Low power wake up receiver based cell reselection

Abstract

A user equipment (UE) includes a transceiver, a low power wake-up receiver (LP-WUR), and a processor. The processor is configured to receive, via the LP-WUR, a reference signal associated with a low power wake-up transmitter. The processor is further configured to determine whether a power measurement of the reference signal satisfies a signal power condition for UE mobility. The processor is further configured to determine, while operating in the lower power state and based at least in part on whether the power measurement of the reference signal satisfies the signal power condition, whether to perform a UE mobility operation. In some embodiments, the UE mobility operation includes a cell reselection procedure, and may be performed with the transceiver in the lower power state. In some embodiments, the UE mobility operation includes waking up the transceiver where the transceiver is used to measure reference signals for UE mobility.

Description

LOW POWER WAKE UP RECEIVER BASED CELL RESELECTIONCROSS-REFERENCE TO RELATED APPLICATION

[0001] This Patent Cooperation Treaty patent application claims priority to U.S. Provisional Patent Application No. 63 / 536,309, filed September 1, 2023, and titled “Low Power Wake Up Receiver Based Cell Reselection,” the contents of which are incorporated herein by reference in its entirety.TECHNICAL FIELD

[0002] This application relates generally to wireless communication systems, including systems in which a user equipment (UE) uses a low power wake-up receiver (LP-WUR) to monitor for a low-power synchronization signal (LP-SS), a low power wake-up signal (LP- WUS), or other type of signal transmitted by a network device.BACKGROUND

[0003] Wireless mobile communication technology uses various standards and protocols to transmit data between a network device (e.g., a base station, a radio head, etc.) and a wireless communication device. Wireless communication system standards and protocols can include, for example, 3rd Generation Partnership Project (3GPP) long term evolution (LTE) (e.g., 4G), 3GPP new radio (NR) (e.g., 5G), and IEEE 802.11 standard for wireless local area networks (WLAN) (commonly known to industry groups as Wi-Fi®).

[0004] As contemplated by the 3GPP, different wireless communication systems standards and protocols can use various radio access networks (RANs) for communicating between a network device of the RAN (which may also sometimes be referred to generally as a RAN node, a network node, or simply a node) and a wireless communication device known as a UE. 3 GPP RANs can include, for example, global system for mobile communications (GSM), enhanced data rates for GSM evolution (EDGE) RAN (GERAN), Universal Terrestrial Radio Access Network (UTRAN), Evolved Universal Terrestrial Radio Access Network (E-UTRAN), and / or Next-Generation Radio Access Network (NG-RAN).

[0005] Each RAN may use one or more radio access technologies (RATs) to perform communication between the network device and the UE. For example, the GERAN implementsGSM and / or EDGE RAT, the UTRAN implements universal mobile telecommunication system (UMTS) RAT or other 3GPP RAT, the E-UTRAN implements LTE RAT (sometimes simply referred to as LTE), and NG-RAN implements NR RAT (sometimes referred to herein as 5G RAT, 5G NR RAT, or simply NR). In certain deployments, the E-UTRAN may also implement NR RAT. In certain deployments, NG-RAN may also implement LTE RAT.

[0006] A network device used by a RAN may correspond to that RAN. One example of an E- UTRAN network device is an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) Node B (also commonly denoted as evolved Node B, enhanced Node B, eNodeB, or eNB). One example of an NG-RAN network device is a next generation Node B (also sometimes referred to as a g Node B or gNB).

[0007] A RAN provides its communication services with external entities through its connection to a core network (CN). For example, E-UTRAN may utilize an Evolved Packet Core (EPC), while NG-RAN may utilize a 5G Core Network (5GC).BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

[0008] To easily identify the discussion of any particular element or act, the most significant digit or digits in a reference number refer to the figure number in which that element is first introduced.

[0009] FIG. 1 shows an example wireless communication system, according to embodiments described herein.

[0010] FIG. 2 shows an example wireless communication system, according to embodiments described herein.

[0011] FIG. 3 shows an example wireless communication system, according to embodiments described herein.

[0012] FIG. 4 shows an example wireless communication system, according to embodiments described herein.

[0013] FIG. 5 shows an example method of wireless communication by a UE, according to embodiments described herein.

[0014] FIG. 6 shows another example method of wireless communication by a UE, according to embodiments described herein.

[0015] FIG. 7 shows an example method of wireless communication by a network device, according to embodiments described herein.

[0016] FIG. 8 illustrates an example architecture of a wireless communication system, according to embodiments described herein.

[0017] FIG. 9 illustrates an example system for performing signaling between a wireless device and a network device, according to embodiments described herein.DETAILED DESCRIPTION

[0018] Various embodiments are described with regard to a UE. However, reference to a UE is merely provided for illustrative purposes. The example embodiments may be utilized with any electronic component that may establish a connection to a network and is configured with the hardware, software, and / or firmware to exchange information and data with a network. Therefore, the UE as described herein is used to represent any appropriate electronic device.

[0019] FIG. 1 shows an example wireless communications system 100. The wireless communications system may include a UE 102 that is connected, over the air, to a network (e.g., a 3GPP network). The UE 102 may communicate with the network on one or more uplink (UL) channels and one or more downlink (DL) channels, and more particularly may communicate with one or more network devices of a RAN (e.g., network devices 104-1 and 104-2, which may take the form of one or more base stations, remote radio heads, etc.) on the one or more UL channels and DL channels. Depending on the capabilities of the UE 102 and the UE’s configuration by the network, the UE 102 may communicate with the one or more network devices 104-1, 104-2 simultaneously, contemporaneously (e.g., in a multiple input multiple output (MIMO) mode), or sequentially (e.g., when handed over).

[0020] In some cases, the UE 102 may be connected to a first network device 104-1 in a radio resource control (RRC) connected mode state, and a second network device 104-2 may belong to a neighbor cell of the cell containing the first network device 104-1. For radio resource management (RRM) purposes (e.g., mobility management), the UE 102 may measure one or more signals transmitted by the second network device 104-2 (e.g., to determine whether the UE 102 should be handed over to the second network device 104-2 or communicate with both the first network device 104-1 and the second network device 104-2).

[0021] In some embodiments, the UE 102 may have a main radio (or transceiver) that can be used for RRM purposes and data / control reception / transmission, and a LP-WUR that is operable at a lower power level (e.g., much lower power level) than the main radio (e.g., in some cases, an order of magnitude or two less power than the main radio). As used herein, the main radio of the UE 102 can operate in a lower power state (e.g., a lower power than a normal (or higher) operating power state, or OFF state) while the LP-WUR operates (e.g., at the lower power level of the LP-WUR). The main radio awakening or being woken up refers to the main radio transitioning to or operating in the relatively higher power level of the normal (or higher) operating power state. The LP-WUR may support limited functionality, such as the monitoring / detection of a LP-SS, LP-WUS, or both, when the UE 102 is in an RRC inactive mode state or an RRC idle mode state with respect to a network device. As used herein, a “main”radio of UE 102 is a radio that would normally be used to facilitate the main or mission function(s) of the UE 102, for example voice communication, data transfer, sensing / reporting, or otherwise. In a fully operational state (e.g., higher power state, or ON state), the main radio may consume much more power than the LP-WUR, and possibly one or more orders of magnitude more power than the LP-WUR. Conventionally, the main radio is a cellular radio or 3GPP standards-based radio, but in other applications, scenarios or deployments, the main radio could additionally or alternatively be a Wi-Fi®-based radio, or other type of radio.

