WO2022007844A1 - Mécanisme de radiorecherche à faible consommation d'énergie avec indicateur précoce de radiorecherche (pei) à base d'une séquence - Google Patents

Mécanisme de radiorecherche à faible consommation d'énergie avec indicateur précoce de radiorecherche (pei) à base d'une séquence Download PDF

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Publication number
WO2022007844A1
WO2022007844A1 PCT/CN2021/104997 CN2021104997W WO2022007844A1 WO 2022007844 A1 WO2022007844 A1 WO 2022007844A1 CN 2021104997 W CN2021104997 W CN 2021104997W WO 2022007844 A1 WO2022007844 A1 WO 2022007844A1
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Prior art keywords
pei
paging
sequence
indicates
monitoring
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PCT/CN2021/104997
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English (en)
Inventor
Chi-Hsuan Hsieh
Yi-ju LIAO
Wei-De Wu
Li-Chuan Tseng
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Mediatek Inc.
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Publication of WO2022007844A1 publication Critical patent/WO2022007844A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H04W52/0235—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal where the received signal is a power saving command
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/02—Arrangements for increasing efficiency of notification or paging channel
    • H04W68/025—Indirect paging
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like
    • H04W68/005—Transmission of information for alerting of incoming communication
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the disclosed embodiments relate generally to wireless communication systems, and, more particularly, to power efficient paging mechanism with sequence-based paging early indicator (PEI) .
  • PEI sequence-based paging early indicator
  • 3GPP and 5G new radio (NR) mobile telecommunication systems provide high data rate, lower latency and improved system performances.
  • 5G terrestrial NR access network includes a plurality of base stations, e.g., next generation Node-Bs (gNBs) , communicating with a plurality of mobile stations referred as user equipment (UEs) .
  • gNBs next generation Node-Bs
  • UEs user equipment
  • OFDMA Orthogonal frequency division multiple access
  • OFDMA has been selected for NR downlink (DL) radio access scheme due to its robustness to multipath fading, higher spectral efficiency, and bandwidth scalability.
  • Multiple access in the downlink is achieved by assigning different sub-bands (i.e., groups of subcarriers, denoted as resource blocks (RBs) ) of the system bandwidth to individual users based on their existing channel condition.
  • RBs resource blocks
  • physical downlink control channel PDCCH
  • PDSCH physical downlink shared channel
  • PUCCH physical uplink control channel
  • PUSCH physical uplink shared channel
  • PRACH physical random-access channel
  • Paging is a procedure the wireless network uses to find out the location of a UE, before the actual connection establishment. For example, paging may be used to alert the UE of an incoming session (call) . In most cases, the paging process happens while UE is in radio resource control (RRC) idle mode. This means that UE has to monitor whether the network is sending any paging message to it and it has to spend some energy to run this “monitoring” process. In RRC idle mode, a UE gets into and stays in a sleep mode defined in discontinuous reception (DRX) cycle.
  • DRX discontinuous reception
  • the UE periodically wakes up and monitors PDCCH to check for the presence of a paging message. If the PDCCH indicates that a paging message is transmitted in a subframe, then the UE demodulates the paging channel to see if the paging message is directed to it.
  • paging reception consumes less than 2.5%of the total power.
  • SSB synchronization signal block
  • LOOP operations including automatic gain control (AGC) , frequency tracking loop (FTL) , and time tracking loop (TTL)
  • MEAS measurements
  • the gap between the SSBs for LOOP/MEAS and paging occasion (PO) is longer, and UE may enter light sleep mode in the gap. If there is an indication before paging and UE monitors PO only if paging is indicated, then UE can save power consumption not only for paging reception, but also for the light sleep between the last SSB and PO gap. Therefore, a solution is sought to enable more UE power saving with indication before paging.
  • a method of providing sequence-based early paging indicator (PEI) for power consumption enhancements in a 5G/NR network is proposed.
  • a UE Under the novel paging reception procedure with a PEI, a UE receives paging configuration from a base station in a wireless communication system, and monitors a PEI according to the paging configuration.
  • the UE can skip Paging Occasion (PO) monitoring if the PEI indicates there is no paging for the PO in the corresponding PF.
  • PO Paging Occasion
  • the UE’s main receiver is typically turned on in every paging cycle, for LOOP, MEAS, and PEI reception.
