Method and apparatus for collision control for sidelink communication in wireless communication system

Abstract

A method performed by a wireless communication device includes determining whether to transmit a first sidelink synchronization signal (SLSS) according to a priority parameter when an opportunity of the first SLSS collides with a physical sidelink feedback channel (PSFCH) carrying sidelink feedback control information (SFCI). The priority parameter is associated with a physical sidelink shared channel (PSSCH) corresponding to the PSFCH.

Description

[0001] This application is a divisional application with application number 201980082613.5 (PCT / CN2019 / 124581), application date December 11, 2019, and invention name “Method and device for conflict control for side link communication in a wireless communication system”.

[0002] CROSS-REFERENCE TO RELATED APPLICATIONS

[0003] This application claims the benefit of and priority to U.S. Provisional Patent Application No. 62 / 779,597, filed on December 14, 2018, entitled Method and Apparatus for SFCI feedback enhancement in V2Xunicast and groupcast, and having Attorney Docket No. US75833 (hereinafter referred to as the US75833 application). The disclosure of the US75833 application is hereby fully incorporated by reference into this application. Technical Field

[0004] The present disclosure relates generally to wireless communications, and more particularly, to methods and apparatus for contention control for sidelink communications in a wireless communication system. Background Art

[0005] A wireless communication system may support direct communication between wireless communication devices (e.g., User Equipment (UE)). Examples of direct communication include device-to-device (D2D) communication, vehicle-to-everything (V2X) communication, etc. Direct communication may also be referred to as sidelink communication. Sidelink communication allows two or more wireless communication devices (e.g., UE) to communicate with each other without the need for a base station (or any other intermediate device).

[0006] However, when a wireless communication device is configured to perform transmission or reception on two or more physical sidelink channels at the same time, conflicts may occur. Therefore, there is a need in the art to provide a method and apparatus for conflict control for sidelink communication in a wireless communication system. Summary of the invention

[0007] The present disclosure relates to methods and apparatus for contention control for sidelink communications in a wireless communication system.

[0008] According to another aspect of the present disclosure, a wireless communication device is provided. The wireless communication device includes: one or more non-transitory computer-readable media, the one or more non-transitory computer-readable media having computer-executable instructions contained thereon; and at least one processor, the at least one processor coupled to the one or more non-transitory computer-readable media. The at least one processor is configured to execute the computer-executable instructions to: when the timing of a first sidelink synchronization signal (Sidelink Synchronization Signal: SLSS) conflicts with a physical sidelink feedback channel (Physical Sidelink Feedback Channel: PSFCH) carrying sidelink feedback control information (Sidelink Feedback Control Information: SFCI), execute the computer-executable instructions to determine whether to transmit the first SLSS according to a priority parameter. The priority parameter can be associated with a physical sidelink shared channel (Physical Sidelink Shared Channel: PSSCH) corresponding to the PSFCH.

[0009] According to another aspect of the present disclosure, a method performed by a wireless communication device is provided. The method includes determining whether to transmit the first SLSS according to a priority parameter when the timing of the first SLSS conflicts with the PSFCH carrying the SFCI. The priority parameter may be associated with the PSSCH corresponding to the PSFCH. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Various aspects of the present exemplary disclosure may be best understood from the following detailed description when read in conjunction with the accompanying drawings. Various features are not drawn to scale, and the size of various features may be arbitrarily expanded or reduced for clarity of discussion.

[0011] Figure 1 A V2X wireless communication network 100 according to an exemplary embodiment of the present disclosure is shown.

[0012] Figure 2 An example SLSS format of the SLSS according to an exemplary embodiment of the present disclosure is shown.

[0013] Figure 3A is a flowchart of a method of handling a conflict between a PSFCH and a SLSS according to an exemplary embodiment of the present disclosure.

[0014] Figure 3B is a flowchart of a method of handling a conflict between a PSFCH and a SLSS according to an exemplary embodiment of the present disclosure.

[0015] Figure 4 2 is a schematic diagram showing that the timings of PSFCH and SLSS conflict according to an exemplary embodiment of the present disclosure.

[0016] Figure 5A is a schematic diagram illustrating UEs belonging to different groups according to an exemplary embodiment of the present disclosure.

[0017] Figure 5B 1 is a flowchart of a method in which a wireless communication device performs SLSS transmission with different groups according to an exemplary embodiment of the present disclosure.

[0018] Figure 6 is a schematic diagram illustrating an example architecture of a base station according to an exemplary embodiment of the present disclosure.

[0019] Figure 7 is a schematic diagram illustrating an example architecture of a UE according to an exemplary embodiment of the present disclosure.

[0020] Figure 8 is a schematic diagram showing several BWPs configured in different component carriers (CCs) according to an exemplary embodiment of the present disclosure.

[0021] Fig. 9 is a block diagram illustrating a node for wireless communication according to various aspects of the present disclosure. DETAILED DESCRIPTION

[0022] The following description contains specific information related to exemplary embodiments of the present disclosure. The drawings and the detailed descriptions accompanying the drawings in the present disclosure are exemplary embodiments only. However, the present disclosure is not limited to these exemplary embodiments. Other variations and embodiments of the present disclosure will occur to those skilled in the art. Unless otherwise specified, the same or corresponding components in the drawings may be represented by the same or corresponding figure numbers. In addition, the drawings and illustrations in the present disclosure are generally not drawn to scale and are not intended to correspond to actual relative sizes.

[0023] For the purpose of consistency and ease of understanding, the same features are marked by the same reference numerals in the exemplary drawings (although not so marked in some examples). However, the features in different embodiments may be different in other aspects, so they should not be narrowly limited to the features shown in the drawings.

[0024] Descriptions using the phrase "one embodiment" or "some embodiments" may each refer to one or more of the same or different embodiments. The term "coupled" is defined as connected directly or indirectly through intermediate components, and is not necessarily limited to physical connections. The term "comprising" when used means "including but not necessarily limited to"; it expressly indicates open inclusion or members of the described combinations, groups, series, and equivalents. The phrase "at least one of A, B, and C" or "at least one of the following: A, B, and C" means "only A, or only B, or only C, or any combination of A, B, and C."

[0025] Furthermore, for the purpose of explanation and non-limiting, specific details such as functional entities, technologies, protocols, standards and equivalents are set forth to provide an understanding of the described technology. In other examples, detailed descriptions of well-known methods, technologies, systems, architectures and equivalents are omitted to avoid unnecessary details that obscure the description.

[0026] Those skilled in the art will immediately recognize that any (one or more) network functions or (one or more) algorithms described in this disclosure may be implemented by hardware, software, or a combination of software and hardware. The functions described may correspond to modules, which may be software, hardware, firmware, or any combination thereof. Software implementations may include computer executable instructions stored on a computer-readable medium such as a memory or other type of storage device. For example: one or more microprocessors or general-purpose computers with communication processing capabilities may be programmed with corresponding executable instructions and execute the described (one or more) network functions or (one or more) algorithms. The microprocessor or general-purpose computer may be composed of an application-specific integrated circuit (ASIC), a programmable logic array, and / or using one or more digital signal processors (DSPs). Although several exemplary embodiments described in this specification are for software installed and executed on computer hardware, alternative exemplary embodiments implemented as firmware or hardware or a combination of hardware and software are also within the scope of this disclosure.

[0027] Computer readable media may include, but are not limited to, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), flash memory, compact disk read-only memory (CD-ROM), magnetic cassettes, magnetic tapes, disk storage devices, or any other equivalent medium capable of storing computer readable instructions.

[0028] A radio communication network architecture (e.g., a Long-Term Evolution (LTE) system, a Long-Term Evolution (LTE-Advanced) system, a LTE-Advanced Pro system, or a 5G New Radio (NR) radio access network (RAN)) may typically include at least one base station, at least one user equipment (UE), and one or more optional network components that provide a connection to the network. The UE communicates with a network (e.g., a Core Network (CN), an Evolved Packet Core (EPC) network, an Evolved Universal Terrestrial Radio Access Network (E-UTRAN), a Next-Generation Core (NGC), a 5G Core Network (5GC), or the Internet) via a Radio Access Network (RAN) established by one or more base stations.

