CN117280768A

CN117280768A - User equipment, base station and wireless communication method

Info

Publication number: CN117280768A
Application number: CN202180096704.1A
Authority: CN
Inventors: 沙希德·简; 生嘉
Original assignee: TCL Communication Ningbo Ltd
Current assignee: TCL Communication Ningbo Ltd
Priority date: 2021-05-10
Filing date: 2021-05-10
Publication date: 2023-12-22
Also published as: WO2022236620A1

Abstract

A User Equipment (UE), a base station, and a wireless communication method are provided. A wireless communication method performed by a UE, comprising configuring, by a base station, L1 physical layer signaling, wherein the L1 physical layer signaling informs the UE of availability/unavailability of TRS/CSI-RS occasions before a next Paging Occasion (PO), a payload of the L1 physical layer signaling carries a TRS/CSI-RS availability indication and contains a bit field in the form of a bitmap and/or a code point, and the L1 physical layer signaling comprises L1 physical layer signaling based on a Paging Early Indication (PEI) and/or L1 physical layer signaling based on paging downlink control information (P-DCI). This may solve the problems existing in the prior art, enhance power saving in idle/inactive mode, avoid blind detection complexity for the UE for TRS/CSI-RS decoding, reduce network L1 physical layer indication overhead and/or provide good communication performance.

Description

User equipment, base station and wireless communication method

Technical Field

The present disclosure relates to the field of wireless communication systems, and more particularly, to a User Equipment (UE), a base station, and a wireless communication method that can provide power saving enhancement of a UE by considering Automatic Gain Control (AGC) and time and frequency (T/F) synchronization based on a Tracking Reference Signal (TRS)/channel state information reference signal (CSI-RS) before paging occasion instead of synchronization based on a Synchronization Signal Block (SSB) in a Radio Resource Control (RRC) -idle/inactive mode User Equipment (UE). More particularly, the present disclosure relates to physical layer explicit availability indication of TRS/CSI-RS occasions for idle/inactive UEs and considers multiple parameters of physical layer signaling to minimize overhead impact.

Background

Wireless communication systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These wireless communication systems may be capable of supporting communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems (e.g., long Term Evolution (LTE) systems) and fifth generation (5G) systems (which may be referred to as New Radio (NR) systems). These systems may employ techniques such as Code Division Multiple Access (CDMA), time Division Multiple Access (TDMA), frequency Division Multiple Access (FDMA), orthogonal Frequency Division Multiple Access (OFDMA), or discrete fourier transform-spread OFDM (DFT-S-OFDM). A wireless multiple-access communication system may include multiple base stations or network access nodes, each supporting communication for multiple communication devices, which may be referred to as User Equipment (UEs), simultaneously. The wireless communication network may include base stations capable of supporting communication for the UE. The UE may communicate with the base station via a Downlink (DL) and an Uplink (UL). DL refers to a communication link from a base station to a UE, and UL refers to a communication link from a UE to a base station.

Power saving technology plays a key role in 5G New Radio (NR) systems to support low power devices such as industrial wireless sensors, video surveillance and wearable devices, etc. To save energy and save battery, the UE may use Discontinuous Reception (DRX) in Radio Resource Control (RRC) -idle/inactive mode and take a lot of time. During the RRC idle/inactive mode, the UE is in sleep mode, turns off Radio Frequency (RF), and periodically wakes up to monitor the Physical Downlink Control Channel (PDCCH) for checking for the presence of paging messages. However, decoding paging messages is complex and consumes a significant amount of power resources.

Further, the Tracking Reference Signal (TRS)/channel state information reference signal (CSI-RS) configuration for RRC idle/inactive UEs aims to avoid Automatic Gain Control (AGC) and time and frequency (T/F) synchronization based on a legacy Synchronization Signal Block (SSB) and to enhance power saving gain. In the third generation partnership project radio access network working group (3 GPP RAN WG), it has been agreed to "provide idle/inactive mode UEs with potential TRS/CSI-RS opportunities available in connected mode". Significant advances have been made in the configuration of TRS/CSI-RS for idle/inactive mode UEs. Most companies support informing UEs of TRS/CSI-RS indications before Paging Occasions (POs). Further, carrying an availability/unavailability indication to inform the UE is considered in the physical layer design for power saving enhancement. However, there is no clear suggestion to explain how to design physical layer signaling for the TRS/CSI-RS occasion availability indication, focusing on the indication overhead, the validity time, the application delay and the beam-selective transmission of the availability indication.

Accordingly, there is a need for a User Equipment (UE), a base station, and a wireless communication method that can solve the problems in the prior art, enhance power saving in idle/inactive mode, avoid blind detection complexity for a TRS/CSI-RS decoded UE, reduce network L1 physical layer indication overhead, and/or provide good communication performance.

Disclosure of Invention

An object of the present disclosure is to propose a User Equipment (UE), a base station and a wireless communication method, which can solve the problems existing in the prior art, enhance power saving in idle/inactive mode, avoid blind detection complexity of the UE for TRS/CSI-RS decoding, reduce network L1 physical layer indication overhead, and/or provide good communication performance.

In a first aspect of the present disclosure, a wireless communication method performed by a User Equipment (UE) includes: the method comprises configuring, by a base station, first layer (L1) physical layer signaling, wherein the L1 physical layer signaling informs a UE of availability/unavailability of a Tracking Reference Signal (TRS)/channel state information reference signal (CSI-RS) occasion before a next Paging Occasion (PO), a payload of the L1 physical layer signaling carries a TRS/CSI-RS availability indication and contains bit fields in the form of a bitmap and/or a code point, and the L1 physical layer signaling comprises L1 physical layer signaling based on a Paging Early Indication (PEI) and/or L1 physical layer signaling based on paging downlink control information (P-DCI).

In a second aspect of the present disclosure, a wireless communication method performed by a base station includes: the User Equipment (UE) is configured with first layer (L1) physical layer signaling, wherein the L1 physical layer signaling informs the UE of the availability/unavailability of a Tracking Reference Signal (TRS)/channel state information reference signal (CSI-RS) occasion before a next Paging Occasion (PO), a payload of the L1 physical layer signaling carries a TRS/CSI-RS availability indication and contains bit fields in the form of a bitmap and/or code points, and the L1 physical layer signaling comprises L1 physical layer signaling based on a Paging Early Indication (PEI) and/or L1 physical layer signaling based on paging downlink control information (P-DCI).

In a third aspect of the present disclosure, a User Equipment (UE) includes a memory, a transceiver, and a processor coupled to the memory and the transceiver. The processor is configured with first layer (L1) physical layer signaling by a base station, wherein the L1 physical layer signaling informs a UE of an availability/unavailability of a Tracking Reference Signal (TRS)/channel state information reference signal (CSI-RS) occasion before a next Paging Occasion (PO), a payload of the L1 physical layer signaling carries a TRS/CSI-RS availability indication and contains a bit field in the form of a bitmap and/or a code point, and the L1 physical layer signaling includes L1 physical layer signaling based on a Paging Early Indication (PEI) and/or L1 physical layer signaling based on paging downlink control information (P-DCI).

