Patent Description:
For example, deployment of <NUM> NR in unlicensed spectrum may be desired to improve or replace existing wireless networks.

<NPL>") discusses details regarding the NR-Unlicensed frame structure changes due to LBT, possible alteration on an LBT interval and gNB/UE medium sharing.

<NPL>)" discusses - similar as 3GPP Draft R1-<NUM> - details regarding the NR-Unlicensed frame structure changes due to LBT, possible alteration on an LBT interval and gNB/UE medium sharing.

Embodiments of the invention are claimed in the dependent claims.

A <NUM> NR system operating in unlicensed spectrum may share the unlicensed spectrum with other communications systems. A listen-before-talk (LBT) procedure may be used to prevent transmissions from interfering with ongoing communications of other systems. As discussed in further detail below, <NUM> NR may utilize frame structures to facilitate efficient communications. In order to implement frame structures in unlicensed spectrum, a base station (e.g., a gNB) may occupy a channel for a period of time by transmitting in a downlink direction and sharing the channel with user equipment (UE) for uplink transmissions. The period of time utilized by the base station may be referred to as a channel occupancy time (COT).

A UE performs uplink transmissions either inside the COT or outside the COT. Uplink transmissions are subject to LBT procedures. LBT procedures (e.g., LBT periods and/or energy detection thresholds) are different inside and outside of the COT. Since the base station has reserved the channel during the COT, if the UE transmits using configured resources during the COT, the UE generally experiences higher LBT success rates (e.g., energy below an energy detection threshold) inside the COT. The higher success rate applies when the same LBT type can be used for transmissions inside and outside of the COT. Control signaling such as physical random access channel (PRACH) transmissions and scheduling requests (SR) occurs either inside or outside the COT.

Uplink control signaling may be sensitive to latency. In particular, failure of an LBT procedure for control signaling may result in latency for an uplink transmission due to periodicity of uplink control signaling opportunities. One technique to reduce latency for control signaling is to reduce the periodicity of the uplink control signaling opportunities. Using a smaller periodicity for control signaling, however, may incur a larger overhead as resources are reserved for the control signaling. For example, supported periodicities for release <NUM> of <NUM> NR is listed in Table <NUM>.

In an aspect, the claimed embodiment provides for multiple configurations of uplink control signaling opportunities. Generally, a higher density of control signaling opportunities is utilized outside of a COT than inside the COT. Accordingly, a UE transmits PRACH or SR outside of the COT, where LBT failure is more likely or more frequent, and overhead for uplink control signaling is reduced within the COT. The higher density of control signaling opportunities refers to a number of configured signaling opportunities per unit of time. The number of control signaling opportunities is increased by configuring a smaller periodicity or by configuring a greater number of SR or PRACH resources per opportunity.

A UE determines which configuration of uplink control resources to use based on whether the base station has entered a COT that is shared with the UE. For example, the base station may provide COT information in a group based physical downlink control channel (PDCCH) or a UE specific PDCCH when starting the COT. The COT information indicates the uplink control signaling configuration. In an aspect, a PDCCH may indicate an uplink control signaling configuration without specific reference to COT information.

The wireless communications system (also referred to as a wireless wide area network (WWAN)) includes base stations <NUM>, UEs <NUM>, an Evolved Packet Core (EPC) <NUM>, and a <NUM> Core (5GC) <NUM>.

The base stations <NUM> configured for <NUM> LTE (collectively referred to as Evolved Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (E-UTRAN)) may interface with the EPC <NUM> through backhaul links <NUM> (e.g., S1 interface). The base stations <NUM> configured for <NUM> NR (collectively referred to as Next Generation RAN (NG-RAN)) may interface with 5GC <NUM> through backhaul links <NUM>. The base stations <NUM> may communicate directly or indirectly (e.g., through the EPC <NUM> or 5GC <NUM>) with each other over backhaul links <NUM> (e.g., X2 interface).

There maybe overlapping geographic coverage areas <NUM>. A network that includes both small cell and macro cells may be known as a heterogeneous network. Allocation of carriers may be asymmetric with respect to DL and UL (e.g., more or less carriers may be allocated for DL than for UL).

A base station <NUM>, whether a small cell <NUM>' or a large cell (e.g., macro base station), may include an eNB, gNodeB (gNB), or other type of base station. The gNB <NUM> may utilize beamforming <NUM> with the UE <NUM> to compensate for the extremely high path loss and short range.

