Techniques and apparatuses for positioning reference signal (PRS) management

A user equipment (UE) may determine that a channel, such as a downlink channel or an uplink channel, and a positioning reference signal (PRS) occasion are scheduled for a common set of resources, such as a common frequency, a common time, and/or the like. This may result in the UE being unable to receive the PRS and/or process the PRS as a result of receiving the channel. In some aspects, the UE may determine that a PRS collides with a channel, and may perform a collision response action, such as dropping at least a portion of the channel, based at least in part on determining that the PRS occasion collides with the channel.

This application claims priority to Indian Provisional Patent Application No. 201741028320, filed on Aug. 9, 2017, entitled “TECHNIQUES AND APPARATUSES FOR POSITIONING REFERENCE SIGNAL (PRS) MANAGEMENT,” which is hereby expressly incorporated by reference herein.

BACKGROUND

Field

Aspects of the present disclosure generally relate to wireless communication, and more particularly to techniques and apparatuses for positioning reference signal (PRS) management.

Background

A BS and a UE may communicate in a wireless communication system. For example, the UE may receive a channel from the BS, such as a downlink shared channel, a downlink control channel, and/or the like. Additionally, or alternatively, the UE may provide communications to the UE via an uplink channel, such as an uplink shared channel, an uplink control channel, and/or the like. Periodically, the UE may receive a positioning reference signal (PRS) from the BS, and the UE may process the PRS to determine a location of the UE.

Some UEs may be associated with a threshold amount of processing resources, which may enable concurrent processing of uplink channels or downlink channels and one or more PRSs. However, other UEs, such as machine type communication (MTC) UEs, Internet of Things (IoT) UEs, and/or the like, may lack a threshold amount of processing resources. In this case, a UE may not be able to concurrently process one or more PRSs and a channel. Moreover, some UEs may lack processing resources to process the PRS during a period for the PRS, when a PRS periodicity is less than a threshold and a channel is received during the period for the PRS.

SUMMARY

Some aspects, described herein, provide a mechanism by which a UE may drop at least a portion of a channel when the channel collides with a PRS occasion. The PRS occasion may include PRS subframes, warm-up subframes immediately preceding the PRS subframes, and/or cool-down subframes immediately succeeding the PRS subframes. The UE may determine that at least a portion of a channel collides with the PRS occasion, such as colliding with the warm-up subframes, the PRS subframes, and/or the cool-down subframes, and may determine to drop at least a portion of the channel, an entirety of the channel, and/or the like. This may ensure that the UE can successfully receive the PRS and process the PRS.

In an aspect of the disclosure, a method, a user equipment, an apparatus, and a computer program product are provided.

In some aspects, the method may include determining, by a user equipment, that a positioning reference signal (PRS) occasion collides with a channel. The method may include performing, by the user equipment, a collision response action based at least in part on determining that the PRS occasion collides with the channel, wherein the collision response action includes dropping at least a portion of the channel.

In some aspects, the user equipment may include a memory and one or more processors coupled to the memory. The memory and the one or more processors may be configured to determine that a PRS occasion collides with a channel. The memory and the one or more processors may be configured to perform a collision response action based at least in part on determining that the PRS occasion collides with the channel, wherein the collision response action includes dropping at least a portion of the channel.

In some aspects, the apparatus may include means for determining that a PRS occasion collides with a channel. The apparatus may include means for performing a collision response action based at least in part on determining that the PRS occasion collides with the channel, wherein the collision response action includes dropping at least a portion of the channel.

In some aspects, the computer program product may include a non-transitory computer-readable medium storing one or more instructions for wireless communication that, when executed by one or more processors of a user equipment, cause the one or more processors to determine that a PRS occasion collides with a channel. The one or more instructions may cause the one or more processors to perform a collision response action based at least in part on determining that the PRS occasion collides with the channel, wherein the collision response action includes dropping at least a portion of the channel.

DETAILED DESCRIPTION

The detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to represent the configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purposes of providing a thorough understanding of various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form in order to avoid obscuring such concepts.

A network controller130may couple to a set of BSs and may provide coordination and control for these BSs. Network controller130may communicate with the BSs via a backhaul. The BSs may also communicate with one another (e.g., directly or indirectly) via a wireless or wireline backhaul. In some aspects, network controller130may communicate with the BSs to identify a resource allocation for a channel of a cell. For example, network controller130may determine that the channel is to be transmitted by a first BS using a particular set of time resources, a particular set of frequency resources, and/or the like. In this case, UE120may be configured for receiving a PRS from a second BS at the particular set of time resources, the particular set of frequency resources, and/or the like. UE120may determine that a PRS occasion that includes the PRS collides with a portion of the channel, and may determine to drop the portion of the channel, the entirety of the channel, and/or the like to enable UE120to receive and/or process the PRS.