In a fourth aspect of the disclosure, a base station includes a memory, a transceiver, and a processor coupled to the memory and the transceiver. The processor is configured to configure first layer (L1) physical layer signaling to a User Equipment (UE), wherein the L1 physical layer signaling informs the UE of an availability/unavailability of a Tracking Reference Signal (TRS)/channel state information reference signal (CSI-RS) occasion before a next Paging Occasion (PO), a payload of the L1 physical layer signaling carries a TRS/CSI-RS availability indication and contains bit fields in the form of a bitmap and/or a code point, and the L1 physical layer signaling comprises L1 physical layer signaling based on a Paging Early Indication (PEI) and/or L1 physical layer signaling based on paging downlink control information (P-DCI).

In a fifth aspect of the present disclosure, a non-transitory machine-readable storage medium has stored thereon instructions that, when executed by a computer, cause the computer to perform the above-described method.

In a sixth aspect of the present disclosure, a chip includes a processor configured to invoke and run a computer program stored in a memory to cause a device in which the chip is installed to perform the above-described method.

In a seventh aspect of the present disclosure, a computer-readable storage medium storing a computer program causes a computer to execute the above-described method.

In an eighth aspect of the present disclosure, a computer program product comprises a computer program, and the computer program causes a computer to perform the above method.

In a ninth aspect of the present disclosure, a computer program causes a computer to perform the above method.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or related art, the following drawings, which will be described in the embodiments, are briefly introduced. It is evident that the drawings are only some embodiments of the present disclosure from which one of ordinary skill in the art could obtain other drawings without undue effort.

Fig. 1 is a schematic diagram illustrating Long Term Evolution (LTE) idle User Equipment (UE) synchronization from a serving cell.

Fig. 2 is a schematic diagram illustrating New Radio (NR) idle/inactive mode UE synchronization using a Synchronization Signal Block (SSB) from a serving cell.

Fig. 3 is a diagram illustrating NR idle/inactive mode UE synchronization using a Tracking Reference Signal (TRS)/channel state information reference signal (CSI-RS) from a serving cell.

Fig. 4 is a block diagram of one or more User Equipments (UEs) and a base station (e.g., a gNB) for communication in a communication network system according to an embodiment of the disclosure.

Fig. 5 is a flowchart illustrating a wireless communication method performed by a User Equipment (UE) according to an embodiment of the present disclosure.

Fig. 6 is a flowchart illustrating a wireless communication method performed by a base station according to an embodiment of the present disclosure.

Fig. 7 is a schematic diagram illustrating an example of PEI-based L1 signaling for availability indication of TRS/CSI-RS according to an embodiment of the present disclosure.

Fig. 8 is a schematic diagram illustrating an example of PEI based TRS/CSI-RS availability indication with indication cycling according to an embodiment of the present disclosure.

Fig. 9 is a schematic diagram illustrating an example of P-DCI based L1 signaling for availability indication of TRS/CSI-RS according to an embodiment of the present disclosure.

Fig. 10 is a schematic diagram illustrating an example of a P-DCI based TRS/CSI-RS availability indication with an indication cycle according to an embodiment of the present disclosure.

Fig. 11 is a schematic diagram illustrating an example of an indication of availability of multiple RS resources according to an embodiment of the present disclosure.

Fig. 12 is a schematic diagram illustrating an example of a single timer mechanism for availability validity time measurement according to an embodiment of the present disclosure.

Fig. 13 is a schematic diagram illustrating an example of a dual timer mechanism for availability validity time measurement according to an embodiment of the present disclosure.

Fig. 14 is a schematic diagram illustrating an example of application delay when the availability status is not changed according to an embodiment of the present disclosure.

Fig. 15 is a schematic diagram illustrating an example of application delays in which the unavailable state is not changed according to an embodiment of the present disclosure.

Fig. 16 is a schematic diagram illustrating an example of an application delay in which a TRS state changes from off to on according to an embodiment of the present disclosure.

Fig. 17 is a schematic diagram illustrating an example of application delay in which a TRS state changes from on to off according to an embodiment of the present disclosure.

Fig. 18 is a schematic diagram illustrating an example of beam-specific transmission of an availability indication according to an embodiment of the disclosure.

Fig. 19 is a block diagram of a system for wireless communication according to an embodiment of the present disclosure.

Detailed Description

The embodiments of the present disclosure describe in detail technical matters, structural features, achieved objects and effects with reference to the drawings as follows. In particular, the terminology in the embodiments of the disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure.

Some embodiments of the present disclosure relate to fifth generation (5G) New Radio (NR) wireless communication systems. Some embodiments focus on power saving enhancement of a User Equipment (UE) by taking into account Automatic Gain Control (AGC) and time and frequency (T/F) synchronization based on Tracking Reference Signal (TRS)/channel state information reference signal (CSI-RS) prior to paging occasion instead of synchronization based on Synchronization Signal Blocks (SSB) in Radio Resource Control (RRC) -idle/inactive mode UEs. More particularly, the present disclosure relates to physical layer explicit availability indication of TRS/CSI-RS occasions for idle/inactive UEs and considers multiple parameters of physical layer signaling to minimize overhead impact.

Energy efficiency is one of the key factors in 5G New Radios (NRs) for supporting diverse use cases including enhanced mobile broadband (emmbb), large-scale machine type communication (mctc), and ultra-reliable low latency communication (URLLC). In order to save energy and improve UE battery life, various power saving techniques have been defined and implemented in 5G NR. Discontinuous Reception (DRX) is one of the effective power saving techniques defined in 5G NR, where the UE enters RRC idle/inactive mode, turns off Radio Frequency (RF) and periodically wakes up to monitor the Physical Downlink Control Channel (PDCCH) for checking the presence of paging messages. However, decoding paging messages is complex and consumes a significant amount of power resources. In an example, the UE performs the following steps to monitor for pages: the ue wakes up before the paging occasion. The ue turns on Radio Frequency (RF) and baseband. Agc and T/F synchronization (called loop convergence) and serving cell acknowledgement. The ue attempts to Physical Downlink Control Channel (PDCCH) decoding Downlink Control Information (DCI) scrambled with a paging radio network temporary identifier (P-RNTI). 5. If no paging is found, the UE enters Discontinuous Reception (DRX). 6. If paging DCI (P-DCI) is found depending on the payload, the UE decodes a corresponding Physical Downlink Shared Channel (PDSCH). 7. If the UE identity is included in PDSCH, the UE initiates a Random Access Channel (RACH) procedure, otherwise the UE returns to DRX.