[0029] It should be noted that in the present application, UE may include but is not limited to a mobile base station, a mobile terminal or device or a user communication radio terminal. For example, UE may be a portable radio device, including but not limited to a mobile phone, a tablet computer, a wearable device, a sensor, a vehicle or a personal digital assistant (PDA) with wireless communication capabilities. UE may be configured to receive and transmit signals to one or more cells in a radio access network via an air interface.

[0030] The base station is configured according to at least one of the following radio access technologies (RAT) so that the base station provides communication services: Worldwide Interoperability for Microwave Access (WiMAX), Global System for Mobile Communications (GSM, commonly referred to as 2G), GSM Enhanced Datarates for GSM Evolution (EDGE) Radio Access Network (GERAN), General Packet Radio Service (GPRS), Universal Mobile Telecommunications System (UMTS, commonly referred to as 3G) based on Wideband Code Division Multiple Access (W-CDMA), High-Speed ​​Packet Access (HSPA), LTE, LTE-A, Evolved Long-Term Evolution (eLTE, such as LTE connected to 5GC), NR (commonly referred to as 5G) and / or LTE-A Pro. However, the scope of the present application should not be limited to the above protocols.

[0031] A base station may include, but is not limited to, a Node B (NB) in UMTS, an evolved Node B (eNB) in LTE or LTE-A, a Radio Network Controller (RNC) in UMTS, a Base Station Controller (BSC) in GSM / GERAN, a Next Generation Evolved Node B (ng-eNB) in an E-UTRA base station connected to a 5GC, a Next Generation Node B (gNB) in a 5G RAN, and any other device capable of controlling radio communications and managing radio resources within a cell. A base station may serve one or more UEs via a radio interface.

[0032] A base station is operable to provide radio coverage to a specific geographical area using a plurality of cells forming a radio access network. The base station may support the operation of cells. Each cell may be operated to provide services to at least one UE within its radio coverage. More specifically, each cell (commonly referred to as a service cell) may provide services to serve one or more UEs within its radio coverage (e.g., each cell schedules downlink resources and uplink (uplink is optional) resources to at least one UE within its radio coverage for downlink and uplink (uplink is optional) packet transmission). The base station may communicate with one or more UEs in a radio communication system through a plurality of cells. A cell may allocate side link (SL) resources that support Proximity Service (ProSe) or Vehicle to Everything (V2X) services. Each cell may have a coverage area that overlaps with other cells.

[0033] As described above, the frame structure of NR supports flexible configuration to adapt to various next-generation (e.g., 5G) communication requirements, such as enhanced Mobile Broadband (eMBB), Massive Machine Type Communication (mMTC), Ultra-Reliable and Low-Latency Communication (URLLC), while meeting high reliability, high data rate, and low latency requirements. As agreed in the 3rd Generation Partnership Project (3GPP), Orthogonal Frequency Division Multiplexing (OFDM) technology can be used as the baseline for the NR waveform. Scalable OFDM parameter sets such as adaptive subcarrier spacing, channel bandwidth, and cyclic prefix (CP) can also be used. In addition, two coding schemes for NR are considered: (1) Low-Density Parity-Check (LDPC) and (2) Polar Code. Coding scheme adaptability can be configured based on channel conditions and / or service applications.

[0034] In addition, it is also considered that in the transmission time interval TX of a single NR frame, at least downlink transmission data, protection period and uplink transmission data should be included, wherein each part of DL transmission data, protection period and UL transmission data should also be configurable, for example: based on NR network dynamics. In addition, secondary link resources can also be provided in the NR frame to support ProSe services or V2X services.

[0035] In addition, the terms "system" and "network" are used interchangeably herein. The term "and / or" is used herein only to describe the association relationship of associated objects, and indicates that three relationships may exist. For example: A and / or B may indicate: A exists alone, A and B exist at the same time, or B exists alone. In addition, the character " / " generally indicates herein that the former and the latter associated objects are in an "or" relationship.

[0036] Figure 1 FIG. 1 shows a V2X wireless communication network 100 according to an exemplary embodiment of the present disclosure. Figure 1 As shown, the V2X wireless communication network 100 may include a base station 102 and several UEs 104, 106, 108, and 110. Some UEs (e.g., UEs 104 and 106) may be within the signal coverage area of ​​the base station 102, while other UEs (e.g., UEs 108 and 110) may be outside the signal coverage area. UEs 104 and 106 may communicate with the base station 102 via downlink or uplink transmissions, and communicate with each other via sidelink transmissions. For example, UE 104 may transmit data and control information to UE 106 via PSSCH and a physical sidelink control channel (PSCCH), respectively, and UE 106 may transmit data to UE 104 via a physical sidelink feedback channel (PSFCH). UE 104 and / or UE 106 may further communicate with UEs (e.g., UEs 108 and 110) outside the coverage area via sidelink transmissions. UEs 108 and 110 may also perform sidelink transmissions to communicate with each other (and with UEs 104 and 106).

[0037] In some embodiments of the present invention, the PSFCH may be used to carry sidelink feedback control information (SFCI). The PSFCH may be transmitted in a unicast or multicast manner. The SFCI may include hybrid automatic repeat request (HARQ) information (e.g., Acknowledgement (ACK) or Negative-Acknowledgement (NACK)) of the PSSCH associated with the PSFCH.

[0038] In some embodiments of the present invention, the UE may transmit or receive one or more sidelink synchronization signals (Sidelink Synchronization Signal: SLSS) via a sidelink channel. SLSS transmission may be triggered by the UE based on channel conditions. In some embodiments of the present invention, when the UE finds that there is no valid synchronization source (e.g., Global Navigation Satellite System (GNSS)), the UE may transmit the SLSS. In some embodiments of the present invention, the SLSS may be an LTE or NR V2X synchronization signal. In some embodiments of the present invention, the SLSS may be an independent reference signal, which may be included in a sidelink synchronization signal / physical broadcast channel block (Signal Broadcast Channel Block: S-SSB), or may be included in a sidelink channel for sidelink synchronization (e.g., a reference signal provided in the sidelink via PSSCH, PSCCH, etc.). In addition, the UE may perform sidelink transmissions (e.g., SLSS transmissions) on multiple carriers / bandwidth parts (Bandwidth Part: BWP) / resource pools simultaneously. Therefore, the preconfigured (or configured) resource or channel of the synchronization signal may overlap with another physical resource or channel. In addition, different physical channels or physical signals of the same or different sessions or links may also overlap with each other. In this case, the UE may decide to discard part of (one or more) physical signals or (one or more) physical channels (for example, if the UE only supports half-duplex functionality, when the UE cannot transmit and receive data at the same time, when the UE cannot perform transmission and reception simultaneously with different subcarrier spacings (SCS), etc.). In addition, even if operating in a single BWP / carrier / resource pool, the UE may be associated with (or connected to) multiple base stations (for example, a base station supporting V2X functionality), or may perform sidelink operations simultaneously in unicast and multicast modes. In view of this, some embodiments of the present invention provide a control mechanism for sidelink communication conflicts in a wireless communication system. It should be noted that the conflict control mechanism may be applicable to UEs participating in unicast, broadcast or multicast operations.

[0039] Figure 2 An example SLSS format 200 of an SLSS according to an exemplary embodiment of the present disclosure is shown. Figure 2As shown, the SLSS format 200 may include at least one Automatic Gain Control (AGC) symbol 202, a plurality of Primary Synchronization Signal (PSS) symbols 204 and 206, a plurality of Demodulation Reference Signal (DMRS) symbols 208, 210 and 212, a plurality of Secondary Synchronization Signal (SSS) symbols 214 and 216, and a protection symbol 218. In some embodiments of the present invention, the SLSS format 200 may also include at least one Sidelink Physical Broadcast Channel (S-PBCH) symbol (not shown in the figure).

[0040] According to Out-Of-Coverage (OOC) operation in a V2X wireless communication network, an OOC UE (e.g., Figure 1 UE 108 shown in FIG. 10A ) can act as a synchronization source to provide synchronization information to another OOC UE (e.g., Figure 1 110 shown in ) transmits (one or more) SLSS. In some embodiments of the present invention, whether the UE transmits (one or more) SLSS (e.g., alone and without receiving an instruction, for example, from a base station) may depend on a reference signal received power (RSRP) value of the SLSS received from another synchronization source. For example, if the RSRP value is less than a threshold, the UE may decide to transmit (one or more) SLSS externally to act as a synchronization source. The threshold may be pre-configured (e.g., stored in the UE) or may be configured by a network (e.g., a base station). In some embodiments of the present invention, the value of the threshold may be set to infinity so that the UE may always transmit (one or more) SLSS externally. In some other embodiments, the value of the threshold may be set to negative infinity so that the UE may never transmit (one or more) SLSS.

