Multiplexed sidelink data for communication

Abstract

Aspects of the present disclosure relate to a user equipment (UE) for establishing a sidelink communication channel with a wireless network and performing time resource allocation and conflict handling of a channel state information reference signal (CSI-RS). The UE may receive a physical sidelink shared channel (PSSCH) signal via a sidelink communication, wherein the PSSCH includes one or more interleaved physical resource blocks. The UE may process the time-division multiplexed CSI-RS in one or more resource blocks to trigger the PSSCH signal.

Description

Technical Field

[0001]

[0013] Generally speaking, the techniques discussed below relate to wireless communication systems, and more specifically, the techniques discussed below relate to wireless sidelink communications. Background Art

[0002] The 3rd Generation Partnership Project (3GPP) New Radio (NR) supports operation in unlicensed spectrum, intelligent transportation systems, industrial IoT, non-terrestrial networks, and vehicle-to-everything (V2X) application layer services, among other services and capabilities. NR-based V2X builds on previous Long Term Evolution (LTE)-V2X iterations and provides advanced capabilities, primarily in the area of ​​low-latency use cases. Enhanced NR systems and new NR sidelinks are introduced for V2X to meet certain requirements, such as the need to have a flexible design to support services with low latency and high reliability requirements, along with support for higher capacity and better coverage.

[0003] As the demand for mobile broadband access and sidelink communications continues to grow, research and development continues to advance wireless communication technologies not only to meet the growing demand for mobile broadband access, but also to improve and enhance mobile communications. Accordingly, the present disclosure addresses techniques and means to improve sidelink communications. Summary of the invention

[0004] In order to provide a basic understanding of one or more aspects of the present disclosure, an overview of these aspects is provided below. The present disclosure is not an exhaustive review of all considered features of the present disclosure, and is neither intended to identify the key or important elements of all aspects of the present disclosure, nor is it intended to describe the scope of any or all aspects of the present disclosure. Its sole purpose is to present some concepts of one or more aspects of the present disclosure in a simplified form, as a preface to the more detailed description presented later.

[0005] In one example, a method for wireless communication at a user equipment (UE) is disclosed, the method comprising: establishing a sidelink communication channel, and receiving a time division multiplexed (TDM) channel state information reference signal (CSI-RS) mapped on a plurality of interleaved PSSCH resource blocks, wherein the mapped CSI-RS is interleaved with resource elements in at least a portion of the plurality of interleaved PSSCH resource blocks. The method may also include: processing the CSI-RS received on the plurality of interleaved PSSCH resource blocks, and determining a channel quality of the sidelink channel from the portion of the plurality of interleaved PSSCH resource blocks including the mapped CSI-RS based on the processing.

[0006] In another example, a user equipment (UE) for wireless communication is disclosed, comprising: at least one processor, and a memory coupled to the at least one processor, wherein the at least one processor and the memory are configured to: establish a sidelink communication channel, and receive a time division multiplexed (TDM) channel state information reference signal (CSI-RS) mapped on a plurality of interleaved PSSCH resource blocks, wherein the mapped CSI-RS is interleaved with resource elements in at least a portion of the plurality of interleaved PSSCH resource blocks. The at least one processor and the memory may also be configured to: process the CSI-RS received on the plurality of interleaved PSSCH resource blocks, and determine the channel quality of the sidelink channel from the portion of the plurality of interleaved PSSCH resource blocks including the mapped CSI-RS based on the processing.

[0007] In another example, a non-transitory computer-readable medium is disclosed that stores computer-executable code at a user equipment (UE), including code for causing a computer to perform the following operations: establish a sidelink communication channel, and receive a time division multiplexed (TDM) channel state information reference signal (CSI-RS) mapped on multiple interleaved PSSCH resource blocks, wherein the mapped CSI-RS is interleaved with resource elements in at least a portion of the multiple interleaved PSSCH resource blocks. The code can also be configured to: process the CSI-RS received on the multiple interleaved PSSCH resource blocks, and based on the processing, determine the channel quality of the sidelink channel from the portion of the multiple interleaved PSSCH resource blocks including the mapped CSI-RS.

[0008] In another example, a user equipment (UE) for wireless communication is disclosed, comprising: a unit for establishing a sidelink communication channel, and a unit for receiving a time division multiplexed (TDM) channel state information reference signal (CSI-RS) mapped on a plurality of interleaved PSSCH resource blocks, wherein the mapped CSI-RS is interleaved with resource elements in at least a portion of the plurality of interleaved PSSCH resource blocks. The UE may also include: a unit for processing the CSI-RS received on the plurality of interleaved PSSCH resource blocks; and a unit for determining, based on the processing, a channel quality of the sidelink channel from the portion of the plurality of interleaved PSSCH resource blocks including the mapped CSI-RS.

[0009] After reviewing the specific embodiments below, these and other aspects of the present disclosure will be more fully understood. When reviewing the following description of the specific, exemplary aspects of the present disclosure in conjunction with the accompanying drawings, other aspects and features will become apparent to those of ordinary skill in the art. Although the features of the present disclosure may be discussed relative to certain aspects and figures below, all aspects of the present disclosure may include one or more advantageous features discussed herein. In other words, although one or more aspects may be discussed as having certain advantageous features, one or more of these features may also be used in conjunction with the various aspects of the present disclosure discussed herein. In a similar manner, although exemplary aspects may be discussed below as devices, systems or methods, it should be understood that these exemplary aspects can be implemented in various devices, systems and methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic diagram of a wireless communication system;

[0011] Figure 2 is a conceptual diagram of an example of a wireless access network;

[0012] Figure 3 is a block diagram illustrating a wireless communication system supporting multiple-input multiple-output (MIMO) communication;

[0013] Figure 4 is a schematic diagram of the organization of radio resources in an air interface using orthogonal frequency division multiplexing (OFDM);

[0014] Figure 5 is a diagram of a physical sidelink broadcast channel (PSBCH) synchronization signal block (SSB);

[0015] Figure 6 is an illustration of NR sidelink transmission, where a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), and an associated physical sidelink feedback channel (PSFCH) are multiplexed in the time and frequency domains;

[0016] Figure 7 is a diagrammatic representation of resource block associations in subchannels of a physical sidelink shared channel (PSSCH) and a physical sidelink feedback channel (PSFCH);

[0017] Figure 8 is a diagram of physical sidelink shared channel (PSSCH) communication triggered by channel state information (CSI);

[0018] Fig. 9 is a diagram of a physical sidelink shared channel (PSSCH) utilizing a physical sidelink feedback channel (PSFCH) and resource blocks for a physical sidelink shared channel (PSSCH);

[0019] Fig.10 is a diagram of a physical sidelink shared channel (PSSCH) and a resource block of a physical sidelink shared channel (PSSCH) without utilizing a physical sidelink feedback channel (PSFCH);

[0020] Fig.11 is a diagram of a configuration for sidelink shared channel (PSSCH) conflict handling under an example;

[0021] Fig.12 is a diagram of a configuration for sidelink shared channel (PSSCH) conflict handling under another example;

[0022] Fig.13 is a block diagram illustrating an example of a hardware implementation of a UE using a processing system according to some aspects of the present disclosure;

[0023] Fig.14 is a block diagram illustrating sidelink baseband processing.

