Power saving enhancements for sidelink

Abstract

Systems, methods, and devices are provided for mobile communications including sidelink transmissions. A user equipment (UE) determines first radio resources for one or more first sidelink transport blocks based on a partial sensing resource allocation procedure associated with a first window size. The UE transmits the one or more first sidelink transport blocks based on the first radio resources. The UE receives hybrid automatic repeat request (HARQ) feedback based on a first number of negative acknowledgements (NACKs) and a second number of positive acknowledgements (ACKs). Based on an application of a threshold, the UE determines second radio resources for one or more second sidelink transport blocks. The UE transmits the one or more second sidelink transport blocks based on the second radio resources.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to methods for sidelink resource selection. BACKGROUND

[0002] Generally, information can be exchanged with computing devices and communication networks. In typical applications, a computing device can request / transmit data with another computing device via a communication network. More specifically, a computing device can utilize a wireless communication network to exchange information or establish a communication channel.

[0003] A wireless communication network can include a variety of devices that include or access components to access the wireless communication network. Such devices can utilize the wireless communication network to facilitate interaction with other devices that have access to the wireless communication network, or through the wireless communication network to facilitate interaction with devices that utilize other communication networks. SUMMARY

[0004] In some embodiments of the present disclosure, a method for sidelink resource selection is provided. The method includes determining, by a first user equipment (UE), first radio resources for one or more first sidelink transport blocks based on a first sidelink resource allocation procedure; transmitting, by the first UE to a second UE, the one or more first sidelink transport blocks based on the first radio resources; receiving, by the first UE, first hybrid automatic repeat request (HARQ) feedback for the one or more first sidelink transport blocks; determining, by the first UE based on the HARQ feedback, whether to switch from the first sidelink resource allocation procedure to a second sidelink resource allocation procedure; in response to determining to switch to the second sidelink resource allocation procedure, determining, by the first UE based on the second sidelink resource allocation procedure, second radio resources for one or more second sidelink transport blocks; and transmitting, by the first UE to the second UE, the one or more second sidelink transport blocks based on the second radio resources.

[0005] In some embodiments of the disclosure, a method for sidelink resource selection is provided. The method includes determining, by a first user equipment (UE), first radio resources for one or more first sidelink transport blocks based on a partial sensing resource allocation procedure associated with a first window size; transmitting, by the first UE to a second UE, the one or more first sidelink transport blocks based on the first radio resources; receiving, by the first UE, hybrid automatic repeat request (HARQ) feedback for the one or more first sidelink transport blocks, wherein the HARQ feedback includes a first number of negative acknowledgements (NACKs) and a second number of positive acknowledgements (ACKs); determining, by the first UE, a NACK ratio of the first number of NACKs to a sum of the first number of NACKs and the second number of ACKs; determining, by the first UE, second radio resources for one or more second sidelink transport blocks based on a partial sensing resource allocation procedure associated with a second window size, wherein the second window size is greater than, less than, or equal to the first window size based on comparing the NACK ratio to one or more thresholds; and transmitting, by the first UE, the one or more second sidelink transport blocks based on the second radio resources.

[0006] In some embodiments of the disclosure, a first UE for a mobile communication network including sidelink transmissions is provided. The first UE includes a memory storing instructions; and a processor configured to execute the instructions to: determine first radio resources for one or more first sidelink transport blocks based on a first sidelink resource allocation procedure; transmit, to a second UE, the one or more first sidelink transport blocks based on the first radio resources; receive first hybrid automatic repeat request (HARQ) feedback for the one or more first sidelink transport blocks; determine whether to switch from the first sidelink resource allocation procedure to a second sidelink resource allocation procedure based on the HARQ feedback; in response to determining to switch to the second sidelink resource allocation procedure, determine second radio resources for one or more second sidelink transport blocks based on the second sidelink resource allocation procedure; and transmit, to the second UE, the one or more second sidelink transport blocks based on the second radio resources.

[0007] In some embodiments of this disclosure, a second user equipment (UE) is provided for a mobile communication network including sidelink transmissions. The second UE includes a memory storing instructions; and a processor configured to execute instructions to: receive from a first UE one or more first sidelink transport blocks determined by the first UE based on a first sidelink resource allocation procedure; transmit to the first UE a first Hybrid Automatic Repeat Request (HARQ) feedback for the one or more first sidelink transport blocks; and, in response to the first UE determining a switch to a second sidelink resource allocation procedure, receive from the first UE one or more second sidelink transport blocks determined by the first UE based on a second sidelink resource allocation procedure.

[0008] In some embodiments of this disclosure, a system for mobile communication including sidelink transmission is provided. A first user equipment (UE) is configured to determine, based on a first sidelink resource allocation procedure, a first radio resource for one or more first sidelink transport blocks, and to transmit the one or more first sidelink transport blocks based on the first radio resource; and a second UE is configured to receive the one or more first sidelink transport blocks and to transmit a first Hybrid Automatic Repeat Request (HARQ) feedback for the one or more first sidelink transport blocks to the first UE. The first UE is further configured to: determine, based on the HARQ feedback, whether to switch from a first sidelink resource allocation procedure to a second sidelink resource allocation procedure; in response to determining the switch to the second sidelink resource allocation procedure, determine, based on the second sidelink resource allocation procedure, a second radio resource for one or more second sidelink transport blocks; and to transmit the one or more second sidelink transport blocks to the second UE based on the second radio resource. In some embodiments of this disclosure, the system may further include a base station, and the second UE may be configured to transmit HARQ feedback to the first UE via the base station.

[0009] In some embodiments of this disclosure, a non-transitory computer-readable medium is provided. This non-transitory computer-readable medium stores a set of instructions executable by at least one processor of a first user equipment (UE) in a mobile communication system including sidelink transmissions to perform a method. The method includes: determining, based on a first sidelink resource allocation procedure, a first radio resource for one or more first sidelink transmission blocks; transmitting the one or more first sidelink transmission blocks to a second UE based on the first radio resource; receiving first Hybrid Automatic Repeat Request (HARQ) feedback for the one or more first sidelink transmission blocks; determining, based on the HARQ feedback, whether to switch from the first sidelink resource allocation procedure to a second sidelink resource allocation procedure; in response to determining to switch to the second sidelink resource allocation procedure, determining, based on the second sidelink resource allocation procedure, a second radio resource for one or more second sidelink transmission blocks; and transmitting the one or more second sidelink transmission blocks to the second UE based on the second radio resource.

[0010] In some embodiments of this disclosure, a non-transitory computer-readable medium is provided. This non-transitory computer-readable medium stores a set of instructions executable by at least one processor of a second user equipment (UE) in a mobile communication system including sidelink transmissions to perform a method. The method includes: receiving from a first UE one or more first sidelink transmission blocks determined by the first UE based on a first sidelink resource allocation procedure; transmitting to the first UE a first Hybrid Automatic Repeat Request (HARQ) feedback for the one or more first sidelink transmission blocks; and receiving from the first UE one or more second sidelink transmission blocks determined by the first UE based on a second sidelink resource allocation procedure in response to the first UE determining a switch to a second sidelink resource allocation procedure. Attached Figure Description

[0011] [ Figure 1 ] Figure 1 Examples of mobile communication systems are shown, illustrating some aspects of one or more exemplary embodiments according to this disclosure.

[0012] [Figure 2] Figure 2A and Figure 2B Examples of radio protocol stacks for the user plane and control plane, respectively, are shown according to one or more exemplary embodiments of this disclosure.

[0013] [Figure 3] Figure 3A , Figure 3B and Figure 3C Exemplary mappings between logical channels and transport channels in downlink, uplink, and sidelink according to one or more exemplary embodiments of this disclosure are shown respectively.

[0014] [Figure 4] Figure 4A , Figure 4B and Figure 4C Exemplary mappings between transport channels and physical channels in downlink, uplink, and sidelink according to one or more exemplary embodiments of this disclosure are shown respectively.

[0015] [Figure 5] Figure 5A , Figure 5B , Figure 5C and Figure 5D Examples of radio protocol stacks for NR-side link communication are shown, representing some aspects of one or more exemplary embodiments of this disclosure.

[0016] [ Figure 6 ] Figure 6 Example physical signals in the downlink, uplink, and sidelink of some aspects according to one or more exemplary embodiments of this disclosure are shown.

[0017] [ Figure 7 ] Figure 7 Examples of Radio Resource Control (RRC) states and transitions between different RRC states are shown, representing some aspects of one or more exemplary embodiments of this disclosure.

[0018] [ Figure 8 ] Figure 8 Example frame structures and physical resources are shown, representing some aspects of one or more exemplary embodiments according to this disclosure.

[0019] [ Figure 9 ] Figure 9 Exemplary member carrier configurations in different carrier aggregation scenarios are shown in accordance with one or more exemplary embodiments of this disclosure.

[0020] [ Figure 10 ] Figure 10 Example portions of bandwidth configuration and switching are shown, representing some aspects of one or more exemplary embodiments according to this disclosure.

[0021] [ Figure 11 ] Figure 11 Example four-step contention-based random access procedures and contention-free random access procedures are shown, illustrating some aspects of one or more exemplary embodiments of this disclosure.

[0022] [ Figure 12 ] Figure 12 Examples of two-step contention-based random access procedures and contention-free random access procedures are shown, illustrating some aspects of one or more exemplary embodiments of the present disclosure.

[0023] [ Figure 13 ] Figure 13 Example time and frequency structures of a Synchronization Signal and PBCH Block (SSB) are shown, representing some aspects of one or more exemplary embodiments of the present disclosure.

[0024] [ Figure 14 ] Figure 14 Example SSB burst transmissions are shown, illustrating some aspects of one or more exemplary embodiments according to this disclosure.

[0025] [ Figure 15 ] Figure 15 Example components of user equipment and base stations for transmission and / or reception are shown, representing some aspects of one or more exemplary embodiments of this disclosure.

[0026] [ Figure 16 ] Figure 16 This illustrates an example side-by-side traverse resource selection process that utilizes some aspects of one or more exemplary embodiments of the present disclosure.

[0027] [ Figure 17 ] Figure 17 This illustrates an example side-by-side link resource selection process that utilizes some aspects of some embodiments of various one or more exemplary embodiments according to this disclosure.

[0028] [ Figure 18 ] Figure 18 Example processes are shown that illustrate some aspects of one or more exemplary embodiments according to this disclosure.

[0029] [ Figure 19 ] Figure 19 Example processes are shown that illustrate some aspects of one or more exemplary embodiments according to this disclosure.

[0030] [ Figure 20 ] Figure 20 Example processes are shown that illustrate some aspects of one or more exemplary embodiments according to this disclosure.

[0031] [ Figure 21 ] Figure 21 Example processes are shown that illustrate some aspects of one or more exemplary embodiments according to this disclosure. Detailed Implementation

[0032] The following disclosure provides numerous different embodiments or examples for implementing various features of the provided subject matter. Specific examples of arrangements are described below to simplify this disclosure. These are merely examples and are not intended to be limiting.

[0033] While the terms "first," "second," etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used to distinguish one element from another. For example, without departing from the scope of the embodiments, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0034] Figure 1 Examples of mobile communication systems 100 according to one or more exemplary embodiments of the present disclosure are shown. The mobile communication system 100 may be operated by a wireless communication system operator such as a Mobile Network Operator (MNO), a Private Network Operator (DMO), a Multiple System Operator (MSO), or an Internet of Things (IoT) network operator, and may provide services such as voice, data (e.g., wireless Internet access), messaging, vehicle communication services such as Vehicle to Everything (V2X) communication services, security services, mission-critical services, and services in residential, commercial, or industrial environments such as IoT and Industrial IoT (IIOT).

[0035] Mobile communication system 100 can support various types of applications with different requirements in terms of latency, reliability, and throughput. Examples of supported applications include enhanced mobile broadband (eMBB), ultra-reliable low-latency communication (URLLC), and massive machine-type communication (mMTC). eMBB can support stable connections with high peak data rates as well as medium rates for cell-edge users. URLLC can support applications with stringent requirements for latency and reliability and medium requirements for data rates. Example mMTC applications include networks of numerous IoT devices that are only occasionally active and send small data payloads.

[0036] The mobile communication system 100 may include a radio access network (RAN) portion and a core network portion. Figure 1 The examples shown illustrate a Next-Generation RAN (NG-RAN) 105 and a 5G Core Network (5GC) 110 as examples of RAN and core network, respectively. Other examples of RAN and core network may be implemented without departing from the scope of this disclosure. Other examples of RAN include Evolved Universal Terrestrial Radio Access Network (EUTRAN), Universal Terrestrial Radio Access Network (UTRAN), etc. Other examples of core network include Evolved Packet Core (EPC), UMTS Core Network (UCN), etc. The RAN implements Radio Access Technology (RAT) and resides between User Equipment (UE) 125 (e.g., UE 125A to UE 125E) and the core network. Examples of such RATs include New Radio (NR), Long Term Evolution (LTE) (also known as Evolved Universal Terrestrial Radio Access (EUTRA)), and Universal Mobile Telecommunication System (UMTS). The RAT of the example mobile communication system 100 could be NR. The core network resides between the RAN and one or more external networks (e.g., data networks) and is responsible for functions such as mobility management, authentication, session management, establishing bearers and applications with different Quality of Service (QoS) levels. The functional layer between UE 125 and the RAN (e.g., NG-RAN 105) can be referred to as the Access Stratum (AS), and the functional layer between UE 125 and the core network (e.g., 5GC 110) can be referred to as the Non-access Stratum (NAS).

[0037] UE 125 may include wireless transmission and reception components for communicating with one or more nodes, one or more relay nodes, or one or more other UEs in the RAN. Examples of UE 125 include, but are not limited to, smartphones, tablets, laptops, computers, wireless transmission and / or reception units in vehicles, V2X or vehicle-to-vehicle (V2V) devices, wireless sensors, IoT devices, IIoT devices, etc. Other names may be used for UE 125, such as Mobile Station (MS), Terminal Equipment, Terminal Node, Client Equipment, Mobile Equipment, etc. Furthermore, UE 125 may also include components or sub-components integrated into other devices such as vehicles to provide wireless communication capabilities with nodes, other UEs, and satellites in the RAN as described herein. In addition to wireless communication, such other devices may also have other functions or multiple functions. Accordingly, references to UE may include individual components that facilitate wireless communication as well as the entire device containing the components for facilitating wireless communication.

[0038] The RAN may include nodes (e.g., base stations) for communicating with the UE. For example, the NG-RAN 105 of mobile communication system 100 may include nodes for communicating with the UE 125. Depending on the RAT used by the RAN, different names may be used for the RAN nodes. In a RAN using the UMTS RAT, the RAN node may be referred to as Node B (NB). In a RAN using the LTE / EUTRA RAT, the RAN node may be referred to as an evolved Node B (eNB). Figure 1In the illustrative example of the mobile communication system 100, the nodes of NG-RAN 105 can be next-generation node B (gNB) 115 (e.g., gNB 115A, gNB 115B) or next-generation evolved node B (ng-eNB) 120 (e.g., ng-eNB 120A, ng-eNB 120B). In this specification, the terms base station, RAN node, gNB, and ng-eNB are used interchangeably. gNB 115 can provide NR user plane and control plane protocol terminals to UE 125. NG-eNB 120 can provide E-UTRA user plane and control plane protocol terminals to UE 125. The interface between gNB 115 and UE 125 or between ng-eNB 120 and UE 125 can be referred to as the Uu interface. The Uu interface can be established together with the user plane protocol stack and the control plane protocol stack. For the Uu interface, the direction from the base station (e.g., gNB 115 or ng-eNB 120) to the UE 125 can be referred to as the downlink, and the direction from the UE 125 to the base station (e.g., gNB 115 or ng-eNB 120) can be referred to as the uplink.