[0022] When the main radio is used for RRM purposes (e.g., when the UE 102 is in an RRC connected mode state), the measurement of a reference signal (RS) transmitted by a network device may be measured without a measurement gap (MG) if the RS (e.g., all or a portion of a synchronization signal block (SSB), such as one or more of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), or a physical broadcast channel (PBCH) demodulation reference signal (DMRS)) is inside an active bandwidth part (BWP) of the UE 102, but may need to be measured in a measurement gap if the RS is outside an active BWP of the UE 102. When the RS is within an active BWP of the UE 102, the RS may be measured without a scheduling restriction if the RS and data / control reception / transmission of the main radio use a same numerology (e.g., a same subcarrier spacing (SCS) on the same carrier in a first frequency range (e.g., FR1)) and same receive (Rx) beam (e.g., in a second frequency range (e.g., FR2)). However, the RS may need to be measured with a scheduling restriction if the RS and data / control reception / transmission of the main radio use a mixed numerology and / or different Rx beams.

[0023] In some cases, the second network device 104-2 may transmit various reference signals including, for example, one or more of an SSB, a LP-SS, or a LP-WUS.

[0024] In one or more embodiments, the LP-SS is a synchronization signal that is used for time and / or frequency synchronization of the LP-WUR, including to aid reception of a LP-WUS. In some embodiment the synchronization signal is transmitted periodically (e.g., one or more times per a discontinuous reception (DRX) cycle, or at some other periodic duty cycle, or according to another period). In some embodiments, the LP-SS is a sequence, for example similar to (e.g., of same design but different length) or the same (e.g., same sequence and length) as a PSS or an SSS, such as a single M sequence (e.g., of length 127), two different cyclic shifts of a single M sequence (e.g., of length 31), or a frequency-domain Zadhoff-Chu sequence (e.g., of length 63). In yet other embodiments, the LP-SS is a different design of reference signal and / or sequence. In some embodiments, the LP-SS carries one or more bits of information via the synchronization signal, or one or more signals transmitted with the synchronization signal.

[0025] The second network device 104-2 may transmit one or more LP-WUSs, to wake one or more UEs that are in an RRC inactive mode state or an RRC idle mode state with respect to the second network device 104-2. In one or more embodiments, the first network device 104-1 may be a serving cell for the UE 102, and the second network device 104-2 may be an LP wake up transmitter (LP-WUT) (e.g., either alone or in addition to being a serving cell for one or more UEs). In some deployments, the network (e.g., including the RAN) may provide a LP-WUS and / or LP-SS with a different coverage area than other reference signals that are used for RRM purposes (e.g., UE mobility), such as cell-specific reference signals, including SSBs. Conventionally, the UE 102 would measure, using a main radio (or transceiver) the SSB transmitted by the serving cells of the first network device 104-1 (e.g., a serving cell of UE 102) as well as one or more neighboring cells, such as the second network device 104-2, for RRM purposes. As such, the UE 102 would need to be awake (e.g., the transceiver operating in a higher power state, or ON state) to perform such measurements. However, if the UE 102 includes both a main radio (or transceiver) and a LP-WUR, the UE 102 may determine, when in the RRC inactive mode state or RRC idle mode state with respect to the main radio (or transceiver) to 1) use the LP-WUR to monitor for a LP-WUS transmitted by the first network device 104-1, and / or 2) also use the LP-WUR to measure the SSBs (or other cell-specific RS) transmitted by the first network device 104-1 and / or the second network device 104-2, for RRM purposes. However, because the coverage areas for the cell-specific references signals (e.g., SSBs) and corresponding serving cells, including the coverage area for signals transmitted by the first network device 104-1, are different from the coverage areas for the LP-WUS and / or LP-SS (transmitted by the second network device 104-2), the cell-specific RS of the first network device 104-1 cannot necessarily be used directly for RRM purposes by the UE 102 (e.g., for reselection from the first network device 104-1 to a neighboring serving cell). However, awakening the main radio for RRM purposes is undesirable, for example due to additional power consumption.

[0026] As further described herein, the UE 102 can operate with a main radio (or transceiver) that is in a lower power state. While the main radio is in the lower power state, the UE 102 monitors (listens, or otherwise is prepared to receive) and receives, via the LP-WUR, reference signals (e.g., LP-SS, LP-WUS) from one or more LP-WUTs (e.g., the second network device 104-2). The UE 102 performs a measurement procedure to determine a power measurement for the received reference signals. In some embodiments, the power measurement is a reference signal received power (RSRP) measurement. In other embodiments, the power measurement is a reference signal received quality (RSRQ) measurement. In yet other embodiments, the power measurement is a signal-to-interference-plus-noise ratio (SINR) measurement. Someembodiments may use a combination of two or more of an RSRP, RSRP, or SINR, or another type of appropriate or desired power measurement.

[0027] The UE 102 then determines whether the power measurement of the reference signal satisfies a signal power condition for UE mobility. In some embodiments, different serving cells (e.g., including at least a serving cell of the first network device 104-1) are associated with different respective signal power ranges. For example, serving cells of different network devices may be farther in distance from the LP-WUT, such that different power measurements can be attributed to different serving cells.

[0028] If the signal power condition is satisfied, in one or more embodiments, the UE 102 uses the power measurements as inputs to a UE mobility procedure and determines mobility based on the power measurements being within a particular range of power measurement values. In some embodiments, the UE 102 uses the power measurements being within a particular range of power measurement values to determine whether to wake up the main radio (or transceiver) so that the main radio can be used to perform measurements for RRM purposes (e.g., to measure SSBs of serving cells for UE mobility). In other embodiments, the UE 102 uses a variation in the power measurement values to determine whether to wake up the main radio so that the main radio can be used to perform measurements for RRM purposes.

[0029] In some deployments, the UE 102 can receive reference signals from the second network device 104-2 and one or more additional network devices, for example if the UE 102 is at an intersection or overlap of coverage areas for such reference signals. In one or more embodiments, in addition to or as an alternative to the signal power conditions described herein, the UE 102 may use a difference (or delta) between a power measurement associated with one LP-WUT and a power measurement associated with a different LP-WUT to determine whether the signal power condition is satisfied.

[0030] If the signal power condition fails to be satisfied, for example because the power measurements indicate that the UE 102 has not moved out of the current serving cell, then the UE 102 may maintain the transceiver in the lower power state (e.g., and continue to listen for reference signals transmitted by LP-WUTs, such as second network device 104-2).

[0031] FIG. 2 shows an example wireless communications system 200. The wireless communications system 200 includes a UE 230 that is connected, over the air, to a network (e.g., a 3GPP network). Wireless communications system 200 includes at least a first network device 204, second network device 206, third network device 208, and fourth network device 202. In some embodiments, the UE 230 may be an example of a UE 102.

[0032] First network device 204, second network device 206, and / or third network device 208 may be examples of a first network device 104-1 . First network device 204 provides network communication resources to UEs (e.g., RRC-connected UEs transmitting on UL resources to the network or receiving on DL resources from the network) within a coverage area 226 corresponding to a first serving cell (CELLI). Second network device 206 provides network communication resources to UEs within a coverage area 224 corresponding to a second serving cell (CELL2). Third network device 208 provides network communication resources to UEs within a coverage area 222 corresponding to a third serving cell (CELL3). Coverage area 224 may overlap at least a portion of coverage area 226, and coverage area 222 may overlap at least a portion of coverage area 224.

