Configuration of sidelink transmissions

Abstract

Aspects of the present disclosure relate to methods, apparatuses, and systems for supporting configuration of sidelink transmissions. For example, the present disclosure describes a method for determining a sidelink transmission offset according to a sidelink transmission priority. For example, a sidelink transmission offset may be determined as a positive offset value from a symbol boundary time and / or a negative offset value from the symbol boundary time.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Provisional Application Serial No. 63 / 409,949, filed on September 26, 2022, entitled “CONFIGURATION OF SIDELINK TRANSMISSION,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to wireless communications, and more particularly to sidelink transmissions in wireless communications. Background Art

[0004] A wireless communication system may include one or more network communication devices (such as base stations), which may be referred to as eNodeB (eNB), next generation NodeB (gNB) or other suitable terms. Each network communication device (such as a base station) may support wireless communication of one or more user communication devices, which may also be referred to as user equipment (UE) or other suitable terms. A wireless communication system may support wireless communication with one or more user communication devices by utilizing resources of a wireless communication system (e.g., time resources (e.g., symbols, time slots, subframes, frames, etc.) or frequency resources (e.g., subcarriers, carriers)). In addition, a wireless communication system may support wireless communication across various radio access technologies, including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) radio access technology, and other suitable radio access technologies beyond 5G (e.g., sixth generation (6G)).

[0005] Some wireless communication systems provide techniques for sidelink transmissions on unlicensed carrier frequencies. However, these techniques may not take into account transmission priorities for sidelink transmissions. Summary of the invention

[0006] The present disclosure relates to methods, apparatus and systems for supporting configuration of sidelink transmissions. For example, the present disclosure describes a method for determining a sidelink transmission offset based on a sidelink transmission priority. For example, the sidelink transmission offset can be determined as a positive offset value from a symbol boundary time and / or a negative offset value from a symbol boundary time.

[0007] By utilizing the above-described techniques, sidelink frequency resources (eg, in an unlicensed spectrum) may be utilized more efficiently while reducing signal interference in such sidelink frequency resources.

[0008] Some implementations of the methods and devices described herein may also include generating a transmission at a first device; and sending the transmission by the first device via a sidelink resource at a first moment, the first moment being determined based on a symbol boundary moment and a first start transmission time offset, and the first start transmission time offset being determined at least in part based on a first transmission priority for the transmission.

[0009] Some implementations of the methods and devices described herein may also include where the sidelink resources appear in an unlicensed spectrum; the symbol boundaries include time slot boundaries; the first start transmission time offset for the first transmission priority is less than the second transmission time offset for the second transmission priority, and where the first transmission priority is higher than the second transmission priority; also includes determining whether the sidelink resources are reserved by a second device; and determining the first start transmission time offset to a non-zero value based at least in part on the determination that the sidelink resources are reserved by a different device; also includes determining whether the first transmission priority exceeds a transmission priority threshold; and determining the first start transmission time offset to a non-zero value based at least in part on the determination that the first transmission priority exceeds the transmission priority threshold.

[0010] Some implementations of the methods and devices described herein may also include using a cyclic prefix extension to implement the first start transmission time offset when the first start transmission time offset has a negative value; also include performing a clear channel assessment on the sidelink resource before sending a transmission through the sidelink resource; also include determining a first transmission priority based at least in part on a resource pool for the sidelink resource; also include sending a transmission through the sidelink resource at a first moment based at least in part on a failure of the clear channel assessment at a second moment and a success of the clear channel assessment at the first moment; also include determining that the first moment occurs before a symbol boundary moment; and also include receiving a notification from a second device to apply the first start transmission time offset based at least in part on the first transmission priority.

[0011] Some implementations of the methods and devices described herein may also include generating a notification by a first device, the notification comprising one or more transmission priorities for sidelink transmissions and one or more transmission time offsets to be applied to one or more sidelink transmissions associated with the one or more transmission priorities; and sending the notification to a second device.

[0012] Some implementations of the methods and devices described herein may also include a notification indicating that one or more transmission priorities and one or more transmission time offsets are to be applied to one or more sidelink transmissions on an unlicensed spectrum; the notification includes a first transmission priority associated with a first transmission time offset and a second transmission priority associated with a second transmission time offset; the first transmission priority is higher than the second transmission priority; and the first transmission time offset is less than the second transmission time offset; the notification also includes an indication of the following items: when the sidelink resources for the sidelink transmission are determined to be reserved by the third device, the second device determines the transmission time offset to be a non-zero value.

[0013] Some implementations of the methods and apparatus described herein may also include, wherein the notification also includes an indication of the following items: when the transmission priority exceeds a transmission priority threshold, the second device determines the transmission time offset as a non-zero value; the notification also includes an indication for using a cyclic prefix extension to implement at least one transmission time offset; in some aspects, the technology described herein relates to a method, wherein the notification also includes an indication of an association of one or more transmission priorities with a resource pool for sidelink transmissions; the notification also includes an indication that at least one transmission time offset is applicable to determining a time moment occurring before a symbol boundary time moment of the sidelink transmission; and also includes sending the notification via radio resource control (RRC) signaling. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 An example of a wireless communication system configured to support sidelink transmissions in accordance with aspects of the present disclosure is illustrated.

[0015] Figure 2 An Orthogonal Frequency Division Multiplexing (OFDM) symbol is illustrated with a cyclic prefix added, such as to mitigate inter-symbol interference.

[0016] Figure 3 An OFDM symbol is illustrated with a cyclic prefix added, such as to mitigate inter-symbol interference in unlicensed carriers.

[0017] Figure 4 Illustrated are scenarios in which a sidelink UE may start transmitting before the start of a symbol boundary in accordance with aspects of the present disclosure.

[0018] Figure 5 A scenario is illustrated in which a sidelink (SL) transmission may start after a symbol boundary in accordance with aspects of the present disclosure.

[0019] Figure 6 A scenario in which SL transmission starts before a symbol boundary according to aspects of the present disclosure is illustrated.

[0020] Figure 7 and Figure 8An example of a block diagram of a device supporting configuration of sidelink transmissions in accordance with aspects of the present disclosure is illustrated.

[0021] Figures 9 to 12 A flow chart of a method of supporting configuration of sidelink transmissions according to aspects of the present disclosure is illustrated. DETAILED DESCRIPTION

[0022] In some wireless communication systems, methods and techniques for sidelink transmissions on unlicensed carrier frequencies are provided. However, these techniques may not take into account transmission priorities for sidelink transmissions.

[0023] Therefore, the present disclosure provides a technology for supporting the configuration of sidelink transmission. For example, a method for determining a sidelink transmission offset based on a sidelink transmission priority is provided. For example, the sidelink transmission offset can be determined as a positive offset value from a symbol boundary time and / or a negative offset value from a symbol boundary time.

[0024] By utilizing the above-described techniques, sidelink frequency resources (eg, in an unlicensed spectrum) may be utilized more efficiently while reducing signal interference in such sidelink frequency resources.

[0025] Aspects of the present disclosure are described in the context of a wireless communication system. Aspects of the present disclosure are further illustrated and described with reference to device diagrams and flow charts.