[0024] Fig.15 is a process flow for sidelink data communications; and

[0025] Fig.16 is used for Fig.15 0048] FIG. 10 is a process flow for an example of sidelink data communication with and without PSFCH. DETAILED DESCRIPTION

[0026] The specific embodiments described below in conjunction with the accompanying drawings are intended to be descriptions of various configurations, rather than to represent the only configurations that implement the concepts described herein. For the purpose of providing a comprehensive understanding of the various concepts, the specific embodiments include specific details. However, it is obvious to those skilled in the art that these concepts can be implemented without these specific details. In some cases, well-known structures and components are shown in the form of block diagrams to avoid obscuring these concepts.

[0027] Although various aspects are described in this application by illustrating some examples, it will be understood by those skilled in the art that additional implementations and use cases may occur in many different arrangements and scenarios. The aspects described herein can be implemented across many different platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, some aspects and / or uses may appear via integrated chip aspects and other devices based on non-module components (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail / purchasing equipment, medical equipment, devices with AI functions, etc.). Although some examples may or may not be specifically for use cases or applications, the wide applicability of the described aspects may occur. The implementation may have a range from chip-level or modular components to non-modular, non-chip-level implementations, and further relates to aggregated, distributed or OEM devices or systems incorporating one or more aspects of the present disclosure. In some practical settings, the device incorporating the described aspects and features may also necessarily include additional components and features for the implementation and implementation of the required and described aspects. For example, the transmission and reception of wireless signals necessarily include multiple components for analog and digital purposes (e.g., hardware components including antennas, RF chains, power amplifiers, modulators, buffers, processors, interleavers, adders / summers, etc.). It is intended that the aspects described herein can be implemented in a wide variety of devices, chip-level components, systems, distributed arrangements, end-user devices, etc., of various sizes, shapes, and configurations.

[0028] Self-organizing networks (SON) refer to mobile network automation and the minimization of human intervention in cellular / wireless network management. The goals of SON include: 1) introducing intelligence and autonomous adaptability to cellular networks; 2) reducing capital and operating expenditures; and 3) improving network performance in terms of network capacity, coverage, and services / experience provided. SON aims to improve spectrum efficiency, simplify management, and reduce operating costs of next-generation radio access networks (RAN).

[0029] Drive tests are used to collect data about mobile networks. This data is required for the configuration and maintenance of mobile networks, for example, regarding network capacity optimization, network coverage optimization, UE mobility optimization and Quality of Service (QoS) verification. To perform drive tests, manpower is required. However, these measurements only cover a small part of the network at all times and locations. Minimized Drive Testing (MDT) enables operators to utilize UEs to collect radio measurements and associated location information in order to evaluate network performance while reducing the operational expenditure associated with traditional drive testing. Thus, MDT allows the use of standard UEs to collect / log measurements and report the measurements to the operator, whereas traditional drive tests use highly developed measurement equipment.

[0030] In 3GPP NR, different types of UE reports for measurement results and events are developed for SON and MDT. For example, UE reports of measurement results and events can be for other scenarios, such as unified access control (UAC), which can enhance the user experience. UAC refers to a mechanism for regulating UE access to a network. For example, a network can perform access control to deny UE access or assign different types of priorities to different types of user applications. Therefore, aspects of the present disclosure relate to processes, content, and triggers for UE reporting of UAC-related events.

[0031] In one aspect, operations related to a UE reporting control measurement results (e.g., UAC measurement results) to a network will be described. For example, the UE receives a configuration from the network indicating one or more measurement results to be recorded. The UE then performs an attempt to access the network and records one or more measurement results associated with the attempt. The UE reports the availability of the one or more measurement results to the network after the attempt is performed. Thereafter, the UE receives a request for at least one of the one or more measurement results from the network, and if the request for the at least one measurement result is received, the at least one measurement result is reported to the network.

[0032] In another aspect, operations related to a network device receiving a report of control measurement results (e.g., UAC measurement results) from a UE will be described. For example, the network sends a configuration to the UE indicating one or more measurement results to be recorded. Then, the network device receives a report from the UE indicating the availability of one or more measurement results associated with an attempt to access the network device recorded by the UE. The network device determines to receive at least one measurement result of the one or more measurement results, and sends a request to the UE for receiving the at least one measurement result. Thereafter, the network device receives a report including the at least one measurement result in response to the request from the UE.

[0033] The various concepts presented throughout this disclosure may be implemented in a wide variety of telecommunication systems, network architectures and communication standards. Figure 1 , as a non-limiting illustrative example, various aspects of the present disclosure are shown with reference to a wireless communication system 100. The wireless communication system 100 includes three interacting domains: a core network 102, a radio access network (RAN) 104, and a user equipment (UE) 106. By means of the wireless communication system 100, the UE 106 may be enabled to communicate data with an external data network 110, such as (but not limited to) the Internet.

[0034] The RAN 104 may implement any suitable wireless communication technology or technologies to provide radio access to the UE 106. As an example, the RAN 104 may operate in accordance with the 3rd Generation Partnership Project (3GPP) New Radio (NR) specification, commonly referred to as 5G. As another example, the RAN 104 may operate under a mix of 5G NR and Evolved Universal Terrestrial Radio Access Network (eUTRAN) standards, commonly referred to as LTE. 3GPP refers to this hybrid RAN as the Next Generation RAN or NG-RAN. Of course, many other examples may be used within the scope of the present disclosure.

