Terminal, system and method for selecting channel resources in sidelink transmission

Abstract

A terminal may include a receiver configured to receive configuration parameters for a sidelink (SL) transmission, the sidelink (SL) transmission including a resource selected from a portion of an unlicensed spectrum. The configuration parameter may indicate a definition of a sidelink synchronization signal block ("S-SSB") transmission timing or an S-SSB frequency structure for the SL transmission. The terminal may include a processor configured to perform a resource selection procedure including transmitting a selected resource for the SL according to the S-SSB transmission timing or the S-SSB frequency structure. The terminal may include a transmitter configured to transmit the SL transmission to another terminal.

Description

Technical Field

[0001] The present application relates to wireless devices and wireless networks, including devices, circuits and methods for performing sidelink communication procedures. Background Art

[0002] The use of wireless communication systems is growing rapidly. In recent years, wireless devices (such as smart phones and tablet computers) have become increasingly sophisticated. In addition to supporting phone calls, many mobile devices now also provide access to the Internet, email, text messaging, and navigation using the Global Positioning System (GPS), and are capable of operating complex applications that utilize these functionalities. Additionally, there are many different wireless communication technologies and wireless communication standards. Some examples of wireless communication standards include GSM, UMTS (e.g., associated with WCDMA or TD-SCDMA air interfaces), LTE, Advanced LTE (LTE-A), HSPA, 3GPP2 CDMA2000 (e.g., 1xRTT, 1xEV-DO, HRPD, eHRPD), IEEE 802.11 (WLAN or Wi-Fi), and Bluetooth. TM etc.

[0003] The introduction of an ever-increasing number of features and functionalities in wireless communication devices has also created a continuing need for improved wireless communications and improved wireless communication devices. In order to increase coverage and better serve the increased demand and scope of intended uses of wireless communications, in addition to the above-mentioned communication standards, there are also wireless communication technologies under development, including the fifth generation (5G) standard and the new radio (NR) communication technology. Therefore, there is a need to improve the field of supporting such development and design. Summary of the invention

[0004] In one or more embodiments, a terminal includes a receiver configured to receive configuration parameters for a sidelink (SL) transmission, the sidelink (SL) transmission including resources selected from a portion of an unlicensed spectrum. The configuration parameters indicate a definition of a sidelink synchronization signal block ("S-SSB") transmission timing or an S-SSB frequency structure for the SL transmission. The terminal includes a processor configured to perform a resource selection process including selecting resources for the SL transmission based on the S-SSB transmission timing or the S-SSB frequency structure. The terminal includes a transmitter configured to send the SL transmission to another terminal.

[0005] The techniques described herein may be implemented in and / or used with a plurality of different types of devices, including, but not limited to, any of cellular telephones, wireless devices, tablet computers, wearable computing devices, portable media players, and a variety of other computing devices.

[0006] This summary is intended to provide a brief overview of some of the topics described in this document. Therefore, it should be understood that the above features are only examples and should not be construed as narrowing the scope or essence of the topics described herein in any way. Other features, aspects, and advantages of the topics described herein will become apparent through the following detailed description, drawings, and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] A better understanding of the present subject matter may be gained when the following detailed description of the various aspects is considered in conjunction with the following drawings:

[0008] Figure 1

[0013] An example wireless communication system according to some aspects is illustrated.

[0009] Figure 2 An example block diagram of a UE according to some aspects is illustrated.

[0010] Figure 3 An example block diagram of a BS in accordance with some aspects is illustrated.

[0011] Figure 4 An example block diagram of wireless communication circuitry in accordance with some aspects is illustrated.

[0012] FIG. 5A to FIG. 5C is a diagram illustrating an example of a sidelink synchronization signal block ("S-SSB") configuration structure in accordance with some aspects.

[0013] FIG. 6A to FIG. 6C is a diagram illustrating an example of an S-SSB configuration structure according to some aspects.

[0014] Figure 7 is a flow chart detailing a method for selecting resources in an S-SSB structure according to some aspects.

[0015] Figure 8 is a diagram illustrating an example of a SL transmission configuration according to some aspects.

[0016] Fig. 9 is a diagram illustrating an example of a SL transmission configuration according to some aspects.

[0017] Fig.10 is a diagram illustrating an example of a SL transmission configuration according to some aspects.

[0018] Fig.11A and Fig. 11B is a diagram illustrating an example of a cyclic shift pair configuration in accordance with some aspects.

[0019] Fig.12 is a flow chart detailing a method of selecting resources in a SL transmission according to some aspects.

[0020] Although the features described herein are susceptible to various modifications and alternative forms, specific aspects thereof are shown by way of example in the drawings and described in detail herein. However, it should be understood that the drawings and detailed description thereof are not intended to be limited to the specific forms disclosed, but on the contrary, are intended to cover all modifications, equivalents and alternatives falling within the spirit and scope of the subject matter as defined by the appended claims. DETAILED DESCRIPTION

[0021] There is a need to study and evaluate the sidelink (SL) communication process, signaling and resource selection for enabling the unlicensed spectrum in the 5G / New Radio (NR) environment. Therefore, various solutions for performing and improving SL transmission on the unlicensed spectrum are disclosed herein, including: 1) resource selection in the S-SSB structure; 2) resource selection for configuring S-SSB timing; and 3) resource selection for PSFCH retransmission.

[0022] According to one or more embodiments, a user equipment (UE) device or terminal communicating with other terminals (other wireless communication devices, network devices, UE devices and / or base station (BS) devices) may perform radio transmissions including SL communication processes on portions of unlicensed spectrum. The SL communication process may be configured to include one or more resource allocation processes supported by the radio interface operation between the UE and the BS (Uu). The Uu interface or link refers to the air interface between the UE and the radio access network (RAN), while the sidelink interface refers to the interface between the UEs. SL communication may include unicast communication from the UE device to the BS device or another UE device, and unicast or multicast communication from the BS device or the other UE device to the UE device. The first communication mode may include receiving a resource allocation configuration indicating a resource allocation mode from the core network via the Uu link. The second communication mode may include receiving a resource allocation configuration from another UE device in one or more resource pools. The first communication mode and the second communication mode may be further defined in the same manner as resource allocation mode 1 and resource allocation mode 2 described in TS 38.300 of the 3GPP standard, respectively.

[0023] In some embodiments, the unlicensed spectrum is a separate unlicensed band in a bandwidth ranging between 4.1 gigahertz (GHz) and 7.125 GHz. For example, the unlicensed band may be in the range between 5.150 GHz and 5.925 GHz and between 5.925 GHz and 7.125 GHz, which correspond to NR bands n46 and n96 / n102 of the frequency range (FR1) defined in TS 38.101 of the 3GPP standard, respectively.

[0024] In one or more embodiments, a separate bandwidth part (BWP) may be configured to perform SL transmission. In some embodiments, a SL BWP is a set of contiguous physical resource blocks (PRBs) in a SL transmission, selected from a contiguous subset of common resource blocks (RBs) of a given parameter set (μ) on a given carrier configured for a SL communication process. Each SL BWP may be defined for a given parameter set (μ) with respect to subcarrier spacing, symbol duration, and / or cyclic prefix (CP) length. A UE device may be configured with four SL BWPs for downlink and uplink. At any point in time, one of the SL BWPs may be effectively used for downlink or uplink. The SL BWP may be pre-configured (e.g., configured from factory settings) or dynamically configured (e.g., configured from a core network via a BS device or a UE device) to include multiple SL resource pools. At least one SL resource pool may be (pre) configured according to an integer number of RB sets. The SL resource pool may be a predefined resource pool configured to include a subset of PRBs of an RB set. Furthermore, if the SL resource pool includes at least two adjacent RB sets, the SL resource pool may be configured with respect to a subchannel size and the number of subchannels in the SL resource pool.

[0025] In one or more embodiments, the SL communication process includes: selecting resources for SL transmission in the SL physical channel. Some SL physical channels include a physical sidelink broadcast channel ("PSBCH"), a physical sidelink control channel ("PSCCH"), a physical sidelink shared channel ("PSSCH"), and a physical sidelink feedback channel ("PSFCH"). PSCCH and PSFCH are independent channels. PSCCH includes a portion of the sidelink channel information ("SCI"), and PSSCH may include the rest. PSFCH may include sidelink feedback control information ("SFCI") and HARQ feedback received for PSSCH. These physical channels may include SL-specific physical signals, such as DM-RS, CSI-RS, PT-RS, sidelink primary synchronization signal ("S-PSS"), and sidelink secondary synchronization signal ("S-SSS"). PSCCH may be associated with DM-RS. In addition, PSSCH may be associated with DM-RS and PT-RS. The SL communication process may include: selecting SL physical channel resources based on one or more sidelink synchronization signal block ("S-SSB") structures.

[0026] In one or more embodiments, the terminal is configured to receive configuration parameters for a SL transmission, the SL transmission including resources selected from a portion of an unlicensed spectrum. The configuration parameters may indicate a definition of an S-SSB transmission timing or an S-SSB frequency structure for the SL transmission. The terminal may perform a resource selection process including selecting resources for the SL transmission based on the S-SSB transmission timing or the S-SSB frequency structure.

[0027] In some embodiments, the S-SSB frequency structure may include a parameter set and resource selection information. The parameter set may indicate that the subcarrier spacing is equal to a first value or a second value. The first value may be greater than the second value. The resource selection information may indicate that a first number of resources are selected for a first portion of a physical sidelink broadcast channel ("PSBCH") and a second number of resources are selected for a second portion of the PBSCH. In some embodiments, when the subcarrier spacing is equal to the first value, the resource selection information selects a first set of resources for the first portion of the PSBCH. In other embodiments, when the subcarrier spacing is equal to the second value, the resource selection information selects a second set of resources for the first portion of the PSBCH. The second set of resources may be equal to or greater than the first set of resources. In some embodiments, the resources selected for different portions of the PSBCH may be the same or different between one portion and another portion.

[0028] In addition, the resource selection information selects resources for automatic gain control ("AGC") symbols. The AGC symbol can be a copy of the first SL primary synchronization signal ("S-PSS") symbol or the last SL secondary synchronization signal ("S-SSS") symbol in the S-SSB frequency structure. The resource selection may indicate an interleaving structure of the second set of resources. The interleaving structure may indicate whether the second set of resources is equal to or greater than the first set of resources. The resource selection may indicate an interleaving structure of the second set of resources. The interleaving structure may indicate whether the second set of resources is equal to or greater than the first set of resources.

[0029] In one or more embodiments, the S-SSB transmission timing indicates an S-SSB timing structure for SL transmission. The S-SSB timing structure may include resource selection information that defines at least one S-SSB opportunity in a time slot. The number of S-SSB opportunities in a time slot may be configured, preconfigured, or predefined. The resource selection information may indicate the position in the time slot for a symbol offset, a first S-SSB opportunity, a symbol gap, and a second S-SSB opportunity. The symbol offset may be at the beginning of the time slot and before the first S-SSB opportunity. The symbol gap may be between the first S-SSB opportunity and the second S-SSB opportunity. The S-SSB opportunity may include a duration of four symbols and one automatic gain control ("AGC") symbol in the time slot. The resource selection information may indicate the position of a first AGC symbol, a second AGC symbol, a third AGC symbol, a first S-SSB opportunity, a second S-SSB opportunity, a third S-SSB opportunity, and a symbol gap in the time slot.