The 5GC <NUM> may include an Access and Mobility Management Function (AMF) <NUM>, other AMFs <NUM>, a Session Management Function (SMF) <NUM>, and a User Plane Function (UPF) <NUM>. The AMF <NUM> is the control node that processes the signaling between the UEs <NUM> and the 5GC <NUM>.

The base station <NUM> provides an access point to the EPC <NUM> or 5GC <NUM> for a UE <NUM>.

Referring again to <FIG>, in certain aspects, the UE <NUM> may include an uplink signaling component <NUM> for determining an uplink signaling configuration and transmitting uplink signaling according to the determined uplink signaling configuration. For example, the uplink signaling component <NUM> may be included in or implemented by the modem <NUM> of UE <NUM> or by one or more processors of the UE <NUM>. Additionally, one or more base stations <NUM> may include a channel occupancy component <NUM> for occupying a channel in unlicensed or shared spectrum. The channel occupancy component <NUM> may also indicate when the base station <NUM> is occupying the channel and/or indicate an uplink signaling configuration to use.

Turning now to <FIG> aspects are depicted with reference to one or more components and one or more methods that may perform the actions or operations described herein, where aspects in dashed line may be optional. Although the operations described below in <FIG> and <FIG> are presented in a particular order and/or as being performed by an example component, it should be understood that the ordering of the actions and the components performing the actions may be varied, depending on the implementation. Moreover, it should be understood that the following actions, functions, and/or described components may be performed by a specially-programmed processor, a processor executing specially-programmed software or computer-readable media, or by any other combination of a hardware component and/or a software component capable of performing the described actions or functions.

The subcarrier spacing may be equal to <NUM>µ * <NUM> kKz, where µ is the numerology <NUM> to <NUM>.

Referring to <FIG>, one example of an implementation of UE <NUM> may include a variety of components, some of which have already been described above and are described further herein, including components such as one or more processors <NUM> and memory <NUM> and transceiver <NUM> in communication via one or more buses <NUM>, which may operate in conjunction with modem <NUM> and/or uplink signaling component <NUM> to enable one or more of the functions described herein related to uplink control signaling inside or outside of a COT.

In an aspect, the one or more processors <NUM> can include a modem <NUM> and/or can be part of the modem <NUM> that uses one or more modem processors. Thus, the various functions related to uplink signaling component <NUM> may be included in modem <NUM> and/or processors <NUM> and, in an aspect, can be executed by a single processor, while in other aspects, different ones of the functions may be executed by a combination of two or more different processors. For example, in an aspect, the one or more processors <NUM> may include any one or any combination of a modem processor, or a baseband processor, or a digital signal processor, or a transmit processor, or a receiver processor, or a transceiver processor associated with transceiver <NUM>. In other aspects, some of the features of the one or more processors <NUM> and/or modem <NUM> associated with uplink signaling component <NUM> may be performed by transceiver <NUM>.

Also, memory <NUM> may be configured to store data used herein and/or local versions of applications <NUM> or uplink signaling component <NUM> and/or one or more of its subcomponents being executed by at least one processor <NUM>. Memory <NUM> can include any type of computer-readable medium usable by a computer or at least one processor <NUM>, such as random access memory (RAM), read only memory (ROM), tapes, magnetic discs, optical discs, volatile memory, non-volatile memory, and any combination thereof. In an aspect, for example, memory <NUM> may be a non-transitory computer-readable storage medium that stores one or more computer-executable codes defining uplink signaling component <NUM> and/or one or more of its subcomponents, and/or data associated therewith, when UE <NUM> is operating at least one processor <NUM> to execute uplink signaling component <NUM> and/or one or more of its subcomponents.

Receiver <NUM> may include hardware, firmware, and/or software code executable by a processor for receiving data, the code comprising instructions and being stored in a memory (e.g., computer-readable medium). Receiver <NUM> maybe, for example, a radio frequency (RF) receiver. Additionally, receiver <NUM> may process such received signals, and also may obtain measurements of the signals, such as, but not limited to, Ec/Io, signal-to-noise ratio (SNR), reference signal received power (RSRP), received signal strength indicator (RSSI), etc. Transmitter <NUM> may include hardware, firmware, and/or software code executable by a processor for transmitting data, the code comprising instructions and being stored in a memory (e.g., computer-readable medium). A suitable example of transmitter <NUM> may include, but is not limited to, an RF transmitter.