[0035] As illustrated, the RAN 104 includes a number of base stations 108. In broad terms, a base station is a network element in a radio access network that is responsible for transmission and reception to or from a UE in one or more cells. A base station may also be referred to differently by those skilled in the art as a base transceiver station (BTS), a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), an access point (AP), a Node B (NB), an eNode B (eNB), a gNode B (gNB), or some other suitable terminology in different technologies, standards, or contexts.

[0036] Also shown is a radio access network 104 that supports wireless communications for multiple mobile devices. The mobile devices are referred to as user equipment (UE) in the 3GPP standards, but may also be referred to as mobile stations (MS), user stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile user stations, access terminals (AT), mobile terminals, wireless terminals, remote terminals, handsets, terminals, user agents, mobile clients, clients, or some other appropriate terminology by those of ordinary skill in the art. A UE may be a device that provides access to network services to a user.

[0037] Within this document, a "mobile" device does not necessarily have the ability to move and can be stationary. The term mobile device or mobile device refers to a wide variety of devices and technologies. A UE may include a plurality of hardware structural components of a size, shape, and arrangement to facilitate communication; such components may include antennas, antenna arrays, RF chains, amplifiers, one or more processors, etc. electrically coupled to each other. For example, some non-limiting examples of mobile devices include mobile stations, cellular (cell) phones, smart phones, session initiation protocol (SIP) phones, laptops, personal computers (PCs), notebooks, netbooks, smartbooks, tablets, personal digital assistants (PDAs), and a wide variety of embedded systems (e.g., corresponding to the "Internet of Things" (IoT)). A mobile device may also be a car or other transportation vehicle, a remote sensor or actuator, a robot or robotic device, a satellite radio, a global positioning system (GPS) device, an object tracking device, a drone, a multi-axis aircraft, a quadcopter, a remote control device, a consumer and / or wearable device such as glasses, a wearable camera, a virtual reality device, a smart watch, a health or fitness tracker, a digital audio player (e.g., an MP3 player), a camera, a game console, etc. The mobile device may additionally be a digital home or smart home device, such as home audio, video and / or multimedia equipment, appliances, vending machines, smart lighting, home security systems, smart meters, etc. The mobile device may also be a smart energy device, security device, solar panel or solar array, municipal infrastructure equipment that controls power (e.g., smart grid), lighting, water, etc.; industrial automation and enterprise equipment; logistics controllers; agricultural equipment; military defense equipment, vehicles, aircraft, ships and weapons, etc. Further, the mobile device may provide connected medical or telemedicine support, such as health care at a distance. Telemedicine devices may include telemedicine monitoring devices and telemedicine management devices, whose communications may be given priority or priority access over other types of information, for example, in terms of priority access to the transmission of critical service data and / or the associated QoS of the transmission of critical service data.

[0038] Wireless communication between RAN 104 and UE 106 can be described as utilizing an air interface. Transmissions from a base station (e.g., base station 108) to one or more UEs (e.g., UE 106) over an air interface can be referred to as downlink (DL) transmissions. According to certain aspects of the present disclosure, the term downlink may refer to point-to-multipoint transmissions initiated at a scheduling entity (e.g., base station 108, further described below). Another way to describe the scheme may be to use the term broadcast channel multiplexing. Transmissions from a UE (e.g., UE 106) to a base station (e.g., base station 108) can be referred to as uplink (UL) transmissions. According to other aspects of the present disclosure, the term uplink may refer to point-to-point transmissions initiated at a scheduling entity (further described below; e.g., UE 106).

[0039] In some examples, access to the air interface may be scheduled, wherein a scheduling entity (e.g., a base station 108) allocates resources for communications between some or all devices and apparatuses within its service area or cell. Within the present disclosure, as further discussed below, a scheduling entity may be responsible for scheduling, allocating, reconfiguring, and releasing resources of one or more scheduled entities. That is, for scheduled communications, a UE 106 (which may be a scheduled entity) may use resources allocated by a base station / scheduling entity 108.

[0040] Base station 108 is not the only entity that can act as a scheduling entity. That is, in some examples, a UE can act as a scheduling entity to schedule resources for one or more scheduled entities (eg, one or more other UEs).

[0041] like Figure 1 As shown, a base station 108 may broadcast downlink traffic 112 to one or more UEs 106. Broadly speaking, a base station 108 is a node or device responsible for scheduling traffic in a wireless communication network, including downlink traffic 112 and (in some examples) uplink traffic 116 from one or more UEs 106 to the base station 108. On the other hand, a UE 106 is a node or device that receives downlink control information 114, including but not limited to scheduling information (e.g., grants), synchronization or timing information, or other control information from another entity in the wireless communication network, such as a base station 108.

[0042] Typically, the base stations 108 may include a backhaul interface for communicating with a backhaul portion 120 of the wireless communication system. The backhaul 120 may provide a link between the base stations 108 and the core network 102. Additionally, in some examples, the backhaul network may provide interconnections between the various base stations 108. Various types of backhaul interfaces may be employed, such as a direct physical connection using any suitable transport network, a virtual network, etc.

[0043] The core network 102 may be part of the wireless communication system 100 and may be independent of the radio access technology used in the RAN 104. In some examples, the core network 102 (e.g., 5GC) may be configured according to 5G standards. In other examples, the core network 102 may be configured according to 4G Evolved Packet Core (EPC) or any other suitable standard or configuration.

[0044] Now refer to Figure 2 , a schematic diagram of a RAN 200 is provided by way of example and not limitation. In some examples, the RAN 200 may be similar to that described above and in Figure 1 The geographic area covered by the RAN 200 may be divided into cellular regions (cells) that may be uniquely identified by a user equipment (UE) based on an identity broadcast from an access point or base station. Figure 2 Macro cells 202, 204, and 206 are shown, as well as a small cell 208, each of which may include one or more sectors (not shown). A sector is a sub-area of ​​a cell. All sectors within a cell are served by the same base station. A radio link within a sector may be identified by a single logical identifier belonging to the sector. In a cell divided into multiple sectors, multiple sectors within a cell may be formed by antenna groups, each antenna being responsible for communicating with a UE in a portion of the cell.