  • UE can turn off its main receiver to enter a sleep mode (e.g., deep sleep) right after the reception of PEI. Therefore, power saving can be achieved not only for PO monitoring but also for light sleep between the last SSB/PEI and the PO monitoring gap and state transitions, when the UE is not paged.
  • a sleep mode e.g., deep sleep
  • the PEI comprises a secondary synchronization signal (SSS) sequence.
  • the PEI comprises a tracking reference signal (TRS) sequence.
  • the UE descrambles the SSS sequence using one or more sequence identifiers (IDs) for PEI detection, or descrambles the TRS sequence using one or more scrambling IDs for PEI detection.
  • IDs sequence identifiers
  • scrambling IDs are selected based on a tracking area that the UE is in.
  • the PEI is for a single PO. In another embodiment, the PEI is for multiple POs, and thus, the PEI further indicates whether there is a paging for a second PO in a corresponding second PF.
  • the UE monitors the second PO in the corresponding second PF when the first PEI indicates there is a paging for the second PO in the corresponding second PF, or enters the sleep mode from an end of the corresponding first PF to the corresponding second PF when the first PEI indicates there is no paging for the second PO in the corresponding second PF.
  • the PEI is monitored based on a PEI offset that indicates a number of radio frames prior to the first PO, wherein the PEI offset is indicated in the paging configuration or is predefined in a 3GPP technical specification (TS) for a radio access technology (RAT) utilized by the wireless communication network.
  • TS 3GPP technical specification
  • RAT radio access technology
  • the first PEI is monitored in a time location near a Synchronization Signal Block (SSB) .
  • the first PEI may be monitored on a plurality of beams in multi-beam operations.
  • the frequency location of the first PEI may be where an SSS of an SSB is scheduled, or may be determined based on a paging search space.
  • multiple PEIs for different POs may be Code Division Multiplexed (CDMed) or Frequency Division Multiplexed (FDMed) in the same time location.
  • CDMed Code Division Multiplexed
  • FDMed Frequency Division Multiplexed
  • Figure 1 illustrates a procedure of paging reception with paging early indicator (PEI) in a 5G new radio (NR) network 100 in accordance with one novel aspect of the present invention.
  • PEI paging early indicator
  • FIG. 2 is a simplified block diagram of wireless devices 201 and 211 in accordance with embodiments of the present invention.
  • Figure 3 illustrates the concept of providing PEI for additional power saving during paging reception in accordance with one novel aspect of the present invention.
  • Figure 4 illustrates one embodiment of describing PEI location using frame-level offset for each PF/PO in accordance with one novel aspect of the present invention.
  • FIG. 5 illustrates the generation of an SSS-sequence-based PEI in accordance with one novel aspect of the present invention.
  • Figure 6 illustrates exemplary time and frequency locations of SSS-sequence-based PEIs in accordance with one novel aspect of the present invention.
  • Figure 7 illustrates exemplary time and frequency locations of SSS-sequence-based PEIs with FDMed in accordance with one novel aspect of the present invention.
  • Figure 8 illustrates the generation of a TRS-sequence-based PEI in accordance with one novel aspect of the present invention.
  • Figure 9 illustrates exemplary time and frequency locations of TRS-sequence-based PEIs in accordance with one novel aspect of the present invention.
  • Figure 10 illustrates exemplary time and frequency locations of TRS-sequence-based PEIs with FDMed in accordance with one novel aspect of the present invention.
  • Figure 11 illustrates a message flow of a paging reception and connection establishment procedure in accordance with one novel aspect of the present invention.
  • Figure 12 is a flow chart of a method of providing sequence-based PEI for power consumption enhancements from UE perspective in a 5G/NR network in accordance with one novel aspect of the present invention.
  • Figure 13 is a flow chart of a method of providing sequence-based PEI for power consumption enhancements from network perspective in a 5G/NR network in accordance with one novel aspect of the present invention.
  • Figure 1 illustrates a procedure of paging reception with paging early indicator (PEI) in a 5G new radio (NR) network 100 in accordance with one novel aspect of the present invention.
  • a 5G NR access network which includes a plurality of base stations, e.g., Next Generation Node-Bs (gNBs) , communicates with a plurality of mobile stations referred as user equipment (UEs) .