[0041] In some embodiments of the present invention, the UE may turn on / off the SLSS transmission process according to a special indicator (e.g., information element (IE), slss-TxDisabled, etc.). The indicator may be a one-bit indicator that may be provided in a radio resource control (RRC) signaling or in a system information block (SIB).

[0042] In a V2X wireless communication network, when a UE is configured to receive scheduling information from another UE in a scheduling task, the UE may be considered a receiving UE (RX UE), and when a UE is configured to transmit scheduling information to another UE (e.g., RX UE) in a scheduling task, the UE may be considered a transmitting UE (TX UE). The TX UE may be a scheduler UE (or header UE) within a group. For those UEs in the same group, the same group identity (Identity: ID) may be assigned to them. The scheduler UE may be a road site unit (RSU) or a vehicle responsible for handling the scheduling of all UEs in the group.

[0043] In some embodiments of the present invention, the role of the UE may be determined as a TX UE or an RX UE according to the scheduling task. For example, when the RX UE receives a scheduling task in the first group, the RX UE in the first group may also be a TX UE in the second group.

[0044] In some embodiments of the present invention, the SLSS transmission configuration may include a one-bit indicator. For example, the UE may be configured to transmit (one or more) SLSS when the indicator is set to "1" and not to transmit (one or more) SLSS when the indicator is set to "0". It should be noted that the In-Coverage (IC) UE (e.g., Figure 1 UE 104 and 106 shown in FIG. 1 ) may perform Mode 2 scheduling.

[0045] In some embodiments of the present invention, the SLSS transmission configuration can be provided by a scheduler source device (e.g., a TX / scheduler / header UE, gNB, or eNB in ​​a group) via downlink control information (DCI), sidelink control information (SCI), medium access control (MAC)-control element (MAC-CE) (e.g., from a PC5 or Uu interface), RRC signaling (e.g., from a PC5 or Uu interface), SIB (from a PC5 or Uu interface), or a master information block (MIB) (e.g., from a PC5 or Uu interface).

[0046] In some embodiments of the present invention, whether to perform SLSS transmission (e.g., transmit one or more SLSS) may depend on the regional ID of the RX UE and the scheduler source device. For example, if the difference between the values ​​of the regional ID of the RX UE and the scheduler source device is greater than a predefined / preconfigured / configured threshold, which means that the RX UE may be geographically far away from the scheduler source device, the RX UE may become a synchronization source and transmit (one or more) SLSS. On the contrary, if the difference between the values ​​of the regional ID of the RX UE and the scheduler source device is less than or equal to the threshold, the RX UE may not transmit the SLSS. In some embodiments of the present invention, the RX UE may consider both the regional ID and the received SLSS signal quality when determining whether to transmit (one or more) SLSS. For example, if the RSRP values ​​of the SLSS received from different scheduler source devices are similar, the RX UE may consider the difference in the value of the regional ID to determine whether to transmit (one or more) SLSS.

[0047] In some embodiments of the present invention, the regional ID of the RX UE may be derived from the geographic location of the RX UE (e.g., determined by GNSS) or geographic related information provided by the scheduler source device. In addition, the regional ID of the scheduler source device may be transmitted to the RX UE via DCI / SCI / MAC-CE (e.g., from PC5 or Uu interface) / RRC (e.g., from PC5 or Uu interface) / SIB (e.g., from PC5 or Uu interface) / MIB (e.g., from PC5 or Uu interface).

[0048] In some embodiments of the present invention, once the RX UE receives multiple SLSS transmission configurations from different groups or clusters, if the resource allocations of the SLSSs do not overlap, the RX UE may transmit the SLSS based on the received SLSS transmission configurations. On the contrary, if some resource allocations of the SLSSs overlap partially or completely, the RX UE may select one of the SLSS transmission configurations to perform SLSS transmission, and may discard the other received (one or more) SLSS transmission configurations. The rules for selecting the SLSS transmission configuration may be based on the following: 1) UE implementation; 2) corresponding priority indicators of the SLSS transmission configurations; and / or 3) default selection rules (e.g., transmitting (one or more) SLSS based on the most recently received SLSS transmission configuration). In some embodiments of the present invention, the SLSS transmission configuration may be configured on a resource pool / BWP / carrier basis. If these resource pools / BWP / carriers overlap, the rules for selecting the SLSS transmission configuration may be applied to the overlapping areas between different resource pools / BWP / carriers.

[0049] In some embodiments of the present invention, the UE may not perform SLSS transmission on resource pools / BWPs / carriers that are not associated with the UE.

[0050] In some embodiments of the present invention, if the UE is not a scheduler / header UE in a group / cluster, the UE may not perform SLSS transmission. For example, the UE may be configured as a scheduler / header UE through higher layer signaling such as sidelink RRC (SL-RRC) signaling, RRC signaling, or PC5-S signaling. In some embodiments of the present invention, the UE may need to send a request to the scheduler / header UE in the group / cluster to join the group / cluster.

[0051] In some embodiments of the present invention, if the UE becomes a scheduler / header UE in a group / cluster, the UE may start performing SLSS transmission. It should be noted that the UE may become a scheduler / header UE due to the configuration of the network or a previous scheduler UE. For example, when the UE becomes a scheduler / header UE based on the configuration of the base station, the SLSS transmission configuration may be mandatory attached in the pre-configuration or RRC configuration.

[0052] In some embodiments of the present invention, the RX UE may receive a first SLSS transmission configuration and a second SLSS transmission configuration from a scheduler source device, wherein the content of the second SLSS transmission configuration may be different from the content of the first SLSS transmission configuration. For example, the second SLSS transmission configuration may include a different TX power, a different time domain / frequency domain resource allocation, or a different time domain / frequency domain offset from the first SLSS transmission configuration. In this way, the RX UE of the group that may be in the middle / edge area of ​​the group may act as a synchronization source for UEs outside the group, and at the same time, the RX UE may avoid causing interference with other UEs in the group. For example, when the RX UE is located in the middle (or edge) area of ​​the group, the scheduler UE of the group may instruct the RX UE to perform SLSS transmission for the UE on the edge area of ​​the group based on the second SLSS transmission configuration. On the other hand, the scheduler UE of the group may perform SLSS transmission to the UE within the group based on the first SLSS transmission configuration. Therefore, interference to the SLSS of UEs outside / inside the group may be reduced.

[0053] In some embodiments of the present invention, the RX UE may receive a first SLSS transmission configuration and a second SLSS transmission configuration from a first scheduler source device and a second scheduler source device, respectively. The first scheduler source device and the second scheduler source device may belong to a first group (or cluster) and a second group (or cluster), respectively. The RX UE may be connected to / belong to the first group and the second group at the same time. In some embodiments of the present invention, since the base station provides one of the SLSS transmission configurations (e.g., the first SLSS transmission configuration), if the resource allocation of the SLSS transmission configuration provided by the base station overlaps with the resource allocation of the other SLSS transmission configurations, the RX UE may ignore the other SLSS transmission configurations (e.g., the second SLSS transmission configuration).

[0054] In some embodiments of the present invention, one or more SLSSIDs may be reserved for multicasting so that a scheduler UE of the group (or a UE associated with the group) may generate a synchronization signal based on the SLSSID reserved for the group. In some embodiments of the present invention, the SLSSID of the UE may be obtained from the group ID of the group to which the UE belongs. In some embodiments of the present invention, the SLSSID may be configured by the base station. For example, the UE may determine the corresponding SLSSID by the following equation:

[0055] SLSSID=module(group ID, X)+Y, where X and Y can be default values ​​or values ​​configured (or broadcast) by the base station.

[0056] In some embodiments of the present invention, the RX UE may determine whether to provide an associated group / cluster for a received physical sidelink broadcast channel (PSBCH) / SCI / PSCCH / PSSCH based on the group ID by using, for example, scrambled cyclic redundancy check (CRC) bits or sequences. The group ID may be included in the DCI / SCI / MAC-CE (e.g., from PC5 or Uu) / RRC (e.g., from PC5 or Uu) / SIB (e.g., from PC5 or Uu) / MIB (e.g., from PC5 or Uu).