[0045] exist Figure 2 , two base stations 210 and 212 are shown in cells 202 and 204; and a third base station 214 is shown controlling a remote radio head (RRH) 216 in cell 206. That is, the base station may have an integrated antenna, or may be connected to an antenna or RRH by a feeder cable. In the example shown, when base stations 210, 212, and 214 support cells with large sizes, cells 202, 204, and 126 may be referred to as macro cells. In addition, a base station 218 is shown in a small cell 208 (e.g., a micro cell, a pico cell, a femto cell, a home base station, a home node B, a home eNodeB, etc.) that may overlap with one or more macro cells. In this example, since base station 218 supports cells with relatively small sizes, cell 208 may be referred to as a small cell. Cell sizing may be accomplished based on system design as well as component constraints.

[0046] It should be understood that the radio access network 200 may include any number of wireless base stations and cells. In addition, relay nodes may be deployed to extend the size or coverage area of ​​a given cell. Base stations 210, 212, 214, 218 provide wireless access points to the core network for any number of mobile devices. In some examples, base stations 210, 212, 214, and / or 218 may be similar to those described above and described in detail in the accompanying drawings. Figure 1 The base station / scheduling entity 108 shown in FIG.

[0047] Figure 2 Also included is a quadcopter or drone 220 that can be configured to act as a base station. That is, in some examples, the cell may not necessarily be stationary, and the geographic area of ​​the cell may move based on the location of a mobile base station (such as a quadcopter 220).

[0048] Within the RAN 200, cells may include UEs that may communicate with one or more sectors of each cell. In addition, each base station 210, 212, 214, 218, and 220 may be configured to provide access to the core network 102 (see FIG. 1 ) for all UEs in the respective cells. Figure 1 ) access point. For example, UE 222 and UE 224 can communicate with base station 210; UE 226 and UE 228 can communicate with base station 212; UE 230 and UE 232 can communicate with base station 214 through RRH 216; UE 234 can communicate with base station 218; and UE 236 can communicate with mobile base station 220. In some examples, UE 222, 224, 226, 228, 230, 232, 234, 236, 238, 240 and / or 242 can communicate with the above-described and Figure 1 The UE / scheduled entity 106 shown in FIG. 1 is the same as that shown in FIG.

[0049] In some examples, a mobile network node (eg, quadcopter 220 ) may be configured to function as a UE. For example, quadcopter 220 may operate within cell 202 by communicating with base station 210 .

[0050] In the radio access network 200, the ability of a UE to communicate independently of its location while moving is called mobility. The various physical channels between the UE and the radio access network are usually managed by an access and mobility management function (AMF, not shown). Figure 1 The AMF is established, maintained and released under the control of the core network 102 in the core network, and the AMF may include a security context management function (SCMF) that manages the security context of both control plane and user plane functions and a security anchor function (SEAF) that performs authentication.

[0051] In various aspects of the present disclosure, the radio access network 200 may use DL-based mobility or UL-based mobility to implement mobility and handover (i.e., transferring the UE's connection from one radio channel to another). In a network configured for DL-based mobility, during a call with a scheduling entity or at any other time, the UE may monitor various parameters of the signal from its serving cell and various parameters of neighboring cells. Based on the quality of these parameters, the UE may maintain communication with one or more of the neighboring cells. During this period, if the UE moves from one cell to another, or if the signal quality from the neighboring cell exceeds the signal quality from the serving cell for a given amount of time, the UE may perform a handover or handover from the serving cell to the neighboring (target) cell. For example, a UE 224 (shown as a vehicle, although any suitable form of UE may be used) may move from a geographic area corresponding to its serving cell 202 to a geographic area corresponding to a neighboring cell 206. When the signal strength or quality from the neighboring cell 206 exceeds the signal strength or quality of its serving cell 202 for a given amount of time, the UE 224 may send a report message indicating this to its serving base station 210. In response, UE 224 may receive a handover command, and the UE may undergo a handover to cell 206 .

[0052] In a network configured for UL-based mobility, the UL reference signal from each UE can be used by the network to select a serving cell for each UE. In some examples, base stations 210, 212, and 214 / 216 can broadcast a unified synchronization signal (e.g., a unified primary synchronization signal (PSS), a unified secondary synchronization signal (SSS), and a unified physical broadcast channel (PBCH)). UEs 222, 224, 226, 228, 230, and 232 can receive the unified synchronization signal, derive the carrier frequency and slot timing from the synchronization signal, and send an uplink pilot or reference signal in response to the derived timing. The uplink pilot signal sent by a UE (e.g., UE 224) can be received simultaneously by two or more cells (e.g., base stations 210 and 214 / 216) within the radio access network 200. Each of these cells may measure the strength of the pilot signal, and the radio access network (e.g., one or more of base stations 210 and 214 / 216 and / or a central node within a core network) may determine a serving cell for UE 224. As UE 224 moves through radio access network 200, the network may continue to monitor uplink pilot signals sent by UE 224. When the signal strength or quality of the pilot signal measured by a neighboring cell exceeds the signal strength or quality measured by the serving cell, network 200 may handover UE 224 from the serving cell to a neighboring cell with or without notifying UE 224.

[0053] Although the synchronization signals transmitted by base stations 210, 212 and 214 / 216 may be uniform, the synchronization signals may not identify a specific cell, but may identify a region of multiple cells operating on the same frequency and / or using the same timing. Since the number of mobility messages that need to be exchanged between the UE and the network can be reduced, the use of regions in 5G networks or other next generation communication networks implements an uplink-based mobility framework and improves the efficiency of both the UE and the network.

[0054] In various embodiments, the air interface in the radio access network 200 may use licensed spectrum, unlicensed spectrum, or shared spectrum. Licensed spectrum provides a dedicated portion of the spectrum, typically by virtue of a mobile network operator purchasing a license from a government regulator. Unlicensed spectrum provides a portion of the spectrum for shared use without the need for a government authorization license. Although some technical rules are still typically required to access unlicensed spectrum, access is typically available to any operator or device. Shared spectrum may fall between licensed and unlicensed spectrum, where technical rules or restrictions may be required to access the spectrum, but the spectrum may still be shared by multiple operators and / or multiple RATs. For example, a license holder of a portion of licensed spectrum may provide licensed shared access (LSA) to share the spectrum with other parties, such as obtaining access under conditions determined by the appropriate licensee.