  • gNBs Next Generation Node-Bs
  • UEs user equipment
  • OFDMA Orthogonal frequency division multiple access
  • physical downlink control channel (PDCCH) is used for downlink scheduling.
  • Physical downlink shared channel (PDSCH) is used for downlink data.
  • physical uplink control channel (PUCCH) is used for carrying uplink control information.
  • Physical uplink shared channel (PUSCH) is used for uplink data.
  • physical random-access channel (PRACH) is used for contention-based and non-contention-based RACH.
  • Paging is a procedure the wireless network uses to find out the location of a UE, before the actual connection establishment. For example, paging is used to alert the UE of an incoming session (call) . In most cases, the paging process happens while UE is in radio resource control (RRC) idle mode. This means that UE has to monitor whether the networking is sending any paging message to it and it has to spend some energy to run this “monitoring” process. In RRC idle mode, a UE gets into and stays in a sleep mode defined in discontinuous reception (DRX) cycle.
  • DRX discontinuous reception
  • the UE periodically wakes up and monitors PDCCH to check for the presence of a paging message. If the PDCCH indicates that a paging message is transmitted in a subframe, then the UE demodulates the signal received on the paging channel to see if the paging message is directed to it.
  • paging reception consumes less than 2.5%of the total power.
  • SSB synchronization signal block
  • LOOP operations including automatic gain control (AGC) , frequency tracking loop (FTL) , and time tracking loop (TTL)
  • MEAS measurements
  • AGC automatic gain control
  • FTL frequency tracking loop
  • TTL time tracking loop
  • MEAS measurements
  • there is some gap between the SSBs for LOOP/MEAS and paging occasion (PO) and UE may enter light sleep mode in the gap. If there is an indication before paging and UE monitors PO only if paging is indicated, then UE can save power consumption not only for paging reception, but also for the light sleep between the last SSB and PO gap. Note that in light sleep mode, UE does not fully turn off its receiver, and thus the power consumption is higher than that in deep sleep mode, but lower than normal mode. Compared to deep sleep mode, light sleep mode requires less transition power to/from normal mode.
  • an indication before paging e.g., sequence-based paging early indicator (PEI)
  • PEI sequence-based paging early indicator
  • top diagram 110 depicts a paging reception procedure without PEI
  • bottom diagram 120 depicts a paging reception procedure with PEI.
  • a group of UEs can be associated with the same PO.
  • UE periodically wakes up and performs paging PDCCH decoding (111) , if no UE in the UE group is paged, then UE stops paging PDCCH decoding and enters light sleep mode.
  • UE performs paging PDSCH decoding (112) . If the UE itself is not paged, then UE stops paging PDSCH decoding and enters deep sleep mode. Otherwise, UE performs connection establishment (113) .
  • UE periodically wakes up and checks for PEI first (121) , if no UE in the UE group is paged, then UE stops PEI monitoring and enters deep sleep mode. Otherwise, if a UE in the UE group is paged, UE performs paging PDCCH decoding (122) as well as paging PDSCH decoding (123) . If the UE itself is not paged, then UE stops paging PDSCH decoding and enters deep sleep mode. Otherwise, if the UE itself is paged, UE performs connection establishment (124) .
  • UE can skip PO monitoring if the detected PEI indicates no paging (i.e., there is no paging for the PO in the corresponding paging frame (PF) ) , or if no PEI is detected in step 121.
  • the UE’s main receiver is turned on in every paging cycle, for LOOP, MEAS, and PEI reception. If PEI indicates no paging, then after performing required measurements, UE can turn off its main receiver or a part of receiver/component and enters deep sleep mode until the next PEI. Note that UE is required to perform intra-frequency or inter-frequency measurements when signal quality of the serving cell is below certain threshold.
  • UE performs the required measurements when it wakes up for paging monitoring (i.e., every paging cycle) , then UE will stay in deep sleep mode until next PEI. Since PEIs expected to be transmitted are located near SSB bursts, power saving can be achieved not only for PO monitoring but also for light sleep between the last SSB/PEI and the PO monitoring gap and state transitions (e.g., the power mode transition from/to normal mode to/from light sleep mode) , when no UE in the UE group is paged.