[0039] gNB 115 and ng-eNB 120 can interconnect via the Xn interface. The Xn interface can include an Xn user plane (Xn-U) interface and an Xn control plane (Xn-C) interface. The transport network layer of the Xn-U interface can be built on Internet Protocol (IP) transport and can use the General Packet Radio Service (GPRS) Tunneling Protocol (GTP) over User Datagram Protocol (UDP) / IP to carry User Plane Protocol Data Units (PDUs). Xn-U can provide non-guaranteed delivery of User Plane PDUs and can support data forwarding and flow control. The transport network layer of the Xn-C interface can be built on the Stream Control Transport Protocol (SCTP) over IP. The application layer signaling protocol can be referred to as XnAP (Xn Application Protocol). The SCTP layer can provide guaranteed delivery of application layer messages. In the transport IP layer, point-to-point transmission can be used to deliver signaling PDUs. The Xn-C interface can support Xn interface management, UE mobility management including context transmission and RAN paging, and dual connectivity.

[0040] The gNB 115 and ng-eNB 120 can also connect to the 5GC 110 via the NG interface. More specifically, they connect to the Access and Mobility Management Function (AMF) 130 (e.g., AMF 130A, AMF 130B) of the 5GC 110 via the NG-C interface, and to the User Plane Function (UPF) 135 (e.g., UPF 135A, UPF 135B) of the 5GC 110 via the NG-U interface. The transport network layer of the NG-U interface can be built on IP transport and can use the GTP protocol over UDP / IP to carry user plane PDUs between the NG-RAN node (e.g., gNB115 or ng-eNB 120) and the UPF 135. NG-U can provide non-guaranteed delivery of user plane PDUs between the NG-RAN node and the UPF. The transport network layer of the NG-C interface can be built on IP transport. To ensure reliable transmission of signaling messages, SCTP can be added on top of IP. The application layer signaling protocol can be called NGAP (NG Application Protocol). The SCTP layer provides guaranteed delivery of application layer messages. During transmission, IP layer point-to-point transmission can be used to deliver signaling PDUs. The NG-C interface can provide the following functions: NG interface management; UE context management; UE mobility management; NAS message transmission; paging; PDU session management; configuration delivery; and warning message transmission.

[0041] The gNB 115 or ng-eNB 120 can host one or more of the following functions: radio resource management functions, such as radio bearer control, radio admission control, connection mobility control, dynamic allocation of resources to the UE in the uplink and downlink (e.g., scheduling); IP and Ethernet header compression, encryption, and integrity protection of data; selection of the AMF at the UE's attachment device when it can be determined from information provided by the UE that there is no route to the AMF; routing user plane data to one or more UPFs; routing control plane information to the AMF; connection establishment and release; scheduling and transmission of paging messages; scheduling and transmission of system broadcast information (e.g., originating from the AMF); mobility and scheduling measurement and measurement report configuration; transport layer packet marking in the uplink; session management; network slicing support; QoS flow management and mapping to data radio bearers; support for UEs in RRC inactive state; NAS message distribution function; radio access network sharing; dual connectivity; tight interoperability between NR and E-UTRA; and maintaining the 5G system for user plane (5G System, 5GS) Cellular IoT (CIoT) optimized security and radio configuration.

[0042] The AMF 130 can host one or more of the following functions: NAS signaling termination; NAS signaling security; AS security control; CN inter-node signaling for mobility between 3GPP access networks; idle mode UE reachability (including control and execution of paging retransmission); registration area management; support for intra-system and inter-system mobility; access authentication; access authorization including checking roaming rights; mobility management control (subscription and policy); network slicing support; Session Management Function (SMF) selection; and selection of 5GS CIoT optimization.

[0043] UPF 135 can host one or more of the following functions: anchor points for intra / inter-RAT mobility (where applicable); external PDU session points for interconnection with data networks; packet routing and forwarding; user plane portion of packet inspection and policy rule enforcement; traffic usage reporting; uplink classifiers to support routing traffic flows to data networks; branch points to support multihomed PDU sessions; QoS processing for user plane, such as packet filtering, gating, UL / DL rate enforcement; uplink traffic authentication (Service Data Flow (SDF) to QoS flow mapping); downlink packet buffering and downlink data notification triggering.

[0044] like Figure 1As shown, NG-RAN 105 can support a PC5 interface between two UEs 125 (e.g., UE 125A and UE 125B). In the PC5 interface, the communication direction between the two UEs (e.g., from UE 125A to UE 125B or vice versa) can be referred to as a sidelink. Sidelink transmission and reception via the PC5 interface can be supported when UE 125 is within the NG-RAN 105 coverage area, regardless of its RRC state, and also when UE 125 is outside the NG-RAN 105 coverage area. Support for V2X services via the PC5 interface can be provided by NR sidelink communication and / or V2X sidelink communication.

[0045] PC5-S signaling can be used for unicast link establishment with direct communication request / accept messages. The UE can, for example, self-assign its source stratum 2 ID for the PC5 unicast link based on the V2X service type. During the unicast link establishment process, the UE can send its source stratum 2 ID for the PC5 unicast link to a peer UE (e.g., a UE that has already received the destination ID from the upper layer). A pair of source stratum 2 IDs and destination stratum 2 IDs can uniquely identify the unicast link. The receiving UE can verify that the destination ID belongs to it and can accept the unicast link establishment request from the source UE. During the PC5 unicast link establishment process, the PC5-RRC procedure on the access layer can be invoked for UE-sidelink context establishment and AS layer configuration, capability exchange, etc. PC5-RRC signaling enables the exchange of UE capabilities and AS layer configurations, such as sidelink radio bearer configuration, between a pair of UEs that have established a PC5 unicast link.

[0046] NR sidelink communication can support one of three transmission modes (e.g., unicast, multicast, and broadcast) for a pair of source layer 2IDs and destination layer 2IDs in the AS. Unicast transmission mode is characterized by: support for a PC5-RRC connection between the peer UEs in the pair; transmission and reception of control information and user traffic between peer UEs in the sidelink; support for sidelink HARQ feedback; support for sidelink transmission power control; support for RLC Acknowledged Mode (AM); and detection of radio link failures in the PC5-RRC connection. Multicast transmission is characterized by: transmission and reception of user traffic between a group of UEs in the sidelink; and support for sidelink HARQ feedback. Broadcast transmission is characterized by: transmission and reception of user traffic between UEs in the sidelink.

[0047] Source Layer 2 ID, Destination Layer 2 ID, and PC5 Link Identifier can be used in NR side-link communication. The Source Layer 2 ID identifies the sender of data in NR side-link communication. The Source Layer 2 ID can be a link layer identifier identifying the device or group of devices that is the receiver of the side-link communication frame. The Destination Layer 2 ID can be a link layer identifier identifying the device that initiated the side-link communication frame. In some examples, the Source Layer 2 ID and Destination Layer 2 ID can be assigned by management functions in the core network. The Source Layer 2 ID can be 24 bits long and can be split into two bit strings at the Medium Access Control (MAC) layer: one bit string can be the LSB portion (8 bits) of the Source Layer 2 ID and is forwarded to the sender's physical layer. This can identify the source of the expected data in the side-link control information and can be used to filter packets at the receiver's physical layer. The second bit string can be the MSB portion (16 bits) of the Source Layer 2 ID and can be carried within the MAC header. This can be used to filter packets at the receiver's MAC layer. The Destination Layer 2 ID identifies the destination of data in NR sidelink communication. For NR sidelink communication, the Destination Layer 2 ID can be 24 bits long and can be split into two bit strings at the MAC layer: one bit string can be the LSB portion (16 bits) of the Destination Layer 2 ID and is forwarded to the sender's physical layer. This can identify the destination of the expected data in the sidelink control information and can be used to filter packets at the receiver's physical layer. The second bit string can be the MSB portion (8 bits) of the Destination Layer 2 ID and can be carried in the MAC header. This can be used to filter packets at the receiver's MAC layer. The PC5 Link Identifier uniquely identifies a PC5 unicast link in the UE for the lifetime of the PC5 unicast link. The PC5 Link Identifier can be used to indicate a PC5 unicast link that has made a sidelink radio link failure (RLF) declaration and whose PC5-RRC connection has been released.

[0048] Figure 2A and Figure 2B Examples of radio protocol stacks for the user plane and control plane, respectively, are shown, representing some aspects of one or more exemplary embodiments of this disclosure. Figure 2AAs shown, the protocol stack for the user plane of the Uu interface (between UE 125 and gNB 115) includes Service Data Adaptation Protocol (SDAP) 201 and SDAP 211, Packet Data Convergence Protocol (PDCP) 202 and PDCP 212, Radio Link Control (RLC) 203 and RLC 213, Layer 2 MAC 204 and MAC 214 sublayers, and Physical (PHY) 205 and PHY 215 layers (Layer 1 is also referred to as L1).

[0049] PHY 205 and PHY 215 provide transport channels 244 to the MAC 204 and MAC 214 sublayers. The MAC 204 and MAC 214 sublayers provide logical channels 243 to the RLC 203 and RLC 213 sublayers. The RLC 203 and RLC 213 sublayers provide RLC channels 242 to the PDCP 202 and PDCP 212 sublayers. The PDCP 202 and PDCP 212 sublayers provide radio bearers 241 to the SDAP 201 and SDAP 211 sublayers. Radio bearers can be classified into two groups: Data Radio Bearers (DRBs) for user plane data and Signaling Radio Bearers (SRBs) for control plane data. The SDAP 201 and SDAP 211 sublayers provide QoS streams 240 to 5GC.

[0050] The main services and functions of the MAC 204 or MAC 214 sublayer include: mapping between logical channels and transport channels; multiplexing MAC Service Data Units (SDUs) belonging to one or different logical channels into / demultiplexing them from transport blocks (TBs) passed to the physical layer on the transport channel; scheduling of information reports; error correction via Hybrid Automatic Repeat Request (HARQ) (one HARQ entity per cell in the case of Carrier Aggregation (CA)); priority handling among UEs using dynamic scheduling; priority handling among logical channels of a UE via Logical Channel Prioritization (LCP); priority handling among overlapping resources of a UE; and padding. A single MAC entity can support multiple parameter sets (numerology), transmission timings, and cells. Mapping constraints in logical channel priorities control which parameter set(s), cells(s), and transmission timings(s) a logical channel can use.

[0051] The HARQ function ensures delivery between peer entities at Layer 1. When the physical layer is not configured for downlink / uplink spatial multiplexing, a single HARQ process can support one TB, and when the physical layer is configured for downlink / uplink spatial multiplexing, a single HARQ process can support one or more TBs.

[0052] The RLC 203 or RLC 213 sublayer can support three transmission modes: Transparent Mode (TM); Unacknowledged Mode (UM); and Acknowledged Mode (AM). RLC configuration can be applied to each logical channel, regardless of the parameter set and / or transmission duration, and Automatic Repeat Request (ARQ) can operate on any parameter set and / or transmission duration configured for the logical channel.

[0053] The primary services and functions of the RLC 203 or RLC 213 sublayer depend on the transport mode (e.g., TM, UM, or AM) and may include: transmission of upper-layer PDUs; sequence numbering independent of sequence numbering in PDCP (UM and AM); error correction via ARQ (AM only); segmentation (AM and UM) and resegmentation (AM only) of RLC SDUs; reassembly of SDUs (AM and UM); duplicate detection (AM only); RLC SDU discarding (AM and UM); RLC reconstruction; and protocol error detection (AM only).

[0054] Automatic repeat requests within the RLC 203 or RLC 213 sublayer may have the following features: ARQ retransmits RLC SDUs or RLC SDU segments based on RLC status reports; polling of RLC status reports can be used when needed by the RLC; and the RLC receiver can also trigger an RLC status report after detecting a lost RLC SDU or RLC SDU segment.

[0055] The main services and functions of the PDCP 202 or PDCP 212 sublayer may include: data transmission (user plane or control plane); maintenance of PDCP sequence numbers (SN); header compression and decompression using the Robust Header Compression (ROHC) protocol; header compression and decompression using the EHC protocol; encryption and decryption; integrity protection and integrity verification; timer-based SDU discarding; routing of split bearers; duplication; reordering and ordered delivery; out-of-order delivery; and duplicate discarding.

[0056] The main services and functions of SDAP 201 or SDAP 211 include: mapping between QoS flows and data radio bearers; and marking QoS flow IDs (QFIs) in downlink and uplink packets. A single protocol entity for SDAP can be configured for each individual PDU session.

[0057] like Figure 2BAs shown, the protocol stack of the control plane of the Uu interface (between UE 125 and gNB 115) includes the PHY layer (layer 1), and the MAC, RLC and PDCP sublayers of layer 2 as described above, as well as the RRC 206 sublayer and RRC 216 sublayer. The main services and functions of the RRC 206 and RRC 216 sublayers on the Uu interface include: broadcasting system information related to AS and NAS; paging initiated by 5GC or NG-RAN; establishment, maintenance, and release of RRC connections between UE and NG-RAN (including the addition, modification, and release of carrier aggregation; and the addition, modification, and release of dual connections in NR or between E-UTRA and NR); security functions including key management; establishment, configuration, maintenance, and release of SRB and DRB; mobility functions (including handover and context transfer; UE cell selection and reselection and control of cell selection and reselection; and inter-RAT mobility); QoS management functions; UE measurement reporting and control of such reporting; detection and recovery from radio link failures; and NAS message transmission from UE to NAS and from NAS to UE. NAS 207 and NAS 227 layers are control protocols that perform functions such as authentication, mobility management, and security control (terminating at the network-side AMF).

[0058] The specific services and functions of the sidelink in the RRC sublayer on the Uu interface include: configuration of sidelink resource allocation via system information or dedicated signaling; reporting of UE sidelink information; configuration and reporting of sidelink-related measurements; and reporting of UE auxiliary information for (one or more) SL service modes.

[0059] Figure 3A , Figure 3B and Figure 3CExample mappings between logical channels and transport channels in the downlink, uplink, and sidelink according to one or more exemplary embodiments of this disclosure are shown respectively. Different types of data transmission services can be provided by MAC. Each logical channel type can be defined by what type of information is transmitted. Logical channels can be classified into two groups: control channels and traffic channels. Control channels can be used only for the transmission of control plane information. The Broadcast Control Channel (BCCH) is a downlink channel used for broadcasting system control information. The Paging Control Channel (PCCH) is a downlink channel carrying paging messages. The Common Control Channel (CCCH) is a channel used for transmitting control information between the UE and the network. This channel can be used by UEs without a network RRC connection. The Dedicated Control Channel (DCCH) is a point-to-point bidirectional channel for transmitting dedicated control information between the UE and the network and can be used by UEs with an RRC connection. Traffic channels can be used only for the transmission of user plane information. A Dedicated Traffic Channel (DTCH) is a point-to-point channel dedicated to a single UE for transmitting user information. DTCHs can exist in both the uplink and downlink. A Sidelink Control Channel (SCCH) is a sidelink channel used to transmit control information (e.g., PC5-RRC and PC5-S messages) from one UE to another (or more) UEs. A Sidelink Traffic Channel (STCH) is a sidelink channel used to transmit user information from one UE to another (or more) UEs. A Sidelink Broadcast Control Channel (SBCCH) is a sidelink channel used to broadcast sidelink system information from one UE to another (or more) UEs.