In some aspects, UE120may determine that a positioning reference signal (PRS) occasion collides with a channel. In some aspects, UE120may perform a collision response action based at least in part on determining that the PRS occasion collides with the channel. For example, UE120may drop a portion of a channel, an entirety of a channel, and/or the like.

In some examples, access to the air interface may be scheduled, wherein a scheduling entity (e.g., a base station) allocates resources for communication among some or all devices and equipment within the scheduling entity's service area or cell. Within the present disclosure, as discussed further below, the scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more subordinate entities. That is, for scheduled communication, subordinate entities utilize resources allocated by the scheduling entity. For example, the scheduling entity may schedule transmission of a channel (e.g., an uplink channel or a downlink channel), a PRS occasion, and/or the like.

Base stations are not the only entities that may function as a scheduling entity. That is, in some examples, a UE may function as a scheduling entity, scheduling resources for one or more subordinate entities (e.g., one or more other UEs). In this example, the UE is functioning as a scheduling entity, and other UEs utilize resources scheduled by the UE for wireless communication. A UE may function as a scheduling entity in a peer-to-peer (P2P) network, and/or in a mesh network. In a mesh network example, UEs may optionally communicate directly with one another in addition to communicating with the scheduling entity.

Controller/processor240of base station110, controller/processor280of UE120, and/or any other component(s) ofFIG. 2may perform one or more techniques associated with PRS management, as described in more detail elsewhere herein. For example, controller/processor240of base station110, controller/processor280of UE120, and/or any other component(s) ofFIG. 2may perform or direct operations of, for example, method1000ofFIG. 10and/or other processes as described herein. Memories242and282may store data and program codes for BS110and UE120, respectively. A scheduler246may schedule UEs for data transmission on the downlink and/or uplink.

As indicated above,FIG. 2is provided merely as an example. Other examples are possible and may differ from what was described with regard toFIG. 2.

FIG. 3shows an example frame structure300for FDD in a telecommunications system (e.g., LTE). The transmission timeline for each of the downlink and uplink may be partitioned into units of radio frames. Each radio frame may have a predetermined duration (e.g., 10 milliseconds (ms)) and may be partitioned into 10 subframes with indices of 0 through 9. Each subframe may include two slots. Each radio frame may thus include 20 slots with indices of 0 through 19. Each slot may include L symbol periods, e.g., seven symbol periods for a normal cyclic prefix (as shown inFIG. 3) or six symbol periods for an extended cyclic prefix. The 2L symbol periods in each subframe may be assigned indices of 0 through 2L−1.

In certain telecommunications (e.g., LTE), a BS may transmit a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) on the downlink in the center of the system bandwidth for each cell supported by the BS. The PSS and SSS may be transmitted in symbol periods6and5, respectively, in subframes0and5of each radio frame with the normal cyclic prefix, as shown inFIG. 3. The PSS and SSS may be used by UEs for cell search and acquisition. The BS may transmit a cell-specific reference signal (CRS) across the system bandwidth for each cell supported by the BS. The CRS may be transmitted in certain symbol periods of each subframe and may be used by the UEs to perform channel estimation, channel quality measurement, and/or other functions. The BS may also transmit a PRS for a UE. The PRS may be transmitted in a symbol period of a subframe and may be used by a UE to perform location determination. The BS may also transmit a physical broadcast channel (PBCH) in symbol periods0to3in slot1of certain radio frames. The PBCH may carry some system information. The BS may transmit other system information such as system information blocks (SIBs) on a physical downlink shared channel (PDSCH) in certain subframes. The BS may transmit control information/data on a physical downlink control channel (PDCCH) in the first B symbol periods of a subframe, where B may be configurable for each subframe. The BS may transmit traffic data and/or other data on the PDSCH in the remaining symbol periods of each subframe.

In other systems (e.g., such NR or 5G systems), a Node B may transmit these or other signals in these locations or in different locations of the subframe.

As indicated above,FIG. 3is provided merely as an example. Other examples are possible and may differ from what was described with regard toFIG. 3.

FIG. 4shows two example subframe formats410and420with the normal cyclic prefix. The available time frequency resources may be partitioned into resource blocks. Each resource block may cover12subcarriers in one slot and may include a number of resource elements. Each resource element may cover one subcarrier in one symbol period and may be used to send one modulation symbol, which may be a real or complex value.