[0026] Figure 1 An example of a wireless communication system 100 configured to support sidelink transmission according to various aspects of the present disclosure is illustrated. The wireless communication system 100 may include one or more network entities 102, one or more UEs 104, a core network 106, and a packet data network 108. The wireless communication system 100 may support various radio access technologies. In some implementations, the wireless communication system 100 may be a 4G network, such as an LTE network or an advanced LTE (LTE-A) network. In some other implementations, the wireless communication system 100 may be a 5G network, such as an NR network. In other implementations, the wireless communication system 100 may be a combination of a 4G network and a 5G network, or other suitable radio access technologies, including the Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20. The wireless communication system 100 may support radio access technologies other than 5G. In addition, the wireless communication system 100 may support technologies such as time division multiple access (TDMA), frequency division multiple access (FDMA), or code division multiple access (CDMA).

[0027] One or more network entities 102 may be dispersed throughout a geographic area to form a wireless communication system 100. One or more of the network entities 102 described herein may be or include or may be referred to as a network node, a base station, a network element, a radio access network (RAN), a base transceiver station, an access point, a NodeB, an eNodeB (eNB), a next generation NodeB (gNB), or other suitable terms. The network entity 102 and the UE 104 may communicate via a communication link 110, which may be a wireless or wired connection. For example, the network entity 102 and the UE 104 may perform wireless communication (e.g., receive signaling, send signaling) over a Uu interface.

[0028] The network entity 102 may provide a geographic coverage area 112 for which the network entity 102 supports services (e.g., voice, video, packet data, messaging, broadcast, etc.) for one or more UEs 104 within the geographic coverage area 112. For example, the network entity 102 and the UE 104 may support wireless communications of signals associated with services (e.g., voice, video, packet data, messaging, broadcast, etc.) according to one or more radio access technologies. In some implementations, the network entity 102 may be mobile, for example, a satellite associated with a non-terrestrial network. In some implementations, different geographic coverage areas 112 associated with the same or different radio access technologies may overlap, but different geographic coverage areas 112 may be associated with different network entities 102. The information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0029] One or more UEs 104 may be dispersed throughout the geographic area of ​​the wireless communication system 100. UE 104 may include or may be referred to as a mobile device, a wireless device, a remote device, a remote unit, a handheld device, a subscriber device, or some other suitable term. In some implementations, UE 104 may be referred to as a unit, a station, a terminal, or a client, etc. Additionally or alternatively, UE 104 may be referred to as an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communication (MTC) device, etc. In some implementations, UE 104 may be stationary in the wireless communication system 100. In some other implementations, UE 104 may be mobile in the wireless communication system 100.

[0030] One or more UEs 104 may be devices of different forms or with different capabilities. Figure 1 Some examples of UE 104 are illustrated in FIG. Figure 1As shown, UE 104 can communicate with various types of devices, such as network entity 102, other UEs 104, or network devices (e.g., core network 106, packet data network 108, relay device, integrated access and backhaul (IAB) node, or another network device), such as Figure 1 Additionally or alternatively, the UE 104 can support communications with other network entities 102 or UEs 104 that can act as relays in the wireless communication system 100.

[0031] The UE 104 may also be capable of supporting wireless communications directly with other UEs 104 via a communication link 114. For example, the UE 104 may support wireless communications directly with another UE 104 via a device-to-device (D2D) communication link. In some implementations, such as vehicle-to-vehicle (V2V) deployments, V2X deployments, or cellular V2X deployments, the communication link 114 may be referred to as a sidelink. For example, the UE 104 may support wireless communications directly with another UE 104 via a PC5 interface.

[0032] The network entity 102 may support communication with the core network 106 or with another network entity 102 or both. For example, the network entity 102 may interface with the core network 106 via one or more backhaul links 116 (e.g., via S1, N2, N2 or another network interface). The network entities 102 may communicate with each other via the backhaul links 116 (e.g., via X2, Xn or another network interface). In some implementations, the network entities 102 may communicate directly with each other (e.g., between the network entities 102). In some other implementations, the network entities 102 may communicate with each other or indirectly (e.g., via the core network 106). In some implementations, one or more network entities 102 may include subcomponents, such as access network entities, which may be examples of access node controllers (ANCs). The ANC may communicate with one or more UEs 104 via one or more other access network transport entities (which may be referred to as radio heads, smart radio heads, or transport reception points (TRPs)).

[0033] In some implementations, the network entity 102 may be configured in a decomposed architecture that may be configured to utilize a protocol stack that is physically or logically distributed between two or more network entities 102, such as an integrated access backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration hosted by the O-RAN Alliance), or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN)). For example, the network entity 102 may include one or more of a central unit (CU), a distributed unit (DU), a radio unit (RU), a RAN intelligent controller (RIC) (e.g., a near real-time RIC (near RT RIC), a non-real-time RIC (non-RT RIC)), a service management and orchestration (SMO) system, or any combination thereof.

[0034] The RU may also be referred to as a radio head, a smart radio head, a remote radio head (RRH), a remote radio unit (RRU), or a transmission reception point (TRP). In a decomposed RAN architecture, one or more components of the network entity 102 may be collocated, or one or more components of the network entity 102 may be located at distributed locations (e.g., separate physical locations). In some implementations, one or more network entities 102 of the decomposed RAN architecture may be implemented as virtual units (e.g., virtual CU (VCU), virtual DU (VDU), virtual RU (VRU)).

[0035] The functional split between CU, DU and RU can be flexible, and different functions can be supported according to the functions performed at the CU, DU or RU (e.g., network layer functions, protocol layer functions, baseband functions, radio frequency functions and any combination thereof). For example, a functional split of the protocol stack can be adopted between the CU and the DU, so that the CU can support one or more layers of the protocol stack and the DU can support one or more different layers of the protocol stack. In some implementations, the CU can host upper protocol layer (e.g., Layer 3 (L3), Layer 2 (L2)) functions and signaling (e.g., Radio Resource Control (RRC), Service Data Adaptation Protocol (SDAP), Packet Data Convergence Protocol (PDCP)). The CU can be connected to one or more DUs or RUs, and one or more DUs or RUs can host lower protocol layers, such as Layer 1 (L1) (e.g., PHY layer) or L2 (e.g., Radio Link Control (RLC) layer, MAC layer) functions and signaling, and each can be at least partially controlled by the CU.

[0036] Additionally or alternatively, a functional split of the protocol stack may be employed between the DU and the RU such that the DU may support one or more layers of the protocol stack and the RU may support one or more different layers of the protocol stack. The DU may support one or more different cells (e.g., via one or more RUs). In some implementations, the functional split between the CU and the DU or between the DU and the RU may be within the protocol layer (e.g., some functions of the protocol layer may be performed by one of the CU, DU, or RU, while other functions of the protocol layer are performed by different items of the CU, DU, or RU).

[0037] The CU may be further functionally split into CU control plane (CU-CP) and CU user plane (CU-UP) functions. The CU may be connected to one or more DUs via a medium-range communication link (e.g., F1, F1-c, F1-u), and the DU may be connected to one or more RUs via a fronthaul communication link (e.g., an open fronthaul (FH) interface). In some implementations, the medium-range communication link or the fronthaul communication link may be implemented based on interfaces (e.g., channels) between layers of a protocol stack supported by a corresponding network entity 102 communicating via such a communication link.

[0038] The core network 106 may support user authentication, access authorization, tracking, connection, and other access, routing, or mobility functions. The core network 106 may be an evolved packet core (EPC) or a 5G core (5GC), which may include control plane entities that manage access and mobility (e.g., mobility management entity (MME), access and mobility management function (AMF)), and user plane entities that route packets or interconnections to external networks (e.g., serving gateway (S-GW), packet data network (PDN) gateway (P-GW), or user plane function (UPF)). In some implementations, the control plane entities may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management (e.g., data bearers, signal bearers, etc.) of one or more UEs 104 served by one or more network entities 102 associated with the core network 106.