[0033] Fourth network device 202 may be an example of a second network device 104-2. Fourth network device 202 transmits signaling associated with LP-WUR operation for UEs within a coverage area 232, including associated reference signals (e.g., LP-SS or the LP-WUS). Coverage area 232 may include (geographically encompass, cover, encircle) coverage area 222, coverage area 224, and coverage area 226.

[0034] In one or more embodiments, ranges for power measurements (e.g., one or more of an RSRP, RSRQ, or SINR) are used to determine UE mobility. The network may configure the UE 230 (e.g., and other UEs within coverage area 232) with a set of power measurement values and corresponding serving cells. In some embodiments, a first range 220 (RANGE0) corresponds to a range between zero and a first power measurement value 214 (e.g., RSRP1), a second range 218 (RANGE 1) corresponds to a range between the first power measurement value 214 and a second power measurement value 212 (e.g., RSRP2), and a third range 216 (RANGE2) corresponds to a range between the second power measurement value 212 and a third power measurement value 210 (e.g., RSRP3). The first power measurement value 214 may be greater than the second power measurement value 212, and the second power measurement value 212 may be greater than the third power measurement value 210 (e.g., RSRP1 > RSRP2 > RSRP3).

[0035] In one or more embodiments, the UE 230 is configured with the ranges (e.g., at least the first range 220, the second range 218, and the third range 216) for power measurements by the network. In some embodiments, the fourth network device 202 (e.g., a LP-WUT) transmits configuration signaling to the UE 230 (e.g., via system information, such as a master information block (MIB) or a system information block (SIB), radio resource control (RRC) signaling, or other control signaling) that indicates the correspondence between the set of power measurement values and the serving cells. In other embodiments, one or more of the first network device 204, second network device 206, and / or third network device 208 may transmit such configurationsignaling to the UE 230. In yet other embodiments, the UE 230 may obtain the correspondence information via another suitable signaling.

[0036] Although RSRP is used for the one or more embodiments illustrated for wireless communications system 200, in other embodiments RSRQ, SINR, other measurements (e.g., power measurements), or a combination of these, may also be used for reference signals transmitted by a LP-WUT (e.g., including fourth network device 202) consistent with the techniques described herein.

[0037] In one or more embodiments, the UE 230 may be physically within coverage area 224. The UE 230 uses the LP-WUR to take measurements of the reference signals transmitted by (from) the fourth network device 202. The UE 230 receives the reference signals via the LP- WUR, determines the power measurement, and compares the power measurement against a signal power condition. In one or more embodiments, the signal power condition is if the power measurement falls within a signal power range (and in which range) (e.g., the first range 220, the second range 218, or the third range 216). Based on whether the power measurement falls within the range, the UE 230 determines whether to perform a UE mobility operation. For example, in one or more embodiments, the UE 230 determines that the range has changed (e.g., UE 230 has moved 234 from the second range 218 into the third range 216, as illustrated for wireless communications system 200), and UE 230 then performs a cell reselection procedure. The cell reselection procedure is an example of a UE mobility procedure.

[0038] In one or more embodiments, the UE 230 can, while the main radio (or transceiver) is operating in the lower power state, receive reference signals via the LP-WUR, determine whether the power measurement satisfies the signal power condition, and determine whether to perform the UE mobility procedure (e.g., cell reselection). In one or more embodiments, the lower power state for the transceiver is that the transceiver of the UE 230 is operating according to a lower than normal operating power. In some embodiments, the lower power state is that the transceiver is OFF (in an OFF state).

[0039] In some embodiments, the fourth network device 202 transmits the reference signals (e.g., LP-SS and / or LP-WUS) directionally (e.g., using beamforming), such that a single one of the serving cells (e.g., CELLI, CELL2, or CELL3) corresponds to a single signal power range, and thus the UE 230 can identify that it is within a geographic location corresponding to a single serving cell.

[0040] According to one or more embodiments, the signal power ranges (e.g., a set of signal power ranges including the first range 220, the second range 218, and the third range 216) are used to determine whether to awaken the main radio of the UE 230. The network can configurethe boundary (threshold) for the signal power ranges. When the UE 230 determines that the power measurement of the reference signal satisfies the signal power condition (e.g., the signal power range boundary is crossed, such that the power measurement falls in a different range), the LP-WUR of the UE 230 (e.g., or a processor of the UE 230 in communication with the LP-WUR of the UE 230) provides an indication to the main radio of the UE 230 for the main radio to wake up (e.g., exit a lower power state, or OFF state, and enter or otherwise transition to a higher power state, or ON state).

[0041] In one or more embodiments, once the main radio of the UE 230 is woken up, the main radio is used to perform a cell reselection procedure, which can include on or more of cell determine, synchronization, or measurement using the main radio based on convention (e.g., legacy) reference signals (e.g., SSBs) transmitted by one or more network devices corresponding to one or more serving cells (e.g., from first network device 204, second network device 206, or third network device 208).

[0042] Tn some embodiments, the network configures the UE 230 with an association (correspondence, mapping) between different serving cells and signal power ranges, as further described herein, and the UE 230 can detect the serving cells associated with one of the ranges. In other embodiments, the network does not configure the UE 230 (or otherwise provide to the UE 230) the association between different serving cells and signal power ranges, and the UE 230 performs a blind detection procedure to detect serving cells.

[0043] FIG. 3 shows an example wireless communications system 300. The wireless communications system 300 includes a UE 330 that is connected, over the air, to a network (e.g., a 3GPP network). In some embodiments, the UE 330 may be an example of a UE 102 or a UE 230.

[0044] Wireless communications system 300 includes at least a first network device 308 with associated coverage area 326 (CELLI), a second network device 306 with associated coverage area 324 (CELL2), a third network device 304 with associated coverage area 322 (CELL3), a fourth network device 332 with associated coverage area 334 (CELL4), a fifth network device 342 with associated coverage area 344 (CELL5), and sixth network device 302 with associated coverage area 340 (e.g., a coverage area for the transmission of references signals (e.g., LP-SS and / or LP-WUS) by a LP-WUT). Coverage area 340 may include (geographically encompass, cover, encircle) coverage area 322, coverage area 324, coverage area 326, coverage area 334, and coverage area 344.

[0045] In one or more embodiments, the reference signals transmitted by the network are omni-directionally transmitted, or otherwise transmitted in a manner such that multiple servingcells may correspond to or be identified as corresponding to a same signal power range. For example, the reference signals may be transmitted omni-directionally, or transmitted using a relatively broad beamforming that covers are area larger than multiple smaller serving cells.

[0046] In some embodiments, a first range 320 (RANGEO) corresponds to the range between zero and a first power measurement value 314 (e.g., RSRP1). The first range 320 corresponds to the coverage area 326 (CELLI). A second range 318 (RANGE1) corresponds to the range between the first power measurement value 314 and a second power measurement value 312 (e.g., RSRP2). The second range 318 corresponds to at least both the coverage area 324 (CELL2) and the coverage area 334 (CELL4). A third range 316 (RANGE2) corresponds to the range between the second power measurement value 312 and a third power measurement value 310 (e.g., RSRP3). The third range 316 corresponds to at least both the coverage area 322 (CELL3) and the coverage area 344 (CELLS). The first power measurement value 314 is greater than the second power measurement value 312, and the second power measurement value 312 is greater than the third power measurement value 310 (e.g., RSRP1 > RSRP2 > RSRP3).