Subframe format410may be used for two antennas. A CRS may be transmitted from antennas0and1in symbol periods0,4,7and11. A reference signal is a signal that is known a priori by a transmitter and a receiver and may also be referred to as a pilot signal. A CRS is a reference signal that is specific for a cell, e.g., generated based at least in part on a cell identity (ID). InFIG. 4, for a given resource element with label Ra, a modulation symbol may be transmitted on that resource element from antenna a, and no modulation symbols may be transmitted on that resource element from other antennas. Subframe format420may be used with four antennas. A CRS may be transmitted from antennas0and1in symbol periods0,4,7and11and from antennas2and3in symbol periods1and8. For both subframe formats410and420, a CRS may be transmitted on evenly spaced subcarriers, which may be determined based at least in part on cell ID. CRSs may be transmitted on the same or different subcarriers, depending on their cell IDs. For both subframe formats410and420, resource elements not used for the CRS may be used to transmit data (e.g., traffic data, control data, and/or other data).

The PSS, SSS, CRS and PBCH in LTE are described in 3GPP TS 36.211, entitled “Evolved Universal Terrestrial Radio Access (E-UTRA); Physical Channels and Modulation,” which is publicly available.

The wireless network may support hybrid automatic retransmission request (HARQ) for data transmission on the downlink and uplink. For HARQ, a transmitter (e.g., a BS) may send one or more transmissions of a packet until the packet is decoded correctly by a receiver (e.g., a UE) or some other termination condition is encountered. For synchronous HARQ, all transmissions of the packet may be sent in subframes of a single interlace. For asynchronous HARQ, each transmission of the packet may be sent in any subframe.

A UE may be located within the coverage of multiple BSs. One of these BSs may be selected to serve the UE. The serving BS may be selected based at least in part on various criteria such as received signal strength, received signal quality, path loss, and/or the like. Received signal quality may be quantified by a signal-to-noise-and-interference ratio (SINR), or a reference signal received quality (RSRQ), or some other metric.

While aspects of the examples described herein may be associated with LTE technologies, aspects of the present disclosure may be applicable with other wireless communication systems, such as NR or 5G technologies.

New radio (NR) or 5G may refer to radios configured to operate according to a new air interface (e.g., other than Orthogonal Frequency Divisional Multiple Access (OFDMA)-based air interfaces) or fixed transport layer (e.g., other than Internet Protocol (IP)). In aspects, 5G may utilize OFDM with a CP (herein referred to as cyclic prefix OFDM or CP-OFDM) and/or SC-FDM on the uplink, may utilize CP-OFDM on the downlink and include support for half-duplex operation using TDD. In aspects, 5G may, for example, utilize OFDM with a CP (herein referred to as CP-OFDM) and/or discrete Fourier transform spread orthogonal frequency-division multiplexing (DFT-s-OFDM) on the uplink, may utilize CP-OFDM on the downlink and include support for half-duplex operation using TDD. 5G may include Enhanced Mobile Broadband (eMBB) service targeting wide bandwidth (e.g., 80 megahertz (MHz) and beyond), millimeter wave (mmW) targeting high carrier frequency (e.g., 60 gigahertz (GHz)), massive MTC (mMTC) targeting non-backward compatible MTC techniques, and/or mission critical targeting ultra reliable low latency communications (URLLC) service.

A single component carrier bandwidth of 100 MHZ may be supported. 5G resource blocks may span 12 sub-carriers with a sub-carrier bandwidth of 75 kilohertz (kHz) over a 0.1 ms duration. Each radio frame may include 50 subframes with a length of 10 ms. Consequently, each subframe may have a length of 0.2 ms. Each subframe may indicate a link direction (e.g., DL or UL) for data transmission and the link direction for each subframe may be dynamically switched. Each subframe may include DL/UL data as well as DL/UL control data.

The RAN may include a central unit (CU) and distributed units (DUs). A 5G BS (e.g., gNB, 5G Node B, Node B, transmit receive point (TRP), access point (AP)) may correspond to one or multiple BSs. 5G cells can be configured as access cells (ACells) or data only cells (DCells). For example, the RAN (e.g., a central unit or distributed unit) can configure the cells. DCells may be cells used for carrier aggregation or dual connectivity, but not used for initial access, cell selection/reselection, or handover. In some aspects, DCells may not transmit synchronization signals. In some aspects, DCells may transmit synchronization signals. 5G BSs may transmit downlink signals to UEs indicating the cell type. Based at least in part on the cell type indication, the UE may communicate with the 5G BS. For example, the UE may determine 5G BSs to consider for cell selection, access, handover, and/or measurement based at least in part on the indicated cell type.