Fig. 1 illustrates Long Term Evolution (LTE) idle User Equipment (UE) synchronization from a serving cell. Fig. 2 illustrates New Radio (NR) idle/inactive mode UE synchronization using a Synchronization Signal Block (SSB) from a serving cell. Fig. 1 and 2 illustrate that in some embodiments, a UE in RRC idle/inactive mode consumes power for various activities such as Automatic Gain Control (AGC) and time/frequency (T/F) channel tracking, radio Resource Measurement (RRM), and paging monitoring. To this end, LTE supports always-on cell-specific reference signals (CRSs) in each subframe, as shown in fig. 1. On the other hand, NR supports Synchronization Signal Blocks (SSBs), and typically requires several SSB bursts transmitted with a longer period (e.g., 20 ms) than LTE CRS, resulting in the UE consuming more power than LTE, as shown in fig. 2. The number of SSB bursts required for Automatic Gain Control (AGC) and T/F channel tracking depends on the signal-to-interference-and-noise ratio (SINR) of the UE's serving channel. As shown in fig. 2, when the UE is at high SINR, the reception of three SSBs is the baseline required by the UE before decoding the paging downlink control information DCI.

Fig. 2 illustrates NR idle/inactive mode UE synchronization using a Tracking Reference Signal (TRS)/channel state information reference signal (CSI-RS) from a serving cell. In NR, a UE in idle/inactive mode needs to wake up earlier, longer and more frequently than an LTE UE for subsequent activities such as AGC and T/F tracking. Therefore, the power consumption of the NR UE in idle/inactive mode is much higher than that of the LTE UE in idle mode. Based on this motivation, the 3GPP RAN WG has agreed to assign potential TRS/CSI-RS opportunities for UEs in idle/inactive mode to replace legacy SSB-based synchronization and enhance power savings prior to PO, as shown in FIG. 3.

Furthermore, the RAN WG approves the work item in the WID for Rel-17 UE power saving enhancement in idle/inactive mode UEs, which includes at least one of the following objectives: means are specified for providing potential TRS/CSI-RS opportunities available in connected mode to idle/inactive mode UEs, minimizing overhead impact. In the 3ggp ran1#104-e conference, "notify the UE of availability of TRS/CSI-RS at configured occasion" is agreed. Since the availability of TRS/CSI-RS depends on the UEs connected in the network, in case there is a TRS/CSI-RS in the network, idle/inactive UEs should be notified early to avoid their blind detection complexity for TRS/CSI-RS decoding. Furthermore, in the 3gpp ran1#104bis-e conference, supporting at least physical layer signaling, e.g. paging DCI and/or PEI, has been discussed and agreed for explicit availability indication of TRS/CSI-RS at configured occasions to idle/inactive UEs, as specified in the following protocol. However, further studies are required on detailed designs of physical layer signaling for TRS/CSI-RS explicit availability indication, such as physical layer signaling indication content, validity time, application delay, and availability indication transmission in a beam-selective manner.

As discussed in the 3gpp RAN 104bis-e conferencing protocol above, idle/inactive UEs are notified of the availability of TRS/CSI-RS based on explicit indications. However, there is a need for further research on explicit availability indication of TRS/CSI-RS at configured occasions to idle/inactive UEs using L1 physical layer signaling and detailed designs thereof, such as physical layer signaling indication content, TRS/CSI-RS validity time, availability/unavailability indication application delay, and availability/unavailability indication transmission in a beam-selective manner. Thus, in some embodiments of the present disclosure, L1 physical layer signaling for early availability indication of TRS/CSI-RS occasions to idle/inactive mode UEs, its effective time, application delay, and beam-selective availability indication transmission are further studied.

The goal of explicit availability indication of TRS/CSI is to avoid UE blind detection complexity and increase its power saving gain. Physical layer signaling (paging DCI and PEI) may be used to indicate the availability/unavailability of TRS/CSI-RS occasions before the PO to idle/inactive mode UEs. However, the physical layer signaling-based availability/unavailability indication for each TRS/CSI-RS resource to the UE may increase the indication overhead. Furthermore, considering only the physical layer indication without discussing some important parameters such as indication content, validity time, application delay and beam selection transmission, some misunderstandings may occur between the network/gNB and the UE, which will be given below. 1. When transmitting the availability indication, the UE may assume that the TRS/CSI-RS occasion is available for time inaccuracy. The ue may assume that the availability indication becomes valid once received. 3. Whether and how to indicate availability in selective beam mode to cover all UEs.

To reduce the indication overhead based on physical layer signaling, measure the exact time of TRS/CSI-RS availability, avoid mismatch between the gNB and UEs with respect to TRS state change and all UEs covered under the coverage area of the SSB, the present disclosure interprets the physical layer signaling indication content by introducing an indication loop and considers important parameters such as single and dual timer effective time mechanisms for transmission of an availability/unavailability indication to all UEs under the coverage area of the SSB, application delay and beam selection transmission and transmission of availability/unavailability indication to all UEs under the coverage area of the SSB.

In the prior art, some proposals have been made regarding TRS/CSI availability indication mechanisms and configuration of TRS/CSI in SIB signaling. As discussed by many contributions in the 3gpp ran1104bis-e conference, physical layer signaling such as paging DCI and Paging Early Indication (PEI) may be used to indicate to the UE the availability of TRS/CSI RS before PO. Two main mechanisms for indicating availability for TRS/CSI-RS occasions are explained below. 1. Legacy paging DCI: availability information regarding TRS/CSI-RS availability is transmitted to the UE early on in paging DCI to avoid blind detection complexity of the UE for decoding the TRS/CSI-RS. 2. Paging early indication: PE1 is used to inform the UE of the availability of TRS/CSI-RS to avoid blind detection complexity of the UE for decoding TRS/CSI-RS.

In some embodiments, the main object of the present invention is to avoid blind detection complexity of TRS/CSI-RS decoding at the UE side by designing physical layer signaling for early indication of TRS/CSI-RS availability. The proposed solution to achieve our objective is summarized as follows. 1. Two types of L1 physical layer signaling (P-DCI and PEI) are considered to inform the UE about the availability/unavailability of TRS/CSI-RS occasions before the PO and carry the indication content in the form of a bitmap and/or code points. 2. An indication cycle/period is introduced in which the indication of the TRS/CSI-RS occasion is carried by the P-DCI and/or PEI of one paging occasion for the next X paging occasions in order to reduce network indication overhead. 3. A Shan Dingshi and dual timer mechanism is introduced to measure the exact effective time of TRS/CSI-RS occasion availability. 4. The application delay of the availability/unavailability indication has been considered and analyzed with reference to different situations. Beam selective mode transmission for trs/CSI-RS availability all UEs that have been considered to be covered in the coverage area of different SSB beams.

