processing the received SCI at535, or any combination thereof.

The first UE115-dmay be configured to detect a conflict between sidelink communications based on actually receiving conflicting (e.g., colliding) sidelink communications, identifying an overlap of reserved sidelink resources which are reserved for future sidelink communications, or both. For example, in some cases, the first UE115-dmay detect a conflict by receiving at least two sidelink transmissions from two or more other UEs115on overlapping time and frequency resources. For instance, the first UE115-dmay receive a first sidelink transmission from the second UE115-eand may receive a second sidelink transmission from the third UE115-f.In this example, the first UE115-dmay detect a conflict based on the first sidelink transmission and the second sidelink transmission being received in at least partially overlapping time and frequency resources. In this example, because the first and second sidelink transmissions are transmitted/received using overlapping time and frequency resources, the sidelink transmissions may be said to be in conflict due to the fact that the first and second sidelink transmissions may “collide” with one another at the first UE115-d.Similarly, in the case of a half-duplex conflict, the first UE115-dmay detect a conflict based on receiving the first sidelink transmission from the second UE115-dand the second sidelink transmission from the third UE115-fconcurrently (e.g., at the same time).

In additional or other cases, the first UE115-dmay detect a conflict based on the reservation of sidelink resources for future sidelink communications. In this regard, the first UE115-dmay detect a conflict based on receiving an indication that at least two sidelink transmissions from other UEs115are scheduled to at least partially overlap in time and frequency resources. For example, as noted previously herein, the first SCI received from the second UE115-eat525may schedule a first sidelink transmission to be transmitted by the second UE115-eusing a first set of sidelink resources. Similarly, the second SCI received from the third UE115-fat530may schedule a second sidelink transmission to be transmitted by the third UE115-fusing a second set of sidelink resources. In this example, the first UE115-dmay detect a conflict based on determining that the first set of sidelink resources and the second set of sidelink resources at least partially overlap in the time and frequency domain. In other words, the first UE115-dmay detect the conflict based on determining that the first sidelink transmission and the second sidelink transmission are scheduled to overlap in time and frequency resources.

At545, the first UE115-dmay generate a sidelink message. In particular, the first UE115-dmay generate a sidelink message based on the conflict detected at540. In some aspects, the sidelink message may include time and frequency resource information associated with SCI which was received and processed by the first UE115-dprior to detection of the conflict at545. In this regard, the first UE115-dmay generate the sidelink message at545based on receiving the reporting configurations at505, monitoring the sidelink network at510, determining network congestion at515, determining parameters of the reporting configuration at520, receiving the first SCI at525, receiving the second SCI at530, processing the received SCI at535, detecting the conflict at540, or any combination thereof.

In some aspects, the first UE115-dmay generate the sidelink message including time and frequency resource information so that the sidelink message may be distributed to neighboring UEs115in order to inform neighboring UEs115as to which sidelink resource may or may not be used for future sidelink communications. As such, the first UE115-dmay generate the sidelink message at545in order to increase sidelink network coordination, and reduce or eliminate a likelihood of future conflicts between sidelink communications. For example, the time and frequency resource information included within the generated sidelink message may indicate a first set of sidelink resources which is available for subsequent sidelink communications, and a second set of sidelink resources which is not available for subsequent sidelink communications. In other words, time and frequency resource information may indicate sets of sidelink resources which have already been claimed or reserved by other UEs115for sidelink communications (e.g., sets of sidelink resources which are unavailable for future sidelink communications), and/or sets of sidelink resources which have not been previously claimed or reserved by other UEs115for sidelink communications (e.g., sets of sidelink resources which are available for future sidelink communications).

In some aspects the first UE115-dmay generate the sidelink message during a preparation time interval (e.g., preparation time interval for generating/preparing sidelink messages). In some aspects, the preparation time interval (e.g., start of the preparation time interval) may be based on detection of the conflict at540. For example, the preparation time interval may begin upon detection of the conflict. In other words, the first UE115-dmay begin generating the sidelink message at545following detection of the conflict at540.

In some aspects, the time and frequency resource information included within the sidelink message may be based on SCIs (e.g., first SCI, second SCI) which were received and processed prior to an end of a processing time interval at the first UE115-d.Conversely, the time and frequency resource information may not include resource information associated with SCIs which were not received and/or processed prior to an end of the processing time interval.

For example, the first UE115-dmay receive and process the first SCI and the second SCI received from the second UE115-eand third UE115-f,respectively, prior to an end of a processing time interval. Comparatively, the first UE115-dmay receive a third SCI from an additional UE115, but may not have adequate time to process the third SCI prior to an end of the processing time interval and/or prior to detection of the conflict at540. In this example, the time and frequency resource information included within the sidelink message may be based on sidelink resource reservations made in the first SCI and the second SCI, but not based on sidelink resource reservations made in the third SCI. In other words, according to some implementations, SCIs and other sidelink communications which reserve sidelink resources but are not able to be processed (e.g., decoded) at the first UE115-dprior to an end of the processing time interval and/or prior to detection of the conflict may not be reflected in the time and frequency resource information within the sidelink message.