As indicated above,FIG. 4is provided merely as an example. Other examples are possible and may differ from what was described with regard toFIG. 4.

FIG. 5is a diagram500showing an example of a DL-centric subframe or wireless communication structure. The DL-centric subframe may include a control portion502. The control portion502may exist in the initial or beginning portion of the DL-centric subframe. The control portion502may include various scheduling information and/or control information corresponding to various portions of the DL-centric subframe. In some configurations, the control portion502may be a physical DL control channel (PDCCH), as indicated inFIG. 5. In some configurations, the control portion502may be a machine type communication (MTC) PDCCH (MPDCCH).

The DL-centric subframe may also include a DL data portion504. The DL data portion504may sometimes be referred to as the payload of the DL-centric subframe. The DL data portion504may include the communication resources utilized to communicate DL data from the scheduling entity (e.g., UE or BS) to the subordinate entity (e.g., UE). In some configurations, the DL data portion504may be a physical DL shared channel (PDSCH). In some configurations, DL data portion504may collide with subframes being used by a UE for a PRS. For example, an MPDCCH search space, a scheduled PDSCH, and/or the like may be scheduled for a same resource as a PRS occasion.

The DL-centric subframe may also include an UL short burst portion506. The UL short burst portion506may sometimes be referred to as an UL burst, an UL burst portion, a common UL burst, a short burst, an UL short burst, a common UL short burst, a common UL short burst portion, and/or various other suitable terms. In some aspects, the UL short burst portion506may include one or more reference signals. Additionally, or alternatively, the UL short burst portion506may include feedback information corresponding to various other portions of the DL-centric subframe. For example, the UL short burst portion506may include feedback information corresponding to the control portion502and/or the data portion504. Non-limiting examples of information that may be included in the UL short burst portion506include an ACK signal (e.g., a physical uplink control channel (PUCCH) ACK, a physical uplink shared channel (PUSCH) ACK, an immediate ACK), a NACK signal (e.g., a PUCCH NACK, a PUSCH NACK, an immediate NACK), a scheduling request (SR), a buffer status report (BSR), a HARQ indicator, a channel state indication (CSI), a channel quality indicator (CQI), a sounding reference signal (SRS), a demodulation reference signal (DMRS), PUSCH data, and/or various other suitable types of information. The UL short burst portion506may include additional or alternative information, such as information pertaining to random access channel (RACH) procedures, scheduling requests, and various other suitable types of information.

As illustrated inFIG. 5, the end of the DL data portion504may be separated in time from the beginning of the UL short burst portion506. This time separation may sometimes be referred to as a gap, a guard period, a guard interval, and/or various other suitable terms. This separation provides time for the switch-over from DL communication (e.g., reception operation by the subordinate entity (e.g., UE)) to UL communication (e.g., transmission by the subordinate entity (e.g., UE)). The foregoing is merely one example of a DL-centric wireless communication structure, and alternative structures having similar features may exist without necessarily deviating from the aspects described herein.

As indicated above,FIG. 5is provided merely as an example. Other examples are possible and may differ from what was described with regard toFIG. 5.

FIG. 6is a diagram600showing an example of an UL-centric subframe or wireless communication structure. The UL-centric subframe may include a control portion602. The control portion602may exist in the initial or beginning portion of the UL-centric subframe. The control portion602inFIG. 6may be similar to the control portion502described above with reference toFIG. 5. In some configurations, the control portion602may be a physical DL control channel (PDCCH).

The UL-centric subframe may also include an UL long burst portion604. The UL long burst portion604may sometimes be referred to as the payload of the UL-centric subframe. The UL portion may refer to the communication resources utilized to communicate UL data from the subordinate entity (e.g., UE) to the scheduling entity (e.g., UE or BS).

As illustrated inFIG. 6, the end of the control portion602may be separated in time from the beginning of the UL long burst portion604. This time separation may sometimes be referred to as a gap, guard period, guard interval, and/or various other suitable terms. This separation provides time for the switch-over from DL communication (e.g., reception operation by the scheduling entity) to UL communication (e.g., transmission by the scheduling entity).

The UL-centric subframe may also include an UL short burst portion606. The UL short burst portion606inFIG. 6may be similar to the UL short burst portion506described above with reference toFIG. 5, and may include any of the information described above in connection withFIG. 5. In some configurations, the UL-centric subframe may be utilized for a PUCCH or a PUSCH, and the PUCCH or the PUSCH may collide with a PRS occasion of a UE. The foregoing is merely one example of an UL-centric wireless communication structure and alternative structures having similar features may exist without necessarily deviating from the aspects described herein.