In some embodiments, the present disclosure designs L1 physical layer signaling for carrying a previous indication of TRS/CSI-RS availability/unavailability, and has the following advantages: 1. power saving in idle/inactive mode is enhanced by using TRS/CSI-RS for AGC and T/F tracking instead of using legacy SSB based synchronization. 2. The previous indication of TRS/CSI-RS availability of a UE or group of UEs is taken into account to avoid blind detection complexity of the UE for TRS/CSI-RS decoding. 3. The network L1 physical layer indication overhead is significantly reduced. 4. The TRS/CSI-RS availability duration is accurately measured. 5. The application of the availability/unavailability indication delays to avoid mismatch of TRS state changes (OFF to ON or ON to OFF) between the network and the UE. 6. The transmission of the availability indication in a beam-selective manner informs all UEs under the coverage areas of the different SSBs.

Fig. 4 illustrates that in some embodiments one or more User Equipments (UEs) 10 and base stations (e.g., gnbs) 20 for communication in a communication network system 30 are provided in accordance with embodiments of the disclosure. The communication network system 30 includes one or more UEs 10 and a base station 20. One or more UEs 10 may include a memory 12, a transceiver 13, and a processor 11 coupled to the memory 12 and the transceiver 13. The base station 20 may include a memory 22, a transceiver 23, and a processor 21 coupled to the memory 22 and the transceiver 23. The processor 11 or 21 may be configured to implement the proposed functions, processes and/or methods described in the present specification. The layers of the radio interface protocol may be implemented in the processor 11 or 21. The memory 12 or 22 is operatively coupled to the processor 11 or 21 and stores various information to operate the processor 11 or 21. The transceiver 13 or 23 is operatively coupled to the processor 11 or 21 and the transceiver 13 or 23 transmits and/or receives radio signals.

The processor 11 or 21 may include an Application Specific Integrated Circuit (ASIC), other chipset, logic circuit, and/or data processing device. Memory 12 or 22 may include Read Only Memory (ROM), random Access Memory (RAM), flash memory, memory cards, storage media, and/or other storage devices. The transceiver 13 or 23 may include baseband circuitry to process radio frequency signals. When the embodiments are implemented in software, the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The modules may be stored in the memory 12 or 22 and executed by the processor 11 or 21. The memory 12 or 22 may be implemented within the processor 11 or 21 or external to the processor 11 or 21, in which case the memory 12 or 22 can be communicatively coupled to the processor 11 or 21 via various means as is known in the art.

In some embodiments, the processor 11 is configured with first layer (L1) physical layer signaling by the base station 20, wherein the L1 physical layer signaling informs the UE of the availability/unavailability of a Tracking Reference Signal (TRS)/channel state information reference signal (CSI-RS) occasion before the next Paging Occasion (PO), the payload of the L1 physical layer signaling carries a TRS/CSI-RS availability indication and contains bit fields in the form of a bitmap and/or code points, and the L1 physical layer signaling comprises L1 physical layer signaling based on a Paging Early Indication (PEI) and/or L1 physical layer signaling based on paging downlink control information (P-DCI). This may solve the problems existing in the prior art, enhance power saving in idle/inactive mode, avoid blind detection complexity for UEs for TRS/CSI-RS decoding, reduce network L1 physical layer indication overhead, and/or provide good communication performance.

In some embodiments, the processor 21 is configured to configure first layer (L1) physical layer signaling to the User Equipment (UE) 10, wherein the L1 physical layer signaling informs the UE of the availability/unavailability of a Tracking Reference Signal (TRS)/channel state information reference signal (CSI-RS) occasion before a next Paging Occasion (PO), a payload of the L1 physical layer signaling carries a TRS/CSI-RS availability indication and contains bit fields in the form of a bitmap and/or a code point, and the L1 physical layer signaling comprises L1 physical layer signaling based on a Paging Early Indication (PEI) and/or L1 physical layer signaling based on paging downlink control information (P-DCI). This may solve the problems existing in the prior art, enhance power saving in idle/inactive mode, avoid blind detection complexity for UEs for TRS/CSI-RS decoding, reduce network L1 physical layer indication overhead, and/or provide good communication performance.

Fig. 5 illustrates a wireless communication method 200 performed by a User Equipment (UE) in accordance with an embodiment of the present disclosure. In some embodiments, the method 200 includes: block 202, configuring, by a base station, first layer (L1) physical layer signaling, wherein the L1 physical layer signaling informs a UE of availability/unavailability of a Tracking Reference Signal (TRS)/channel state information reference signal (CSI-RS) occasion before a next Paging Occasion (PO), a payload of the L1 physical layer signaling carries a TRS/CSI-RS availability indication and contains a bit field in the form of a bitmap and/or a code point, and the L1 physical layer signaling includes L1 physical layer signaling based on a Paging Early Indication (PEI) and/or L1 physical layer signaling based on paging downlink control information (P-DCI). This may solve the problems existing in the prior art, enhance power saving in idle/inactive mode, avoid blind detection complexity for UEs for TRS/CSI-RS decoding, reduce network L1 physical layer indication overhead, and/or provide good communication performance.

Fig. 6 illustrates a wireless communication method 300 performed by a base station in accordance with an embodiment of the present disclosure. In some embodiments, the method 300 includes: block 302, configuring first layer (L1) physical layer signaling to a User Equipment (UE), wherein the L1 physical layer signaling informs the UE of an availability/unavailability of a Tracking Reference Signal (TRS)/channel state information reference signal (CSI-RS) occasion before a next Paging Occasion (PO), a payload of the L1 physical layer signaling carries a TRS/CSI-RS availability indication and contains bit fields in the form of a bitmap and/or code points, and the L1 physical layer signaling includes L1 physical layer signaling based on a Paging Early Indication (PEI) and/or L1 physical layer signaling based on paging downlink control information (P-DCI). This may solve the problems existing in the prior art, enhance power saving in idle/inactive mode, avoid blind detection complexity for UEs for TRS/CSI-RS decoding, reduce network L1 physical layer indication overhead, and/or provide good communication performance.

In some embodiments, the present disclosure provides TRS/CSI-RS based AGC and T/F synchronization to replace SSB based T/F synchronization in RRC idle/inactive mode UEs prior to paging occasions to enhance UE power saving. In the 3gpp ran1#104bis-e conference, it has been agreed to support at least L1 based signaling, e.g. paging DCI and/or PEI, for explicit availability indication of TRS/CSI-RS at configured occasions to idle/inactive UEs. Some embodiments of the present disclosure also discuss L1 physical layer signaling for explicit availability indication of TRS/CSI-RS occasions, which may be used to notify the UE prior to the PO. Some embodiments of the present disclosure discuss the design of L1 physical layer signaling for the indication purpose of TRS/CSI-RS occasions, which indicates the content, and propose in detail how to reduce L1 signaling overhead. Some embodiments of the present disclosure interpret important parameters of physical layer signaling and propose to consider these parameters in the design of physical layer signaling, such as effective time, application delay, and beam selection transmission.

L1-based signaling method:

this example explains the physical layer signaling that can be used to carry an availability/unavailability indication of TRS/CSI-RS occasions to inform the UE of TRS/CSI-RS availability in the network prior to the PO. The payload of the physical layer signaling contains a bit field in the form of a bitmap or code point, which carries the TRS/CSI-RS availability indication. Two L1 signaling considerations for indicating overhead reduction by the present disclosure are explained below.