[0060] Downlink transport channel types include Broadcast Channel (BCH), Downlink Shared Channel (DL-SCH), and Paging Channel (PCH). BCH is characterized by: a fixed, predefined transmission format; and the requirement to broadcast as a single message or through beamforming of different BCH examples throughout the cell's coverage area. DL-SCH is characterized by: support for HARQ; support for dynamic link adaptation by changing modulation, coding, and transmission power; the possibility of broadcasting throughout the cell; the possibility of using beamforming; support for dynamic and semi-static resource allocation; and support for Discontinuous Reception (DRX) to achieve UE power savings. The features of a PCH may include: supporting discontinuous reception (DRX) for UE power saving (DRX period is indicated to the UE by the network); broadcasting requirements as a single message or through different BCH examples via beamforming throughout the cell's coverage area; and mapping to physical resources that can also be dynamically used for traffic / other control channels.

[0061] In the downlink, the following connections can exist between logical channels and transport channels: BCCH can be mapped to BCH; BCCH can be mapped to DL-SCH; PCCH can be mapped to PCH; CCCH can be mapped to DL-SCH; DCCH can be mapped to DL-SCH; and DTCH can be mapped to DL-SCH.

[0062] Uplink transport channel types include Uplink Shared Channel (UL-SCH) and (one or more) Random Access Channels (RACH). UL-SCH is characterized by: the possibility of beamforming; support for dynamic link adaptation through variations in transmission power and possible modulation and coding; support for HARQ; and support for dynamic and semi-static resource allocation. RACH can be characterized by limited control information and collision risk.

[0063] In the uplink, the following connections can exist between logical channels and transport channels: CCCH can be mapped to UL-SCH; DCCH can be mapped to UL-SCH; and DTCH can be mapped to UL-SCH.

[0064] Sidelink transmission channel types include: Sidelink broadcast channel (SL-BCH) and Sidelink shared channel (SL-SCH). SL-BCH can be characterized by a predefined transmission format. SL-SCH features include: support for unicast, multicast, and broadcast transmission; support for UE-autonomous resource selection and scheduling by NG-RAN; support for dynamic and semi-static resource allocation when NG-RAN allocates resources to the UE; support for HARQ; and support for dynamic link adaptation by changing transmission power, modulation, and coding.

[0065] In a side link, the following connections can exist between logical channels and transport channels: SCCH can be mapped to SL-SCH; STCH can be mapped to SL-SCH; and SBCCH can be mapped to SL-BCH.

[0066] Figure 4A , Figure 4B and Figure 4C Example mappings between transport channels and physical channels in the downlink, uplink, and sidelink according to one or more exemplary embodiments of this disclosure are shown respectively. The physical channels in the downlink include the Physical Downlink Shared Channel (PDSCH), the Physical Downlink Control Channel (PDCCH), and the Physical Broadcast Channel (PBCH). The PCH and DL-SCH transport channels are mapped to the PDSCH. The BCH transport channel is mapped to the PBCH. The transport channels are not mapped to the PDCCH but instead transmit downlink control information (DCI) via the PDCCH.

[0067] The physical channels in the uplink include the Physical Uplink Shared Channel (PUSCH), the Physical Uplink Control Channel (PUCCH), and the Physical Random Access Channel (PRACH). The UL-SCH transport channel can be mapped to the PUSCH, and the RACH transport channel can be mapped to the PRACH. The transport channels are not mapped to the PUCCH; instead, uplink control information (UCI) is transmitted via the PUCCH.

[0068] The physical channels in the sidelink include the Physical Sidelink Shared Channel (PSSCH), the Physical Sidelink Control Channel (PSCCH), the Physical Sidelink Feedback Channel (PSFCH), and the Physical Sidelink Broadcast Channel (PSBCH). The PSCCH indicates the resources and other transmission parameters used by the UE for the PSSCH. The PSSCH transmits the data's TB itself, as well as control information for the HARQ process and Channel State Information (CSI) feedback triggers. At least six Orthogonal Frequency Division Multiplexing (OFDM) symbols within a time slot can be used for PSSCH transmission. The Physical Sidelink Feedback Channel (PSFCH) can carry HARQ feedback on the sidelink from the UE intended to receive the PSSCH transmission to the UE performing the transmission. The PSFCH sequence can be transmitted in a PRB (Physical Backlink Buffer) repeated on two OFDM symbols near the end of the sidelink resource within a time slot. The SL-SCH transport channel can be mapped to the PSSCH. The SL-BCH can be mapped to the PSBCH. No transport channels are mapped to the PSFCH, but Sidelink Feedback Control Information (SFCI) can be mapped to the PSFCH. No transport channels are mapped to the PSCCH, but Sidelink Control Information (SCI) can be mapped to the PSCCH.

[0069] Figure 5A , Figure 5B , Figure 5C and Figure 5D Examples of radio protocol stacks for NR-side link communication are shown, illustrating some aspects of one or more exemplary embodiments of this disclosure. The AS protocol stack for the user plane (i.e., for STCH) in the PC5 interface may consist of SDAP, PDCP, RLC, and MAC sublayers, as well as a physical layer. The user plane protocol stack in... Figure 5A As shown in the diagram, the SBCCH AS protocol stack in the PC5 interface can consist of RRC, RLC, MAC sublayer, and physical layer, as follows: Figure 5BAs shown in the diagram. To support the PC5-S protocol, PC5-S sits above the PDCP, RLC, and MAC sublayers and the physical layer in the control plane protocol stack of the SCCH used for PC5-S, as shown in the diagram. Figure 5C As shown in the diagram, the AS protocol stack of the control plane for the SCCH of RRC in the PC5 interface consists of RRC, PDCP, RLC, and MAC sublayers, as well as the physical layer. The protocol stack of the control plane for the SCCH of RRC is shown in... Figure 5D As shown in the image.

[0070] Sidelink radio bearers (SLRBs) can be classified into two groups: sidelink data radio bearers (SL DRBs) for user plane data and sidelink signaling radio bearers (SL SRBs) for control plane data. Separate SL SRBs with different SCCHs can be configured for PC5-RRC and PC5-S signaling respectively.

[0071] The MAC sublayer can provide the following services and functions through the PC5 interface: radio resource selection; packet filtering; prioritization of processing between uplink and sidelink transmissions for a given UE; and sidelink CSI reporting. With logical channel prioritization constraints in the MAC, for each unicast, multicast, and broadcast transmission that may be associated with a destination, only sidelink logical channels belonging to the same destination can be multiplexed as a MAC PDU. For packet filtering, an SL-SCH MAC header including portions of the source 2ID and destination 2ID can be added to the MAC PDU. The Logical Channel Identifier (LCID) included in the MAC subheader can uniquely identify logical channels within the range of the source 2ID and destination 2ID combination.

[0072] Services and functions of the RLC sublayer can be supported for sidelinks. RLC unacknowledged mode (UM) and acknowledged mode (AM) can be used in unicast transmissions, while only UM can be used in multicast or broadcast transmissions. For UM, only unidirectional transmissions of multicast and broadcast can be supported.

[0073] The services and functions of the PDCP sublayer for the Uu interface can be supported for sidelinks with the following limitations: out-of-order delivery can be supported only for unicast transmission; and duplication can not be supported on the PC5 interface.

[0074] The SDAP sublayer can provide the following services and functions through the PC5 interface: mapping between QoS flows and sidelink data radio bearers. For each destination, there can be one SDAP entity, representing one of the unicast, multicast, or broadcast traffic types associated with it.

[0075] The RRC sublayer can provide the following services and functions through the PC5 interface: transmission of PC5-RRC messages between peer UEs; maintenance and release of PC5-RRC connections between two UEs; and detection of sidelink radio link failures of PC5-RRC connections based on indications from the MAC or RLC. A PC5-RRC connection can be a logical connection between two UEs for a pair of source 2IDs and destination 2IDs, which can be considered to be established after the corresponding PC5 unicast link is established. There can be a one-to-one correspondence between PC5-RRC connections and PC5 unicast links. For different source 2 and destination 2ID pairs, a UE can have multiple PC5-RRC connections with one or more UEs. Separate PC5-RRC procedures and messages can be used by a UE to transmit UE capabilities and sidelink configurations, including SL-DRB configuration, to its peer UE. Two peer UEs can use separate bidirectional procedures in both sidelink directions to exchange their own UE capabilities and sidelink configurations.

[0076] Figure 6Example physical signals in the downlink, uplink, and sidelink according to one or more exemplary embodiments of this disclosure are illustrated. A demodulation reference signal (DM-RS) can be used in the downlink, uplink, and sidelink and can be used for channel estimation. The DM-RS is a UE-specific reference signal and can be transmitted along with the physical channel in the downlink, uplink, or sidelink, and can be used for channel estimation and coherent detection of the physical channel. A phase tracking reference signal (PT-RS) can be used in the downlink, uplink, and sidelink and can be used to track the phase and mitigate performance loss due to phase noise. PT-RS is primarily used to estimate and minimize the impact of common phase error (CPE) on system performance. Due to phase noise characteristics, the PT-RS signal may have low density in the frequency domain and high density in the time domain. PT-RS can occur in combination with DM-RS and occurs when the network configures PT-RS to be present. Positioning Reference Signal (PRS) can be used in the downlink for positioning using different positioning techniques. PRS can be used to measure downlink transmission delay by correlating the received signal from the base station with a local copy in the receiver. Channel State Information Reference Signal (CSI-RS) can be used in both the downlink and sidelink. Among other uses, CSI-RS can be used for channel state estimation, Reference Signal Received Power (RSRP) measurement for mobility and beam management, and time / frequency tracking for demodulation. CSI-RS can be specifically configured for the UE, but multiple users can share the same CSI-RS resource. The UE can determine CSI reports and transmit them to the base station in the uplink using PUCCH or PUSCH. CSI reports can be carried in the sidelink MAC control element (CE). Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS) can be used for radio frame synchronization. PSS and SSS can be used during the initial access process for cell search or for mobility purposes.Sounding Reference Signals (SRS) can be used in the uplink for uplink channel estimation. Similar to CSI-RS, SRS can be used as a QCL reference for other physical channels, allowing them to be configured and transmitted quasi-co-located with the SRS. Sidelink PSS (S-PSS) and Sidelink SSS (S-SSS) can be used for sidelink synchronization.

[0077] Figure 7 Examples of Radio Resource Control (RRC) states and transitions between different RRC states are illustrated according to one or more exemplary embodiments of this disclosure. The UE can be in one of three RRC states: RRC connected state 710, RRC idle state 720, and RRC inactive state 730. After power-on, the UE can be in RRC idle state 720, and the UE can use initial access and establish a connection with the network via the RRC connection establishment procedure to perform data transmission and / or make / receive voice calls. Once the RRC connection is established, the UE can be in RRC connected state 710. The UE can use the RRC connection establishment / release procedure 740 to transition from RRC idle state 720 to RRC connected state 710 or from RRC connected state 710 to RRC idle state 720.

[0078] To reduce signaling load and latency caused by frequent transitions from RRC connected state 710 to RRC idle state 720 when the UE transmits frequent small data, RRC inactive state 730 can be used. In RRC inactive state 730, both the UE and gNB can store the AS context. This can result in a faster state transition from RRC inactive state 730 to RRC connected state 710. The UE can use RRC connection recovery / inactivity procedure 760 to transition from RRC inactive state 730 to RRC connected state 710 or from RRC connected state 710 to RRC inactive state 730. The UE can use RRC connection release procedure 750 to transition from RRC inactive state 730 to RRC idle state 720.

[0079] Figure 8Example frame structures and physical resources are shown for some aspects of one or more exemplary embodiments according to this disclosure. Downlink, uplink, or sidelink transmissions can be organized into frames with a duration of 10 ms, consisting of 10 (0 to 9) 1 ms subframes. Each subframe can consist of k time slots (k = 1, 2, 4…), where the number of time slots k in each subframe can depend on the subcarrier spacing of the carriers transmitted over it. The time slot duration can be 14 symbols (0 to 13) with a normal cyclic prefix (CP) and 12 symbols with an extended CP, and can be time-scaled as a function of the subcarrier spacing used, such that an integer number of time slots exist in the subframe. Figure 8 The resource grid is shown in the time and frequency domains. Each element of the resource grid, which consists of a time symbol and a frequency subcarrier, is called a resource element (RE). A resource block (RB) can be defined as 12 consecutive subcarriers in the frequency domain.

[0080] In some examples, and in the case of non-slot-based scheduling, packet transmission can occur on a portion of a time slot, such as during two, four, or seven OFDM symbols; this can also be referred to as a time slot. Time slots can be used for low-latency applications, such as URLLC and operation in unlicensed frequency bands. In some embodiments, time slots can also be used for fast and flexible scheduling of services (e.g., preemption of URLLC over eMBB).

[0081] Figure 9 Example component carrier configurations in different carrier aggregation scenarios are illustrated according to one or more exemplary embodiments of this disclosure. In carrier aggregation (CA), two or more component carriers (CCs) can be aggregated. The UE can receive or transmit simultaneously on one or more CCs depending on its capabilities. Figure 9 As shown, CA can be supported for consecutive and non-consecutive CCs on the same or different frequency bands. The gNB and UE can communicate using the serving cell. The serving cell can be associated with at least one downlink CC (e.g., it can be associated with only one downlink CC, or it can be associated with both downlink and uplink CCs). The serving cell can be a primary cell (PCell) or a secondary cell (SCell).

[0082] The UE can use the uplink timing control procedure to adjust the timing of its uplink transmissions. Timing Advance (TA) can be used to adjust the uplink frame timing relative to the downlink frame timing. The gNB can determine the required timing advance setting and provide it to the UE. The UE can use the provided TA to determine its uplink transmission timing relative to the downlink receive timing observed by the UE.

[0083] In RRC connected state, the gNB is responsible for maintaining timing advance to keep L1 synchronized. Serving cells with uplinks applying the same timing advance and using the same timing reference cell are grouped into Timing Advance Groups (TAGs). A TAG can contain at least one serving cell with a configured uplink. The mapping from serving cell to TAG can be configured by RRC. For a primary TAG, the UE can use the PCell as the timing reference cell, except for those with shared spectrum channel access, where the SCell can also be used as the timing reference cell in some cases. In a secondary TAG, the UE can use any active SCell of that TAG as the timing reference cell, and can leave it unchanged unless necessary.

[0084] Pre-updates can be signaled to the UE by the gNB via a MAC CE command. Such a command can restart a TAG-specific timer that indicates whether L1 can be synchronized: when the timer is running, L1 can be considered synchronized; otherwise, L1 can be considered asynchronous (in which case, uplink transmissions may occur only on PRACH).

[0085] A UE with a single timing advance capability for CA can simultaneously receive and / or transmit on multiple CCs corresponding to multiple serving cells (multiple serving cells in a group) sharing the same timing advance. A UE with multiple timing advance capabilities for CA can simultaneously receive and / or transmit on multiple CCs corresponding to multiple serving cells (multiple serving cells in multiple groups). NG-RAN can ensure that each TAG contains at least one serving cell. A UE without CA capability can receive on a single CC and can transmit on a single CC corresponding to only one serving cell (one serving cell in a TAG).

[0086] In the case of CA, the physical layer's multi-carrier characteristics can be exposed to the MAC layer, and each serving cell may require a HARQ entity. When CA is configured, the UE can have an RRC connection with the network. During RRC connection establishment / re-establishment / handover, a serving cell (e.g., PCell) can provide NAS mobility information. Depending on the UE's capabilities, SCells can be configured to form a serving cell set together with the PCell. The serving cell set configured for the UE can consist of one PCell and one or more SCells. Reconfiguration, addition, and removal of SCells can be performed by RRC.