[0047] According to one or more embodiments, each range can determine multiple cells (e.g., RANGE1 can have CELL2 and CELL4). As such, CELL2 and CELL4 can be a first cell group, and CELL3 and CELL5 can be a second cell group. UE 330 can determine cell group to cell group reselection by detecting the range change. For example, UE 330 can detect a move 346 (change) from the second range 318 (corresponding to the first cell group) to the third range 316 (corresponding to the second cell group), as illustrated for wireless communications system 300. As a result, according to one or more embodiments, when the UE 330 needs waking up of the main radio (or transceiver) later, UE 330 can only synchronize to the serving cells in the second cell group (e.g., CELL2 and CELL4).

[0048] According to one or more embodiments, the range change includes a power variation threshold as an example of the signal power condition, and the power variation threshold is satisfied prior to the UE 330 determining to perform the UE mobility operation (e.g., providing an indication to the main radio to awaken to perform sell reselection). In one or more embodiments, the power variation threshold may be a difference between power measurement values (e.g., RSRP1 minus RSRP2). In some embodiments, the UE 330 determines a power measurement value, and once the power variation threshold is satisfied (e.g., the power measurement value changes by at least RSRP1 minus RSRP2), the UE 330 determines to perform the UE mobility operation.

[0049] FIG. 4 shows an example wireless communications system 400. The wireless communications system 400 includes a UE 406 that is connected, over the air, to a network (e.g.,a 3GPP network). In some embodiments, the UE 406 may be an example of a UE 102, a UE 230, or a UE 330.

[0050] Wireless communications system 400 includes at least a first network device 404 associated with a coverage area 424 for reference signals (e.g., one or both of LP-WUS or EPSS) that are transmitted by the first network device 404 (e.g., a LP-WUS or LP-SS). Coverage area 424 includes (geographically covers, encompasses) coverage area 410 associated with a first serving cell (CELLI), coverage area 412 associated with a second serving cell (CELL2), and coverage area 414 associated with a third serving cell (CELL3). Reference signals (e.g., one or both of a LP-SS or LP-WUS) transmitted by the first network device 404 may be associated with a power measurement value 430 (e.g., RSRP1-1) at or near an edge (boundary, limit) of coverage area 410. Similarly, reference signals transmitted by the first network device 404 may be associated with a power measurement value 432 (e.g., RSRP1-2), a power measurement value 434 (e.g., RSRP1-3), a power measurement value 436 (e.g., RSRP1-4), and a power measurement value 438 (e.g., RSRP1-5) at or near an edge (boundary, limit) of coverage area 412, coverage area 414, coverage area 420, coverage area 418, and coverage area 416, respectively.

[0051] Wireless communications system 400 also includes at least a second network device 402 associated with a coverage area 422 for reference signals that are transmitted by the second network device 402 (e.g., one or both of LP-WUS or LP-SS). Coverage area 422 includes (geographically covers, encompasses) coverage area 416 associated with a fourth serving cell (CELL4), coverage area 418 associated with a fifth serving cell (CELL5), and coverage area 420 associated with a sixth serving cell (CELL6). Reference signals (e.g., one or both of a LP-SS or LP-WUS) transmitted by the second network device 402 may be associated with a power measurement value 440 (e.g., RSRP2-1) at or near an edge (boundary, limit) of coverage area 416. Similarly, reference signals transmitted by the second network device 402 may be associated with a power measurement value 442 (e.g., RSRP2-2), a power measurement value 444 (e.g., RSRP2-3), a power measurement value 446 (e.g., RSRP2-4), and a power measurement value 448 (e.g., RSRP2-5) at or near an edge (boundary, limit) of coverage area 418, coverage area 420, coverage area 414, and coverage area 412, respectively.

[0052] In some embodiments or deployments, the UE 406 may be or operate in a lower power state (e.g., main radio in a lower power state) and listening (monitoring, prepared to receive) for LP-WUS using a LP-WUR, while the UE 406 is located in or moving around in or near an intersection of coverage areas between two different LP-WUT (e.g., two different networkdevices transmitting signals such as LP-WUS compatible with LP-WUR operation). The UE 406 may therefore receive different reference signals from different LP-WUTs.

[0053] According to one or more embodiments, the UE 406 use signal power ranges to determine UE mobility. For example, the UE 406 may receive reference signals from the first network device 404 and determine that the UE 406 is within the coverage area 414. The UE 406 may then take no action or otherwise determine not to perform any UE mobility operation, for example, because the UE 406 previously established an RRC connection or other communication link with a network device serving the serving cell associated with coverage area 414 (and thus the signal power range from the power measurement value 432 (e.g., RSRP1-2) to the power measurement value 434 (e.g., RSRP1-3). At a different time, UE 406 may move 408 to another area corresponding to being within the coverage area 420. The UE 406 can determine that the move has occurred by measuring receiving reference signals from the first network device 404, from the second network device 402, or both, and determine that the power measurement of the reference signal(s) is associated with coverage area 420 because it is within the signal power range from the power measurement value 436 (e.g., RSRP1-4) to the power measurement value 434 (e.g., RSRP1-3) (if the reference signal is from the first network device 404) or because it is within the signal power range from the power measurement value 442 (e.g., RSRP2-2) to the power measurement value 444 (e.g., RSRP2-3) (if the reference signal is from the second network device 402). The UE 406 may then determine to perform a UE mobility operation.

[0054] In one or more embodiments, the UE 406 is configured with the set of ranges for power measurements by the network, including a first set of signal power ranges and associated serving cells for the first network device 404 and a second set of signal power ranges and associated serving cells for the second network device 402 via any suitable control signaling, as further described herein (e.g., from a serving cell, a LP-WUT, or other network device of a RAN, such as wireless communications system 400).

[0055] In one or more embodiments, as further described herein, the UE 406 (operating in or near an intersection of coverages areas of different LP-WUTs) can use the power measurements taken of the reference signals (e.g., LP-SS and / or LP-WUS) using the LP-WUR while the transceiver is in a lower power state to directly determine whether and how to perform a UE mobility operation. In some embodiments, the UE 406 (operating in or near an intersection of coverages areas of different LP-WUTs) can use the power measurements to determine, based on determining (detecting, identifying) a changes in signal power ranges, to wake the transceiver of the UE 406 to perform one or more operations for cell reselection suing the transceiver (or main radio), as further described herein. In some embodiments, the UE 406 (operating in or near anintersection of coverages areas of different LP-WUTs) can use the power measurements to determine, based on determining (detecting, identifying) that a power variation threshold has been satisfied, to wake the transceiver of the UE 406 to perform one or more operations for cell reselection using the transceiver (or main radio), as further described herein.

[0056] FIG. 5 shows an example method 500 of wireless communication by a UE. In some cases, the UE may be the UE 102, the UE 230, the UE 330, or the UE 406, or one of the other UEs described herein. The method 500 may be performed using a processor, a main radio (or transceiver), a WUR (e.g., a LP-WUR), or other components of the UE.