In one example, a wireless communication structure, such as a frame, may include both UL-centric subframes and DL-centric subframes. In this example, the ratio of UL-centric subframes to DL-centric subframes in a frame may be dynamically adjusted based at least in part on the amount of UL data and the amount of DL data that are transmitted. For example, if there is more UL data, then the ratio of UL-centric subframes to DL-centric subframes may be increased. Conversely, if there is more DL data, then the ratio of UL-centric subframes to DL-centric subframes may be decreased.

As indicated above,FIG. 6is provided merely as an example. Other examples are possible and may differ from what was described with regard toFIG. 6.

FIG. 7is a diagram illustrating an example700of performing PRS management. As shown inFIG. 7, example700may include one or more BSs110and a UE120. The BSs110may communicate with UE120. The communication may include PRS occasion702, which includes PRS subframes705, warm-up subframes710, and cool-down subframes715, and may include candidates720(e.g., R1, R2, and R3) of a channel.

In some aspects, PRS subframes705includes one or more subframes allocated for a PRS. For example, PRS subframes705may include one or more subframes of a serving cell, one or more subframes of an inter-frequency cell, and/or the like. In some aspects, PRS subframes705include one or more muted subframes. For example, PRS subframes705may include one or more subframes used by a UE associated with a first cell of a first BS110for measuring a PRS from a second, neighbor cell of a second BS110.

In some aspects, warm-up subframes710may include one or more subframes immediately preceding PRS subframes705. In some aspects, cool-down subframes715may include one or more subframes immediately succeeding PRS subframes705. Based at least in part on warm-up subframes710and/or cool-down subframes715being allocated for PRS occasion702, a likelihood that a UE is unable to process PRS subframes705(e.g., as a result of having less than a threshold amount of processing resources) is reduced relative to PRS occasion702being limited to only PRS subframes705. In other words, warm-up subframes710and cool-down subframes715increase a period of time during which a collision may be determined, thereby providing a guard period for PRS subframes705to enable UE120to prepare for PRS processing and to process PRS subframes705, respectively.

At725, UE120may determine that candidates720of a channel collide with PRS occasion702, and may determine a collision response action. For example, UE120may receive scheduling information identifying a schedule for candidates720(e.g., R1, R2, and R3), and may determine a PRS occasion based at least in part on a PRS periodicity. In this case, a portion of the candidates R1and the candidates R2collides with PRS occasion702. Similarly, the candidate R3collides with PRS occasion702. In some aspects, the channel may be a machine type communication control channel (e.g., an MPDCCH), a downlink shared channel (e.g., a PDSCH), a physical channel (e.g., a PDSCH or a PDCCH), an uplink channel (e.g., a PUCCH or a PUSCH), and/or the like.

In some aspects, UE120may determine a collision response action based at least in part on determining that at least a portion of the channel collides with PRS occasion702. For example, UE120may determine a collision response action that includes dropping at least a portion of the channel. In some aspects, UE120may determine a collision response action based at least in part on a type of the channel. For example, for an MPDCCH, UE120may drop each candidate of the channel (e.g., each of the candidates R1, each of the candidates R2, and the candidate R3).

At730, UE120may perform the collision response action. For example, for an MPDCCH, UE120may drop colliding candidates720of the channel as a collision response action. In this case, UE120may drop the portion of the candidates R1and the candidates R2that collides with PRS occasion702, and the candidate R3(which collides with PRS occasion702). Further, UE120may receive another portion of the candidates R1that do not collide with PRS occasion702and another portion of the candidates R2that do not collide with PRS occasion702.

In another example, UE120may determine and perform another collision response action. For example, for a PDSCH, UE120may drop an entirety of the PDSCH. Similarly, UE120may determine that a portion of the PDSCH is punctured, and may drop the portion of the PDSCH, as described herein with regard toFIG. 8. In some aspects, UE120may determine the collision response action based at least in part on a quantity of guard subframes. For example, for an uplink channel (e.g., a PUCCH or a PUSCH) colliding with PRS occasion702, UE120may determine to drop a portion of the uplink channel colliding with the PRS occasion702and another portion colliding with the quantity of guard subframes associated with transferring from downlink reception to uplink transmission in frequency division duplex (FDD) operation.

As indicated above,FIG. 7is provided as an example. Other examples are possible and may differ from what was described with respect toFIG. 7.

FIG. 8is a diagram illustrating an example800of performing PRS management. As shown inFIG. 8, example800may include one or more BSs110and a UE120in communication. The communication may include PRS occasion802, which includes PRS subframes805, warm-up subframes810, and cool-down subframes815, and the communication may include PDSCH820. In some aspects, PRS subframes805may also include muted subframes (e.g. subframes in which PRS is not transmitted from a BS110, but are used to measure PRS from another BS110).