In some aspects, all or only a portion of data included within SCIs which were received and processed prior to detection of the conflict may be included within the sidelink message. For example, in some cases, the first UE115-dmay include all the data (e.g., all the time/frequency reservation data) included within the first SCI and the second SCI within the generated sidelink message. In such cases, the first UE115-dmay be configured to generate the sidelink message at545by packaging the first SCI and the second SCI into a new sidelink message which will be transmitted (e.g., forwarded, relayed) to other UEs115. In other cases, the first UE115-dmay include only a portion of the data included within the first SCI and the second SCI within the generated sidelink message. For instance, in some cases, the sidelink message may include decoded data from the first and second SCIs.

At550, the first UE115-dmay transmit the sidelink message including the time and frequency resource information. In some aspects, the first UE115-dmay transmit the sidelink message to the second UE115-e,the third UE115-f,or both. In additional or alternative aspects, the first UE115-dmay transmit the sidelink message including the time and frequency resource information to other UEs115(e.g., neighboring UEs115) within the wireless communications system. In this regard, the first UE115-dmay be configured to transmit the sidelink message via unicast techniques, groupcast/multicast techniques, broadcast techniques, or any combination thereof.

The first UE115-dmay transmit the sidelink message at550based on receiving the reporting configurations at505, monitoring the sidelink network at510, determining network congestion at515, determining parameters of the reporting configuration at520, receiving the first SCI at525, receiving the second SCI at530, processing the received SCI at535, detecting the conflict at540, generating the sidelink message at545, or any combination thereof. For example, the first UE115-dmay transmit the sidelink message in accordance with the reporting configuration received at505. For instance, the reporting configuration may indicate a set of rules or parameters which indicate what time/frequency resource information is to be included within the sidelink message, a timing for transmitting the sidelink message, or both, and the first UE115-dmay transmit the sidelink message in accordance with the rules/parameters associated with the reporting configuration.

In some aspects, the sidelink message may include an indication of the detected conflict. For example, the sidelink message may include a post-collision indicator, a half-duplex indicator, or other indicator which is associated with the detected conflict. In some aspects, the first UE115-dmay transmit the sidelink message in the same slot or TTI in which the conflict was detected. Additionally or alternatively, the first UE115-dmay transmit the sidelink message in a TTI which follows the TTI in which the conflict was detected.

As noted previously herein, the first UE115-dmay distribute the sidelink message to neighboring UEs115(e.g., second UE115-e,third UE115-f) in order to inform neighboring UEs115as to potential future conflicts and/or to inform the neighboring UEs115which sidelink resource may or may not be used for future sidelink communications. As such, the first UE115-dmay transmit the sidelink message at550in order to increase sidelink network coordination, and reduce or eliminate a likelihood of future conflicts between sidelink communications. For example, the time and frequency resource information included within the generated sidelink message may indicate a first set of sidelink resources which is available for subsequent sidelink communications, and a second set of sidelink resources which is not available for subsequent sidelink communications. In other words, time and frequency resource information included within the sidelink message may indicate sets of sidelink resources which have already been claimed or reserved by other UEs115for sidelink communications (e.g., sets of sidelink resources which are unavailable for future sidelink communications), and/or sets of sidelink resources which have not been previously claimed or reserved by other UEs115for sidelink communications (e.g., sets of sidelink resources which are available for future sidelink communications).

In some cases, the sidelink message may include all of the information included within SCIs which were received/processed prior to detection of the conflict. For example, in some cases, the first UE115-dmay generate and/or transmit the sidelink message by forwarding the first SCI and/or the second SCI which was received and processed by the first UE115-dprior to detection of the conflict. In additional or alternative cases, the sidelink message may include only a portion of the information included within SCIs which were received/processed prior to detection of the conflict.

The sidelink message may be transmitted via a sidelink control channel (e.g., PSCCH), a sidelink shared channel (e.g., PSSCH), a sidelink feedback channel (e.g., PSFCH), or any combination thereof. In some aspects, the sidelink message may be transmitted as its own sidelink communication (e.g., standalone PSCCH message and/or PSSCH message). In additional or alternative cases, the sidelink message may be combined with (e.g., multiplexed with, piggybacked with) other sidelink communications. For example, the first UE115-dmay multiplex the time and frequency resource information with another sidelink data message (e.g., multiples time and frequency resource information with a PSSCH transmission).

The first UE115-dmay determine to multiplex the time/frequency resource information with other sidelink data messages based on a relative timing of the other sidelink data messages and/or a relative increase in latency of the time/frequency resource information attributable to the multiplexing. For instance, if the next scheduled sidelink data transmission will increase the latency of the time/frequency resource information by more than some latency threshold, the first UE115-dmay determine to transmit the sidelink message including the time/frequency resource information as a standalone sidelink message. In some cases, the reporting configuration may indicate whether the sidelink message may be transmitted as a standalone message, or multiplexed with other sidelink communications.

At555, the first UE115-dmay generate additional sidelink messages. In particular, the first UE115-dmay generate additional sidelink messages based on the conflict detected at540. In some aspects, the additional sidelink messages may include updated time and frequency resource information associated with SCIs which were received and processed by the first UE115-dafter to detection of the conflict at545. In this regard, the first UE115-dmay generate the additional sidelink messages at555based on receiving the reporting configurations at505, monitoring the sidelink network at510, determining network congestion at515, determining parameters of the reporting configuration at520, receiving the first SCI at525, receiving the second SCI at530, processing the received SCI at535, detecting the conflict at540, generating the sidelink message at545, transmitting the sidelink message at550, or any combination thereof.