[0087] In a dual-connectivity scenario, a UE can be configured with multiple cells, including a Master Cell Group (MCG) for communicating with the master base station, a Secondary Cell Group (SCG) for communicating with the secondary base station, and two MAC entities: one for the MCG for communicating with the master base station and one for the SCG for communicating with the secondary base station.

[0088] Figure 10 Example partial bandwidth configurations and handovers are illustrated according to one or more exemplary embodiments of this disclosure. A UE may be configured with one or more partial bandwidths (BWPs) 1010 (e.g., 1010A, 1010B) on a given member carrier. In some examples, one of the one or more partial bandwidths is active at any given time. The active partial bandwidth may define the UE's operating bandwidth within the cell's operating bandwidth. For initial access, and until the UE's configuration in the cell is received, an initial partial bandwidth 1020 determined based on system information may be used. Utilizing bandwidth adaptation (BA), for example via BWP handover 1040, the UE's receive and transmit bandwidths may not be as large as the cell's bandwidth and may be adjusted. For example, the width may be commanded to change (e.g., shrinking during periods of low activity to save power); the location may be moved in the frequency domain (e.g., to increase scheduling flexibility); and the subcarrier spacing may be commanded to change (e.g., to allow different services). The first active BWP 1030 may be an active BWP for active RRC (re)configuration for a PCell or SCell.

[0089] For each downlink or uplink BWP in the set of downlink or uplink BWPs, the following configuration parameters can be provided to the UE: Subcarrier Spacing (SCS); Cyclic Prefix; Common RB and multiple consecutive RBs; Index of the corresponding BWP-Id in the set of downlink or uplink BWPs; Set of BWP Common Parameters and Set of BWP Specific Parameters. Based on the configured subcarrier spacing and cyclic prefix of the BWP, the BWP can be associated with an OFDM parameter set. For the serving cell, the UE can be provided with a default downlink BWP from the configured downlink BWPs. If the UE is not provided with a default downlink BWP, the default downlink BWP can be the initial downlink BWP.

[0090] A downlink BWP can be associated with a BWP inactivity timer. If the BWP inactivity timer associated with the active downlink BWP expires, and if a default downlink BWP is configured, the UE can perform a BWP handover to the default BWP. If the BWP inactivity timer associated with the active downlink BWP expires, and if no default downlink BWP is configured, the UE can perform a BWP handover to the initial downlink BWP.

[0091] Figure 11 The following examples illustrate a four-step contention-based random access (CBRA) procedure and a contention-free random access (CFRA) procedure, representing some aspects of one or more exemplary embodiments of this disclosure. Figure 12Example two-step contention-based random access (CBRA) and contention-free random access (CFRA) procedures are shown, illustrating some aspects of one or more exemplary embodiments of this disclosure. The random access procedure may be triggered by multiple events, such as: initial access from an RRC idle state; RRC connection reconstruction process; arrival of downlink or uplink data during an RRC connected state when the uplink synchronization state is “asynchronous”; arrival of uplink data during an RRC connected state when no PUCCH resource is available for a scheduling request (SR); SR failure; a request from the RRC during synchronization reconfiguration (e.g., handover); transition from an RRC inactive state; establishing time alignment for a second TAG; requesting additional system information (SI); beam failure recovery (BFR); and consistent uplink listen-before-talk (LBT) failure.

[0092] It supports two types of random access (RA) procedures: a 4-step RA type with MSG1 and a 2-step RA type with MSGA. Both types of RA procedures can support, for example, Figure 11 and Figure 12 The examples shown are contention-based random access (CBRA) and contention-free random access (CFRA).

[0093] The UE can select the type of random access at the start of the random access procedure based on network configuration. When no CFRA resources are configured, the UE can use the RSRP threshold to select between the 2-step RA type and the 4-step RA type. When CFRA resources are configured for the 4-step RA type, the UE can perform random access using the 4-step RA type. When CFRA resources are configured for the 2-step RA type, the UE can perform random access using the 2-step RA type.

[0094] A 4-step RA type MSG1 can be composed of a preamble on a PRACH ( Figure 11 Step 1 of CBRA (in the context of MSG1 transmission). After MSG1 transmission, the UE can monitor the response from the network within the configured window ( Figure 11 Step 2 of CBRA). For CFRA, the dedicated preamble for MSG1 transmission can be allocated by the network ( Figure 11 In step 0 of the CFRA, and upon receiving a Random Access Response (RAR) from the network, the UE can terminate the process as follows: Figure 11 The random access procedure shown in the figure Figure 11Steps 1 and 2 of CFRA). For CBRA, upon receiving the random access response ( Figure 11 During step 2 of the CBRA, the UE can use the uplink grant scheduled in the random access response to send MSG3 ( Figure 11 Step 3 of the CBRA, and can be as follows Figure 11 The ground monitoring contention resolution shown in the figure ( Figure 12 (Step 4 of CBRA). If contention resolution fails after (one or more) MSG3 (re)transmissions, the UE can return to MSG1 transmission.

[0095] A 2-step RA type MSGA can include a preamble on the PRACH and a payload on the PUSCH (e.g., Figure 12 Step A of CBRA. After MSGA transmission, the UE can monitor the response from the network within a configured window. For CFRA, dedicated preamble and PUSCH resources can be configured for MSGA transmission ( Figure 12 In CFRA steps 0 and A), and upon receiving the network response ( Figure 12 During step B) of CFRA, the UE can end as follows: Figure 12 The random access procedure is shown. For CBRA, if contention is successfully resolved upon receiving a network response ( Figure 12 If step B) of the CBRA is completed, the UE can end as follows: Figure 13 The random access procedure is shown in the diagram. If a backoff indication is received in the MSGB, the UE can use the uplink grant scheduled in the backoff indication to perform an MSG3 transmission and can monitor contention resolution. If contention resolution fails after (one or more) MSG3 (re)transmissions, the UE can return to an MSGA transmission.

[0096] Figure 13 Example time and frequency structures of synchronization signals and Physical Broadcast Channel (PBCH) blocks (SSBs) according to one or more exemplary embodiments of this disclosure are shown. An SS / PBCH block (SSB) may consist of a primary synchronization signal and a secondary synchronization signal (PSS, SSS), each occupying one symbol and 127 subcarriers (e.g., Figure 13 The subcarriers are numbered 56 to 182, and the PCBH spans 3 OFDM symbols and 240 subcarriers, but leaves an unused portion in the middle of one symbol for the SSS, such as... Figure 14 As shown in the diagram, the possible temporal location of the SSB within a half-frame can be determined by the subcarrier spacing, and the period of the half-frame for transmitting the SSB can be configured by the network. During the half-frame, different SSBs can be transmitted in different spatial directions (i.e., using different beams that span the coverage area of ​​the cell).

[0097] The PBCH can be used to carry the Master Information Block (MIB) used by the UE during cell search and initial access procedures. The UE can first decode the PBCH / MIB to receive other system information. The MIB can provide the UE with the parameters required to obtain System Information Block 1 (SIB1), and more specifically, provide the information required to monitor the PDCCH used to schedule the PDSCH carrying SIB1. In addition, the MIB can indicate cell prohibition status information. The MIB and SIB1 can be collectively referred to as the Minimum System Information (SI), and SIB1 can be referred to as the Remaining Minimum System Information (RMSI). Other System Information Blocks (SIBs) (e.g., SIB2, SIB3...SIB10 and SIBpos) can be referred to as other SIs. Other SIs can be broadcast periodically on the DL-SCH, broadcast on demand on the DL-SCH (e.g., upon request from a UE in an RRC idle state, an RRC inactive state, or an RRC connected state), or sent on the DL-SCH in a dedicated manner to UEs in an RRC connected state (e.g., if configured by the network, upon request from a UE in an RRC connected state, or when the UE has an active BWP that is not configured with a common search space).

[0098] Figure 15 Example SSB burst transmissions are illustrated according to one or more exemplary embodiments of this disclosure. An SSB burst may include N SSBs (e.g., SSB_1, SSB_2…SSB_N), and each of the N SSBs may correspond to a beam (e.g., beam_1, beam_2…beam_N). SSB bursts may be transmitted according to a period (e.g., SSB burst periods). During a contention-based random access procedure, the UE may perform a random access resource selection procedure, whereby the UE first selects an SSB before selecting an RA preamble. The UE may select an SSB with an RSRP higher than a configured threshold. In some embodiments, if no SSB with an RSRP higher than the configured threshold is available, the UE may select any SSB. A set of random access preambles may be associated with an SSB. After selecting an SSB, the UE may select a random access preamble from the set of random access preambles associated with the SSB, and may transmit the selected random access preamble to initiate the random access procedure.

[0099] In some embodiments, beams among the N beams may be associated with CSI-RS resources (e.g., CSI-RS_1, CSI-RS_2, ..., CSI-RS_N). The UE can measure the CSI-RS resources and select CSI-RSs with RSRP higher than a configured threshold. The UE can select a random access preamble corresponding to the selected CSI-RS and can transmit the selected random access procedure to begin the random access procedure. If there is no random access preamble associated with the selected CSI-RS, the UE can select a random access preamble corresponding to an SSB that is quasi-in-line with the selected CSI-RS.

[0100] In some embodiments, based on UE measurements and UE CSI reports using CSI-RS resources, the base station can determine the Transmission Configuration Indication (TCI) state and can indicate the TCI state to the UE, whereby the UE can use the indicated TCI state to receive downlink control information (e.g., via PDCCH) or data (e.g., via PDSCH). The UE can use the indicated TCI state to receive data or control information using an appropriate beam. The TCI state indication can use RRC configuration or a combination of RRC signaling and dynamic signaling (e.g., via MAC Control Element (MAC CE) and / or based on field values ​​in downlink control information that schedules downlink transmissions). The TCI state can indicate a quasi-colocation (QCL) relationship between a downlink reference signal such as CSI-RS and a DM-RS associated with a downlink control or data channel (e.g., PDCCH or PDSCH, respectively).

[0101] In some embodiments, the UE can configure, using a list of up to M TCI states configured with Physical Downlink Shared Channel (PDSCH) configuration parameters, to decode the PDSCH based on the detected PDCCH, where the DCI is intended for both the UE and a given serving cell, and M may depend on the UE's capabilities. Each TCI state may contain parameters for configuring the QCL relationship between one or more downlink reference signals and the DM-RS port of the PDSCH, the DM-RS port of the PDCCH, or one or more CSI-RS ports of the CSI-RS resources. This quasi-correspondence relationship may be configured by one or more RRC parameters. The quasi-correspondence type corresponding to each DL RS may take one of the following values: "QCL-TypeA": {Doppler shift, Doppler spread, average delay, delay spread}; "QCL-TypeB": {Doppler shift, Doppler spread}; "QCL-TypeC": {Doppler shift, average delay}; "QCL-type": {spatial reception parameters}. The UE can receive activation commands (e.g., MAC CE) for mapping TCI states to code points in the DCI field.

[0102] Figure 15 Example components of a user equipment and base station for transmission and / or reception are shown, representing some aspects of one or more exemplary embodiments according to this disclosure. In one embodiment, Figure 15 The illustrative components can be considered as illustrative examples of functional blocks of the illustrative base station 1505. In another embodiment, Figure 15 The illustrative components can be considered as illustrative examples of functional blocks of the illustrative user equipment (UE) 1500. Therefore, Figure 15 The components shown are not limited to UE or base station.

[0103] refer to Figure 15 Antenna 1510 can be used for the transmission or reception of electromagnetic signals. Antenna 1510 may include one or more antenna elements and can implement different input / output antenna configurations, including Multiple-Input Multiple-Output (MIMO), Multiple-Input Single-Output (MISO), and Single-Input Multiple-Output (SIMO) configurations. In some embodiments, antenna 1510 can implement a large number of MIMO configurations with dozens or hundreds of antenna elements. Antenna 1510 can implement other multi-antenna techniques such as beamforming. In some examples, and depending on the capabilities or type of UE 1500 (e.g., low-complexity UE), UE 1500 may support only a single antenna.

[0104] Transceiver 1520 can communicate bidirectionally via antenna 1510 and a wireless link as described herein. For example, transceiver 1520 can represent a wireless transceiver at a UE and can communicate bidirectionally with a wireless transceiver at a base station, or vice versa. Transceiver 1520 may include a modem for modulating packets and providing the modulated packets to antenna 1510 for transmission, and for demodulating packets received from antenna 1510.

[0105] Memory 1530 may include RAM and ROM. Memory 1530 may store computer-readable, computer-executable code 1535, including instructions that, when executed, cause the processor to perform the various functions described herein. In some examples, memory 1530 may, among others, include a Basic Input / Output System (BIOS) that controls basic hardware or software operations, such as interaction with peripheral components or devices.

[0106] Processor 1540 may include hardware devices with processing capabilities (e.g., a general-purpose processor, a digital signal processor (DSP), a central processing unit (CPU), a microcontroller, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), a programmable logic device, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some examples, processor 1540 may be configured to operate memory using a memory controller. In other examples, the memory controller may be integrated into processor 1540. Processor 1540 may be configured to execute computer-readable instructions stored in memory (e.g., memory 1530) to cause UE 1500 or base station 1505 to perform various functions.

[0107] CPU 1550 can execute basic arithmetic, logic, control, and input / output (I / O) operations specified by computer instructions stored in memory 1530. UE 1500 and / or base station 1505 may include additional peripheral components such as a Graphics Processing Unit (GPU) 1560 and a Global Positioning System (GPS) 1570. GPU 1560 is dedicated circuitry for rapidly manipulating and modifying memory 1530 to accelerate the processing performance of UE 1500 and / or base station 1505. GPS 1570 can be used, for example, to enable location-based services or other services based on the geographic location of UE 1500.

[0108] In some examples, the UE can operate in multiple modes for resource allocation in the sidelink, including scheduled resource allocation and UE-autonomous resource selection. In scheduled resource allocation, the UE can be in an RRC connection (RRC_CONNECTED) for data transmission. The NG-RAN / base station can schedule transmission resources. In UE-autonomous resource selection, the UE can transmit data when within NG-RAN coverage, regardless of its RRC state, and when outside NG-RAN coverage. The UE can autonomously select transmission resources from one or more resource pools. In some examples, for NR sidelink communication, the UE can perform sidelink transmission on only a single carrier.

[0109] In some examples, for scheduling resource allocation, the NG-RAN / base station can dynamically allocate resources to the UE via SL-RNTI for NR-side link communication on (one or more) PDCCHs.

[0110] In some examples, NG-RAN can allocate sidelink resources to UEs with two types of configured sidelink grants (e.g., Type 1 and Type 2). Using Type 1 configured sidelink grants, RRC can directly provide a configured sidelink grant solely for NR sidelink communication. Using Type 2 configured sidelink grants, RRC can define the period of the configured sidelink grants, and the PDCCH can signal and activate or deactivate them. The PDCCH can be addressed to the SL-CS-RNTI for NR sidelink communication. In some examples, NG-RAN can semi-persistently allocate sidelink resources to the UE via the V-RNTI on one or more PDCCHs used for V2X sidelink communication. In some examples, for a UE performing NR sidelink communication, more than one configured sidelink grant can be active at a time on a carrier configured for sidelink transmission. In some examples, when a beamout or physical layer problem occurs on the MCG, the UE can continue to use configured sidelink grant type 1 until the RRC connection re-establishment procedure is initiated. During handover, configuration-side traverse authorization can be provided to the UE via a handover command, regardless of type. If provided, the UE can activate configuration-side traverse authorization type 1 upon receiving a handover command or performing a Conditional Handover (CHO).