At825, UE120may determine that PDSCH820collides with PRS occasion802, and may determine a collision response action. For example, UE120may determine that PDSCH820is scheduled for a common time period as PRS occasion802. In some aspects, a subset of repetitions of PDSCH820may collide with PRS occasion802. For example, when a BS110transmits a plurality of repetitions of a group of bits of PDSCH820, a first subset of the plurality of repetitions may collide with PRS occasion802and a second subset of the plurality of repetitions may not collide with PRS occasion802. In some aspects, based at least in part on determining that PDSCH820collides with PRS occasion802, UE120may determine to drop PDSCH820(e.g., the entirety of PDSCH820). In some aspects, UE120may determine to drop a portion of the PDSCH820. For example, UE120may classify PDSCH820as punctured.

At830, UE120may perform the collision response action based at least in part on classifying PDSCH820as punctured. For example, UE120may determine, as a collision response action, to drop the second subset of the plurality of repetitions that collide with PRS occasion and may receive the first subset of the plurality of repetitions that do not collide with PRS occasion802. In this case, UE120may attempt to decode PDSCH820using the first subset of the plurality of repetitions, thereby enabling UE120to receive PDSCH820and a PRS.

In some aspects, UE120may determine whether to drop an entirety of PDSCH820or a subset of repetitions of PDSCH820based at least in part on a quantity of repetitions for PDSCH820. For example, when the quantity of repetitions for PDSCH820exceeds a first threshold, UE120may determine to classify PDSCH820as punctured. In some aspects, when the quantity of repetitions for PDSCH820exceeds a first threshold, and a quantity of the subset of repetitions of PDSCH820that collide with PRS occasion802does not exceed a second threshold, UE120may determine to classify PDSCH820as punctured. In some aspects, UE120may, if PDSCH820is repeated, puncture PDSCH820. In this way, UE120reduces a likelihood that UE120attempts to receive PDSCH820but fails to decode PDSCH820as a result of receiving an insufficient quantity of repetitions.

As indicated above,FIG. 8is provided as an example. Other examples are possible and may differ from what was described with respect toFIG. 8.

FIG. 9is a diagram illustrating an example900of performing PRS management. As shown inFIG. 9, example900includes a BS110and a UE120in communication. In some aspects, BS110may be associated with a serving cell of UE120. The communication may include allocations for PDSCH bandwidth (BW)905and PRS bandwidth (BW)910. PDSCH bandwidth905may overlap with PRS bandwidth910at overlapping portion915. In some aspects, UE120may determine that PDSCH bandwidth905overlaps with PRS bandwidth910based at least in part on received information from BS110. For example, based at least in part on received scheduling information identifying bandwidth allocations, UE120may determine that a PDSCH of PDSCH bandwidth905collides with a PRS of PRS bandwidth910.

At920, UE120may determine a collision response action and perform the collision response action based at least in part on determining that the PDSCH collides with the PRS. For example, UE120may determine to drop an entirety of the PDSCH included in PDSCH bandwidth905. In some aspects, UE120may prioritize the PRS over the PDSCH by classifying the PDSCH as punctured. For example, UE120may prioritize tones or resource blocks of the PRS conveyed in overlapping portion915over tones or resource blocks of the PDSCH conveyed in overlapping portion915. In this case, UE120may receive the PDSCH in portions of PDSCH bandwidth905that do not overlap with PRS bandwidth910enabling UE120to receive the PRS and the PDSCH. Additionally, or alternatively, UE120may drop MPDCCH candidates in overlapping portion915, and may receive the PRS and the PDSCH in overlapping portion915. In some aspects, UE120may prioritize receiving the PDSCH. For example, when the PDSCH is not associated with a plurality of repetitions, UE120may avoid dropping the PDSCH in overlapping portion915to ensure reception of the PDSCH. In this case, UE120may drop the PRS or a portion of the PRS.

At925, UE120may determine a reporting period for a reference signal time difference (RSTD) measurement. For example, UE120may determine to report the RSTD measurement based at least in part on a PRS periodicity. In some aspects, UE120may determine the reporting period based at least in part on a type of UE120. For example, when the PRS reporting occasion periodicity is less than a threshold period, the reporting period determination may be determined as a non-linear function of PRS reporting occasion periodicity. In this case, for a first type of UE (e.g., a low-power UE), a first reporting period may be determined, and for a second type of UE (e.g., a non-low-power UE), a second reporting period may be determined. For example, a PRS reporting latency for PRS periodicities less than a threshold may be a constant, and a PRS reporting latency for PRS periodicities greater than or equal to a threshold may be a linear function of the PRS periodicity. In some aspects, a mobility measurement may be delayed based at least in part on a presence of a measurement gap. For example, UE120may determine to utilize the measurement gap for PRS measurement, and may delay the mobility measurement (e.g. intra or inter frequency neighbor cell measurement).