In an aspect, uplink signaling component <NUM> may optionally include a configuration component <NUM> for determining at least two uplink signaling configurations. Each uplink signaling configuration may indicate a periodicity of configured uplink resources. The uplink signaling configuration may also indicate a number of uplink resources per uplink signaling opportunity. For example, a first uplink signaling configuration may be for uplink signaling outside a COT and a second uplink signaling configuration may be for uplink signaling inside a COT. Generally, the first uplink signaling configuration may have a greater density of uplink signaling opportunities. For example, the first uplink signaling configuration may have a smaller periodicity or a larger number of resources per uplink signaling opportunity than the second uplink signaling configuration. The uplink signaling configurations may be signaled by the network, for example, as radio resource control (RRC) layer signaling. The configuration component <NUM> may receive the signaled uplink signaling configurations and configure the uplink signaling component <NUM> with the received configurations.

In an aspect, uplink signaling component <NUM> may optionally include a COT component <NUM> for determining whether the base station <NUM> has entered a COT that is shared with the UE <NUM>. For example, the COT component <NUM> may control the receiver <NUM> to receive COT information transmitted by the base station <NUM>. The COT information may be included in a group based PDCCH such as a SFI or common PDCCH. The COT information may indicate that the base station <NUM> has entered a COT. The COT information may also include a duration of the COT. In an aspect, the COT component <NUM> may detect a medium reservation waveform. For example, a Wi-Fi preamble may include a short training field (STF), long training field (LTF), and/or a duration. A base station <NUM> may use a medium reservation waveform to occupy the channel. The COT component <NUM> may identify a medium reservation waveform and determine that the base station <NUM> has entered a COT.

The uplink signaling component <NUM> may optionally include a resource component <NUM> for determining one or more resources for an uplink transmission. The resource component <NUM> may determine the resources based on whether the base station <NUM> is in a COT. For example, the resource component <NUM> may determine the resources according to a first uplink signaling configuration when the base station <NUM> is outside of a COT and determine the resources according to the second uplink signaling configuration when the base station <NUM> is inside of the COT.

In an aspect, the uplink signaling component <NUM> and/or resource component <NUM> may include an LBT component <NUM> for performing an LBT procedure prior to a transmission. For example, the LBT component <NUM> may perform an LBT procedure on resources selected by the resource component <NUM> to determine whether the transmission should occur. For instance, the LBT component <NUM> may sense the selected resource for an LBT duration prior to the transmission and determine whether sensed energy exceeds an energy detection threshold. If the sensed energy exceeds the energy detection threshold, the LBT component <NUM> may block the transmission, and the transmission may be considered an LBT failure. If the sensed energy is less than the energy detection threshold, the LBT component <NUM> may allow the transmission to occur.

In an aspect, the uplink signaling component <NUM> and/or resource component <NUM> may include a priority component <NUM>. Transmissions may be associated with logical channels based on a type or source of data to be transmitted. Each logical channel may be associated with a priority. Uplink signaling resources may also be associated with a priority corresponding to a logical channel. The resource component <NUM> may utilize the priority component <NUM> to select uplink signaling resources that correspond to a priority of a logical channel associated with the transmission. In an aspect, when a transmission experiences an LBT failure, the priority component <NUM> may identify another uplink signaling resource associated with a lower priority that may be used for the transmission. Accordingly, a high priority transmission may utilize lower priority resources if a transmission attempt fails. In contrast, a transmission associated with a lower priority logical channel may not utilize higher priority resources in the event of an LBT failure.

In an aspect, uplink signaling component <NUM> may optionally include a transmitting component <NUM> for transmitting uplink signaling such as an SR or PRACH on selected configured resources. The transmitting component <NUM> may control the transmitter <NUM> to transmit the uplink signaling. In an aspect, the transmitting component may transmit different content for the uplink signaling depending on whether the transmission occurs during the COT. Transmissions within the COT maybe more reliable (e.g., less likelihood of LBT failure), so the transmitting component <NUM> may generally include additional content because resources may not be needed for multiple transmission opportunities. Additionally, the resources may be reserved by the base station and may not be used for a downlink transmission. For example, a SR transmission outside of the COT may only include an indication that the UE has data to transmit to the base station. In contrast, an SR transmission inside the COT may include a payload such as a buffer status report (BSR). As another example, a PRACH transmission outside of the COT may include only a preamble. In contrast, a PRACH transmission inside of the COT may include the preamble and a payload such as a UE identifier, C-RNTI, or small message.