[0039] The core network 106 may communicate with the packet data network 108 via one or more backhaul links 116 (e.g., via S1, N2, N2, or another network interface). The packet data network 108 may include an application server 118. In some implementations, one or more UEs 104 may communicate with the application server 118. The UE 104 may establish a session (e.g., a PDU session, etc.) with the core network 106 via the network entity 102. The core network 106 may use the established session (e.g., the established PDU session) to route traffic (e.g., control information, data, etc.) between the UE 104 and the application server 118. The PDU session may be an example of a logical connection between the UE 104 and the core network 106 (e.g., one or more network functions of the core network 106).

[0040] In the wireless communication system 100, the network entity 102 and the UE 104 may use the resources of the wireless communication system 100 (e.g., time resources (e.g., symbols, time slots, subframes, frames, etc.) or frequency resources (e.g., subcarriers, carriers)) to perform various operations (e.g., wireless communication). In some implementations, the network entity 102 and the UE 104 may support different resource structures. For example, the network entity 102 and the UE 104 may support different frame structures. In some implementations, such as in 4G, the network entity 102 and the UE 104 may support a single frame structure. In some other implementations, such as in 5G and other suitable radio access technologies, the network entity 102 and the UE 104 may support various frame structures (e.g., multiple frame structures). The network entity 102 and the UE 104 may support various frame structures based on one or more digital technologies.

[0041] One or more digital technologies may be supported in the wireless communication system 100, and the digital technologies may include subcarrier spacing and cyclic prefixes. A first digital technology (e.g., μ = 0) may be associated with a first subcarrier spacing (e.g., 15kHz) and a normal cyclic prefix. A first digital technology (e.g., μ = 0) associated with a first subcarrier spacing (e.g., 15kHz) may utilize one slot per subframe. A second digital technology (e.g., μ = 1) may be associated with a second subcarrier spacing (e.g., 30kHz) and a normal cyclic prefix. A third digital technology (e.g., μ = 2) may be associated with a third subcarrier spacing (e.g., 60kHz) and a normal cyclic prefix or an extended cyclic prefix. A fourth digital technology (e.g., μ = 3) may be associated with a fourth subcarrier spacing (e.g., 120kHz) and a normal cyclic prefix. A fifth digital technology (e.g., μ = 4) may be associated with a fifth subcarrier spacing (e.g., 240kHz) and a normal cyclic prefix.

[0042] The time intervals of resources (e.g., communication resources) can be organized according to frames (also referred to as radio frames). Each frame can have a duration, for example, a duration of 10 milliseconds (ms). In some implementations, each frame can include multiple subframes. For example, each frame can include 10 subframes, and each subframe can have a duration, for example, a duration of 1 ms. In some implementations, each frame can have the same duration. In some implementations, each subframe of a frame can have the same duration.

[0043] Additionally or alternatively, the time intervals of resources (e.g., communication resources) can be organized according to time slots. For example, a subframe may include a certain number (e.g., quantity) of time slots. Each time slot may include a certain number (e.g., quantity) of symbols (e.g., orthogonal frequency division multiplexing (OFDM) symbols). In some implementations, the number (e.g., quantity) of time slots of a subframe may depend on the digital technology. For a normal cyclic prefix, a time slot may include 14 symbols. For an extended cyclic prefix (e.g., applicable to a 60kHz subcarrier spacing), a time slot may include 12 symbols. For a normal cyclic prefix and an extended cyclic prefix, the relationship between the number of symbols per time slot, the number of time slots per subframe, and the number of time slots per frame may depend on the digital technology. It should be understood that references to a first digital technology (e.g., μ=0) associated with a first subcarrier spacing (e.g., 15kHz) may be used interchangeably between subframes and time slots.

[0044] In the wireless communication system 100, the electromagnetic (EM) spectrum can be divided into various categories, frequency bands, frequency channels, etc. based on frequency or wavelength. For example, the wireless communication system 100 can support one or more operating frequency bands, such as frequency range names FR1 (410 MHz-7.125 GHz), FR2 (24.25 GHz-52.6 GHz), FR3 (7.125 GHz-24.25 GHz), FR4 (52.6 GHz-114.25 GHz), FR4a or FR4-1 (52.6 GHz-71 GHz), and FR5 (114.25 GHz-300 GHz). In some implementations, the network entity 102 and the UE 104 can perform wireless communications on the one or more operating frequency bands. In some implementations, FR1 can be used by the network entity 102 and the UE 104 and other devices or apparatuses for cellular communication services (e.g., control information, data). In some implementations, FR2 can be used by the network entity 102 and the UE 104 and other devices or apparatuses for short-range, high data rate capabilities.

[0045] FR1 may be associated with one or more digital technologies (e.g., at least three digital technologies). For example, FR1 may be associated with a first digital technology (e.g., μ=0) including a subcarrier spacing of 15 kHz; a second digital technology (e.g., μ=1) including a subcarrier spacing of 30 kHz; a third digital technology (e.g., μ=2) including a subcarrier spacing of 60 kHz. FR2 may be associated with one or more digital technologies (e.g., at least 2 digital technologies). For example, FR2 may be associated with a third digital technology (e.g., μ=2) including a subcarrier spacing of 60 kHz; a fourth digital technology (e.g., μ=3) including a subcarrier spacing of 120 kHz.

[0046] Depending on the implementation of the configuration for the sidelink transmission, UE 104(1) may perform a transmission time determination 120 to determine a time for the sidelink transmission. For example, the transmission time determination 120 is based on a priority of the sidelink transmission and may be determined based on a start transmission time offset applied to a symbol boundary time. The transmission time determination 120 may be implemented in various ways, such as based on logic of UE 104(1), a sidelink instruction 122 received from network entity 102, etc. Thus, based at least in part on the transmission time determination 120, UE 104(1) performs a sidelink transmission 124 to UE 104(2) using the determined sidelink transmission time. Various implementations for performing the transmission time determination 120 and the sidelink transmission 124 are described in detail in the present disclosure.

[0047] In some wireless communication systems, resource reservations for sidelinks are specified, such as for PC5 interfaces. 3GPP Technical Specification (TS) 38.212 v17.2.0 describes the number of reservations allowed by a UE. The following fields defined in the first level Sidelink Control Information (SCI) format are mapped to information bits a0 to a1. A-1 , as shown below: Each field is mapped in the order in which it appears in the description, where the first field is mapped to the lowest order information bit a0, and each consecutive field is mapped to a higher order information bit. The most significant bit of each field is mapped to the lowest order information bit of the field, for example, the most significant bit of the first field is mapped to a0.

[0048] SCI format 1-A is used for scheduling of the physical sidelink shared channel (PSSCH) and the second level SCI on the PSSCH. The following information is sent via SCI format 1-A:

[0049] - Priority - 3 bits, as described in clause 5.4.3.3 of [12, TS23.287v17.4.0] and clause 5.22.1.3.1 of [8, TS38.321v17.1.0]. A value of '000' in the Priority field corresponds to a priority value of '1', a value of '001' in the Priority field corresponds to a priority value of '2', and so on.

[0050] Frequency resource allocation - When the value of the higher layer parameter sl-MaxNumPerReserve is configured as 2, bit; otherwise, when the value of the higher-level parameter sl-MaxNumPerReserve is configured as 3, bits, as defined in clause 8.1.5 of [6, TS 38.214v17.2.0].

