Sidelink time synchronization based on zoning

Abstract

Various aspects of the present disclosure generally relate to wireless communications. In some aspects, a first user equipment (UE) may determine whether to transmit a sidelink timing synchronization signal to a second UE based at least in part on a sidelink zone in which the first UE is located and a sidelink zone in which a second UE is located. The first UE may selectively transmit the sidelink timing synchronization signal to the second UE based at least in part on determining whether to transmit the sidelink timing synchronization signal to the second UE. Numerous other aspects are provided.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This patent application claims priority to U.S. Provisional Patent Application No. 63 / 008,261, filed on April 10, 2020, entitled “ZONE BASED SIDELINK TIME SYNCHRONIZATION,” and U.S. Non-Provisional Patent Application No. 17 / 212,781, filed on March 25, 2021, entitled “ZONE BASED SIDELINK TIME SYNCHRONIZATION,” which are hereby expressly incorporated herein by reference.

[0003] Public domain

[0004] Aspects of the present disclosure relate generally to wireless communications, and to techniques and apparatus for zone-based sidelink time synchronization.

[0005] background

[0006] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. Typical wireless communication systems may employ multiple access technologies that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmit power, etc.). Examples of such multiple access technologies include code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, time division synchronous code division multiple access (TD-SCDMA) systems, and long term evolution (LTE). LTE / LTE-Advanced is a set of enhancements to the Universal Mobile Telecommunications System (UMTS) mobile standard promulgated by the Third Generation Partnership Project (3GPP).

[0007] A wireless network may include several base stations (BSs) that can support communications for several user equipments (UEs). A UE may communicate with a BS via a downlink and an uplink. A "downlink" (or "forward link") refers to a communication link from a BS to a UE, while an "uplink" (or "reverse link") refers to a communication link from a UE to a BS. As will be described in more detail herein, a BS may be referred to as a Node B, a gNB, an Access Point (AP), a Radio Head, a Transmit Receiving Point (TRP), a New Radio (NR) BS, a 5G Node B, and the like.

[0008] The above multiple access technologies have been adopted in various telecommunication standards to provide a common protocol that enables different user equipment to communicate at the city, country, region, and even global level. NR (which may also be referred to as 5G) is an enhancement set to the LTE mobile standard promulgated by 3GPP. NR is designed to better support mobile broadband Internet access by using orthogonal frequency division multiplexing (OFDM) (CP-OFDM) with cyclic prefix (CP) on the downlink (DL), using CP-OFDM and / or SC-FDM (e.g., also known as discrete Fourier transform spread OFDM (DFT-s-OFDM)) on the uplink (UL), and supporting beamforming, multiple input multiple output (MIMO) antenna technology and carrier aggregation to improve spectrum efficiency, reduce costs, improve services, utilize new spectrum, and better integrate with other open standards. As the demand for mobile broadband access continues to grow, further improvements to LTE, NR and other radio access technologies are still useful.

[0009] Overview

[0010] In some aspects, a wireless communication method performed by a first user equipment (UE) may include: determining whether to transmit a sidelink timing synchronization signal to a second UE based at least in part on a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located; and selectively transmitting the sidelink timing synchronization signal to the second UE based at least in part on determining whether to transmit the sidelink timing synchronization signal to the second UE.

[0011] In some aspects, a wireless communication method performed by a first UE may include: determining whether the second UE is to transmit a sidelink timing synchronization signal to the first UE based at least in part on a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located; and selectively receiving the sidelink timing synchronization signal from the second UE based at least in part on determining whether the second UE is to transmit the sidelink timing synchronization signal to the first UE.

[0012] In some aspects, a first UE for wireless communication may include a memory and one or more processors coupled to the memory. The one or more processors may be configured to: determine whether to transmit a sidelink timing synchronization signal to a second UE based at least in part on a sidelink zone in which the first UE is located and a sidelink zone in which a second UE is located; and selectively transmit the sidelink timing synchronization signal to the second UE based at least in part on determining whether to transmit the sidelink timing synchronization signal to the second UE.

[0013] In some aspects, a first UE for wireless communication may include a memory and one or more processors coupled to the memory. The one or more processors may be configured to: determine whether the second UE is to transmit a sidelink timing synchronization signal to the first UE based at least in part on a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located; and selectively receive the sidelink timing synchronization signal from the second UE based at least in part on determining whether the second UE is to transmit the sidelink timing synchronization signal to the first UE.

[0014] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When the one or more instructions are executed by one or more processors of a first UE, the one or more processors may determine whether to transmit a sidelink timing synchronization signal to a second UE based at least in part on a sidelink zone in which the first UE is located and a sidelink zone in which a second UE is located; and selectively transmit the sidelink timing synchronization signal to the second UE based at least in part on determining whether to transmit the sidelink timing synchronization signal to the second UE.

[0015] In some aspects, a non-transitory computer-readable medium may store one or more instructions for wireless communication. When the one or more instructions are executed by one or more processors of a first UE, the one or more processors may determine whether the second UE is to transmit a sidelink timing synchronization signal to the first UE based at least in part on the sidelink zone in which the first UE is located and the sidelink zone in which the second UE is located; and selectively receive the sidelink timing synchronization signal from the second UE based at least in part on determining whether the second UE is to transmit the sidelink timing synchronization signal to the first UE.

[0016] In some aspects, a first device for wireless communication may include a memory and one or more processors coupled to the memory. The first device may include a device for determining whether to transmit a sidelink timing synchronization signal to a second device based at least in part on a sidelink zone in which the first device is located and a sidelink zone in which the second device is located; and a device for selectively transmitting the sidelink timing synchronization signal to the second device based at least in part on determining whether to transmit the sidelink timing synchronization signal to the second device.

[0017] In some aspects, a first device for wireless communication may include a memory and one or more processors coupled to the memory. The first device may include a device for determining whether the second device is to transmit a sidelink timing synchronization signal to the first device based at least in part on a sidelink zone in which the first device is located and a sidelink zone in which the second device is located; and a device for selectively receiving the sidelink timing synchronization signal from the second device based at least in part on determining whether the second device is to transmit the sidelink timing synchronization signal to the first device.

[0018] Aspects generally include methods, apparatuses, systems, computer program products, non-transitory computer-readable media, user equipment, base stations, wireless communication devices, and / or processing systems as substantially described herein with reference to and as illustrated in the accompanying drawings and description.

[0019] The foregoing has broadly outlined the features and technical advantages of examples according to the present disclosure in an effort to make the following detailed description better understood. Additional features and advantages will be described hereinafter. The disclosed concepts and specific examples can be easily used as a basis for modifying or designing other structures for implementing the same purpose as the present disclosure. Such equivalent constructions do not depart from the scope of the appended claims. The characteristics of the concepts disclosed herein, both in terms of their organization and method of operation, and the associated advantages will be better understood by considering the following description in conjunction with the accompanying drawings. Each of the accompanying drawings is provided for the purpose of illustration and description and is not intended to define limitations on the claims.

[0020] Although various aspects are described in the present disclosure by explaining some examples, it will be understood by those skilled in the art that these aspects can be implemented in many different arrangements and scenarios. The technology described herein can be implemented using different platform types, devices, systems, shapes, sizes and / or packaging arrangements. For example, some aspects can be implemented via integrated chip embodiments or other devices based on non-module components (e.g., end-user devices, vehicles, communication equipment, computing equipment, industrial equipment, retail / shopping equipment, medical equipment, or devices that enable artificial intelligence). Various aspects can be implemented in chip-level components, module components, non-module components, non-chip-level components, device-level components, or system-level components. The equipment incorporating the various aspects and features described may include additional components and features for implementing and practicing the various aspects claimed and described. For example, the transmission and reception of wireless signals may include several components (e.g., hardware components, including antennas, RF chains, power amplifiers, modulators, buffers, (all) processors, interleavers, adders, or summers) for analog and digital purposes. The various aspects described herein are intended to be practiced in various devices, components, systems, distributed arrangements, or end-user devices of various sizes, shapes, and configurations. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to understand the above-stated features of the present disclosure in detail, the above briefly summarized content may be described in more detail with reference to various aspects, some of which are illustrated in the accompanying drawings. However, it should be noted that the accompanying drawings only illustrate certain typical aspects of the present disclosure and should not be considered to limit its scope, as the description may allow for other equally effective aspects. The same reference numerals in different drawings may identify the same or similar elements.

[0023] Figure 1 is a diagram illustrating an example of a wireless network according to the present disclosure.

[0024] Figure 2 is a diagram illustrating an example in which a base station and a user equipment (UE) are in communication in a wireless network according to the present disclosure.

[0025] Figures 3A-3C is a diagram illustrating an example of zone-based sidelink time synchronization according to the present disclosure.

[0026] Figure 4 and Figure 5 is a diagram illustrating an example process performed, for example, by a UE according to the present disclosure.