[0111] In some examples, the UE can send a sidelink buffer status report to support scheduler operation in NG-RAN. The sidelink buffer status report can refer to buffered data for each destination's Group of Logical Channels (LCG) within the UE. In some examples, eight LCGs can be used to report the sidelink buffer status report. Two formats can be used: SL BSR and truncated SL BSR.

[0112] In some examples, for autonomous resource selection, the UE can autonomously select one or more sidelink resources from one or more resource pools provided by broadcast system information or dedicated signaling, either within or outside NG-RAN coverage. For NR sidelink communication, one or more resource pools can be provided for a given validity area, where the UE may not need to acquire a new resource pool when moving within that validity area (at least if the pool is provided by the SIB). The NR SIB area-range mechanism can be reused to enable validity areas for SL resource pools configured via broadcast system information. In some examples, the UE can be allowed to temporarily use UE autonomous resource selection with random selection for sidelink transmission based on the configuration of abnormal transmission resource pools.

[0113] In some examples, two sidelink resource allocation modes can be supported: Mode 1 and Mode 2. In Mode 1, sidelink resource allocation can be provided by the network. In Mode 2, the UE can determine the SL transmission resources in one or more resource pools.

[0114] In some examples, sidelink HARQ feedback can use the PSFCH and can operate in one of two options. In one option, which can be configured for unicast and multicast, the PSFCH can use resources dedicated to a single PSFCH transmission UE to transmit ACK or NACK. In another option, which can be configured for multicast, the PSFCH transmits NACK on resources that can be shared by multiple PSFCH transmission UEs, or it may not transmit the PSFCH signal. In some examples, in sidelink resource allocation mode 1, the UE receiving the PSFCH can report sidelink HARQ feedback to the gNB via PUCCH or PUSCH.

[0115] In some examples, NG-RAN can provide RRC reconfiguration to the UE to offer a dedicated side-link configuration. RRC reconfiguration may include one or more SLDRB configurations for NR side-link communication, as well as Mode 1 and / or Mode 2 resource configurations. If the UE has already received the SLDRB configuration via system information, it can continue to use that configuration for side-link data transmission and reception until it receives the new configuration via RRC reconfiguration.

[0116] In some examples, the UE can be configured by a higher layer that has one or more sidelink resource pools. The sidelink resource pools can be used for PSSCH transmission or PSSCH reception, and can be associated with sidelink resource allocation mode 1 or sidelink resource allocation mode 2.

[0117] In some examples, in the frequency domain, the sidelink resource pool can include consecutive subchannels with subchannel numbers (numSubchannel). Subchannels can include consecutive PRBs with subchannel sizes (subchannelsize), where the subchannel number and subchannel size are higher-layer parameters.

[0118] In some examples, in sidelink resource allocation mode 2, the UE can measure the RSRP for resource selection as follows: if the higher layer parameter s1-RS-ForSensing is set to psch, it is the PSSCH-RSRP on the DM-RS resource element of the received SCI format 1-A PSSCH, and if the higher layer parameter s1-RS-ForSensing is set to pscch, it is the PSCCH-RSRP carried on the DM-RS resource element of the received SCI format 1-A PSCCH.

[0119] In some examples, the UE can use a procedure for determining the subset of resources to report to the higher layer in PSSCH resource selection during sidelink resource allocation mode 2. In some examples, in resource allocation mode 2, the higher layer can request the UE to determine a subset of resources from which the higher layer can select resources for PSSCH / PSCCH transmission. To trigger this procedure, in slot n, the higher layer can provide the following parameters for that PSSCH / PSCCH transmission: the resource pool from which resources are to be reported; L1 priority (prio). TX Remaining packet delay budget; Number L of subchannels to be used for PSSCH / PSCCH transmission in a time slot. subCH Optionally, the resource reservation interval P rsvp_TX This is measured in milliseconds (ms). If a higher layer requests the UE to determine a subset of resources from which the higher layer can select resources for PSSCH / PSCCH transmission as part of a reassessment or preemption process, the higher layer can provide a set of resources that can withstand reassessment (r0, r1, r2, ...) and a set of resources that can withstand preemption (r'0, r'1, r'2, ...). The specific resource set in time slot r'' may be determined depending on the UE implementation. i -A subset of resources requested by a higher layer before or after T3, where r” i It can be the time slot with the smallest time slot index among (r0,r1,r2,...) and (r'0,r'1,r'2,...), and T3 can be equal to T. SL proc,1 .

[0120] In some examples, the following higher-level parameter affects the process: t2min_SelectionWindow: for a given prio TX Value, internal parameter t 2min Set to the corresponding value from the higher-level parameter t2min_SelectionWindow; SL-ThresRSRP_pi_pj: This higher-level parameter is for each combination (P i ,P j Provides the RSRP threshold, where P i It is the value of the priority field in the received SCI format 1-A, P j This is the priority of resource transmission selected by the UE; for a given call in this procedure, p j =prio TX ;RSforSensing selects whether the UE uses PSSCH-RSRP or PSCCH-RSRP for measurement; sl-ResourceReservePeriodList; t0_SensingWindow: The internal parameter T0 is defined as the number of time slots corresponding to t0_SensingWindow ms; s1-xPercentage: will be used for a given period TX The internal parameter X is defined as s1-xPercentage(prio) from the percentage to the ratio. TX p_preemption: Internal parameter Prio pre This is set to the higher level that provides the parameter p_preemption. In some examples, if a resource reservation interval P is provided... rsvp_TX Then it can be converted from the unit of ms to the unit of logical time slot, thus obtaining P' rsvp_TX .

[0121] In some examples, IE SL-ConfigDedicatedNR can specify dedicated configuration information for NR-side traversal communication. IE SL-ConfigDedicatedNR may include the sl-MeasConfigInfoToAddModList field indicating the RSRP measurement configuration for unicast destinations to be added and / or modified. The sl-MeasConfigInfoToReleaseList field can indicate the RSRP measurement configuration for unicast destinations to be removed. The s1-RadioBearerAddModList field can indicate one or more traversal radio bearer configurations. The NetworkControlledSyncTx field can indicate whether the UE can transmit synchronization information (e.g., become a synchronization source). The s1-maxNumConsecutiveDTX field can indicate the maximum number of consecutive HARQ DTXs before triggering a traversal RLF. The sl-FreqInfoToAddModList field can indicate the NR-side traversal communication configuration on one or more carrier frequencies. The s1-RLC-BearerAddModList field can indicate one or more traversal RLC bearer configurations. The s1-ScheduledConfig field indicates the configuration used by the UE to transmit NR-side traversal communication based on network scheduling. The sl-CSI-Acquisition field indicates whether CSI reporting is enabled in traversal unicast. The sl-CSI-SchedulingRequestId field indicates the scheduling request configuration applicable to the MAC CE of traversal CSI reporting. The s1-SSB-PriorityNR field indicates the priority of NR-side traversal SSB transmission and reception.

[0122] When a UE operates using a sidelink, a sidelink design based on an always-on mechanism can result in significant power consumption. Example implementations can enhance power savings for UEs operating in sidelinks. Power savings can be important for public safety use cases and for pedestrian UEs in V2X scenarios where the UE may have limited battery capacity. Example power savings can be based on partially aware sidelink resource allocation and random resource selection sidelink resource allocation. Partial awareness can be used for mode 2 sidelink operation. A subset of subframes / slots / symbols can be monitored / aware during the awareness window. Due to the shorter duration of the awareness mechanism, partial awareness can lead to power savings by reducing power consumption. Partial awareness can achieve reduced power consumption at the cost of an increased probability of resource conflicts. The increased probability of resource conflicts may be due to the UE not being able to collect complete channel occupancy information due to the reduced awareness time.

[0123] Depending on the usage (e.g., V2X usage, public safety usage, etc.), services can be aperiodic or periodic in nature. In the case of periodic services, configuration parameters (e.g., the RRC parameter gapCandidateSensing) can be used to determine the subframe / slot / symbol index (e.g., in multiples of 100ms) to perform channel awareness.

[0124] In some examples, sidelinks can support unicast and multicast transmissions, and features for unicast and multicast (e.g., HARQ feedback) can be utilized to improve partial sensing performance. A reduced sensing window can lead to a significant increase in collision probability, which may be undesirable for many critical use cases such as public safety. Physical layer features in unicast and multicast transmissions on sidelinks (e.g., HARQ feedback) can be leveraged to improve partial sensing performance.

[0125] In some examples, reassessment and preemption can effectively improve the performance of resource allocation for Mode 2, such as in partial awareness. Reassessment and preemption can achieve reduced conflict and reliability without requiring significant power consumption costs.

[0126] refer to Figure 15 In some examples, UE 1500 can be configured or programmed as a first UE for a mobile communication network including sidelink transmissions. UE 1500 may include stored instructions (e.g., Figure 15 The memory of code 1535 (e.g., Figure 15 The memory 1530) and the processor (e.g., Figure 15The processor 1540 is configured to execute the instructions to determine, based on a first-side cross-link resource allocation procedure, a first radio resource for one or more first-side cross-link transport blocks. Based on the first radio resource, the processor transmits the one or more first-side cross-link transport blocks to a second UE (not shown); receives first Hybrid Automatic Repeat Request (HARQ) feedback for the one or more first-side cross-link transport blocks; based on the HARQ feedback, determines whether to switch from the first-side cross-link resource allocation procedure to a second-side cross-link resource allocation procedure; in response to determining the switch to the second-side cross-link resource allocation procedure, determines, based on the second-side cross-link resource allocation procedure, a second radio resource for one or more second-side cross-link transport blocks; and based on the second radio resource, transmits the one or more second-side cross-link transport blocks. In these examples, the memory of UE 1500 (e.g., memory 1530) may store computer program code (e.g., code 1535) that can be executed by a processor (e.g., CPU 1550) to perform the functions of UE 1500.

[0127] In some examples, UE 1500 can be configured or programmed as a second UE for use in a mobile communication network including sidelink transmissions. UE 1500 may include stored instructions (e.g., Figure 16 The memory of code 1535 (e.g., Figure 17 The memory 1530) and the processor (e.g., Figure 17 The processor 1540 is configured to execute the instructions to receive one or more first-side cross-link transport blocks determined by the first UE (not shown) based on a first-side cross-link resource allocation procedure; transmit a first Hybrid Automatic Repeat Request (HARQ) feedback for the one or more first-side cross-link transport blocks to the first UE; and receive one or more second-side cross-link transport blocks determined by the first UE based on a second-side cross-link resource allocation procedure in response to the first UE determining a switch to a second-side cross-link resource allocation procedure. The second UE may transmit the HARQ feedback via a base station (e.g., base station 1505). In these examples, the memory of UE 1500 (e.g., memory 1530) may store computer program code (e.g., code 1535) that can be executed by a processor (e.g., CPU 1550) to perform the functions of UE 1500.

[0128] In some examples, UE 1500 and base station 1505 are included in a system for mobile communications including sidelink transmissions. UE 1500 may be configured or programmed as a first UE of the system. The system may include a second UE (not shown). The first UE may be configured or programmed to determine, based on a first sidelink resource allocation procedure, a first radio resource for one or more first sidelink transmission blocks, and to transmit the one or more first sidelink transmission blocks based on the first radio resource. The second UE may be configured or programmed to receive the one or more first sidelink transmission blocks and send a first Hybrid Automatic Repeat Request (HARQ) feedback to the first UE for the one or more first sidelink transmission blocks. The first UE may also be configured or programmed to determine, based on the HARQ feedback, whether to switch from a first sidelink resource allocation procedure to a second sidelink resource allocation procedure; in response to determining to switch to a second sidelink resource allocation procedure, determine, based on the second sidelink resource allocation procedure, a second radio resource for one or more second sidelink transmission blocks; and to transmit the one or more second sidelink transmission blocks to the second UE based on the second radio resource.

[0129] Figure 18 An exemplary partial sensing mechanism is shown for sidelink resource allocation based on assumed periodic traffic and pre-configured sensing times. For example, the time slot selected by the UE can be at time t. y At this point, the UE can select the time slot in the resource selection window. The UE can sense the channel in the sensing window (e.g., at time t). y -100 and t y -200 locations).

[0130] In some examples, partial sensing can be used to account for the aperiodic nature of the service. Pre-configuring sensing moments within a sensing window while assuming a specific period may not be efficient. In some examples, different service types with different periods (e.g., relatively short or long periods) can be available (e.g., 1:99, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000 in milliseconds). Partial sensing mechanisms can be enhanced to account for aperiodic services or periodic services with varying degrees of periodicity.

[0131] In some examples, when partial sensing is (pre-)configured for a resource pool, the UE can perform reduced sensing within a limited number of sensing moments. In some examples, its length can be (pre-configured) to be less than or less than the minimum number of consecutive sensing moments of a normal sensing window (e.g., it can be referred to as...). Figure 19 (The portion of the perception window shown).

[0132] exist Figure 20An example (pre-)configuration of a partial sensing window is shown. The partial sensing window duration can be defined as [n - T3, n - T proc,0 , where the value of T3 can be selected by the UE within a specific range. In some examples, the value of T3 can be adapted to optimize the performance of partial sensing.

[0133] In some examples, in a random resource selection mechanism, the UE can randomly select resources for transmission during its resource selection phase, without a prior sensing phase or a (re-)evaluation phase.

[0134] In some examples, for example, as Figure 17 shown, the UE can perform a selection between random resource selection and partial window sensing based on packet reception reliability. In some examples, the ratio of ACKs and NACKs can be used to make a selection between random resource selection and partial window sensing. In some examples, the UE can use random selection as the first mode of transmission resource selection and can transmit a sidelink transmission block based on the determined radio resources. The UE can receive one or more HARQ ACK / NACKs from the receiving UE in response to its transmission. If the ratio R = NACK / (ACK + NACK) of NACKs exceeds a threshold R0 (e.g., R > R0) within a moving interval T, the UE can stop random resource selection and can start partial window sensing.

[0135] In some examples, for example, as Figure 21 shown, the partial sensing window size can be modified based on the ratio of ACKs and NACKs. The UE can use partial window sensing selection with an initial window size W0 as its mode of transmission resource selection. There can be a set of window sizes W i , where i = 0, 1,..., n. The UE can receive an ACK or a NACK from the receiving UE in response to its transmission. In one embodiment, the ratio of ACKs or NACKs can be expressed as a percentage of the total feedback received (e.g., the sum of ACKs and NACKs). For example, if the ratio R = NACK / (ACK + NACK) of NACKs exceeds a threshold R1, e.g., R > R1, within a moving interval T, the UE can increase the window size to W1. After the next transmission, if R < R1, the UE can decrease the window size to W0. If R > R2, the UE can increase the window size to W2. Otherwise, the UE can continue to use the window size W1. This process can continue for a set of NACK ratios R i with corresponding window sizes W i (where i = 0, 1,..., n).

[0136] In some examples, the resource allocation method, the random or partial window, and the partial awareness window size can all be based on the ratio of ACKs and NACKs, such as the percentage of ACKs or NACKs based on the count of the received feedback. The two adaptive schemes described previously can be combined. For example, the UE can use random selection as the first mode of transmission resource selection. The UE can receive an ACK or NACK from the receiving UE in response to its transmission. If the ratio R = NACK / (ACK + NACK) of NACKs exceeds a threshold R0, e.g., R > R0, within a moving interval T, then the UE can stop random resource selection and can start partial window awareness with an initial window size W0. There can be a set of window sizes W i , where i = 0, 1,..., n. After the next transmission, if R < R0, then the UE can return to random selection of transmission resources. If R > R1, then the UE can increase the window size to W1. Otherwise, the UE can continue to use the window size W0. This process can be continued for a set of NACK ratios R i (where i = 0, 1,..., n), where if R < R i , then the UE can decrease the window size to W i-1 . If R > R i+1 , then the UE can increase the window size to W1. Otherwise, the UE can continue to use the window size W i .