In some aspects, the updated time and frequency resource information within the additional sidelink messages generated at555may be updated relative to the time and frequency information included within the sidelink message generated and transmitted at545and550. In this regard, the updated time and frequency resource information may be based on SCIs which were received after generation of the sidelink message at545, SCIs which were received but not processed prior to detection of the conflict at540, or both.

For example, as noted previously herein, the first UE115-dmay receive and process the first SCI and the second SCI received from the second UE115-eand third UE115-f,respectively, prior to detection of the conflict at540. Comparatively, the first UE115-dmay receive a third SCI from an additional UE115, but may not have adequate time to process the third SCI prior to detection of the conflict at540. In this example, the updated time and frequency resource information included within the additional sidelink messages may be based on the third SCI. By way of another example, the updated time and frequency resource information may be based on SCIs which were received after detection of the conflict at540.

In some aspects the first UE115-dmay generate (or refrain from generating) the additional sidelink messages based on (e.g., in accordance with) the reporting configuration. For example, a first reporting configuration may cause the first UE115-dto transmit only a single sidelink message including time and frequency resource information upon detection of a conflict. In this example, the first UE115-dmay refrain from generating the additional sidelink messages based on (e.g., in accordance with) the first reporting configuration.

Comparatively, other reporting configurations may cause the first UE115-dto transmit multiple sidelink messages including time and frequency resource information upon detection of a conflict. For example, a second reporting configuration may cause the first UE115-dto generate/transmit additional sidelink messages including updated time/frequency resource information within every slot for a predetermined quantity of slots following detection of a conflict. In such cases, the first UE115-dmay generate the additional sidelink messages at555in accordance with the second reporting configuration. In particular, the first UE115-dmay generate the additional sidelink messages at555within every slot for a predetermined quantity of slots following detection of the conflict in accordance with the second reporting configuration. In this example, each additional sidelink message may include updated time/frequency resource information, which has been updated relative to the preceding sidelink message.

By way of another example, a third reporting configuration may cause the first UE115-dto generate/transmit additional sidelink messages including updated time/frequency resource information in accordance with a periodicity (e.g., every n slots) for a predetermined quantity of slots following detection of a conflict. In such cases, the first UE115-dmay generate the additional sidelink messages at555in accordance with the periodicity for the predetermined quantity of slots associated with the third reporting configuration. For instance, the third reporting configuration may cause the first UE115-dto transmit sidelink messages every other slot (e.g., periodicity of two slots) for a total of six slots (e.g., quantity of slots=6). In such cases, the first UE115-dmay generate a first additional sidelink message two slots after detection of the conflict and/or transmission of the first sidelink message. Similarly, continuing with the same example, the first UE115-dmay generate a second additional sidelink message and a third additional sidelink message four and six slots after detection of the conflict and/or transmission of the first sidelink message, respectively. In this example, each additional sidelink message may include updated time/frequency resource information which has been updated relative to the preceding sidelink message.

At560, the first UE115-dmay transmit the additional sidelink messages including the updated time and frequency resource information. In some aspects, the first UE115-dmay transmit the additional sidelink message to the second UE115-e,the third UE115-f,or both. In additional or alternative aspects, the first UE115-dmay transmit the additional sidelink messages including the updated time and frequency resource information to other UEs115(e.g., neighboring UEs115) within the wireless communications system. In this regard, the first UE115-dmay be configured to transmit the additional sidelink messages via unicast techniques, groupcast/multicast techniques, broadcast techniques, or any combination thereof.

The first UE115-dmay transmit the additional sidelink messages at550based on receiving the reporting configurations at505, monitoring the sidelink network at510, determining network congestion at515, determining parameters of the reporting configuration at520, receiving the first SCI at525, receiving the second SCI at530, processing the received SCI at535, detecting the conflict at540, generating the sidelink message at545, transmitting the sidelink message at550, generating the additional sidelink messages at555, or any combination thereof.

For example, the first UE115-dmay transmit the sidelink message in accordance with the reporting configuration received at505. For instance, a second reporting configuration may indicate for the first UE115-dto transmit additional sidelink messages within every slot for a predetermined quantity of slots, and the first UE115-dmay transmit the additional sidelink messages in accordance with the second reporting configuration. By way of another example, a third reporting configuration may indicate for the first UE115-dto transmit additional sidelink messages in accordance with a periodicity (e.g., every n slots) for a predetermined quantity of slots, and the first UE115-dmay transmit the additional sidelink messages in accordance with the third reporting configuration.

Techniques described herein may improve sidelink network coordination to reduce sidelink conflicts while preventing significant increases in signaling overhead. In particular, techniques described herein may enable the first UE115-dto transmit (e.g., forward, relay) sidelink time/frequency resource information according to one or more reporting configurations upon identifying a conflict in sidelink communications. By transmitting time/frequency resource information in accordance with reporting configurations, techniques described herein may reduce or eliminate sidelink conflicts during Mode 2 sidelink operation, thereby improving an efficiency and reliability of sidelink communications.

FIG. 6shows a block diagram600of a device605that supports techniques for sidelink resource information forwarding in accordance with aspects of the present disclosure. The device605may be an example of aspects of a base station105or a UE115as described herein. The device605may include a receiver610, a transmitter615, and a communications manager620. The device605may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses).

The communications manager620, the receiver610, the transmitter615, or various combinations thereof or various components thereof may be examples of means for performing various aspects of techniques for sidelink resource information forwarding as described herein. For example, the communications manager620, the receiver610, the transmitter615, or various combinations or components thereof may support a method for performing one or more of the functions described herein.