[0027] Detailed Description

[0028] The various aspects of the present disclosure are described more fully below with reference to the accompanying drawings. However, the present disclosure can be implemented in many different forms and should not be interpreted as being limited to any specific structure or function given throughout the present disclosure. On the contrary, these aspects are provided to make the present disclosure thorough and complete, and it will fully convey the scope of the present disclosure to those skilled in the art. Based on the teachings of this article, those skilled in the art will appreciate that the scope of the present disclosure is intended to cover any aspect of the present disclosure disclosed herein, whether it is independently implemented or implemented in combination with any other aspect of the present disclosure. For example, any number of aspects set forth herein can be used to implement a device or practice method. In addition, the scope of the present disclosure is intended to cover such devices or methods practiced using supplements or other other structures, functionality, or structures and functionality as the various aspects of the present disclosure set forth herein. It should be understood that any aspect of the present disclosure disclosed herein can be implemented by one or more elements of the claims.

[0029] Several aspects of telecommunication systems will now be presented with reference to various devices and techniques. These devices and techniques will be described in the following detailed description and illustrated in the accompanying drawings by various blocks, modules, components, circuits, steps, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using hardware, software, or a combination thereof. Whether such elements are implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system.

[0030] It should be noted that while various aspects may be described herein using terminology generally associated with 5G or NR radio access technologies (RATs), various aspects of the present disclosure may be applied to other RATs, such as 3G RATs, 4G RATs, and / or RATs after 5G (e.g., 6G).

[0031] Figure 1 1 is a diagram illustrating an example of a wireless network 100 according to the present disclosure. The wireless network 100 may be a 5G (NR) network and / or an LTE network, etc. or may include elements thereof. The wireless network 100 may include several base stations 110 (shown as BS110a, BS 110b, BS 110c, and BS 110d) and other network entities. A base station (BS) is an entity that communicates with a user equipment (UE) and may also be referred to as an NR BS, a B node, a gNB, a 5G B node (NB), an access point, a transmit receive point (TRP), etc. Each BS may provide communication coverage for a specific geographic area. In 3GPP, the term "cell" may refer to a coverage area of ​​a BS and / or a BS subsystem serving the coverage area, depending on the context in which the term is used.

[0032] A BS may provide communication coverage for a macro cell, a pico cell, a femto cell, and / or another type of cell. A macro cell may cover a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access by UEs with service subscriptions. A pico cell may cover a relatively small geographic area and may allow unrestricted access by UEs with service subscriptions. A femto cell may cover a relatively small geographic area (e.g., a residence) and may allow restricted access by UEs associated with the femto cell (e.g., UEs in a closed subscriber group (CSG)). A BS for a macro cell may be referred to as a macro BS. A BS for a pico cell may be referred to as a pico BS. A BS for a femto cell may be referred to as a femto BS or a home BS. In Figure 1 In the example shown in , BS 110a may be a macro BS for macro cell 102a, BS 110b may be a pico BS for pico cell 102b, and BS 110c may be a femto BS for femto cell 102c. The BS may support one or more (e.g., three) cells. The terms "eNB", "base station", "NR BS", "gNB", "TRP", "AP", "B node", "5G NB", and "cell" may be used interchangeably herein.

[0033] In some aspects, the cell may not necessarily be stationary, and the geographic area of ​​the cell may move depending on the location of the mobile BS. In some aspects, the BSs may be interconnected to each other and / or to one or more other BSs or network nodes (not shown) in the wireless network 100 via various types of backhaul interfaces, such as direct physical connections or virtual networks, using any suitable transport network.

[0034] The wireless network 100 may also include a relay station. A relay station is an entity that can receive transmissions of data from an upstream station (e.g., a BS or a UE) and send transmissions of the data to a downstream station (e.g., a UE or a BS). A relay station may also be a UE that can relay transmissions for other UEs. Figure 1 In the example shown in , relay BS 110d may communicate with macro BS 110a and UE 120d to facilitate communication between BS 110a and UE 120d. A relay BS may also be referred to as a relay station, relay base station, relay, or the like.

[0035] The wireless network 100 may be a heterogeneous network including different types of BSs, such as a macro BS, a pico BS, a femto BS, a relay BS, etc. These different types of BSs may have different transmit power levels, different coverage areas, and different effects on interference in the wireless network 100. For example, a macro BS may have a high transmit power level (e.g., 5 to 40 watts), while a pico BS, a femto BS, and a relay BS may have a lower transmit power level (e.g., 0.1 to 2 watts).

[0036] A network controller 130 may be coupled to a set of BSs and may provide coordination and control of these BSs. The network controller 130 may communicate with each BS via a backhaul. The BSs may also communicate with each other directly or indirectly via a wireless or wired backhaul.

[0037] UEs 120 (e.g., 120a, 120b, 120c) may be dispersed throughout the wireless network 100, and each UE may be stationary or mobile. UEs may also be referred to as access terminals, terminals, mobile stations, subscriber units, stations, etc. A UE may be a cellular phone (e.g., a smart phone), a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld device, a laptop computer, a cordless phone, a wireless local loop (WLL) station, a tablet, a camera, a gaming device, a netbook, a smartbook, an ultrabook, a medical device or equipment, a biometric sensor / device, a wearable device (smart watch, smart clothing, smart glasses, smart wristband, smart jewelry (e.g., smart ring, smart bracelet)), an entertainment device (e.g., a music or video device, or a satellite radio), a vehicle component or sensor, a smart meter / sensor, an industrial manufacturing equipment, a global positioning system device, or any other suitable device configured to communicate via a wireless or wired medium.

[0038] Some UEs may be considered as machine type communication (MTC) UEs, or evolved or enhanced machine type communication (eMTC) UEs. MTC and eMTC UEs include, for example, robots, drones, remote devices, sensors, meters, monitors, and / or location tags, which may communicate with a base station, another device (e.g., a remote device), or some other entity. A wireless node may provide connectivity to or to a network (e.g., a wide area network (such as the Internet) or a cellular network) via, for example, a wired or wireless communication link. Some UEs may be considered as Internet of Things (IoT) devices, and / or may be implemented as NB-IoT (narrowband Internet of Things) devices. Some UEs may be considered as client equipment (CPE). UE 120 may be included inside a housing that houses components of UE 120, such as a processor component and / or a memory component. In some aspects, a processor component and a memory component may be coupled together. For example, a processor component (e.g., one or more processors) and a memory component (e.g., a memory) may be operationally coupled, communicatively coupled, electronically coupled, and / or electrically coupled.

[0039] In general, any number of wireless networks may be deployed in a given geographic area. Each wireless network may support a specific RAT and may operate on one or more frequencies. RAT may also be referred to as radio technology, air interface, etc. Frequency may also be referred to as carrier, frequency channel, etc. Each frequency may support a single RAT in a given geographic area to avoid interference between wireless networks of different RATs. In some cases, NR or 5G RAT networks may be deployed.

[0040] In some aspects, two or more UEs 120 (e.g., shown as UE 120a and UE 120e) may communicate directly (e.g., without using base station 110 as an intermediary to communicate with each other) using one or more sidelink channels. For example, UE 120 may communicate using peer-to-peer (P2P) communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) protocols (e.g., which may include vehicle-to-vehicle (V2V) protocols or vehicle-to-infrastructure (V2I) protocols), and / or mesh networks. In this case, UE 120 may perform scheduling operations, resource selection operations, and / or other operations described elsewhere herein as being performed by base station 110.

[0041] The devices of the wireless network 100 can communicate using an electromagnetic spectrum, which can be subdivided into various categories, frequency bands, channels, etc. based on frequency or wavelength. For example, the devices of the wireless network 100 can communicate using an operating frequency band having a first frequency range (FR1) that can span from 410 MHz to 7.125 GHz, and / or can communicate using an operating frequency band having a second frequency range (FR2) that can span from 24.25 GHz to 52.6 GHz. Frequencies between FR1 and FR2 are sometimes referred to as mid-band frequencies. Although a portion of FR1 is greater than 6 GHz, FR1 is often referred to as a "sub-6 GHz band". Similarly, FR2 is often referred to as a "millimeter wave" band, although it is different from the extremely high frequency (EHF) band (30 GHz–300 GHz) identified as a "millimeter wave" band by the International Telecommunication Union (ITU). Therefore, unless otherwise specifically stated, it should be understood that, if used herein, the term sub-"6 GHz" or the like can broadly represent frequencies less than 6 GHz, frequencies within FR1, and / or mid-band frequencies (e.g., greater than 7.125 GHz). Similarly, unless otherwise specifically stated, it should be understood that the term "millimeter wave" and the like, if used herein, can broadly refer to frequencies within the EHF band, frequencies within FR2, and / or mid-band frequencies (e.g., less than 24.25 GHz). It is contemplated that the frequencies included in FR1 and FR2 can be modified, and the techniques described herein are applicable to those modified frequency ranges.

[0042] As indicated above, Figure 1 are provided as examples. Other examples may differ from those described in Figure 1 Examples described.

[0043] Figure 2is a diagram illustrating an example 200 of a base station 110 and a UE 120 in communication in a wireless network 100 according to the present disclosure. The base station 110 may be equipped with T antennas 234a through 234t, and the UE 120 may be equipped with R antennas 252a through 252r, where in general T≥1 and R≥1.