[0057] At 502, the method 500 may include receiving a reference signal associated with a low power wake-up transmitter. In some embodiments, the reference signal may be received via a LP-WUR of the UE. The reference signal may be received while the main radio of the UE is operating in the lower power state.

[0058] At 504, the method 500 may include determining whether a power measurement of the reference signal satisfies a signal power condition for UE mobility. The determining whether the power measurement satisfies the signal power condition may be performed while the main radio of the UE is operating in the lower power state.

[0059] At 506, the method 500 may include determining whether to perform a UE mobility operation based at least in part on whether the power measurement of the reference signal satisfies the signal power condition. Determining whether to perform the UE mobility operation may be performed while the main radio of the UE is operating in the lower power state.

[0060] The method 500 may be variously embodied, extended, or adapted, as described in the following paragraphs and elsewhere in this description.

[0061] In some embodiments of the method 500, the method 500 may further include performing a cell reselection procedure to a serving cell based at least in part on the power measurement of the reference signal satisfying a signal power range corresponding to the serving cell, wherein the signal power condition comprises the signal power range corresponding to the serving cell, and the UE mobility operation comprising the cell reselection procedure. In some embodiments of the method 500, the method 500 may further include identifying the serving cell based at least in part on the signal power range corresponding to a single serving cell. In some embodiments of the method 500, the method 500 may further include, where the reference signal is a first reference signal, identifying a group of serving cells, including the serving cell, based at least in part on the signal power range corresponding to the group of serving cells, and selectingthe serving cell from the group of serving cells based at least in part on one or more power measurements of a second reference signal received via a transceiver of the UE,

[0062] In some embodiments of the method 500, the method 500 may further include performing a cell reselection procedure to a serving cell based at least in part on the power measurement of the reference signal satisfying a signal power range corresponding to the serving cell, wherein the signal power condition comprises the signal power range corresponding to the serving cell, and the UE mobility operation comprising the cell reselection procedure,

[0063] In some embodiments of the method 500, the method 500 may further include, where the reference signal is a first reference signal, providing, to a transceiver of the UE and based at least in part on a power variation for the power measurement of the first reference signal satisfying a power variation threshold, an indication for a transceiver of the UE to operate in a higher power state to perform a cell reselection procedure using one or more power measurements of a second reference signal received via the transceiver associated with the main radio, wherein the signal power condition comprises the power variation threshold, and the UE mobility operation comprising the cell reselection procedure,

[0064] In some embodiments of the method 500, the method 500 may further include, where the reference signal is a first reference signal, providing, to a transceiver of the UE and based at least in part on the power measurement of the first reference signal satisfying a signal power difference between a first serving cell and a second serving cell, an indication for a transceiver of the UE to operate in a higher power state to perform a cell reselection procedure using one or more power measurements of a second reference signal received via the transceiver associated with the main radio, wherein the signal power condition comprises the a signal power difference, and the UE mobility operation comprising the cell reselection procedure.

[0065] In some embodiments of the method 500, the power measurement is a RSRP measurement, a RSRQ measurement, or a SINR measurement. In some embodiments of the method 500, the reference signal associated with the LP-WUT is a LP-SS or a LP-WUS.

[0066] FIG. 6 shows an example method 600 of wireless communication by a UE. In some cases, the UE may be the UE 102, the UE 230, the UE 330, or the UE 406, or one of the other UEs described herein. The method 600 may be performed using a processor, a main radio (or transceiver), a WUR (e.g., a LP-WUR), or other components of the UE.

[0067] At 602, the method 600 may include receiving a reference signal associated with a low power wake-up transmitter. In some embodiments, the reference signal may be received via aLP-WUR of the UE. The first reference signal may be received while the main radio of the UE is operating in the lower power state.

[0068] At 604, the method 600 may include performing one or more measurements (e.g., power measurements, such as RSRP, RSRQ, SINR, or a combination) of the reference signal to generate a power measurement of the reference signal.

[0069] At 606, the method 600 may include determining whether the power measurement of the reference signal satisfies a signal power condition for UE mobility. The determining whether the power measurement satisfies the signal power condition may be performed while the transceiver (or main radio) of the UE is operating in the lower power state.

[0070] At 608, the method 600 may include determining whether to perform a UE mobility operation based at least in part on whether the power measurement of the reference signal satisfies the signal power condition. Determining whether to perform the UE mobility operation may be performed while the main radio of the UE is operating in the lower power state.

[0071] At 610, the method 600 may include the UE turning on the transceiver (or main radio) to a higher power state or ON state and performing the UE mobility operation.

[0072] The method 600 may be variously embodied, extended, or adapted, as described in the following paragraphs and elsewhere in this description.

[0073] FIG. 7 shows an example method 700 of wireless communication by a network device (e.g., a network device of a RAN). In some cases, the network device may be one or more of a network device described with reference to FIG. 1, FIG. 2, FIG. 3, FIG. 4, or one of the other network devices described herein. The method 700 may be performed using a processor, a main radio (or transceiver), or other components of the network device.

[0074] At 702, the method 700 may include transmitting, to a UE and via the transceiver associated with a main radio of the UE, configuration information indicating a correspondence between a set of signal power ranges and a set of cell identifiers, the set of signal power ranges indicating a network preference for the UE to perform a UE mobility operation based at least in part on whether a power measurement of a reference signal received via a LP-WUR of the UE satisfies a signal power condition for UE mobility.

[0075] At 704, the method 700 may include transmitting the reference signal.

[0076] The method 700 may be variously embodied, extended, or adapted, as described in the following paragraphs and elsewhere in this description.

[0077] In some embodiments of the method 700, each signal power range of the set of signal power ranges corresponds to a single serving cell of the set of serving cells. Tn some embodiments of the method 700, at least one signal power range of the set of signal power ranges corresponds to a plurality of serving cells of the set of serving cells.

[0078] Embodiments contemplated herein include one or more non-transitory computer- readable media storing instructions to cause an electronic device, upon execution of the instructions by one or more processors of the electronic device, to perform one or more elements of the method 500, 600, or 700. In the context of method 500 or 600, this non-transitory computer-readable media may be, for example, a memory of a UE (such as a memory 906 of a wireless device 902 that is a UE, as described herein). In the context of method 700, this non- transitory computer-readable media may be, for example, a memory of a network device (such as a memory 924 of a network device 920, as described herein).

[0079] Embodiments contemplated herein include an apparatus having logic, modules, or circuitry to perform one or more elements of the method 500, 600, or 700. In the context of method 500 or 600, this apparatus may be, for example, an apparatus of a UE (such as a wireless device 902 that is a UE). In the context of method 700, this apparatus may be, for example, an apparatus of a network device (such as a network device 920, as described herein).

[0080] Embodiments contemplated herein include an apparatus having one or more processors and one or more computer-readable media, using or storing instructions that, when executed by the one or more processors, cause the one or more processors to perform one or more elements of the method 500, 600, or 700. In the context of method 500 or 600, this apparatus may be, for example, an apparatus of a UE (such as a wireless device 902 that is a UE, as described herein). In the context of the method 700, this apparatus may be, for example, an apparatus of a network device (such as a network device 920, as described herein).

[0081] Embodiments contemplated herein include a signal as described in or related to one or more elements of the method 500, 600, or 700.