[0051] · Time Resource Allocation - 5 bits when the value of the higher layer parameter sl-MaxNumPerReserve is configured to 2; otherwise, 9 bits when the value of the higher layer parameter sl-MaxNumPerReserve is configured to 3, as defined in clause 8.1.5 of [6, TS38.214v17.2.0].

[0052] Resource reservation period bits, as defined in clause 16.4 of [5, TS 38.213v17.2.0], where N rsv_period is the number of entries in the higher layer parameter sl-ResourceReservePeriodList; otherwise it is 0 bit.

[0053] Demodulation Reference Signal (DMRS) mode: bits, as defined in clause 8.4.1.1.2 of [4, TS 38.211], where N pattern It is the number of DMRS patterns configured by the higher-layer parameter sl-PSSCH-DMRS-TimePatternList.

[0054] • Stage 2 SCI format - 2 bits, as defined in TS 38.212v17.2.0 Table 8.3.1.1-1.

[0055] Beta_offset indicator - 2 bits, provided by the higher layer parameter sl-BetaOffsets2ndSCI and Table 8.3.1.1-2 of TS38.212v17.2.0.

[0056] • Number of DMRS ports - 1 bit, as defined in TS 38.212 v17.2.0 Table 8.3.1.1-3.

[0057] Modulation and coding scheme - 5 bits, as defined in clause 8.1.3 of [6, TS 38.214v17.2.0].

[0058] Additional Modulation Coding Scheme (MCS) Table Indicator - as defined in clause 8.1.3.1 of [6, TS 38.214 v17.2.0]: 1 bit if one MCS table is configured by the higher layer parameter sl-Additional-MCS-Table; 2 bits if two MCS tables are configured by the higher layer parameter sl-Additional-MCS-Table; otherwise 0 bit.

[0059] PSFCH Overhead Indication - as defined in clause 8.1.3.2 of [6, TS 38.214 v17.2.0], 1 bit if the higher layer parameter sl-PSFCH-Period = 2 or 4; otherwise 0 bit.

[0060] Reserved - The number of bits determined by:

[0061] oN reserved Bit, configured by the higher layer parameter sl-NumReservedBits, if the higher layer parameter indicationUEBScheme2 is not configured, or if the higher layer parameter indicationUEBScheme2 is configured to 'disable', the value is set to zero;

[0062] o Otherwise, (Nreserved-1) bits, the value is set to zero.

[0063] · Conflict message receiver flag - 0 or 1 bit

[0064] o If the higher layer parameter indicationUEBScheme2 is configured to 'enabled', it is 1 bit, where a bit value of 0 indicates that the UE cannot be a UE for receiving conflicting information, and a bit value of 1 indicates that the UE can be a UE for receiving conflicting information, as defined in clause 16.3.0 of [5, TS 38.213v17.2.0];

[0065] oOtherwise 0 bit.

[0066] Table 8.3.1.1-1: Phase II SCI Format

[0067] The value of the second stage SCI format field Phase II SCI format 00 SCI Format 2-A 01 SCI Format 2-B 10 SCI Format 2-C 11 Reserve

[0068] Table 8.3.1.1-2: Mapping of Beta_offset indicator values ​​to indices in Table 9.3-2 of [5, TS38.213v17.2.0]

[0069] The value of the Beta_offset indicator Beta_offset index in Table 9.3-2 of [5, TS38.213] 00 The first index provided by the high-level parameter sl-BetaOffsets2ndSCI 01 The second index provided by the high-level parameter sl-BetaOffsets2ndSCI 10 The third index provided by the high-level parameter sl-BetaOffsets2ndSCI 11 The fourth index provided by the high-level parameter sl-BetaOffsets2ndSCI

[0070] Table 8.3.1.1-3: Number of (multiple) DMRS ports

[0071] The value of the DMRS Port Number field Antenna Port 0 1000 1 1000 and 1001

[0072] Figure 2 An OFDM symbol 200 is shown in which a cyclic prefix is ​​added, such as to mitigate inter-symbol interference. For example, the OFDM symbol 200 includes N sc samples, the final N cp samples are replicated and appended to the OFDM symbol, resulting in a total of N sc +N cp samples.

[0073] Figure 3 OFDM symbol 300 is illustrated in which a cyclic prefix is ​​added, such as to mitigate inter-symbol interference in unlicensed carriers. As described above, similar principles can be applied to OFDM symbol 200 generation, but with one significant difference: the N from end to start cpe The number of samples replicated is greater than N cp , while the total duration of the CP-OFDM symbol 300 is still N sc +N cp samples. This means that the first N cpe -N cp samples extend into the duration of the previous CP-OFDM symbol, such as Figure 3 As shown, Figure 3 The symbol boundaries are also shown.

[0074] In some wireless communication systems, OFDM baseband signal generation is implemented for channels other than the Physical Random Access Channel (PRACH) and RAN Information Management (RIM)-RS. A time-continuous signal on antenna port p and OFDM symbols in a subframe of any physical channel or signal except PRACH The subcarrier spacing configuration μ is defined by

[0075]

[0076] Where t=0 at the beginning of the subframe,

[0077]

[0078]

[0079] and

[0080] Δf is given by TS 38.211v17.2.0, clause 4.2;

[0081] μ is the subcarrier spacing configuration;

[0082] μ0 is the maximum μ value among the subcarrier spacing configurations made by scs-SpecificCarrierList for each of the uplink and downlink and by sl-SCS-SpecificCarrierList for the sidelink.

[0083] In case of cyclic prefix extension of the first OFDM symbol 1 allocated for physical uplink shared channel (PUSCH), sounding reference signal (SRS), or physical uplink control channel (PUCCH) transmission, the interval before the first OFDM symbol of PUSCH, SRS, or PUCCH A time-continuous signal Given by the following formula

[0084]

[0085] where t<0 refers to the signal in the previous subframe, and

[0086] For dynamically scheduled PUSCH, SRS and PUCCH transmissions

[0087]

[0088] where Δ i Given in Table 5.3.1-1, where for μ∈{0,1}, C1=1, for μ=2, C1=2, C2 and C3 are given by the high-level parameters cp-ExtensionC2 and cp-ExtensionC3, respectively, T TA Given by TS 38.211v17.2.0 section 4.3.1. For contention-based random access, or in the absence of higher layer configuration of C2 and C3, for each value of i∈{2,3}, C i The value will be set to satisfy The largest integer. ext Applied to the first uplink (UL) transmission scheduled by scheduling downlink control information (DCI).

[0089] For PUSCH transmissions using configuration grants

[0090]

[0091] where Δ i Given in Table 5.3.1-2, the index i is given by the procedure in [6, TS 38.214v17.2.0].

[0092] The starting position of an OFDM symbol l for a subcarrier spacing configuration μ in a subframe is given by

[0093]

[0094] Table 5.3.1-1: Variable C for cyclic prefix extension i and Δ i

[0095] <![CDATA[T ext Index i]]> <![CDATA[C i ]]> <![CDATA[Δ i ]]> 0 - - 1 <![CDATA[C1]]> <![CDATA[25·10 -6 ]]> 2 <![CDATA[C2]]> <![CDATA[16·10 -6 +T TA ]]> 3 <![CDATA[C3]]> <![CDATA[25·10 -6 +T TA ]]>

[0096] Table 5.3.1-2: Variable Δ for cyclic prefix extension with configuration authorization i .