[0030] In some embodiments, the S-SSB timing structure includes resource selection information that defines a plurality of S-SSB time slot opportunities in a plurality of S-SSB bundles, a number of S-SSB time slot opportunities in an S-SSB bundle, and a number of S-SSB bundles. The plurality of numbers may be configured, (pre)configured, or predefined via dynamic configuration. In other embodiments, the resource selection information indicates a location in an S-SSB bundle for a plurality of S-SSB time slot opportunities, a plurality of intra-bundle gaps, and at least one inter-bundle gap.

[0031] In some embodiments, a terminal may receive configuration parameters for a SL transmission, the SL transmission comprising resources selected from a portion of an unlicensed spectrum. The configuration parameters may indicate a resource selection mode for a SL subchannel in the SL transmission. The terminal may perform a resource selection process, the resource selection process comprising selecting resources for the SL transmission according to the resource selection mode; and a transmitter configured to send the SL transmission.

[0032] In one or more embodiments, SL transmissions include physical sidelink feedback channel ("PSFCH") transmissions that meet occupied channel bandwidth ("OCB") / power spectral density ("PSD") requirements. PSFCH transmissions may use the same interleaving as corresponding physical sidelink control channel ("PSCCH") / physical sidelink shared channel ("PSSCH") transmissions.

[0033] The UE device may be configured to perform one or more SL transmissions as part of a SL communication process. The one or more SL transmissions may be transmissions (or receptions of transmissions) that follow a protocol in which the UE device selects resources based on indexed frequency resources.

[0034] The UE device may implement the SL communication process when receiving an instruction from one of its neighboring terminals, or when receiving approval from one of its neighboring terminals after requesting initialization of the SL communication process. The UE device may coordinate SL transmission with terminals connected via multiple radio access technologies (RATs) (i.e., LTE-A, 5G NR, and upcoming 6G).

[0035] In some embodiments, the UE device is configured to perform SL transmission without negatively impacting the user's experience. To achieve this, the UE device selects resources in the unlicensed spectrum without compromising data integrity from communication resources selected in the unlicensed spectrum for the same SL transmission. Successful selection of frequency resources in the unlicensed spectrum and the licensed spectrum in the same SL transmission can prevent data rate reduction, increased latency, or jitter. In this regard, the UE device obtains communication parameters that define reference information indicating resource selection for the SL communication process. The UE device may use the communication parameters to determine a resource selection mode to be used in the SL transmission process.

[0036] The resource selection mode may be determined based on parameters obtained for the SL sending process. In one or more embodiments, the UE device identifies an SL resource pool including a set of SL resources for directly communicating with one or more additional terminals during the SL sending process. The resource selection mode may be determined based on the identified SL resource pool and / or may include resources selected from at least a portion of the set of SL resources in the SL resource pool. The SL resource pool may be an existing SL resource pool previously configured for the SL communication process and / or may be an independent SL resource pool selected specifically for the SL communication process.

[0037] The UE device may initiate the SL communication process by sending a broadcast signal to the neighboring terminals, and the broadcast signal may include terminal capabilities and at least one communication request. The terminal capabilities may be communication information about one or more transmission and reception capabilities of the UE device, and the communication request may include a request to the neighboring terminal to start the communication process.

[0038] As described above, the parameters may be received by the UE device from the neighboring terminal via the SL communication link. If the neighboring terminal is another UE device, the parameters may be obtained from the other UE device via an additional communication link established with the core network. If the neighboring terminal is a base station, the parameters may be obtained from the base station via higher layer signaling (e.g., signaling received from an upper layer using radio resource control (RRC) messaging or medium access control (MAC) messaging in a device connected to the core network).

[0039] The following is a glossary of terms that may be used in this disclosure:

[0040] Memory medium – Any of various types of non-transitory memory devices or storage devices. The term “memory medium” is intended to include installation media (e.g., CD-ROM, floppy disk, or tape device; computer system memory or random access memory, such as DRAM, DDR RAM, SRAM, EDO RAM, Rambus RAM), non-volatile memory such as Flash, magnetic media (e.g., hard drive or optical storage device; registers or other similar types of memory elements). Memory media may also include other types of non-transitory memory or a combination thereof. In addition, the memory medium may be located in a first computer system executing a program, or may be located in a different second computer system connected to the first computer system via a network (such as the Internet). In the latter example, the second computer system may provide program instructions to the first computer for execution. The term “memory medium” may include two or more memory media that may reside in different locations (e.g., in different computer systems connected via a network). The memory medium may store program instructions (e.g., expressed as a computer program) that may be executed by one or more processors.

[0041] Carrier Medium—storage media as described above, and physical transmission media such as a bus, network, and / or other physical transmission media that convey signals such as electrical, electromagnetic, or digital signals.

[0042] Programmable hardware element - includes various hardware devices that include multiple programmable function blocks connected via programmable interconnects. Examples include FPGA (field programmable gate array), PLD (programmable logic device), FPOA (field programmable object array), and CPLD (complex PLD). Programmable function blocks can range from fine-grained (combinatorial logic or lookup table) to coarse-grained (arithmetic logic unit or processor core). Programmable hardware elements may also be referred to as "configurable logic units".

[0043] User Equipment (UE) (also referred to as "user device", "UE device" or "terminal") - any of various types of computer systems or devices that are mobile or portable and that perform wireless communications. Examples of UE devices include mobile phones or smart phones (e.g., iPhone TM , based on Android TM phones), portable gaming devices (e.g., Nintendo Switch TM 、Nintendo DS TM , PlayStation Vita TM , PlayStation Portable TM 、Gameboy Advance TM , iPhone TM ), laptops, wearable devices (e.g., smart watches, smart glasses), PDAs, portable internet devices, music players, data storage devices, other handheld devices, in-vehicle infotainment (IVI), in-car entertainment (ICE) devices, instrument clusters, head-up display (HUD) devices, on-board diagnostic (OBD) devices, dashboard mobile equipment (DME), mobile data terminals (MDT), electronic engine management systems (EEMS), electronic / engine control units (ECU), electronic / engine control modules (ECM), embedded systems, microcontrollers, control modules, engine management systems (EMS), networked or "smart" appliances, machine type communication (MTC) devices, machine interaction (M2M) and Internet of Things (IoT) devices, etc. In general, the term "UE" or "UE device" or "terminal" or "user equipment" can be broadly defined to cover any electronic, computing and / or telecommunication device (or combination of devices) that is easily transportable by a user (or vehicle) and capable of wireless communication.

[0044] Wireless Device—Any of various types of computer systems or devices that perform wireless communications. A wireless device may be portable (or mobile), or may be stationary or fixed at a certain location. A UE is an example of a wireless device.

[0045] Communication device – Any of various types of computer systems or devices that perform communication, where the communication may be wired or wireless. A communication device may be portable (or mobile), or may be stationary or fixed at a location. A wireless device is an example of a communication device. A UE is another example of a communication device.

[0046] Base Station – The term “base station”, “wireless base station” or “wireless station” has the full scope of its ordinary meaning and includes at least a wireless communication station that is installed at a fixed location and used to communicate as part of a wireless telephone system or radio system. For example, if a base station is implemented in the context of LTE, it may alternatively be referred to as an “eNodeB” or “eNB”. If a base station is implemented in the context of 5G NR, it may alternatively be referred to as a “gNodeB” or “gNB”. Although certain aspects are described in the context of LTE or 5G NR, references to “eNB”, “gNB”, “nodeB”, “base station”, “NB”, etc. may also refer to one or more wireless nodes that serve a cell to provide wireless connectivity between a user device and a generally wider network, and the concepts discussed are not limited to any particular wireless technology. Although certain aspects are described in the context of LTE or 5G NR, references to “eNB”, “gNB”, “nodeB”, “base station”, “NB”, etc. are not intended to limit the concepts discussed herein to any particular wireless technology, and the concepts discussed may be applied to any wireless system.

[0047] Node - The term "node" or "wireless node" as used herein may refer to one or more devices associated with a cell that provides wireless connectivity between user equipment and a typically wired network.

[0048] Processing element (or processor) – refers to various elements or combinations of elements that are capable of performing functions in a device, such as user equipment or a cellular network device. A processing element may include, for example, any of a processor and associated memory, portions or circuits of individual processor cores, entire processor cores, separate processors, processor arrays, circuits such as application specific integrated circuits (ASICs), programmable hardware elements such as field programmable gate arrays (FPGAs), and various combinations of the above.

[0049] Channel - a medium used to convey information from a transmitter (sender) to a receiver. It should be noted that, since the characteristics of the term "channel" may vary according to different wireless protocols, the term "channel" as used herein may be considered to be used in a manner that conforms to the standards of the type of device to which the term is used. In some standards, the channel width may be variable (e.g., depending on device capabilities and frequency band conditions, etc.). For example, LTE may support scalable channel bandwidths of 1.4MHz to 20MHz. A WLAN channel may be 22MHz wide, while a Bluetooth channel may be 1Mhz wide. Other protocols and standards may include different definitions of channels. In addition, some standards may define and use multiple types of channels (e.g., different channels for uplink or downlink and / or different channels for different purposes (such as data and control information, etc.)).

[0050] Frequency band - The term "frequency band" has the full breadth of its ordinary meaning and includes at least a segment of the spectrum (eg, radio frequency spectrum) in which channels are used or set aside for the same purpose.

[0051] Configured to - Various components may be described as being "configured to" perform one or more tasks. In such contexts, "configured to" is a broad statement that generally means "having a structure" that performs one or more tasks during operation. Thus, a component can be configured to perform a task even when the component is not currently performing the task (e.g., a set of electrical conductors can be configured to electrically connect a module to another module even when the two modules are not connected). In some contexts, "configured to" can be a broad statement that generally means "having a circuit" that performs one or more tasks during operation. Thus, the component can be configured to perform a task even when the component is not currently turned on. Generally speaking, the circuitry that forms the structure corresponding to "configured to" may include hardware circuits.

[0052] For ease of description, various components may be described as performing one or more tasks. Such descriptions should be interpreted as including the phrase "configured to". Representing a component configured to perform one or more tasks expressly intends that the component does not invoke the interpretation of 35 U.S.C. §112(f).

[0053] Example Wireless Communication System

[0054] Now go to Figure 1 , illustrates a simplified example of a wireless communication system according to some aspects. Note that Figure 1 The systems are merely non-limiting examples of possible systems, and features of the present disclosure may be implemented in any of a variety of systems as desired.

[0055] As shown, the example wireless communication system includes a base station 102A that communicates with one or more user devices 106A, 106B to 106Z via a transmission medium. Each of the user devices may be referred to herein as a "user equipment" (UE). Therefore, the user device 106 is referred to as a UE or UE device.

[0056] The base station (BS) 102A may be a base transceiver station (BTS) or a cell site (eg, a "cellular base station"), and may include hardware that enables wireless communications with the UEs 106A-106Z.