Referring to <FIG>, one example of an implementation of a base station <NUM> may include a variety of components, some of which have already been described above, but including components such as one or more processors <NUM> and memory <NUM> and transceiver <NUM> in communication via one or more buses <NUM>, which may operate in conjunction with modem <NUM> and channel occupancy component <NUM> to indicate to one or more UEs <NUM> whether the base station <NUM> is occupying a channel and sharing the COT with the UEs <NUM>, or indicate an uplink signaling configuration for the UEs <NUM> to use.

The transceiver <NUM>, receiver <NUM>, transmitter <NUM>, one or more processors <NUM>, memory <NUM>, applications <NUM>, buses <NUM>, RF front end <NUM>, LNAs <NUM>, switches <NUM>, filters <NUM>, PAs <NUM>, and one or more antennas <NUM> may be the same as or similar to the corresponding components of the UE <NUM>, as described above, but configured or otherwise programmed for base station operations as opposed to UE operations.

<FIG> is a resource diagram showing a first example <NUM> of different uplink signaling configurations based on a COT <NUM>. A first uplink signaling configuration may be used outside of the COT <NUM>. The first uplink signaling configuration may have a periodicity of <NUM> symbols. One resource may be used for uplink signaling in each period. In this example, each slot may include <NUM> symbols, so an uplink signaling opportunity may occur twice each slot. In contrast, a second uplink configuration may be used inside of the COT <NUM>. Again, one resource may be used for uplink signaling per period. The second uplink signaling configuration may have a periodicity of <NUM> slots. Accordingly, an uplink signaling opportunity may occur once every <NUM> slots or <NUM> symbols. Therefore, the first uplink signaling configuration may have a greater density of uplink signaling opportunities.

<FIG> is another resource diagram showing a second example <NUM> of different uplink signaling configurations based on a COT <NUM>. A first uplink signaling configuration may be used outside of the COT <NUM>. The first uplink signaling configuration may have a periodicity of <NUM> slot. Three resources (e.g., combinations of resource blocks and OFDM symbols) may be used for uplink signaling during each period, so there may be three uplink signaling opportunities per slot. In contrast, a second uplink configuration may be used inside of the COT <NUM>. The second uplink signaling configuration may have a periodicity of <NUM> slots. One resource may be used for uplink signaling per period. Accordingly, an uplink signaling opportunity may occur once every <NUM> slots. Again, the first uplink signaling configuration may have a greater density of uplink signaling opportunities.

<FIG> is a flowchart of a method <NUM> of wireless communication. The method may be performed by an UE (e.g., the UE <NUM>) including an uplink signaling component <NUM> in communication with a base station <NUM>, which may include a channel occupancy component <NUM>.

At block <NUM>, the method <NUM> may include receiving a configuration of two or more uplink signaling configurations. In an aspect, for example, the UE <NUM>, the processor <NUM>, the RX processor <NUM>, and/or the controller/processor <NUM> may execute the uplink signaling component <NUM> and/or the configuration component <NUM> to receive the configuration of two or more uplink signaling configurations. For instance, the configuration component <NUM> may receive the two or more uplink signaling configurations via RRC signaling. Accordingly, the UE <NUM>, the processor <NUM>, the RX processor <NUM>, and/or the controller/processor <NUM> executing the uplink signaling component <NUM> and/or the configuration component <NUM> may provide means for receiving a configuration of two or more uplink signaling configurations.

At block <NUM>, the method <NUM> may include determining that a UE has an uplink transmission for a base station. In an aspect, for example, the UE <NUM>, the processor <NUM>, the TX processor <NUM>, and/or the controller/processor <NUM> may execute the uplink signaling component <NUM> to determine that the UE <NUM> has an uplink transmission for a base station <NUM>. For example, the uplink signaling component <NUM> may check a status of an uplink buffer or receive an indication of the uplink transmission from an application <NUM>. Accordingly, the UE <NUM>, the processor <NUM>, the TX processor <NUM>, and/or the controller/processor <NUM> executing the uplink signaling component <NUM> may provide means for determining that a UE has an uplink transmission for a base station.