[0044] At the base station 110, the transmit processor 220 may receive data for one or more UEs from the data source 212, select one or more modulation and coding schemes (MCS) for each UE based at least in part on a channel quality indicator (CQI) received from the UE, process (e.g., encode and modulate) the data for the UE based at least in part on the MCS selected for each UE, and provide data symbols for all UEs. The transmit processor 220 may also process system information (e.g., for semi-static resource partitioning information (SRPI)) and control information (e.g., CQI requests, grants, and / or upper layer signaling), and provide overhead symbols and control symbols. The transmit processor 220 may also generate reference symbols for reference signals (e.g., cell-specific reference signals (CRS) or demodulation reference signals (DMRS)) and synchronization signals (e.g., primary synchronization signals (PSS) or secondary synchronization signals (SSS)). A transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on ​​data symbols, control symbols, overhead symbols, and / or reference symbols, where applicable, and may provide T output symbol streams to T modulators (MODs) 232a through 232t. Each modulator 232 may process a respective output symbol stream (e.g., for OFDM) to obtain an output sample stream. Each modulator 232 may further process (e.g., convert to analog, amplify, filter, and upconvert) the output sample stream to obtain a downlink signal. The T downlink signals from modulators 232a through 232t may be transmitted via T antennas 234a through 234t, respectively.

[0045] At UE 120, antennas 252a to 252r may receive downlink signals from base station 110 and / or other base stations and may provide received signals to demodulators (DEMODs) 254a to 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, downconvert, and digitize) the received signal to obtain input samples. Each demodulator 254 may further process the input samples (e.g., for OFDM) to obtain received symbols. A MIMO detector 256 may obtain received symbols from all R demodulators 254a to 254r, perform MIMO detection on the received symbols where applicable, and provide detected symbols. A receive processor 258 may process (e.g., demodulate and decode) the detected symbols, provide decoded data for UE 120 to a data sink 260, and provide decoded control information and system information to a controller / processor 280. The term "controller / processor" may refer to one or more controllers, one or more processors, or a combination thereof. The channel processor may determine a reference signal received power (RSRP) parameter, a received signal strength indicator (RSSI) parameter, a reference signal received quality (RSRQ) parameter, and / or a CQI parameter, etc. In some aspects, one or more components of the UE 120 may be included in the housing 284 .

[0046] The network controller 130 may include a communication unit 294, a controller / processor 290, and a memory 292. The network controller 130 may include, for example, one or more devices in a core network. The network controller 130 may communicate with the base station 110 via the communication unit 294.

[0047] Antennas (e.g., antennas 234a to 234t and / or antennas 252a to 252r) may include, or may be included within, one or more antenna panels, antenna groups, antenna element sets, and / or antenna arrays, etc. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include one or more antenna elements. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include coplanar antenna element sets and / or non-coplanar antenna element sets. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include antenna elements within a single housing and / or antenna elements within multiple housings. Antenna panels, antenna groups, antenna element sets, and / or antenna arrays may include antenna elements coupled to one or more transmission and / or reception components (such as Figure 2 One or more antenna elements of one or more components).

[0048] On the uplink, at the UE 120, a transmit processor 264 may receive and process data from a data source 262 and control information (e.g., for reports including RSRP, RSSI, RSRQ, and / or CQI) from a controller / processor 280. The transmit processor 264 may also generate reference symbols for one or more reference signals. The symbols from the transmit processor 264 may be precoded by a TX MIMO processor 266, where applicable, further processed by modulators 254a through 254r (e.g., for DFT-s-OFDM or CP-OFDM), and transmitted to the base station 110. In some aspects, the modulator and demodulator (e.g., MOD / DEMOD 254) of the UE 120 may be included in a modem of the UE 120. In some aspects, the UE 120 includes a transceiver. The transceiver may include any combination of antenna(s) 252, modulator and / or demodulator 254, MIMO detector 256, receive processor 258, transmit processor 264, and / or TX MIMO processor 266. The transceiver may be used by a processor (e.g., controller / processor 280) and memory 282 to perform aspects of any of the methods described herein (e.g., as described with reference to Figures 3A-3C , 4 and / or 5).

[0049] At the base station 110, uplink signals from the UE 120 and other UEs may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236 where applicable, and further processed by the receive processor 238 to obtain decoded data and control information sent by the UE 120. The receive processor 238 may provide the decoded data to the data sink 239 and the decoded control information to the controller / processor 240. The base station 110 may include a communication unit 244 and communicate with the network controller 130 via the communication unit 244. The base station 110 may include a scheduler 246 to schedule the UE 120 for downlink and / or uplink communications. In some aspects, the modulator and demodulator (e.g., MOD / DEMOD 232) of the base station 110 may be included in a modem of the base station 110. In some aspects, the base station 110 includes a transceiver. The transceiver may include any combination of antenna(s) 234, modulator and / or demodulator 232, MIMO detector 236, receive processor 238, transmit processor 220, and / or TX MIMO processor 230. The transceiver may be used by a processor (e.g., controller / processor 240) and memory 242 to perform aspects of any of the methods described herein (e.g., as described with reference to Figures 3A-3C , 4 and / or 5).

[0050] The controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component(s) of the base station 110 may perform one or more techniques associated with zone-based sidelink time synchronization, as described in more detail elsewhere herein. For example, the controller / processor 240 of the base station 110, the controller / processor 280 of the UE 120, and / or Figure 2 Any other component of the Figure 4 The process of 400 Figure 5 , and / or operations of other processes as described herein. Memories 242 and 282 may store data and program codes for base station 110 and UE 120, respectively. In some aspects, memory 242 and / or memory 282 may include: a non-transitory computer-readable medium storing one or more instructions (e.g., code and / or program code) for wireless communication. For example, the one or more instructions, when executed (e.g., directly, or after compilation, conversion, and / or interpretation) by one or more processors of base station 110 and / or UE 120, may cause the one or more processors, UE 120, and / or base station 110 to perform or direct, for example Figure 4 The process of 400 Figure 5 In some aspects, executing instructions may include running instructions, converting instructions, compiling instructions, and / or interpreting instructions, among other aspects.

[0051] In some aspects, the first UE 120 may include: a device for determining whether to transmit a sidelink timing synchronization signal to the second UE 120 based at least in part on a sidelink zone in which the first UE 120 is located and a sidelink zone in which the second UE 120 is located; a device for selectively transmitting a sidelink timing synchronization signal to the second UE 120 based at least in part on the determination of whether to transmit the sidelink timing synchronization signal to the second UE 120, and the like. In some aspects, the first UE 120 may include: a device for determining whether the second UE 120 is to transmit a sidelink timing synchronization signal to the first UE 120 based at least in part on a sidelink zone in which the first UE 120 is located and a sidelink zone in which the second UE 120 is located; a device for selectively receiving a sidelink timing synchronization signal from the second UE 120 based at least in part on the determination of whether the second UE 120 is to transmit the sidelink timing synchronization signal to the first UE 120, and the like. In some aspects, such a device may include a device for determining whether to transmit a sidelink timing synchronization signal to the second UE 120 based at least in part on the determination of whether the second UE 120 is to transmit the sidelink timing synchronization signal to the first UE 120, and the like. Figure 2One or more components of UE 120 are depicted, such as controller / processor 280, transmit processor 264, TX MIMO processor 266, MOD 254, antenna 252, DEMOD 254, MIMO detector 256, receive processor 258, and the like.

[0052] although Figure 2 The blocks in the 200 and 210 are illustrated as different components, but the functions described above with respect to these blocks may be implemented with a single hardware, software, or combined component or a combination of various components. For example, the functions described with respect to the transmit processor 264, the receive processor 258, and / or the TX MIMO processor 266 may be performed by or under the control of the controller / processor 280.

[0053] As indicated above, Figure 2 are provided as examples. Other examples may differ from those described in Figure 2 Examples described.

[0054] As indicated above, in some cases, two or more UEs may communicate directly via a side link. For example, a first UE may transmit one or more side link communications to a second UE on a side link and / or may receive one or more side link communications from a second UE on a side link. Due to the distance between the first UE and the second UE, a propagation delay may occur between the first UE and the second UE. The propagation delay of the physical signal carrying the side link communication transmitted between the first UE and the second UE may cause the side link communication to be received at a certain time after the side link communication is transmitted. Accordingly, the first UE and the second UE may be time synchronized to account for the propagation delay between the first UE and the second UE.

[0055] In some cases, the effectiveness of time synchronization between the first UE and the second UE may be based at least in part on the cyclic prefix duration used for the side link. The cyclic prefix may be based at least in part on the subcarrier spacing on the side link. For example, the cyclic prefix duration used by the first UE and the second UE may be around 1 microsecond (μs) for a 60 kilohertz (kHz) subcarrier spacing, 0.5 μs for a 120kHz subcarrier spacing, and so on. In some cases, the propagation delay between the first UE and the second UE may be absorbed by the cyclic prefix duration on the side link. However, in other cases, the propagation delay between the first UE and the second UE may be longer than the cyclic prefix on the side link, in which case the first UE and the second UE may use time synchronization to account for the propagation delay.

[0056] Some aspects described herein provide techniques and apparatus for zone-based sidelink time synchronization. In some aspects, a geographic area may be divided into multiple sidelink zones. These sidelink zones may be configured in the following manner: the approximate distance between the UEs permitted is determined at least in part based on the sidelink zones in which the UEs are located. In this way, the UEs may use these sidelink zones for time synchronization.