[0057] The communication area (or coverage area) of a base station may be referred to as a "cell". The base station 102A and the UE 106 may be configured to communicate over a transmission medium using any of a variety of radio access technologies (RATs), which are also referred to as wireless communication technologies or telecommunication standards, such as GSM, UMTS (associated with, for example, WCDMA or TD-SCDMA air interfaces), LTE, LTE-A, 5G NR, HSPA, 3GPP2 CDMA2000. Note that if the base station 102A is implemented in the context of LTE, the base station may alternatively be referred to as 'eNodeB' or 'eNB'. Note that if the base station 102A is implemented in the context of 5G NR, the base station may alternatively be referred to as "gNodeB" or "gNB".

[0058] In some aspects, UE 106 may be an IoT UE that may include a network access layer designed for low-power IoT applications that utilize short-term UE connections. The IoT UE may utilize technologies such as M2M or MTC to exchange data with an MTC server or device via a public land mobile network (PLMN), a short-range service (ProSe), or a device-to-device (D2D) communication, a sensor network, or an IoT network. The M2M or MTC data exchange may be a machine-initiated data exchange. The IoT network describes interconnected IoT UEs that may include uniquely identifiable embedded computing devices (within the Internet infrastructure) with short-lived connections. As an example, a vehicle-to-everything (V2X) network may utilize ProSe features using an SL interface to communicate directly between devices. The IoT UE may also execute background applications (e.g., keep-alive messages, status updates, etc.) to facilitate connectivity to the IoT network.

[0059] As shown, UE 106 (such as UE 106A and UE 106B) can directly exchange communication data via SL interface 108. SL interface 108 can be a PC5 interface, which includes one or more physical channels, including but not limited to a physical sidelink shared channel (PSSCH), a physical sidelink control channel (PSCCH), a physical sidelink broadcast channel (PSBCH), and a physical sidelink feedback channel (PSFCH).

[0060] In a V2X scenario, one or more of the base stations 102 may be a roadside unit (RSU) or act as an RSU. The term RSU may refer to any transportation infrastructure entity used for V2X communication. The RSU may be implemented in or by a suitable wireless node or a stationary (or relatively stationary) UE, wherein an RSU implemented in or by a UE may be referred to as a "UE-type RSU", an RSU implemented in or by an eNB may be referred to as an "eNB-type RSU", an RSU implemented in or by a gNB may be referred to as a "gNB-type RSU", and so on. In one example, the RSU is a computing device coupled to a radio frequency circuit located on the roadside that provides connectivity support to a passing vehicle UE (vUE). The RSU may also include internal data storage circuitry for storing intersection map geometry, traffic statistics, media, and applications / software for sensing and controlling ongoing vehicle and pedestrian traffic. The RSU may operate on the 5.9 GHz Intelligent Transportation System (ITS) band to provide extremely low latency communications required for high-speed events, such as collision avoidance and traffic warnings. Additionally or alternatively, the RSU may operate on the cellular V2X band to provide the aforementioned low latency communications as well as other cellular communication services. Additionally or alternatively, the RSU may operate as a Wi-Fi hotspot (2.4 GHz band) and / or provide connectivity to one or more cellular networks to provide uplink and downlink communications. Some or all of the RF circuits of the computing device and the RSU may be packaged in a weatherpr23 package suitable for outdoor installation, and may include a network interface controller to provide a wired connection (e.g., Ethernet) to a traffic signal controller and / or a backhaul network.

[0061] As shown, the base station 102A may also be configured to communicate with the network 100 (e.g., a core network of a cellular service provider, a telecommunication network such as a public switched telephone network (PSTN) and / or the Internet, among other possibilities). Thus, the base station 102A may facilitate communications between user devices and / or between user devices and the network 100. Specifically, the cellular base station 102A may provide the UE 106 with various telecommunication capabilities such as voice, SMS, and / or data services.

[0062] Base station 102A and other similar base stations (such as base stations 102B to 102N) operating according to the same or different cellular communication standards can therefore be provided as a network of cells that can provide continuous or nearly continuous overlapping service to UEs 106A to 106Z and similar devices over a geographic area via one or more cellular communication standards.

[0063] Thus, although base station 102A may function as Figure 1 The illustrated "serving cell" of UEs 106A to 106Z, but each UE 106 may also be able to receive signals from (and possibly be within communication range of) one or more other cells (which may be provided by base stations 102B to 102Z and / or any other base stations), which may be referred to as "neighboring cells." Such cells may also be able to facilitate communications between user devices and / or between user devices and network 100. Such cells may include "macro" cells, "micro" cells, "pico" cells, and / or any other variety of other granularity of cells providing service area size. For example, in Figure 1 The base stations 102A and 102B illustrated in FIG. 1 may be macro cells, while the base station 102Z may be a micro cell. Other configurations are also possible.

[0064] In some aspects, base station 102A may be a next generation base station (e.g., a 5G New Radio (5G NR) base station or "gNB"). In some aspects, the gNB may be connected to a legacy evolved packet core (EPC) network and / or to an NR core (NRC) / 5G core (5GC) network. In addition, a gNB cell may include one or more transition and reception points (TRPs). In addition, a UE capable of operating in accordance with 5GNR may be connected to one or more TRPs within one or more gNBs. For example, base station 102A and one or more other base stations 102 may support joint transmissions such that UE 106 may be able to receive transmissions from multiple base stations (and / or multiple TRPs provided by the same base station). For example, as Figure 1 As illustrated, base station 102A and base station 102C are both shown serving UE 106A.

[0065] It should be noted that the UE 106 may be capable of communicating using multiple wireless communication standards. For example, in addition to at least one of the cellular communication protocols discussed in the above definition, the UE 106 may also be configured to communicate using wireless networking (e.g., Wi-Fi) and / or peer-to-peer wireless communication protocols (e.g., Bluetooth and Wi-Fi peer-to-peer, etc.). If desired, the UE 106 may additionally or alternatively be configured to communicate using one or more global navigation satellite systems (GNSS) (e.g., GPS or GLONASS), one or more mobile television broadcast standards (e.g., ATSC-M / H), and / or any other wireless communication protocol. Other combinations of wireless communication standards (including more than two wireless communication standards) are also possible.

[0066] In one or more embodiments, UE 106 may be a device with cellular communication capabilities, such as a mobile phone, handheld device, computer, laptop, tablet, smart watch or other wearable device, or virtually any type of wireless device.

[0067] UE 106 may include a processor (processing element) configured to execute program instructions stored in a memory. UE 106 may perform any of the method aspects described herein by executing such stored instructions. Alternatively or in addition, UE 106 may include a programmable hardware element, such as an FPGA (field programmable gate array), an integrated circuit, and / or any of a variety of other possible hardware components configured to perform (e.g., individually or in combination) any of the method aspects described herein or any part of any of the method aspects described herein.

[0068] UE 106 may include one or more antennas for communicating using one or more wireless communication protocols or technologies. In some aspects, UE 106 may be configured to communicate using, for example, NR or LTE using at least some shared radio components. As an additional possibility, UE 106 may be configured to communicate using CDMA2000 (1xRTT / 1xEV-DO / HRPD / eHRPD) or LTE using a single shared radio component and / or GSM or LTE using a single shared radio component. The shared radio component may be coupled to a single antenna, or may be coupled to multiple antennas (e.g., for a multiple input multiple output (MIMO) configuration) for performing wireless communications. In general, the radio component may include any combination of a baseband processor, an analog RF signal processing circuit (e.g., including filters, mixers, oscillators, and amplifiers, etc.), or a digital processing circuit (e.g., for digital modulation and other digital processing). Similarly, the radio component may use the aforementioned hardware to implement one or more receive chains and transmit chains. For example, the UE 106 may share one or more portions of the receive chain and / or the transmit chain between multiple wireless communication technologies, such as those discussed above.

[0069] In some aspects, the UE 106 may include a separate transmit chain and / or receive chain (e.g., including separate antennas and other radio components) for each wireless communication protocol with which it is configured to communicate. As another possibility, the UE 106 may include one or more radio components shared between multiple wireless communication protocols, and one or more radio components used uniquely by a single wireless communication protocol. For example, the UE 106 may include a shared radio component for communicating using either LTE or 5G NR (or either LTE or 1xRTT, or either LTE or GSM, and various possibilities), and a separate radio component for communicating using each of Wi-Fi and Bluetooth. Other configurations are also possible.

[0070] In some aspects, the downlink resource grid can be used for downlink transmission from any base station in the base station 102 to the UE 106, while the uplink transmission can utilize similar techniques. The grid can be a time-frequency grid, referred to as a resource grid or a time-frequency resource grid, which is the physical resource in the downlink in each time slot. For orthogonal frequency division multiplexing (OFDM) systems, such time-frequency plane representation is a conventional practice, which makes radio resource selection intuitive. Each column and each row of the resource grid corresponds to an OFDM symbol and an OFDM subcarrier, respectively. The duration of the resource grid in the time domain corresponds to a time slot in the radio frame. The smallest time-frequency unit in the resource grid is represented as a resource element. Each resource grid may include multiple resource blocks, which describe the mapping of specific physical channels to resource elements. Each resource block includes a set of resource elements. Such resource blocks are used to convey several different physical downlink channels.

[0071] The physical downlink shared channel (PDSCH) may carry user data and higher layer signaling to the UE 106. The physical downlink control channel (PDCCH) may carry, among other things, information about the transport format and resource allocation associated with the PDSCH channel. It may also inform the UE 106 of the transport format, resource allocation, and HARQ (Hybrid Automatic Repeat Request) information associated with the uplink shared channel. Typically, downlink scheduling (assignment of control and shared channel resource blocks to the UE 102 within the cell) may be performed at any of the base stations 102 based on channel quality information fed back from any of the UEs 106. Downlink resource allocation information may be transmitted on the PDCCH for (e.g., assigned to) each of the UEs.

[0072] PDCCH can use control channel elements (CCE) to convey control information. Before being mapped to resource elements, PDCCH complex-valued symbols can first be organized into quaternions, which can then be arranged using a sub-block interleaver for rate matching. One or more of these CCEs can be used to send each PDCCH, where each CCE can correspond to four sets of nine physical resource elements, called resource element groups (REGs). Four quadrature phase shift keying (QPSK) symbols can be mapped to each REG. Depending on the size of the downlink control information (DCI) and channel conditions, one or more CCEs can be used to send PDCCH. There may be four or more different PDCCH formats defined in LTE with different numbers of CCEs (e.g., aggregation levels, L=1, 2, 4, or 8).

[0073] Description of the Sidelink (SL) communication link

[0074] In one or more embodiments, the SL communication link is a communication link established between terminals acting as UE devices. In the SL communication link, each of the aforementioned physical channels corresponds to a set of resource elements that carry information originating from a higher layer. These physical signals may include reference information signaling and synchronization information signaling. The reference information signaling may include reference information that uses a reference signal (e.g., a demodulation reference signal) to identify at least one terminal positioning reference. The positioning reference may be a terminal configured to obtain its absolute position on the earth or its position within a specific area. The synchronization information signaling may include synchronization information related to the allocation of resources for at least one synchronization signal.