[0057] As described above, SFCI may include HARQ information and / or channel state information (CSI) reports transmitted from RX UE to TX UE. SFCI may be transmitted via dedicated channels such as PSFCH. In some embodiments of the present invention, the timing / frequency resource allocation for SFCI may be dynamically indicated by TX UE. In some other embodiments, the time offset between the timing / frequency resource of SFCI and the time slot in which the UE receives SCI in the corresponding PSCCH may be fixed. However, in both SFCI resource allocation methods, SFCI resources (or PSFCH) may still conflict with resources transmitted by SLSS. Therefore, this article describes a technique for handling conflicts between PSFCH and SLSS resources.

[0058] Figure 3A is a flowchart of a method of handling a conflict between a PSFCH and a SLSS according to an exemplary embodiment of the present disclosure.

[0059] In action 302, the wireless communication device may obtain a priority parameter associated with a PSFCH corresponding to a PSSCH carrying the SFCI. In some embodiments of the present invention, the priority parameter may be a short range communication data packet priority (PPPP) parameter of the PSSCH, or may be associated with (or obtained from) one or more quality of service (QoS) parameters (e.g., parameters related to delay). In some embodiments of the present invention, the priority parameter may be included in the SCI carried on the PSSCH. In some embodiments of the present invention, the wireless communication device may be a UE or a scheduler source device in a group.

[0060] In action 304, the wireless communication device may determine whether the timing of the SLSS conflicts with the PSFCH. In some embodiments of the present invention, the timing of the SLSS and the PSFCH may be configured on different BWPs, different resource pools, and / or different carriers.

[0061] In some embodiments of the present invention, SLSS can be as follows Figure 2 LTE SLSS shown. In some embodiments of the present invention, the SLSS may be an NR SLSS that may be transmitted within an S-SSB. In some embodiments of the present invention, the SLSS may be an LTE SLSS, an LTE PBCH, an NR SLSS, an NR PBCH, or an NR SSB.

[0062] In some embodiments of the present invention, when the timing of SLSS overlaps with PSFCH in at least one orthogonal frequency division multiplexing (OFDM) symbol in the time domain, it can be determined that the timing of SLSS conflicts with PSFCH. In some embodiments of the present invention, when the timing of SLSS overlaps with PSFCH in at least one resource element, it can be determined that the timing of SLSS conflicts with PSFCH. In some embodiments of the present invention, if the wireless communication device cannot perform transmission with different SCSs at the same time, and / or cannot use different beams / spatial filters to transmit / receive signals and channels at the same time, then when at least a portion of SLSS and PSFCH are configured to be transmitted simultaneously through multiple spatial filters (if SLSS and PSFCH correspond to separate spatial quasi-co-location (QCL) assumptions or spatial filters), it can be determined that SLSS conflicts with PSFCH. In some embodiments of the present invention, the wireless communication device can transmit UE capability information to the network or another wireless communication device to indicate the number of antenna panels and / or spatial domain filters that it can use simultaneously.

[0063] If the timing of the SLSS conflicts with the PSFCH, then in action 306, the wireless communication device may determine whether to transmit the SLSS according to the priority parameter.

[0064] For example, if the PSFCH corresponds to a PSSCH with a higher priority than the SLSS transmission (e.g., a low PPPP in the scheduling SCI), the wireless communication device may not transmit the SLSS. In some embodiments of the present invention, the value of the priority parameter (also referred to as the priority value) may be mapped to a preset priority value configured for the PSCCH or PSSCH. For example, the network may configure a priority value of "4" for the SLSS and a priority value of "7" for the PSSCH via RRC signaling. In this case, the priority value of the PSFCH may follow its corresponding PSSCH, so the PSFCH may have a lower priority than the SLSS (in a configuration with a lower priority value, the higher the priority).

[0065] In contrast, if the timing of the SLSS does not conflict with the PSFCH, then in act 308, the wireless communication device may transmit the SLSS and the SFCI in the PSFCH.

[0066] In some embodiments of the present invention, the SLSS transmission configuration may include at least two signal quality thresholds (eg, RSRP thresholds), where each signal quality threshold may be applicable to a corresponding type of transmission (eg, multicast transmission or unicast transmission).

[0067] Figure 3B is a flowchart of a method of handling a conflict between a PSFCH and a SLSS according to an exemplary embodiment of the present disclosure.

[0068] In act 310, a wireless communication device (eg, UE) may receive a first signal quality threshold and a second signal quality threshold from a SLSS transmission configuration.

[0069] In act 312, when the wireless communication device is engaged in unicast operation, the wireless communication device may further determine whether to transmit the SLSS based on a first signal quality threshold.

[0070] In act 314, when the wireless communication device participates in a multicast operation, the wireless communication device may determine whether to transmit the SLSS based on a second signal quality threshold.

[0071] For example, when the RX UE participates in unicast operation, if the RSRP of the received SLSS is less than the first signal quality threshold, the RX UE may transmit the SLSS, and if the RSRP of the received SLSS is greater than or equal to the first signal quality threshold, the SLSS may not be transmitted. On the other hand, when the RX UE participates in multicast operation, if the RSRP of the received SLSS is less than the second signal quality threshold, the RX UE may transmit the SLSS, and if the RSRP of the received SLSS is greater than or equal to the second signal quality threshold, the SLSS may not be transmitted.

[0072] Figure 4 is a schematic diagram showing a collision between PSFCH and SLSS according to an exemplary embodiment of the present disclosure. Figure 4 As shown, the UE may receive data in PSSCH 402 and transmit corresponding HARQ feedback (SFCI) in PSFCH 404. The HARQ feedback may be ACK or NACK to indicate whether the data is successfully received in PSSCH 402. In this sense, PSFCH 404 may be considered to be associated with (or corresponding to) PSSCH 402.

[0073] In an exemplary embodiment, the opportunity 406 of the SLSS collides with the PSSCH 402 because at least a portion of the opportunity 406 overlaps in the time domain with the PSFCH 404. In this case, the UE may, for example, apply the method shown in FIG3 to handle the collision. For example, if the PSFCH 404 corresponds to a higher priority than the SLSS transmission in the opportunity 406, the UE may decide to transmit the HARQ feedback in the PSFCH 404 instead of performing the SLSS transmission in the opportunity 406.

[0074] In some embodiments of the present invention, when the timing of SLSS conflicts with PSFCH, the UE may default to not transmitting SLSS. In this case, PSFCH may correspond to a higher priority than SLSS transmission (eg, corresponding to a high-priority PSSCH).

[0075] In some embodiments of the present invention, the SLSS resources (or timing) of the first UE may conflict with the PSFCH of the second UE. In this case, the first UE may determine whether to perform SLSS based on the corresponding priorities of the SLSS resources and the PSFCH. For example, if the PSFCH of the second UE corresponds to a higher priority than the SLSS resources, the first UE may decide not to transmit SLSS when the conflict occurs. In some embodiments of the present invention, the first UE and the second UE may belong to the same group, and the first UE may know where the second UE may transmit SFCI.

[0076] In some embodiments of the present invention, when the timing of SLSS conflicts with PSFCH, the UE may default to not transmitting SFCI via PSFCH. In this case, PSFCH may correspond to a lower priority than SLSS transmission (eg, corresponding to a low-priority PSSCH).

[0077] In some embodiments of the present invention, when the timing of SLSS collides with PSFCH, whether to transmit SFCI in PSFCH may depend on the type of synchronization source configured to transmit SLSS. For example, if the synchronization source configured to transmit SLSS has a higher priority than the RX UE, the RX UE may decide to discard the SFCI transmission. The synchronization source may be, for example, a scheduler / header UE of the RX UE, or a base station.

[0078] In some embodiments of the present invention, the priority parameter can be provided by the scheduler / header UE, TX UE or base station in the group via DCI / SCI / MAC-CE (e.g., from PC5 or Uu) / RRC (e.g., from PC5 or Uu) / SIB (e.g., from PC5 or Uu) / MIB (e.g., from PC5 or Uu).