[0055] In order to transmit on the radio access network 200 to obtain a low block error rate (BLER) while still achieving very high data rates, channel coding can be used. That is, wireless communications can generally use suitable error correction block codes. In a typical block code, an information message or sequence is decomposed into code blocks (CBs), and an encoder (e.g., a codec) at the transmitting device then mathematically adds redundancy to the information message. Utilizing this redundancy in the encoded information message can improve the reliability of the message, enabling correction of any bit errors that may occur due to noise.

[0056] In early 5G NR specifications, user data is encoded using quasi-cyclic low-density parity check (LDPC) with two different base maps: one base map for large code blocks and / or high code rates, and another base map for other cases. Control information and the physical broadcast channel (PBCH) are encoded using polar coding based on nested sequences. For these channels, puncturing, shortening, and repetition are used for rate matching.

[0057] However, it will be appreciated by those skilled in the art that any suitable channel code may be used to implement aspects of the present disclosure. Various embodiments of the base station (e.g., scheduling entity) 108 and the UE (e.g., scheduled entity) 106 may include suitable hardware and capabilities (e.g., encoders, decoders, and / or codecs) for wireless communication using one or more of these channel codes.

[0058] The air interface in the radio access network 200 may use one or more duplex algorithms. Duplex refers to a point-to-point communication link in which two endpoints can communicate with each other in two directions. Full-duplex means that both endpoints can communicate with each other at the same time. Half-duplex means that only one endpoint can send information to the other endpoint at a time. In a wireless link, a full-duplex channel usually relies on the physical isolation of the transmitter and the receiver and suitable interference elimination techniques. Full-duplex simulation is often implemented for a wireless link by using frequency division duplex (FDD) or time division duplex (TDD). In FDD, transmissions in different directions operate on different carrier frequencies. In TDD, transmissions in different directions on a given channel are separated from each other using time division multiplexing. That is, at some times, the channel is dedicated to transmissions in one direction, and at other times, the channel is dedicated to transmissions in another direction, where the direction can change very quickly, for example, several times per time slot.

[0059] The air interface in the radio access network 200 may use one or more multiplexing and multiple access algorithms to enable simultaneous communication of various devices. For example, the 5G NR specification provides multiple access for UL transmissions from UEs 222 and 224 to the base station 210, and in order to multiplex DL transmissions from the base station 210 to one or more UEs 222 and 224, orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) is utilized. In addition, for UL transmissions, the 5G NR specification provides support for discrete Fourier transform-spread-OFDM (DFT-s-OFDM) with CP (also known as single carrier FDMA (SC-FDMA)). However, within the scope of the present disclosure, multiplexing and multiple access are not limited to the above schemes, and may be provided using time division multiple access (TDMA), code division multiple access (CDMA), frequency division multiple access (FDMA), sparse code multiple access (SCMA), resource extension multiple access (RSMA), or other suitable multiple access schemes. In addition, multiplexing of DL transmissions from base station 210 to UE 222 and UE 224 may be provided using time division multiplexing (TDM), code division multiplexing (CDM), frequency division multiplexing (FDM), orthogonal frequency division multiplexing (OFDM), sparse code multiplexing (SCM), or other suitable multiplexing schemes.

[0060] In some examples, access to the air interface may be scheduled, wherein a scheduling entity (e.g., a base station) allocates resources (e.g., time-frequency resources) for communications between some or all devices and apparatuses within its service area or cell. Within the present disclosure, as further discussed below, a scheduling entity may be responsible for scheduling, allocating, reconfiguring, and releasing resources for one or more scheduled entities. That is, for scheduled communications, a UE or scheduled entity uses resources allocated by the scheduling entity.

[0061] The base station is not the only entity that can be used as a scheduling entity. That is, in some examples, the UE can be used as a scheduling entity to schedule resources for one or more scheduled entities (e.g., one or more other UEs). For example, UE 238 is shown as communicating with UEs 240 and 242. In some examples, UE 238 is used as a scheduling entity, and UEs 240 and 242 can be used as scheduled entities. In other examples, side links or other types of direct link signals can be transmitted directly between UEs without relying on scheduling or control information from another entity. For example, UEs 238, 240, and 242 can communicate via direct links in device-to-device (D2D), peer-to-peer (P2P), vehicle-to-everything (V2X), and / or in a mesh network. In the mesh network example, in addition to communicating with a scheduling entity (e.g., UE 238), UEs 240 and 242 can optionally communicate directly with each other.

[0062] In some examples, UE 238 can be a transmitting sidelink device that reserves resources on a sidelink carrier for transmitting sidelink signals to UEs 240 and 242 in a D2D or V2X network. Here, UEs 240 and 242 are each receiving sidelink devices. UEs 240 and 242 can then reserve additional resources on the sidelink carrier for subsequent sidelink transmissions.

[0063] In some examples, two or more UEs (e.g., UEs 226 and 228) within the coverage area of ​​serving base station 212 can communicate with base station 212 using cellular signals and communicate with each other using sidelink signals 227 without relaying the communications through the base station. In this example, base station 227 or one or both of UEs 226 and 228 can serve as a scheduling entity to schedule sidelink communications between UEs 226 and 228. For example, UEs 126 and 128 can transmit sidelink signals 227 within a vehicle-to-everything (V2X) network.

[0064] The two main technologies that V2X networks can use include dedicated short-range communications (DSRC) based on the IEEE 802.11p standard and cellular V2X based on LTE and / or 5G (New Radio) standards. For simplicity, various aspects of the present disclosure may relate to New Radio (NR) cellular V2X networks, referred to herein as V2X networks. However, it should be understood that the concepts disclosed herein may not be limited to a specific V2X standard, or may be directed to sidelink networks other than V2X networks.

[0065] In some aspects of the present disclosure, a base station / scheduling entity and / or a UE / scheduled entity may be configured for beamforming and / or multiple-input multiple-output (MIMO) techniques. Figure 3 An example of a wireless communication system 300 supporting MIMO is shown. In a MIMO system, a transmitter 302 includes multiple transmit antennas 304 (e.g., N transmit antennas), and a receiver 306 includes multiple receive antennas 308 (e.g., M receive antennas). Therefore, there are N×M signal paths 310 from the transmit antennas 304 to the receive antennas 308. Each of the transmitter 302 and the receiver 306 can be implemented, for example, within a base station / scheduling entity 108, a UE / scheduled entity 106, or any other suitable wireless communication device.