[0075] In one or more embodiments, two UE devices communicating with each other may use a SL communication link to exchange SL transmissions. The SL communication link may be defined for 5G NR in TS 38.331 of the 3GPP standard.

[0076] Reference signals are used to provide baseline transmission information to multiple terminals, which can identify the baseline transmission information on the SL transmissions exchanged between each other. As described above, reference signals are predefined signals that occupy specific resource elements within the communication time-frequency grid. In the NR specification, multiple types of reference signals can be sent in different ways and are intended to be used by the receiving device for different purposes. In the present disclosure, reference signals are modified for specific implementations in SL transmissions.

[0077] Examples of synchronization information may include communication information related to the selection of resources for at least one synchronization signal. The first option for the synchronization signal may be a demodulation reference signal (DMRS) for PSCCH. In an orthogonal frequency division multiplexing (OFDM) symbol for PSSCH, the synchronization signal may be an associated DMRS. The second option for the synchronization signal may be a DMRS for a demodulation reference signal (DMRS) for PSSCH. The third option for the synchronization signal may be a phase tracking reference signal (PTRS) configured to track phase changes and compensate for phase noise during SL transmission, which may be used for higher carrier frequencies. The time density and frequency of the PTRS may be configured by an upper layer and may be configured according to a resource pool. The fourth option for the synchronization signal may be a channel state information reference signal (CSI-RS). CSI-RS may be used for channel sounding. The receiving device may measure the received CSI-RS and may then report the CSI back to the transmitter via PSSCH. CSI-RS may be configurable in both the time domain and the frequency domain. CSI-RS may be used to provide fine channel state information. The fifth option for the synchronization signal may be a synchronization signal (SS) / PSBCH block. The time slot in which the SS / PSBCH block is sent may be referred to as a sidelink synchronization signal block (S-SSB). The SS / PSBCH block may include PSBCH, a sidelink primary synchronization signal (SPSS), and a sidelink secondary synchronization signal (SSSS) symbol. The period of S-SSB transmission may be 16 frames, and within each period, the number N of S-SSB blocks in the S-SSB period is configured at the RRC. The selection range for N may vary based on the parameter set and the frequency range.

[0078] In one or more embodiments, the UE device is configured to handle concurrent sidelink and uplink / downlink transmissions. If any of the UE devices includes limited reception capabilities compared to the rest of the UE devices, the UE device may prioritize sidelink communication reception, sidelink discovery reception on carriers configured by the eNodeB, and lastly sidelink discovery reception on carriers not configured by the gNB.

[0079] The sidelink transmission may be organized into segments having a duration T f radio frames, each of which consists of 20 radio frames of duration T 时隙 The sidelink subframe consists of two consecutive time slots starting from an even time slot. The physical channel or signaling sent in the time slot can be described by a resource grid corresponding to a first number of subcarriers and a second number of single carrier (SC)-frequency division multiple access (FDMA) symbols.

[0080] In some embodiments, SL transmissions may be configured according to a resource allocation pattern provided by the gNB. The resource allocation pattern may provide for dynamic grants of sidelink resources, as well as grants of periodic sidelink resources that are semi-statically configured via sidelink configured grants. In order to improve the reliability of SL transmissions, a dynamic sidelink grant DCI may provide resources for one or more transmissions of a transport block. A grant configured via a sidelink may be a SL transmission that is configured to be used immediately by the UE device before these grants are released via RRC signaling. Before the radio link failure (RLF) detection timer expires, when a beam failure or physical layer problem occurs in the NR access link (Uu), the UE device may be allowed to continue to use this type of grant configured via the sidelink, and then fall back to the abnormal resource pool. Another type of grant configured via the sidelink may be a grant that is configured once and cannot be used until the gNB transmits a DCI to the UE device indicating that the grant is now valid and until another DCI indicates deactivation.

[0081] In a sidelink configured grant, the resources are a set of sidelink resources that recur periodically with the gNB matching the resources to those characteristics for V2X communications. Multiple configured grants may be configured to allow different services and communication types to be provided, etc. Modulation and Coding Scheme (MCS) information for dynamic and configured grants may optionally be provided or constrained by RRC signaling rather than DCI. The RRC may configure the exact MCS used or a range of MCSs. The MCS may also be left unconfigured. For situations where the RRC does not provide the exact MCS, the UE device may be left to select an appropriate MCS itself based on any knowledge it may have about the transport blocks to be sent and the sidelink radio conditions. The gNB scheduling activity may be driven by reports in which the UE device shares its sidelink communication characteristics with the gNB, or by requesting sidelink resource allocations from the gNB through a sidelink buffer status report (BSR) process similar to Uu.

[0082] In some embodiments, the SL transmission of the UE device may be configured according to a self-selected resource allocation mode (i.e., referred to as a resource selection mode hereinafter). The SL transmission may be sent by the UE device a certain number of times after the resource selection mode is selected or before the cause of resource reselection is triggered. The SL transmission may be performed to support unicast and multicast communications in the physical layer. The SL transmission may be configured to reserve resources to be used for multiple blind transmissions of a transport block or transmissions based on HARQ feedback. The SL transmission may be performed to select resources to be used for the initial transmission of a subsequent transport block.

[0083] In one or more embodiments, a resource allocation pattern selected for SL transmission may be implemented in a SL bandwidth part (BWP). A SL BWP may be a plurality of groups of contiguous resource blocks configured for SL transmission within a predetermined channel bandwidth. The configuration of the SL BWP and the SL resource pool is established by the RRC layer and provided to lower layers when activated. In a given frequency band, there may be at least one active SL BWP for a UE device at a time. The SL BWP may be defined by its frequency, bandwidth, subcarrier spacing (SCS), and cyclic prefix (CP). The SL BWP may define parameters common to all SL resource pools contained therein, namely, the number of symbols and start symbols used for SL in all time slots (except those with synchronization signal blocks (SSBs)), power control of the PSBCH, and the position of direct current (DC) subcarriers.

[0084] The SL BWP may have different lists of SL resource pools for transmit and receive to allow UE devices to transmit in one pool and receive in another pool. For transmit, there may be one pool for selected mode, one pool for scheduled mode (e.g., when the gNodeB assists with resource selection), and one pool for exception cases. These SL resource pools may be expected to be used for only transmit or receive, except when the SL feedback mechanism is activated, in which case the UE device may send an acknowledgement (ACK) message in the receive pool and receive an ACK message in the transmit pool.

[0085] In 5G NR technology, the SL resource pool may be located inside the SL BWP, which is defined by a set of consecutive resource blocks (RBs) in the frequency domain defined by an information element labeled sl-Rb-Number, which starts at an RB defined by an information element labeled sl-StartRBsubchannel. In addition, the SL resource pool may be divided into subchannels of a size defined by an information element labeled sl-SubchannelSize, which may take one of a plurality of values ​​(i.e., 10, 12, 15, 20, 25, 50, 75, and 100). Depending on the values ​​of sl-RB-Number and sl-SubchannelSize, some RBs inside the SL resource pool may not be used by the UE.

[0086] In the time domain, the SL resource pool has a number of available time slots that are configured by various parameters. In order to determine which time slots belong to the pool, a series of criteria can be applied. Time slots in which SSBs are sent cannot be used. The number and position of these time slots can be based on a predefined configuration. Time slots that are not selected for UL (for example, in the case of time division duplexing (TDD)) or where not all symbols are available (according to the SL BWP configuration) can also be excluded from the SL resource pool. Some time slots can be reserved so that the number of remaining time slots is a multiple of the bitmap length defined by the tag sl-TimeResource-r16 or Lbitmap, which can range from 10 bits to 160 bits. The reserved time slots can be distributed throughout a variable number of time slots. The bitmap sl-TimeResource-r16 can be applied to the remaining time slots to calculate the final set of identified / marked time slots belonging to the pool.

[0087] In some embodiments, the duration of each SL frame and SL subframe is 10 milliseconds (ms) and 1 ms, respectively. The SL frame and SL subframe may include a parameter set μ that may define the SCS, the number of time slots in a subframe, and a cyclic prefix option. In NR SL, the value of μ ranges from 0 to 3. In addition, the supported μ values ​​differ in different frequency bands. In the frequency domain, the SCS may be defined by a parameter set. In this regard, the SCS may be proportional to the parameter set. Within a SL subframe, the time slots may be numbered from 0 to N subframes. In NR, assuming that different UE devices may operate in different BWPs and use different parameter sets, common resource blocks may be used for devices to locate frequency resources within the carrier bandwidth.

[0088] In some embodiments, the UE device may allocate channel resources in a SL transmission with one or more BS devices and / or other UE devices. In one example, the UE device may receive configuration parameters for a SL transmission, which includes resources selected from a portion of an unlicensed spectrum. The configuration parameters may indicate a definition of an S-SSB transmission timing or an S-SSB frequency structure for the SL transmission. The UE device may perform a resource selection process that includes selecting resources for the SL transmission based on the S-SSB transmission timing or the S-SSB frequency structure.

[0089] Example Communication Device

[0090] Figure 2 An example simplified block diagram of a communication device 106 according to some aspects is illustrated. Note that Figure 2The block diagram of the communication device is only one example of a possible communication device. According to various aspects, in addition to other devices, the communication device 106 can be a UE device or terminal, a mobile device or mobile station, a wireless device or wireless station, a desktop computer or computing device, a mobile computing device (e.g., a laptop, a notebook or a portable computing device), a tablet computer and / or a combination of devices. As shown, the communication device 106 may include a group of components 200 configured to perform core functions. For example, the group of components may be implemented as a system on a chip (SOC), which may include parts for various purposes. Alternatively, the group of components 200 may be implemented as a separate component or a group of components for various purposes. The group of components 200 may be coupled to various other circuits of the communication device 106 (e.g., communicatively; directly or indirectly).

[0091] For example, the communication device 106 may include various types of memory (e.g., including NAND flash memory 210), input / output interfaces such as connector I / F 220 (e.g., for connecting to a computer system; a docking station; a charging station; input devices such as microphones, cameras, keyboards; output devices such as speakers; etc.), a display 260 that may be integrated with the communication device 106 or external to it, and wireless communication circuitry 230 (e.g., for LTE, LTE-A, NR, UMTS, GSM, CDMA2000, Bluetooth, Wi-Fi, NFC, GPS, etc.). In some aspects, the communication device 106 may include wired communication circuitry (not shown), such as a network interface card (e.g., for Ethernet connection).

[0092] Wireless communication circuitry 230 may be coupled (e.g., communicatively; directly or indirectly) to one or more antennas, such as antenna 235 as shown. Wireless communication circuitry 230 may include cellular communication circuitry and / or short- to medium-range wireless communication circuitry, and may include multiple receive chains and / or multiple transmit chains for receiving and / or transmitting multiple spatial streams, such as in a MIMO configuration.