  • paging monitoring i.e., every paging cycle
  • FIG. 2 is a simplified block diagram of wireless devices 201 and 211 in accordance with embodiments of the present invention.
  • wireless device 201 e.g., a base station
  • antennae 205 and 206 transmit and receive radio signal.
  • RF transceiver module 204 coupled with the antennae 205 and 206, receives RF signals from the antennae 205 and 206, converts them to baseband signals and sends them to processor 203.
  • RF transceiver 204 also converts received baseband signals from the processor 203, converts them to RF signals, and sends out to antennae 205 and 206.
  • Processor 203 processes the received baseband signals and invokes different functional modules and circuits 207 to perform features in wireless device 201.
  • Memory 202 stores program instructions and data 221 to control the operations of wireless device 201.
  • antennae 215 and 216 transmit and receive RF signals.
  • RF transceiver module 214 coupled with the antennae 215 and 216, receives RF signals from the antennae 215 and 216, converts them to baseband signals and sends them to processor 213.
  • the RF transceiver 214 also converts received baseband signals from the processor 213, converts them to RF signals, and sends out to antennae 215 and 216.
  • Processor 213 processes the received baseband signals and invokes different functional modules and circuits 217 to perform features in wireless device 211.
  • Memory 212 stores program instructions and data 231 to control the operations of the wireless device 211.
  • wireless device 201 is a base station that includes an RRC connection handling module 222, a scheduler 223, a paging and mobility management module 224, and a control and configuration circuit 225.
  • Wireless device 211 is a UE that includes a connection handling module 232, a measurement and reporting module 233, a paging and mobility handling module 234, and a control and configuration circuit 235. Note that a wireless device may be both a transmitting device and a receiving device.
  • the different functional modules and circuits can be implemented and configured by software, firmware, hardware, and any combination thereof.
  • the function modules and circuits when executed by the processors 203 and 213 (e.g., via executing program codes 221 and 231) , allow base station 201 and user equipment 211 to perform embodiments of the present invention.
  • the base station 201 establishes an RRC connection with the UE 211 via RRC connection handling circuit 222, schedules downlink and uplink transmission for UEs via scheduler 223, performs paging (including sending PEI) , mobility, and handover management via mobility management module 224, and provides paging, measurement, and measurement reporting configuration information to UEs via configuration circuit 225.
  • the UE 211 handles RRC connection via RRC connection handling circuit 232, performs measurements and reports measurement results via measurement and reporting module 233, performs paging monitoring (including PEI monitoring) and mobility via paging and mobility handling module 234, and obtains configuration information via control and configuration circuit 235.
  • UE 211 receives paging configuration for PEI and monitors PEI during a PEI-carrying frame.
  • the paging configuration may be included in the “PCCH-Config” Information Element (IE) of a System Information Block type 1 (SIB1) .
  • IE PCCH-Config Information Element
  • SIB1 System Information Block type 1
  • UE 211 can skip PO monitoring if PEI indicates no paging, to achieve power saving for PO monitoring and between the PEI and the PO monitoring gap.
  • Figure 3 illustrates the concept of providing PEI for additional power saving during paging reception in accordance with one novel aspect of the present invention.
  • Diagram 310 of Figure 3 depicts the SSB transmission scheme in NR, where LOOP operations (including AGC, FTL, and TTL) and measurements (MEAS) can only be performed in certain occasions, e.g., during SSB bursts.
  • UE wakes up for SSBs, e.g., every 20ms (every 2 radio frames) .
  • UE may enter light sleep mode (e.g., a first power saving mode with higher power consumption) in the gap between the SSBs for LOOP/MEAS and PO.
  • light sleep mode e.g., a first power saving mode with higher power consumption
  • UE can skip PO monitoring, e.g., entering deep sleep mode (e.g., a second power saving mode with lower power consumption) in the gap between PEI and PO, if PEI indicates no page (i.e., there is no paging for the PO in the corresponding PF) .
  • deep sleep mode e.g., a second power saving mode with lower power consumption
  • Low-SINR UEs need to wake up earlier, i.e., monitor more SSB bursts (larger N SSB ) before being able to decode paging message.
  • High-SINR UEs may wake up later before PO monitoring. Therefore, if there is only one PEI for each PO, PEI needs to be relatively early in order to cover a wide range of SINR values since a PEI serves many UEs.
