Resource allocation scheme for sidelink communication

Abstract

A method of wireless communication is provided. The method comprises: receiving, by a first device, a first sidelink transmission based on received beam information; selecting a resource set for the second sidelink transmission based on the selection information; and transmitting the second sidelink transmission to the second device based on the transmit beam information.

Description

Technical Field

[0001] This document relates to systems, devices, and techniques for wireless communications. Background Art

[0002] Wireless communication technology is driving the world towards an increasingly connected and networked society. The rapid development of wireless communications and technological advances have created greater demands for capacity and connectivity. Other aspects such as energy consumption, equipment cost, spectrum efficiency and latency are also important to meet the needs of various communication scenarios. Compared with existing wireless networks, the next generation of systems and wireless communication technologies will need to support more users and devices and support an increasingly mobile society. Summary of the invention

[0003] Various methods and apparatus are provided for providing a resource allocation scheme for sidelink communications.

[0004] In one example aspect, a method of wireless communication is disclosed. The method includes: receiving, by a first device, a first side link transmission based on receive beam information; selecting a resource set for a second side link transmission based on selection information; and sending the second side link transmission to a second device based on transmit beam information.

[0005] In yet another example aspect, a wireless communication apparatus including a processor is disclosed. The processor is configured to implement the method described herein.

[0006] In another example aspect, the various techniques described herein may be implemented as processor-executable code and stored on a computer-readable program medium.

[0007] The details of one or more implementations are set forth in the accompanying drawings and the description below. Other features will be apparent from the description and drawings, and from the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 An example diagram representing resource allocation for Mode 1 in FR2 according to some embodiments of the disclosed technology is shown.

[0009] Figure 2 An example diagram showing transmission operations and sensing operations based on transmission beams according to some embodiments of the disclosed technology is shown.

[0010] Figure 3 An example diagram showing a sensing operation based on a receiving beam group and a transmitting operation based on a transmitting beam according to some embodiments of the disclosed technology is shown.

[0011] Figure 4An example diagram showing a transmission operation and a sensing operation based on a transmission beam group according to some embodiments of the disclosed technology is shown.

[0012] Figure 5 An example diagram showing a sensing operation based on a receiving beam group and a transmitting operation based on a transmitting beam group according to some embodiments of the disclosed technology is shown.

[0013] Figure 6 An example diagram showing resource selection based on conflict levels of time and frequency resources according to some embodiments of the disclosed technology is shown.

[0014] Figure 7 Another example diagram showing resource selection based on conflict levels of time and frequency resources according to some embodiments of the disclosed technology is shown.

[0015] Figure 8 An example of the spatial relationship of Beam 1 and Beam 2 according to some embodiments of the disclosed technology is shown.

[0016] Fig. 9 Examples of narrow beams and wide beams based on some embodiments of the disclosed technology are shown.

[0017] Fig.10 An example wireless communication network based on some embodiments of the disclosed technology is shown.

[0018] Fig.11 is a block diagram of an example of a wireless communication device based on some embodiments of the disclosed technology.

[0019] Fig.12 is an example flow chart of a wireless communication method based on some embodiments of the disclosed technology. DETAILED DESCRIPTION

[0020] The disclosed technology provides implementations and examples of resource allocation schemes for sidelink transmission.

[0021] The technology related to sidelink transmission is developing rapidly. Based on the latest discussion progress, FR2 (Frequency Range 2) is a hot topic for sidelink transmission, and how to improve the transmission and reception of SL (sidelink)-PRS (positioning reference signal) and other signals / channels for sidelink positioning in FR2 is under study. For the resource allocation of SL-PRS in FR2, beam management needs to be considered. In addition, the impact of beam information on the resource allocation method (e.g., mode 1 and / or mode 2) also needs to be considered.

[0022] The traditional resource allocation method is based on the time-frequency resources in the resource pool without considering the actual beam effect. Therefore, the traditional method ignores the impact of space on time-frequency resources. For example, in the resource allocation for mode 2 side link transmission, the transmitting UE (user equipment) cannot determine the spatial beam information of the time-frequency domain resources sent by another UE. According to the traditional method, the information received by the transmitting UE is limited regarding the beam information. In fact, according to the traditional method, no beam-related information is provided to the transmitting UE, and the transmitting UE selects resource allocation independently of the beam information.

[0023] Various embodiments of the disclosed technology provide resource allocation techniques for sidelink transmission. Some embodiments of the disclosed technology relate to how to perform resource allocation in FR2 for sidelink transmission and how to perform sensing processes in FR2 for sidelink transmission. These embodiments solve the current problems for sidelink transmission in FR2 (e.g., SL-PRS in SL positioning).

[0024] PRS for NR positions has been approved, for example, RAN#94 for Rel-18 positioning. Sidelink for SI (research project) has been approved, for example, RAN#94 for Rel-18 positioning, as shown below:

[0025] Study and evaluate the performance and feasibility of potential solutions for SL positioning, considering relative positioning, ranging and absolute positioning: [RAN1, RAN2]

[0026] o assessing the bandwidth requirements needed to meet identification accuracy requirements [RAN1],

[0027] o Research includes SL positioning measurements and other RAT (radio access technology)

[0028] Positioning methods (e.g., TDOA) that combine related positioning measurements (e.g., Uu-based measurements)

[0029] (Time Difference Of Arrival, arrival time difference), RTT (Round-Trip Time, round-trip time), AOA / D (Angle of Arrival / Departure, arrival / departure angle), etc.) [RAN1], o Study the sidelink reference signals for positioning purposes from the physical layer perspective, including signal design, resource allocation, measurement, association process, etc., and reuse the existing reference signals and processes from sidelink communication and positioning as much as possible [RAN1],

[0030] o Study the positioning architecture and signalling procedures (e.g. configuration, measurement reporting, etc.) to enable sidelink positioning covering both UE-based positioning and network-based positioning [RAN2, including coordination and alignment with RAN3 and SA2 as required].

[0031] In this patent document, the high layer corresponds to at least one of the following items: RRC (Radio Resource Control) layer, SL LPP (LTE positioning protocol), PC5-RRC, PC5-S (PC5 signaling), MAC (medium access control) layer or application layer, and the physical layer corresponds to the first SCI (Sidelink Control Information), the second SCI, the SCI for SL-PRS or the MAC CE (medium access control control element).

[0032] In some embodiments, the beam, beam information or beam direction have the same or similar concepts, which include at least one of the following items: QCL (quasi co-location) status, TCI (transmission configuration indication) status, spatial relationship information, reference signal information, spatial filter information and precoding information.

[0033] In various embodiments, a beam / beam direction may be a resource. For example, a transmitter spatial filter, a receiver spatial filter, a transmitter precoding, a receiver precoding, an antenna port, an antenna weight vector, or an antenna weight matrix may be used as a beam.

[0034] The parameters of the QCL include at least one of the following: Doppler shift, Doppler spread, average delay, delay spread, average gain, spatial parameters (spatial Rx parameters), or spatial relationship information.

[0035] The beam may support various transmission or reception methods, including at least one of the following: spatial division multiplexing or frequency / time domain diversity. The transmission beam or transmission method may be indicated by a reference signal resource index or a spatial relationship index.

[0036] The beam of the transmission or the transmission or reception method of the transmission is determined based on the reference signal resource index. Therefore, the transmission or reception filter parameters of the transmission are the same as the transmission or reception filter parameters of the reference signal resource indicated by the reference signal resource index.

[0037] The spatial relationship can be indicated by a reference signal. Therefore, the spatial relationship index can also be a reference signal index. The transmit beam or the transmit or receive method is determined based on the reference signal resource index, which means that the transmitted demodulation reference signal and the reference signal indicated by the reference signal resource index have the same QCL parameters.

[0038] The spatial parameters include spatial reception parameters such as angle of arrival, spatial correlation of the reception beam, average delay and correlation of time-frequency channel response (including phase information).

[0039] The spatial relationship for a certain CH / RS (e.g., SL-PRS in a dedicated resource pool) may depend on the resource pool ID, slot ID, CSI-RS ID, PSSCH / SL-PRS resource and pool ID, or other combinations of these IDs or (one or more) resources.