[0093] In some aspects, as further described below, the cellular communication circuitry 230 may include one or more receive chains (including and / or coupled to (e.g., communicatively; directly or indirectly) dedicated processors and / or radio components) for multiple radio access technologies (RATs) (e.g., a first receive chain for LTE and a second receive chain for 5G NR). In addition, in some aspects, the cellular communication circuitry 230 may include a single transmit chain that can switch between radio components dedicated to specific RATs. For example, a first radio component may be dedicated to a first RAT (e.g., LTE) and may communicate with a dedicated receive chain and a transmit chain shared with a second radio component. A second radio component may be dedicated to a second RAT (e.g., 5G NR) and may communicate with a dedicated receive chain and a shared transmit chain. In some aspects, the second RAT is capable of operating at millimeter wave frequencies. Because the operating frequency of millimeter wave systems is higher than the typical frequency in LTE systems, signals in the millimeter wave frequency range are severely attenuated due to environmental factors. To help address this attenuation problem, millimeter wave systems typically utilize beamforming and include more antennas than LTE systems. These antennas can be organized into antenna arrays or panels consisting of individual antenna elements. These antenna arrays can be coupled to a radio link.

[0094] The communication device 106 may also include and / or be configured for use with one or more user interface elements.

[0095] The communication device 106 may also include one or more smart cards 245 , such as one or more Universal Integrated Circuit Cards (UICCs) 245 , that include Subscriber Identity Module (SIM) functionality.

[0096] As shown, SOC 200 may include processor 202, which may execute program instructions for communication device 106, and display circuit 204, which may perform graphics processing and provide display signals to display 260. Processor 202 may also be coupled to a memory management unit (MMU) 240, which may be configured to receive addresses from processor 202 and translate these addresses into locations in memory (e.g., memory 206, read-only memory (ROM) 250, NAND flash memory 210); and / or coupled to other circuits or devices, such as display circuit 204, wireless communication circuit 230, connector I / F 220, and / or display 260. MMU 240 may be configured to perform memory protection and page table translation or setup. In some aspects, MMU 240 may be included as part of processor 202.

[0097] As described above, the communication device 106 may be configured to communicate using wireless and / or wired communication circuits. As described herein, the communication device 106 may include hardware and software components for implementing any of the various features and techniques described herein. The processor 202 of the communication device 106 may be configured to implement part or all of the features described herein (e.g., by executing program instructions stored on a memory medium). Alternatively (or in addition), the processor 202 may be configured as a programmable hardware element, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC). Alternatively (or in addition), in combination with one or more of the other components 200, 204, 206, 210, 220, 230, 240, 245, 250, 260, the processor 202 of the communication device 106 may be configured to implement part or all of the features described herein.

[0098] In addition, as described herein, processor 202 may include one or more processing elements. Thus, processor 202 may include one or more integrated circuits (ICs) configured to perform the functions of processor 202. In addition, each integrated circuit may include circuits (e.g., a first circuit, a second circuit, etc.) configured to perform the functions of processor 202.

[0099] In addition, as described herein, the wireless communication circuit 230 may include one or more processing elements. In other words, the one or more processing elements may be included in the wireless communication circuit 230. Therefore, the wireless communication circuit 230 may include one or more integrated circuits (ICs) configured to perform the functions of the wireless communication circuit 230. In addition, each integrated circuit may include circuits (e.g., a first circuit and a second circuit, etc.) configured to perform the functions of the wireless communication circuit 230.

[0100] Example Base Station

[0101] Figure 3 An example block diagram of a base station 102 according to some aspects is illustrated. Note that Figure 3 Base stations are non-limiting examples of possible base stations. As shown, base station 102 may include processor 304, which may execute program instructions for base station 102. Processor 304 may also be coupled to a memory management unit (MMU) 340, which may be configured to receive addresses from processor 304 and convert these addresses into locations in memory (e.g., memory 360 and read-only memory (ROM) 350); or to other circuits or devices.

[0102] Base station 102 may include at least one network port 370. Network port 370 may be configured to couple to a telephone network and provide access to the telephone network described above. Figure 1Multiple devices (such as UE device 106) of the telephone network described in.

[0103] The network port 370 (or an additional network port) may also or alternatively be configured to couple to a cellular network, such as a core network of a cellular service provider. The core network may provide mobility-related services and / or other services to a plurality of devices, such as the UE devices 106. In some cases, the network port 370 may be coupled to a telephone network via the core network, and / or the core network may provide the telephone network (e.g., in addition to other UE devices served by the cellular service provider).

[0104] In some aspects, base station 102 may be a next generation base station (e.g., a 5G New Radio (5G NR) base station or "gNB"). In such aspects, base station 102 may be connected to a legacy evolved packet core (EPC) network and / or to an NR core (NRC) / 5G core (5GC) network. Furthermore, base station 102 may be considered a 5G NR cell and may include one or more transition and reception points (TRPs). Furthermore, a UE capable of operating in accordance with 5G NR may be connected to one or more TRPs within one or more gNBs.

[0105] The base station 102 may include at least one antenna 334, and may include multiple antennas. At least one antenna 334 may be configured to operate as a wireless transceiver, and may also be configured to communicate with the UE device 106 via the radio component 330. The antenna 334 communicates with the radio component 330 via a communication chain 332. The communication chain 332 may be a receive chain, a transmit chain, or both. The radio component 330 may be configured to communicate via various wireless communication standards, including 5G NR, LTE, LTE-A, GSM, UMTS, CDMA2000, and Wi-Fi, among others.

[0106] The base station 102 may be configured to perform wireless communications using multiple wireless communication standards. In some instances, the base station 102 may include multiple radio components that enable the base station 102 to communicate according to multiple wireless communication technologies. For example, as one possibility, the base station 102 may include an LTE radio component for performing communications according to LTE and a 5G NR radio component for performing communications according to 5G NR. In this case, the base station 102 may be able to operate as both an LTE base station and a 5G NR base station. When the base station 102 supports millimeter waves, the 5G NR radio component may be coupled to one or more millimeter wave antenna arrays or panels. As another possibility, the base station 102 may include a multimode radio component capable of performing communications according to any one of a plurality of wireless communication technologies (e.g., 5G NR and LTE, 5G NR and Wi-Fi, LTE and Wi-Fi, LTE and UMTS, LTE and CDMA2000, UMTS and GSM, etc.).

[0107] In addition, BS102 may include hardware and software components for implementing or supporting the specific implementation of the features described herein. The processor 304 of the base station 102 may be configured to implement or support the specific implementation of a part or all of the methods described herein (e.g., by executing program instructions stored on a memory medium). Alternatively, the processor 304 may be configured as a programmable hardware element (such as a field programmable gate array (FPGA)), or an application specific integrated circuit (ASIC) or a combination thereof. Alternatively (or in addition), in combination with one or more of the other components 330, 332, 334, 340, 350, 360, 370, the processor 304 of the BS102 may be configured to implement or support the implementation of some or all of the features described herein.

[0108] Furthermore, as described herein, processor 304 may include one or more processing elements. Thus, processor 304 may include one or more integrated circuits (ICs) configured to perform the functions of processor 304. Furthermore, each integrated circuit may include circuits (e.g., a first circuit and a second circuit, etc.) configured to perform the functions of processor 304.

[0109] Additionally, as described herein, radio 330 may include one or more processing elements. Thus, radio 330 may include one or more integrated circuits (ICs) configured to perform the functions of radio 330. Additionally, each integrated circuit may include circuits (e.g., a first circuit and a second circuit, etc.) configured to perform the functions of radio 330.

[0110] Example Cellular Communications Circuit

[0111] Figure 4An example simplified block diagram of a cellular communication circuit according to some aspects is illustrated. Note that Figure 4 The block diagram of the cellular communication circuitry of is only one example of possible cellular communication circuitry; other circuitry, such as circuitry that includes or is coupled to enough antennas for different RATs to perform uplink activities using separate antennas, or circuitry that includes or is coupled to fewer antennas (e.g., that can be shared between multiple RATs) is also possible. According to some aspects, the cellular communication circuitry 230 may be included in a communication device, such as the communication device 106 described above. As described above, the communication device 106 may be a UE device, a mobile device or station, a wireless device or station, a desktop computer or computing device, a mobile computing device (e.g., a laptop, notebook, or portable computing device), a tablet computer, and / or a combination of devices, among other devices.

[0112] The cellular communication circuitry 230 may be (e.g., communicatively; directly or indirectly) coupled to one or more antennas, such as antennas 235a, 235b, and 236 as shown. In some aspects, the cellular communication circuitry 230 may include dedicated receive chains (including and / or coupled to (e.g., communicatively; directly or indirectly) dedicated processors and / or radio components) for multiple RATs (e.g., a first receive chain for LTE and a second receive chain for 5G Nr). For example, Figure 4 As shown, the cellular communication circuit 230 may include a first modem 410 and a second modem 420. The first modem 410 may be configured to communicate according to a first RAT (e.g., such as LTE or LTE-A), and the second modem 420 may be configured to communicate according to a second RAT (e.g., such as 5G NR).

[0113] As shown, the first modem 410 may include one or more processors 412 and a memory 416 in communication with the processor 412. The modem 410 may communicate with a radio frequency (RF) front end 430. The RF front end 430 may include circuits for sending and receiving radio signals. For example, the RF front end 430 may include a receiving circuit (RX) 432 and a transmitting circuit (TX) 434. In some aspects, the receiving circuit 432 may communicate with a downlink (DL) front end 450, which may include circuits for receiving radio signals via an antenna 235a.

[0114] Similarly, the second modem 420 may include one or more processors 422 and a memory 426 in communication with the processor 422. The modem 420 may be in communication with the RF front end 440. The RF front end 440 may include circuits for sending and receiving radio signals. For example, the RF front end 440 may include a receiving circuit 442 and a transmitting circuit 444. In some aspects, the receiving circuit 442 may be in communication with the DL front end 460, which may include circuits for receiving radio signals via the antenna 235b.

[0115] In some aspects, the switch 470 may couple the transmit circuit 434 to an uplink (UL) front end 472. In addition, the switch 470 may couple the transmit circuit 444 to the UL front end 472. The UL front end 472 may include circuitry for transmitting radio signals via the antenna 236. Thus, when the cellular communication circuit 230 receives an instruction to transmit in accordance with a first RAT (e.g., as supported via the first modem 410), the switch 470 may be switched to a first state that allows the first modem 410 to transmit signals in accordance with the first RAT (e.g., via a transmit chain including the transmit circuit 434 and the UL front end 472). Similarly, when the cellular communication circuit 230 receives an instruction to transmit in accordance with a second RAT (e.g., as supported via the second modem 420), the switch 470 may be switched to a second state that allows the second modem 420 to transmit signals in accordance with the second RAT (e.g., via a transmit chain including the transmit circuit 444 and the UL front end 472).

[0116] As described herein, the first modem 410 and / or the second modem 420 may include hardware and software components for implementing any of the various features and techniques described herein. For example, by executing program instructions stored on a memory medium (e.g., a non-transitory computer-readable memory medium), the processors 412, 422 may be configured to implement some or all of the features described herein. Alternatively (or in addition), the processors 412, 422 may be configured as programmable hardware elements, such as an FPGA (field programmable gate array) or as an ASIC (application-specific integrated circuit). Alternatively (or in addition), in combination with one or more of the other components 430, 432, 434, 440, 442, 444, 450, 470, 472, 235, and 236, the processors 412, 422 may be configured to implement some or all of the features described herein.