As indicated above,FIG. 9is provided as an example. Other examples are possible and may differ from what was described with respect toFIG. 9.

FIG. 10is a flow chart of a method1000of wireless communication. The method may be performed by a UE (e.g., the UE120, the apparatus1102/1102′, and/or the like).

At1010, the UE may determine that a positioning reference signal (PRS) occasion collides with a channel. For example, the UE (e.g., using controller/processor280and/or the like) may determine that the channel overlaps with one or more PRS subframes, one or more warm-up subframes immediately preceding the one or more PRS subframes, one or more cool-down subframes immediately succeeding the one or more PRS subframes, and/or the like.

At1020, the UE may perform a collision response action. For example, the UE (e.g., using controller/processor280and/or the like) may determine a collision response action, and may perform the collision response action based at least in part on determining that the PRS occasion collides with the channel.

At1030, in some aspects, the UE may receive at least a portion of the channel. For example, the UE (e.g., using antenna252, DEMOD254, MIMO detector256, receive processor258, controller/processor280, and/or the like) may receive a portion of the channel that is not dropped to enable the UE to receive and/or process a PRS of the PRS occasion.

In some aspects, the collision response action includes a mobility measurement scheduled for a measurement gap being delayed and a PRS measurement occurring during the measurement gap. In some aspects, the collision response action includes determining that the portion of the channel is punctured and dropping the portion of the channel.

In some aspects, the PRS occasion includes at least one subframe before a set of PRS subframes and at least one subframe after the set of PRS subframes. In some aspects, the UE may receive repetitions of the channel. For example, based at least in part on dropping a first set of repetitions of the channel that collide with the PRS occasion, the UE may receive a second set of repetitions of the channel that do not collide with the PRS occasion. In this case, the UE may decode the channel using the second set of repetitions.

In some aspects, the channel is associated with a machine type communication control channel search space and the collision response action includes dropping each candidate of the machine type communication control channel search space. In some aspects, the channel is associated with a machine type communication control channel search space and the collision response action includes dropping colliding candidates in the machine type communication control channel search space. In some aspects, the channel is a downlink shared channel and the collision response action includes dropping an entirety of the downlink shared channel. In some aspects, the channel is a downlink shared channel and the collision response action includes receiving a subset of repetitions of the downlink shared channel.

In some aspects, the channel is a physical channel and the physical channel is dropped based at least in part on a quantity of repetitions of the physical channel. In some aspects, the channel is an uplink channel and the collision response action includes dropping a colliding portion of the uplink channel. In some aspects, the colliding portion of the uplink channel is determined based at least in part on a guard subframe associated with the uplink channel. In some aspects, the PRS occasion includes one or more muted subframes. In some aspects, the collision response action is determined based at least in part on a presence of repetitions of the channel.

In some aspects, a reference signal time difference (RSTD) measurement reporting occasion is determined based at least in part on a periodicity of a PRS reporting occasion and a type of the user equipment. In some aspects, a mobility measurement is delayed based at least in part on a PRS measurement associated with the PRS occasion.

AlthoughFIG. 10shows example blocks of a method of wireless communication, in some aspects, the method may include additional blocks, fewer blocks, different blocks, or differently arranged blocks than those shown inFIG. 10. Additionally, or alternatively, two or more blocks shown inFIG. 10may be performed in parallel.

FIG. 11is a conceptual data flow diagram1100illustrating the data flow between different modules/means/components in an example apparatus1102. The apparatus1102may be a UE. In some aspects, the apparatus1102includes a reception module1104, a determining module1106, a performing module1108, and/or a transmission module1110.

The reception module1104may receive, from a base station1150and as data1112, information associated with a channel, a PRS occasion, and/or the like. For example, the reception module1104may receive a PRS in one or more PRS subframes, a channel, and/or the like. In some aspects, the reception module may receive a portion of a channel. For example, based at least in part on the performing module1108causing a first portion of a channel that collides with a PRS occasion to be dropped, the reception module1104may receive a second portion of the channel that does not collide with the PRS occasion. In some aspects, the reception module1104may receive control information, such as scheduling information, identifying a schedule for a channel, a periodicity of a PRS, and/or the like. In some aspects, the reception module1104may receive information from the performing module1108. For example, the reception module1104may receive information indicating whether to receive a channel, whether to drop a channel, and/or the like.