PEI-based physical layer signaling:

fig. 7 illustrates an example of PEI-based L1 signaling for availability indication of TRS/CSI-RS according to an embodiment of the present disclosure. In the PEI-based physical layer signaling method, PEI carries an availability indication of the TRS/CSI-RS for the next PO, as shown in FIG. 7. The PEI may carry an indication of the availability/unavailability of the TRS/CSI-RS in the form of a bitmap or code point. Wherein each bit from the bitmap or code point is associated with at least one TRS/CSI-RS resource or TRS/CSI-RS resource set/group. In this disclosure, consider that a value of 1 for a bitmap or code point indicates availability of a TRS/CSI-RS resource or a set/group of TRS/CSI-RS resources, and a value of 0 for a bitmap or code point indicates unavailability of a TRS/CSI-RS resource. For example, consider 6 configured TRS/CSI-RS resources of a connected mode UE shared to an idle/inactive mode UE, where TRS1, TRS2, TRS4, TRS5 are available to the idle/inactive mode UE, and TRS3 and TR6 are not available to the idle/inactive UE because TRS3 and TRS6 are turned off by the network after a period of time. The payload of PEI may use b=6 bits in the form of a bitmap or code point to associate a one-to-one mapping of each bit to the TRS/CSI-RS resources, as shown in table 1. It should be noted that the transmission of TRS/CSI-RS resources configured for connected mode UEs is shared to idle/inactive mode UEs.

Table 1: one-to-one bitmap based indication for TRS/CSI-RS availability

PEI overhead reduction:

fig. 8 illustrates an example of PEI based TRS/CSI-RS availability indication with indication cycling according to an embodiment of the present disclosure. To reduce PEI overhead, an indication loop with X paging occasions and T indication loops is introduced, where x= {1,2,3,4 … … } paging occasions and t= {1T,2T,4T } indication loops. In some embodiments, in an exemplary method, the gNB may transmit PEI in the form of a bitmap or code point at the beginning of the indication cycle to indicate TRS/CSI-RS availability for X paging occasions, as shown in fig. 8. The indication cycle is flexible and it depends on the availability duration of the TRS/CSI-RS resources in the network. If the duration of availability of TRS/CSI-RS resources in the network is longer, a longer indication cycle, e.g., 4T, may be configured. In an exemplary method, the gNB can avoid the transmission of additional PEI for the TRS/CSI-RS availability indication and flexibly select the value of T. An illustrative example of this approach is shown in fig. 8, where the gNB transmits PEI at the beginning of an indication cycle of the indication cycle with period t=2t to indicate TRS/CSI-RS availability for x+1 and x+2 paging occasions.

Physical signaling based on P-DCI:

fig. 9 illustrates an example of P-DCI based L1 signaling for availability indication of TRS/CSI-RS according to an embodiment of the present disclosure. In an exemplary signaling method, P-DCI may be used to indicate a TRS/CSI-RS occasion for the next PO, as shown in fig. 9. The P-DCI based physical layer signaling for TRS/CSI-RS occasion availability indication uses reserved bits of the existing P-DCI without introducing any additional physical layer signaling, thus reducing network physical layer signaling overhead. Because the P-DCI has 6 reserved bits and it may be used to carry the indicated content of TRS/CSI-RS availability in the form of a bitmap and/or code points, where each bit from the bitmap or code point is associated with at least one TRS/CSI-RS resource or TRS/CSI-RS resource set/group. In some embodiments of the present disclosure, it is contemplated that a value of 1 for the bitmap or code point indicates availability of the TRS/CSI-RS resource or the TRS/CSI-RS resource set/set, and a value of 0 for the bitmap or code point indicates unavailability of the TRS/CSI-RS resource. For example, consider 4 TRS/CSI-RS resources configured for a connected mode UE, which may be shared to idle/inactive mode UEs. To indicate these TRS/CSI-RS resources to idle/inactive mode UEs, a P-DCI basic physical layer signal may be transmitted in the PO to carry the availability content of the TRS/CSI-RS resources for the next PO. The payload of the P-DCI may carry b=4 bits of 6 reserved bits from the P-DCI in the form of a bitmap or code point to associate a one-to-one mapping of each bit to the TRS/CSI-RS resource.

P-DCI overhead reduction:

fig. 10 illustrates an example of a P-DCI based TRS/CSI-RS availability indication with an indication loop according to an embodiment of the present disclosure. In order to reduce the P-DCI indication overhead, the same method as explained in the above embodiments may be used, wherein an indication loop with X paging occasions and t= {1T,2T,4T } indication loops is introduced. In this exemplary method, the gNB may transmit an availability/unavailability indication in the form of a bitmap or code point at the beginning P-DCI of the indication cycle to indicate TRS/CSI-RS availability for the X paging occasion, as shown in fig. 10. The indication cycle is flexible and it depends on the available duration of the TRS/CSI-RS resources in the network. If the duration of the TRS/CSI-RS resources available in the network is longer, a longer indication cycle, e.g., 4T, may be configured. In this exemplary method, the gNB may avoid transmission of additional bitmaps or code points in the P-DCI of the next PO for TRS/CSI-RS availability indication and flexibly select the value of T. Fig. 10 illustrates an illustrative example of this method, in which the gNB transmits a bitmap or code point at the beginning P-DCI of an indication cycle of the indication cycle with period t=2t to indicate TRS/CSI-RS availability for x+1 and x+2 paging occasions.

The configuration has an availability indication indicating a cycle:

as discussed and illustrated in some embodiments of fig. 9 and 10, to reduce overhead of additional PEI and P-DCI due to availability indication, the gNB may configure an indication cycle that may be as long as a 4T indication cycle. SIB signaling may be used to perform availability indication loop configuration since the UE is in idle/inactive mode. Further, the gNB can flexibly select the value of the T indication cycle, and system information update is not required even when the TRS resource is changed frequently. The IEs proposed below may be included in the downlink configcommonsib to provide availability indication loop configuration to idle/inactive mode UEs.

Table 2: availability indication loop configuration field description

Multiple TRS/CSI-RS resource indications:

fig. 11 illustrates an example of an indication of availability of multiple RS resources in accordance with an embodiment of the present disclosure. Similarly, in the RANs 1#104-e conference, it has been agreed that multiple RS resources can be configured for TRS/CSI-RS occasions to idle/inactive mode UEs. When the gNB configures multiple RS resources, it may indicate multiple sets/groups of RS resources to the UE or group of UEs for the next paging cycle through the P-DCI and/or PEI of the paging cycle. The UE or group of UEs in the next paging cycle in a particular PO will select TRS resources for AGC and T/F synchronization near that particular PO. An illustrative example of this method is shown in fig. 8. The P-DCI or PEI based physical layer signaling for N paging cycles may indicate the set or group of TRS/CSI-RS resources in the next n+1 paging cycle. In the same manner, P-DCI or PEI based physical layer signaling of the n+1 paging cycle may indicate the set/group of TRS/CSI-RS resources for the n+2 paging cycle. The PEI or P-DCI may use only 1 bit to indicate multiple TRS/CSI-RS resources and thus significantly reduce physical layer signaling overhead. A UE in an n+1 or n+2 paging cycle located within a particular PO will select a TRS for T/F tracking near that PO, as shown in fig. 11. For example, UEs located in the n+1 paging cycle in PO1, PO2, and PO3 will use TRS1, TRS2, and TRS3 for T/F tracking.