[0097]

[0098] In order to improve the challenges faced by sidelink transmissions on unlicensed carriers in some wireless communication systems, the present disclosure details solutions for the configuration of sidelink transmissions. In the discussion of the present disclosure, different starting positions and / or cyclic prefix extension durations are represented by time values, such as 16 microseconds (μs). This convention is proposed for discussion and can be broadly interpreted as covering, for example, an equal number of digital samples that may depend on the sampling frequency or sample duration in the communication system. For example, in a 3GPP NR multi-carrier communication system operating with a subcarrier spacing of 15kHz and a fast Fourier transform (FFT) / inverse FFT (IFFT) size of 4096, the sampling frequency is 61.44MHz and the sample duration is approximately 16.276 nanoseconds (ns). Therefore, the value of 16μs can be regarded as equivalent to the next higher or lower number of samples, which are closest to 16μs, such as 983 or 984 samples. Similarly, the 25μs value of this digital technology can be regarded as equivalent to 1536 samples. In addition, the 3GPP NR standard 38.211v17.2.0 uses the time unit T c =1 / (Δf max ×N f ) represents the size of various fields, where Δf max =480×10 3 Hz, and N f =4096, we get T c =1 / (1966080000). Therefore, the value of 16 μs can be regarded as equivalent to 31457 or 31458 time units T.c , similarly, the value of 25 μs can be considered to be equivalent to 49152 time units T c .

[0099] Hereinafter, it should be understood that "starting transmission" and similar expressions on an unlicensed carrier may involve successfully performing a clear channel assessment (CCA) in advance, such as by following a listen-before-talk (LBT) procedure. In addition, "attempting to transmit" and similar expressions may involve undergoing a CCA procedure to determine whether channel access and channel transmission are allowed.

[0100] In an implementation, the SL UE may determine possible transmission start positions in a symbol by the corresponding configuration of the resource pool (RP) in which the transmission is to occur. For example, the RP may be configured with one or more allowed start positions. According to one implementation, the UE may use any allowed start position in a symbol. For example, see Figure 5 For example, if CCA is not successful at the first allowed starting position in a time slot, the UE may continue CCA to determine whether CCA is successful at a later allowed starting position, and the UE may begin transmission at the appropriate starting position.

[0101] In implementation, the UE may select any of the allowed starting positions in the time slot. If CCA is not successful at the selected allowed starting position in a symbol, the UE may not attempt to transmit in the same symbol at a later time. Depending on the specific implementation, the UE selects the allowed starting position(s) by a random process.

[0102] In implementation, the SL UE may start transmission from one or more allowed starting positions at or after the beginning of a symbol boundary. The multiple allowed starting positions may include a maximum gap duration during which CCA or CCA with a fixed contention window size is not implemented. For example, for sidelink transmissions on an unlicensed carrier in FR1, the allowed starting positions may include one or more of {0μs, 16μs, 25μs} after the beginning of a symbol boundary.

[0103] In implementation, the UE may use any allowed starting position in a symbol. For example, if CCA is not successful at the first allowed starting position in a time slot, the UE may continue CCA to determine if CCA is successful at a later allowed starting position, and if so, the UE may start transmission at the appropriate starting position.

[0104] In an implementation, the UE may select a starting position from the allowed starting positions in the symbol. If CCA is not successful at the selected allowed starting position in the symbol, the UE may not attempt to transmit in the same symbol at a later time. According to at least one implementation, the UE selects one of the allowed starting positions by a random process.

[0105] Figure 4 A scenario 400 is illustrated in accordance with various aspects of the present disclosure, wherein a sidelink UE may begin transmission before a symbol boundary begins. For example, a SL transmission may begin at time For example, this may be accomplished using a "cyclic prefix extension" (CPE) 402, where the cyclic prefix at the beginning of a symbol 404 (symbol n) is extended by a first duration to the previous symbol 406, symbol n-1.

[0106] In implementation, the UE may use any allowed starting position in a symbol. For example, if CCA is not successful at the first allowed starting position in a symbol, the UE may continue CCA to determine whether CCA is successful at a later allowed starting position, and the UE may start transmission at the appropriate starting position.

[0107] In implementation, the UE may select any one of the allowed starting positions in the symbol. If CCA is not successful at the selected allowed starting position in the symbol, the UE may not attempt to transmit in the same symbol at a later time. For example, the UE selects one of the allowed starting positions by a random process.

[0108] In implementation, the SL UE may apply a start transmission time offset based on the priority of its SL transmission. For example, the start transmission time offset may be implemented by starting the SL transmission before the start of a symbol boundary, for example, by the cyclic prefix extension described above, or by starting the SL transmission after the start of a symbol boundary as described above.

[0109] Figure 5 Scenario 500 is illustrated in accordance with various aspects of the present disclosure, wherein SL transmission may begin after a symbol boundary. Scenario 500 includes symbol 502 (symbol n) and previous symbol 504 (symbol n-1). In addition, scenario 500 illustrates symbol boundary 506 and transmission start time 508. For example, in scenario 500, the start time of UE transmission may be represented as Where T offset A positive value of indicates the start of transmission after the start of a symbol boundary.

[0110] Figure 6 Scenario 600 is illustrated in accordance with various aspects of the present disclosure, wherein SL transmission begins before a symbol boundary. Scenario 600 includes symbol 602 (symbol n) and previous symbol 604 (symbol n-1). In addition, scenario 600 illustrates symbol boundary 606. Depending on the implementation, T offset A negative value of T may indicate the start of a transmission before the start of a symbol boundary. offset A value of =0 may indicate the start of transmission at the beginning of a symbol boundary.

[0111] In implementation, the T of the higher priority SL transmission offset A value less than or equal to the T of the lower priority SL transmission offset For example, this applies whether a higher priority is associated with a higher priority value or a lower priority value. For example, the "priority index" and / or the "priority field" can associate a larger value with a higher priority. Conversely, the "channel access priority class" (CAPC) can associate a larger value with a lower priority.

[0112] In an implementation, each value that can be represented by a "priority index" or "priority" field can be associated with T offset In addition, the UE may determine the priority of its SL transmission based on the determined CAPC for channel access.

[0113] In an implementation, the UE determines the priority of the SL transmission based on the priorities outlined in clause 5.22.1.3.1 of 38.321 v17.2.0. According to one implementation, the priority or T associated with one or more of the following transmissions offset The value is pre-configured. The pre-configuration may be performed by the network via UE-specific RRC signaling and / or resource pool-based configuration.

[0114] Physical Sidelink Feedback Channel (PSFCH)

[0115] Positioning Reference Signal (PRS)

[0116] SCI without transport block transmission

[0117] Media Access Control (MAC) Control Element (CE)

[0118] In implementation, the application of a time offset for starting transmission may be performed by the first device, such as if the first device knows that the second device intends to transmit partially or completely in the same resources, such as symbols or time slots (alternatively or additionally, the same time-frequency resources). For example, the second UE may announce the reserved resources via an SCI transmission. The SCI may be read and interpreted by the first device to determine the resources reserved by the second device. In some wireless communication systems using licensed carriers, the first device may not attempt to transmit on the reserved resources. However, on unlicensed carriers, such "overbooking" may be allowed to more efficiently utilize radio resources. For example, even if the second device has reserved resources, it may ultimately be unable to transmit on the reserved resources, for example, due to a CCA failure. Allowing the first device to attempt to access such reserved resources may still succeed.