[0066] The use of such multi-antenna technology enables wireless communication systems to utilize the spatial domain to support spatial multiplexing, beamforming, and transmit diversity. Spatial multiplexing can be used to simultaneously send different data streams (also referred to as layers) on the same time-frequency resources. The data stream can be sent to a single UE to increase the data rate, or to multiple UEs to increase the overall system capacity, the latter of which is called multi-user MIMO (MU-MIMO). This is achieved by spatially precoding each data stream (i.e., multiplying the data stream by different weights and phase shifts) and then sending each spatially precoded stream through multiple transmit antennas on the downlink. The spatially precoded data stream arrives at a UE with a different spatial signature, and the different spatial signatures enable each of the UEs to recover one or more data streams destined for the UE. On the uplink, each UE sends a spatially precoded data stream, which enables the base station to identify the source of each spatially precoded data stream.

[0067] The number of data streams or layers corresponds to the rank of the transmission. Typically, the rank of the MIMO system 300 is limited to the lower of the number of transmit antennas or receive antennas 304 or 308. In addition, the channel conditions at the UE and other considerations (such as the available resources at the base station) can also affect the transmission rank. For example, the rank assigned to a particular UE on the downlink (and therefore the number of data streams) can be determined based on a rank indicator (RI) sent from the UE to the base station. The RI can be determined based on the antenna configuration on each receive antenna (e.g., the number of transmit antennas and receive antennas) and the measured signal to noise and interference ratio (SINR). For example, the RI can indicate the number of layers that can be supported under current channel conditions. The base station can use the RI together with resource information (e.g., the available resources and amount of data to be scheduled for the UE) to assign a transmission rank to the UE.

[0068] In a time division duplex (TDD) system, UL and DL are reciprocal because they each use different time slots of the same frequency bandwidth. Therefore, in a TDD system, the base station can assign a rank for DL ​​MIMO transmission based on UL SINR measurement results (e.g., based on a sounding reference signal (SRS) or other pilot signal sent from the UE). Based on the assigned rank, the base station can then send CSI-RS using a separate C-RS sequence for each layer to provide multi-layer channel estimation. From the CSI-RS, the UE can measure channel quality across layers and resource blocks, and feed back CQI and RI values ​​to the base station for updating the rank and assigning REs for future downlink transmissions.

[0069] In the simplest case, Figure 3 As shown, a rank-2 spatial multiplexing transmission on a 2×2 MIMO antenna configuration will send one data stream from each transmit antenna 304. Each data stream follows a different signal path 310 to each receive antenna 308. The receiver 306 can then use the received signal from each receive antenna 308 to reconstruct the data streams.

[0070] Will refer to Figure 4 Various aspects of the present disclosure are described with reference to the OFDM waveform schematically illustrated in FIG. It should be understood by those of ordinary skill in the art that various aspects of the present disclosure can be applied to DFT-s-OFDMA waveforms in substantially the same manner as described herein below. That is, although some examples of the present disclosure may focus on OFDM links for clarity, it should be understood that the same principles can also be applied to DFT-s-OFDMA waveforms.

[0071] In this disclosure, a frame refers to a duration of 10 ms used for wireless transmission, where each frame consists of 10 subframes of 1 ms each. On a given carrier, there may be one set of frames in the UL and another set of frames in the DL. Now referring to Figure 4 , shows an expanded view of an exemplary DL subframe 402, which shows an OFDM resource grid 404. However, as those skilled in the art will readily appreciate, the PHY transmission structure for any particular application may differ from the examples described herein according to any number of factors. Here, time is in units of OFDM symbols in the horizontal direction; and frequency is in units of subcarriers or tones in the vertical direction.

[0072] Resource grid 404 can be used to schematically represent the time-frequency resources of a given antenna port. That is, in a MIMO implementation with multiple available antenna ports, corresponding multiple resource grids 404 can be used for communication. Resource grid 404 is divided into multiple resource elements (RE) 406. RE (which is 1 subcarrier × 1 symbol) is the smallest discrete part of the time-frequency grid and contains a single complex value representing data or signals from a physical channel. Depending on the modulation used in a specific implementation, each RE can represent one or more information bits. In some examples, RE blocks can be referred to as physical resource blocks (PRBs), or more simply as resource blocks (RBs) 408, which contain any suitable number of consecutive subcarriers (also referred to as interleaving in this article) in the frequency domain. In one example, an RB can include 12 subcarriers, which is a number independent of the numerology used. In some examples, according to the numerology, an RB can include any suitable number of consecutive OFDM symbols in the time domain. In the present disclosure, it is assumed that a single RB (such as RB 408) corresponds entirely to a single communication direction (transmission or reception for a given device).

[0073] A UE typically uses only a subset of the resource grid 404. An RB may be the smallest resource unit that may be allocated to a UE. Thus, the more RBs scheduled for a UE, the higher the modulation scheme selected for the air interface, and the higher the data rate of the UE.

[0074] In this illustration, RB 408 is shown as occupying less than the entire bandwidth of subframe 402, with some subcarriers shown above and below RB 408. In a given embodiment, subframe 402 may have a bandwidth corresponding to any number of one or more RBs 408. Furthermore, in this illustration, RB 408 is shown as occupying less than the entire duration of subframe 402, although this is merely one possible example.

[0075] Each 1 ms subframe 402 may consist of one or more adjacent time slots. Figure 4 In the example shown, as an illustrative example, a subframe 402 includes four time slots 410. In some examples, a time slot can be defined according to a specified number of OFDM symbols with a given cyclic prefix (CP) length. For example, a time slot can include 7 or 14 OFDM symbols with a nominal CP. Other examples may include micro-time slots with a shorter duration (e.g., one or two OFDM symbols). These micro-time slots can be sent in some cases by occupying resources scheduled for ongoing time slot transmissions for the same or different UEs.

[0076] An expanded view of one of the time slots 410 shows the time slot 410 including a control region 412 and a data region 414. In general, the control region 412 may carry a control channel (e.g., PDCCH), and the data region 414 may carry a data channel (e.g., PDSCH or PUSCH). Of course, a time slot may contain all DL, all UL, or at least one DL portion and at least one UL portion. Figure 4 The simple structure shown in is merely exemplary in nature, and different slot structures may be used and may include one or more of each of the control region and the data region.