The physical layer indicates signaling parameters:

effective time:

when the idle/inactive UE receives the availability indication, the UE assumes that the indicated TRS/CSI-RS occasion is available for the active time and not available at the expiration of the active time. In the 3gpp ran1#104bis-e conference, some contributions propose that the UE may assume a valid time before the next PO, or that it may be explicitly indicated to the UE, e.g. configured by SIB or included in the availability indication. However, explicit indication of the validity time may increase indication and/or configuration overhead. To address this issue and provide the UE with accurate effective time of TRS/CSI-RS occasions, the present disclosure proposes a single timer-based and dual timer-based effective time measurement mechanism.

Fig. 12 illustrates an example of a single timer mechanism for active time measurement according to an embodiment of the present disclosure. In some embodiments, the gNB transmits an availability indication to the UE in a Shan Dingshi mechanism of active time. When the UE successfully receives the availability indication, the gNB may start a valid timer. Upon expiration of the timer, the gNB sends an indication to the UE, so the UE knows the effective time for TRS/CSI-RS availability, as shown in FIG. 12. The advantage of the single timer mechanism for availability of TRS/CSI-RS occasions is that only one timer is used on the gNB side, but the disadvantage of this mechanism is that the gNB again transmits a timer stop indication to the UE upon expiration of the validity time.

Fig. 13 illustrates an example of a dual timer mechanism for active time measurement according to an embodiment of the present disclosure. In some embodiments, in a dual timer mechanism, the gNB transmits an availability indication to the UE. When the UE successfully receives the availability indication, the UE sends an ACK to the gNB to acknowledge receipt of the availability indication. The active timer starts at the UE side when an ACK is transmitted. When on the gNB side, the active timer starts upon receipt of an ACK, as shown in FIG. 13. When both timers expire, both the UE and the gNB know the validity time of the TRS/CSI-RS availability. The advantage of the dual timer mechanism is that it may avoid transmitting a timer stop indication to the UE.

Availability indicates an application delay:

the application delay is the duration when the UE receives the availability indication until it becomes active. When the network/gNB indicates availability/unavailability to the UE, an application delay is necessary in some cases to determine when the availability/unavailability indication may be valid or begin operation. In this embodiment, two cases are proposed and the application delay in both cases is analyzed. In both cases, the network/gNB already knows the availability/unavailability status of the TRS, e.g., whether the TRS availability/unavailability status changes over time or remains the same. In both cases, the UE assumes that the TRS is not present and performs SSB-based AGC and T/F tracking until an availability/unavailability indication is received.

Fig. 14 illustrates an example of application delay when the availability status is not changed according to an embodiment of the present disclosure. Fig. 15 illustrates an example of application delay without a change in the unavailable state according to an embodiment of the present disclosure. Case 1 presents two conditions when the availability/unavailability status of the TRS is not changed, for example when availability/unavailability is indicated to the UE in the PO and the network/gNB experiences that it is not necessary to switch the TRS on or off, as shown in fig. 14 and 15. In fig. 14, the network/gNB transmits an availability indication in the PO for the next PO, and the status of the TRS remains the same, e.g., when the network/gNB is transmitting an availability indication, the TRS is available before and after the PO. In this condition, no delay needs to be applied and the availability indication becomes valid once received by the UE. Similarly, in fig. 15, the network/gNB transmits an unavailability indication in the PO for the next PO, and the state of the TRS remains the same, e.g., when the network/gNB is transmitting an availability indication, the TRS is unavailable before and after the PO. In this condition, too, no delay needs to be applied and the unavailability indication becomes valid once received by the UE. In both conditions, the UE assumes that the TRS is not present and performs SSB-based synchronization until an availability/unavailability indication is received.

Fig. 16 illustrates an example of an application delay in which a TRS state changes from off to on according to an embodiment of the present disclosure. Fig. 17 illustrates an example of an application delay in which a TRS state changes from on to off according to an embodiment of the present disclosure. Case 2 explains two conditions when there is a change in availability/unavailability status of the TRS, for example, when availability/unavailability is indicated to the UE in the PO and the network/gNB experiences turning on or off of the TRS, as shown in fig. 16 and 17.

Fig. 16 illustrates that in some embodiments, the network/gNB has knowledge of the availability status of the TRSs and transmits an availability indication in the POs for the next POs based on the status of the TRSs. However, during PO1 when the network/gNB is transmitting an availability indication, the TRS is actually unavailable during this period, and after the indication is transmitted, there are connected UEs in the network and the TRS is available. Under this condition, a delay needs to be applied, which is the duration from PO1 when the UE receives the availability indication until the TRS state is turned off. The availability indication becomes valid when the unavailability state of the TRS changes to an availability state, e.g., the TRS switches from off to on.

Fig. 17 illustrates that in some embodiments, the TRS is available for a particular period of time. The TRS cannot be turned off immediately because the network/gNB considers that different UEs monitor the P-DCI/PEI at different occasions. The network/gNB may stop TRS transmissions after all UEs may receive the indication. Thus, the TRS is still available in the network, but the network/gNB already knows that the TRS will switch from on to off, and transmits an unavailability indication for the next PO in the PO according to the unavailability status of the TRS. Under this condition, too, a delay needs to be applied, which is the duration from PO1 when the UE receives the unavailability indication until the TRS state is on. The unavailability indication becomes valid when the availability state of the TRS changes to an unavailability state, e.g., the TRS switches from on to off.