[0057] For example, the first UE and the second UE may determine whether to transmit a side link timing synchronization signal based at least in part on the side link partition in which the first UE is located and the side link partition in which the second UE is located. Tables, standards, specifications, configurations stored by the first UE and the second UE, and / or other data structures may identify various side link partition combinations and whether to transmit a side link timing synchronization signal for each of these side link partition combinations. These side link partition combinations may be configured at least in part based on the distance between the side link partitions included in these side link partition combinations. In this way, side link partitions that are far apart or at a distance that satisfies a distance threshold may be configured for the transmission of a side link timing synchronization signal. On the contrary, side link partitions that are close together (or the same side link partitions) may not be configured for the transmission of a side link timing synchronization signal.

[0058] In this way, the first UE and the second UE can identify the combination of the sidelink zone in which the first UE is located and the sidelink zone in which the second UE is located, and can determine whether the combination is configured for the transmission of the sidelink timing synchronization signal. This allows the first UE and the second UE to quickly determine whether to transmit the sidelink timing synchronization signal, allows the first UE and the second UE to perform time synchronization in a specific scenario, and allows the first UE and the second UE to save processing, memory, battery and radio resources by suppressing time synchronization in other scenarios, etc.

[0059] Figures 3A-3C is a diagram illustrating one or more examples 300 of zone-based sidelink time synchronization according to various aspects of the present disclosure. Figures 3A-3C As shown in , (each) example 300 may include communication between multiple UEs, such as UE1 (e.g., UE 120) and UE2 (e.g., another UE 120). The UEs can communicate via a wireless side link. In some aspects, the UEs can be included in a wireless network, such as wireless network 100. In some aspects, one or more of the UEs are located outside the coverage area of ​​the wireless network.

[0060] like Figure 3AAs shown in , a geographic area can be divided into multiple contiguous side link zones. Each of these side link zones can be a specific size and shape. In some aspects, these side link zones can be the same size and shape. In some aspects, the size and / or shape of at least a subset of these side link zones are different. 3A illustrates an example in which the shape of the side link zone is square and the width is 50 meters. However, the side link zones can use other than Figure 3A The invention may be implemented in many different types of shapes, sizes and / or configurations beyond the sizes, shapes and configurations illustrated in the examples.

[0061] like Figure 3A As further shown in , each of these side link zones can be assigned an identifier so that these side link zones can be indexed in a table, wireless communication standard, data structure, wireless communication specification, etc. The identifiers assigned to these side link zones can be numbered identifiers (e.g., side link zone 0 to side link zone 11), lettered identifiers (e.g., side link zone A to side link zone G), or other types of identifiers. In some aspects, the identifiers for the side link zones can be repeated after a certain number of identifiers are used so that the number of identifiers in use can be reduced while still permitting the side link zones to be uniquely identified within a portion of a geographic area.

[0062] The size and shape of each sidelink zone may be a known and well-defined configuration such that the use of the sidelink zones allows for distance determination between two UEs. Specifically, the distance between two UEs is determined based at least in part on the number of sidelink zones between the two UEs. For example, Figure 3A The distance between UE1 and UE2 illustrated in the figure may be determined at least in part based on UE1 being in sidelink zone 1 and UE2 being in sidelink zone 7, at least in part based on sidelink zone 4 being between sidelink zone 1 and sidelink zone 7, at least in part based on the size and shape of sidelink zones 1, 4, and 7, etc. In some aspects, the distance between UEs determined at least in part based on the sidelink zones may be used for timing synchronization between the UEs.

[0063] As in Figure 3BIn the figure and as shown by reference numeral 302a, UE1 can determine whether to transmit a sidelink timing synchronization signal to UE2 based at least in part on the sidelink zone in which UE1 is located and the sidelink zone in which UE2 is located. As shown by reference numeral 302b, UE2 can determine whether UE1 is to transmit a sidelink timing synchronization signal to UE2 based at least in part on the sidelink zone in which UE1 is located and the sidelink zone in which UE2 is located. The sidelink timing synchronization signal (which may also be referred to as a time tracking reference signal) may be a signal transmitted for the purpose of determining a propagation delay between two UEs. A UE that receives a sidelink timing synchronization signal may know the time when the sidelink timing synchronization signal is transmitted, and may determine the propagation delay based at least in part on the time duration between the time when the sidelink timing synchronization signal is transmitted and the time when the sidelink timing synchronization signal is received.

[0064] UE1 and UE2 may determine whether the sidelink timing synchronization signal is transmitted at various times and / or at least partially based on various events. For example, UE1 and UE2 may determine whether the sidelink timing synchronization signal is transmitted based at least in part on the communication connection between UE1 and UE2. As another example, UE1 and UE2 may determine whether the sidelink timing synchronization signal is transmitted at specific time intervals. As another example, UE1 and UE2 may determine whether the sidelink timing synchronization signal is transmitted based at least in part on the movement of UE1 and / or UE2 to another sidelink zone.

[0065] In some aspects, UE1 determines the sidelink zone in which UE1 is located based at least in part on determining the geographic location of UE1 and identifying the sidelink zone that includes UE1. Similarly, UE2 may determine the sidelink zone in which UE2 is located based at least in part on determining the geographic location of UE2 and identifying the sidelink zone that includes UE2.

[0066] In some aspects, UE1 determines the sidelink zone in which UE2 is located based at least in part on signaling from UE2. For example, UE2 may transmit a sidelink communication to UE1 that identifies the sidelink zone in which UE2 is located. Similarly, UE2 determines the sidelink zone in which UE1 is located based at least in part on signaling from UE1. In some aspects, UE1 transmits updates to UE2 about the sidelink zone in which UE1 is located. For example, UE1 may transmit periodic updates, may transmit updates based at least in part on events associated with UE1 (e.g., based at least in part on UE1 moving to a new sidelink zone), and so on. UE2 may transmit updates to UE1 in a similar manner.

[0067] In some aspects, UE1 and UE2 may determine whether a sidelink timing synchronization signal is to be transmitted based at least in part on a combination of a sidelink zone in which UE1 is located and a sidelink zone in which UE2 is located. In these situations, various sidelink zone combinations may be configured using the transmission of a sidelink timing synchronization signal or not. Accordingly, UE1 may determine whether to transmit a sidelink timing synchronization signal to UE2 based at least in part on whether a combination of a sidelink zone in which UE1 is located and a sidelink zone in which UE2 is located is configured for the transmission of a sidelink timing synchronization signal. Similarly, UE2 may determine whether UE1 is to transmit a sidelink timing synchronization signal to UE2 based at least in part on whether a combination of a sidelink zone in which UE1 is located and a sidelink zone in which UE2 is located is configured for the transmission of a sidelink timing synchronization signal.

[0068] In some aspects, a data structure (such as a table, a wireless communication standard, a data structure, a wireless communication specification, and / or another type of data structure) may be configured with information identifying a plurality of configured sidelink zone combinations and information identifying whether a sidelink timing synchronization signal is to be transmitted for each of the configured sidelink zone combinations. For example, the data structure may include information identifying a combination of sidelink zone 0 and sidelink zone 1 to sidelink zone 0 and sidelink zone 11, sidelink zone 1 and sidelink zone 2 to sidelink zone 1 and sidelink zone 11, and so on. In some cases, UE1 and UE2 may determine whether a sidelink timing synchronization signal is to be transmitted by identifying information in the data structure identifying a combination of a sidelink zone in which UE1 is located and a sidelink zone in which UE2 is located and determining whether the data structure indicates that a sidelink timing synchronization signal is to be transmitted for the combination.

[0069] As in Figure 3C , and as indicated by reference numeral 304a, UE1 may selectively transmit a sidelink timing synchronization signal to UE2 based at least in part on determining whether to transmit the sidelink timing synchronization signal to UE2. As indicated by reference numeral 304b, UE2 may selectively receive a sidelink timing synchronization signal from UE1 based at least in part on determining whether UE1 is to transmit the sidelink timing synchronization signal to UE2.

[0070] For example, UE1 may determine that a sidelink timing synchronization signal is to be transmitted to UE2, and may transmit the sidelink timing synchronization signal to UE2 based at least in part on the determination that the sidelink timing synchronization signal is to be transmitted to UE2. UE2 may determine that UE1 is to transmit a sidelink timing synchronization signal to UE2, and may monitor and receive the sidelink timing synchronization signal from UE1 based at least in part on the determination that UE1 is to transmit the sidelink timing synchronization signal to UE2. In these scenarios, UE1 and UE2 may use the sidelink timing synchronization signal to time synchronize transmission and reception on the sidelink.

[0071] As another example, UE1 may determine to refrain from transmitting a sidelink timing synchronization signal to UE2, and may refrain from transmitting the sidelink timing synchronization signal to UE2 based at least in part on the determination to refrain from transmitting the sidelink timing synchronization signal to UE2. UE2 may determine that UE1 is to refrain from transmitting a sidelink timing synchronization signal to UE2, and may refrain from monitoring and receiving the sidelink timing synchronization signal from UE1 based at least in part on the determination that UE1 is to refrain from transmitting the sidelink timing synchronization signal to UE2. In these scenarios, UE1 and UE2 may refrain from using the sidelink timing synchronization signal, which saves processing, memory, battery, and radio resources of UE1 and UE2.