The determining module1106may receive, from the reception module1104and as data1114, information associated with a schedule for a channel, a periodicity for a PRS occasion, and/or the like. For example, the determining module1106may receive scheduling information identifying a schedule for a channel, a periodicity of a PRS, and/or the like. In this case, the determining module1106may determine that the PRS and/or a warm-up or cool-down subframe contiguous to the PRS collides with a channel (e.g., a downlink channel, an uplink channel, a guard band associated with a transfer between uplink transmission and downlink reception, and/or the like).

The performing module1108may receive, from the determining module1106and as data1116, information associated with determining a collision for a PRS occasion and a channel. For example, the performing module1108may receive information identifying a collision of a portion of a channel with a PRS occasion, and may select a response action. In this case, the performing module1108may perform the response action, such as by causing the reception module1104to drop the channel, drop the portion of the channel, prioritize PRS tones or resource blocks over the channel, and/or the like.

The transmission module1110may receive, from the performing module1108and as data1118, information associated with transmitting a measurement report. For example, the transmission module1110may receive information identifying a periodicity for transmission of a reference signal time difference (RSTD) measurement, and may transmit the RSTD measurement based at least in part on the periodicity. In some aspects, the transmission module1110may receive information associated with dropping a portion of a channel. For example, the performing module1108may cause the transmission module1110to drop a portion of an uplink channel that collides with a PRS occasion. The transmission module1110may provide, to the base station1150and as data1120, a measurement report, a channel, and/or the like.

The number and arrangement of modules shown inFIG. 11are provided as an example. In practice, there may be additional modules, fewer modules, different modules, or differently arranged modules than those shown inFIG. 11. Furthermore, two or more modules shown inFIG. 11may be implemented within a single module, or a single module shown inFIG. 11may be implemented as multiple, distributed modules. Additionally, or alternatively, a set of modules (e.g., one or more modules) shown inFIG. 11may perform one or more functions described as being performed by another set of modules shown inFIG. 11.

FIG. 12is a diagram1200illustrating an example of a hardware implementation for an apparatus1102′ employing a processing system1202. The apparatus1102′ may be a UE.

The processing system1202may be implemented with a bus architecture, represented generally by the bus1204. The bus1204may include any number of interconnecting buses and bridges depending on the specific application of the processing system1202and the overall design constraints. The bus1204links together various circuits including one or more processors and/or hardware modules, represented by the processor1206, the modules1104,1106,1108,1110, and the computer-readable medium/memory1208. The bus1204may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art, and therefore, will not be described any further.

The processing system1202may be coupled to a transceiver1210. The transceiver1210is coupled to one or more antennas1212. The transceiver1210provides a means for communicating with various other apparatus over a transmission medium. The transceiver1210receives a signal from the one or more antennas1212, extracts information from the received signal, and provides the extracted information to the processing system1202, specifically the reception module1104. In addition, the transceiver1210receives information from the processing system1202, specifically the transmission module1110, and based at least in part on the received information, generates a signal to be applied to the one or more antennas1212. The processing system1202includes a processor1206coupled to a computer-readable medium/memory1208. The processor1206is responsible for general processing, including the execution of software stored on the computer-readable medium/memory1208. The software, when executed by the processor1206, causes the processing system1202to perform the various functions described supra for any particular apparatus. The computer-readable medium/memory1208may also be used for storing data that is manipulated by the processor1206when executing software. The processing system further includes at least one of the modules1104,1106,1108, and1110. The modules may be software modules running in the processor1206, resident/stored in the computer readable medium/memory1208, one or more hardware modules coupled to the processor1206, or some combination thereof. The processing system1202may be a component of the UE120and may include the memory282and/or at least one of the TX MIMO processor266, the RX processor258, and/or the controller/processor280.

In some aspects, the apparatus1102/1102′ for wireless communication includes means for determining that a PRS occasion collides with a channel, and means for performing a collision response action based at least in part on determining that the PRS occasion collides with the channel. The aforementioned means may be one or more of the aforementioned modules of the apparatus1102and/or the processing system1202of the apparatus1102′ configured to perform the functions recited by the aforementioned means. As described supra, the processing system1202may include the TX MIMO processor266, the RX processor258, and/or the controller/processor280. As such, in one configuration, the aforementioned means may be the TX MIMO processor266, the RX processor258, and/or the controller/processor280configured to perform the functions recited by the aforementioned means.

FIG. 12is provided as an example. Other examples are possible and may differ from what was described in connection withFIG. 12.