[0040] The channel / reference signal (CH / RS) includes at least one of the following items: PSFCH (physical sidelink feedback channel), PSSCH (physical sidelink shared channel), PSCCH (physical sidelink control channel), S-SSB (sidelink synchronization signal block), physical downlink shared channel (Physical Downlink Shared Channel, PDSCH), physical downlink control channel (Physical Downlink Control Channel, PDCCH), PRS, SL-PRS, Channel State Information Reference Signal (CSI-RS), Channel State Information Interference Measurement Signal (CSI-IM), Demodulation Reference Signal (DMRS), Downlink Demodulation Reference Signal (DL-DMRS), PSCCH DMRS, PSSCH DMRS, Sidelink CSI-RS, Uplink Demodulation Reference Signal (UL DMRS), Sounding Reference Signal (Sounding Reference Signal, DMRS). Signal, SRS), Phase Tracking Reference Signal (Phase-Tracking Reference Signal, PTRS), Random Access Channel (Random Access Channel, RACH), Synchronization Signal (Synchronization Signal, SS), Synchronization Signal Block (Synchronization Signal Block, SSB or S-SSB), Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS, SL-PSS or SL-SSS) or PSBCH (Physical Sidelink Broadcast Channel, physical side link broadcast channel) DMRS.

[0041] A beam may be sent from an LMF (Location Management Function) to a BS, and / or from a BS to a UE, and / or from a UE to a BS, and / or from a BS to a BS, and / or from a UE to a LMF, and / or from a UE to a UE. Furthermore, the beam information may be included in a higher layer (at least one of an RRC layer, a SL LPP, a PC5-RRC, a PC5-S, a MAC layer, or an application layer) or a physical layer (a first SCI, a second SCI, an SCI for a SL-PRS, or a MAC CE).

[0042] In the following description, the section titles are used in this document only to improve readability and do not limit the scope of the embodiments and techniques disclosed in each section to only that section. In addition, for ease of understanding, some embodiments are described with reference to the Third Generation Partnership Project (3GPP) New Radio (NR) standard ("5G"), and the described techniques can be implemented in different wireless systems that implement protocols other than the 5G protocol.

[0043] Resource allocation mode 1 in FR2

[0044] Generally, two sidelink resource allocation modes are supported, namely, Mode 1 and Mode 2. In Mode 1, the sidelink resources in time-domain and frequency-domain allocation are provided by the network (eg, base station). Figure 1 An example diagram representing a resource allocation method for mode 1 in FR2 based on some embodiments of the disclosed technology is shown. In this embodiment, a base station (BS) has beam information of a transmitting UE and a receiving UE, and beam information of (one or more) other UEs covered by the BS. In addition, the BS determines resource allocation in the time-frequency domain for these UEs. In this example, resource allocation for receiving beams and transmitting beams and time-frequency domain resources can be flexibly adjusted, and unnecessary waste of resources can be avoided.

[0045] Case 1: For mode 1 SL-PRS transmission in FR2, based on the resource allocation mode of mode 1, the base station provides the transmitting UE (transmitting UE, TxUE) with the transmitting beam information (Tx beam information) and provides the receiving UE (receiving UE, RxUE) with the receiving beam information (Rx beam information). In this example, DCI 3-0 can be used to provide the beam information.

[0046] Case 2: For mode 1 SL-PRS transmission in FR2, the base station provides transmit beam information (Tx beam information) to the transmitting UE (TxUE), and the transmitting UE (TxUE) provides receive beam information (Rx beam information) to the receiving UE (RxUE). In this example, the next beam direction may be indicated in the SCI (Sidelink Control Information). When a message or channel (e.g., SL-PRS, PSSCH) is sent from the transmitting UE to the receiving UE, the transmitting UE will send the SCI, and the receiving UE receives the SCI. The receiving UE can identify the resource region of the message or channel based on the SCI.

[0047] Case 3: For Mode 1 SL-PRS transmission in FR2, the base station provides the transmit beam information (Tx beam information) to the transmitter UE (TxUE). The following two cases can be implemented:

[0048] - Case 3-1: RxUE performs beam scanning to obtain reception beam information. In this example, SCI may be used to prompt the RxUE to perform beam scanning.

[0049] - Case 3-2: The RxUE can receive beams in all directions using an omnidirectional antenna.

[0050] A beam may be sent from the LMF to the base station, and / or from the base station to the UE, and / or from the UE to the base station, and / or from the base station to another base station, and / or from the UE to the LMF, and / or from the UE to another UE. The beam information may be included in a higher layer (at least one of the RRC layer, SL LPP, PC5-RRC, PC5-S, MAC layer, or application layer) or a physical layer (a first SCI, a second SCI, an SCI for SL-PRS, or a MAC CE).

[0051] In some embodiments, the UE may forward, send and / or receive beam information based on UE capabilities. For example, the UE may only send beam information to a base station and / or to a LMF and / or to another UE or a combination thereof. An indicator may be used to indicate these UE capabilities.

[0052] Resource allocation mode 2 in FR2

[0053] In Mode 2, the UE determines the sidelink transmission resource(s) in the time-frequency domain in a resource pool.

[0054] Beam information

[0055] In this embodiment, the high layer of the UE triggers the UE to perform a sensing process. In order to perform the sensing process, the high layer may provide beam information at the triggering time slot n. Here, the high layer is a high layer applied to the UE performing the sensing process. The UE performs a sensing process based on the beam information and selects a resource subset for sidelink transmission. After the sensing process, the UE reports the resource subset to the high layer, which selects resources for sidelink transmission from the resource subset. Sidelink transmission may correspond to the transmission of a reference signal (RS), a channel (CH), data, etc. In FR2, the UE sends a sidelink transmission based on one or more beams. Therefore, unlike the sensing under the traditional resource allocation scheme, the sensing process under the resource allocation mode 2 in FR2 needs to consider the impact of the beam on resource allocation. The one or more beams have corresponding directions, and the direction of the beam may be referred to as beam information. The beam information may be obtained in various ways. In some embodiments, at the triggering time slot n, the high layer provides beam information for resource allocation. In some embodiments, the beam information may come from a TxUE or a coordinating UE (including an RxUE).

[0056] For mode 2 resource allocation of FR2, when taking SL-PRS resource allocation as an example, beam information can be provided from a high layer. Beam information includes Tx beam information (Tx beaminfo) and Rx beam information (Rx beaminfo). In some embodiments, Tx beam information refers to beam information used by UE for its transmission operation. Therefore, for each of the transmitting UE (TxUE) and the receiving UE (RxUE), Tx beam information can be used for its transmission operation. In some embodiments, Rx beam information refers to beam information used by UE for its reception operation. Therefore, for the transmitting UE (TxUE), Rx beam information refers to beam information used by the transmitting UE (TxUE) for its reception operation. For the receiving UE (RxUE), Rx beam information refers to beam information used by the receiving UE (RxUE) for its reception operation. In these examples, the transmission and / or reception performed by the transmitting UE may refer to operations for sending and / or receiving signals, information, channels, etc. In this document, signals, information, channels, etc. may be referred to as data.

[0057] In resource allocation mode 2, the upper layer can request the UE to determine a resource subset from which the upper layer will select resources for SL-PRS transmission. To trigger this process, in time slot n, the upper layer provides the following parameters for the PSSCH / PSCCH transmission:

[0058] - the resource pool whose resources are to be reported;

[0059] -Frequency domain index of SL-PRS;

[0060] -optionally, (Tx and / or Rx) beam information;

[0061] -L1 priority, prio TX ;

[0062] - the remaining SL-PRS delay budget;

[0063] - the number of comb offsets to be used for SL-PRS transmission in a slot;

[0064] -Resource reservation interval P rsvp_TX , in milliseconds (msec);

[0065] -Panel ID (identification).

[0066] Although the above table shows that Tx beam information and Rx beam information are provided from a high level, other embodiments may be used to provide Tx beam information and Rx beam information in various ways other than the high level. In some embodiments, other items included in the above table may also be provided in various ways without being limited by the high level. Depending on the source of providing the Tx beam information and / or Rx beam information, the following may occur.

[0067] Case 1: Tx beam information and / or Rx beam information is transmitted by TxUE / perceiving UE through the physical layer.

[0068] Case 2: Tx beam information and / or Rx beam information is transmitted by another UE (RxUE or coordinating UE) through a higher layer.

[0069] Case 3: Tx beam information and / or Rx beam information is transmitted from another UE (RxUE or coordinating UE) through a lower layer.

[0070] In some embodiments of the disclosed technology, the TxUE receives various messages / information / channels according to some configured beam information. The TxUE performs resource selection for the message / information / channel to be sent based on the configured beam information and selection information. The TxUE sends (one or more) messages and / or information and / or channels to the RxUE based on the beam.

[0071] In some embodiments, the TxUE is (pre-)configured with a beam direction for sending (one or more) messages / information / channels to another UE. Then, based on the beam information and selection information obtained from the high-level configuration or physical layer, the TxUE performs resource selection according to the various messages / information / channels received in the perception window.

[0072] In some embodiments, the TxUE receives various messages / information / channels according to some configured beam information. In addition, according to the configured beam, the sub-weight refinement will be received in the perception window. The TxUE receives various messages / information / channels according to the specific configured beam information.