  • SMTC SSB measurement timing configuration
  • the location of PEI may be described in relation to each SMTC window.
  • PEIs expected to be transmitted are located near SSB bursts, thus aiming at power saving not only PO monitoring but also light sleep and state transitions, when no UE is paged. UE may need extra time for PEI monitoring in addition to SSB.
  • PEI is detected next to the SSB burst 321.
  • PEI indicates that there is no paging for the PO in the corresponding PF (i.e., no paging)
  • UE enters deep sleep in 322, e.g., entering deep sleep mode in the gap between PEI monitoring and PO.
  • PEI is not detected next to the SSB burst 331. Not detecting PEI in the location where it supposed to be would mean that there is no paging for the PO in the corresponding PF (i.e., no paging) , then UE enters deep sleep in 332, e.g., entering deep sleep mode in the gap between PEI monitoring and PO.
  • FIG. 4 illustrates one embodiment of describing PEI location using frame-level offset for each PF/PO in accordance with one novel aspect of the present invention.
  • PO refers to a subframe where there may be paging-radio network temporary identifier (P-RNTI) transmitted on PDCCH addressing the paging message
  • PF refers to a radio frame which may contain one or multiple POs.
  • P-RNTI paging-radio network temporary identifier
  • PEIs are located “near SSB” to avoid additional sleep/wakeup.
  • the offset between PO and PEI is varying, since a PF containing PO needs to be mapped to SSB-carrying frame.
  • the PEI is located near the Nth SSB burst before PF/PO.
  • the PEI is explicitly specified in paging configuration carried in broadcast message, by indicating the PEI offset for each PF/PO. For better flexibility and simpler interpretation, the second option of explicitly specifying the PEI offset is preferred.
  • a PF is calculated in a way similar to LTE, but the POs are not configured as subframes. Instead, the exact location of a PO is defined using paging PDCCH monitoring occasions:
  • the starting PDCCH monitoring occasion number of the (i_s+ 1) th PO is the (i_s+ 1) th value of the firstPDCCH-MonitoringOccasionOfPO parameter; otherwise, it is equal to i_s*S, where S is the number of transmitted SSBs. Therefore, it is proposed to specify the frame-level offset for each PF, and then UE determines the starting point PEI for each PO in the PF.
  • the frame-level PEI offset for each PF is defined as the number of radio frames between the PEI-carrying frame and the paging frame.
  • the PEI is transmitted in an SSB-carrying frame, or another frame near SSB.
  • a set of PEI offsets is broadcasted by the network, and the value of PEI offsets is determined by the number of radio frames in an SMTC period.
  • UE determines which offset to use (e.g. use offset [n] if its PF is the n-th frame in the SMTC period) , and subtracts the offset from the SFN of its PF to find the PEI-carrying frame.
  • the UE needs to derive the “index” of its PF in an SMTC period.
  • the PEI of the kth PF is located in the frameOffset-PEI [k] -th frame before the PF.
  • After applying the frame-level PEI offset, UE can find a SSB/PEI-carrying frame to monitor the PEI.
  • PEI secondary synchronization signal
  • TRS tracking reference signal
  • UE needs to perform synchronization for PEI monitoring and decoding in RRC idle mode.
  • a PEI serves a group of UEs with different serving beams. PEI needs to be repeated on multiple beams. The same PEIs repeated on multiple beams is referred to as a PEI burst.
  • FIG. 5 illustrates the generation of an SSS-sequence-based PEI in accordance with one novel aspect of the present invention.
  • the PEI for one PO may be assigned with one specific sequence ID (preferably > 1007) which corresponds to the NCell_ID field in SSS generation, and UE only needs to descramble for one possibility of sequence ID as assigned to detect the PEI.
  • the PEI may not be transmitted if there is no paging for the UE.
  • a PEI may be used to carry paging indication for multiple POs or multiple subgroups in one PO, and thus, multiple bits can be carried in one PEI by assigning multiple sequence IDs (i.e., NCell_ID) .
  • the PEI for one PO may be assigned with two separate sequence IDs to represent a positive or negative paging indication.
  • an offset may be configured (e.g., in the paging configuration indicated via broadcast message) or pre-defined (e.g., in a 3GPPP TS) for an SSS-sequence-based PEI which is located an offset before a PO in time domain, and the offset may be set a larger value to save pre-sync operation for SSB reception.