[0079] In some embodiments of the present invention, if the original resource of the SFCI conflicts with the timing of the SLSS, the UE may select another resource to transmit the SFCI. In some embodiments of the present invention, the original resource of the SFCI may be configured or indicated by the TX UE. In some other embodiments, the original resource of the SFCI may have a fixed time / frequency offset from the end of the corresponding PSSCH / PSCCH. The other resource that the UE selects to transmit the SFCI when a conflict occurs may have a time / frequency offset (e.g., X time slots, where X is a positive integer) from the original resource. The time / frequency offset may be pre-configured in the UE or dynamically configured by the network.

[0080] In some embodiments of the present invention, if the original resource of SFCI conflicts with the timing of SLSS, and SLSS transmission has a higher priority than SFCI transmission (for example, SLSS transmission is associated with (or performed by) a synchronization source), the UE may select another resource to transmit SFCI.

[0081] In some embodiments of the present invention, the UE capability-related indicator may be used to indicate whether the UE is capable of performing transmission and / or reception simultaneously in the same or different frequency carriers with the same or different parameter sets. If the UE is indicated as having the capability of simultaneously transmitting multiple signals (e.g., including SLSS and SFCI) through different channels with the same or different parameter sets in the frequency band, then when a conflict occurs, neither the SLSS transmission nor the SFCI transmission may be discarded.

[0082] In some embodiments of the present invention, the UE capability-related indicator may be used to indicate whether the UE is capable of performing transmission and / or reception on different SCSs, different resource pools, different BWPs, or different carriers simultaneously.

[0083] In some embodiments of the present invention, if the total TX power used for SLSS transmission and PSFCH transmission exceeds the power threshold, the UE may perform a power control process to adjust the TX power. In addition, the TX power of the reference signal associated with the PSFCH (e.g., Sounding Reference Signal (SRS) / CSI Reference Signal (CSI-Reference Signal: CSI-RS) / DMRS) may also be adjusted according to the TX power of the PSFCH.

[0084] In some embodiments of the present invention, the conflict control process of SLSS can also be applied to conflicts with other reference signals (e.g., Phase Tracking Reference Signal (PT-RS), SRS, CSI-RS, AGC symbols / signals, TX / RX switching symbols (protection symbols) and DM-RS).

[0085] In some embodiments of the present invention, since the SFCI is transmitted in a dedicated PSFCH, the PSFCH transmission may conflict with a PSSCH, a PSCCH, or another PSFCH on the same or different carrier / BWP / resource pool. In view of this, some embodiments of the present invention provide a method for handling a conflict between a first physical channel and a second physical channel. The first physical channel may be a PSFCH, and the second physical channel may be a PSSCH, a PSCCH, or another PSFCH. The first physical channel and the second physical channel may be associated with the same or different target devices. For example, a first PSFCH and a PSCCH / PSSCH / second PSFCH that conflict with each other may be configured to be transmitted to the same UE. For example, due to a fixed offset or delay requirement, there may be a HARQ feedback that is scheduled to use the same resources as the previous HARQ feedback.

[0086] Similar to the PSFCH-SLSS conflict situation, when two physical channels overlap each other by at least one OFDM symbol or at least one resource element, or when the UE cannot simultaneously apply different SCSs to the two physical channels, or when the UE cannot simultaneously transmit / receive two physical channels, the UE can determine that the first physical channel conflicts with the second physical channel.

[0087] When a conflict occurs, the UE may determine whether to transmit the first / second physical channel based on certain priority rules. The priority rules for the PSFCH-SLSS conflict situation described above also apply to conflicts between any two physical channels. For example, the UE may determine whether to transmit the first / second physical channel based on default settings (e.g., always discarding transmissions for the first or second physical channel), priority parameters, the type of target device, the capabilities of the UE, etc.

[0088] For example, if the PPPP value of the PSSCH / PSCCH is lower than a predefined / preconfigured / configured threshold (which means that the PSSCH / PSCCH has a higher transmission priority), the UE may discard the PSFCH transmission when the PSFCH collides with the PSSCH / PSCCH, but perform the PSSCH / PSCCH transmission. Conversely, if the PPPP value of the PSSCH / PSCCH transmission is higher than the threshold, the UE may decide to discard the PSSCH / PSCCH transmission and transmit the SFCI via the PSFCH.

[0089] In some embodiments of the present invention, if the PSSCH / PSCCH contains information / indicators related to the discovery process, the PSSCH / PSCCH may be considered a high priority transmission. For example, if the PSCCH contains a discovery indicator indicating that the associated PSSCH contains a discovery message, then when the PSSCH / PSCCH collides with the PSFCH, the UE may discard the PSFCH transmission but transmit the PSSCH / PSCCH.

[0090] In some embodiments of the present invention, if the target device of the PSFCH is a base station, the SFCI on the PSFCH may be given a high transmission priority. For example, when the first PSFCH conflicts with the PSSCH / PSCCH / second PSFCH transmission, if the first PSFCH contains HARQ feedback to the base station, the UE may not transmit the PSSCH / PSCCH / second PSFCH to the base station, but transmit the first PSFCH to the base station.

[0091] In some embodiments of the present invention, more than one SLSSID may be configured in the same base station. If some of the SFCI resource opportunities overlap with each other, the UE may decide which SFCI resources on the PSFCH to transmit based on the content in each SFCI resource. In some embodiments of the present invention, SFCI resources carrying HARQ feedback may be given a higher transmission priority. For example, if the UE needs to transmit HARQ feedback in a first PSFCH to a first target device, and also needs to transmit CSI information in a second PSFCH to a second target device, then if the first PSFCH conflicts with the second PSFCH, the UE may discard the second PSFCH transmission, but may only transmit the first PSFCH.

[0092] In some other embodiments, the SFCI resources carrying CSI information may be given a higher transmission priority. The CSI information may include at least one of the following: CSI-RS Resource Indicator (CSI-RS Resource Indicator: CRI), SLSS index, Layer Indicator (Layer Indicator: LI), Precoding Matrix Indicator (Precoding Matrix Indicator: PMI), Channel Quality Indicator (CQI), RSRP, Signal to Interference plus Noise Ratio (SINR), Rank Indicator (Rank Indicator: RI), and other information related to CSI.

[0093] Figure 5A5 is a schematic diagram showing UEs belonging to different groups according to an exemplary embodiment of the present disclosure. As shown in FIG. 5 , UE 502 belongs to both group 51 and group 53. In addition to UE 502, group 51 further includes UEs 504, 506, and 508, and group 53 further includes UEs 512 and 510. UEs in the same group may have the same group ID. For example, UE 504 may have the same group ID as UEs 506, 508, and 502 in the same group 51. In addition, the UE may transmit a signal / channel to other UEs in the same group by multicasting.

[0094] Figure 5B 1 is a flow chart of a method for a wireless communication device to perform SLSS transmission with different groups according to an exemplary embodiment of the present disclosure. In action 514, wireless communication devices (e.g., UEs) belonging to different groups at the same time may receive different SLSS transmission configurations from these groups. In action 516, the wireless communication device may perform SLSS transmission with the group based on the corresponding SLSS transmission configuration.

[0095] For example, in Figure 5A , UE 502 may receive a first SLSS transmission configuration from a first scheduler UE (e.g., UE 504) in group 51, and receive a second SLSS transmission configuration from a second scheduler UE (e.g., UE 510) in group 53. UE 502 may perform SLSS transmission with UEs 504, 506, and 508 in group 51 based on the first SLSS transmission configuration, and may perform SLSS transmission with UEs 510 and 512 in group 53 based on the second SLSS transmission configuration. In some embodiments of the present invention, the first SLSS transmission configuration and the second SLSS transmission configuration may differ from each other in at least one of, for example, TX power, time domain SLSS resource allocation, and frequency domain SLSS resource allocation. Therefore, UE 502 may apply different SLSS transmission schemes to communicate with UEs in the corresponding associated groups 51 and 53.

[0096] Figure 6 is a schematic diagram showing an example architecture of a base station according to an exemplary embodiment of the present disclosure. Figure 6As shown, the base station 600 may include a protocol stack that includes several protocol layers (e.g., an RRC layer 602, a MAC layer 604, and a physical (PHY) layer 606). The base station 600 may control and coordinate the activities of the various protocol layers of the protocol stack. In addition, the PHY layer 606 may be coupled to at least one Transmit / Receive Point (TRP) 608. The TRP 608 may be a combination of a macro cell, a small cell, a pico cell, a femto cell, a remote radio head (RRH), a relay node, or an antenna panel that may be deployed anywhere, such as inside a room, inside / on a building, on top of a house or street lamp, etc.