[0119] In implementation, preferably, such overbooking is performed by the first device on a reserved resource with a positive time offset value, such as T offset >0 (or greater than / greater than or equal to a preconfigurable time offset value) to ensure that the second device for which resources are reserved has priority in using the channel, e.g., is not preempted by the first device. Thus, a device attempting to transmit on the resources reserved for itself may apply a negative or zero time offset value for that transmission, e.g., T offset ≤0 (or less than / less than or equal to a preconfigurable time offset value).

[0120] In implementations, a device attempting to send or start transmission on non-reserved resources (e.g., resources other than those reserved by the device for itself, i.e., resources that it is not aware of being reserved by another device) applies an offset value T offset =0.

[0121] In implementations, the applicability of the time offset, the conditions under which the time offset should be applied, and / or the time offset value or value range may be pre-configured by the gNB to the UE and / or may be part of a resource pool configuration applicable to one or more UEs. Additionally, whether resource overbooking (e.g., attempting to transmit on resources reserved by another device) is allowed may be pre-configured by the gNB to the UE and / or may be part of a resource pool configuration applicable to one or more UEs.

[0122] For purposes of illustration and not limitation, a specific value or value range corresponding to the time offset value is preferably a value consisting of ±{25 μs, 16 μs, 25 μs+T TA , 16μs+T TA}, where T TA is the timing advance value applicable to the device's transmissions.

[0123] Figure 7 An example of a block diagram 700 of a device 702 (e.g., an apparatus) configured to support sidelink transmissions in accordance with aspects of the present disclosure is illustrated. The device 702 may be an example of a UE 104 as described herein. The device 702 may support wireless communications with one or more network entities 102, UEs 104, or any combination thereof. The device 702 may include components for bidirectional communications, including components for sending and receiving communications (such as a processor 704, a memory 706, a transceiver 708, and an I / O controller 710). These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., a bus).

[0124] The processor 704, the memory 706, the transceiver 708, or various combinations thereof, or various components thereof may be examples of means for performing various aspects of the present disclosure described herein. For example, the processor 704, the memory 706, the transceiver 708, or various combinations thereof, or components thereof may support methods for performing one or more of the operations described herein.

[0125] In some implementations, the processor 704, the memory 706, the transceiver 708, or various combinations or components thereof may be implemented in hardware (e.g., in a communication management circuit system). The hardware may include a processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, which is configured to or otherwise supports components for performing the functions described in the present disclosure. In some implementations, the processor 704 and the memory 706 coupled to the processor 704 may be configured to perform one or more functions described herein (e.g., by executing instructions stored in the memory 706 by the processor 704. For example, in the context of the UE 104, the transceiver 708 and the processor 704 coupled to the transceiver 708 are configured to cause the UE 104 to perform various described operations and / or combinations thereof.

[0126] For example, according to examples disclosed herein, the processor 704 and / or the transceiver 708 can support wireless communications at the device 702. For example, the processor 704 and / or the transceiver 708 can be configured to or otherwise support a component for: generating a transmission; and sending the transmission via a sidelink resource at a first time instant, the first time instant being determined based on a symbol boundary time instant and a first start transmission time offset, and the first start transmission time offset being determined based at least in part on a first transmission priority for the transmission.

[0127] In addition, in some implementations, the sidelink resources appear in an unlicensed spectrum; the symbol boundaries include time slot boundaries; the first start transmission time offset for a first transmission priority is less than the second transmission time offset for a second transmission priority, and wherein the first transmission priority is higher than the second transmission priority; the processor is further configured to: determine whether the sidelink resources are reserved by a second device; and determine the first start transmission time offset to be a non-zero value based at least in part on the determination that the sidelink resources are reserved by a different device; the processor is further configured to: determine whether the first transmission priority exceeds a transmission priority threshold; and determine the first start transmission time offset to be a non-zero value based at least in part on the determination that the first transmission priority exceeds the transmission priority threshold.

[0128] In addition, in some implementations, the processor is also configured to use cyclic prefix extension to implement the first start transmission time offset when the first start transmission time offset has a negative value; the processor is also configured to perform a clear channel assessment on the sidelink resource before sending a transmission through the sidelink resource; the processor is also configured to determine a first transmission priority based at least in part on a resource pool for the sidelink resource; the processor is also configured to send a transmission through the sidelink resource at a first moment based at least in part on a failure of the clear channel assessment at a second moment and a success of the clear channel assessment at a first moment; the processor is also configured to determine that the first moment occurs before a symbol boundary moment; the processor is also configured to receive a notification from a second device that the first start transmission time offset is applied based at least in part on the first transmission priority.

[0129] According to examples disclosed herein, a processor 704 of a device 702, such as UE 104, may support wireless communications. The processor 704 includes at least one controller coupled to at least one memory, and is configured or operable to cause the processor to: generate a transmission; and send the transmission via a sidelink resource at a first time, the first time being determined according to a symbol boundary time and a first start transmission time offset, and the first start transmission time offset is determined at least in part based on a first transmission priority for the transmission. In addition, the processor 704, including at least one controller coupled to at least one memory, is further configured and / or operable to perform any one or more of the operations described herein with reference to a UE (e.g., UE 104).

[0130] The processor 704 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some implementations, the processor 704 may be configured to operate a memory array using a memory controller. In some other implementations, the memory controller may be integrated into the processor 704. The processor 704 may be configured to execute computer-readable instructions stored in a memory (e.g., a memory 706) to cause the device 702 to perform various functions of the present disclosure.

[0131] The memory 706 may include random access memory (RAM) and read-only memory (ROM). The memory 706 may store computer-readable computer executable code, which includes instructions that, when executed by the processor 704, cause the device 702 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as a system memory or another type of memory. In some implementations, the code may not be directly executable by the processor 704, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein. In some implementations, the memory 706 may include a basic I / O system (BIOS), which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0132] I / O controller 710 can manage input and output signals of device 702. I / O controller 710 can also manage peripheral devices that are not integrated into device 2402. In some implementations, I / O controller 710 can represent a physical connection or port to an external peripheral device. In some implementations, I / O controller 710 can utilize an operating system, such as Or another known operating system. In some implementations, I / O controller 710 can be implemented as part of a processor such as processor M08. In some implementations, a user can interact with device 702 via I / O controller 710 or via hardware components controlled by I / O controller 710.

[0133] In some implementations, the device 702 may include a single antenna 712. However, in some other implementations, the device 702 may have more than one antenna 712 (i.e., multiple antennas), including multiple antenna panels or antenna arrays, which are capable of concurrently sending or receiving multiple wireless transmissions. The transceiver 708 can communicate bidirectionally via one or more antennas 712, wired or wireless links, as described herein. For example, the transceiver 708 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 708 may also include a modem for modulating packets, providing the modulated packets to one or more antennas 712 for transmission, and demodulating packets received from one or more antennas 712.

[0134] Figure 8An example of a block diagram 800 of a device 802 (e.g., an apparatus) configured to support sidelink transmissions in accordance with aspects of the present disclosure is illustrated. The device 802 may be an example of a network entity 102 as described herein. The device 802 may support wireless communications with one or more network entities 102, UEs 104, or any combination thereof. The device 802 may include components for bidirectional communications, including components for sending and receiving communications (such as a processor 804, a memory 806, a transceiver 808, and an I / O controller 810). These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., a bus).

[0135] The processor 804, the memory 806, the transceiver 808, or various combinations thereof, or various components thereof may be examples of means for performing various aspects of the present disclosure described herein. For example, the processor 804, the memory 806, the transceiver 808, or various combinations thereof, or components thereof may support methods for performing one or more of the operations described herein.