[0073] Sidelink transmission includes transmission of signals and / or data or channels (such as PSCCH, PSSCH, PSFCH, SL-PRS, SCI for indicating SL-PRS, DMRS, CSI-RS).

[0074] Resource selection based on beam information

[0075] For resource allocation mode 2 of FR2, one or more sensing beams have (one or more) relationships with (one or more) Tx beams. There is a certain association relationship between one or more sensing beams and resource allocation.

[0076] The transmitting UE (TxUE) receives messages based on sensing beams with different directions in the sensing window at the physical layer. Set A (a subset of resources for sidelink transmission) is obtained based on a selection process and set A is provided to its upper layer. The selection process is based on resources excluded by reservation of the resources obtained in the sensing window. Depending on which directional beams the UE uses to obtain set A, the following situations may occur.

[0077] Case 1: All directions are used to obtain set A.

[0078] Case 2: Partial directions are used to obtain set A.

[0079] In some embodiments, the partial direction has some relationship with the transmit beam (Tx beam). For example, the partial direction corresponds to (one or more) transmit beam (Tx beam) directions or (one or more) beam directions opposite to the Rx beam group (RBG), or others. In some embodiments, the partial direction corresponds to a direction perpendicular to the propagation direction.

[0080] For case 1, the transmitting UE (TxUE) performs a sensing process based on all directional beams or wide beams. The UE performs a resource selection process based on the sensing result. The transmitting UE (TxUE) can detect conflicts in the sensing window and obtain set A. For case 2, the sensing-related beam information can also be referred to as a receiving beam. The receiving beam for case 1 means all received beams. The receiving beam for case 2 means a partially received beam.

[0081] For FR2, there are some resource transmissions with specific directions that do not conflict. The following Examples 1 to 4 discuss the sensing process without considering time / frequency resources, while the following Examples 5 and 6 discuss the sensing process based on time / frequency resources. The sensing processes in Examples 1 to 4 involve more conflicts between the beam directions, while the sensing processes in Examples 5 and 6 involve fewer conflicts between the beam directions. In the following examples, the sensing performed by the transmitting UE (TxUE) is mainly discussed without the sensing of other UEs.

[0082] Example 1 - Sensing process and transmission of SL-PRS1 based on Tx beam

[0083] In this example, the sensing beam takes one direction and the transmit beam takes another direction. Therefore, the sensing beam and the transmit beam have a 1:1 relationship. In this example, the transmitting UE (TxUE) operates based on the Tx beam information and is (pre-)configured with the direction of the Tx beam to the RxUE. The transmitting UE (TxUE) performs the sensing process using the sensing beam. The sensing beam can have the same direction as or opposite to the Tx beam direction or a direction with another relationship to the Tx beam direction. For example, Figure 2 As shown, the transmitting UE (UEA) wants to send SL-PRS2 to another UE (UEB) using the beam 2 direction from UEA to UEB. Before sending SL-PRS2, the transmitting UE (UEA) performs a sensing process using the beam 1 direction. Based on the sensing process using the beam 1 direction, the transmitting UE (UEA) can determine whether there is a conflict in the time-frequency domain resources with the UEB using the beam direction (beam 2 direction) from UEA.

[0084] The transmitting UE (UEA) selects resources for SL-PRS2 with the direction of beam 2 in the transmission window based on the received resources with the direction of beam 1. Figure 2 As shown, the transmitting UE (UEA) receives SL-PRS1 in the direction of beam 1 in the perception window, and the reserved resources of SL-PRS1 are obtained in the selection window. Then, UEA avoids the conflict of the reserved resources of SL-PRS1 with the resource selection of SL-PRS2 in the selection window.

[0085] Example 2 - Rx beam group based sensing process and Tx beam based SL-PRS1 transmission

[0086] In this example, the sensing beam adopts multiple directions, while the transmitting beam adopts one direction. Therefore, the sensing beam and the transmitting beam have an N:1 relationship. In this example, the transmitting UE (TxUE) operates based on the Tx beam information and is (pre-) configured with the direction of the Tx beam to the RxUE (beam 2 direction). The transmitting UE (TxUE) then uses the beam direction that is the same and / or opposite to the beam direction, and / or one or more adjacent beam directions of the same and / or opposite beam direction to perform a sensing process and / or a selection process. Therefore, in this example and other examples, (one or more) sensing beams may have one or more directions, including the direction that is the same or opposite to the configured beam direction, the direction of an adjacent beam that is the same or opposite to the configured beam direction, and the like.

[0087] One or more adjacent Rx beams may be referred to as an RBG (Rx beam group), which contains N Rx beams and has a similar spatial relationship with each other. The perception process may be based on the Rx beam group. Since the RBG includes multiple beams, it can be considered that the perception process is based on a wide beam. Different and / or the same wide beams may be included in the RBG. The beams in the RBG may overlap spatially.

[0088] RBG can be sent from LMF to base station, and / or RBG can be sent from base station to UE, and / or RBG can be sent from UE to base station, and / or RBG can be sent from base station to another base station, and / or RBG can be sent from UE to LMF, and / or RBG can be sent from UE to UE. RBG can be defined or (pre-) configured in a high layer (at least one of RRC layer, SLLPP, PC5-RRC, PC5-S, MAC layer or application layer) or a physical layer (first SCI, second SCI, SCI for SL-PRS or MAC CE).

[0089] For example, refer to Figure 3 In the example shown in , the transmitting UE (UEA) transmits SL-PRS2 to the receiving UE (UEB) using beam 2, and the receiving UE (UEB) is not at the center of beam 2. Figure 3 In the example, beam X+1, beam X, and beam X-1 are RBGs used for sensing. Beam X is used to send SL-PRS1. When the transmitting UE (UEA) uses RBGs for sensing, the conflict from the direction of beam x+1 can be ignored. When sensing occurs only based on beam x, the conflict from the direction of beam x=1 will be more serious than the conflict from beam x.

[0090] The transmitting UE (UEA) selects resources for SL-PRS2 with the direction of beam 2 in the transmission window based on the reserved resources in the direction of beam x+1. The direction of beam x+1 is adjacent to the opposite direction of beam 2. The transmitting UE (UEA) receives the signal using beam x+1 in the perception window and obtains the reserved resources in the selection window. When selecting resources in the selection window, the transmitting UE (UEA) makes a selection to avoid conflicts between these reserved resources for the resource selection of SL-PRS2.

[0091] Example 3 - Sensing process and transmission of SL-PRS1 based on Tx beam group

[0092] In this example, the sensing beam adopts one direction, while the transmission beam adopts multiple directions. Therefore, the sensing beam and the transmission beam have a 1:M relationship. In this example, the transmitting UE (TxUE) operates based on the Tx beam information and is (pre-) configured with the direction of the Tx beam toward the RxUE. Then, the transmitting UE (TxUE) obtains a sensing beam direction that is the same, opposite, or has another relationship with respect to the Tx beam direction. The transmitting UE (TxUE) can also obtain one or more adjacent beam directions of the Tx beam. Before sending SL-PRS1, the transmitting UE (TxUE) performs a sensing process and a selection process based on the sensing beam. One or more adjacent Tx beams can be named as a TBG (Tx Beam Group) containing N Tx beams. And the beams in the TBG have similar spatial relationships. Based on the sensing process, the transmitting UE (TxUE) uses (one or more) beams in the Tx beam group to send SL-PRS to one or more RxUEs. Different and / or the same wide beams may be contained in a TBG. The beams in a TBG may overlap spatially.

[0093] The TBG may be sent from the LMF to the base station, and / or from the base station to the UE, and / or from the UE to the base station, and / or from the base station to another base station, and / or from the UE to the LMF, and / or from the UE to the UE. The TBG may be defined or (pre) configured in a high layer (at least one of the RRC layer, SL LPP, PC5-RRC, PC5-S, MAC layer, or application layer) or a physical layer (a first SCI, a second SCI, an SCI for SL-PRS or MAC CE).

[0094] For example, Figure 4As shown, the transmitting UE (UEB) transmits SL-PRS1 to the receiving UE (UEC) using a Tx beam group including beam x+1, beam x, and beam x-1. The receiving UE (UEC) is not at the center of the beam of SL-PRS1 or the receiving UE (UEC) moves quickly. If the transmitting UE (UEB) transmits SL-PRS1 using only the beam direction corresponding to SL-PRS1, the reception at the receiving UE (UEC) may be poor due to the movement of the receiving UE (UEC). When the transmitting UE (UEB) selects resources for SL-PRS2 with a Tx beam group direction, UEC can receive SL-PRS based on the best receiving beam direction among the Tx beam group directions.