[0137] In some examples, the gNB can use a control message to control the resource selection process. The message can include one, more than one, or all of the following messages. For example, the gNB message can instruct the UE to use random resource selection, partial window awareness resource selection, or partial window awareness with adaptive window size resource selection. For example, the gNB message can instruct the UE to use fixed or adaptive partial window awareness resource selection. For example, the gNB message can instruct the UE to adaptively select to use random resource selection or partial window awareness resource selection. In some examples, the gNB message can provide the parameters for the UE to use in adaptive resource selection, such as the moving interval T, a set of window sizes W i (where i = 0, 1,..., n) and a set of NACK ratios R i (where i = 0, 1,..., n).

[0138] In as ​In the example embodiment shown, the first UE may receive one or more messages including configuration parameters for sidelink operation on the cell. One or more resource pools for sidelink communication may be configured on the cell. The first UE may be configured to adaptively select from multiple sidelink resource allocation / selection processes. Multiple sidelink resource allocation / selection processes may be used by the first UE in sidelink mode 2 operation. Multiple sidelink resource allocation / selection processes may include full-aware resource allocation / selection, partially-aware resource allocation / selection, and random resource selection resource allocation / selection processes. For example, the configuration parameters may include a first parameter indicating that the UE is allowed to select from multiple configured resource allocation / selection processes. In one example, the first UE may transmit a capability message including capability information elements indicating that the UE is capable of adaptively selecting from multiple resource allocation / selection processes, and the UE may receive the first parameter in response to transmitting the capability message.

[0139] A first UE can use a first resource allocation / selection process from multiple resource allocation / selection processes and can determine a first radio resource for transmitting one or more first side-link transport blocks to a second UE. In one example, the first resource allocation / selection process can be one of a full-aware process, a partial-aware process, or a random resource selection process. In one example, the first resource allocation / selection process can be a random resource selection process. The first UE can determine the first radio resource according to mode 2 side-link operation. The first UE can use the determined first radio resource to transmit the one or more side-link transport blocks. In response to transmitting the one or more first side-link transport blocks, the first UE can receive HARQ feedback (HARQ ACK / NACK) associated with the one or more first side-link transport blocks. In one example, the first UE can receive HARQ feedback within a time interval having a duration. In one example, the time interval can be a moving time interval. For example, at a certain moment, the UE can consider one or more HARQ feedbacks received before that moment and received within the time interval. In one example, the duration of the time interval can be predetermined / pre-configured. In one example, the configuration parameters received by the first UE can include parameters indicating the duration of the time interval.

[0140] The first UE can determine whether to switch from the first resource allocation / selection process to the second resource allocation / selection process based on the received HARQ feedback. In one example, the second resource allocation / selection process can be at least one of the following: a full-aware resource allocation / selection process, a partially-aware resource allocation / selection process, or a random resource selection process. In one example, the second resource allocation / selection process can be a partially-aware resource allocation / selection process. In response to switching from the first resource allocation / selection process (random resource selection process) to the second resource allocation / selection process (partial-aware process), the partially-aware (e.g., as...) ​ (As shown) can be a first size. For example, configuration parameters received by the first UE may include parameters indicating the first size. In one example, the first size may have a pre-configured / pre-determined value. The first UE may determine whether to switch from a first resource allocation / selection process to a second resource allocation / selection process based on the ratio / percentage of HARQ NACK to the number of received HARQ feedbacks (e.g., the sum of received HARQ ACKs and HARQ NACKs). For example, HARQ feedback may include a first number of HARQ NACKs and a second number of HARQ ACKs. The first UE may determine whether to switch from a first resource allocation / selection process to a second resource allocation / selection process based on the ratio (first number) / (first number + second number) being greater than or exceeding a first threshold. In one example, configuration parameters received by the first UE may define a first threshold. In one example, the first threshold may have a pre-determined / pre-configured value.

[0141] The first UE can use the second resource allocation / selection procedure and can determine a second radio resource for transmitting one or more second-side crosslink transport blocks. The first UE can transmit one or more second-side crosslink transport blocks based on the determined second radio resource.

[0142] In response to the transmission of the one or more second-side traversal transport blocks, the first UE may receive a second HARQ feedback (HARQ ACK / NACK) associated with the one or more second-side traversal transport blocks. In one example, the first UE may receive the second HARQ feedback over a time interval of duration. In one example, the time interval may be a moving time interval. For example, at a given moment, the UE may consider one or more HARQ feedbacks received before that moment and received within the time interval. In one example, the duration of the time interval may be predetermined / pre-configured. In one example, configuration parameters received by the first UE may define the duration of the time interval.

[0143] In one example, the first UE may determine whether to switch from a partially aware resource allocation / selection process to a random resource selection process based on the ratio of HARQ NACKs to the number of received second HARQ feedbacks (e.g., the sum of received HARQ ACKs and HARQ NACKs). For example, the second HARQ feedback may include a third number of HARQ NACKs and a fourth number of HARQ ACKs. The first UE may determine whether to switch from a partially aware resource allocation / selection process to a random resource selection process based on the ratio (third number) / (third number + fourth number) being less than or less than a second threshold. In one example, configuration parameters received by the first UE may define the second threshold. In one example, the second threshold may have a predetermined / pre-configured value.

[0144] In one example, the first UE may determine to increase the partial sensing window size from the first size to the second size based on a second HARQ feedback. For example, the second HARQ feedback may include a third number of HARQ NACKs and a fourth number of HARQ ACKs. The first UE may determine to increase the partial sensing window size from the first size to the second size based on a ratio (third number) / (third number + fourth number) greater than a third threshold. In one example, the configuration parameters received by the first UE may define the third threshold. In one example, the third threshold may have a predetermined / pre-configured value. In one example, the configuration parameters received by the first UE may define both the first size and the second size.

[0145] In one example, the first UE may determine a first size for maintaining the partial awareness window size based on a second HARQ feedback. For example, the second HARQ feedback may include a third number of HARQNACKs and a fourth number of HARQ ACKs related to the second-side walkway resource allocation process. The first UE may determine to increase the partial awareness window size from the first size to the second size based on a ratio (third number) / (third number + fourth number) greater than a second threshold and less than or equal to a third threshold. In one example, the configuration parameters received by the first UE may include parameters indicating the second and third thresholds. In one example, the second and third thresholds may have predetermined / pre-configured values.

[0146] In one example, the first UE may determine to reduce the partial sensing window size from a first size to a third size based on a second HARQ feedback. For example, the second HARQ feedback may include a third number of HARQ NACKs and a fourth number of HARQ ACKs. The first UE may determine to reduce the partial sensing window size from the first size to the third size based on a ratio (third number) / (third number + fourth number) being less than or less than a fourth threshold. In one example, the configuration parameters received by the first UE may include a parameter indicating the fourth threshold. In one example, the fourth threshold may have a predetermined / pre-configured value. In one example, the configuration parameters received by the first UE may define the first size and the third size.

[0147] In one example, the first UE can receive configuration parameters for the partial sensing resource allocation / selection process and parameters for adjusting the parameters of the partial sensing resource allocation / selection process from the base station. For example, the configuration parameters may indicate multiple values ​​for the partial sensing window size. For example, the configuration parameters may define or specify one or more NACK ratios, where each configuration value of the NACK ratio may correspond to a partial sensing window size.

[0148] In such ​ In the example embodiment shown, the first UE may receive one or more messages including configuration parameters for sidelink operation on the cell. One or more resource pools for sidelink communication may be configured on the cell. The UE may be configured to use a partially aware resource allocation / selection procedure (e.g., in mode 2 sidelink operation). The first UE may be configured with a partially aware resource allocation / selection procedure with an adaptive window size. For example, the first UE may receive configuration parameters including information indicating that the first UE is allowed to use a partially aware resource allocation / selection procedure with an adaptive window size. For example, the first UE may transmit a capability information element in a capability message indicating that the first UE is capable of using a partially aware resource allocation / selection procedure with an adaptive window size. The first UE may use the partially aware resource allocation / selection procedure and may determine a first radio resource for transmitting one or more first sidelink transport blocks. The first UE may use a first window size for the partially aware resource allocation / selection procedure.

[0149] A first UE may transmit one or more first-side cross-link transport blocks based on a determined first radio resource. In response to transmitting the one or more first-side cross-link transport blocks, the first UE may receive HARQ feedback (HARQ ACK / NACK) associated with the one or more first-side cross-link transport blocks. The HARQ feedback may include a first number of NACKs and a second number of ACKs. In one example, the first UE may receive HARQ feedback over a time interval of duration. In one example, the time interval may be a mobile time interval. For example, at a certain moment, the UE may consider one or more HARQ feedbacks received before that moment and received within the time interval. In one example, the duration of the time interval may be predetermined / pre-configured. In one example, configuration parameters received by the first UE may include parameters indicating the duration of the time interval.

[0150] The first UE can determine the NACK ratio as the ratio of a first number of NACKs to the total number of received HARQ feedbacks (e.g., the sum of the first number of NACKs and the second number of ACKs). Depending on the NACK ratio, such as the ratio (first number of NACKs) / (first number of NACKs and second number of ACKs), and by comparing the NACK ratio to one or more thresholds, the first UE can use a partially aware resource allocation / selection with a window size that is more than or greater than, equal to, or less than or smaller than a first window size (e.g., a first window size used to determine the first radio resource). In one example, the first UE can receive configuration parameters indicating one or more thresholds. In one example, the one or more thresholds can have pre-configured / pre-determined values. The first UE can utilize a partially aware resource allocation / selection process with an updated (or maintained) window size to determine a second radio resource. The first UE can transmit one or more second transport blocks based on the determined second radio resource.

[0151] In one embodiment, a first user equipment (UE) may determine a first radio resource for one or more first-side cross-link transport blocks based on a first-side cross-link resource allocation procedure. The first UE may transmit the one or more first-side cross-link transport blocks to a second UE based on the first radio resource. In response to transmitting the one or more first-side cross-link transport blocks, the first UE may receive Hybrid Automatic Repeat Request (HARQ) feedback for the one or more first-side cross-link transport blocks. The first UE may determine, based on the HARQ feedback, whether to switch from the first-side cross-link resource allocation procedure to a second-side cross-link resource allocation procedure. In response to determining to switch from the first-side cross-link resource allocation procedure to the second-side cross-link resource allocation procedure, the first UE may determine a second radio resource for one or more second-side cross-link transport blocks based on the second-side cross-link resource allocation procedure. The first UE may transmit one or more second-side cross-link transport blocks based on the second radio resource.

[0152] In some embodiments, HARQ feedback may include a first number of negative acknowledgments (NACKs) and a second number of positive acknowledgments (ACKs). The first UE may determine to switch from the first-side traversal resource allocation procedure to the second-side traversal resource allocation procedure based on the ratio of the first number of NACKs to the sum of the first number of NACKs and the second number of ACKs being greater than or equal to a first threshold.

[0153] In some embodiments, the first UE may receive configuration parameters that define a first threshold.

[0154] In some embodiments, HARQ feedback can be received within a time window of duration. In some embodiments, the first UE can receive configuration parameters indicating the duration of the time window.

[0155] In some embodiments, the first side link resource allocation process can be at least one of the following: a full-sensing process, a partial-sensing process, and a random resource selection process.

[0156] In some embodiments, the second-side link resource allocation process can be at least one of the following: a full-sensing resource allocation process, a partial-sensing resource allocation process, and a random resource selection resource allocation process.

[0157] In some embodiments, the first resource allocation process may be a random resource selection resource allocation process; the second resource allocation process may be a partially aware resource allocation process. In some embodiments, in response to switching from the random resource selection resource allocation process to the partially aware resource allocation process, the partially aware window size of the partially aware resource allocation process may be a first size. In some embodiments, the first UE may receive configuration parameters defining the first size.

[0158] In some embodiments, in response to transmitting one or more second-side crosslink transport blocks, a first UE may receive a second Hybrid Automatic Repeat Request (HARQ) feedback for the one or more second-side crosslink transport blocks. In some embodiments, the first UE may receive the second HARQ feedback within a time window having a duration. In some embodiments, the first UE may receive configuration parameters defining the duration of the time window. In some embodiments, the first UE may determine, based on the second HARQ feedback, whether to switch from a partially aware resource allocation process to a random resource selection resource allocation process. In some embodiments, the second HARQ feedback may include a third number of negative acknowledgments (NACKs) and a fourth number of positive acknowledgments (ACKs); and the determination to switch from a partially aware resource allocation process to a random resource selection resource allocation process may be based on the ratio of the third number of NACKs to the sum of the third number of NACKs and the fourth number of ACKs being less than or less than a second threshold. In some embodiments, the first UE may receive configuration parameters defining the second threshold.

[0159] In some embodiments, the first UE may determine to increase the partial sensing window size from a first size to a second size based on a second HARQ feedback. In some embodiments, the second HARQ feedback may include a third number of negative acknowledgments (NACKs) and a fourth number of positive acknowledgments (ACKs). Determining to increase the partial sensing window size from the first size to the second size may be based on the ratio of the third number of NACKs to the sum of the third number of NACKs and the fourth number of ACKs being greater than or equal to a third threshold. In some embodiments, the first UE may receive configuration parameters defining the third threshold. In some embodiments, the first UE may receive configuration parameters indicating the first size and the second size.

[0160] In some embodiments, the first UE may determine a first size for maintaining the partial sensing window size based on a second HARQ feedback. In some embodiments, the second HARQ feedback may include a third number of negative acknowledgments (NACKs) and a fourth number of positive acknowledgments (ACKs). The first size for maintaining the partial sensing window size may be determined based on the ratio of the third number of NACKs to the sum of the third number of NACKs and the fourth number of ACKs being greater than a second threshold and less than or less than a third threshold. In some embodiments, the first UE may receive configuration parameters defining the second and third thresholds.

[0161] In some embodiments, the first UE may determine to reduce the partial sensing window size from a first size to a third size based on a second HARQ feedback. In some embodiments, the second HARQ feedback may include a third number of negative acknowledgments (NACKs) and a fourth number of positive acknowledgments (ACKs); and determining to reduce the partial sensing window size from the first size to the third size may be based on the ratio of the third number of NACKs to the sum of the third number of NACKs and the fourth number of ACKs being less than or less than a fourth threshold. In some embodiments, the first UE may receive configuration parameters defining the fourth threshold.

[0162] In some embodiments, the first UE may receive multiple values ​​of the partial sensing window size. The first UE may receive multiple negative acknowledgment (NACK) ratio thresholds, wherein each of the multiple values ​​of the partial sensing window size may correspond to one of the multiple NACK ratio thresholds.

[0163] In some embodiments, the first UE may receive configuration parameters that define the first UE to switch between a first-side traversal resource allocation procedure and a second-side traversal resource allocation procedure.

[0164] In one embodiment, a first UE may determine first radio resources for one or more first-side crosslink transport blocks based on a partially aware resource allocation process associated with a first window size. The first UE may transmit the one or more first-side crosslink transport blocks to a second UE based on the first radio resources. In response to transmitting the one or more first transport blocks, the first UE may receive Hybrid Automatic Repeat Request (HARQ) feedback for the one or more first-side crosslink transport blocks, wherein the HARQ feedback may include a first number of negative acknowledgments (NACKs) and a second number of positive acknowledgments (ACKs). The first UE may determine a NACK ratio based on the ratio of the first number of NACKs to the sum of the first number of NACKs and the second number of ACKs. The first UE may determine second radio resources for one or more second-side crosslink transport blocks based on a partially aware resource allocation process associated with a second window size, wherein the second window size may be greater than, less than, or equal to the first window size based on comparing the NACK ratio to one or more thresholds. The first UE may transmit the one or more second-side crosslink transport blocks based on the second radio resources.