[0097] Figure 7 is a schematic diagram showing an example architecture of a UE according to an exemplary embodiment of the present disclosure. Figure 7 As shown, UE 700 may include a protocol stack including several protocol layers (e.g., RRC layer 702, MAC layer 704, and PHY layer 706). PHY layer 706 may be coupled to at least one transmit (TX) / receive (RX) antenna assembly 708 for transmitting and receiving signals. UE 700 may control and coordinate the activities of the various protocol layers of the protocol stack. For example, UE 700 may set and coordinate PHY layer 706, MAC layer 704, and RRC layer 702 based on signals received from TX / RX antenna assembly 708. UE 700 may also set one or more TX parameters for TX / RX antenna assembly 708 based on (one or more) input signals.

[0098] Figure 8 FIG. 1 is a schematic diagram showing a plurality of BWPs configured in different component carriers (CCs) according to an exemplary embodiment of the present disclosure. Figure 8 As shown, CC#1 804 includes BWP#1 806 , and CC#0 804 includes BWP#0 808 , which includes resource pool #0 810 and resource pool #1 812 .

[0099] For easier understanding, refer to Figure 1 The V2X wireless communication network 100 shown is Figure 8804. For example, UE 104, 106, 108, and 110 can perform transmission and reception in CC#0 804. BWP#0 808 is an operational / active BWP suitable for sidelink transmission and reception. Each UE can perform transmission or reception on BWP#0 808 based on scheduling information provided by other UEs (e.g., TX UE or scheduler / header UE) or base stations (e.g., base station 102). In addition, UE 104 and UE 106 belong to the same group, while UE 108 and UE 110 belong to another group. UE 106 can also perform transmission or establish a session on CC#1 804 and BWP#1 806.

[0100] In some implementations, UE 104 may act as a TX UE to instruct UE 106 (eg, RX UEs in the same group) to receive data on a corresponding PSSCH on resource pool #0 810 via PSCCH transmission scheduling information for groupcast.

[0101] Since UE 104 and UE 106 are in the same group, the CRC of the PSCCH for multicast may be used for scrambling the Radio Network Temporary Identifier (RNTI) for multicast. In some other embodiments, the CRC of the PSCCH for multicast may not be used for scrambling the RNTI for multicast, but the ID for multicast may be included in the SCI.

[0102] After UE 106 receives PSCCH from UE 104 and successfully decodes it, if the SLSS transmission indicator included in the SCI of the decoded PSCCH indicates a specific value (e.g., "0"), even if the RSRP value of the SLSS received by UE 106 from resource pool #0 810, BWP #0 808, or CC #0 804 is less than a threshold, UE 106 may decide not to perform SLSS transmission on resource pool #0 810, BWP #0 808, or CC #0 804. The threshold may be provided by base station 102 through broadcast system information.

[0103] In some embodiments of the present invention, the SLSS transmission indicator may be a threshold value of the RSRP value (or an index of a value range). For example, if the SLSS transmission indicator indicates an RSRP value of "-100 dBm", the UE 106 may perform SLSS transmission when the RSRP of the received SLSS is less than -100 dBm.

[0104] In some embodiments of the present invention, UE 106 may determine whether to perform SLSS transmission based on the difference between the area ID of UE 106 and the area ID of UE 104. If the area ID difference is greater than or equal to a threshold, UE 106 may decide not to perform SLSS transmission even if the RSRP of the SLSS measured by UE 106 is less than the threshold. The threshold may be provided by base station 102, for example, by broadcasting system information.

[0105] In some other implementations, even if the difference between the area IDs is less than the threshold, UE 106 may check the signal quality received from UE 104 (e.g., RSRP of the SLSS from UE 104). If the signal quality received from UE 104 is less than the threshold, UE 106 may still perform SLSS transmission.

[0106] In some embodiments of the present invention, UE 106 may perform unicast transmission with UE 108 on resource pool #1 812, and UE 104 may transmit a region ID or a SLSS transmission indicator to UE 106. After receiving the region ID or the SLSS transmission indicator from UE 104, UE 106 may decide not to perform SLSS transmission on resource pool #1 812 even if the signal quality of the SLSS measured on resource pool #1 812 is below a threshold.

[0107] In some embodiments of the present invention, UE 106 may perform unicast transmission with UE 108 on CC#1 804 or BWP#1 806. UE 104 may transmit a region ID or a SLSS transmission indicator to UE 106. If the region ID or the SLSS transmission indicator satisfies certain conditions (e.g., the difference between the region ID of UE 104 and the region ID of UE 106 is greater than a threshold), UE 106 may decide not to perform SLSS transmission on CC#1 804 or BWP#1 806 even if the signal quality of the SLSS on CC#1 804 or BWP#1 806 is less than a signal quality threshold.

[0108] In some embodiments of the present invention, UE 104 may act as a scheduler / header in the group due to the configuration of base station 102. In some other embodiments, UE 104 may inform base station 102 that UE 104 voluntarily becomes a scheduler / header UE in the group, and then base station 102 may configure UE 104 as a scheduler / header UE. Once UE 104 becomes a scheduler / header UE in the group, it may perform SLSS transmission on CC#0 804, BWP#0 808, or resource pool #0 810 even if the RSRP of the SLSS transmitted by UE 106 is higher than a threshold configured by base station 102 (e.g., via broadcast system information).

[0109] In some embodiments of the present invention, if UE 104 and UE 106 are respectively the scheduler / header UE and RX UE in the group, UE 106 may not perform SLSS transmission even if the RSRP of the SLSS measured by UE 106 is lower than a threshold configured by base station 102 (e.g., via broadcast system information).

[0110] In some embodiments of the present invention, UE 104 may transmit resource allocation for SLSS transmission to UE 106 via PSCCH to inform UE 106 of the resource location of SLSS transmission, thereby preventing UE 106 from performing SLSS transmission at the same resource location as UE 104. For example, UE 106 may perform SLSS transmission based on a first SLSS resource configuration and a second SLSS resource configuration of UE 104, wherein the first SLSS resource configuration and the second SLSS resource configuration may have different resource allocations for SLSS transmission. For example, UE 106 may perform SLSS transmission on resources indicated by the second SLSS resource configuration to avoid collision of SLSS transmissions.

[0111] In some embodiments, at least one timing offset indicator (e.g., similar to a syncOffsetIndicator IE) may be used to inform a UE (e.g., UE 106) of a timing offset between a first SLSS transmission (e.g., configured by a first SLSS transmission configuration) and a second SLSS transmission (e.g., configured by a second SLSS transmission configuration). The timing offset indicator may be transmitted, for example, via an SCI.

[0112] In some embodiments of the present invention, UE 104 may transmit a TX power configuration / indication of SLSS transmission to UE 106 via PSCCH to inform UE 106 of the TX power of SLSS transmission.

[0113] In some embodiments of the present invention, SLSS transmission information / resource allocation information / area ID may be transmitted from UE 104 to UE 106 via MAC-CE. The PSSCH transmitting the MAC-CE may be scheduled by the PSCCH for multicast.

[0114] In some embodiments of the present invention, SLSS transmission information / resource allocation information / area ID can be transmitted from UE 104 to UE 106 via RRC signaling via unicast / multicast / broadcast. The PSSCH for transmitting RRC signaling can be scheduled by the PSCCH for multicast. One or more IEs can be provided in the RRC signaling to indicate the SLSS transmission configuration / RSRP threshold / indicator to help UE 106 determine whether to perform SLSS transmission.

[0115] In some embodiments of the present invention, SLSS transmission information / resource allocation information / area ID may be transmitted from the base station 102 to the UE 106 via unicast / multicast / broadcast via RRC signaling / MAC-CE / DCI / system information. One or more IEs may be provided in the RRC signaling / MAC-CE / DCI / system information to indicate the SLSS transmission configuration / RSRP threshold / indicator to help the UE 106 determine whether to perform SLSS transmission.

[0116] In some embodiments of the present invention, UE 104 and UE 106 may perform unicast V2X communication.