[0072] In some aspects, if UE1 and UE2 determine that a sidelink timing synchronization signal is to be transmitted, UE1 and UE2 may identify one or more parameters for transmission of the sidelink timing synchronization signal. UE1 may transmit the sidelink timing synchronization signal based at least in part on the one or more parameters. UE2 may receive (e.g., monitor, identify, demodulate, decode, etc.) the sidelink timing synchronization signal based at least in part on the one or more parameters.

[0073] For example, the one or more parameters may indicate a bandwidth (e.g., a frequency bandwidth) of the sidelink timing synchronization signal. In these cases, UE1 may transmit the sidelink timing synchronization signal in the bandwidth indicated by the one or more parameters. In addition, UE2 may monitor the sidelink timing synchronization signal in the bandwidth indicated by the one or more parameters.

[0074] As another example, the one or more parameters may indicate a number of repetitions of the sidelink timing synchronization signal. In these situations, UE1 may transmit the sidelink timing synchronization signal with the number of repetitions indicated by the one or more parameters. In addition, UE2 may monitor, demodulate, and decode the sidelink timing synchronization signal with the number of repetitions indicated by the one or more parameters.

[0075] As another example, the one or more parameters may indicate a waveform type of the sidelink timing synchronization signal. The waveform type of the sidelink timing synchronization signal may include a multi-carrier waveform (e.g., a universal filtered multi-carrier (UFMC) waveform, a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform, a filter bank multi-carrier (FBMC) waveform, a generalized frequency division multiplexing (GFDM) waveform, etc.), a single-carrier waveform (e.g., a single-carrier quadrature amplitude modulation (SC-QAM) waveform, a single-carrier frequency division multiplexing (SC-FDM) waveform, etc.), or another waveform type. In these situations, UE1 may use the waveform type indicated by the one or more parameters to transmit the sidelink timing synchronization signal. In addition, UE2 may demodulate and / or decode the sidelink timing synchronization signal based at least in part on the waveform type indicated by the one or more parameters.

[0076] As another example, the one or more parameters may indicate a time domain mode and / or frequency domain mode for a sidelink timing synchronization signal. The time domain mode may indicate a resource element or symbol interval in the time domain for the sidelink timing synchronization signal, may identify a time domain resource for the sidelink timing synchronization signal, and so on. The frequency domain mode may indicate a resource element interval in the frequency domain for the sidelink timing synchronization signal, may identify a frequency domain resource for the sidelink timing synchronization signal, and so on. In these situations, UE1 may transmit a sidelink timing synchronization signal based at least in part on the time domain mode and / or frequency domain mode indicated by the one or more parameters. In addition, UE2 may monitor, demodulate, and decode the sidelink timing synchronization signal based at least in part on the time domain mode and / or frequency domain mode indicated by the one or more parameters.

[0077] As another example, the one or more parameters may indicate a sequence length for the sidelink timing synchronization signal. In these cases, UE1 may encode, modulate, and transmit the sidelink timing synchronization signal based at least in part on the sequence length indicated by the one or more parameters. In addition, UE2 may demodulate and decode the sidelink timing synchronization signal based at least in part on the sequence length indicated by the one or more parameters.

[0078] As another example, the one or more parameters may indicate a root sequence for a sidelink timing synchronization signal. The root sequence may include a Zadoff-Chu root sequence, a Gold root sequence, a binary sequence, or another type of sequence. In these cases, UE1 may encode, modulate, and transmit the sidelink timing synchronization signal based at least in part on the root sequence indicated by the one or more parameters. In addition, UE2 may demodulate and decode the sidelink timing synchronization signal based at least in part on the root sequence indicated by the one or more parameters.

[0079] As another example, the one or more parameters may indicate a cyclic shift for a sidelink timing synchronization signal. The cyclic shift may be used to shift a root sequence for a sidelink timing synchronization signal to maintain orthogonality between different transmissions of the sidelink timing synchronization signal and / or between the transmission of the sidelink timing synchronization signal and other sidelink transmissions. In these situations, UE1 may encode, modulate, and transmit the sidelink timing synchronization signal based at least in part on the cyclic shift indicated by the one or more parameters. In addition, UE2 may demodulate and decode the sidelink timing synchronization signal based at least in part on the cyclic shift indicated by the one or more parameters.

[0080] As another example, the one or more parameters may indicate which UE of UE1 and UE2 is to transmit the sidelink timing synchronization signal. For example, the one or more parameters may indicate that the UE with the lowest sidelink zone identifier in the sidelink zone is to transmit the sidelink timing synchronization signal. As another example, the one or more parameters may indicate that the UE located in a specific sidelink zone is to transmit the sidelink timing synchronization signal. As another example, the one or more parameters may indicate that both UEs are to transmit the sidelink timing synchronization signal.

[0081] In some aspects, the one or more parameters for the sidelink timing synchronization signal can be configured for different configured sidelink zone combinations. In this way, each configured sidelink zone combination can be configured with a specific combination of parameters for the sidelink timing synchronization signal to account for the distance between the sidelink zones in the configured combination, the channel conditions within and between the sidelink zones in the configured combination, and / or other factors.

[0082] In some aspects, a parameter combination for each configured sidelink zone combination is identified in a data structure (e.g., the above data structure or another data structure), such as a table, a wireless communication standard, a wireless communication specification, a configuration stored by UE1 and UE2, etc. Accordingly, UE1 and UE2 can identify a specific parameter combination for a sidelink timing synchronization signal to be transmitted between UE1 and UE2 based at least in part on the combination of the sidelink zone in which UE1 is located and the sidelink zone in which UE2 is located. For example, UE1 and UE2 can identify information in the data structure that identifies the combination of the sidelink zone in which UE1 is located and the sidelink zone in which UE2 is located, and can identify a specific parameter combination in the data structure for the sidelink timing synchronization signal associated with the combination.

[0083] In this way, UE1 and UE2 can identify the combination of the sidelink zone in which UE1 is located and the sidelink zone in which UE2 is located, and can determine whether the combination is configured for transmission of the sidelink timing synchronization signal. This allows UE1 and UE2 to quickly determine whether to transmit the sidelink timing synchronization signal, allows UE1 and UE2 to perform time synchronization in specific scenarios, and allows UE1 and UE2 to save processing, memory, battery and radio resources by suppressing time synchronization in other scenarios, etc.

[0084] As indicated above, Figures 3A-3C Provided as one or more examples. Other examples may differ from those regarding Figures 3A-3C Examples described.

[0085] Figure 4 4 is a diagram illustrating an example process 400 performed, for example, by a first UE according to various aspects of the present disclosure. The example process 400 is a diagram in which the first UE (above Figure 1 , 2 and / or UE 120 illustrated and described in 3A-3C, etc.) perform examples of operations associated with zone-based sidelink time synchronization.

[0086] like Figure 4 As shown, in some aspects, process 400 may include determining whether to transmit a sidelink timing synchronization signal to a second UE based at least in part on a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located (block 410). For example, the first UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may determine whether to transmit a sidelink timing synchronization signal to a second UE based at least in part on a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located, as described above.

[0087] like Figure 4 As further shown in FIG. 4 , in some aspects, process 400 may include selectively transmitting a sidelink timing synchronization signal to a second UE based at least in part on determining whether to transmit the sidelink timing synchronization signal to the second UE (block 420). For example, a first UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may selectively transmit a sidelink timing synchronization signal to a second UE based at least in part on determining whether to transmit the sidelink timing synchronization signal to the second UE, as described above.

[0088] Process 400 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in combination with one or more other processes described elsewhere herein.

[0089] In a first aspect, process 400 includes determining one or more parameters for a sidelink timing synchronization signal based at least in part on a sidelink zone in which a first UE is located and a sidelink zone in which a second UE is located. In a second aspect, alone or in combination with the first aspect, the one or more parameters for the sidelink timing synchronization signal include at least one of the following: a bandwidth of the sidelink timing synchronization signal, a number of repetitions of the sidelink timing synchronization signal, a waveform type of the sidelink timing synchronization signal, a time domain mode of the sidelink timing synchronization signal, a frequency domain mode of the sidelink timing synchronization signal, a sequence length of the sidelink timing synchronization signal, a root sequence of the sidelink timing synchronization signal, or a cyclic shift of the sidelink timing synchronization signal.

[0090] In a third aspect, alone or in combination with one or more of the first to second aspects, determining the one or more parameters for the sidelink timing synchronization signal includes: identifying a combination of a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located from a plurality of configured sidelink zone combinations; and identifying a specific combination of the one or more parameters for the sidelink timing synchronization signal associated with the combination. In a fourth aspect, alone or in combination with one or more of the first to third aspects, identifying a specific combination of the one or more parameters for the sidelink timing synchronization signal associated with the combination includes: identifying the specific combination of the one or more parameters for the sidelink timing synchronization signal based at least in part on at least one of the following: a table, a standard, a specification, or a configuration stored by the first UE.