[0095] For example, the TxUE transmits SL-PRS using one or more beams in the Tx beam group. The TxUE can perform resource allocation based on opposite and / or the same beam directions. For example, the TxUE transmits SL-PRS1 to UEB using beam 1. Resource allocation is based on the opposite and / or the same beam as beam 1. The transmitting UE can send information to multiple UEs. In addition to transmitting to UEB, the transmitting UE can also send information to UEC in different beams or at different times. In this example, the TxUE uses different transmit beams to transmit to UEB and UEC respectively, and the two transmit beams are in the same group. At this time, the resource selection of the two transmit beams can use the same perception beam. In this example, when the TxUE wants to send SL-PRS2 to UEC using one or more beams included in the Tx beam group, resource allocation can also be performed based on the opposite and / or the same beam relative to the direction of beam 1. When the TxUE performs resource allocation, the high layer provides the Tx beam direction and / or TBG. The actual beam used to send the sidelink transmission to another UE is one or more of the beams in the TBG.

[0096] Example 4 - Rx beam group based sensing process and Tx beam group based SL-PRS1 transmission

[0097] In this example, the sensing beam adopts multiple directions, and the transmitting beam adopts multiple directions. Therefore, the sensing beam and the transmitting beam have an N:M relationship. In this example, the transmitting UE (TxUE) operates based on the Tx beam information and is (pre-) configured with the direction of the Tx beam toward the RxUE. The transmitting UE (TxUE) then obtains a sensing beam direction that is the same, opposite, or has another relationship with respect to the Tx beam direction. The transmitting UE (TxUE) can also obtain one or more adjacent beam directions of the sensing beam. The transmitting UE (TxUE) then performs a sensing process and a selection process based on one or more of these beams.

[0098] One or more adjacent Rx beams may be referred to as an RBG (Rx beam group) containing N Rx beams. The beams in the RBG have similar spatial relationships. The perception process may be based on one or more beams in the Rx beam group. Since the RBG includes multiple beams, the perception process may be considered to be based on wide beams. The RBG may also be viewed as one or more wide beams corresponding to one or more combinations of some beams. One or more adjacent Tx beams may be referred to as a TBG (Tx beam group) containing N Tx beams. The beams in the TBG have similar spatial relationships to each other. Based on the perception process, the transmitting UE (TxUE) sends SL-PRS to one or more RxUEs using (one or more) beams in the Tx beam group.

[0099] For example, Figure 5 As shown, the transmitting UE (UEA) uses the Tx beam group to send the SL-PRS (SL-PRSy) to the receiving UE (UEB), and uses the Rx beam group for the sensing process. As described above, by using TBG and RBG, conflicts can be avoided and the reception efficiency at the UEC can be improved.

[0100] In some embodiments of the disclosed technology, the TxUE sends SL-PRS using one or more beams in the Tx beam group. The TxUE can perform resource allocation based on one or more beams in the RBG. The TxUE (UEA) sends SL-PRS1 to UEB using beam 1 (a beam in the TBG). Resource allocation is based on one or more beams in the RBG. When the TxUE sends SL-PRS2 to UEC using one or more beams included in the Tx beam group, resource allocation can also be performed based on one or more beams in the RBG. When the TxUE performs resource allocation, the upper layer provides Tx beam information and / or Tx beam direction and / or TBG. The Tx beam information from the upper layer includes at least one beam in the Tx associated beam (one or more beams in one or more TBGs). The actual beam used to send a side link transmission to another UE is one or more beams in each beam in the TBG. In this example, the perception performed based on the RBG is also associated with the TBG. RBG-based resource allocation can be used for one or more beam transmissions in the TBG.

[0101] In some embodiments of the disclosed technology, Tx beam information and / or Rx beam information and / or selection information is obtained from a physical layer, and the physical layer is at least one of a first SCI, a second SCI, an SCI for SL-PRS, or a MAC CE. In this example, the TxUE sends SL-PRS1 to the RxUE using beam 1 in time slot n-3, and the TxUE sends SL-PRS2 to the RxUE at time slot n+3. Before sending SL-PRS2, the TxUE receives an SCI or another notification message, which notifies the beam information and / or the change of beam information. In some examples, the TxUE sends SL-PRS2 using a new beam based on the SCI or another notification message. In some examples, the new beam may be different from beam 1.

[0102] In some embodiments of the disclosed technology, the TxUE transmits SL-PRS according to the indication in the SCI. The SCI contains notification messages, such as beam information of transmission resources (such as (one or more) beam directions). The transmission beam may refer to the beam used for the current transmission, the next transmission, or any other transmission.

[0103] For example, according to what is indicated in the SCI, the TxUE sends the SL-PRS. A bit in the SCI indicates whether the beam direction has changed for the next transmission. When the bit is 1, it indicates that the beam direction has changed. When the bit is 0, it indicates that the beam has not changed and the next transmission will be performed based on the same beam direction as this transmission. In this patent document, the beam direction may be referred to as a beam or beam information.

[0104] In this example, a 1-bit indicator in the SCI sent by UE A is used to indicate the beam direction. In this case, UE B periodically sends SL-PRS to UE A. When UE B receives a 1-bit indicator of 1, UE B may then perform one of the following procedures:

[0105] Case 1: The resource selection mechanism is triggered.

[0106] For example, the UE B will retransmit and modify the sensed beam direction and the transmitted beam direction according to the neighboring beam directions of the original beam direction.

[0107] Case 2: UE B continues to use the time-frequency domain resource location, but the beam direction follows the beam direction fed back from UE A, such as a neighboring beam direction of the original beam direction.

[0108] Case 3: UEB will not make any modification and will make resource selection only after the number of reserved transmissions in this period ends with count 0.

[0109] For example, the UE sends the SL-PRS according to the indication of the SCI. One bit in the SCI indicates the beam scanning for another UE. For example, the UE always sends the SL-PRS to another UE using beam 1, and at time slot n, the UE uses this bit to notify the change of the transmit beam. The RxUE can then perform beam scanning and find a new beam to receive the SL-PRS sent from the TxUE.

[0110] In some embodiments, after performing the sensing process, the TxUE selects a resource set to be used for sidelink transmission to the RxUE. In some embodiments, the resource set is selected by selecting a beam that is independent of the transmit beam obtained from the transmit beam information. In some embodiments, the selected beam has an orthogonal or approximately orthogonal spatial relationship with respect to the Tx beam. In some embodiments, the resource set is selected without considering conflicts in the time-frequency domain. In some embodiments, the resource set is selected by selecting a beam related to the transmit beam. In some embodiments, the selected beam has the same, opposite, approximately the same, or approximately opposite spatial relationship as the transmit beam. In some embodiments, the resource set is selected by considering conflicts in the time-frequency domain.

[0111] Example 5

[0112] In this example, if Figure 6 and Figure 8 As shown, for the TxUE (UEA), beam 1 and beam 2 correspond to the beams in (part of) the received beam information. When the beam information refers to a beam, beam 1 and beam 2 may correspond to (part of) the received beam information. In this example, beam 2 has a direction opposite to beam 1, and beam 2 is used to send a side link transmission (SL-PRS) to UEB. In the perception window, the TxUE receives some SCI / PSSCH / SL-PRS using beam 1 and / or beam 2. The reserved resources in the selection window of beam 1 and / or beam 2 are obtained. In this example, the resources in the selection window are sufficiently idle, and there are idle resources available, which are not reserved by the resources received in the perception window. In this example, the TxUE can select resources with less conflict to send SL-PRS using beam 2. Therefore, the TxUE sends SL-PRS using beam 2 in the selected resource area. In Figure 6 In the figure, the dotted block indicates reservation for future transmission, and the block indicated as "SL-PRS using beam 2" corresponds to resources for sending SL-PRS using beam 2.

[0113] Example 6

[0114] In this example, if Figure 7 and Figure 8As shown, for TxUE (UEA), beam 1 and beam 2 correspond to the beams in (part of) the received beam information. When the beam information refers to a beam, beam 1 and beam 2 may correspond to (part of) the received beam information. In this example, beam 2 has a direction opposite to beam 1, and beam 2 is used to send side link transmission (SL-PRS) to UE B. In the perception window, the TxUE receives some SCI / PSSCH / SL-PRS using beam 1 and / or beam 2. The reserved resources in the selection window of beam 1 and / or beam 2 are obtained.