In some examples, the communications manager620may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the receiver610, the transmitter615, or both. For example, the communications manager620may receive information from the receiver610, send information to the transmitter615, or be integrated in combination with the receiver610, the transmitter615, or both to receive information, transmit information, or perform various other operations as described herein.

The communications manager620may support wireless communication at a first UE in accordance with examples as disclosed herein. For example, the communications manager620may be configured as or otherwise support a means for triggering a sidelink message to one or more UE of a set of multiple other UEs. The communications manager620may be configured as or otherwise support a means for generating the sidelink message based on the triggering, the sidelink message including time and frequency resource information associated with sidelink control information received and processed by the first UE. The communications manager620may be configured as or otherwise support a means for multiplexing the sidelink message with a sidelink data message. The communications manager620may be configured as or otherwise support a means for transmitting the sidelink message multiplexed with the sidelink data message to the one or more UE of the set of multiple other UEs. In another example, the communications manager620may be configured as or otherwise support a means for detecting a conflict arising from at least partial overlap of sidelink communications transmitted or scheduled to be transmitted by a set of multiple other UEs. The communications manager620may be configured as or otherwise support a means for generating a sidelink message based on the detected conflict, the sidelink message including time and frequency resource information associated with SCI received and processed by the first UE prior to detection of the conflict. The communications manager620may be configured as or otherwise support a means for transmitting the sidelink message to one or more of the set of multiple other UEs.

By including or configuring the communications manager620in accordance with examples as described herein, the device605(e.g., a processor controlling or otherwise coupled to the receiver610, the transmitter615, the communications manager620, or a combination thereof) may support techniques for improved sidelink network coordination to reduce sidelink conflicts while preventing significant increases in signaling overhead. In particular, techniques described herein may enable UEs115to transmit (e.g., forward, relay) sidelink time/frequency resource information according to one or more reporting configurations upon identifying a conflict in sidelink communications. By transmitting time/frequency resource information in accordance with reporting configurations, techniques described herein may reduce or eliminate sidelink conflicts during Mode 2 sidelink operation, thereby improving an efficiency and reliability of sidelink communications.

FIG. 7shows a block diagram700of a device705that supports techniques for sidelink resource information forwarding in accordance with aspects of the present disclosure. The device705may be an example of aspects of a device605, a base station105, or a UE115as described herein. The device705may include a receiver710, a transmitter715, and a communications manager720. The device705may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses).

The device705, or various components thereof, may be an example of means for performing various aspects of techniques for sidelink resource information forwarding as described herein. For example, the communications manager720may include a sidelink conflict manager725, a sidelink message manager730, a sidelink transmitting manager735, or any combination thereof. The communications manager720may be an example of aspects of a communications manager620as described herein. In some examples, the communications manager720, or various components thereof, may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise in cooperation with the receiver710, the transmitter715, or both. For example, the communications manager720may receive information from the receiver710, send information to the transmitter715, or be integrated in combination with the receiver710, the transmitter715, or both to receive information, transmit information, or perform various other operations as described herein.

The communications manager720may support wireless communication at a first UE in accordance with examples as disclosed herein. The sidelink conflict manager725may be configured as or otherwise support a means for triggering a sidelink message to one or more UE of a set of multiple other UEs. The sidelink message manager730may be configured as or otherwise support a means for generating the sidelink message based on the triggering, the sidelink message including time and frequency resource information associated with sidelink control information received and processed by the first UE. The sidelink message manager730may be configured as or otherwise support a means for multiplexing the sidelink message with a sidelink data message. The sidelink transmitting manager735may be configured as or otherwise support a means for transmitting the sidelink message multiplexed with the sidelink data message to the one or more UE of the set of multiple other UEs. In some examples, the sidelink conflict manager725may be configured as or otherwise support a means for detecting a conflict arising from at least partial overlap of sidelink communications transmitted or scheduled to be transmitted by a set of multiple other UEs. The sidelink message manager730may be configured as or otherwise support a means for generating a sidelink message based on the detected conflict, the sidelink message including time and frequency resource information associated with SCI received and processed by the first UE prior to detection of the conflict. The sidelink transmitting manager735may be configured as or otherwise support a means for transmitting the sidelink message to one or more of the set of multiple other UEs.

FIG. 8shows a block diagram800of a communications manager820that supports techniques for sidelink resource information forwarding in accordance with aspects of the present disclosure. The communications manager820may be an example of aspects of a communications manager620, a communications manager720, or both, as described herein. The communications manager820, or various components thereof, may be an example of means for performing various aspects of techniques for sidelink resource information forwarding as described herein. For example, the communications manager820may include a sidelink conflict manager825, a sidelink message manager830, a sidelink transmitting manager835, a sidelink receiving manager840, a reporting configuration manager845, or any combination thereof. Each of these components may communicate, directly or indirectly, with one another (e.g., via one or more buses).