[0091] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, determining whether to transmit the sidelink timing synchronization signal to the second UE includes: identifying a combination of a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located from a plurality of configured sidelink zone combinations; and determining whether to transmit the sidelink timing synchronization signal to the second UE based at least in part on whether the transmission of the sidelink timing synchronization signal is configured for the combination. In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, process 400 includes determining whether the transmission of the sidelink timing synchronization signal is configured for the combination based at least in part on at least one of the following: a table, a standard, a specification, or a configuration stored by the first UE.

[0092] In a seventh aspect, alone or in combination with one or more of the first to sixth aspects, determining whether to transmit the sidelink timing synchronization signal to the second UE includes: determining that the sidelink timing synchronization signal is to be transmitted to the second UE; and selectively transmitting the sidelink timing synchronization signal to the second UE includes: transmitting the sidelink timing synchronization signal to the second UE based at least in part on determining that the sidelink timing synchronization signal is to be transmitted to the second UE. In an eighth aspect, alone or in combination with one or more of the first to seventh aspects, determining whether to transmit the sidelink timing synchronization signal to the second UE includes: determining to suppress transmitting the sidelink timing synchronization signal to the second UE; and selectively transmitting the sidelink timing synchronization signal to the second UE includes: suppressing transmitting the sidelink timing synchronization signal to the second UE based at least in part on determining to suppress transmitting the sidelink timing synchronization signal to the second UE.

[0093] although Figure 4 An example block diagram of process 400 is shown, but in some aspects, process 400 may include Figure 4 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 400. Additionally or alternatively, two or more blocks of the process 400 may be executed in parallel.

[0094] Figure 5 5 is a diagram illustrating an example process 500 performed, for example, by a first UE according to various aspects of the present disclosure. The example process 500 is a diagram in which the first UE (above Figure 1 , 2 and / or UE 120 illustrated and described in 3A-3C, etc.) perform examples of operations associated with zone-based sidelink time synchronization.

[0095] like Figure 5 As shown, in some aspects, process 500 may include determining, based at least in part on the sidelink zone in which the first UE is located and the sidelink zone in which the second UE is located, whether the second UE is to transmit a sidelink timing synchronization signal to the first UE (block 510). For example, the first UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may determine, based at least in part on the sidelink zone in which the first UE is located and the sidelink zone in which the second UE is located, whether the second UE is to transmit a sidelink timing synchronization signal to the first UE, as described above.

[0096] like Figure 5As further shown in FIG. 5 , in some aspects, process 500 may include selectively receiving a sidelink timing synchronization signal from a second UE based at least in part on determining whether the second UE is to transmit the sidelink timing synchronization signal to the first UE (block 520). For example, the first UE (e.g., using receive processor 258, transmit processor 264, controller / processor 280, memory 282, etc.) may selectively receive the sidelink timing synchronization signal from the second UE based at least in part on determining whether the second UE is to transmit the sidelink timing synchronization signal to the first UE, as described above.

[0097] Process 500 may include additional aspects, such as any single aspect or any combination of aspects described below and / or in combination with one or more other processes described elsewhere herein.

[0098] In a first aspect, process 500 includes determining one or more parameters for a sidelink timing synchronization signal based at least in part on a sidelink zone in which a first UE is located and a sidelink zone in which a second UE is located. In a second aspect, alone or in combination with the first aspect, the one or more parameters for the sidelink timing synchronization signal include at least one of the following: a bandwidth of the sidelink timing synchronization signal, a number of repetitions of the sidelink timing synchronization signal, a waveform type of the sidelink timing synchronization signal, a time domain mode of the sidelink timing synchronization signal, a frequency domain mode of the sidelink timing synchronization signal, a sequence length of the sidelink timing synchronization signal, a root sequence of the sidelink timing synchronization signal, or a cyclic shift of the sidelink timing synchronization signal.

[0099] In a third aspect, alone or in combination with one or more of the first to second aspects, determining the one or more parameters for the sidelink timing synchronization signal includes: identifying a combination of a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located from a plurality of configured sidelink zone combinations; and identifying a specific combination of the one or more parameters for the sidelink timing synchronization signal associated with the combination. In a fourth aspect, alone or in combination with one or more of the first to third aspects, identifying a specific combination of the one or more parameters for the sidelink timing synchronization signal associated with the combination includes: identifying the specific combination of the one or more parameters for the sidelink timing synchronization signal based at least in part on at least one of the following: a table, a standard, a specification, or a configuration stored by the first UE.

[0100] In a fifth aspect, alone or in combination with one or more of the first to fourth aspects, determining whether the second UE is to transmit the sidelink timing synchronization signal to the first UE includes: identifying a combination of a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located from a plurality of configured sidelink zone combinations; and determining whether the second UE is to transmit the sidelink timing synchronization signal to the first UE based at least in part on whether the transmission of the sidelink timing synchronization signal is configured for the combination. In a sixth aspect, alone or in combination with one or more of the first to fifth aspects, process 500 includes determining whether the transmission of the sidelink timing synchronization signal is configured for the combination based at least in part on at least one of the following: a table, a standard, a specification, or a configuration stored by the first UE.

[0101] In the seventh aspect, alone or in combination with one or more of the first to sixth aspects, determining whether the second UE is to transmit the sidelink timing synchronization signal to the first UE includes: determining that the second UE is to transmit the sidelink timing synchronization signal to the first UE; and selectively receiving the sidelink timing synchronization signal from the second UE includes: receiving the sidelink timing synchronization signal from the second UE based at least in part on determining that the second UE is to transmit the sidelink timing synchronization signal to the first UE. In the eighth aspect, alone or in combination with one or more of the first to seventh aspects, determining whether the second UE is to transmit the sidelink timing synchronization signal to the first UE includes: determining that the second UE is to refrain from transmitting the sidelink timing synchronization signal to the first UE; and selectively receiving the sidelink timing synchronization signal from the second UE includes: refraining from receiving the sidelink timing synchronization signal from the second UE based at least in part on determining that the second UE is to refrain from transmitting the sidelink timing synchronization signal to the first UE.

[0102] although Figure 5 An example block diagram of process 500 is shown, but in some aspects, process 500 may include Figure 5 Additional blocks, fewer blocks, different blocks, or differently arranged blocks than those depicted in the process 500. Additionally or alternatively, two or more blocks of the process 500 may be executed in parallel.

[0103] The following provides an overview of some aspects of the disclosure:

[0104] Aspect 1: A wireless communication method performed by a user equipment (UE), comprising: determining whether to transmit a sidelink timing synchronization signal to a second UE based at least in part on a sidelink zone in which a first UE is located and a sidelink zone in which a second UE is located; and selectively transmitting the sidelink timing synchronization signal to the second UE based at least in part on determining whether to transmit the sidelink timing synchronization signal to the second UE.

[0105] Aspect 2: The method as described in Aspect 1, further comprising: determining one or more parameters for a sidelink timing synchronization signal based at least in part on a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located. Aspect 3: The method as described in Aspect 2, wherein the one or more parameters for the sidelink timing synchronization signal include at least one of the following: a bandwidth of the sidelink timing synchronization signal, a number of repetitions of the sidelink timing synchronization signal, a waveform type of the sidelink timing synchronization signal, a time domain mode of the sidelink timing synchronization signal, a frequency domain mode of the sidelink timing synchronization signal, a sequence length of the sidelink timing synchronization signal, a root sequence of the sidelink timing synchronization signal, or a cyclic shift of the sidelink timing synchronization signal.

[0106] Aspect 4: A method as described in Aspect 2 or 3, wherein determining the one or more parameters for the sidelink timing synchronization signal comprises: identifying a combination of a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located from a plurality of configured sidelink zone combinations; and identifying a specific combination of the one or more parameters for the sidelink timing synchronization signal associated with the combination. Aspect 5: A method as described in Aspect 4, wherein identifying a specific combination of the one or more parameters for the sidelink timing synchronization signal associated with the combination comprises: identifying the specific combination of the one or more parameters for the sidelink timing synchronization signal based at least in part on at least one of the following: a table, a standard, a specification, or a configuration stored by the first UE.

[0107] Aspect 6: A method as described in any one of Aspects 1-5, wherein determining whether to transmit the sidelink timing synchronization signal to the second UE comprises: identifying a combination of a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located from a plurality of configured sidelink zone combinations; and determining whether to transmit the sidelink timing synchronization signal to the second UE based at least in part on whether transmission of the sidelink timing synchronization signal is configured for the combination.

[0108] Aspect 7: The method of Aspect 6, further comprising: determining whether the transmission of the sidelink timing synchronization signal is configured for the combination based at least in part on at least one of: a table, a standard, a specification, or a configuration stored by the first UE. Aspect 8: The method of any one of Aspects 1-7, wherein determining whether to transmit the sidelink timing synchronization signal to the second UE comprises: determining that the sidelink timing synchronization signal is to be transmitted to the second UE; and wherein selectively transmitting the sidelink timing synchronization signal to the second UE comprises: transmitting the sidelink timing synchronization signal to the second UE based at least in part on determining that the sidelink timing synchronization signal is to be transmitted to the second UE.

[0109] Aspect 9: A method as described in any one of Aspects 1-8, wherein determining whether to transmit the sidelink timing synchronization signal to the second UE includes: determining to suppress transmitting the sidelink timing synchronization signal to the second UE; and wherein selectively transmitting the sidelink timing synchronization signal to the second UE includes: suppressing transmitting the sidelink timing synchronization signal to the second UE based at least in part on determining to suppress transmitting the sidelink timing synchronization signal to the second UE.