  • An example of the offset value may be set to 40ms ⁇ 80ms since 40ms ⁇ 80ms latency is relatively not sensitive in RRC idle mode, when compared to DRX cycle length (e.g., 1280ms) .
  • each PEI may be mapped to a time location near a specific SSB location.
  • the same PEI may be applied and Time Division Multiplexed (TDMed) or Frequency Division Multiplexed (FDMed) for each beam in multi-beam operations.
  • the frequency location of an SSS-sequence-based PEI may be pre-defined or configured to be the same as an SSS, or may be pre-defined or configured by reusing the paging search space, say defining a mapping of starting Resource Element (RE) of the PEI to one specific RE in the paging search space.
  • RE Resource Element
  • Figure 6 illustrates exemplary time and frequency locations of SSS-sequence-based PEIs in accordance with one novel aspect of the present invention.
  • the PEIs for different POs may be Code Division Multiplexed (CDMed) or FDMed in the same time location.
  • Figure 7 illustrates exemplary time and frequency locations of SSS-sequence-based PEIs with FDMed in accordance with one novel aspect of the present invention.
  • CDM different sequence IDs may be used in SSS generation.
  • the exact time location (e.g., symbol location in a slot) and the exact frequency location (e.g., the starting RB) of an SSS-sequence-based PEI may be pre-defined or configured.
  • a TRS sequence is a Non-Zero Power (NZP) -CSI-RS-ResourceSet configured with trs-Info IE and composed of 2 or 4 nzp-CSI-RS-Resource.
  • NZP Non-Zero Power
  • Periodic TRS can be configured with a periodicity of 10, 20, 40, or 80 ms.
  • the bandwidth is the minimum of 52 and resource blocks, or is equal to resource blocks.
  • a UE shall assume that the reference-signal sequence r (m) is defined by: where the pseudo-random sequence C (i) is defined in clause 5.2.1 of the 3GPP TS38.211.
  • the PEI for one PO may be assigned with one specific scrambling ID which corresponds to the ScramblingId field in TRS generation, and UE only needs to descramble for one possibility of scrambling ID as assigned to detect the PEI.
  • the PEI may not be transmitted if there is no paging for the UE.
  • a PEI may be used to carry paging indication for multiple POs or multiple subgroups in one PO, and thus, multiple bits can be carried in one PEI by assigning multiple scrambling IDs.
  • the PEI for one PO may be assigned with two separate scrambling IDs to represent a positive or negative paging indication.
  • an offset may be configured (e.g., in the paging configuration indicated via broadcast message) or pre-defined (e.g., in a 3GPPP TS) for a TRS-sequence-based PEI which is located an offset before a PO in time domain, and the offset may be set a larger value to save pre-sync operation for SSB reception.
  • An example of the offset value may be set to 40ms ⁇ 80ms since 40ms ⁇ 80ms latency is relatively not sensitive in RRC idle mode, when compared to DRX cycle length (e.g., 1280ms) .
  • each PEI may be mapped to a time location near a specific SSB location.
  • the same PEI may be applied and TDMed/FDMed for each beam in multi-beam operations.
  • the frequency location of a TRS-sequence-based PEI may be pre-defined or configured (similar to the example of Figure 6) to be the same as an SSS, or may be pre-defined or configured by reusing the paging search space, say defining a mapping of starting RE of the PEI to one specific RE in the paging search space.
  • Figure 9 illustrates exemplary time and frequency locations of TRS-sequence-based PEIs in accordance with one novel aspect of the present invention.
  • the PEIs for different POs may be CDMed/FDMed in the same time location.
  • Figure 10 illustrates exemplary time and frequency locations of TRS-sequence-based PEIs with FDMed in accordance with one novel aspect of the present invention.
  • different scrambles ID may be used in TRS generation.
  • the exact time location e.g., firstOFDMSymbolInTimeDomain in a slot
  • the exact frequency location e.g., the starting RB and the number of RBs
  • the exact frequency location of a TRS-sequence-based PEI may be pre-defined or configured.
  • FIG. 11 illustrates a message flow of a paging reception and connection establishment procedure in accordance with one novel aspect of the present invention.