[0117] In addition, as described herein, processors 412 and 422 may include one or more processing elements. Therefore, processors 412 and 422 may include one or more integrated circuits (ICs) configured to perform the functions of processors 412 and 422. In addition, each integrated circuit may include circuits (e.g., first circuits, second circuits, etc.) configured to perform the functions of processors 412 and 422.

[0118] In some aspects, the cellular communication circuit 230 may include only one transmit / receive chain. For example, the cellular communication circuit 230 may not include the modem 420, the RF front end 440, the DL front end 460, and / or the antenna 235b. As another example, the cellular communication circuit 230 may not include the modem 410, the RF front end 430, the DL front end 450, and / or the antenna 235a. In some aspects, the cellular communication circuit 230 may also not include the switch 470, and the RF front end 430 or the RF front end 440 may communicate with the UL front end 472, for example, directly.

[0119] Example SL Communication Link Management

[0120] SL communication links may be used to help reduce interference and help support a large number of wireless devices in proximity to each other. The SL communication links effectively allow for the sending and receiving of SL transmissions. In some embodiments, a beam is a representation of a communication shared between two wireless devices. These SL transmissions may be directed by each wireless device. In some embodiments, a SL transmission with a predetermined direction may be referred to as a beam. When a beam is directed toward an area that is relatively small compared to a cell wide signal, the wireless node needs to know where the wireless device is located relative to the wireless node to allow the wireless node to direct the beam toward the wireless device.

[0121] Example of a time slot structure

[0122] The time slot structure of the radio frame in SL transmission may include multiple different types of resources. In some embodiments, the resources are selected in a predetermined pattern including 10 PRBs / subchannels. The predetermined pattern may be a configuration for implementing SL transmission in 5G NR. The predetermined pattern may include resources selected for PSCCH, PSSCH, automatic gain control (AGC) symbols, GAP symbols, and PSFCH symbols including AGC training. In a time slot, the AGC symbol may be a copy of the next symbol. The AGC symbol may be used in a time slot to automatically control the increase in the amplitude of the radio frame.

[0123] In a time slot, the AGC symbol may be the first symbol in a time slot for AGC training, and the first sidelink symbol may be a copy of a second sidelink symbol. PSCCH may be a channel configured for sidelink control information. PSCCH may include SL control information (SCI) level 1, which has information related to resource allocation in the first level SCI A type as defined in TS 38.214 of the 3GPP standard. PSCCH may start from the second symbol in the time slot and may last for 2 or 3 symbols in the time domain. PSCCH may be pre-configured or dynamically assigned. PSCCH may occupy several consecutive PRBs in the frequency domain. PSCCH may be configured with candidate numbers including 10, 12, 15, 20 or 25 PRBs. The lowest PRB of PSCCH is the same as the lowest PRB of the corresponding PSSCH. PSSCH may be configured for sidelink data. The PSSCH may be configured to include second level SCI information regarding data transmission and feedback in SCI 2-A (e.g., unicast, groupcast, broadcast) and SCI 2-B (e.g., multicast) as defined in TS 38.214 of the 3GPP standard. A GAP symbol may be a symbol for a GAP (i.e., Tx / Rx switch) immediately following a PSSCH transmission. A PSFCH symbol may be configured for sidelink HARQ feedback. A timeslot may include a PSBCH that may be configured for sidelink broadcast information and an S-SSB for synchronization.

[0124] In some embodiments, a time slot is included in a SL BWP. A time slot may be part of a SL resource pool that includes a set of time-frequency resources for SL transmission and / or reception. A time slot may be used in SL transmissions involving unicast, multicast, and broadcast to a given UE device.

[0125] In 5G NR, PSCCH and PSBCH may include DMRS reused for resource mapping and sequencing. Sidelink CSI-RS may be refined in PSSCH. Sidelink CSI-RS configuration may be given from the UE device sending the sidelink CSI-RS via the PC5 interface. Sidelink PTRS may be refined in PSSCH. In addition, in 5G NR, UE devices may be configured with one or more reference signal information elements, such as those described in TS 38.211, TS 38.214, and TS 38.331 of the 3GPP standard.

[0126] In one or more embodiments, the terminal may receive configuration parameters from the core network (e.g., gNB), or may receive (pre-)configured parameters. The parameters may be definitions of one or more communication processes. The parameters may include configuration information for implementing a SL communication process, which SL communication process includes resources selected from a portion of an unlicensed spectrum. The terminal may be configured to determine a resource selection mode for the SL communication process based on the parameters. The terminal may identify a SL resource pool in the parameters. The parameters may be information for selecting resources to one or more PRBs, or information for indexing resources to one or more PRBs of a predetermined channel / subchannel. The parameters may be information for selecting time resources for multiple SL transmissions during the SL communication process. The SL transmission may be a reference FIG. 5A to FIG. 10 One of the SL transmissions described in detail.

[0127] FIG. 5A to FIG. 6C is a diagram illustrating an example of an S-SSB structure according to one or more embodiments. FIG. 5A to FIG. 5C In , resources are selected for various PSBCH positions (i.e., multiple PRBs), S-PSS positions, and S-SSS positions. FIG. 6A to FIG. 6C In some embodiments, the configuration parameters may define the SCS for S-SSB and for PSCCH / PSSCH resource selection. FIG. 5A to FIG. 6C An S-SSB structure is included in which PRBs are selected vertically in the frequency range (measured in Hertz (Hz)) and horizontally in the time domain (measured in seconds (s)).

[0128] like FIG. 5A to FIG. 5C As shown, a terminal configuring an S-SSB structure may know the SCS when acquiring a resource pool (pre) configuration. In the frequency domain, S-SSBs may be defined for two values ​​of the SCS. At SCS = 30 kilohertz (kHz), a single listen-before-talk ("LBT") channel of 20 megahertz (MHz) may include 50 or 51 PRBs. At the SCS, the S-PSS and S-SSS may each occupy 11 PRBs. In some embodiments, at the SCS, the PSBCH occupies 19 PRBs on one side of the S-PSS / S-SSS pair and 20 PRBs on the other side of the S-PSS / S-SSS. In other embodiments, the PSBCH occupies 19 PRBs on both sides of the S-PSS / S-SSS pair. In yet other modifications, the PSBCH occupies 20 PRBs on both sides of the S-PSS / S-SSS pair.

[0129] At SCS=15kHz, a single LBT channel of 20MHz may include between 100 and 106 PRBs (including end values). S-PSS and S-SS may each occupy 11 PRBs. In some embodiments, the PSBCH occupies 44 PRBs on one side of the S-PSS / S-SSS pair and 45 PRBs on the other side of the S-PSS / S-SSS pair. In other embodiments, the PSBCH occupies 44 PRBs on both sides of the S-PSS / S-SSS pair. In yet other embodiments, the PSBCH occupies 45 PRBs on both sides of the S-PSS / S-SSS pair. In another embodiment, the PSBCH includes an interlaced RB structure having the same number of PRBs as the number of PRBs for SCS=30kHz.

[0130] Figure 5A An example S-SSB structure with SCS=30kHz is illustrated. In this case, symbol 560A is equal to 4 symbols and total PRB 510A is equal to 50 PRBs. As described above, the PRB 580A selected for S-PSS 530A and S-SSS 540A is equal to 11 PRBs over a frequency range of 2 symbols each in the time domain. In addition, the PRB 590A selected for the first part of the PSBCH is equal to 20 PRBs. Then, the PRB 570A selected for the second part of the PSBCH 550A is equal to 19 PRBs.

[0131] Figure 5B An example S-SSB structure with SCS=15kHz is illustrated. In this case, symbol 560B is equal to 4 symbols and total PRB 510B is equal to 100 PRBs. As described above, PRB 580B selected for S-PSS 530B and S-SSS 540B is equal to 11 PRBs over a frequency range of 2 symbols each in the time domain. In addition, PRB 590B selected for the first part of the PSBCH is equal to 45 PRBs. Then, PRB 570B selected for the second part of the PSBCH 550B is equal to 44 PRBs.

[0132] Figure 5CAn example S-SSB structure with SCS=15kHz and an interleaving structure is illustrated. In this case, symbol 560C is equal to 4 symbols and the total number of PRBs used for PSBCH is equal to the same number of PSBCH PRBs when SCS=30kHz (e.g., 39 to 40 PRBs based on the S-SSB frequency structure). As described above, the PRBs 580C selected for S-PSS 530C and S-SSS 540C are equal to 11 PRBs over a frequency range of 2 symbols each in the time domain. In addition, when SCS=30kHz, the interleaving 595 selected for the first part of the PSBCH can be the same number of PRBs (e.g., 19 or 20 PRBs based on the S-SSB frequency structure). Similarly, the interleaving 575 selected for the second part of the PSBCH can be equal to 19 or 20 PRBs.

[0133] Go to FIG. 6A to FIG. 6C , the S-SSB structure can be equivalent to FIG. 5A to FIG. 5C Those structures described above, in which an AGC symbol is added. Therefore, an AGC symbol can be added in the S-SSB structure. The AGC symbol can be a copy of the first S-PSS symbol in the S-SSB structure of the last S-SSS symbol in the S-SSB structure.

[0134] Fig. 6A An example S-SSB structure with SCS=30kHz is illustrated. In this case, symbol 660A is equal to 5 symbols (e.g., 4 symbols plus AGC symbols as described above) and total PRB 610A is equal to 50 PRBs. As described above, the PRB 680A selected for S-PSS 630A and S-SSS 640A is equal to 11 PRBs over a frequency range of 2 symbols each in the time domain. In addition, the PRB 690A selected for the first part of the PSBCH is equal to 20 PRBs. Then, the PRB 670A selected for the second part of the PSBCH 650A is equal to 19 PRBs.

[0135] Figure 6B An example S-SSB structure with SCS=15kHz is illustrated. In this case, symbol 660B is equal to 5 symbols (e.g., 4 symbols plus AGC symbol as described above) and total PRB 610B is equal to 100 PRBs. As described above, the PRB 680B selected for S-PSS 630B and S-SSS 640B is equal to 11 PRBs over a frequency range of 2 symbols each in the time domain. In addition, the PRB 690B selected for the first part of the PSBCH is equal to 45 PRBs. Then, the PRB 670B selected for the second part of the PSBCH 650B is equal to 44 PRBs.

[0136] Figure 6C An example S-SSB structure with SCS=15kHz and an interleaving structure is illustrated. In this case, symbol 660C is equal to 5 symbols (e.g., 4 symbols plus AGC symbols as described above), and when SCS=30kHz, total PRB 610C is equal to the same PRB selection (e.g., 49 to 51 PRBs based on the S-SSB frequency structure). As described above, the PRB 680C selected for S-PSS630C and S-SSS 640C is equal to 11 PRBs over a frequency range of 2 symbols each in the time domain. In addition, when SCS=30kHz, the interleaving 695 selected for the first part of the PSBCH can be the same number of PRBs (e.g., 19 or 20 PRBs based on the S-SSB frequency structure). Similarly, the interleaving 675 selected for the second part of the PSBCH 650B can be equal to 19 or 20 PRBs.