The communications manager820may support wireless communication at a first UE in accordance with examples as disclosed herein. The sidelink conflict manager825may be configured as or otherwise support a means for triggering a sidelink message to one or more UE of a set of multiple other UEs. The sidelink message manager830may be configured as or otherwise support a means for generating the sidelink message based on the triggering, the sidelink message including time and frequency resource information associated with sidelink control information received and processed by the first UE. In some examples, the sidelink message manager830may be configured as or otherwise support a means for multiplexing the sidelink message with a sidelink data message. The sidelink transmitting manager835may be configured as or otherwise support a means for transmitting the sidelink message multiplexed with the sidelink data message to the one or more UE of the set of multiple other UEs. In some examples, the sidelink conflict manager825may be configured as or otherwise support a means for detecting a conflict arising from at least partial overlap of sidelink communications transmitted or scheduled to be transmitted by a set of multiple other UEs. The sidelink message manager830may be configured as or otherwise support a means for generating a sidelink message based on the detected conflict, the sidelink message including time and frequency resource information associated with SCI received and processed by the first UE prior to detection of the conflict. The sidelink transmitting manager835may be configured as or otherwise support a means for transmitting the sidelink message to one or more of the set of multiple other UEs.

In some examples, to support triggering the sidelink message, the sidelink conflict manager825may be configured as or otherwise support a means for detecting a conflict arising from at least partial overlap of sidelink communications transmitted or scheduled to be transmitted by the set of multiple other UEs. In some examples, to support detecting the conflict, the sidelink conflict manager825may be configured as or otherwise support a means for receiving at least two sidelink transmissions from the set of multiple other UEs on overlapping time and frequency resources. In some examples, to support detecting the conflict, the sidelink conflict manager825may be configured as or otherwise support a means for receiving an indication that at least two sidelink transmissions from the set of multiple other UEs are scheduled to overlap in time and frequency resources. In some examples, to support detecting the conflict, the sidelink conflict manager825may be configured as or otherwise support a means for receiving at least two sidelink transmissions from the set of multiple other UEs at a same time.

In some examples, the sidelink message multiplexed with the sidelink data message is transmitted in a first slot, and the sidelink message manager830may be configured as or otherwise support a means for generating additional sidelink messages based on the triggering the sidelink message, the additional sidelink messages including updated time and frequency resource information associated with additional sidelink control information received and processed by the first UE after the triggering the sidelink message. In some examples, the sidelink message multiplexed with the sidelink data message is transmitted in a first slot, and the sidelink transmitting manager835may be configured as or otherwise support a means for transmitting the additional sidelink messages according to a periodicity for a quantity of slots. In some examples, the periodicity is every slot during the quantity of slots.

In some examples, the sidelink receiving manager845may be configured as or otherwise support a means for receiving an indication of the quantity of slots, the periodicity, or both, where the first UE transmits the additional sidelink messages based on receiving the indication of the quantity of slots, the periodicity, or both.

In some examples, the reporting configuration manager840may be configured as or otherwise support a means for determining the quantity of slots, the periodicity, or both, based on network congestion, where the first UE transmits the additional sidelink messages based on determining the quantity of slots, the periodicity, or both.

In some examples, the time and frequency resource information included in the sidelink message is based on the sidelink control information received and processed by the first UE prior to an end of a processing time interval.

In some examples, the sidelink transmitting manager835may be configured as or otherwise support a means for transmitting, via the sidelink message, an indication of the triggering the sidelink message.

In some examples, the sidelink message manager830may be configured as or otherwise support a means for generating the sidelink message during a preparation time interval, where a start of the preparation time interval is based on the triggering the sidelink message.

In some examples, the reporting configuration manager840may be configured as or otherwise support a means for receiving a reporting configuration for transmission of the sidelink message, where the sidelink message multiplexed with the sidelink data message is transmitted in accordance with the reporting configuration.

In some examples, to support generating the sidelink message, the sidelink message manager830may be configured as or otherwise support a means for preparing the sidelink control information received and processed by the first UE for forwarding.

In some examples, the time and frequency resource information associated with the sidelink control information indicates a first set of sidelink resources which is available for subsequent sidelink communications, a second set of sidelink resources which is not available for subsequent sidelink communications, or both.

In some examples, the sidelink message multiplexed with the sidelink data message is transmitted via a sidelink control channel, a sidelink shared channel, a sidelink feedback channel, or any combination thereof.

In some examples, the sidelink message is transmitted in a first slot, and the sidelink message manager830may be configured as or otherwise support a means for generating additional sidelink messages based on the detected conflict, the additional sidelink messages including updated time and frequency resource information associated with additional SCI received and processed by the first UE after detection of the conflict. In some examples, the sidelink message is transmitted in a first slot, and the sidelink transmitting manager835may be configured as or otherwise support a means for transmitting the additional sidelink messages according to a periodicity for a quantity of slots. In some examples, the periodicity is every slot during the quantity of slots.

In some examples, the reporting configuration manager845may be configured as or otherwise support a means for receiving an indication of the quantity of slots, the periodicity, or both, where the first UE transmits the additional sidelink messages based on receiving the indication of the quantity of slots, the periodicity, or both. In some examples, the reporting configuration manager845may be configured as or otherwise support a means for determining the quantity of slots, the periodicity, or both, based on network congestion, where the first UE transmits the additional sidelink messages based on determining the quantity of slots, the periodicity, or both. In some examples, the time and frequency resource information included in the sidelink message is based on the additional SCI received and processed by the first UE prior to an end of a processing time interval.

In some examples, the sidelink transmitting manager835may be configured as or otherwise support a means for transmitting, via the sidelink message, an indication of the detected conflict.

In some examples, the sidelink message manager830may be configured as or otherwise support a means for generating the sidelink message during a preparation time interval, where a start of the preparation time interval is based on detection of the conflict.