[0165] In some embodiments, the first UE may receive configuration parameters that define one or more thresholds.

[0166] In some embodiments, Hybrid Automatic Repeat Request (HARQ) feedback can be received within a time window of duration. In some embodiments, the first UE can receive configuration parameters defining the duration of the time window.

[0167] In some embodiments, the first UE may receive configuration parameters that include information that allows the first UE to adaptively change the window size of a partial sensing resource selection process.

[0168] The exemplary blocks and modules described in this disclosure with respect to various example embodiments may be implemented or performed using a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. Examples of general-purpose processors include, but are not limited to, microprocessors, any conventional processor, controllers, microcontrollers, or state machines. In some examples, a processor may be implemented using a combination of devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors combined with a DSP core, or any other such configuration).

[0169] The functions described in this disclosure can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. Instructions or code can be stored or transmitted on a computer-readable medium for implementing these functions. Other examples of implementing the functions disclosed herein are also within the scope of this disclosure. Implementation of functions can be via physically co-located or distributed elements (e.g., in different locations), including distributions such that partial functions are implemented in different physical locations.

[0170] Computer-readable media include, but are not limited to, non-transitory computer storage media. Non-transitory storage media can be accessed by a general-purpose or special-purpose computer. Examples of non-transitory storage media include, but are not limited to, random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage, or other magnetic storage devices. Non-transitory media can be used to carry or store desired program code means (e.g., instructions and / or data structures) and can be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor. In some examples, software / program code can be transmitted from a remote source (e.g., a website, server, etc.) using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave. In such examples, coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are within the scope of the media definition. The combinations of the above examples are also within the scope of computer-readable media.

[0171] As used in this disclosure, the use of the term "or" in a list of items indicates a comprehensive list. A list of items may be prefixed with phrases such as "at least one" or "one or more." For example, a list of at least one of A, B, or C includes A or B or C or AB (i.e., A and B) or AC or BC or ABC (i.e., A and B and C). Furthermore, as used in this disclosure, a list of conditions prefixed with the phrase "based on" should not be interpreted as "based only on" the set of conditions, but rather as "at least partially based on" the set of conditions. For example, a result described as "based on condition A" may be based on both condition A and condition B without departing from the scope of this disclosure.

[0172] In this specification, the terms "comprising," "containing," or "including" are used interchangeably and have the same meaning, and are interpreted as inclusive and open-ended. The terms "comprising," "containing," or "including" may precede a list of elements and indicate that at least all listed elements are present, but other elements not listed may also be present. For example, if A includes B and C, then {B, C} and {B, C, D} are both within the scope of A.

[0173] With reference to the accompanying drawings, this disclosure describes example configurations that do not represent all possible examples or all configurations within the scope of this disclosure. The term "exemplary" should not be construed as "preferred" or "advantageous compared to other examples," but rather as "illustrative, example, or illustration." By reading this disclosure, including the description of embodiments and accompanying drawings, those skilled in the art will understand that alternative embodiments can be used to implement the techniques disclosed herein. Those skilled in the art will appreciate that the embodiments described herein or certain features of the embodiments can be combined to obtain other embodiments for practicing the techniques described in this disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but should be accorded the broadest scope consistent with the principles and novel features disclosed herein.

[0174] Clause 1. Sidelink resource selection method, including:

[0175] The first user equipment (UE) determines the first radio resources for one or more first-side cross-link transport blocks based on the first-side cross-link resource allocation procedure;

[0176] The first UE transmits one or more first-side cross-link transport blocks to the second UE based on the first radio resources;

[0177] The first UE receives a first Hybrid Automatic Repeat Request (HARQ) feedback for the one or more first-side cross-link transport blocks;

[0178] The first UE determines whether to switch from the first-side link resource allocation process to the second-side link resource allocation process based on the HARQ feedback.

[0179] In response to determining the handover to the second-side crosslink resource allocation procedure, the first UE determines, based on the second-side crosslink resource allocation procedure, a second radio resource for one or more second-side crosslink transport blocks; and

[0180] The first UE transmits the one or more second-side crosslink transport blocks based on the second radio resources.

[0181] Clause 2. The method as described in Clause 1, wherein the HARQ feedback is based on a first number of negative acknowledgments (NACKs) and a second number of positive acknowledgments (ACKs), wherein determining whether to switch from the first-side link resource allocation process to the second-side link resource allocation process is based on whether the ratio of the first number of NACKs to the second number of ACKs is greater than a first threshold.

[0182] Clause 3. The method as described in Clause 2, wherein the ratio corresponds to the ratio of the first number of NACKs to the sum of the first number of NACKs and the second number of ACKs.

[0183] Clause 4. The method as described in Clause 2 further includes receiving configuration parameters, wherein the received configuration parameters define the first threshold.

[0184] Clause 5. The method as described in Clause 1, wherein receiving the HARQ feedback includes receiving the HARQ feedback within a first time window.

[0185] Clause 6. The method as described in Clause 5 further includes receiving configuration parameters, wherein the received configuration parameters define the duration of the first time window.

[0186] Clause 7. The method as described in Clause 1, wherein the first side link resource allocation process corresponds to at least one of a full sensing process, a partial sensing process, and a random resource selection process.

[0187] Clause 8. The method as described in Clause 1, wherein the second-side link resource allocation process is one of a partially sensed resource allocation process and a random resource selection resource allocation process.

[0188] Clause 9. As described in Clause 1, wherein:

[0189] The first side link resource allocation process is a random resource selection resource allocation process; and

[0190] The second-side link resource allocation process is a partially sensing resource allocation process.

[0191] Clause 10. The method as described in Clause 9, wherein the partial sensing window size of the partial sensing resource allocation process corresponds to a first size.

[0192] Clause 11. The method as described in Clause 10 further includes the first UE receiving configuration parameters indicating the first size.

[0193] Clause 12. The method as described in Clause 9 further includes receiving, by the first UE, a second HARQ feedback relating to the transmission of the one or more second-side crosslink transport blocks.

[0194] Clause 13. The method as described in Clause 12, wherein receiving the second HARQ feedback by the first UE includes receiving the second HARQ feedback within a second time window.

[0195] Clause 14. The method of Clause 13 further includes receiving configuration parameters, wherein the received configuration parameters define the duration of the second time window.

[0196] Clause 15. The method as described in Clause 12 further includes determining, based on the second HARQ feedback, to switch to the random resource selection resource allocation process.

[0197] Clause 16. The method as described in Clause 15, wherein the second HARQ feedback is based on a third number of NACKs and a fourth number of ACKs, the method further comprising determining, by the first UE, whether the ratio of the third number of NACKs to the sum of the third number of NACKs and the fourth number of ACKs is less than a second threshold, to switch to the random resource selection resource allocation process.

[0198] Clause 17. The method of Clause 16 further includes receiving configuration parameters, wherein the received configuration parameters define the second threshold.

[0199] Clause 18. The method of Clause 12 further includes the first UE determining, based on the second HARQ feedback, to increase the size of the partial perception window.

[0200] Clause 19. The method of Clause 18, wherein the second HARQ feedback is based on a third number of NACKs and a fourth number of ACKs, the method further comprising determining to increase the size of the partial perception window based on the ratio of the third number of NACKs to the sum of the third number of NACKs and the fourth number of ACKs being greater than a third threshold.

[0201] Clause 20. The method of Clause 19 further includes receiving configuration parameters, wherein the received configuration parameters define the third threshold.

[0202] Clause 21. The method of Clause 19, wherein determining to increase the size of the partial sensing window includes determining to increase the size of the partial sensing window to a second size, the method further comprising receiving configuration parameters, wherein the received configuration parameters define the second size.

[0203] Clause 22. The method as described in Clause 12, wherein the switching to the partially perceptual resource allocation process includes defining a first size for the partially perceptual window of the partially perceptual resource allocation process; and

[0204] It also includes determining the first size that maintains the partial perception window size based on the feedback from the second Hybrid Automatic Repeat Request (HARQ).

[0205] Clause 23. The method of Clause 22, wherein the second HARQ feedback is based on a third number of NACKs and a fourth number of ACKs, the method further comprising determining, by the first UE, whether the ratio of the third number of NACKs to the sum of the third number of NACKs and the fourth number of ACKs is greater than a second threshold and less than a third threshold, the first size for maintaining the partial perception window size.

[0206] Clause 24. The method of Clause 22 further includes receiving configuration parameters by the first UE, wherein the received configuration parameters define the second threshold and the third threshold.

[0207] Clause 25. The method of Clause 22 further includes the first UE determining, based on the feedback of the second Hybrid Automatic Repeat Request (HARQ), to reduce the size of the partial sensing window from the first size to the third size.

[0208] Clause 26. The method of Clause 25, wherein the second HARQ feedback is based on a third number of NACKs and a fourth number of ACKs, the method further comprising determining, based on whether the ratio of the third number of NACKs to the sum of the third number of NACKs and the fourth number of ACKs is less than a fourth threshold, to reduce the partial perception window size.

[0209] Clause 27. The method of Clause 26 further includes receiving configuration parameters, wherein the received configuration parameters define the fourth threshold.

[0210] Clause 28. The method described in Clause 1 further includes:

[0211] Receive multiple values ​​for the partial sensing window size in the partial sensing resource allocation process; and

[0212] Receive multiple NACK ratio thresholds; wherein each NACK ratio threshold is associated with the multiple values ​​of the partial sensing window size.

[0213] Clause 29. The method of Clause 1 further includes receiving configuration parameters, wherein the received configuration parameters include information indicating that the first UE is permitted to switch between the first side traversal resource allocation procedure and the second side traversal resource allocation procedure.

[0214] Clause 30. Sidelink resource selection method, including the following steps:

[0215] The first user equipment (UE) determines the first radio resources for one or more first side link transport blocks based on a partially sensed resource allocation process associated with the first window size;

[0216] The first UE transmits one or more first-side cross-link transport blocks to the second UE based on the first radio resources;

[0217] The first UE receives Hybrid Automatic Repeat Request (HARQ) feedback for the one or more first-side cross-link transport blocks, wherein the HARQ feedback is based on a first number of negative acknowledgments (NACK) and a second number of positive acknowledgments (ACK).

[0218] The first UE identifies the NACK ratio of the first number of NACKs to the sum of the first number of NACKs and the second number of ACKs;

[0219] The first UE determines second radio resources for one or more second-side crosslink transport blocks based on the partially sensed resource allocation process associated with the second window size, wherein the second window size is greater than, less than, or equal to the first window size based on comparing the NACK ratio with one or more thresholds; and

[0220] The first UE transmits the one or more second-side crosslink transport blocks based on the second radio resources.

[0221] Clause 31. The method as described in Clause 30 further receives configuration parameters, wherein the received configuration parameters define the one or more thresholds.

[0222] Clause 32. The method as described in Clause 30, wherein receiving the HARQ feedback for the one or more first-side crosslink transport blocks includes receiving the HARQ feedback within a time window.

[0223] Clause 33. The method of Clause 32 further includes receiving configuration parameters, wherein the received configuration parameters define an indication of the duration of the time window.

[0224] Clause 34. The method of Clause 30 further includes receiving configuration parameters, wherein the received configuration parameters include information indicating that the first user equipment (UE) is allowed to adaptively change the window size of the partial sensing resource selection process.

[0225] Clause 35. A device for use in wireless communication, comprising:

[0226] An antenna, used to transmit electromagnetic signals;

[0227] Memory, which is used to hold computer-readable code; and

[0228] A processor for executing the computer-readable code, the computer-readable code causing the device to:

[0229] Based on the first-side cross-link resource allocation process, a first radio resource for one or more first-side cross-link transport blocks is determined.

[0230] Based on the first radio resource, transmit the one or more first-side cross-link transport blocks;

[0231] Receive a first Hybrid Automatic Repeat Request (HARQ) response for the one or more first-side crosslink transport blocks;

[0232] Based on the HARQ feedback, determine whether to switch from the first-side traverse resource allocation process to the second-side traverse resource allocation process;

[0233] In response to determining the switch to the second-side crosslink resource allocation procedure, a second radio resource for one or more second-side crosslink transport blocks is determined based on the second-side crosslink resource allocation procedure; and

[0234] Based on the second radio resource, the one or more second-side cross-link transport blocks are transmitted.

[0235] Clause 36. The apparatus of Clause 35, wherein the HARQ feedback is based on a first number of negative acknowledgments (NACKs) and a second number of positive acknowledgments (ACKs), wherein determining whether to switch from the first-side traversal resource allocation procedure to the second-side traversal resource allocation procedure is based on whether the ratio of the first number of NACKs to the second number of ACKs is greater than a first threshold.

[0236] Clause 37. The apparatus as described in Clause 36, wherein the ratio corresponds to the ratio of the first number of NACKs to the sum of the first number of NACKs and the second number of ACKs.

[0237] Clause 38. The apparatus as described in Clause 36, wherein the apparatus receives configuration parameters, wherein the received configuration parameters define the first threshold.

[0238] Clause 39. The apparatus as described in Clause 35, wherein receiving the HARQ feedback includes receiving the HARQ feedback within a first time window.

[0239] Clause 40. The apparatus as described in Clause 39, wherein the apparatus receives configuration parameters, wherein the received configuration parameters define the duration of the first time window.

[0240] Clause 41. The apparatus as described in Clause 35, wherein the first side link resource allocation process corresponds to at least one of a full sensing process, a partial sensing process, and a random resource selection process.

[0241] Clause 42. The apparatus as described in Clause 35, wherein the second-side link resource allocation process is one of a partially sensed resource allocation process and a random resource selection resource allocation process.

[0242] Clause 43. The apparatus as described in Clause 35, wherein:

[0243] The first side link resource allocation process is a random resource selection resource allocation process; and

[0244] The second-side link resource allocation process is a partially sensing resource allocation process.

[0245] Clause 44. The apparatus as described in Clause 43, wherein the partial sensing window size of the partial sensing resource allocation process corresponds to a first size.

[0246] Clause 45. The apparatus as described in Clause 44, wherein the apparatus receives configuration parameters indicating the first size.

[0247] Clause 46. The apparatus as described in Clause 43, wherein the apparatus receives a second HARQ feedback relating to the transmission of the one or more second-side cross-link transport blocks.

[0248] Clause 47. The apparatus as described in Clause 46, wherein receiving the second HARQ feedback includes receiving the second HARQ feedback within a second time window.

[0249] Clause 48. The apparatus as described in Clause 46, wherein the apparatus receives configuration parameters, wherein the received configuration parameters define the duration of the second time window.

[0250] Clause 49. The apparatus as described in Clause 46, wherein the apparatus determines to switch to the random resource selection resource allocation process based on the second HARQ feedback.

[0251] Clause 50. The apparatus of Clause 49, wherein the second HARQ feedback is based on a third number of NACKs and a fourth number of ACKs, the apparatus further comprising determining, by the first UE, whether the ratio of the third number of NACKs to the sum of the third number of NACKs and the fourth number of ACKs is less than a second threshold, to switch to the random resource selection resource allocation process.

[0252] Clause 51. The apparatus as described in Clause 50, wherein the apparatus receives configuration parameters, wherein the received configuration parameters define the second threshold.

[0253] Clause 52. The apparatus as described in Clause 46 further includes a determination by the first UE, based on the second HARQ feedback, to increase the size of the partial sensing window.