[0137] Go to Figure 7 According to one or more embodiments, method 700 may be performed by a terminal that sends or receives a SL transmission. At 710, the flow chart begins with the terminal being configured to receive configuration parameters of a SL transmission, the SL transmission including resources selected from a portion of an unlicensed spectrum. The terminal may refer to FIG. 5A to FIG. 6C The method described receives parameters defining the S-SSB structure and the SCS.

[0138] At 720, the flow chart continues with the terminal being configured to perform a resource selection process in which resources are selected for SL transmission based on the SL transmission timing of the SL frequency structure. As defined above, the SL transmission timing may be an S-SSB transmission timing that defines a time domain position in the S-SSB structure. Similarly, the SL frequency structure may be an S-SSB frequency structure that defines a frequency range position in the S-SSB structure.

[0139] The flowchart ends at 730, where the terminal sends a SL transmission. The SL transmission may include resources configured according to the S-SSB structure. Figures 9 and 10 As shown, SL transmission can be configured to include multiple S-SSBs in the same time slot. A time slot with 14 symbols can include multiple S-SSBs configured for 4 symbols or 5 symbols including multiple S-AGC symbols.

[0140] Figure 8An example of an SL transmission 800 according to one or more embodiments is illustrated. In this example, a candidate S-SSB opportunity for the SL transmission 800 is selected in a time slot 810. The time slot 810 includes a symbol offset 830, a first S-SSB 820A, a symbol gap 840, and a second S-SSB 820B. In the SL transmission 800, the symbol offset 830 is located before the first S-SSB 820A at the beginning (e.g., the beginning) of the time slot 810. The symbol gap 840 may be located between the first S-SSB 820 and the second S-SSB 820B. In some embodiments, due to LBT failure, multiple S-SSB opportunities may be used to ensure that the S-SSB is transmitted in the time slot 810. The candidate S-SSB opportunity may be (pre-) configured based on configuration parameters associated with the SL resource pool or SL-BWP.

[0141] In some embodiments, the S-SSB structure may be (pre)configured for a 4-symbol or 5-symbol S-SSB structure. Multiple S-SSB opportunities in time slot 810 may be (pre)configured or predefined. The configurable number of S-SSB opportunities may be equal to 1, 2, or 3. At any given point, only a single S-SSB may need to be sent within time slot 810. The number of S-SSB opportunities in time slot 810 may depend on the SCS. In this case, a larger number of S-SSB opportunities may be selected for a higher SCS. The symbol positions of the S-SSB opportunities in time slot 810 may be (pre)configured. As Figure 8 As shown, the starting symbol position in the time slot 810 can be configured for the first S-SSB 820A and the gap between the two candidate S-SSB opportunities. The gap can be selected from the end or start symbol of the first S-SSB structure to the start symbol of the second S-SSB structure.

[0142] Go to Fig. 9 , shows an example of an SL transmission 900 according to one or more embodiments. In this example, a candidate S-SSB opportunity for the SL transmission 900 is selected in a time slot 910. The time slot 910 includes a 5-symbol S-SSB structure configuration for three S-SSBs. The time slot 910 includes a first S-SSB 920A, a second S-SSB 920B, and a third S-SSB 920C. Each S-SSB includes corresponding AGC symbols 930 to 930C. In order to allocate three 5-symbol transmissions, the AGC symbol 930B and the AGC symbol 930C may overlap with the last symbol in the S-SSB 940A and the last symbol in the S-SSB 940B, respectively. This configuration adds up to 13 symbols, which allows the last symbol in the time slot 910 to be used as a gap 950. As shown Fig. 9As shown, multiple 5-symbol S-SSB opportunities can be sent. In this S-SSB structure, the AGC symbol of the second SSB is the same as the last symbol of the first S-SSB. Similarly, the AGC symbol of the third S-SSB is the same as the last symbol of the second S-SSB. As a result, the last symbol of the time slot can be used as gap 950.

[0143] Fig.10 An example of a SL communication process 1000 according to one or more embodiments is illustrated. In the SL communication process 1000, multiple candidate S-SSB opportunities are configured for separate transmission in a dedicated time slot. Fig.10 , six S-SSB opportunities 1050A to 1050F are shown within two separate S-SSB bundles 1010A and 1010B. S-SSB bundle 1010A includes S-SSB opportunities 1050A to 1050C. S-SSB opportunity 1050A is separated from S-SSB opportunity 1050B by intra-beam gap 1030A. In addition, S-SSB opportunity 1050B is separated from S-SSB opportunity 1050C by intra-beam gap 1030B. Similarly, S-SSB bundle 1010B includes S-SSB opportunities 1050D to 1050F. S-SSB opportunity 1050D is separated from S-SSB opportunity 1050E by intra-beam gap 1030C. In addition, S-SSB opportunity 1050E is separated from S-SSB opportunity 1050F by intra-beam gap 1030D. As indicated by time slots 1020A and 1020B, each S-SSB in the SL communication process is transmitted over the entire time slot. In some embodiments, the communication may be implemented in time slots 1020A and / or 1020B. Figure 8 and Fig. 9 The S-SSB structure described above. The S-SSB beam 1010A is separated from the S-SSB beam 1010B by an inter-beam gap 1040, which extends from the first symbol of the S-SSB beam 1010A to a position just before the first symbol of the S-SSB beam 1010B.

[0144] In some embodiments, the candidate S-SSB opportunities may be (pre)configured according to a 4-symbol S-SSB structure, a 5-symbol S-SSB structure, or a full-slot S-SSB structure. In addition, the number of S-SSB slots in a bundle may be (pre)configured or predefined. It may only be necessary to send a single S-SSB within an S-SSB burst window. Fig.10In the example of , the number of S-SSB slots in a bundle may depend on the value of SCS. In some embodiments, a larger number of S-SSB slots may be used for higher SCS values. The time gaps between S-SSB slots in a bundle may be (pre)configured. The intra-bundle gaps may / may not include the first S-SSB slot. The number of S-SSB bundles in a given S-SSB periodicity may be (pre)configured or predefined. The S-SSB periodicity may be one of the periodicity values ​​described in TS 38.331 of the reference 3GPP standard.

[0145] In some embodiments, the number of S-SSB bundles may depend on the value of SCS. In these cases, a larger number of S-SSB bundles may be used for higher SCS values. The time gaps between S-SSB bundles may be (pre)configured. The inter-bundle gap may be between the first S-SSB time slot of the first S-SSB bundle and the first S-SSB time slot of the second S-SSB bundle. The gap may or may not include the first S-SSB time slot of the first S-SSB bundle.

[0146] Fig.11A and Fig. 11B Examples of configuring PSFCH transmissions to meet predetermined reporting requirements in accordance with one or more embodiments are illustrated. Fig.11A It is shown that resources 1100A are selected for each interlace so that adjacent cyclic shift pairs provide only increments of the index that are maintained on the same symbol. Fig. 11B It is shown that resources 1100B are selected for subsequent interleaving so that adjacent cyclic shift pairs continue to provide an increase in index. The index increases from the first interleaving to the second interleaving. Each interleaving is maintained on the same symbol. In some embodiments, in the case of interleaved PSFCH transmission, PSFCH capacity can be limited in multicast ACK / NACK feedback. In unicast or multicast NACK-only feedback, all terminals configured for reception ("Rx terminals") can use a single PSFCH resource. As a result, PSFCH capacity may be large enough. In multicast ACK / NACK feedback, each Rx terminal can transmit ACK or NACK in a dedicated PSFCH resource. In this case, multiple PSFCH resources may be required. In some embodiments, PSFCH transmission uses the same interleaving as the corresponding PSCCH / PSSCH transmission.

[0147] In the case where the PSFCH periodicity is greater than 1 time slot, different cyclic shift pairs may be selected for PSCCH / PSSCH transmissions on different time slots in the same interlace. In this case, multiple cyclic shift pairs are considered independent PSFCH resources. Each PSSCH transmission in an interlace may include a corresponding PSFCH interlace. All cyclic shifts in an interlace may belong to different PSFCH resources for PSSCH transmissions. In unicast or multicast with NACK-only feedback, a single cyclic shift may be used across the entire interlace. In multicast with ACK / NACK feedback, group members may share the PSFCH transmissions of an interlace. Each group member may share a PSFCH transmission based on a member ID (“M ID ”) and the physical layer source ID (“P ID ”) to determine the specific cyclic shift used for PSFCH transmission. The total number of PSFCH resources can be obtained based on the number of cyclic shift pairs N. If the PSSCH transmission occupies K interlaces, the total number of PSFCH resources can be given by K*N based on the SL resource pool (pre) configuration. The Rx terminal can determine the corresponding PSFCH resource (or cyclic shift) as (P ID +M ID )mod(N*K).

[0148] In one or more embodiments, the PSFCH resource occupies part of the interleaving in the multicast ACK / NACK feedback. In this case, in the multicast ACK / NACK feedback, multiple PRBs and cyclic shift pairs can be considered as independent PSFCH resources. Group members can share the interleaved PSFCH transmission. Each group member can share the interleaved PSFCH transmission based on its member ID (M ID ) and physical layer source ID (P ID ) determines which PRBs and cyclic shift pairs are used in the interlace for the PSFCH transmission for the member. In some embodiments, the interlace includes multiple (M) PRBs, and there may be multiple (N) cyclic shift pairs. In some embodiments, the total number of PSFCH resources may be given by M*N. The PSFCH resources may be indexed according to the frequency first, code second rule. If the PSSCH transmission occupies K interlaces, the total number of PSFCH resources may be given by K*M*N based on the SL resource pool (pre) configuration.

[0149] In one or more embodiments, each Rx terminal may send PSFCH transmissions on both common PSFCH resources and dedicated PSFCH resources. In this case, multiple (M) consecutive PSFCH resources may be used for common transmissions by all Rx terminals to meet the OCB requirement. These M consecutive PSFCH resources may occupy the entire interlace to meet the OCB requirement. In addition to transmitting on another dedicated PSFCH resource, each terminal may also transmit on these (M) consecutive common PSFCHs. ID +M ID )mod((M*K-1)*N) determines the PSFCH resource dedicated to the Rx terminal. The Rx terminal can send PSFCH transmissions only on the dedicated PSFCH resources. In some embodiments, the Rx terminal can determine its dedicated PSFCH resource as (P ID +M ID )mod(M*N*K). If the total number of Rx terminals is less than M, the interleaved remaining PRBs may be transmitted by a specific Rx terminal. The specific Rx terminal may be an Rx terminal configured with a minimum member ID, configured with a maximum member ID, or configured by higher layer signaling.

[0150] In one or more embodiments, a configurable number of PSFCH interlaces may be defined based on a number (A) of subchannels used for PSFCH transmission, a number (B) of time slots used for PSFCH periodicity, a number (C) of interlaces selected for PSFCH transmission, and a number (D) of cyclic shifts selected for corresponding PSFCH transmission. Each PSSCH may include a number (E) of PSFCH resources, where Where A is equal to the number of subchannels available for PSSCH transmission, B is equal to the number of periodic time slots in the PSFCH, C is equal to the number of PSFCH interlaces, and D is equal to the number of cyclic shift pairs. In some embodiments, the PSFCH periodicity can be B time slots (e.g., B=1, 2, 4). In addition, the total number of PSSCH resources corresponding to the PSFCH resources in the time slot is A*B. In some embodiments, only C interlaces are selected for PSFCH transmission. As a result, C may be less than or equal to A. In addition, C can be (pre-) configured for each SL resource pool. For C less than A, a portion of the interlace can be used for PSFCH transmission. In this regard, D cyclic shift pairs can be (pre-) configured for PSFCH transmission for the resource pool.