[0136] In some implementations, the processor 804, the memory 806, the transceiver 808, or various combinations or components thereof may be implemented in hardware (e.g., in a communication management circuit system). The hardware may include a processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, which is configured to or otherwise supports means for performing the functions described in the present disclosure. In some implementations, the processor 804 and the memory 806 coupled to the processor 804 may be configured to perform one or more functions described herein (e.g., by executing instructions stored in the memory 806 by the processor 804. For example, in the context of the network entity 102, the transceiver 808 and the processor 804 coupled to the transceiver 808 are configured to cause the network entity 102 to perform various described operations and / or combinations thereof.

[0137] For example, according to examples disclosed herein, the processor 804 and / or the transceiver 808 may support wireless communications at the device 802. For example, the processor 804 and / or the transceiver 808 may be configured to or otherwise support a component for: generating a notification including one or more transmission priorities for sidelink transmissions and one or more transmission time offsets to be applied to one or more sidelink transmissions associated with the one or more transmission priorities; and sending the notification to a second device.

[0138] In addition, in some implementations, the notification indicates that one or more transmission priorities and one or more transmission time offsets are to be applied to one or more sidelink transmissions on the unlicensed spectrum; the notification includes a first transmission priority associated with the first transmission time offset and a second transmission priority associated with the second transmission time offset; the first transmission priority is higher than the second transmission priority; and the first transmission time offset is less than the second transmission time offset; the notification also includes an indication of the following items: when the sidelink resources for the sidelink transmission are determined to be reserved by the third device, the second device determines the transmission time offset to be a non-zero value.

[0139] In addition, in some implementations, the notification also includes an indication of the following items: the second device determines the transmission time offset as a non-zero value when the transmission priority exceeds the transmission priority threshold; the notification also includes an indication for using a cyclic prefix extension to implement at least one transmission time offset; in some aspects, the technology described herein relates to a first device, wherein the notification also includes an indication of an association of one or more transmission priorities with a resource pool for sidelink transmissions; the notification also includes an indication that at least one transmission time offset is applicable to determining a time moment occurring before a symbol boundary moment of the sidelink transmission; the processor is configured to send the notification via radio resource control (RRC) signaling.

[0140] The processor 804 may include an intelligent hardware device (e.g., a general purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some implementations, the processor 804 may be configured to operate a memory array using a memory controller. In some other implementations, the memory controller may be integrated into the processor 804. The processor 804 may be configured to execute computer-readable instructions stored in a memory (e.g., a memory 806) to cause the device 802 to perform various functions of the present disclosure.

[0141] The memory 806 may include random access memory (RAM) and read-only memory (ROM). The memory 806 may store computer-readable computer executable code, which includes instructions that, when executed by the processor 804, cause the device 802 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as a system memory or another type of memory. In some implementations, the code may not be directly executable by the processor 804, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein. In some implementations, the memory 806 may include a basic I / O system (BIOS), which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0142] I / O controller 810 can manage input and output signals of device 802. I / O controller 810 can also manage peripheral devices that are not integrated into device 2402. In some implementations, I / O controller 810 can represent a physical connection or port to an external peripheral device. In some implementations, I / O controller 810 can utilize an operating system, such as Or another known operating system. In some implementations, I / O controller 810 can be implemented as part of a processor such as processor M06. In some implementations, a user can interact with device 802 via I / O controller 810 or via hardware components controlled by I / O controller 810.

[0143] In some implementations, the device 802 may include a single antenna 812. However, in some other implementations, the device 802 may have more than one antenna 812 (i.e., multiple antennas), including multiple antenna panels or antenna arrays, which are capable of concurrently sending or receiving multiple wireless transmissions. The transceiver 808 can communicate bidirectionally via one or more antennas 812, wired or wireless links, as described herein. For example, the transceiver 808 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 808 may also include a modem for modulating packets, providing the modulated packets to one or more antennas 812 for transmission, and demodulating packets received from one or more antennas 812.

[0144] Fig. 9 A flow chart of a method 900 for supporting configuration of sidelink transmissions according to aspects of the present disclosure is illustrated. The operations of the method 900 may be implemented by the apparatus described herein or components thereof. For example, the operations of the method 900 may be implemented by the apparatus described herein or components thereof. Figures 1 to 8 The UE 104 described herein performs. In some implementations, the device may execute a set of instructions to control the functional elements of the device to perform the described functions. Additionally or alternatively, the device may use dedicated hardware to perform various aspects of the described functions.

[0145] At 902, the method may include generating a transmission at a first device. The operations of 902 may be performed according to examples described herein. In some implementations, aspects of the operations of 902 may be described by reference to Figure 1 The device is used to perform the above.

[0146] At 904, the method may include sending, by the first device, a transmission via the sidelink resource at a first time instant, the first time instant being determined based on a symbol boundary time instant and a first start transmission time offset, and the first start transmission time offset being determined based at least in part on a first transmission priority for the transmission. The operations of 904 may be performed according to examples described herein. In some implementations, aspects of the operations of 904 may be performed by reference to Figure 1 The device is used to perform the above.

[0147] Fig.10 A flow chart of a method 1000 for supporting configuration of sidelink transmissions according to aspects of the present disclosure is illustrated. The operations of the method 1000 may be implemented by a device or component thereof as described herein. For example, the operations of the method 1000 may be implemented by a device or component thereof as described in reference to Figures 1 to 8 The UE 104 described herein performs. In some implementations, the device may execute a set of instructions to control the functional elements of the device to perform the described functions. Additionally or alternatively, the device may use dedicated hardware to perform various aspects of the described functions.

[0148] At 1002, the method may include determining whether the sidelink resource is reserved by the second device. The operations of 1002 may be performed according to the examples described herein. In some implementations, aspects of the operations of 1002 may be performed by reference to Figure 1 The device is used to perform the above.

[0149] At 1004, the method may include determining, based at least in part on a determination that the sidelink resource is reserved by a different device, a first start transmission time offset as a non-zero value. The operations of 1004 may be performed according to examples described herein. In some implementations, aspects of the operations of 1004 may be described with reference to Figure 1 The device is used to perform the above.

[0150] Fig.11 A flow chart of a method 1100 for supporting configuration of sidelink transmissions according to aspects of the present disclosure is illustrated. The operations of the method 1100 may be implemented by a device or component thereof as described herein. For example, the operations of the method 1100 may be implemented by a device or component thereof as described in reference to Figures 1 to 8 The UE 104 described herein performs. In some implementations, the device may execute a set of instructions to control the functional elements of the device to perform the described functions. Additionally or alternatively, the device may use dedicated hardware to perform various aspects of the described functions.

[0151] At 1102, the method may include determining whether the first transmission priority exceeds a transmission priority threshold. The operations of 1102 may be performed according to examples described herein. In some implementations, aspects of the operations of 1102 may be described by reference to Figure 1 The device is used to perform the above.

[0152] At 1104, the method may include determining a first start transmission time offset as a non-zero value based at least in part on a determination that the first transmission priority exceeds a transmission priority threshold. The operations of 1104 may be performed according to examples described herein. In some implementations, aspects of the operations of 1104 may be described with reference to Figure 1 The device is used to perform the above.