[0110] Aspect 10: A wireless communication method performed by a first user equipment (UE), comprising: determining whether the second UE is to transmit a sidelink timing synchronization signal to the first UE based at least in part on a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located; and selectively receiving the sidelink timing synchronization signal from the second UE based at least in part on determining whether the second UE is to transmit the sidelink timing synchronization signal to the first UE.

[0111] Aspect 11: The method as described in Aspect 10, further comprising: determining one or more parameters for the sidelink timing synchronization signal based at least in part on the sidelink zone in which the first UE is located and the sidelink zone in which the second UE is located. Aspect 12: The method as described in Aspect 11, wherein the one or more parameters for the sidelink timing synchronization signal include at least one of the following: a bandwidth of the sidelink timing synchronization signal, a number of repetitions of the sidelink timing synchronization signal, a waveform type of the sidelink timing synchronization signal, a time domain mode of the sidelink timing synchronization signal, a frequency domain mode of the sidelink timing synchronization signal, a sequence length of the sidelink timing synchronization signal, a root sequence of the sidelink timing synchronization signal, or a cyclic shift of the sidelink timing synchronization signal.

[0112] Aspect 13: A method as described in Aspect 11 or 12, wherein determining the one or more parameters for the sidelink timing synchronization signal includes: identifying a combination of a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located from a plurality of configured sidelink zone combinations; and identifying a specific combination of the one or more parameters for the sidelink timing synchronization signal associated with the combination. Aspect 14: A method as described in Aspect 13, wherein identifying a specific combination of the one or more parameters for the sidelink timing synchronization signal associated with the combination includes: identifying the specific combination of the one or more parameters for the sidelink timing synchronization signal based at least in part on at least one of the following: a table, a standard, a specification, or a configuration stored by the first UE.

[0113] Aspect 15: The method as described in any one of claims 10-14, wherein determining whether the second UE is to transmit the sidelink timing synchronization signal to the first UE comprises: identifying a combination of a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located from a plurality of configured sidelink zone combinations; and determining whether the second UE is to transmit the sidelink timing synchronization signal to the first UE based at least in part on whether the transmission of the sidelink timing synchronization signal is configured for the combination. Aspect 16: The method as described in Aspect 15, further comprising: determining whether the transmission of the sidelink timing synchronization signal is configured for the combination based at least in part on at least one of the following: a table, a standard, a specification, or a configuration stored by the first UE.

[0114] Aspect 17: The method as claimed in any one of claims 10-16, wherein determining whether the second UE is to transmit the sidelink timing synchronization signal to the first UE comprises: determining that the second UE is to transmit the sidelink timing synchronization signal to the first UE; and wherein selectively receiving the sidelink timing synchronization signal from the second UE comprises: receiving the sidelink timing synchronization signal from the second UE based at least in part on determining that the second UE is to transmit the sidelink timing synchronization signal to the first UE. Aspect 18: The method as claimed in any one of claims 10-17, wherein determining whether the second UE is to transmit the sidelink timing synchronization signal to the first UE comprises: determining that the second UE is to refrain from transmitting the sidelink timing synchronization signal to the first UE; and wherein selectively receiving the sidelink timing synchronization signal from the second UE comprises: refraining from receiving the sidelink timing synchronization signal from the second UE based at least in part on determining that the second UE is to refrain from transmitting the sidelink timing synchronization signal to the first UE.

[0115] Aspect 19: An apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions, the instructions being stored in the memory and executable by the processor so that the apparatus performs the method of one or more aspects of aspects 1 to 9. Aspect 20: An apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to perform the method of one or more aspects of aspects 1 to 9.

[0116] Aspect 21: A device for wireless communication, comprising at least one means for performing a method as in one or more aspects of aspects 1-9. Aspect 22: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform a method as in one or more aspects of aspects 1-9. Aspect 23: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions that, when executed by one or more processors of the device, cause the device to perform a method as in one or more aspects of aspects 1-9.

[0117] Aspect 24: An apparatus for wireless communication at a device, comprising: a processor; a memory coupled to the processor; and instructions, the instructions being stored in the memory and executable by the processor to cause the apparatus to perform a method as described in one or more aspects of aspects 10-18. Aspect 25: An apparatus for wireless communication, comprising a memory and one or more processors coupled to the memory, the memory and the one or more processors being configured to perform a method as described in one or more aspects of aspects 10-18.

[0118] Aspect 26: A device for wireless communication, comprising at least one means for performing a method as in one or more aspects of aspects 10-18. Aspect 27: A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to perform a method as in one or more aspects of aspects 10-18. Aspect 28: A non-transitory computer-readable medium storing an instruction set for wireless communication, the instruction set comprising one or more instructions that, when executed by one or more processors of a device, causes the device to perform a method as in one or more aspects of aspects 10-18.

[0119] The foregoing disclosure provides illustration and description, but is not intended to be exhaustive or to limit the aspects to the precise forms disclosed. Modifications and variations may be made in light of the above disclosure or may be acquired by practice of the various aspects.

[0120] As used herein, the term "component" is intended to be broadly interpreted as a combination of hardware and / or hardware and software. "Software" should be broadly interpreted as meaning instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, and / or functions, etc., whether it is described in software, firmware, middleware, microcode, hardware description language or other terms. As used herein, processors are implemented with hardware, and / or a combination of hardware and software. It will be obvious that the systems and / or methods described herein can be implemented in different forms of hardware, and / or a combination of hardware and software. The actual dedicated control hardware or software code for implementing these systems and / or methods does not limit various aspects. Thus, the operation and behavior of these systems and / or methods are described herein without reference to specific software codes--it is understood that software and hardware can be designed to implement these systems and / or methods based at least in part on the description herein.

[0121] As used herein, satisfying a threshold may refer to a value being greater than a threshold, greater than or equal to a threshold, less than a threshold, less than or equal to a threshold, equal to a threshold, not equal to a threshold, etc., depending on the context.

[0122] Although specific feature combinations are described in the claims and / or disclosed in the specification, these combinations are not intended to limit the disclosure of various aspects. In fact, many of these features can be combined in a manner not specifically described in the claims and / or undisclosed in the specification. Although each dependent claim listed below can be directly subordinate to only one claim, the disclosure of various aspects includes that each dependent claim is combined with each other claim in this group of claims. As used herein, the phrase quoting "at least one of" a column of items refers to any combination of these items, including single members. As an example, "at least one of a, b or c" is intended to cover: a, b, c, ab, ac, bc and abc, and any combination with multiple identical elements (for example, aa, aaa, aab, aac, abb, acc, bb, bbb, bbc, cc and ccc, or any other sorting of a, b and c).

[0123] Elements, actions or instructions used herein should not be interpreted as key or necessary unless explicitly described as such. Moreover, as used herein, the articles "one" and "a" are intended to include one or more projects, and can be used interchangeably with "one or more". In addition, as used herein, the article "the" is intended to include one or more projects quoted in conjunction with the article "the", and can be used interchangeably with "one or more". In addition, as used herein, the terms "set (set)" and "group" are intended to include one or more projects (for example, a combination of related items, non-related items, or related items and non-related items), and can be used interchangeably with "one or more". In the occasion of intending to have only one project, the phrase "only one" or similar language is used. Moreover, as used herein, the terms "having", "containing", "including" etc. are intended to be open terms. In addition, the phrase "based on" is intended to mean "based at least in part on", unless otherwise explicitly stated. Furthermore, as used herein, the term "or" when used in a sequence is intended to be inclusive and may be used interchangeably with and " / or" unless expressly stated otherwise (e.g., when used in conjunction with "either of" or "only one of").

Claims

1. A wireless communication method performed by a first user equipment (UE), comprising: Determine a side link zone in which the first UE is located and a side link zone in which the second UE is located; determining whether to transmit a sidelink timing synchronization signal to the second UE based at least in part on a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located; as well as The sidelink timing synchronization signal is selectively transmitted to the second UE based at least in part on determining whether to transmit the sidelink timing synchronization signal to the second UE.

2. The method of claim 1, further comprising: One or more parameters for the sidelink timing synchronization signal are determined based at least in part on a sidelink zone in which the first UE is located and a sidelink zone in which a second UE is located.

3. The method of claim 2, wherein the one or more parameters for the sidelink timing synchronization signal include at least one of: the bandwidth of the sidelink timing synchronization signal, the number of repetitions of the sidelink timing synchronization signal, the waveform type of the sidelink timing synchronization signal, a time domain pattern of the sidelink timing synchronization signal, a frequency domain pattern of the sidelink timing synchronization signal, the sequence length of the sidelink timing synchronization signal, the root sequence of the sidelink timing synchronization signal, or A cyclic shift of the sidelink timing synchronization signal.

4. The method of claim 2, wherein determining the one or more parameters for the sidelink timing synchronization signal comprises: Identify a combination of a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located from a plurality of configured sidelink zone combinations; as well as A particular combination of the one or more parameters is identified for the sidelink timing synchronization signal associated with the combination.