  • UE 1101 reports to the network 1102 its minimum required gap between PO and corresponding PEI as UE capability.
  • UE 1101 receives a broadcast message containing paging configuration. The paging configuration indicates whether and where the network sends PEI and paging messages.
  • UE 1101 monitors PEI at pre-defined locations and performs measurements. A group of UEs associated with the same PO monitors the same PEI, which corresponds to a PO, or to multiple POs monitored by the same group of UEs.
  • the UE determines the radio frame that carries PEI using a frame-level PEI offset, and determines the starting point and duration of PEI monitoring based on network configurations. Monitoring duration can be the same as SMTC window (by default) , or a longer value configured by the network.
  • UE 1101 goes to deep sleep during the gap from PEI to PO if the PEI indicates a paging in upcoming PO (s) .
  • UE 1101 monitors PO and decodes the paging message inside, if the PEI indicates no paging in upcoming PO (s) .
  • UE 1101 performs connection establishment with network 1102 if its UE ID is included in the paging message.
  • FIG. 12 is a flow chart of a method of providing sequence-based PEI for power consumption enhancements from UE perspective in a 5G/NR network in accordance with one novel aspect of the present invention.
  • a UE receives paging configuration in a wireless communication network.
  • the UE monitors a PEI based on the paging configuration, wherein the PEI comprises an SSS sequence or a TRS sequence that indicates whether there is a paging for a PO in a corresponding PF.
  • the UE monitors the PO in the corresponding PF when the PEI indicates there is a paging for the PO in the corresponding PF.
  • the UE enters a sleep mode (e.g., the deep sleep mode) from the reception of the PEI to the corresponding PF when the PEI is not detected or indicates there is no paging for the PO in the corresponding PF.
  • a sleep mode e.g., the deep sleep mode
  • FIG. 13 is a flow chart of a method of providing sequence-based PEI for power consumption enhancements from network perspective in a 5G/NR network in accordance with one novel aspect of the present invention.
  • a base station provides paging configuration to a UE in a wireless communication system.
  • the base station sends a PEI to the UE based on the paging configuration, wherein the PEI comprises an SSS sequence or a TRS sequence that indicates whether there is a paging for a PO in a corresponding PF.
  • the base station sends a paging message over the PO in the corresponding PF to the UE when the PEI indicates there is a paging for the PO in the corresponding PF.
  • the base station refrains itself from sending the paging message over the PO in the corresponding PF to the UE when the PEI indicates there is no paging for the PO in the corresponding PF.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé de fourniture d'un indicateur précoce de radiorecherche (PEI) à base d'une séquence permettant d'améliorer une consommation d'énergie dans un réseau 5G/NR. Selon la nouvelle procédure de réception de radiorecherche avec un indicateur PEI, un UE reçoit, d'une station de base, une configuration de radiorecherche dans un système de communication sans fil, et surveille un indicateur PEI selon la configuration de radiorecherche. L'UE peut omettre la surveillance d'une occasion de radiorecherche (PO) si l'indicateur PEI indique qu'il n'y a pas de radiorecherche pour l'occasion de radiorecherche dans la PF correspondante. Le récepteur principal de l'UE est typiquement activé à chaque cycle de radiorecherche pour la réception de LOOP, MEAS et PEI. Toutefois, si l'indicateur PEI indique qu'il n'y a pas de radiorecherche pour l'occasion de radiorecherche, alors l'UE peut désactiver son récepteur principal pour passer dans un mode sommeil (par exemple, sommeil profond) juste après la réception de l'indicateur PEI. Par conséquent, une économie d'énergie peut être obtenue non seulement pour une surveillance d'occasion de radiorecherche, mais également pour un sommeil léger entre le dernier SSB/PEI et l'intervalle de surveillance d'occasion de radiorecherche et des transitions d'état lorsque l'UE n'est pas recherché.
PCT/CN2021/104997 2020-07-08 2021-07-07 Mécanisme de radiorecherche à faible consommation d'énergie avec indicateur précoce de radiorecherche (pei) à base d'une séquence WO2022007844A1 (fr)

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WO2024060230A1 (fr) * 2022-09-23 2024-03-28 Zte Corporation Techniques de communication de signaux de référence associés au positionnement pour des dispositifs sans fil

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