[0254] Clause 53. The apparatus of Clause 52, wherein the second HARQ feedback is based on a third number of NACKs and a fourth number of ACKs, the apparatus further comprising determining to increase the size of the partial sensing window based on the ratio of the third number of NACKs to the sum of the third number of NACKs and the fourth number of ACKs being greater than a third threshold.

[0255] Clause 54. The apparatus as described in Clause 53, wherein the apparatus receives configuration parameters, wherein the received configuration parameters define the third threshold.

[0256] Clause 55. The apparatus of Clause 53, wherein determining to increase the size of the partial sensing window includes determining to increase the size of the partial sensing window to a second size, wherein the apparatus receives configuration parameters, wherein the received configuration parameters define the second size.

[0257] Clause 56. The apparatus as described in Clause 46, wherein the switching to the partial sensing resource allocation process includes defining a first size for the partial sensing window of the partial sensing resource allocation process; and

[0258] It also includes determining the first size that maintains the partial perception window size based on the feedback from the second Hybrid Automatic Repeat Request (HARQ).

[0259] Clause 57. The apparatus of Clause 56, wherein the second HARQ feedback is based on a third number of NACKs and a fourth number of ACKs, the apparatus further comprising determining, by the first UE, whether the ratio of the third number of NACKs to the sum of the third number of NACKs and the fourth number of ACKs is greater than a second threshold and less than a third threshold, the first size for maintaining the partial sensing window size.

[0260] Clause 58. The apparatus as described in Clause 56, wherein the apparatus receives configuration parameters, wherein the received configuration parameters define the second threshold and the third threshold.

[0261] Clause 59. The apparatus as described in Clause 56, wherein the apparatus determines, based on the second Hybrid Automatic Repeat Request (HARQ) feedback, to reduce the size of the partial sensing window from the first size to the third size.

[0262] Clause 60. The apparatus of Clause 59, wherein the second HARQ feedback is based on a third number of NACKs and a fourth number of ACKs, the apparatus further comprising determining, by the first UE, whether the ratio of the third number of NACKs to the sum of the third number of NACKs and the fourth number of ACKs is less than a fourth threshold, to reduce the partial sensing window size.

[0263] Clause 61. The apparatus as described in Clause 60, wherein the apparatus receives configuration parameters, wherein the received configuration parameters define the fourth threshold.

[0264] Clause 62. The apparatus as described in Clause 35, wherein the apparatus:

[0265] Receive multiple values ​​for the partial sensing window size in the partial sensing resource allocation process; and

[0266] Receive multiple NACK ratio thresholds; wherein each NACK ratio threshold is associated with the multiple values ​​of the partial sensing window size.

[0267] Clause 63. The apparatus as described in Clause 35, wherein the apparatus receives configuration parameters, wherein the received configuration parameters include information indicating that the first UE is permitted to switch between the first side-link resource allocation procedure and the second side-link resource allocation procedure.

[0268] Clause 64. A device for use in wireless communication, comprising:

[0269] An antenna, used to transmit electromagnetic signals;

[0270] Memory, which is used to hold computer-readable code; and

[0271] A processor for executing the computer-readable code, the computer-readable code causing the device to:

[0272] Based on a partially sensed resource allocation process associated with the first window size, first radio resources for one or more first side cross link transport blocks are determined.

[0273] Based on the first radio resource, transmit the one or more first-side cross-link transport blocks;

[0274] Receive Hybrid Automatic Repeat Request (HARQ) feedback for the one or more first-side crosslink transport blocks, wherein the HARQ feedback is based on a first number of negative acknowledgments (NACK) and a second number of positive acknowledgments (ACK);

[0275] Identify the NACK ratio of the first number of NACKs to the sum of the first number of NACKs and the second number of ACKs;

[0276] Based on the partially sensed resource allocation process associated with the second window size, second radio resources for one or more second-side crosslink transport blocks are determined, wherein the second window size is greater than, less than, or equal to the first window size based on comparing the NACK ratio with one or more thresholds; and

[0277] Based on the second radio resource, the one or more second-side cross-link transport blocks are transmitted.

[0278] Clause 65. The apparatus as described in Clause 64, wherein the apparatus receives configuration parameters, wherein the received configuration parameters define the one or more thresholds.

[0279] Clause 66. The apparatus as described in Clause 64, wherein receiving the HARQ feedback for the one or more first-side cross-link transport blocks includes receiving the HARQ feedback within a time window.

[0280] Clause 67. The apparatus as described in Clause 66, wherein the apparatus receives configuration parameters, wherein the received configuration parameters define an indication of the duration of the time window.

[0281] Clause 68. The apparatus as described in Clause 64, wherein the apparatus receives configuration parameters, wherein the received configuration parameters include information indicating that the first user equipment (UE) is allowed to adaptively change the window size of the partial sensing resource selection process.

[0282] Clause 69. Sidelink resource selection methods, including:

[0283] The second user equipment (UE) receives one or more first-side cross-link transport blocks from the first UE based on a first radio resource, wherein the first radio resource is determined based on a first-side cross-link resource allocation process;

[0284] The second UE transmits a first Hybrid Automatic Repeat Request (HARQ) feedback to the first UE for the one or more first-side cross-link transport blocks;

[0285] In response to determining a switch from the first-side crosslink resource allocation procedure to the second-side crosslink resource allocation procedure based on the HARQ feedback, the first UE receives one or more second-side crosslink transport blocks based on second radio resources, which are determined based on the second-side crosslink resource allocation procedure.

[0286] Clause 70. Sidelink resource selection methods, including:

[0287] The second user equipment (UE) receives one or more first-side cross-link transport blocks from the first UE based on a first radio resource, the first radio resource being determined based on a partially sensed resource allocation process associated with a first window size;

[0288] The second UE transmits a Hybrid Automatic Repeat Request (HARQ) feedback for the one or more first-side cross-link transport blocks to the first UE, wherein the HARQ feedback is based on a first number of negative acknowledgments (NACK) and a second number of positive acknowledgments (ACK).

[0289] In response to a partial sensing resource allocation process associated with a second window size, a second radio resource is determined for one or more second-side crosslink transport blocks, and the second UE receives the one or more second-side crosslink transport blocks from the first UE based on the second radio resource, wherein the second window size is greater than, less than or equal to the first window size based on comparing the NACK ratio with one or more thresholds, and wherein the NACK ratio is the ratio of the first number of NACKs to the sum of the first number of NACKs and the second number of ACKs.

[0290] This application claims the benefit of U.S. Provisional Application No. 63 / 091,737, filed October 12, 2020, entitled “POWER SAVING ENHANCEMENT FORSIDELINK”. U.S. Provisional Application No. 63 / 091,737 is incorporated herein by reference.

Claims

1. Sidelink resource selection methods, including: The first user equipment (UE) determines the first radio resources for one or more first-side cross-link transport blocks based on the first-side cross-link resource allocation process and according to the mode 2 side cross-link operation. The first UE transmits one or more first-side cross-link transport blocks to the second UE based on the first radio resources; The first UE receives a first Hybrid Automatic Repeat Request (HARQ) feedback for the one or more first-side cross-link transport blocks; The first UE determines whether to switch from the first-side link resource allocation process to the second-side link resource allocation process based on the HARQ feedback. In response to determining the switch to the second-side crosslink resource allocation procedure, the first UE determines the second radio resources for one or more second-side crosslink transport blocks based on the second-side crosslink resource allocation procedure and according to the mode 2 crosslink operation. as well as The first UE transmits the one or more second-side crosslink transport blocks based on the second radio resources.

2. The method as described in claim 1, wherein, The HARQ feedback is based on a first number of negative acknowledgments (NACKs) and a second number of positive acknowledgments (ACKs). The determination of whether to switch from the first-side link resource allocation process to the second-side link resource allocation process is based on whether the ratio of the first number of NACKs to the second number of ACKs is greater than a first threshold.

3. The method as described in claim 2, wherein, The ratio corresponds to the ratio of the first number of NACKs to the sum of the first number of NACKs and the second number of ACKs.

4. The method of claim 2, further comprising receiving configuration parameters, wherein, The received configuration parameters define the first threshold.

5. The method of claim 1, wherein, Receiving the HARQ feedback includes receiving the HARQ feedback within a first time window.

6. The method of claim 5, further comprising receiving configuration parameters, wherein, The received configuration parameters define the duration of the first time window.

7. The method of claim 1, wherein, The first side link resource allocation process corresponds to at least one of a full sensing process, a partial sensing process, and a random resource selection process.

8. The method of claim 1, wherein, The second side link resource allocation process is one of the partially sensed resource allocation process and the random resource selection resource allocation process.

9. The method of claim 1, wherein: The first side link resource allocation process is a random resource selection resource allocation process; and The second-side link resource allocation process is a partially sensing resource allocation process.

10. The method of claim 9, wherein, The partial sensing window size of the partial sensing resource allocation process corresponds to the first size.

11. The method of claim 10, further comprising the first UE receiving configuration parameters defining the first size.

12. The method of claim 9, further comprising receiving, by the first UE, a second HARQ feedback relating to the transmission of the one or more second-side cross-link transport blocks.

13. The method of claim 12, wherein, Receiving the second HARQ feedback by the first UE includes receiving the second HARQ feedback within a second time window.

14. The method of claim 13, further comprising receiving configuration parameters, wherein, The received configuration parameters define the duration of the second time window.

15. The method of claim 12, further comprising determining, based on the second HARQ feedback, to switch to the random resource selection resource allocation process.

16. The method of claim 15, wherein, The second HARQ feedback is based on a third number of NACKs and a fourth number of ACKs. The method further includes determining whether the first UE will switch to the random resource selection resource allocation process based on whether the ratio of the third number of NACKs to the sum of the third number of NACKs and the fourth number of ACKs is less than a second threshold.

17. The method of claim 16, further comprising receiving configuration parameters, wherein, The received configuration parameters define the second threshold.

18. The method of claim 12, further comprising the first UE determining, based on the second HARQ feedback, to increase the size of the partial sensing window.

19. The method of claim 18, wherein, The second HARQ feedback is based on a third number of NACKs and a fourth number of ACKs. The method further includes determining to increase the size of the partial perception window based on the ratio of the third number of NACKs to the sum of the third number of NACKs and the fourth number of ACKs being greater than a third threshold.

20. The method of claim 19, further comprising receiving configuration parameters, wherein, The received configuration parameters define the third threshold.

21. The method of claim 19, wherein, Determining to increase the size of the partial sensing window includes determining to increase the size of the partial sensing window to a second size, and the method further includes receiving configuration parameters, wherein the received configuration parameters define the second size.

22. The method of claim 12, wherein, The switching to the partial sensing resource allocation process includes defining a first size for the partial sensing window size of the partial sensing resource allocation process; and It also includes determining the first size that maintains the partial perception window size based on the second hybrid automatic repeat request HARQ feedback.

23. The method of claim 22, wherein, The second HARQ feedback is based on a third number of NACKs and a fourth number of ACKs. The method further includes determining the first size of maintaining the partial perception window size based on whether the ratio of the third number of NACKs to the sum of the third number of NACKs and the fourth number of ACKs is greater than a second threshold and less than a third threshold.

24. The method of claim 23, further comprising receiving configuration parameters by the first UE, wherein, The received configuration parameters define the second threshold and the third threshold.

25. The method of claim 22, further comprising the first UE determining, based on the second Hybrid Automatic Repeat Request (HARQ) feedback, to reduce the partial perception window size from the first size to a third size.

26. The method of claim 25, wherein, The second HARQ feedback is based on a third number of NACKs and a fourth number of ACKs. The method further includes determining whether the first UE reduces the partial perception window size based on whether the ratio of the third number of NACKs to the sum of the third number of NACKs and the fourth number of ACKs is less than a fourth threshold.

27. The method of claim 26, further comprising receiving configuration parameters, wherein, The received configuration parameters define the fourth threshold.

28. The method of claim 1, further comprising: Receive multiple values ​​for the partial sensing window size, which is a partial sensing resource allocation process that is at least one of the first-side cross-link resource allocation process and the second-side cross-link resource allocation process. as well as Receive multiple NACK ratio thresholds; wherein each NACK ratio threshold is associated with the multiple values ​​of the partial sensing window size.

29. The method of claim 1, further comprising receiving configuration parameters, wherein, The received configuration parameters include information indicating that the first UE is allowed to switch between the first side traversal resource allocation procedure and the second side traversal resource allocation procedure.

30. Sidelink resource selection methods, including: The first user equipment (UE) determines the first radio resources for one or more first-side cross-link transport blocks based on a partial sensing resource allocation process associated with the first window size, according to the mode 2 side cross-link operation. The first UE transmits one or more first-side cross-link transport blocks to the second UE based on the first radio resources; The first UE receives Hybrid Automatic Repeat Request (HARQ) feedback for the one or more first-side cross-link transport blocks, wherein the HARQ feedback is based on a first number of negative acknowledgments (NACKs) and a second number of positive acknowledgments (ACKs). The first UE identifies the NACK ratio of the first number of NACKs to the sum of the first number of NACKs and the second number of ACKs; Based on the partial sensing resource allocation process associated with the second window size, the first UE determines second radio resources for one or more second-side crosslink transport blocks according to mode 2 side crosslink operation, wherein the second window size is greater than, less than, or equal to the first window size based on comparing the NACK ratio with one or more thresholds; and The first UE transmits the one or more second-side crosslink transport blocks based on the second radio resources.

31. The method of claim 30, further receiving configuration parameters, wherein, The received configuration parameters define one or more thresholds.

32. The method of claim 30, wherein, Receiving the HARQ feedback for the one or more first-side crosslink transport blocks includes receiving the HARQ feedback within a time window.

33. The method of claim 32, further comprising receiving configuration parameters, wherein, The received configuration parameters define the duration of the time window.

34. The method of claim 30, further comprising receiving configuration parameters, wherein, The received configuration parameters include information indicating that the first user equipment (UE) is allowed to adaptively change the window size of the partial sensing resource selection process.

35. Sidelink resource selection methods, including: The second user equipment (UE) receives one or more first-side cross-link transport blocks from the first UE based on the first radio resources, wherein the first radio resources are determined according to the mode 2 cross-link operation based on the first-side cross-link resource allocation process. The second UE transmits a first Hybrid Automatic Repeat Request (HARQ) feedback to the first UE for the one or more first-side cross-link transport blocks. In response to determining a switch from the first-side crosslink resource allocation procedure to the second-side crosslink resource allocation procedure based on the HARQ feedback, the first UE receives one or more second-side crosslink transport blocks based on second radio resources, which are determined according to mode 2 crosslink operation based on the second-side crosslink resource allocation procedure.

36. Sidelink resource selection methods, including: The second user equipment (UE) receives one or more first-side cross-link transport blocks from the first UE based on a first radio resource, wherein the first radio resource is determined based on a partial sensing resource allocation process associated with a first window size according to mode 2 side cross-link operation; The second UE transmits a Hybrid Automatic Repeat Request (HARQ) feedback for the one or more first-side cross-link transport blocks to the first UE, wherein the HARQ feedback is based on a first number of negative acknowledgments (NACKs) and a second number of positive acknowledgments (ACKs). In response to a partial sensing resource allocation process associated with a second window size, a second radio resource is determined for one or more second-side crosslink transport blocks according to mode 2 side crosslink operation. The second UE receives the one or more second-side crosslink transport blocks from the first UE based on the second radio resource. The second window size is greater than, less than, or equal to the first window size based on comparing the NACK ratio with one or more thresholds. The NACK ratio is the ratio of the first number of NACKs to the sum of the first number of NACKs and the second number of ACKs.

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