[0082] Embodiments contemplated herein include a computer program or computer program product having instructions, wherein execution of the program by a processor causes the processor to carry out one or more elements of the method 500, 600, or 700. In the context of method 500 or 600, the processor may be a processor of a UE (such as a processor(s) 904 of a wireless device 902 that is a UE, as described herein), and the instructions may be, for example, located in the processor and / or on a memory of the UE (such as a memory 906 of a wireless device 902 that is a UE, as described herein). In the context of method 700, the processor may be a processor of a network device (such as a processor(s) 922 of a network device 920, asdescribed herein), and the instructions may be, for example, located in the processor and / or on a memory of the network device (such as a memory 924 of a network device 920, as described herein).

[0083] FIG. 8 illustrates an example architecture of a wireless communication system, according to embodiments described herein. The following description is provided for an example wireless communication system 800 that operates in conjunction with the LTE system standards or specifications and / or 5G or NR system standards or specifications, as provided by 3GPP technical specifications.

[0084] As shown by FIG. 8, the wireless communication system 800 includes UE 802 and UE 804 (although any number of UEs may be used). In this example, the UE 802 and the UE 804 are illustrated as smartphones (e.g., handheld touchscreen mobile computing devices connectable to one or more cellular networks) but may also comprise any mobile or non-mobile computing device configured for wireless communication.

[0085] The UE 802 and UE 804 may be configured to communicatively couple with a RAN 806. In embodiments, the RAN 806 may be NG-RAN, E-UTRAN, etc. The UE 802 and UE 804 utilize connections (or channels) (shown as connection 808 and connection 810, respectively) with the RAN 806, each of which comprises a physical communications interface. The RAN 806 can include one or more network devices, such as base station 812 and base station 814, that enable the connection 808 and connection 810.

[0086] In this example, the connection 808 and connection 810 are air interfaces to enable such communicative coupling and may be consistent with RAT(s) used by the RAN 806, such as, for example, an LTE and / or NR.

[0087] In some embodiments, the UE 802 and UE 804 may also directly exchange communication data via a sidelink interface 816. The UE 804 is shown to be configured to access an access point (shown as AP 818) via connection 820. By way of example, the connection 820 can comprise a local wireless connection, such as a connection consistent with any IEEE 802.11 protocol, wherein the AP 818 may comprise a Wi-Fi® router. In this example, the AP 818 may be connected to another network (for example, the Internet) without going through a CN 824.

[0088] In embodiments, the UE 802 and UE 804 can be configured to communicate using orthogonal frequency division multiplexing (OFDM) communication signals with each other or with the base station 812 and / or the base station 814 over a multicarrier communication channel in accordance with various communication techniques, such as, but not limited to, an orthogonalfrequency division multiple access (OFDMA) communication technique (e.g., for downlink communications) or a single carrier frequency division multiple access (SC-FDMA) communication technique (e.g., for uplink and ProSe or sidelink communications), although the scope of the embodiments is not limited in this respect. The OFDM signals can comprise a plurality of orthogonal subcarriers.

[0089] In some embodiments, all or parts of the base station 812 or base station 814 may be implemented as one or more software entities running on server computers as part of a virtual network. In addition, or in other embodiments, the base station 812 or base station 814 may be configured to communicate with one another via interface 822. In embodiments where the wireless communication system 800 is an LTE system (e.g., when the CN 824 is an EPC), the interface 822 may be an X2 interface. The X2 interface may be defined between two or more network devices of a RAN (e.g., two or more eNBs and the like) that connect to an EPC, and / or between two eNBs connecting to the EPC. In embodiments where the wireless communication system 800 is an NR system (e.g., when CN 824 is a 5GC), the interface 822 may be an Xn interface. The Xn interface is defined between two or more network devices of a RAN (e.g., two or more gNBs and the like) that connect to the 5GC, between a base station 812 (e.g., a gNB) connecting to the 5GC and an eNB, and / or between two eNBs connecting to the 5GC (e.g., CN 824).

[0090] The RAN 806 is shown to be communicatively coupled to the CN 824. The CN 824 may comprise one or more network elements 826, which are configured to offer various data and telecommunications services to customers / subscribers (e.g., users of UE 802 and UE 804) who are connected to the CN 824 via the RAN 806. The components of the CN 824 may be implemented in one physical device or separate physical devices including components to read and execute instructions from a machine-readable or computer-readable medium (e.g., a non- transitory machine-readable storage medium).

[0091] In embodiments, the CN 824 may be an EPC, and the RAN 806 may be connected with the CN 824 via an SI interface 828. In embodiments, the SI interface 828 may be split into two parts, an SI user plane (Sl-U) interface, which carries traffic data between the base station 812 or base station 814 and a serving gateway (S-GW), and the Sl-MME interface, which is a signaling interface between the base station 812 or base station 814 and mobility management entities (MMEs).

[0092] In embodiments, the CN 824 may be a 5GC, and the RAN 806 may be connected with the CN 824 via an NG interface 828. In embodiments, the NG interface 828 may be split into two parts, an NG user plane (NG-U) interface, which carries traffic data between the base station812 or base station 814 and a user plane function (UPF), and the SI control plane (NG-C) interface, which is a signaling interface between the base station 812 or base station 814 and access and mobility management functions (AMFs).

[0093] Generally, an application server 830 may be an element offering applications that use internet protocol (IP) bearer resources with the CN 824 (e.g., packet switched data services). The application server 830 can also be configured to support one or more communication services (e.g., VoIP sessions, group communication sessions, etc.) for the UE 802 and UE 804 via the CN 824. The application server 830 may communicate with the CN 824 through an IP communications interface 832.

[0094] FIG. 9 illustrates an example system 900 for performing signaling 938 between a wireless device 902 and a network device 920, according to embodiments described herein. The system 900 may be a portion of a wireless communication system as herein described. The wireless device 902 may be, for example, a UE of a wireless communication system. The network device 920 may be, for example, a base station (e.g., an eNB or a gNB) or a radio head of a wireless communication system.

[0095] The wireless device 902 may include one or more processor(s) 904. The processor(s) 904 may execute instructions such that various operations of the wireless device 902 are performed, as described herein. The processor(s) 904 may include one or more baseband processors implemented using, for example, a central processing unit (CPU), a digital signal processor (DSP), an application specific integrated circuit (ASIC), a controller, a field programmable gate array (FPGA) device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.

[0096] The wireless device 902 may include a memory 906. The memory 906 may be a non- transitory computer-readable storage medium that stores instructions 908 (which may include, for example, the instructions being executed by the processor(s) 904). The instructions 908 may also be referred to as program code or a computer program. The memory 906 may also store data used by, and results computed by, the processor(s) 904.

[0097] The wireless device 902 may include one or more transceiver(s) 910 (also collectively referred to as a transceiver 910) that may include radio frequency (RF) transmitter and / or receiver circuitry that use the antenna(s) 912 of the wireless device 902 to facilitate signaling (e.g., the signaling 938) to and / or from the wireless device 902 with other devices (e.g., the network device 920) according to corresponding RATs. The wireless device 902 may also include a LP-WUR 914 that enables the wireless device 902 to detect and / or measure, using the antenna(s) 912, a LP-WUS received from one or more other devices.