[0115] exist Figure 7 In this example, Figure 6 Compared to the case shown in Figure 2, there are more resource transmissions and reservations. In this example, for the TxUE, based on beam 1 and beam 2, there may not be enough resources for set A to report. In this case, consider Figure 8 As shown in the spatial relationship, for TxUE (UEA) and RxUE (UEB), the time-frequency resources transmitted through beam 1 have less conflict with the resources transmitted through beam 2. Therefore, in this case, Figure 7 As shown, the TxUE can transmit SL-PRS based on beam 2 using the resource region reserved by beam 1 transmission. Figure 7 In the figure, the dotted blocks indicate reservations for future transmissions, and the blocks indicated as "SL-PRS using beam 2" correspond to resources for sending SL-PRS using beam 2. For example, when receiving resources at slot n-3 in the perception window for period "T" in the SCI, the resources at slot n-3+T are reserved resources. For the RxUE, the resources may have conflicts in the time-frequency domain, but there are fewer conflicts in the spatial domain. Therefore, resources can be selected based only on the spatial domain without considering time and frequency conflicts. CR / CBR can be used to measure whether there are enough resources for the set A to be reported.

[0116] Implementation methods related to CR / CBR

[0117] For the traditional definition of Sidelink Channel Busy Ratio (SL CBR) and Sidelink Channel Occupancy Ratio (SL CR), beam information is not considered. For FR2SL, there are two methods for defining CR / CBR. For the first method, all beam directions are used to measure CR / CBR. For the second method, only some relevant beam directions are used to measure CR / CBR. Therefore, there is more than one CR / CBR for a resource pool, which is different from the traditional scheme.

[0118] In some implementations, channel occupancy ratio (CR) and channel busy ratio (CBR) are received from a higher layer. In some implementations, CR and CBR are measured by a UE. When CR and CBR are measured by a UE, the measurement process requires some parameters from a higher layer.

[0119] The following changes to the CR / CBR definition are suggested:

[0120] SL channel busy rate (SL CBR)

[0121] The SL channel busy rate (SL CBR) measured in time slot n is defined as the fraction of subchannels in the resource pool for which the SL RSSI (Received Signal Strength Indication) measured by the UE exceeds the (pre-)configured threshold sensed over the CBR measurement window [na,n-1] according to the higher layer parameter sl-TimeWindowSizeCBR (SL CBR time window size), where a is equal to 100 or 100·2 μ time slots.

[0122] When the UE is configured to perform partial sensing by higher layers (including when SL DRX (Discontinuous Reception) is configured), the SL RSSI is measured in the timeslots in which the UE performs partial sensing and the UE performs PSCCH / PSSCH / SL-PRS reception within the CBR measurement window. The calculation of the SL CBR is limited to the timeslots in which the SL RSSI is measured.

[0123] When the UE is configured to receive based on the FR2 beam through the higher layer or physical layer, the SL RSSI is measured within the CBR measurement window in the time slot in which the UE receives based on a certain direction of the FR2 beam, or in the time slot in which the UE receives based on a certain RBG / wide direction of the FR2 beam, or in the time slot in which the UE receives based on all FR2 beam directions.

[0124] If the number of SLRSSI measurement slots within the CBR measurement window is below a (pre-)configured threshold, the (pre-)configured SL CBR value is used.

[0125] The above modifications apply to: RRC_IDLE (RRC idle state) intra-frequency, RRC_IDLE inter-frequency, RRC_CONNECTED (RRC connected state) intra-frequency, and RRC_CONNECTED inter-frequency.

[0126] In the above modification, the time slot index is based on the physical time slot index.

[0127] Side Link Channel Occupancy Ratio (SL CR)

[0128] The side link channel occupancy rate (SLCR) evaluated at time slot n is defined as the total number of subchannels used for transmission on the side link in time slot [na,n-1] and authorized in time slot [n,n+b] divided by the total number of configured subchannels in the transmission pool on [na,n+b].

[0129] When the UE is configured to receive based on FR2 beams by higher layers or physical layers, the total number of subchannels / frequency granularity for SL-PRS authorized in slots [n,n+b] for transmission of the sidelink in slots [na,n-1] should be based on a certain direction of the FR2 beam or a certain RBG direction of the FR2 beam or all FR2 beam directions. The total number is then divided by the total number of configured subchannels in the transmission pool on [na,n+b].

[0130] This modification applies to: RRC_IDLE same frequency, RRC_IDLE different frequency, RRC_CONNECTED same frequency, RRC_CONNECTED different frequency.

[0131] Note 1: a is a positive integer, and b is 0 or a positive integer; a and b are implemented by the UE according to the high-level parameter sl-TimeWindowSizeCR (SLCR time window size) and a+b+1=1000 or 1000·2 μ time slots, b<(a+b+1) / 2, and n+b should not exceed the last transmission opportunity granted for this transmission.

[0132] NOTE 2: SLCR is evaluated for each transmission (retransmission).

[0133] NOTE 3: When evaluating the SLCR, the UE shall assume that the transmission parameters used at slot n are reused according to the existing grant(s) in slots [n+1, n+b] without dropping packets.

[0134] NOTE 4: The slot index is based on the physical slot index.

[0135] Note 5: SL CR can be calculated per priority level.

[0136] In the above examples, CR / CBR is defined per beam or per beam group (TBG and / or RBG) or per wide beam / all beams.

[0137] Implementations related to FR2 SL CBR

[0138] For FR2 SL CBR, CBR is defined per beam. According to the higher layer parameter sl-TimeWindowSizeCBR-FR2 (SL-CBR time window size - FR2), the CBR measurement window is [na,n-1], where a is equal to m*100 or m*100·2μ time slots or other values, where m is the maximum number of UE Tx beams and / or Rx beams.

[0139] For example, for a UE, there are at most 8 beams depending on the UE capability, which means m is 8. The high-level parameters can be as follows:

[0140]

[0141] Based on a longer CBR measurement window length, the measurement accuracy and original probability of the RSSI measurement time slot in a certain beam direction can be guaranteed. Otherwise, there may be more RSSI measurement time slots with numbers lower than the (pre-)configured threshold, and then CBR will be meaningless.

[0142] If the number of SL RSSI measurement slots within the CBR measurement window is below a (pre-)configured threshold, the (pre-)configured SL CBR value is used. The configured threshold should be modified.

[0143] For FR2 SL CR, CR is defined per beam.

[0144] For a certain beam, the total number of subchannel / frequency granularities of SL-PRS authorized in time slot [n,n+b] for transmission of the side link in time slot [na,n-1] is divided by the total number of configured subchannel / frequency granularities of SL-PRS in the transmission pool on [na,n+b].

[0145] Note: a is a positive integer, and b is 0 or a positive integer; a and b are determined by the UE implementation according to the high-level parameter sl-TimeWindowSizeCR-FR2 and a+b+1=c*1000 or c*1000·2μ time slots or other values, b<(a+b+1) / 2, and n+b should not exceed the last authorized transmission opportunity for this transmission. Where c is the maximum number of UE Tx beams and / or Rx beams.

[0146] For example, for a UE, there are at most 8 beams depending on the UE capability. This means that m is 8. Therefore, the high-level parameters can be as follows:

[0147]

[0148] Based on a longer length of TimeWindowSizeCR (CR time window size), the measurement accuracy and original probability of the measurement time slot in a certain beam direction can be guaranteed. Otherwise, CR will be meaningless.

[0149] FR2 SL CR and / or CR limit (CR limitation) is related to the priority of PSCCH / PSSCH / SL-PRS / other RS / CH and / or (one or more) beam (or TBG) direction.

[0150] For example, if the UE is configured with the higher layer parameter sl-CR-Limit and transmits PSSCH / SL-PRS using a certain beam (or TBG) direction in time slot n, then for any priority value k, the UE shall ensure the following restrictions:

[0151] ∑ i≥k CR(i)≤CR Limit (k)

[0152] where CR(i) is the CR evaluated for the beam (or TBG) direction in slot nN for PSSCH / SL-PRS transmission with the "Priority" field in the SCI set to i, and CR Limit (k) corresponds to a higher-level parameter sl-CR-Limit (or to a corresponding direction of the sl-CR-Limit list), which is associated with a priority value k, a beam (or TBG) direction, and a CBR range that includes the CBR measured in time slot nN, where N is the congestion control processing time.

[0153] For different priority values ​​or different beam (or TBG) directions, there are also different SL CRs.

[0154] Depends on CR limit Whether it is related to the beam direction(s) or not, the following two cases are suggested.

[0155] Case 1: CR limit It is related to the beam direction (one or more). In this embodiment, beams with different directions have corresponding CR limit value.

[0156] For different beam (or TBG) directions, adjacent beams (or TBGs) may overlap. Therefore, the time-frequency resources of some adjacent beams (or TBGs) can be regarded as having some conflicts, and the same time-frequency resources of different beams cannot be transmitted without conflicts. limit The value is not useful for each beam (or TBG) direction, and some related beams ("correlated beams") need to share the traditional CR limit Therefore, for some traditional CR limit The relevant beams (rather than all beams) need to measure the CR and compare the measured CR with the CR limit The CR of one beam in each beam is limit Will be smaller than the traditional CR limit value.