[0117] In some embodiments of the present invention, assume that UE 104 is a scheduler UE of group #1 and UE 108 is a scheduler UE of group #2, and only scheduler UEs within the group can transmit (one or more) SLSS. In this case, if SLSSID #n to SLSSID #n+20 are reserved for scheduler UEs for multicast, UE 104 and UE 108 can select a SLSSID from the reserved (one or more) SLSSIDs to generate SLSS based on the IC / OOC indicator (e.g., included in the SL-MIB).

[0118] In some embodiments of the present invention, UE 104 may be a TX UE that transmits scheduling information to UE 106 (e.g., acting as an RX UE) via a PSCCH for multicast to instruct UE 106 to receive data on a corresponding PSSCH on resource pool #0810. Once UE 106 successfully receives data on the PSSCH, UE 106 may be instructed to transmit a corresponding SFCI (e.g., including at least one of HARQ feedback and CSI report) to UE 104 on resources in slot #n+4 (if the end of the PSSCH is in slot #n). If UE 106 is also configured / instructed to transmit (one or more) SLSS on the same slot #n+4 (e.g., based on RRC signaling from base station 102), the resources used for SFCI transmission may overlap with the resources used for SFCI transmission by at least one resource element. In this case, UE 106 may determine whether to perform SLSS transmission in slot #n+4 based on the above-mentioned priority rules. For example, the UE 106 may transmit SFCI in slot #n+4 without transmitting (one or more) SLSS. For example, the UE 106 may transmit (one or more) SLSS without transmitting SFCI in slot #n+4. For example, if the PPPP value of the PSSCH corresponding to the SFCI is below a threshold, the UE 106 may transmit SFCI in slot #n+4 and discard the SLSS transmission. The PPPP value may be included in the PSCCH that schedules the PSSCH.

[0119] In some embodiments of the present invention, if a NACK-only HARQ feedback mechanism is applied, if UE 106 successfully receives data on the PSSCH in time slot #n, UE 106 may not need to send HARQ feedback to UE 104. However, UE 106 may know that there are some other UEs in the same group, and those UEs may need to transmit HARQ feedback in time slot #n+4 to UE 104 (e.g., based on information from the scheduler / header UE or other UEs in the same group). Therefore, even if UE 106 is configured / instructed to transmit (one or more) SLSS in time slot #n+4, UE 106 may not perform SLSS transmission in time slot #n+4.

[0120] In some embodiments of the present invention, UE 106 may determine whether to perform SLSS transmission based on whether the PSSCH corresponding to the HARQ feedback (e.g., contained in the SFCI) is a high reliability transmission. For example, if UE 106 receives data on PSSCH in time slot #n, and the corresponding HARQ feedback is configured to be transmitted in time slot #n+4, then if PSSCH is a high reliability transmission, UE 106 may decide to transmit HARQ feedback in time slot #n+4 and discard SLSS transmission in the same time slot. In some embodiments of the present invention, PSSCH may be configured as a high reliability transmission because PSSCH is a repeated transmission, or PSSCH is scheduled by SCI or PSCCH transmitted in repeated resources, or PSSCH is scheduled by SCI with an aggregation level for high reliability, or PSSCH is scheduled by SCI with a reliability indicator / command.

[0121] In some embodiments of the present invention, UE 106 may decide whether to transmit SLSS based on the delay requirement indicator of PSSCH. For example, if UE 106 receives data on PSSCH in time slot #n, and the corresponding HARQ feedback is configured to be transmitted in time slot #n+4, then if the delay requirement indicator is less than a threshold, UE 106 may decide to transmit HARQ feedback in time slot #n+4, and discard SLSS transmission in the same time slot. In some embodiments of the present invention, the delay requirement indicator may be included in the PSCCH that schedules the PSSCH. The delay requirement indicator may be configured by UE 104 via PC5 RRC signaling or by base station 102 via Uu RRC signaling. For example, UE 106 may receive a PSSCH-latency budget-indicator (e.g., delay requirement indicator) from UE 104 via RRC signaling. UE 106 may compare the value of the PSSCH-delay budget-indicator with a predefined threshold to decide whether to discard the HARQ feedback transmission. In some embodiments of the present invention, if UE 106 is connected to more than one group, UE 106 may decide whether to perform SLSS transmission or SFCI transmission based on the delay requirement indicator configured for each group.

[0122] In some embodiments of the present invention, assuming that UE 106 knows that UE 108 is the scheduler UE of group #1 and UE 108 can perform SLSS transmission in time slot #n+4, if at least one resource element of the SFCI overlaps with the SLSS transmission of UE 108, UE 106 can decide not to perform SLSS transmission on the same time slot #n+4.

[0123] In some embodiments of the present invention, assuming that UE 106 knows that base station 102 can perform SLSS transmission in time slot #n+4, if at least one OFDM symbol overlaps with the SLSS transmission of base station 102, UE 106 can decide not to transmit SFCI in the same time slot #n+4.

[0124] In some embodiments of the present invention, assuming that UE 106 knows that UE 104 may perform SLSS transmission in time slot #n+4, UE 106 may decide not to transmit SFCI on the same time slot #n+4 if at least one OFDM symbol overlaps with the SLSS transmission of UE 104.

[0125] In some embodiments of the present invention, the timing offset between the PSSCH and the resource corresponding to the HARQ feedback may be K time slots, where K is a positive integer. In some embodiments of the present invention, the value K may be dynamically configured or indicated by the UE 104 via the SCI in the PSCCH.

[0126] In some embodiments of the present invention, if the original resources of the SFCI transmission overlap with the resources of the SLSS transmission, the UE 106 can transfer the resources of the SFCI transmission to another time slot (e.g., from time slot #n+4 to time slot #n+5).

[0127] As described above, in the group of the exemplary embodiment, UE 104 may be a TX UE and UE 106 may be a RX UE. UE 104 may transmit scheduling information via a PSCCH for multicast to instruct UE 106 to receive data on a corresponding PSSCH on resource pool #0 810. Once UE 106 successfully receives data on the PSSCH, UE 106 may transmit a corresponding SFCI (e.g., including HARQ feedback) to UE 104 via a PSFCH. The resources of the PSFCH may be four slots (e.g., in slot #n+4) following the PSSCH (e.g., in slot #n). In this case, if the UE 106 is also configured / instructed to transmit another PSSCH in time slot #n+4 for another session link in CC#1 804, and the resources of the PSFCH overlap with the resources of another PSSCH by at least one OFDM symbol, the UE 106 may determine whether to perform PSSCH / PSCCH transmission in CC#1 804 based on default settings, pre-configured / configured priority parameters, UE capabilities, etc. For example, the UE 106 may decide not to transmit PSSCH / PSCCH in CC#1 804, but to transmit PSFCH with SFCI to the UE 104. In an alternative example, the UE 106 may decide not to transmit PSFCH with SFCI to the UE 104, but to transmit PSSCH / PSCCH in CC#1 802.

[0128] In some embodiments of the present invention, UE 106 may receive data on PSSCH #1 from UE 104 in slot #n and expect to transmit the corresponding SFCI via PSFCH #1 in slot #n + 4. In this case, if UE 106 also receives aperiodic PSSCH #2 in slot #n + 2 from UE 104 in CC #0 804 and expects to transmit the corresponding SFCI for aperiodic PSSCH #2 in the same slot #n + 4 on CC #0 804, UE 106 may decide to forgo the SFCI transmission of PSFCH #1 because PSFCH #2 corresponds to the aperiodic transmission scheme.

[0129] In some embodiments of the present invention, UE 106 may receive a discovery signal from another UE via PSSCH #3 in CC #1 802, and desires to transmit corresponding feedback for the discovery signal in slot #n+4 in CC #1 802. In this case, UE 106 may decide to forgo PSFCH transmission to UE 106 because the PSFCH transmission overlaps with the feedback transmission associated with the discovery process in another CC (CC #1 802).

[0130] In some embodiments of the present invention, UE 106 may transmit a UE capability message to inform UE 104 whether UE 106 has the capability to simultaneously transmit / receive signals / channels on different resource pools / BWPs / carriers, and / or the capability to simultaneously transmit / receive signals / channels with different parameter sets. If the UE capability message indicates that UE 106 has the capability to perform simultaneous transmission / reception, UE 106 may first allocate TX power for PSFCH transmission to UE 104, and then allocate the remaining TX power for other PSSCH transmissions to other UEs in other sessions / links.