[0098] The wireless device 902 may include one or more antenna(s) 912 (e.g., one, two, four, eight, or more). For embodiments with multiple antenna(s) 912, the wireless device 902 may leverage the spatial diversity of such multiple antenna(s) 912 to send and / or receive multiple different data streams on the same time and frequency resources. This behavior may be referred to as, for example, MIMO behavior (referring to the multiple antennas used at each of a transmitting device and a receiving device that enable this aspect). MIMO transmissions by the wireless device 902 may be accomplished according to precoding (or digital beamforming) that is applied at the wireless device 902 that multiplexes the data streams across the antenna(s) 912 according to known or assumed channel characteristics such that each data stream is received with an appropriate signal strength relative to other streams and at a desired location in the spatial domain (e.g., the location of a receiver associated with that data stream). Some embodiments may use single user MIMO (SU-MIMO) methods (where the data streams are all directed to a single receiver) and / or multi-user MIMO (MU-MIMO) methods (where individual data streams may be directed to individual (different) receivers in different locations in the spatial domain).

[0099] In some embodiments having multiple antennas, the wireless device 902 may implement analog beamforming techniques, whereby phases of the signals sent by the antenna(s) 912 are relatively adjusted such that the (joint) transmission of the antenna(s) 912 can be directed (this is sometimes referred to as beam steering).

[0100] The wireless device 902 may include one or more interface(s) 916. The interface(s) 916 may be used to provide input to or output from the wireless device 902. For example, a wireless device 902 that is a UE may include interface(s) 916 such as microphones, speakers, a touchscreen, buttons, and the like in order to allow for input and / or output to the UE by a user of the UE. Other interfaces of such a UE may be made up of transmitters, receivers, and other circuitry (e.g., other than the transceiver(s) 910 / antenna(s) 912 already described) that allow for communication between the UE and other devices and may operate according to known protocols (e.g., Wi-Fi®, Bluetooth®, and the like).

[0101] The wireless device 902 may include low power reference signal (LP-RS) measurement module(s) 918. The LP-RS measurement module(s) 918 may be implemented via hardware, software, or combinations thereof. For example, the LP-RS measurement module(s) 918 may be implemented as a processor, circuit, and / or instructions 908 stored in the memory 906 and executed by the processor(s) 904. In some examples, the LP-RS measurement module(s) 918 may be integrated within the processor(s) 904 and / or the transceiver(s) 910. For example, the LP-RS measurement module(s) 918 may be implemented by a combination of softwarecomponents (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the processor(s) 904 or the transceiver(s) 910.

[0102] The LP-RS measurement module(s) 918 may be used for various aspects of the present disclosure, for example, aspects of FIGs. 1-9, from a wireless device or UE perspective. The LP- RS measurement module(s) 918 may be configured to, for example, determine, while operating in the lower power state and based at least in part on whether the power measurement of the reference signal satisfies the signal power condition, whether to perform a UE mobility operation. The LP-WUR 914 can be used for receiving LP-RS, such as LP-SS and / or LP-WUS, from the network device 920 or another network device operating as a LP-WUT.

[0103] The network device 920 may include one or more processor(s) 922. The processor(s) 922 may execute instructions such that various operations of the network device 920 are performed, as described herein. The processor(s) 922 may include one or more baseband processors implemented using, for example, a CPU, a DSP, an ASIC, a controller, an FPGA device, another hardware device, a firmware device, or any combination thereof configured to perform the operations described herein.

[0104] The network device 920 may include a memory 924. The memory 924 may be a non- transitory computer-readable storage medium that stores instructions 926 (which may include, for example, the instructions being executed by the processor(s) 922). The instructions 926 may also be referred to as program code or a computer program. The memory 924 may also store data used by, and results computed by, the processor(s) 922.

[0105] The network device 920 may include one or more transceiver(s) 928 (also collectively referred to as a transceiver 928) that may include RF transmitter and / or receiver circuitry that use the antenna(s) 930 of the network device 920 to facilitate signaling (e.g., the signaling 938) to and / or from the network device 920 with other devices (e.g., the wireless device 902) according to corresponding RATs.

[0106] The network device 920 may include one or more antenna(s) 930 (e.g., one, two, four, or more). In embodiments having multiple antenna(s) 930, the network device 920 may perform MIMO, digital beamforming, analog beamforming, beam steering, etc., as has been described.

[0107] The network device 920 may include one or more interface(s) 932. The interface(s) 932 may be used to provide input to or output from the network device 920. For example, a network device 920 of a RAN (e.g., a base station, a radio head, etc.) may include interface(s) 932 made up of transmitters, receivers, and other circuitry (e.g., other than the transceiver(s) 928 / antenna(s) 930 already described) that enables the network device 920 to communicate withother equipment in a network, and / or that enables the network device 920 to communicate with external networks, computers, databases, and the like for purposes of operations, administration, and maintenance of the network device 920 or other equipment operably connected thereto.

[0108] The network device 920 may include one or more LP-RS measurement configuration module(s) 934. The LP-RS measurement configuration module(s) 934 may be implemented via hardware, software, or combinations thereof. For example, the LP-RS measurement configuration module(s) 934 may be implemented as a processor, circuit, and / or instructions 926 stored in the memory 924 and executed by the processor(s) 922. In some examples, the LP-RS measurement configuration module(s) 934 may be integrated within the processor(s) 922 and / or the transceiver(s) 928. For example, the LP-RS measurement configuration module(s) 934 may be implemented by a combination of software components (e.g., executed by a DSP or a general processor) and hardware components (e.g., logic gates and circuitry) within the processor(s) 922 or the transceiver(s) 928.

[0109] The LP-RS measurement configuration module(s) 934 may be used for various aspects of the present disclosure, for example, aspects of FIGs. 1-9, from a network device perspective. The LP-RS measurement configuration module(s) 934 may be configured to, for example, configure the wireless device 902 to use the LP-WUR 914 for LP-RS measurement, and / or to transmit one or more reference signals (e.g., LP-SS and / or LP-WUS) to the wireless device 902.

[0110] For one or more embodiments, at least one of the components set forth in one or more of the preceding figures may be configured to perform one or more operations, techniques, processes, and / or methods as set forth herein. For example, a baseband processor (or processor) as described herein in connection with one or more of the preceding figures may be configured to operate in accordance with one or more of the examples set forth herein. For another example, circuitry associated with a UE, network device, network element, etc. as described above in connection with one or more of the preceding figures may be configured to operate in accordance with one or more of the examples set forth herein.

[0111] Any of the above described embodiments may be combined with any other embodiment (or combination of embodiments), unless explicitly stated otherwise. The foregoing description of one or more implementations provides illustration and description but is not intended to be exhaustive or to limit the scope of embodiments to the precise form described. Modifications and variations are possible in light of the above teachings or may be acquired from practice of various embodiments.

[0112] Embodiments and implementations of the systems and methods described herein may include various operations, which may be embodied in machine-executable instructions to beexecuted by a computer system. A computer system may include one or more general-purpose or special -purpose computers (or other electronic devices). The computer system may include hardware components that include specific logic for performing the operations or may include a combination of hardware, software, and / or firmware.

[0113] The systems described herein pertain to specific embodiments but are provided as examples. These embodiments can be combined into single systems, partially combined into other systems, split into multiple systems or divided or combined in other ways. In addition, it is contemplated that parameters, attributes, aspects, etc. of one embodiment can be used in another embodiment. The parameters, attributes, aspects, etc. are merely described in one or more embodiments for clarity, and it is recognized that the parameters, attributes, aspects, etc. can be combined with or substituted for parameters, attributes, aspects, etc. of another embodiment unless specifically disclaimed herein.