[0151] The PSFCH resources may be indexed based on cyclic shift pair selection or interleaving selection. The total number of PSFCH resources in a time slot may be defined by C*D. The PSFCH resources may be indexed based on cyclic shift pairs (code domain) or interleaving (frequency domain). In some embodiments, the PSFCH resources are indexed based on the rule of cyclic shift pairs (code domain) first and interleaving (frequency domain) second. In some embodiments, the PSFCH resources are indexed based on the rule of interleaving (frequency domain) first and cyclic shift pairs (code domain) second. For PSSCH transmission in time slot u, 0≤u≤B, and subchannel v, 0≤v≤A, the corresponding PSFCH resources are indexed as [(u+v*B)*E,(u+1+v*B)*E-1] or the corresponding PSFCH resources are indexed as [(v+u*A)*E,(v+1+u*A)*E-1]].

[0152] Go to Fig.12 , a flow chart is shown, which details a method 1200 for sending SL transmission according to one or more embodiments. In this example, method 1200 is performed by a terminal, which exchanges information via a SL communication link established with a base station and / or one or more neighboring terminals. [The SL transmission includes a physical sidelink feedback channel ("PSFCH") transmission that meets the occupied channel bandwidth ("OCB") / power spectral density ("PSD") requirements. The PSFCH transmission uses the same interleaving as the corresponding physical sidelink control channel ("PSCCH") / physical sidelink shared channel ("PSSCH") transmission]

[0153] At 1210, the flow chart begins with the terminal being configured to receive configuration parameters for a SL transmission, the SL transmission including resources selected from a portion of an unlicensed spectrum. The configuration parameters may indicate a resource selection mode for SL subchannels in the SL transmission. As described above, the unlicensed spectrum is a separate unlicensed frequency band in a bandwidth ranging between 4.1 gigahertz (GHz) and 7.125 GHz. [When the periodicity of a PSFCH transmission is greater than one slot, different cyclic shift pairs are selected for corresponding PSCCH / PSSCH transmissions on different slots and in the same interlace]

[0154] At 1220, the flow chart continues with the terminal performing a resource selection process in which resources are selected for SL transmission according to a resource selection mode.

[0155] The flow chart ends at 1230, where the terminal sends a SL transmission including resources selected according to a resource selection process. The resource selection process may include selecting resources for performing one or more PSFCH transmissions using a PSFCH resource that occupies a portion of an interlace in a multicast ACK / NACK feedback transmission.

[0156] The use of the conjunction term "and / or" is intended to represent all possible alternative forms of the conjunction "and" and the conjunction "or." For example, the sentence "the configuration of A and / or B" includes the meaning of the sentence "the configuration of A and B" and "the configuration of A or B."

[0157] It is understood that the use of personally identifiable information should be subject to privacy policies and practices that are generally recognized to meet or exceed industry or government requirements for maintaining user privacy. Specifically, personally identifiable information data should be managed and processed to minimize the risk of unintentional or unauthorized access or use, and the nature of the authorized use should be clearly stated to users.

[0158] Aspects of the present disclosure can be implemented in any of a variety of forms. For example, some aspects can be implemented as computer-implemented methods, computer-readable storage media, or computer systems. Other aspects can be implemented using one or more custom-designed hardware devices such as ASICs. Other aspects can be implemented using one or more programmable hardware elements such as FPGAs.

[0159] In some aspects, a non-transitory computer-readable storage medium may be configured such that it stores program instructions and / or data, where the program instructions, when executed by a computer system, cause the computer system to perform a method (e.g., any of the method aspects described herein, or any combination of the method aspects described herein, or any subset of any of the method aspects described herein, or any combination of such subsets).

[0160] In some aspects, a device (e.g., UE 106, BS 102) may be configured to include a processor (or a group of processors) and a memory medium, wherein the memory medium stores program instructions, wherein the processor is configured to read and execute the program instructions from the memory medium, wherein the program instructions are executable to implement any of the various method aspects described herein (or any combination of the method aspects described herein, or any subset of any method aspects of the method aspects described herein, or any combination of such subsets). The device may be implemented in any of a variety of forms.

[0161] Although the above aspects have been described in considerable detail, numerous variations and modifications will become apparent to those skilled in the art once the above disclosure is fully appreciated. It is intended that the following claims be interpreted to include all such variations and modifications.

Claims

1. A terminal, comprising: a receiver configured to receive configuration parameters for a sidelink (SL) transmission, the SL transmission comprising resources selected from a portion of an unlicensed spectrum, the configuration parameters indicating a definition of a sidelink synchronization signal block ("S-SSB") transmission timing or an S-SSB frequency structure for the SL transmission; a processor configured to perform a resource selection process, the resource selection process comprising selecting a resource for the SL transmission according to the S-SSB transmission timing or the S-SSB frequency structure; and A transmitter, wherein the transmitter is configured to send the SL.

2. The terminal according to claim 1, wherein: The S-SSB frequency structure includes a parameter set and resource selection information.

3. The terminal according to claim 2, wherein: The parameter set indicates that the subcarrier spacing is equal to a first value or a second value, and the first value is greater than the second value.

4. The terminal according to claim 3, wherein: The resource selection information selects a first amount of resources for a first portion of a physical sidelink broadcast channel ("PSBCH") and a second amount of resources for a second portion of the PSBCH.

5. The terminal according to claim 4, wherein: When the subcarrier spacing is equal to the first value, the resource selection information selects a first set of resources for the first part of the PSBCH, When the subcarrier spacing is equal to the second value, the resource selection information selects a second set of resources for the first part of the PSBCH, The second set of resources is equal to or greater than the first set of resources.

6. The terminal according to claim 5, wherein: The resource selection information indicates an interleaving structure for the second set of resources, the interleaving structure indicating whether the second set of resources is equal to or greater than the first set of resources.

7. The terminal according to claim 4, wherein: The first amount of resources is greater than the second amount of resources.

8. The terminal according to claim 4, wherein: The first amount of resources is equal to the second amount of resources.

9. The terminal according to claim 4, wherein: The first amount of resources is less than the second amount of resources.

10. The terminal according to claim 4, wherein: The resource selection information selects resources for an automatic gain control ("AGC") symbol, which is a copy of the first SL primary synchronization signal ("S-PSS") symbol or the last SL secondary synchronization signal ("S-SSS") symbol in the S-SSB frequency structure.

11. The terminal according to claim 1, wherein: The S-SSB transmission timing indicates the sidelink synchronization signal block ("S-SSB") timing structure used for the SL transmission.

12. The terminal according to claim 11, wherein: The S-SSB timing structure includes resource selection information, which defines at least one S-SSB opportunity in a time slot, and the number of S-SSB opportunities in the time slot is configured, pre-configured or pre-defined.

13. The terminal according to claim 12, wherein: The S-SSB opportunity includes a duration of four symbols or five symbols in the time slot, and the duration is configured, preconfigured or predefined.

14. The terminal according to claim 12, wherein: The resource selection information indicates a position in the time slot for a symbol offset, a first S-SSB opportunity, a symbol gap, and a second S-SSB opportunity, The symbol offset is at the beginning of the time slot and before the first S-SSB opportunity, and The symbol gap is between the first S-SSB opportunity and the second S-SSB opportunity.

15. The terminal according to claim 12, wherein: The S-SSB opportunity includes the duration of four symbols and one automatic gain control ("AGC") symbol in the time slot.

16. The terminal according to claim 15, wherein: The resource selection information indicates the positions of the first AGC symbol, the second AGC symbol, the third AGC symbol, the first S-SSB opportunity, the second S-SSB opportunity, the third S-SSB opportunity and the symbol gap in the time slot, the first AGC is at the beginning of the time slot and before the first S-SSB opportunity, the second AGC overlaps with a last symbol of the first S-SSB opportunity and precedes the second S-SSB opportunity, The third AGC overlaps with the last symbol of the second S-SSB opportunity and precedes the third S-SSB opportunity, and The symbol interval is the last symbol in the time slot.

17. The terminal according to claim 12, wherein: The resource selection information may be configured or pre-configured information.

18. The terminal according to claim 11, wherein: The S-SSB timing structure includes resource selection information, which defines multiple S-SSB time slot opportunities in multiple S-SSB bundles, and the number of the multiple S-SSB time slot opportunities in the S-SSB bundles and the number of the multiple S-SSB bundles are configured, pre-configured or predefined.

19. The terminal according to claim 18, wherein: The multiple S-SSB time slot opportunities in the multiple S-SSB bundles, the number of the multiple S-SSB time slot opportunities in the multiple S-SSB bundles, and the number of the multiple S-SSB bundles are configured, preconfigured or predefined.

20. The terminal according to claim 19, wherein: defining said number of said plurality of S-SSB bundles with reference to a predetermined S-SSB periodicity, and The number of the plurality of S-SSB bundles is based on a subcarrier spacing.

21. The terminal according to claim 18, wherein: The resource selection information indicates a position in the plurality of S-SSB beams for the plurality of S-SSB time slot opportunities, a plurality of intra-beam gaps, and at least one inter-beam gap, Two subsequent S-SSB time slot opportunities of the plurality of S-SSB time slot opportunities are separated by an intra-beam gap of the plurality of intra-beam gaps, and The inter-beam gap is located between the start of a first S-SSB time slot opportunity in a first S-SSB beam and the start of a first S-SSB time slot opportunity in a second S-SSB beam.

22. A method comprising any act or combination of acts substantially as described herein in the detailed description.

23. A method substantially as described herein with reference to each or any combination of the drawings included herein or with reference to each or any combination of the paragraphs in the detailed description.

24. A wireless device configured to perform any action or combination of actions substantially as described herein in a detailed embodiment comprised in the wireless device.

25. A wireless station configured to perform any action or combination of actions substantially as described herein in a detailed description comprised in said wireless station.

26. A non-transitory computer readable medium storing instructions that, when executed, cause performance of any action or combination of actions as substantially described herein in the detailed description.

27. An integrated circuit configured to perform any action or combination of actions as substantially described herein in the detailed description.

28. A method comprising any act or combination of acts substantially as described herein in the detailed description.

29. A method substantially as described herein with reference to each or any combination of the drawings included herein or with reference to each or any combination of the paragraphs in the detailed description.

30. A wireless device configured to perform any action or combination of actions substantially as described herein in a detailed embodiment comprised in the wireless device.

31. A wireless station configured to perform any action or combination of actions substantially as described herein in a specific embodiment comprised in the wireless station.

32. A non-transitory computer readable medium storing instructions that, when executed, cause performance of any action or combination of actions as substantially described herein in the detailed description.

33. An integrated circuit configured to perform any action or combination of actions as substantially described herein in the detailed description.

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