In some examples, to support detecting the conflict, the sidelink receiving manager840may be configured as or otherwise support a means for receiving at least two sidelink transmissions from the set of multiple other UEs on overlapping time and frequency resources. In some examples, to support detecting the conflict, the sidelink receiving manager840may be configured as or otherwise support a means for receiving an indication that at least two sidelink transmissions from the set of multiple other UEs are scheduled to overlap in time and frequency resources. In some examples, to support detecting the conflict, the sidelink receiving manager840may be configured as or otherwise support a means for receiving at least two sidelink transmissions from the set of multiple other UEs at the same time.

In some examples, the reporting configuration manager845may be configured as or otherwise support a means for receiving a reporting configuration for transmission of the sidelink message, where the sidelink message is transmitted in accordance with the reporting configuration.

In some examples, to support generating the sidelink message, transmitting the sidelink message, or both, the sidelink transmitting manager835may be configured as or otherwise support a means for forwarding the SCI received and processed by the first UE. In some examples, the time and frequency resource information associated with the SCI indicates a first set of sidelink resources which is available for subsequent sidelink communications, a second set of sidelink resources which is not available for subsequent sidelink communications, or both.

In some examples, to support generating the sidelink message, the sidelink transmitting manager835may be configured as or otherwise support a means for multiplexing the time and frequency resource information with a sidelink data message, where transmitting the sidelink message is based on the multiplexing. In some examples, the sidelink message is transmitted via a sidelink control channel, a sidelink shared channel, a sidelink feedback channel, or any combination thereof.

FIG. 9shows a diagram of a system900including a device905that supports techniques for sidelink resource information forwarding in accordance with aspects of the present disclosure. The device905may be an example of or include the components of a device605, a device705, a base station105, or a UE115as described herein. The device905may communicate wirelessly with one or more base stations105, UEs115, or any combination thereof. The device905may include components for bi-directional voice and data communications including components for transmitting and receiving communications, such as a communications manager920, a network communications manager910, a transceiver915, an antenna925, a memory930, code935, a processor940, and an inter-station communications manager945. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus950).

The network communications manager910may manage communications with a core network130(e.g., via one or more wired backhaul links). For example, the network communications manager910may manage the transfer of data communications for client devices, such as one or more UEs115.

The communications manager920may support wireless communication at a first UE in accordance with examples as disclosed herein. For example, the communications manager920may be configured as or otherwise support a means for triggering a sidelink message to one or more UE of a set of multiple other UEs. The communications manager920may be configured as or otherwise support a means for generating the sidelink message based on the triggering, the sidelink message including time and frequency resource information associated with sidelink control information received and processed by the first UE. The communications manager920may be configured as or otherwise support a means for multiplexing the sidelink message with a sidelink data message. The communications manager920may be configured as or otherwise support a means for transmitting the sidelink message multiplexed with the sidelink data message to the one or more UE of the set of multiple other UEs. In another example, the communications manager920may be configured as or otherwise support a means for detecting a conflict arising from at least partial overlap of sidelink communications transmitted or scheduled to be transmitted by a set of multiple other UEs. The communications manager920may be configured as or otherwise support a means for generating a sidelink message based on the detected conflict, the sidelink message including time and frequency resource information associated with SCI received and processed by the first UE prior to detection of the conflict. The communications manager920may be configured as or otherwise support a means for transmitting the sidelink message to one or more of the set of multiple other UEs.

By including or configuring the communications manager920in accordance with examples as described herein, the device905may support techniques for improved sidelink network coordination to reduce sidelink conflicts while preventing significant increases in signaling overhead. In particular, techniques described herein may enable UEs115to transmit (e.g., forward, relay) sidelink time/frequency resource information according to one or more reporting configurations upon identifying a conflict in sidelink communications. By transmitting time/frequency resource information in accordance with reporting configurations, techniques described herein may reduce or eliminate sidelink conflicts during Mode 2 sidelink operation, thereby improving an efficiency and reliability of sidelink communications.

At1005, the method may include triggering a sidelink message to one or more UE of a set of multiple other UEs. The operations of1005may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1005may be performed by a sidelink conflict manager825as described with reference toFIG. 8.

At1010, the method may include generating the sidelink message based on the triggering, the sidelink message including time and frequency resource information associated with sidelink control information received and processed by the first UE. The operations of1010may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1010may be performed by a sidelink message manager830as described with reference toFIG. 8.

At1015, the method may include multiplexing the sidelink message with a sidelink data message. The operations of1015may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1015may be performed by a sidelink message manager830as described with reference toFIG. 8.

At1020, the method may include transmitting the sidelink message multiplexed with the sidelink data message to the one or more UE of the set of multiple other UEs. The operations of1020may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1020may be performed by a sidelink transmitting manager835as described with reference toFIG. 8.

FIG. 11shows a flowchart illustrating a method1000that supports techniques for sidelink resource information forwarding in accordance with aspects of the present disclosure. The operations of the method1100may be implemented by a UE115or its components as described herein. For example, the operations of the method1100may be performed by a UE115as described with reference toFIGS. 1 through 9. In some examples, a UE115may execute a set of instructions to control the functional elements of the UE115to perform the described functions. Additionally or alternatively, the UE115may perform aspects of the described functions using special-purpose hardware.

At1105, the method may include detecting a conflict arising from at least partial overlap of sidelink communications transmitted or scheduled to be transmitted by a set of multiple other UEs. The operations of1105may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1105may be performed by a sidelink conflict manager825as described with reference toFIG. 8.