[0114] It is well understood that the use of personally identifiable information should follow privacy policies and practices that are generally recognized as meeting or exceeding industry or governmental requirements for maintaining the privacy of users. In particular, personally identifiable information data should be managed and handled so as to minimize risks of unintentional or unauthorized access or use, and the nature of authorized use should be clearly indicated to users.

[0115] Although the foregoing has been described in some detail for purposes of clarity, it will be apparent that changes and modifications may be made without departing from the principles thereof. It should be noted that there are many alternative ways of implementing both the processes and apparatuses described herein. Accordingly, the present embodiments are to be considered illustrative and not restrictive, and the description is not to be limited to the details given herein but may be modified within the scope and equivalents of the appended claims.

Claims

CLAIMS1. A user equipment (UE), comprising: a transceiver associated with a main radio; a low power wake-up radio (LP-WUR); and a processor configured to cause the UE to, while the transceiver is operating in a lower power state, receive, via the LP-WUR, a reference signal associated with a low power wakeup transmitter; determine whether a power measurement of the reference signal satisfies a signal power condition for UE mobility; and determine, while operating in the lower power state and based at least in part on whether the power measurement of the reference signal satisfies the signal power condition, whether to perform a UE mobility operation.

2. The UE of claim 1 , wherein: the signal power condition comprises a signal power range corresponding to a serving cell; and the processor is configured to cause the UE to perform the UE mobility operation by being configured to perform, based at least in part on the power measurement of the reference signal satisfying the signal power range corresponding to the serving cell, a cell reselection procedure to the serving cell.

3. The UE of claim 2, wherein the processor is further configured to cause the UE to identify the serving cell based at least in part on the signal power range corresponding to a single serving cell.

4. The UE of claim 2, wherein the reference signal comprises a first reference signal, and the processor is further configured to cause the UE to: identify a group of serving cells, including the serving cell, based at least in part on the signal power range corresponding to the group of serving cells; and select the serving cell from the group of serving cells based at least in part on one or more power measurements of a second reference signal received via the transceiver associated with the main radio.

5. The UE of claim 1 , wherein: the signal power condition comprises a signal power range corresponding to a serving cell; the reference signal comprises a first reference signal; and the processor is configured to cause the UE to perform the UE mobility operation by being configured to provide, based at least in part on the power measurement of the first reference signal satisfying the signal power range, an indication for the transceiver to operate in a higher power state to perform a cell reselection procedure using one or more power measurements of a second reference signal received via the transceiver associated with the main radio.

6. The UE of claim 1 , wherein: the signal power condition comprises a power variation threshold; the reference signal comprises a first reference signal; and the processor is configured to cause the UE to perform the UE mobility operation by being configured to provide, based at least in part on a power variation for the power measurement of the first reference signal satisfying the power variation threshold, an indication for the transceiver to operate in a higher power state to perform a cell reselection procedure using one or more power measurements of a second reference signal received via the transceiver associated with the main radio.

7. The UE of claim 1, wherein: the signal power condition comprises a signal power difference between a first serving cell and a second serving cell; the reference signal comprises a first reference signal; and the processor is configured to cause the UE to perform the UE mobility operation by being configured to provide, based at least in part on the power measurement of the first reference signal satisfying the signal power difference, an indication for the transceiver to operate in a higher power state to perform a cell reselection procedure using one or more power measurements of a second reference signal received via the transceiver associated with the main radio.

8. The UE of claim 1, wherein the processor is further configured to cause the UE to:receive configuration information indicating a correspondence between a set of signal power ranges and a set of cell identifiers; and identifying at least a serving cell for the UE mobility operation based at least in part on the configuration information.

9. The UE of claim 1 , wherein the power measurement is a reference signal received power (RSRP) measurement, a reference signal received quality (RSRQ) measurement, or a signal-to- interference-plus-noise ratio (SINR) measurement.

10. The UE of claim 1, wherein the reference signal associated with the low power wake-up transmitter comprises a low power synchronization signal (LP-SS) or a low power wake-up signal (LP-WUS).

11. A network device, comprising: a transceiver; and a processor configured to cause the network device to: transmit, to a user equipment (UE) and via the transceiver, configuration information indicating a correspondence between a set of signal power ranges and a set of cell identifiers, the set of signal power ranges indicating a network preference for the UE to perform a UE mobility operation based at least in part on whether a power measurement of a reference signal received via a low power wake-up radio (LP-WUR) of the UE satisfies a signal power condition for UE mobility; and transmit the reference signal.

12. The network device of claim 11 , wherein each signal power range of the set of signal power ranges corresponds to a single serving cell of the set of serving cells.

13. The network device of claim 11 , wherein at least one signal power range of the set of signal power ranges corresponds to a plurality of serving cells of the set of serving cells.

14. A method of wireless communication at a user equipment (UE), comprising: receiving, via a low power wake-up radio (LP-WUR) of the UE, a reference signal associated with a low power wake-up transmitter; determining whether a power measurement of the reference signal satisfies a signal power condition for UE mobility; anddetermining, while operating in the lower power state, whether to perform a UE mobility operation based at least in part on whether the power measurement of the reference signal satisfies the signal power condition.

15. The method of claim 14, further comprising: performing a cell reselection procedure to a serving cell based at least in part on the power measurement of the reference signal satisfying a signal power range corresponding to the serving cell, wherein the signal power condition comprises the signal power range corresponding to the serving cell, and the UE mobility operation comprising the cell reselection procedure.

16. The method of claim 15, further comprising: identifying the serving cell based at least in part on the signal power range corresponding to a single serving cell.

17. The method of claim 15, wherein the reference signal comprises a first reference signal, and the method further comprises: identifying a group of serving cells, including the serving cell, based at least in part on the signal power range corresponding to the group of serving cells; and selecting the serving cell from the group of serving cells based at least in part on one or more power measurements of a second reference signal received via a transceiver associated with the main radio of the UE.

18. The method of claim 14, further comprising: performing a cell reselection procedure to a serving cell based at least in part on the power measurement of the reference signal satisfying a signal power range corresponding to the serving cell, wherein the signal power condition comprises the signal power range corresponding to the serving cell, and the UE mobility operation comprising the cell reselection procedure.

19. The method of claim 14, wherein the reference signal comprises a first reference signal, and the method further comprises: providing, to a transceiver of the UE and based at least in part on a power variation for the power measurement of the first reference signal satisfying a power variation threshold, an indication for the transceiver of the UE to operate in a higher power state to perform a cell reselection procedure using one or more power measurements of a second reference signal received via the transceiver associated with the main radio, wherein the signal power conditioncomprises the power variation threshold, and the UE mobility operation comprising the cell reselection procedure.

20. The method of claim 14, wherein the reference signal comprises a first reference signal, and the method further comprises: providing, to a transceiver of the UE and based at least in part on the power measurement of the first reference signal satisfying a signal power difference between a first serving cell and a second serving cell, an indication for the transceiver of the UE to operate in a higher power state to perform a cell reselection procedure using one or more power measurements of a second reference signal received via the transceiver associated with the main radio, wherein the signal power condition comprises the a signal power difference, and the UE mobility operation comprising the cell reselection procedure.

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