At block <NUM>, the method <NUM> may include determining whether the base station has entered a channel occupancy time that is shared with the UE. In an aspect, for example, the UE <NUM>, the processor <NUM>, the RX processor <NUM>, and/or the controller/processor <NUM> may execute the uplink signaling component <NUM> and/or the COT component <NUM> to determine whether the base station <NUM> has entered the COT <NUM> that is shared with the UE <NUM>. For example, in block <NUM>, determining whether the base station has entered the COT <NUM> may include receiving a physical downlink control channel (PDCCH) from the base station indicating the channel occupancy time. For example, the COT component <NUM> may decode a PDCCH to determine whether the PDCCH indicates a channel occupancy time. The COT component <NUM> may also determine whether the base station <NUM> is sharing the COT by configuring uplink resources for the UE <NUM>. In an aspect, the PDCCH may be a group PDCCH such as an SFI or a common PDCCH. In another aspect, a base station <NUM> may indicate a COT by transmitting a medium reservation waveform. Accordingly, the UE <NUM>, the processor <NUM>, the RX processor <NUM>, and/or the controller/processor <NUM> executing the uplink signaling component <NUM> and/or the COT component <NUM> may provide means for determining whether the base station has entered a channel occupancy time that is shared with the UE.

At block <NUM>, the method <NUM> may include determining configured random access or scheduling request transmission resources based on the channel occupancy time. In an aspect, for example, the UE <NUM>, the processor <NUM>, the RX processor <NUM>, and/or the controller/processor <NUM> may execute the uplink signaling component <NUM> and/or the resource component <NUM> to determine configured random access or scheduling request transmission resources based on the COT <NUM>. For example, if the base station <NUM> is outside of the COT <NUM> (e.g., no COT indicated by the base station), the resource component <NUM> may determine the configured random access or scheduling request transmission resources based on a first uplink signaling configuration. In contrast, if the base station <NUM> is inside of the COT <NUM>, the resource component <NUM> may determine the configured random access or scheduling request transmission resources based on a second uplink signaling configuration, or based on resources indicated within the PDCCH indicating the COT <NUM>. In an aspect, where the transmission is associated with a logical channel and/or priority, the resource component <NUM> may select available random access or scheduling request transmission resources with a corresponding priority. Accordingly, the UE <NUM>, the processor <NUM>, the RX processor <NUM>, and/or the controller/processor <NUM> executing the uplink signaling component <NUM> and/or the resource component <NUM> may provide means for determining configured random access or scheduling request transmission resources based on the channel occupancy time.

At block <NUM>, the method <NUM> may include performing a listen before talk procedure prior to transmitting. In an aspect, for example, the UE <NUM>, the processor <NUM>, the RX processor <NUM>, and/or the controller/processor <NUM> may execute the uplink signaling component <NUM> and/or the LBT component <NUM> to perform the listen before talk procedure prior to transmitting. For example, the listen before talk procedure may include sensing the configured resources, determining an energy level, and comparing the energy level to an energy detection threshold to determine whether the configured resources are occupied. If the resources are unoccupied (e.g., the detected energy is less than the energy detection threshold, the method <NUM> may proceed to block <NUM>. In sub-block <NUM>, performing the listen before talk procedure may include determining that the selected resources are unavailable. For example, the LBT component <NUM> may determine that the detected energy level exceeds the energy detection threshold and determine that the selected resources are occupied. Accordingly, the UE <NUM>, the processor <NUM>, the RX processor <NUM>, and/or the controller/processor <NUM> executing the uplink signaling component <NUM> and/or the LBT component <NUM> may provide means for performing a listen before talk procedure prior to transmitting. The method <NUM> may proceed to block <NUM> in response to determining that the selected resources are occupied.

At block <NUM>, the method <NUM> may include transmitting a random access message or the scheduling request on selected configured resources. In an aspect, for example, the UE <NUM>, the processor <NUM>, the TX processor <NUM>, and/or the controller/processor <NUM> may execute the uplink signaling component <NUM> and/or the transmitting component <NUM> to transmit the random access message or the scheduling request on the selected configured resources. In an aspect, a SR transmission outside of the COT may only include an indication that the UE has data to transmit to the base station. In contrast, an SR transmission inside the COT may include a payload such as a BSR. As another example, a PRACH transmission outside of the COT may include only a preamble. In contrast, a PRACH transmission inside of the COT may include the preamble and a payload such as a UE identifier, C-RNTI, or small message. Accordingly, the UE <NUM>, the processor <NUM>, the TX processor <NUM>, and/or the controller/processor <NUM> executing the uplink signaling component <NUM> and/or the transmitting component <NUM> may provide means for transmitting a random access message or the scheduling request on selected configured resources.