Indication of availability of beam selection mode:

fig. 18 illustrates an example of beam-specific transmission of an availability indication according to an embodiment of the disclosure. In this embodiment, the comprehensive design of the TRS availability indication in a beam-selective manner is discussed. Since idle/inactive UEs exist under the coverage areas of different beams, and the gNB needs to know the active beam of the UE in order to transmit the TRS availability indication in a beam selective manner. Since the UE is in idle/inactive mode and cannot report its active beam or beam quality measurement signals to the network using CSI-RS. Thus, the network/gNB needs to calculate the beams that can be used to cover the UE. One possible solution is to allow a UE in idle/inactive mode to send a paging request to the gcb on which the UE resides in each paging cycle. Thus, the gNB determines an associated active beam covering a particular UE and uses the associated active beam to transmit the availability indication. However, this method will consume a lot of energy on the UE side and is not a suitable method for beam selection mode indication transmission. A more practical solution proposed by the present disclosure is to transmit an indication of the availability of TRS resources over a specific beam associated with the transmission of the same TRS resource. For this purpose, the gNB needs to associate the TRS resource beam with the SSB beam. Since the idle/inactive UEs are located below the coverage areas of different SSB beams, a TRS needs to be configured for each SSB beam. Thus, the presence of a TRS occasion may be beam specific according to the SSB beam, and an indication of the availability of the TRS occasion may also be transmitted in the specific beam associated with the TRS transmission. An illustrative example of transmitting TRS availability indications in a beam-selective manner is shown in fig. 18, wherein, for example, 3 TRS resources are configured in such a way that each TRS resource beam is associated with an SSB beam. For more detail, TRS1 is associated with SSB1 and SSB1 is using beam 1, TRS2 is associated with SSB2 and SSB2 is using beam 2, and TRS3 is associated with SSB3 and SSB3 is using beam 3. This one-to-one association of TRSs and SSBs further directs the network to transmit TRS availability indications in a beam-selective manner, e.g., beam 1, beam 2, and beam 3 may be used to transmit availability indications for TRS1, TR2, and TR3, respectively.

The commercial benefits of some embodiments are as follows. 1. Solves the problems in the prior art. 2. Enhancing power saving in idle/inactive mode. 3. The blind detection complexity of the UE for TRS/CSI-RS decoding is avoided. 4. The network L1 physical layer indication overhead is reduced. 5. Providing good communication performance. 6. Providing high reliability. 7. Some embodiments of the present disclosure are used by: 5G-NR chipset suppliers, V2X communication system development suppliers, automotive manufacturers (including cars, trains, trucks, buses, bicycles, motorcycles, helmets, etc.), unmanned aerial vehicles (unmanned aerial vehicles), smart phone manufacturers, communication devices for public safety use, AR/VR device manufacturers (e.g., games), conference/seminars, educational objectives. Some embodiments of the present disclosure are a combination of "technologies/procedures" that may be employed in the 3GPP specifications to create the end product. Some embodiments of the present disclosure propose a technical mechanism.

Fig. 16 is a block diagram of an example system 700 for wireless communication according to an embodiment of the disclosure. The embodiments described herein may be implemented into a system using any suitably configured hardware and/or software. Fig. 16 illustrates a system 700 comprising Radio Frequency (RF) circuitry 710, baseband circuitry 720, application circuitry 730, memory/storage 740, display 750, camera 760, sensor 770, and input/output (I/O) interface 780, coupled to one another at least as shown. Application circuitry 730 may include circuitry such as, but not limited to, one or more single-core or multi-core processors. The processor may comprise any combination of general-purpose processors and special-purpose processors, such as graphics processors, application processors. The processor may be coupled with the memory/storage and configured to execute instructions stored in the memory/storage to enable various applications and/or operating systems running on the system.

While the present disclosure has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the present disclosure is not limited to the disclosed embodiment, but is intended to cover various arrangements made without departing from the scope of the appended claims in its broadest interpretation.

Claims

1. A wireless communication method performed by a user equipment, UE, comprising:

the method comprises configuring, by a base station, first layer L1 physical layer signaling, wherein the L1 physical layer signaling informs the UE of availability/unavailability of tracking reference signal TRS/channel state information reference signal CSI-RS occasions before a next paging occasion PO, a payload of the L1 physical layer signaling carries a TRS/CSI-RS availability indication and contains bit fields in the form of a bitmap and/or code points, and the L1 physical layer signaling comprises L1 physical layer signaling based on paging early indication PEI and/or L1 physical layer signaling based on paging downlink control information P-DCI.

2. The wireless communication method of claim 1, wherein in the PEI-based L1 physical layer signaling and/or the P-DCI-based L1 physical layer signaling, each bit from the bitmap and/or the code point is associated with at least one TRS/CSI-RS resource or TRS/CSI-RS resource set/group; and/or a bit value of "1" of the bitmap and/or the code point indicates availability of the TRS/CSI-RS resource or the TRS/CSI-RS resource set/group, and a bit value of "0" of the bitmap and/or the code point indicates unavailability of the TRS/CSI-RS resource.

3. The wireless communication method of claim 2, wherein an indication cycle/period is introduced, wherein the PEI-based L1 physical layer signaling and/or the P-DCI-based L1 physical layer signaling for one paging occasion carries an indication of TRS/CSI-RS occasions for the next X paging occasions, where X is an integer and greater than or equal to 1.

4. The wireless communication method of claim 3, further comprising configuring, by the base station, a parameter DownlinkConfigCommonSIB, wherein the parameter provides an availability indication loop configuration to the UE when the UE is an idle/inactive mode UE.

5. The wireless communication method of claim 2, further comprising configuring, by the base station, RS resources, wherein the RS resources indicate to the UE or group of UEs for a next paging cycle an RS resource set/group through the PEI-based L1 physical layer signaling and/or the P-DCI-based L1 physical layer signaling of a paging cycle and/or the UE or group of UEs in a next paging cycle in a particular PO selects one TRS resource for automatic gain control AGC and time and frequency T/F synchronization close to the particular PO.

6. The wireless communication method of claim 2, wherein when the UE receives the TRS/CSI-RS availability indication from the base station, the base station starts a validity timer for availability of the TRS/CSI-RS occasion, and upon expiration of the validity timer, the UE receives an indication from the base station such that the UE knows a validity time for availability of the TRS/CSI-RS occasion.

7. The wireless communication method of claim 2, wherein when the UE receives the TRS/CSI-RS availability indication from the base station, the UE sends an acknowledgement ACK to the base station to acknowledge receipt of the TRS/CSI-RS availability indication, and an active timer of availability of the TRS/CSI-RS occasion is started at the UE at transmission of the ACK and/or the active timer is started at the base station at receipt of the ACK.

8. The wireless communication method of claim 2, wherein when there is no change in availability/unavailability status of a TRS, the UE assumes that the TRS is not present and the UE performs synchronization based on a synchronization signal block SSB until the TRS/CSI-RS availability indication is received.

9. The wireless communication method of claim 8, wherein when the UE receives the TRS/CSI-RS availability indication for the next PO from the base station in a PO and the status of the TRS remains the same, no application delay of the TRS/CSI-RS availability indication is required and the TRS/CSI-RS availability indication becomes valid once received by the UE.

10. The wireless communication method of claim 8, wherein when the UE receives the TRS/CSI-RS availability indication for the next PO from the base station in a PO and the status of the TRS remains the same, no application delay of the TRS/CSI-RS availability indication is required and a TRS/CSI-RS unavailability indication becomes valid once received by the UE.

11. The wireless communication method of claim 2, wherein an application delay of the TRS/CSI-RS availability indication is required when there is a change in availability/unavailability status of the TRS.

12. The wireless communication method of claim 11, wherein the application delay of the TRS/CSI-RS availability indication begins with a first PO when the UE receives the TRS/CSI-RS availability indication until the TRS state is off; and/or the TRS/CSI-RS availability indication becomes valid when the unavailability status of the TRS changes to an availability status.