[0077] In OFDM, in order to maintain the orthogonality of the subcarriers or tones, the subcarrier spacing can be equal to the inverse of the symbol period. The digital scheme of the OFDM waveform refers to its specific subcarrier spacing and cyclic prefix (CP) overhead. A scalable digital scheme refers to the ability of the network to select different subcarrier spacings, and therefore, for each spacing, a corresponding symbol duration, including the CP length. Using a scalable digital scheme, the nominal subcarrier spacing (SCS) can be extended up or down by integer multiples. In this way, regardless of the CP overhead and the selected SCS, the symbol boundaries can be aligned at certain common multiples of the symbol (for example, at the boundaries of each 1ms subframe). The range of SCSs can include any suitable SCS. For example, a scalable digital scheme can support SCSs ranging from 15kHz to 480kHz.

[0078] Despite Figure 4 Although not shown in the figure, various REs 406 within RB 408 may be scheduled to carry one or more physical channels, including control channels, shared channels, data channels, etc. Other REs 406 within RB 408 may also carry pilot or reference signals, including but not limited to demodulation reference signals (DMRS), control reference signals (CRS), or sounding reference signals (SRS). These pilot or reference signals may specify that the receiving device perform channel estimation of the corresponding channel, which may enable coherent demodulation / detection of control and / or data channels within RB 408.

[0079] In some examples, time slot 410 may be used for broadcast or unicast communication. For example, broadcast, multicast, or groupcast communication may refer to point-to-multipoint transmission from one device (e.g., a base station, UE, or other similar device) to other devices. Here, broadcast communications are delivered to all devices, while multicast communications are delivered to multiple intended recipient devices. Unicast communication may refer to point-to-point transmission from one device to a single other device.

[0080] In the example of cellular communication on a cellular carrier via a Uu interface, for DL ​​transmission, a transmitting device (e.g., a base station 108) may allocate one or more REs 406 (e.g., within a control region 412) to carry DL control information 114 to one or more UEs 106, including one or more DL control channels that typically carry information originating from higher layers (e.g., a physical broadcast channel (PBCH), a physical downlink control channel (PDCCH), etc.). In addition, DL REs may be allocated to carry DL physical signals that typically do not carry information originating from higher layers. These DL physical signals may include a primary synchronization signal (PSS); a secondary synchronization signal (SSS); a demodulation reference signal (DM-RS); a phase tracking reference signal (PT-RS); a channel state information reference signal (CSI-RS), etc.

[0081] The synchronization signals PSS and SSS (collectively referred to as SS), and in some examples, the PBCH may be sent in an SS block comprising 4 consecutive OFDM symbols, the consecutive OFDM symbols being numbered via time indices in increasing order from 0 to 3. In the frequency domain, the SS block may extend over 240 consecutive subcarriers, the subcarriers being numbered via frequency indices in increasing order from 0 to 239. Of course, the present disclosure is not limited to this particular SS block configuration. Other non-limiting examples within the scope of the present disclosure may use more or less than two synchronization signals; may include one or more supplemental channels in addition to the PBCH; may omit the PBCH; and / or may use non-contiguous symbols for the SS block.

[0082] The PDCCH may carry downlink control information (DCI) for one or more UEs in a cell, including but not limited to power control commands, scheduling information, grants, and / or allocations of REs for DL ​​and UL transmissions.

[0083] In UL transmission, a transmitting device (e.g., UE 106) may utilize one or more REs 406 to carry UL control information 118 originating from higher layers to a base station 108 via one or more UL control channels (e.g., physical uplink control channel (PUCCH), physical random access channel (PRACH), etc.). In addition, UL REs may carry UL physical signals that typically do not carry information originating from higher layers, such as demodulation reference signals (DM-RS), phase tracking reference signals (PT-RS), sounding reference signals (SRS), etc. In some examples, the control information 118 may include a scheduling request (SR), i.e., a request for the base station 108 to schedule an uplink transmission. Here, in response to the SR sent on the control channel 118, the base station 108 may send downlink control information 114, which may schedule resources for uplink packet transmission. The UL control information may also include hybrid automatic repeat request (HARQ) feedback, such as an acknowledgement (ACK) or a negative acknowledgement (NACK), channel state information (CSI), or any other suitable UL control information. HARQ is a technique known to those of ordinary skill in the art, wherein the integrity of a packet transmission may be checked on the receiving side for accuracy, for example, using any suitable integrity checking mechanism, such as a checksum or cyclic redundancy check (CRC). If the integrity of the transmission is confirmed, an ACK may be sent, whereas if it is not confirmed, a NACK may be sent. In response to a NACK, the transmitting device may send a HARQ retransmission, which may implement catch-up combining, incremental redundancy, etc.

[0084] In addition to control information, one or more REs 406 may be allocated for user data or traffic data (e.g., within data region 414). Such traffic may be carried on one or more traffic channels, such as a physical downlink shared channel (PDSCH) for DL ​​transmissions or a physical uplink shared channel (PUSCH) for UL transmissions.

[0085] In order for the UE to obtain initial access to a cell, the RAN may provide system information (SI) that characterizes the cell. The system information may be provided using minimum system information (MSI) and other system information (OSI). The MSI may be broadcast periodically on the cell to provide the most basic information required for initial cell access, as well as for obtaining any OSI that may be broadcast periodically or sent on demand. In some examples, the MSI may be provided on two different downlink channels. For example, the PBCH may carry a master information block (MIB) and the PDSCH may carry a system information block type 1 (SIB1). In the art, SIB1 may be referred to as remaining minimum system information (RMSI).

[0086] OSI may include any SI not broadcast in MSI. In some examples, PDSCH may carry multiple SIBs, not limited to SIB1 discussed above. Here, OSI may be provided in these SIBs, such as SIB2 and above.

[0087] In an example of sidelink communication on a sidelink carrier via a ProSe PC5 interface, the control region 312 of the time slot 310 may include a physical sidelink control channel (PSCCH) including sidelink control information (SCI) sent by an initiating (transmitting) sidelink device (e.g., a V2X or other sidelink device) to a group of one or more other receiving sidelink devices. The data region 314 of the time slot 310 may include a physical sidelink shared channel (PSSCH) including data sent by the initiating (transmitting) sidelink device within resources reserved on the sidelink carrier of the transmitting sidelink device.