[0153] Fig.12 A flow chart of a method 1200 for supporting configuration of sidelink transmissions according to aspects of the present disclosure is illustrated. The operations of the method 1200 may be implemented by a device or component thereof as described herein. For example, the operations of the method 1200 may be implemented by a device or component thereof as described in reference to Figures 1 to 8 The network entity 102 performs. In some implementations, the device may execute a set of instructions to control the functional elements of the device to perform the described functions. Additionally or alternatively, the device may use dedicated hardware to perform various aspects of the described functions.

[0154] At 1202, the method may include generating, by a first device, a notification including one or more transmission priorities for sidelink transmissions and one or more transmission time offsets to be applied to one or more sidelink transmissions associated with the one or more transmission priorities. The operations of 1202 may be performed according to examples described herein. In some implementations, aspects of the operations of 1202 may be performed by reference to Figure 1 The device is used to perform the above.

[0155] At 1204, the method may include sending a notification to the second device. The operations of 1204 may be performed according to the examples described herein. In some implementations, aspects of the operations of 1204 may be described by reference to Figure 1 The device is used to perform the above.

[0156] It should be noted that the methods described herein describe possible implementations, and that the operations and steps may be rearranged or otherwise modified, and other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0157] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or executed with a general purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in combination with a DSP core, or any other such configuration).

[0158] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or sent via a computer-readable medium as one or more instructions or codes. Other examples and implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hard wiring, or any combination of these. Features that implement the functions may also be physically located in various locations, including being distributed so that portions of the functions are implemented in different physical locations.

[0159] Computer-readable media include both non-transient computer storage media and communication media, and communication media include any medium that facilitates the transmission of computer programs from one place to another. Non-transient storage media can be any available medium that can be accessed by a general or special-purpose computer. As an example and not limitation, non-transient computer-readable media can include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, disk storage or other magnetic storage devices, or can be used to carry or store desired program code devices in the form of instructions or data structures and can be accessed by a general or special-purpose computer, or any other non-transient medium of a general or special-purpose processor.

[0160] Any connection may be appropriately referred to as a computer-readable medium. For example, if the software is sent from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technology (such as infrared, radio, and microwave), the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technology (such as infrared, radio, and microwave) is included in the definition of computer-readable medium. Disks and optical disks as used herein include CDs, laser disks, optical disks, digital versatile disks (DVDs), floppy disks, and Blu-ray disks, wherein disks typically reproduce data magnetically, and optical disks reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0161] As used herein, including in the claims, "or" used in a list of items (e.g., a list of items beginning with a phrase such as "at least one of" or "one or more of" or "one or both of") represents an inclusive list, so that, for example, a list of at least one of A, B, or C represents A or B or C or AB or AC or BC or ABC (i.e., A and B and C). In addition, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an example step described as "based on condition A" may be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on." In addition, as used herein, including in the claims, a "set" may include one or more elements.

[0162] When referring to a network entity, the terms "send," "receive," or "transmit" may refer to any part of a network entity of a RAN (e.g., base station, CU, DU, RU) that communicates with another device (e.g., directly or via one or more other network entities).

[0163] The descriptions described herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that may be implemented or within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration," rather than "preferred" or "better than other examples." The detailed description includes specific details to facilitate understanding of the described techniques. However, these techniques may be practiced without these specific details. In some cases, known structures and devices are shown in block diagram form to avoid confusing the concepts of the described examples.

[0164] The description herein is provided to enable one of ordinary skill in the art to make or use the present disclosure. Various modifications to the present disclosure will be clear to one of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Therefore, the present disclosure is not limited to the examples and designs described herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A user equipment (UE) for wireless communication, comprising: at least one memory; as well as at least one processor coupled to the at least one memory and configured to cause the UE to: Generate transmission; as well as The transmission is sent via the sidelink resource at a first time instant determined based on a symbol boundary time instant and a first start transmission time offset, and the first start transmission time offset is determined based at least in part on a first transmission priority for the transmission.

2. The UE of claim 1, wherein the sidelink resources occur in an unlicensed spectrum. The UE of claim 1 , wherein the symbol boundary comprises a slot boundary.

4. The UE of claim 1, wherein the first start transmission time offset for the first transmission priority is less than a second transmission time offset for a second transmission priority, and wherein the first transmission priority is higher than the second transmission priority.

5. The UE according to claim 1, wherein the at least one processor is configured to cause the UE to: determining whether the sidelink resource is reserved by a second device; and The first start transmission time offset is determined to be a non-zero value based at least in part on a determination that the sidelink resources are reserved by a different device.

6. The UE according to claim 1, wherein the at least one processor is configured to cause the UE to: determining whether the first transmission priority exceeds a transmission priority threshold; and The first start transmission time offset is determined to be a non-zero value based at least in part on a determination that the first transmission priority exceeds the transmission priority threshold. 7 . The UE of claim 1 , wherein the at least one processor is configured to cause the UE to implement the first start transmission time offset using cyclic prefix extension if the first start transmission time offset has a negative value.

8. The UE of claim 1, wherein the at least one processor is configured to cause the UE to perform a clear channel assessment on the sidelink resource before sending the transmission over the sidelink resource.

9. The UE of claim 1, wherein the at least one processor is configured to cause the UE to determine the first transmission priority based at least in part on a resource pool for the sidelink resources.

10. The UE of claim 1, wherein the at least one processor is configured to cause the UE to send the transmission via the sidelink resource at the first moment based at least in part on a failure of a clear channel assessment at a second moment and a success of a clear channel assessment at the first moment.

11. The UE of claim 1, wherein the at least one processor is configured to cause the UE to determine that the first time instant occurs before the symbol boundary time instant. 12 . The UE of claim 1 , wherein the at least one processor is configured to cause the UE to receive a notification from a second device that the first start transmission time offset is applied based at least in part on the first transmission priority.

13. A base station for wireless communication, comprising: at least one memory; as well as at least one processor coupled to the at least one memory and configured to cause the base station to: generating a notification comprising one or more transmission priorities for sidelink transmissions and one or more transmission time offsets to be applied to one or more sidelink transmissions associated with the one or more transmission priorities; as well as The notification is sent to the second device.

14. The base station of claim 13, wherein the notification indicates that the one or more transmission priorities and the one or more transmission time offsets are to be applied to the one or more sidelink transmissions on an unlicensed spectrum.

15. The base station of claim 13, wherein the notification includes a first transmission priority associated with a first transmission time offset and a second transmission priority associated with a second transmission time offset; The first transmission priority is higher than the second transmission priority; and The first transmission time offset is smaller than the second transmission time offset.

16. The base station of claim 13, wherein the notification further comprises an indication that when the sidelink resource for the sidelink transmission is determined to be reserved by the third device, the second device determines the transmission time offset to be a non-zero value.

17. The base station of claim 13, wherein the notification further comprises an indication that the second device determines the transmission time offset to be a non-zero value when the transmission priority exceeds a transmission priority threshold.

18. The base station of claim 13, wherein the notification further comprises an indication for using a cyclic prefix extension to implement at least one transmission time offset.

19. A processor for wireless communication, comprising: at least one controller coupled to at least one memory and configured to cause the processor to: Generate transmission; as well as The transmission is sent via the sidelink resource at a first time instant determined based on a symbol boundary time instant and a first start transmission time offset, and the first start transmission time offset is determined based at least in part on a first transmission priority for the transmission.

20. A method performed by a user equipment (UE), the method comprising: generating a transmission at the UE; as well as The transmission is sent by the UE via a sidelink resource at a first time, the first time being determined based on a symbol boundary time and a first start transmission time offset, and the first start transmission time offset is determined at least in part based on a first transmission priority for the transmission.

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