13. The wireless communication method of claim 11, wherein the application delay of the TRS/CSI-RS unavailability indication begins at a first PO when the UE receives the TRS/CSI-RS unavailability indication until the TRS state is on; and/or the TRS/CSI-RS availability indication becomes valid when the availability status of the TRS changes to an unavailable status.

14. The wireless communication method of claim 2, further comprising configuring, by the base station, an indication of availability of the same TRS resource over a particular beam associated with transmission of the TRS resource.

15. The wireless communication method of claim 14, wherein the existence of a TRS occasion can be in accordance with an SSB beam but the particular beam, and the availability of the TRS occasion indicates that transmissions can be in the particular beam associated with the TRS transmissions; and/or transmitting the UE covered under the coverage areas of different SSB beams in a beam selection mode indicated by the TRS/CSI-RS availability.

16. A wireless communication method performed by a base station, comprising:

the method comprises the steps of configuring first layer L1 physical layer signaling to User Equipment (UE), wherein the L1 physical layer signaling informs the UE of availability/unavailability of Tracking Reference Signal (TRS)/channel state information (CSI-RS) opportunities before a next Paging Opportunity (PO), a payload of the L1 physical layer signaling carries TRS/CSI-RS availability indication and contains bit fields in the form of bitmaps and/or code points, and the L1 physical layer signaling comprises L1 physical layer signaling based on Paging Early Indication (PEI) and/or L1 physical layer signaling based on paging downlink control information (P-DCI).

17. The wireless communication method of claim 16, wherein in the PEI-based L1 physical layer signaling and/or the P-DCI-based L1 physical layer signaling, each bit from the bitmap and/or the code point is associated with at least one TRS/CSI-RS resource or TRS/CSI-RS resource set/group; and/or a bit value of "1" of the bitmap and/or the code point indicates availability of the TRS/CSI-RS resource or the TRS/CSI-RS resource set/group, and a bit value of "0" of the bitmap and/or the code point indicates unavailability of the TRS/CSI-RS resource.

18. The wireless communication method of claim 17, wherein an indication cycle/period is introduced, wherein the PEI-based L1 physical layer signaling and/or the P-DCI-based L1 physical layer signaling for one paging occasion carries an indication of TRS/CSI-RS occasions for the next X paging occasions, where X is an integer and greater than or equal to 1.

19. The wireless communication method of claim 18, further comprising: a parameter downlink configcommonsib is configured to the UE, wherein the parameter provides an availability indication loop configuration to the UE when the UE is an idle/inactive mode UE.

20. The wireless communication method of claim 17, further comprising: configuring RS resources to the UE, wherein the RS resources indicate an RS resource set/group to the UE or group of UEs for a next paging cycle through the PEI-based L1 physical layer signaling and/or the P-DCI-based L1 physical layer signaling of a paging cycle, and/or the UE or group of UEs located in a next paging cycle in a particular PO selects one TRS resource for automatic gain control AGC and time and frequency T/F synchronization close to the particular PO.

21. The wireless communication method of claim 17, wherein the base station starts a validity timer for availability of the TRS/CSI-RS occasion when the base station transmits the TRS/CSI-RS availability indication to the UE, and upon expiration of the validity timer, the base station transmits an indication to the UE so that the UE knows a validity time for availability of the TRS/CSI-RS occasion.

22. The wireless communication method of claim 17, wherein when the base station transmits the TRS/CSI-RS availability indication to the UE, the base station receives an acknowledgement ACK from the UE to acknowledge receipt of the TRS/CSI-RS availability indication, and an active timer of availability of the TRS/CSI-RS occasion is started at the UE at transmission of the ACK and/or the active timer is started at the base station at receipt of the ACK.

23. The wireless communication method of claim 17, wherein when there is no change in the availability/unavailability status of a TRS, the base station controls the UE to assume that the TRS is not present, and the base station controls the UE to perform synchronization based on a synchronization signal block SSB until the TRS/CSI-RS availability indication is received.

24. The wireless communication method of claim 23, wherein when the base station transmits the TRS/CSI-RS availability indication for the next PO to the UE in a PO and the state of the TRS remains the same, no application delay of the TRS/CSI-RS availability indication is required and the TRS/CSI-RS availability indication becomes valid once received by the UE.

25. The wireless communication method of claim 23, wherein when the base station transmits the TRS/CSI-RS availability indication for the next PO to the UE in a PO and the status of the TRS remains the same, no application delay of the TRS/CSI-RS availability indication is required and the TRS/CSI-RS unavailability indication becomes valid once the UE receives.

26. The wireless communication method of claim 17, wherein an application delay of the TRS/CSI-RS availability indication is required when there is a change in availability/unavailability status of a TRS.

27. The wireless communications method of claim 26, wherein the application delay of the TRS/CSI-RS availability indication begins with a first PO when the UE receives the TRS/CSI-RS availability indication until the TRS state is off; and/or the TRS/CSI-RS availability indication becomes valid when the unavailability status of the TRS changes to an availability status.

28. The wireless communications method of claim 26, wherein the application delay of the TRS/CSI-RS availability indication begins with a first PO when the UE receives the TRS/CSI-RS unavailability indication until the TRS state is on; and/or the TRS/CSI-RS availability indication becomes valid when the availability status of the TRS changes to an unavailable status.

29. The wireless communication method of claim 17, further comprising configuring the UE with an indication of availability of the same TRS resource over a particular beam associated with transmission of the TRS resource.

30. The wireless communication method of claim 29, wherein a presence of a TRS occasion can be in accordance with an SSB beam but the particular beam, and an availability of the TRS occasion indicates that transmissions can be in the particular beam associated with the TRS transmissions; and/or transmitting the UE covered under the coverage areas of different SSB beams in a beam selection mode indicated by the TRS/CSI-RS availability.

31. A user equipment, UE, comprising:

a memory;

a transceiver; and

a processor coupled to the memory and the transceiver;

wherein the processor is configured to perform the method according to any one of claims 1 to 15.

32. A base station, comprising:

a memory;

a transceiver; and

a processor coupled to the memory and the transceiver;

wherein the processor is configured to perform the method of any one of claims 16 to 30.

33. A non-transitory machine-readable storage medium having instructions stored thereon, which when executed by a computer, cause the computer to perform the method of any of claims 1 to 30.

34. A chip, comprising:

a processor configured to invoke and run a computer program stored in a memory to cause a device in which the chip is installed to perform the method according to any of claims 1 to 30.

35. A computer readable storage medium, in which a computer program is stored, wherein the computer program causes a computer to perform the method according to any one of claims 1 to 30.

36. A computer program product comprising a computer program, wherein the computer program causes a computer to perform the method according to any one of claims 1 to 30.

37. A computer program, wherein the computer program causes a computer to perform the method according to any one of claims 1 to 30.