[0157] Case 2: CR limit It has nothing to do with the beam direction. In this embodiment, beams in different directions have one CR limit value.

[0158] For different beam (or TBG) directions, the time-frequency resources can be considered as non-conflicting. Therefore, the same time-frequency resources of different beams can be transmitted without conflict. limit Values ​​are also available for each beam (or TBG) direction.

[0159] According to FR2 SL CBR and SL CR definitions, there can be more than one CR / CBR for a UE. Therefore, a CBR list and / or CR list can be introduced to accommodate CR / CBR measurements.

[0160] Based on the antenna configuration of the UE, the maximum number of beams is fixed, but the UE may transmit or receive messages using a wide beam composed of or including a group of narrow beams. For wide beam transmission and / or reception, CR / CBR may be different from conventional schemes.

[0161] For example, in Fig. 9 Considering the example of FR2 SL CR shown, the conventional CR limit The value is 20%.

[0162] If UE A sends SL-PRS1 based on narrow beam 1, the CR measurement is based on beam 1 and is included in the CR list and is consistent with the CR measurement. limit 20% for comparison.

[0163] If UE A sends SL-PRS2 based on wide beam A (TBG1 including beam 1, beam 2 and beam 3), the CR measurement scheme is based on beam 1, beam 2 and beam 3 respectively. The CR measurement scheme can obtain the CR list and then use the total measurement result and CR limit For this case, if UE A has sent SL-PRS1 with CR 10%, based on this scheme, beam A can cover SL-PRS1 and only less than CR 10% of beam A to CR limit 20%.

[0164] If UE A sends SL-PRS3 based on wide beam B (TBG2 including beam 3 and beam 4), the CR measurement scheme is based on beam 3 and beam 4 respectively, and is also related to CR limit 20% for comparison.

[0165] For example, considering the FR2 SL CBR Fig. 9 In the example of , the scheme is the same as SL CR measurement. The UEA can receive SL-PRS based on narrow beam 1, wide beam A, or wide beam B. When the UEA sends SL-PRS based on beam or TBG, the CBR measurement can be based on the beam or RBG corresponding to the TBG. The corresponding CBR or the total combined CBR is selected as the final CBR for the transmission based on the CBR list.

[0166] For a dedicated resource pool for SL-PRS, CR and / or CBR can be introduced. For quality of service (QoS), congestion control for SL-only PSSCH is considered. But now for a dedicated resource pool for SL-PRS, there is no PSSCH, and CR / CBR measurement should be based on SL-PRS. Therefore, a series of IEs about SL-PRS can be introduced for CR / CBR.

[0167] The following modifications to IE are suggested:

[0168] sl-DefaultTxConfigIndex (SL-Default Transmit Configuration Index)

[0169] Indicates the PSSCH / SL-PRS / RS or CH transmission parameters to be used by UEs that do not have available CBR measurements, by means of the index of the corresponding entry in sl-Tx-ConfigIndexList. A value of 0 indicates the first entry in sl-Tx-ConfigIndexList. If the UE has available CBR measurements, this field is ignored. sl-CBR-ConfigIndex

[0170] Indicates the CBR range to be used by the index of the entry of the CBR range configuration in the sl-CBR-RangeConfigList.

[0171] sl-MCS-RangeList (SL-MCS-Range List)

[0172] Indicates the minimum and maximum MCS values ​​of the associated MCS (modulation and coding scheme) table(s). If SL-CBR-PriorityTxConfigList-v1650 is present, the UE shall ignore the minimum and maximum MCS values ​​used by the table for 64QAM indicated in SL-CBR-PriorityTxConfigList-r16. sl-PriorityThreshold

[0173] Indicates the upper limit of the priority range associated with the configuration in sl-CBR-ConfigIndex and sl-Tx-ConfigIndexList. The upper limit of the priority range is configured in ascending order of consecutive entries of SL-PriorityTxConfigIndex in SL-CBR-PriorityTxConfigList. For the first entry of SL-PriorityTxConfigIndex, the lower limit of the priority range is 1.

[0174] SL-CBR-PriorityTxConfigList-v1650

[0175] If included, this field includes the same number of entries as SL-CBR-PriorityTxConfigList-r16, listed in the same order.

[0176] sl-CBR-RangeConfigList

[0177] Indicates a list of CBR ranges. Each entry of this list indicates the upper limit of the CBR range for the corresponding entry in SL-CBR-LevelsConfig. The upper limits of the CBR ranges are configured in ascending order of consecutive entries of sl-CBR-RangeConfigList. For the first entry of sl-CBR-RangeConfigList, the lower limit of the CBR range is 0. A value of 0 corresponds to 0, a value of 1 corresponds to 0.01, a value of 2 corresponds to 0.02, and so on.

[0178] sl-CR-Limit (SL-CR limit)

[0179] Indicates the maximum limit on occupancy. A value of 0 corresponds to 0, a value of 1 corresponds to 0.0001, a value of 2 corresponds to 0.0002, and so on (i.e., in steps of 0.0001), until a value of 10000 corresponds to 1.

[0180] sl-CBR-PSSCH-TxConfigList (SL-CBR-PSSCH-transmit configuration list)

[0181] A list of available PSSCH / SL-PRS transmission parameter (such as MCS, number of subchannels, number of retransmissions, and CR limit) configurations is indicated.

[0182] sl-TxParameters (SL-Transmit Parameters)

[0183] Indicates PSSCH / SL-PRS transmission parameters.

[0184] SL-CBR-SL-PRS-TxConfigList (SL-CBR-SL-PRS-Transmit Configuration List)

[0185] A list of available SL-PRS transmission parameter configurations (such as MCS, number of subchannels, number of retransmissions, and CR limit) is indicated.

[0186] If a UE is configured with the higher layer parameter sl-CR-Limit and transmits PSSCH / SL-PRS in time slot n, the UE shall ensure the following restrictions for any priority value k:

[0187]

[0188] where CR(i) is the CR evaluated in slot nN for PSSCH / SL-PRS transmission with the "Priority" field in the SCI set to i, and CR Limit(k) corresponds to the higher layer parameter sl-CR-Limit, which is associated with the priority value k and a CBR range including the CBR measured in time slot nN, where N is the congestion control processing time.

[0189] Fig.10 An example of a wireless communication system (e.g., long term evolution (LTE), 5G or NR cellular network) including a BS 120 and one or more user equipments (UEs) 111, 112 and 113 is shown. In some embodiments, uplink transmissions (131, 132, 133) may include uplink control information (UCI), high-layer signaling (e.g., UE assistance information or UE capabilities), or uplink information. In some embodiments, downlink transmissions (141, 142, 143) may include DCI (downlink control information) or high-layer signaling or downlink information. The UE may be, for example, a smartphone, a tablet computer, a mobile computer, a machine to machine (M2M) device, a terminal, a mobile device, and an Internet of Things (IoT) device.

[0190] Fig.11 is a block diagram representation of a portion of an apparatus according to some embodiments of the presently disclosed technology. Apparatus 205 (such as a network device or base station or wireless device (or UE)) may include processor electronics 210, such as a microprocessor that implements one or more of the various techniques presented in this document. Apparatus 205 may include transceiver electronics 215 for sending and / or receiving wireless signals through one or more communication interfaces (such as (one or more) antennas 220). Apparatus 205 may include other communication interfaces for transmitting and receiving data. Apparatus 205 may include one or more memories (not explicitly shown) configured to store information such as data and / or instructions. In some embodiments, processor electronics 210 may include at least a portion of transceiver electronics 215. In some embodiments, apparatus 205 is used to implement at least some of the disclosed techniques, modules, or functions.

[0191] Some preferred embodiments may include the following solutions.

[0192] 1. A method of wireless communication (e.g., Fig.12The method 1200 in the embodiment of the present invention comprises: receiving (1210) a first side link transmission by a first device based on receive beam information; selecting (1220) a resource set for a second side link transmission based on selection information; and sending (1230) the second side link transmission to a second device based on transmit beam information.

[0193] 2. According to the method of solution 1, the selection information includes at least one of the following items: a frequency domain index of a sidelink positioning reference signal, a delay budget,

[0194] The number of comb offsets to be used for sidelink transmission, panel identification, resource pool for which resources are to be reported, priority, or resource reservation interval.

[0195] 3. A method according to solution 1, wherein at least one of the receive beam information or the transmit beam information is obtained from at least one of the following items: sidelink control information (SCI), SCI indicating SL-PRS (sidelink positioning reference signal), PSSCH, PSCCH, PSSCH, SL-PRS or downlink control information.

[0196] 4. A method according to solution 1, wherein at least one of the receive beam information, the transmit beam information or the selection information is configured or preconfigured or predefined according to a high layer, and wherein the high layer is at least one of the following items: RRC layer, SL LPP, PC5-RRC, PC5-S, MAC layer or application layer.