[0131] Fig. 9 is a block diagram illustrating a node for wireless communication according to various aspects of the present disclosure. Fig. 9 As shown, the node 900 may include a transceiver 920, a processor 928, a memory 934, one or more display components 938, and at least one antenna 936. The node 900 may also include an RF band module, a BS communication module, a network communication module, and a system communication management module, an input / output (I / O) port, an I / O component, and a power supply (not shown). Fig. 9 ). Each of the components may communicate with each other directly or indirectly via one or more buses 940. In one embodiment, the node 900 may be a processor that executes the method described herein, for example, as referenced in Figures 1 to 8 The various functions of a UE or BS are described.

[0132] The transceiver 920 has a transmitter 922 (e.g., a transmitting / transmission circuit) and a receiver 924 (e.g., a receiving / reception circuit), and the transceiver 920 can be configured to transmit and / or receive time and / or frequency resource partitioning information. In some embodiments, the transceiver 920 can be configured to transmit in different types of subframes and time slots, including but not limited to available, unavailable, and flexibly usable subframe and time slot formats. The transceiver 920 can be configured to receive data and control channels.

[0133] Node 900 may include a variety of computer-readable media. Computer-readable media may be any available media that can be accessed by node 900, and computer-readable media may include both volatile (and non-volatile) media and removable (and non-removable) media. As non-limiting examples, computer-readable media may include computer storage media and communication media. Computer storage media may include volatile (and / or non-volatile) and removable (and / or non-removable) media implemented by any method or technology for storing information such as computer-readable instructions, data structures, program modules, or data.

[0134] Computer storage media may include RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, Digital Versatile Disk (DVD) or other optical disk storage, cassettes, magnetic tape, disk storage or other magnetic storage devices. Computer storage media do not contain propagated data signals. Communication media can generally be embodied as computer-readable instructions, data structures, program modules or other data in a modulated data signal (such as a carrier wave or other transmission mechanism), and include any information delivery media. The term "modulated data signal" may mean that one or more characteristics of this signal are set or changed to encode data into this signal. As non-limiting examples, communication media may include wired media (such as a wired network or a direct wired connection) and wireless media (such as acoustic, RF, infrared and other wireless media). Any combination of the above should also be included in the scope of computer-readable media.

[0135] The memory 934 may include computer storage media in the form of volatile and / or non-volatile memory. The memory 934 may be removable, non-removable, or a combination thereof. Exemplary memory may include solid-state memory, a hard disk, an optical drive, etc. As shown in FIG. 9 , the memory 934 may store computer-readable computer-executable instructions 932 (e.g., software code) that, when executed, are configured to cause the processor 928 to perform various functions described herein, such as: Figures 1 to 8 Alternatively, instructions 932 may not be directly executable by processor 928, but may be configured to cause node 900 (eg, when programmed and executed) to perform various functions described herein.

[0136] The processor 928 (e.g., having a processing circuit) may include an intelligent hardware device, such as a central processing unit (CPU), a microcontroller, an ASIC, etc. The processor 928 may include a memory. The processor 928 may process data 930 and instructions 932 received from the memory 934, and information transmitted through the transceiver 920, the baseband communication module, and / or the network communication module. The processor 928 may also process information to be transmitted to the transceiver 920 for transmission through the antenna 936 and to be transmitted to the network communication module for transmission to the core network.

[0137] One or more presentation components 938 can present data indications to a person or other device. Exemplary one or more presentation components 938 can include a display device, a speaker, a printing component, a vibration component, etc.

[0138] According to the above description, a variety of techniques may be used to implement the concepts described in this application without departing from the scope of these concepts. In addition, although these concepts have been described with specific reference to certain embodiments, those with ordinary knowledge in the art will recognize that changes may be made in form and detail without departing from the scope of these concepts. As such, the embodiments described will be considered illustrative and not restrictive in all respects. Furthermore, it should be understood that the present application is not limited to the specific embodiments described above, and that it is possible to rearrange, modify, and replace these embodiments in many ways without departing from the scope of this disclosure.

Claims

1. A wireless communication device, comprising: Transceiver; one or more non-transitory computer-readable media having computer-executable instructions embodied thereon; as well as at least one processor coupled to the transceiver and the one or more non-transitory computer-readable media and configured to execute the computer-executable instructions, the computer-executable instructions causing the wireless communication device to: receiving, by the transceiver, first sidelink control information SCI associated with a first physical sidelink shared channel PSSCH, the first SCI comprising a first priority value of the first PSSCH, the first PSSCH corresponding to a physical sidelink feedback channel PSFCH carrying sidelink feedback control information SFCI, the first priority value being applicable to the PSFCH; receiving, by the transceiver, a second SCI associated with a second PSSCH, the second SCI comprising a second priority value of the second PSSCH, When the timing of the PSFCH conflicts with the timing of the second PSSCH, determining whether to send the PSFCH according to a comparison result of the first priority value and the second priority value; as well as In response to the first priority value being higher than the second priority value, the PSFCH is transmitted by the transceiver.

2. The wireless communication device according to claim 1, wherein: The first SCI is carried by one of the first PSSCH and a first physical sidelink control channel PSCCH, and the second SCI is carried by one of the second PSSCH and a second PSCCH.

3. The wireless communication device according to claim 1, wherein: When the PSFCH receiving device is a base station, the computer executable instructions further cause the wireless communication device to: When the PSFCH collides with any other physical channel, the PSFCH is transmitted to the base station by the transceiver.

4. The wireless communication device according to claim 1, wherein: The wireless communication device is a scheduler source device.

5. The wireless communication device according to claim 1, wherein: When the timing of the PSFCH overlaps with the timing of the second PSSCH in at least one orthogonal frequency division multiplexing (OFDM) symbol in the time domain, the timing of the PSFCH is determined to conflict with the timing of the second PSSCH.

6. The wireless communication device according to claim 1, wherein: When the timing of the PSFCH collides with the timing of the second PSSCH in at least one resource element, the timing of the PSFCH is determined to collide with the timing of the second PSSCH.

7. The wireless communication device according to claim 1, wherein: When the PSFCH and the second PSSCH are configured to be simultaneously transmitted through a plurality of spatial filters, a timing of the PSFCH is determined to collide with a timing of the second PSSCH.

8. The wireless communication device according to claim 1, wherein: The timing of the PSFCH and the timing of the second PSSCH are respectively configured as one of the following: Different bandwidth parts BWP; Different resource pools; and Different carriers.

9. A method performed by a wireless communication device, the method comprising: receiving first sidelink control information SCI associated with a first physical sidelink shared channel PSSCH, the first SCI comprising a first priority value of the first PSSCH, the first PSSCH corresponding to a physical sidelink feedback channel PSFCH carrying sidelink feedback control information SFCI, the first priority value being applicable to the PSFCH; receiving a second SCI associated with a second PSSCH, the second SCI comprising a second priority value for the second PSSCH, When the timing of the PSFCH conflicts with the timing of the second PSSCH, determining whether to send the PSFCH according to a comparison result of the first priority value and the second priority value; as well as According to a situation where the first priority value is higher than the second priority value, the PSFCH is sent.

10. The method according to claim 9, wherein: The first SCI is carried by one of the first PSSCH and a first physical sidelink control channel PSCCH, and the second SCI is carried by one of the second PSSCH and a second PSCCH.

11. The method according to claim 9, wherein: When the PSFCH receiving device is a base station, the method further includes: When the PSFCH collides with any other physical channel, the PSFCH is sent to the base station.

12. The method according to claim 9, wherein: The wireless communication device is a scheduler source device.

13. The method according to claim 9, wherein: When the timing of the PSFCH overlaps with the timing of the second PSSCH in at least one orthogonal frequency division multiplexing (OFDM) symbol in the time domain, the timing of the PSFCH is determined to conflict with the timing of the second PSSCH.

14. The method according to claim 9, wherein: When the timing of the PSFCH collides with the timing of the second PSSCH in at least one resource element, the timing of the PSFCH is determined to collide with the timing of the second PSSCH.

15. The method according to claim 9, wherein: When the PSFCH and the second PSSCH are configured to be simultaneously transmitted through a plurality of spatial filters, a timing of the PSFCH is determined to collide with a timing of the second PSSCH.

16. The method according to claim 9, wherein: The timing of the PSFCH and the timing of the second PSSCH are respectively configured as one of the following: Different bandwidth parts BWP; Different resource pools; and Different carriers.

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