In block <NUM>, the method <NUM> may include transmitting the scheduling request on resources for a lower priority logical channel. In an aspect, for example, the UE <NUM>, the processor <NUM>, the TX processor <NUM>, and/or the controller/processor <NUM> may execute the uplink signaling component <NUM> and/or the transmitting component <NUM> to transmit the scheduling request on resources for a lower priority logical channel. That is, the resources for the lower priority logical channel may be preempted for a higher priority logical channel. If no lower priority logical channel resources are available, however, the transmitting component <NUM> may wait for a next transmission opportunity for transmission at the priority level. Accordingly, the UE <NUM>, the processor <NUM>, the TX processor <NUM>, and/or the controller/processor <NUM> executing the uplink signaling component <NUM> and/or the transmitting component <NUM> may provide means for transmitting the scheduling request on resources for a lower priority logical channel.

<FIG> is a flowchart of a method <NUM> of wireless communication. The method may be performed by a base station (e.g., the base station <NUM>) including a channel occupancy component <NUM> in communication with a UE <NUM>, which may include an uplink signaling component <NUM>.

In block <NUM>, the method <NUM> may include signaling at least a first uplink signaling configuration to a UE, the first uplink signaling configuration for use outside of a channel occupancy time (COT). In an aspect, for example, the base station <NUM>, the processor <NUM>, the TX processor <NUM>, and/or the controller/processor <NUM> may execute the channel occupancy component <NUM> to control the transmitter <NUM> to signal at least a first uplink signaling configuration to a UE <NUM>, the first uplink signaling configuration for use outside of the COT <NUM>. For example, the channel occupancy component <NUM> may signal the uplink signaling configuration using RRC signaling.

In block <NUM>, the method <NUM> may include transmitting a downlink control channel indicating that a base station has entered the COT to be shared with the UE. In an aspect, the base station <NUM>, the processor <NUM>, the TX processor <NUM>, and/or the controller/processor <NUM> may execute the channel occupancy component <NUM> to control the transmitter <NUM> to transmit a downlink control channel indicating that a base station has entered the COT <NUM> to be shared with the UE <NUM>. The COT may be associated with a second uplink signaling configuration. A density of transmission opportunities may be greater outside of the shared channel occupancy time than within the shared channel occupancy time.

In block <NUM>, the method <NUM> may include receiving a scheduling request or random access message from the UE according to one of the first uplink signaling configuration or the second uplink signaling configuration based on whether the base station is in the COT at a time of the scheduling request or random access message. In an aspect, for example, the base station <NUM>, the processor <NUM>, the RX processor <NUM>, and/or the controller/processor <NUM> may execute the channel occupancy component <NUM> to control the receiver <NUM> to receive a scheduling request or random access message from the UE <NUM> according to one of the first uplink signaling configuration or the second uplink signaling configuration based on whether the base station is in the COT <NUM> at a time of the scheduling request or random access message.

The base station <NUM> may be an example of the base station <NUM> including a channel occupancy component <NUM>. The UE <NUM> may be an example of the UE <NUM> including the uplink signaling component <NUM>.

Each spatial stream may then be provided to a different antenna <NUM> via a separate transmitter 918TX. Each transmitter 918TX may modulate an RF carrier with a respective spatial stream for transmission.

At the UE <NUM>, each receiver 954RX receives a signal through its respective antenna <NUM>. Each receiver 954RX recovers information modulated onto an RF carrier and provides the information to the receive (RX) processor <NUM>.

The spatial streams generated by the TX processor <NUM> may be provided to different antenna <NUM> via separate transmitters 954TX. Each transmitter 954TX may modulate an RF carrier with a respective spatial stream for transmission.

Each receiver 918RX receives a signal through its respective antenna <NUM>. Each receiver 918RX recovers information modulated onto an RF carrier and provides the information to a RX processor <NUM>.

Claim 1:
A method (<NUM>) of wireless communication, comprising:
determining (<NUM>) that a user equipment, UE, has an uplink transmission for a base station;
determining (<NUM>) whether the base station has entered a channel occupancy time that is shared with the UE;
determining (<NUM>) configured random access or scheduling request transmission resources based on the channel occupancy time, wherein a density of transmission opportunities is greater outside of the shared channel occupancy time than within the shared channel occupancy time; wherein the density of transmission opportunities refers to a number of configured transmission opportunities per unit of time;
performing (<NUM>) a listen before talk, LBT, procedure, wherein an energy detection threshold for the listen before talk procedure is lesser outside the channel occupancy time than inside of the channel occupancy time; and
transmitting (<NUM>) a random access message or a scheduling request on selected configured resources.