[0197] 5. A method according to solution 1, wherein at least one of the receive beam information, the transmit beam information or the selection information comes from a physical layer, and wherein the physical layer is at least one of the following items: a first SCI, a second SCI, DCI3-0, an SCI for SL-PRS, or a MAC CE.

[0198] 6. The method according to solution 1, wherein the transmit beam information includes information about one or more beams in a transmit beam group, and the transmit beam information is associated with an actual transmit beam.

[0199] 7. The method according to solution 6 also includes: performing a perception process based on perception-related beam information.

[0200] 8. The method according to solution 7, wherein the perception-related beam information includes beams having opposite and / or same directions as the transmission beams in the transmission beam group.

[0201] 9. A method according to solution 7, wherein the perception-related beam information includes multiple beams included in a receiving beam group, and the receiving beam group includes beams having opposite and / or the same direction as the transmitting beams in the transmitting beam group.

[0202] 10. The method according to solution 1, wherein at least one of the transmit beam information and / or the receive beam information is received from the second device or other devices.

[0203] 11. The method according to solution 1, wherein the receiving beam information is related to the transmitting beam information.

[0204] 12. The method of solution 1, wherein the received beam information includes all beam directions received during a perception window.

[0205] 13. A method according to solution 1, wherein the received beam information contains a partial direction that is a portion of all beam directions received during a perception window.

[0206] 14. The method according to solution 1 also includes: performing a sensing process based on sensing-related beam information.

[0207] 15. A method according to solution 14, wherein the perception-related beam information is related to the transmission beam information.

[0208] 16. The method of solution 14, wherein the perception-related beam information includes information about one or more receive beams having a specific direction relative to a transmit beam included in the transmit beam information.

[0209] 17. A method according to solution 14, wherein the perception-related beam information includes a beam having an opposite and / or the same direction as the transmission beam.

[0210] 18. The method according to solution 14, wherein the perception-related beam information includes multiple beams included in a receiving beam group, and the receiving beam group includes beams having opposite and / or the same direction as the transmitting beam.

[0211] 19. A method according to any one of solutions 14 to 18, wherein the perception-related beam information is used for the second side link transmission, and the second side link transmission is sent to the second device in an additional beam direction, and the additional beam direction is included in a transmission beam group including a beam having the same direction as the direction of the transmission beam.

[0212] 20. A method according to any one of solutions 14 to 18, wherein the perception-related beam information is used for the second side link transmission, and the second side link transmission is sent to the second device in a combined beam direction, and the combined beam direction is included in a transmit beam group including a beam having the same direction as the direction of the transmit beam.

[0213] 21. A method according to any one of solutions 14 to 18, wherein the perception-related beam information is used for another side link transmission, and the other side link transmission is sent to another device according to another beam direction included in the transmit beam group or a combined beam direction included in the transmit beam group, and the transmit beam group includes a beam having the same direction as the direction of the transmit beam.

[0214] 22. The method according to solution 1 also includes: the first device performing a perception process based on perception-related beam information; and the first device reporting the selected resource set to a higher layer.

[0215] 23. The method according to solution 1 or 22, wherein the resource set is selected by selecting a beam, and the selected beam is independent of the transmission beam obtained from the transmission beam information.

[0216] 24. A method according to solution 23, wherein the selected beam has an orthogonal or approximately orthogonal spatial relationship relative to the transmit beam.

[0217] 25. The method of solution 24, wherein the resource set is selected without considering conflicts in the time-frequency domain.

[0218] 26. The method of solution 22, wherein the resource set is selected by selecting a beam, the selected beam being related to a transmit beam.

[0219] 27. A method according to solution 26, wherein the selection beam has the same, opposite, approximately the same, or approximately opposite spatial relationship with the transmission beam.

[0220] 28. The method of solution 27, wherein the resource set is selected by considering conflicts in the time-frequency domain.

[0221] 29. A method according to Solution 18, wherein sending the second side link transmission includes: sending a side link positioning reference signal (SL-PRS) using resources reserved by the receive beam information or the transmit beam, depending on the conflict level of time-frequency resources.

[0222] 30. The method according to solution 1, wherein the resource set used for the second side link transmission is also selected based on channel occupancy rate (CR) and channel busy rate (CBR).

[0223] 31. The method of solution 1, wherein the second sidelink transmission corresponds to a SL-PRS, and wherein the second sidelink transmission is sent based on a channel occupancy rate (CR) and a channel busy rate (CBR).

[0224] 32. A method according to solution 1, wherein a channel occupancy rate (CR) and a channel busy rate (CBR) are defined based on beam information provided by a higher layer or a physical layer, and the beam information includes the receiving beam information or the transmitting beam information.

[0225] 33. The method according to solution 30, wherein the channel occupancy rate and the channel busy rate are received from a higher layer.

[0226] 34. The method of solution 30, wherein the channel occupancy rate and the channel busy rate are measured by the first device.

[0227] 35. A method according to solution 34, wherein the measurement is performed by the first device, and the first device is configured to receive using the following beams: FR2 beams in a specific direction, FR2 beams in a specific receiving beam group, FR2 wide beams, or FR2 beams in all directions.

[0228] 36. The method of solution 30, wherein at least one of the channel occupancy rate or the channel busy rate is defined per beam.

[0229] 37. The method according to solution 30, wherein the channel occupancy rate (CR) and / or the CR limit (CR limit ) is related to the priority value of at least one of PSCCH, PSSCH, SL-PRS or other RS / CH, and / or is related to the beam direction.

[0230] 38. The method of solution 30, wherein at least one of a channel busy rate (CBR) list including multiple CBR measurements or a channel occupancy rate (CR) list including multiple measurements is configured for the first device.

[0231] 39. A method according to solution 34, wherein the channel busy rate (CBR) measurement window is set based on the maximum number of transmit beams and the maximum number of receive beams, and the maximum number of transmit beams and the maximum number of receive beams are provided by a higher layer.

[0232] 40. A wireless communication device, comprising a processor, wherein the processor is configured to implement the method according to any one of the above solutions.

[0233] 41. A computer storage medium having codes stored thereon, which, when executed by a processor, cause the processor to implement the method according to any one of the above solutions.

[0234] The above example embodiments are performed by a first device sending a sidelink transmission to a second device. It will be appreciated by those skilled in the art that the proposed embodiments may be modified and applied to a second device receiving a sidelink transmission from a first device. For example, the proposed embodiments may include a wireless communication method comprising: receiving, by a second device, a second sidelink transmission from a first device using a selected resource set selected as described in this patent document.

[0235] The disclosed and other embodiments, modules and functional operations described in this document can be implemented in digital electronic circuits, or in computer software, firmware or hardware (including the structures disclosed in this document and the equivalents of their structures), or in a combination of one or more of them. The disclosed and other embodiments can be implemented as one or more computer program products, that is, one or more modules of computer program instructions encoded on a computer-readable medium, which are executed by a data processing device or used to control the operation of the data processing device. The computer-readable medium can be a machine-readable storage device, a machine-readable storage matrix, a memory device, a member of a material that implements a machine-readable propagation signal, or a combination of one or more of them. The term "data processing device" includes all devices, equipment and machines for processing data, such as a programmable processor, a computer, or multiple processors or multiple computers. In addition to hardware, the device can also include code for creating an execution environment for the mentioned computer program, for example, code for building processor firmware, a protocol stack, a database management system, an operating system, or a combination of one or more of them. A propagated signal is a non-naturally generated signal, eg, a machine-generated electrical, optical, or electromagnetic signal, that is generated to encode information for transmission to suitable receiver apparatus.

[0236] A computer program (also referred to as a program, software, software application, script or code) can be written in any form of programming language, including compiled or interpreted languages, and the computer program can be called in any form, including as a stand-alone program, or as a module, component, subroutine or other unit suitable for use in a computing environment. A computer program does not necessarily correspond to a file in a file system. A program may be stored in a portion of a file storing other programs or data (e.g., one or more scripts stored in a markup language file), in a single file dedicated to the program mentioned, or in multiple collaborative files (e.g., multiple files storing one or more modules, subroutines or partial codes). A computer program can be deployed to execute on one computer or multiple computers, which are located at one site or distributed at multiple sites and interconnected by a communication network.

[0237] The processes and logic flows described in this document may be performed by one or more programmable processors executing one or more computer programs to perform functions by operating on input data and generating output. The processes and logic flows may also be performed by special purpose logic circuits, and the apparatus may also be implemented as special purpose logic circuits, such as FPGAs (field programmable gate arrays) or ASICs (application specific integrated circuits).