At1110, the method may include generating a sidelink message based on the detected conflict, the sidelink message including time and frequency resource information associated with SCI received and processed by the first UE prior to detection of the conflict. The operations of1110may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1110may be performed by a sidelink message manager830as described with reference toFIG. 8.

At1115, the method may include transmitting the sidelink message to one or more of the set of multiple other UEs. The operations of1115may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1115may be performed by a sidelink transmitting manager835as described with reference toFIG. 8.

FIG. 12shows a flowchart illustrating a method1200that supports techniques for sidelink resource information forwarding in accordance with aspects of the present disclosure. The operations of the method1200may be implemented by a UE115or its components as described herein. For example, the operations of the method1200may be performed by a UE115as described with reference toFIGS. 1 through 9. In some examples, a UE115may execute a set of instructions to control the functional elements of the UE115to perform the described functions. Additionally or alternatively, the UE115may perform aspects of the described functions using special-purpose hardware.

At1205, the method may include detecting a conflict arising from at least partial overlap of sidelink communications transmitted or scheduled to be transmitted by a set of multiple other UEs. The operations of1205may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1205may be performed by a sidelink conflict manager825as described with reference toFIG. 8.

At1210, the method may include generating a sidelink message based on the detected conflict, the sidelink message including time and frequency resource information associated with SCI received and processed by the first UE prior to detection of the conflict. The operations of1210may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1210may be performed by a sidelink message manager830as described with reference toFIG. 8.

At1215, the method may include transmitting the sidelink message to one or more of the set of multiple other UEs. The operations of1215may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1215may be performed by a sidelink transmitting manager835as described with reference toFIG. 8.

At1220, the method may include generating additional sidelink messages based on the detected conflict, the additional sidelink messages including updated time and frequency resource information associated with additional SCI received and processed by the first UE after detection of the conflict. The operations of1220may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1220may be performed by a sidelink message manager830as described with reference toFIG. 8.

At1225, the method may include transmitting the additional sidelink messages according to a periodicity for a quantity of slots. The operations of1225may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1225may be performed by a sidelink transmitting manager835as described with reference toFIG. 8.

FIG. 13shows a flowchart illustrating a method1300that supports techniques for sidelink resource information forwarding in accordance with aspects of the present disclosure. The operations of the method1300may be implemented by a UE115or its components as described herein. For example, the operations of the method1300may be performed by a UE115as described with reference toFIGS. 1 through 9. In some examples, a base station may execute a set of instructions to control the functional elements of the UE115to perform the described functions. Additionally or alternatively, the UE115may perform aspects of the described functions using special-purpose hardware.

At1305, the method may include receiving a reporting configuration for transmission of the sidelink message, where the sidelink message is transmitted in accordance with the reporting configuration. The operations of1305may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1305may be performed by a reporting configuration manager845as described with reference toFIG. 8.

At1310, the method may include detecting a conflict arising from at least partial overlap of sidelink communications transmitted or scheduled to be transmitted by a set of multiple other UEs. The operations of1310may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1310may be performed by a sidelink conflict manager825as described with reference toFIG. 8.

At1315, the method may include generating a sidelink message based on the detected conflict, the sidelink message including time and frequency resource information associated with SCI received and processed by the first UE prior to detection of the conflict. The operations of1315may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1315may be performed by a sidelink message manager830as described with reference toFIG. 8.

At1320, the method may include transmitting the sidelink message to one or more of the set of multiple other UEs. The operations of1320may be performed in accordance with examples as disclosed herein. In some examples, aspects of the operations of1320may be performed by a sidelink transmitting manager835as described with reference toFIG. 8.

Aspect 1: A method for wireless communication at a first UE, comprising: triggering a sidelink message to one or more UE of a plurality of other UEs; generating the sidelink message based at least in part on the triggering, the sidelink message including time and frequency resource information associated with sidelink control information received and processed by the first UE; multiplexing the sidelink message with a sidelink data message; and transmitting the sidelink message multiplexed with the sidelink data message to the one or more UE of the plurality of other UEs.

Aspect 2: The method of aspect 1, wherein the triggering the sidelink message comprises: detecting a conflict arising from at least partial overlap of sidelink communications transmitted or scheduled to be transmitted by the plurality of other UEs.

Aspect 3: The method of aspect 2, wherein detecting the conflict comprises: receiving at least two sidelink transmissions from the plurality of other UEs on overlapping time and frequency resources.

Aspect 4: The method of any of aspects 2 through 3, wherein detecting the conflict comprises: receiving an indication that at least two sidelink transmissions from the plurality of other UEs are scheduled to overlap in time and frequency resources.

Aspect 5: The method of any of aspects 2 through 4, wherein detecting the conflict comprises: receiving at least two sidelink transmissions from the plurality of other UEs at a same time.

Aspect 6: The method of any of aspects 1 through 5, wherein the sidelink message multiplexed with the sidelink data message is transmitted in a first slot, the method further comprising: generating additional sidelink messages based at least in part on the triggering the sidelink message, the additional sidelink messages including updated time and frequency resource information associated with additional sidelink control information received and processed by the first UE after the triggering the sidelink message; and transmitting the additional sidelink messages according to a periodicity for a quantity of slots.

Aspect 7: The method of aspect 6, wherein the periodicity is every slot during the quantity of slots.