5. The method of claim 4, wherein identifying a particular combination of the one or more parameters for the sidelink timing synchronization signal associated with the combination comprises: identifying the particular combination of the one or more parameters for the sidelink timing synchronization signal based at least in part on at least one of: surface, standard, Specification, or A configuration stored by the first UE.

6. The method of claim 1 , wherein determining whether to transmit the sidelink timing synchronization signal to the second UE comprises: Identify a combination of a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located from a plurality of configured sidelink zone combinations; as well as A determination is made whether to transmit the sidelink timing synchronization signal to the second UE based at least in part on whether transmission of the sidelink timing synchronization signal is configured for the combination.

7. The method of claim 6, further comprising: determining whether transmission of the sidelink timing synchronization signal is configured for the combination based at least in part on at least one of: surface, standard, Specification, or A configuration stored by the first UE.

8. The method of claim 1 , wherein determining whether to transmit the sidelink timing synchronization signal to the second UE comprises: Determining to transmit the sidelink timing synchronization signal to the second UE; and Wherein selectively transmitting the sidelink timing synchronization signal to the second UE comprises: The sidelink timing synchronization signal is transmitted to the second UE based at least in part on determining that the sidelink timing synchronization signal is to be transmitted to the second UE.

9. The method of claim 1 , wherein determining whether to transmit the sidelink timing synchronization signal to the second UE comprises: Determining to suppress transmitting the sidelink timing synchronization signal to the second UE; and Wherein selectively transmitting the sidelink timing synchronization signal to the second UE comprises: Transmitting the sidelink timing synchronization signal to the second UE is refrained from based at least in part on a determination to refrain from transmitting the sidelink timing synchronization signal to the second UE.

10. A wireless communication method performed by a first user equipment (UE), comprising: Determine a side link zone in which the first UE is located and a side link zone in which the second UE is located; determining whether the second UE is to transmit a sidelink timing synchronization signal to the first UE based at least in part on a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located; as well as The sidelink timing synchronization signal is selectively received from the second UE based at least in part on determining whether the second UE is to transmit the sidelink timing synchronization signal to the first UE.

11. The method of claim 10, further comprising: One or more parameters for the sidelink timing synchronization signal are determined based at least in part on a sidelink zone in which the first UE is located and a sidelink zone in which a second UE is located.

12. The method of claim 11, wherein the one or more parameters for the sidelink timing synchronization signal include at least one of: the bandwidth of the sidelink timing synchronization signal, the number of repetitions of the sidelink timing synchronization signal, the waveform type of the sidelink timing synchronization signal, a time domain pattern of the sidelink timing synchronization signal, a frequency domain pattern of the sidelink timing synchronization signal, the sequence length of the sidelink timing synchronization signal, the root sequence of the sidelink timing synchronization signal, or A cyclic shift of the sidelink timing synchronization signal.

13. The method of claim 11 , wherein determining the one or more parameters for the sidelink timing synchronization signal comprises: Identify a combination of a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located from a plurality of configured sidelink zone combinations; as well as A particular combination of the one or more parameters is identified for the sidelink timing synchronization signal associated with the combination.

14. The method of claim 13, wherein identifying a particular combination of the one or more parameters for the sidelink timing synchronization signal associated with the combination comprises: identifying the particular combination of the one or more parameters for the sidelink timing synchronization signal based at least in part on at least one of: surface, standard, Specification, or A configuration stored by the first UE.

15. The method of claim 10, wherein determining whether the second UE is to transmit the sidelink timing synchronization signal to the first UE comprises: Identify a combination of a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located from a plurality of configured sidelink zone combinations; as well as A determination is made whether the second UE is to transmit the sidelink timing synchronization signal to the first UE based at least in part on whether transmission of the sidelink timing synchronization signal is configured for the combination.

16. The method of claim 15, further comprising: determining whether transmission of the sidelink timing synchronization signal is configured for the combination based at least in part on at least one of: surface, standard, Specification, or A configuration stored by the first UE.

17. The method of claim 10, wherein determining whether the second UE is to transmit the sidelink timing synchronization signal to the first UE comprises: determining that the second UE is to transmit the sidelink timing synchronization signal to the first UE; and Wherein selectively receiving the sidelink timing synchronization signal from the second UE includes: The sidelink timing synchronization signal is received from the second UE based at least in part on determining that the second UE is to transmit the sidelink timing synchronization signal to the first UE.

18. The method of claim 10, wherein determining whether the second UE is to transmit the sidelink timing synchronization signal to the first UE comprises: determining that the second UE is to refrain from transmitting the sidelink timing synchronization signal to the first UE; and Wherein selectively receiving the sidelink timing synchronization signal from the second UE includes: The method further comprises refraining from receiving the sidelink timing synchronization signal from the second UE based at least in part on determining that the second UE is to refrain from transmitting the sidelink timing synchronization signal to the first UE.

19. A first user equipment (UE) for wireless communication, comprising: Memory; as well as one or more processors coupled to the memory, the one or more processors configured to: Determine a side link zone in which the first UE is located and a side link zone in which the second UE is located; determining whether to transmit a sidelink timing synchronization signal to the second UE based at least in part on a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located; as well as The sidelink timing synchronization signal is selectively transmitted to the second UE based at least in part on determining whether to transmit the sidelink timing synchronization signal to the second UE.

20. The first UE of claim 19, wherein the one or more processors are further configured to: One or more parameters for the sidelink timing synchronization signal are determined based at least in part on a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located.

21. The first UE of claim 20, wherein to determine the one or more parameters for the sidelink timing synchronization signal, the one or more processors are configured to: identifying a combination of a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located from a plurality of configured sidelink zone combinations; and A particular combination of the one or more parameters is identified for the sidelink timing synchronization signal associated with the combination.

22. The first UE of claim 19, wherein to determine whether to transmit the sidelink timing synchronization signal to the second UE, the one or more processors are configured to: identifying a combination of a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located from a plurality of configured sidelink zone combinations; and Whether to transmit the sidelink timing synchronization signal to the second UE is determined based at least in part on whether transmission of the sidelink timing synchronization signal is configured for the combination.

23. The first UE of claim 19, wherein to determine whether to transmit the sidelink timing synchronization signal to the second UE, the one or more processors are configured to: determining to transmit the sidelink timing synchronization signal to the second UE; and Wherein, in order to selectively transmit the sidelink timing synchronization signal to the second UE, the one or more processors are configured to: The sidelink timing synchronization signal is transmitted to the second UE based at least in part on determining that the sidelink timing synchronization signal is to be transmitted to the second UE.

24. The first UE of claim 19, wherein to determine whether to transmit the sidelink timing synchronization signal to the second UE, the one or more processors are configured to: determining to suppress transmission of the sidelink timing synchronization signal to the second UE; and Wherein, in order to selectively transmit the sidelink timing synchronization signal to the second UE, the one or more processors are configured to: Transmitting the sidelink timing synchronization signal to the second UE is refrained from based at least in part on a determination to refrain from transmitting the sidelink timing synchronization signal to the second UE.

25. A first user equipment (UE) for wireless communication, comprising: Memory; as well as one or more processors coupled to the memory, the one or more processors configured to: Determine a side link zone in which the first UE is located and a side link zone in which the second UE is located; determining whether the second UE is to transmit a sidelink timing synchronization signal to the first UE based at least in part on a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located; as well as The sidelink timing synchronization signal is selectively received from the second UE based at least in part on determining whether the second UE is to transmit the sidelink timing synchronization signal to the first UE.

26. The first UE of claim 25, wherein the one or more processors are further configured to: One or more parameters for the sidelink timing synchronization signal are determined based at least in part on a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located.

27. The first UE of claim 26, wherein the one or more parameters for the sidelink timing synchronization signal include at least one of: the bandwidth of the sidelink timing synchronization signal, the number of repetitions of the sidelink timing synchronization signal, the waveform type of the sidelink timing synchronization signal, a time domain pattern of the sidelink timing synchronization signal, a frequency domain pattern of the sidelink timing synchronization signal, the sequence length of the sidelink timing synchronization signal, the root sequence of the sidelink timing synchronization signal, or A cyclic shift of the sidelink timing synchronization signal.

28. The first UE of claim 26, wherein to determine the one or more parameters for the sidelink timing synchronization signal, the one or more processors are configured to: identifying a combination of a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located from a plurality of configured sidelink zone combinations; and A particular combination of the one or more parameters is identified for the sidelink timing synchronization signal associated with the combination.

29. The first UE of claim 28, wherein to identify a specific combination of the one or more parameters for the sidelink timing synchronization signal associated with the combination, the one or more processors are configured to: identifying the particular combination of the one or more parameters for the sidelink timing synchronization signal based at least in part on at least one of: surface, standard, Specification, or A configuration stored by the first UE.

30. The first UE of claim 25, wherein to determine whether the second UE is to transmit the sidelink timing synchronization signal to the first UE, the one or more processors are configured to: identifying a combination of a sidelink zone in which the first UE is located and a sidelink zone in which the second UE is located from a plurality of configured sidelink zone combinations; and A determination is made whether the second UE is to transmit the sidelink timing synchronization signal to the first UE based at least in part on whether transmission of the sidelink timing synchronization signal is configured for the combination.

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