[0238] Processors suitable for executing computer programs include, for example, general and special purpose microprocessors, and any one or more processors of any type of digital computer. Typically, the processor will receive instructions and data from a read-only memory or a random access memory or both. The essential elements of a computer are a processor for executing instructions and one or more memory devices for storing instructions and data. Typically, a computer will also include or be operably coupled to one or more mass storage devices (e.g., disks, magneto-optical disks, or optical disks) for storing data, to receive data therefrom or to transmit data thereto or both situations exist. However, a computer need not have such devices. Computer-readable media suitable for storing computer program instructions and data include all forms of nonvolatile memory, media and memory devices, including, for example: semiconductor memory devices, such as EPROM (Erasable Programmable Read Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory) and flash memory devices; magnetic disks, such as internal hard disks or removable disks; magneto-optical disks; and CD ROM (Compact Disc Read-Only Memory) and DVD-ROM (Digital Video Disc-ReadOnly Memory) disks. The processor and memory may be supplemented by, or incorporated into, special purpose logic circuitry.

[0239] Although this document contains many details, these details should not be interpreted as limitations on the scope of the claimed invention or the scope of the invention that may be claimed, but should be interpreted as descriptions of features specific to a particular embodiment. In this document, certain features described in the context of different embodiments may also be implemented in combination in a single embodiment. Conversely, the various features described in the context of a single embodiment may also be implemented separately or in any suitable sub-combination in multiple embodiments. In addition, although features may be described above as working in certain combinations, and even if initially claimed, in some cases, one or more features from the claimed combination may be removed from the combination, and the claimed combination may be for a sub-combination or a variation of the sub-combination. Similarly, although operations are depicted in a particular order in the accompanying drawings, this should not be understood as requiring the operations to be performed in the particular order shown or in sequence, or requiring the execution of all the operations shown to achieve the desired result.

[0240] Only some examples and implementations are disclosed. Variations, modifications and enhancements to the described examples and implementations as well as other implementations may be made based on what is disclosed.

Claims

1. A method of wireless communication, comprising: receiving, by the first device, a first sidelink transmission based on the receive beam information; selecting a resource set for a second sidelink transmission based on the selection information; as well as The second sidelink transmission is sent to the second device based on the transmit beam information.

2. The method according to claim 1, wherein: The selection information includes at least one of the following items: a frequency domain index of a sidelink positioning reference signal, a delay budget, a number of comb offsets to be used for sidelink transmission, a panel identifier, a resource pool in which resources are to be reported, a priority, or a resource reservation interval.

3. The method according to claim 1, wherein: At least one of the receive beam information or the transmit beam information is obtained from at least one of the following items: sidelink control information (SCI), SCI indicating SL-PRS (sidelink positioning reference signal), PSSCH, PSCCH, PSSCH, SL-PRS or downlink control information.

4. The method according to claim 1, wherein: At least one of the receive beam information, the transmit beam information or the selection information is configured or preconfigured or predefined according to a high-level layer, and wherein the high-level layer is at least one of the following items: RRC layer, SLLPP, PC5-RRC, PC5-S, MAC layer or application layer.

5. The method according to claim 1, wherein: At least one of the receive beam information, the transmit beam information or the selection information comes from a physical layer, and wherein the physical layer is at least one of the following items: a first SCI, a second SCI, DCI3-0, an SCI for SL-PRS, or a MAC CE.

6. The method according to claim 1, wherein: The transmission beam information includes information on one or more beams in a transmission beam group, and the transmission beam information is associated with an actual transmission beam.

7. The method according to claim 6, further comprising: The sensing process is performed based on the sensing related beam information.

8. The method according to claim 7, wherein: The perception-related beam information includes beams having directions opposite to and / or the same as those of the transmission beams in the transmission beam group.

9. The method according to claim 7, wherein: The sensing-related beam information includes a plurality of beams included in a reception beam group including beams having directions opposite to and / or the same as those of the transmission beams in the transmission beam group.

10. The method according to claim 1, wherein: At least one of the transmit beam information and / or the receive beam information is received from the second device or other devices.

11. The method according to claim 1, wherein: The receive beam information is related to the transmit beam information.

12. The method according to claim 1, wherein: The receiving beam information includes all beam directions received during the sensing window.

13. The method according to claim 1, wherein: The receive beam information includes a partial direction that is a portion of all beam directions received during a perception window.

14. The method according to claim 1, further comprising: The sensing process is performed based on the sensing related beam information.

15. The method according to claim 14, wherein: The perception-related beam information is related to the transmission beam information.

16. The method according to claim 14, wherein: The perception-related beam information includes information about one or more reception beams having specific directions relative to the transmission beam included in the transmission beam information.

17. The method according to claim 14, wherein: The sensing-related beam information includes beams having opposite and / or same directions as the transmit beam.

18. The method according to claim 14, wherein: The sensing-related beam information includes a plurality of beams included in a reception beam group, wherein the reception beam group includes beams having a direction opposite to and / or the same as that of the transmission beam.

19. The method according to any one of claims 14 to 18, wherein: The perception-related beam information is used for the second side link transmission, which is sent to the second device in an additional beam direction, and the additional beam direction is included in a transmission beam group including a beam having a direction same as the direction of the transmission beam.

20. The method according to any one of claims 14 to 18, wherein: The perception-related beam information is used for the second side link transmission, which is sent to the second device in a combined beam direction, and the combined beam direction is included in a transmission beam group including a beam having a direction same as the direction of the transmission beam.

21. The method according to any one of claims 14 to 18, wherein: The perception-related beam information is used for other side link transmission, and the other side link transmission is sent to another device according to another beam direction included in the transmission beam group or a combined beam direction included in the transmission beam group, and the transmission beam group includes a beam having the same direction as the direction of the transmission beam.

22. The method of claim 1, further comprising: The first device performs a sensing process based on the sensing-related beam information; as well as The first device reports the selected resource set to a higher layer.

23. The method according to claim 1 or 22, wherein: The resource set is selected by selecting a beam, and the selected beam is independent of the transmission beam obtained from the transmission beam information.

24. The method according to claim 23, wherein: The selected beam has an orthogonal or approximately orthogonal spatial relationship with respect to the transmit beam.

25. The method according to claim 24, wherein: The resource set is selected without considering conflicts in the time-frequency domain.

26. The method of claim 22, wherein: The resource set is selected by selecting a beam, and the selected beam is associated with a transmission beam.

27. The method according to claim 26, wherein: The selection beam has the same, opposite, substantially the same, or substantially opposite spatial relationship as the transmit beam.

28. The method according to claim 27, wherein: The resource sets are selected by considering conflicts in the time-frequency domain.

29. The method of claim 18, wherein: Sending the second side link transmission includes sending a side link positioning reference signal (SL-PRS) using resources reserved by the receive beam information or the transmit beam depending on the conflict level of time-frequency resources.

30. The method of claim 1, wherein: The resource set used for the second sidelink transmission is also selected based on a channel occupancy rate (CR) and a channel busy rate (CBR).

31. The method of claim 1, wherein: The second sidelink transmission corresponds to a SL-PRS, and wherein the second sidelink transmission is sent based on a channel occupancy rate (CR) and a channel busy rate (CBR).

32. The method of claim 1, wherein: The channel occupancy rate (CR) and the channel busy rate (CBR) are defined based on the beam information provided by the higher layer or the physical layer, and the beam information includes the receiving beam information or the transmitting beam information.

33. The method of claim 30, wherein: The channel occupancy rate and the channel busy rate are received from a higher layer.

34. The method of claim 30, wherein: The channel occupancy rate and the channel busy rate are measured by the first device.

35. The method of claim 34, wherein: The measurement is performed by the first device, which is configured to receive using a FR2 beam in a specific direction, a FR2 beam in a specific receive beam group, a FR2 wide beam, or a FR2 beam in all directions.

36. The method of claim 30, wherein: At least one of the channel occupancy rate or the channel busy rate is defined by beam.

37. The method of claim 30, wherein: The channel occupancy rate (CR) and / or the CR limit (CR limit ) is related to the priority value of at least one of PSCCH, PSSCH, SL-PRS or other RS / CH, and / or is related to the beam direction.

38. The method of claim 30, wherein: At least one of a channel busy rate (CBR) list including a plurality of CBR measurements or a channel occupancy rate (CR) list including a plurality of measurements is configured for the first device.

39. The method of claim 34, wherein: The channel busy rate (CBR) measurement window is set based on the maximum number of transmit beams and the maximum number of receive beams, which are provided by a higher layer.

40. A wireless communication apparatus comprising a processor configured to implement the method according to any one of the preceding claims.

41. A computer storage medium having stored thereon codes which, when executed by a processor, cause the processor to implement the method according to any one of the preceding claims.

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