Aspect 8: The method of any of aspects 6 through 7, further comprising: receiving an indication of the quantity of slots, the periodicity, or both, wherein the first UE transmits the additional sidelink messages based at least in part on receiving the indication of the quantity of slots, the periodicity, or both.

Aspect 9: The method of any of aspects 6 through 8, further comprising: determining the quantity of slots, the periodicity, or both, based at least in part on network congestion, wherein the first UE transmits the additional sidelink messages based at least in part on determining the quantity of slots, the periodicity, or both.

Aspect 10: The method of any of aspects 1 through 9, wherein the time and frequency resource information included in the sidelink message is based at least in part on the sidelink control information received and processed by the first UE prior to an end of a processing time interval.

Aspect 11: The method of any of aspects 1 through 10, further comprising: transmitting, via the sidelink message, an indication of the triggering the sidelink message.

Aspect 12: The method of any of aspects 1 through 11, further comprising: generating the sidelink message during a preparation time interval, wherein a start of the preparation time interval is based at least in part on the triggering the sidelink message.

Aspect 13: The method of any of aspects 1 through 12, further comprising: receiving a reporting configuration for transmission of the sidelink message, wherein the sidelink message multiplexed with the sidelink data message is transmitted in accordance with the reporting configuration.

Aspect 14: The method of any of aspects 1 through 13, wherein generating the sidelink message comprises: preparing the sidelink control information received and processed by the first UE for forwarding.

Aspect 15: The method of any of aspects 1 through 14, wherein the time and frequency resource information associated with the sidelink control information indicates a first set of sidelink resources which is available for subsequent sidelink communications, a second set of sidelink resources which is not available for subsequent sidelink communications, or both.

Aspect 16: The method of any of aspects 1 through 15, wherein the sidelink message multiplexed with the sidelink data message is transmitted via a sidelink control channel, a sidelink shared channel, a sidelink feedback channel, or any combination thereof.

Aspect 17: A method for wireless communication at a first UE, comprising: detecting a conflict arising from at least partial overlap of sidelink communications transmitted or scheduled to be transmitted by a plurality of other UEs; generating a sidelink message based at least in part on the detected conflict, the sidelink message including time and frequency resource information associated with SCI received and processed by the first UE prior to detection of the conflict; and transmitting the sidelink message to one or more of the plurality of other UEs.

Aspect 18: The method of aspect 17, wherein the sidelink message is transmitted in a first slot, the method further comprising: generating additional sidelink messages based at least in part on the detected conflict, the additional sidelink messages including updated time and frequency resource information associated with additional SCI received and processed by the first UE after detection of the conflict; and transmitting the additional sidelink messages according to a periodicity for a quantity of slots.

Aspect 19: The method of aspect 18, wherein the periodicity is every slot during the quantity of slots.

Aspect 20: The method of any of aspects 18 through 19, further comprising: receiving an indication of the quantity of slots, the periodicity, or both, wherein the first UE transmits the additional sidelink messages based at least in part on receiving the indication of the quantity of slots, the periodicity, or both.

Aspect 21: The method of any of aspects 18 through 20, further comprising: determining the quantity of slots, the periodicity, or both, based at least in part on network congestion, wherein the first UE transmits the additional sidelink messages based at least in part on determining the quantity of slots, the periodicity, or both.

Aspect 22: The method of any of aspects 17 through 21, wherein the time and frequency resource information included in the sidelink message is based at least in part on the additional SCI received and processed by the first UE prior to an end of a processing time interval.

Aspect 23: The method of any of aspects 17 through 22, further comprising: transmitting, via the sidelink message, an indication of the detected conflict.

Aspect 24: The method of any of aspects 17 through 23, further comprising: generating the sidelink message during a preparation time interval, wherein a start of the preparation time interval is based at least in part on detection of the conflict.

Aspect 25: The method of any of aspects 17 through 24, wherein detecting the conflict comprises: receiving at least two sidelink transmissions from the plurality of other UEs on overlapping time and frequency resources.

Aspect 26: The method of any of aspects 17 through 25, wherein detecting the conflict comprises: receiving an indication that at least two sidelink transmissions from the plurality of other UEs are scheduled to overlap in time and frequency resources.

Aspect 27: The method of any of aspects 17 through 26, wherein detecting the conflict comprises: receiving at least two sidelink transmissions from the plurality of other UEs at the same time.

Aspect 28: The method of any of aspects 17 through 27, further comprising: receiving a reporting configuration for transmission of the sidelink message, wherein the sidelink message is transmitted in accordance with the reporting configuration.

Aspect 29: The method of any of aspects 17 through 28, wherein generating the sidelink message, transmitting the sidelink message, or both, comprises: forwarding the SCI received and processed by the first UE.

Aspect 30: The method of any of aspects 17 through 29, wherein the time and frequency resource information associated with the SCI indicates a first set of sidelink resources which is available for subsequent sidelink communications, a second set of sidelink resources which is not available for subsequent sidelink communications, or both.

Aspect 31: The method of any of aspects 17 through 30, wherein generating the sidelink message comprises: multiplexing the time and frequency resource information with a sidelink data message, wherein transmitting the sidelink message is based at least in part on the multiplexing.

Aspect 32: The method of any of aspects 17 through 31, wherein the sidelink message is transmitted via a sidelink control channel, a sidelink shared channel, a sidelink feedback channel, or any combination thereof.

Aspect 36: An apparatus for wireless communication at a first UE, comprising at least one means for performing a method of any of aspects 17 through 32.