[0088] The above description and Figure 1 and Figure 4 The channels or carriers shown in are not necessarily all channels or carriers that can be used between the base station 108 and the UE 106, and one of ordinary skill in the art will recognize that other channels or carriers (such as other traffic, control, and feedback channels) may be used in addition to those shown.

[0089] These aforementioned physical channels are typically multiplexed and mapped to transport channels for processing at the medium access control (MAC) layer. Transport channels carry information blocks called transport blocks (TBs). Based on the modulation and coding scheme (MCS) and the number of RBs in a given transmission, the transport block size (TBS), which may correspond to the number of information bits, may be a controlled parameter.

[0090] Figure 55 is a schematic diagram of a physical sidelink broadcast channel (PSBCH) synchronization signal block (SSB) occupying a time slot 502, which includes a plurality of symbols 504 configured for NR sidelink communication. For NR sidelink communication, a sidelink bandwidth part (BWP) can be configured on the carrier, where the minimum unit for resource scheduling in the frequency domain is a subchannel, which may include 10, 15, 20, 25, 50, 75 or 100 consecutive RBs depending on the actual configuration. Regarding the physical channels and reference signals of the NR sidelink, the PSSCH may be sent by the sidelink transmitting UE, which transmits sidelink transmission data, a system information block (SIB) for radio resource control (RRC) configuration, and a portion of the sidelink control information (SCI). For the PSSCH, 16-quadrature amplitude modulation (QAM) and 64QAM with a low-density parity check (LDPC) code may be used, and 256QAM may also be applied, depending on the capabilities of the UE. The PSFCH may be transmitted by a sidelink receiving UE for unicast and multicast, and may transmit 1 bit of information on 1 RB for HARQ acknowledgement (ACK) and negative ACK (NACK). In some demonstrative embodiments, channel state information (CSI) may be carried in a medium access control (MAC) control element (CE) over the PSSCH instead of the PSFCH.

[0091] When the service to be sent to the receiving UE arrives at the sending UE, the sending UE may first send a PSCCH, which transmits data including part of the sidelink control information (SCI) to be decoded by any UE for channel sensing purposes, including time-frequency resources reserved for transmission, demodulation reference signal (DMRS) mode and antenna port, etc. For PSCCH, quadrature phase shift keying (QPSK) with polarity code may be used to send SCI. Another part of the SCI may carry the remaining scheduling and control information to be decoded by the target receiving UE, and may share the associated PSSCH resources and PSSCH DMRS, with an indication for resource allocation in the first stage SCI.

[0092] Similar to downlink transmission in NR, in sidelink transmission, primary and secondary synchronization signals (SPSS and SSSS, respectively) are supported, where M sequences and Gold sequences are used to generate SPSS and SSSS, respectively. By detecting SPSS and SSSS, the UE is able to identify the sidelink synchronization identifier (SSID) from the UE sending SPSS / SSSS, where there may be, for example, 2 SPSS sequences and 336 SSSS sequences, forming 672 SSIDs. By detecting SPSS / SSSS, the UE is therefore able to know the characteristics of the UE sending SPSS / SSSS. During the initial cell search, a series of processes to acquire timing and frequency synchronization together with the SSID of the UE can be performed. In some examples, the UE sending SPSS / SSSS may not have to participate in the sidelink transmission, and the node sending SPSS / SSSS (e.g., UE / eNB / gNB) can operate as a synchronization source.

[0093] Figure 5 The example of shows a time slot including a PSFCH symbol 506 followed by a plurality of SPSS symbols 508 and SSSS symbols 510 for synchronization. After synchronization, a plurality of PSBCH symbols 512 are provided, followed by an interval symbol 514 that can be used as a guard period. PSBCH 512 is transmitted as a synchronization signal / PSBCH block (SSB) together with SPSS / SSSS, as shown in the figure, which illustrates the structure of the SSB of the normal cyclic prefix (NCP). SSB can have the same digital scheme as PSCCH / PSSCH on the carrier, and SSB is transmitted within the bandwidth of the configured BWP. In some examples, PSBCH symbol data 512 transmits information related to synchronization, such as direct frame numbering (DFN), indications of time slots and symbol-level time resources for sidelink transmission, indicators within coverage, etc. SSB can be sent periodically, for example, every 160ms. In addition, there can be N repetitions within a 160ms period, with a configurable start offset and interval. N can be configured according to SCS. A physical reference signal, such as a channel state information reference signal (CSI-RS), may also be used for sidelink transmissions.

[0094] Figure 6is a schematic diagram of NR sidelink transmission, in which a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), and an associated physical sidelink feedback channel (PSFCH) are multiplexed in both the time domain and the frequency domain. In this example, the figure illustrates data for a subchannel 604 of a plurality of subchannels in the frequency domain occupying a time slot 602 of a plurality of time slots (shown as dashed lines) in the time domain. For NR sidelink transmission, multiplexing of PSCCH 608, PSSCH 612, and associated PSFCH 622 is illustrated in the figure, where PSCCH 608 and PSSCH 612 can be multiplexed in both the time domain and the frequency domain. It should be noted that in Figure 6 In the example of FIG. 6 , the PSSCH 612 is shown as occupying one subchannel ( 604 ), while the PSCCH may generally span multiple subchannels.

[0095] In an example, an automatic gain control (AGC) symbol 606 may be used to assist in adjusting the signal strength at the ADC input so that the signal SNR required for correct decoding is met. A PSCCH symbol 608 may occupy multiple consecutive RBs in the starting subchannel of a PSSCH transmission, for example, more than 2 or 3 symbols at the beginning of a time slot, while PSSCH 612, 616 may span multiple subchannels with associated DMRS symbols 610, 614, 618. In some examples, the last two symbols 622, excluding the gap (or guard period (GP)) 620, 624, are capable of accommodating a PSFCH at every, two, or four time slots. Given a certain time-frequency position of a PSSCH, candidate resources for the corresponding PSFCH should first be identified in order to identify the "actual" time-frequency position (resource) of the corresponding PSFCH.

[0096] Figure 7Schematic diagram 700 of resource block association (mapping) in subchannels of physical sidelink shared channel (PSSCH) and physical sidelink feedback channel (PSFCH). In this example, resources (RBs) in PSSCH 718 are shown as subchannels 1-4 (702-708) in time slot n and subchannels 1-4 (710-716) in time slot n+1. As shown along the frequency axis in the figure, subchannels (702-708, 710-716) are configured in their respective frequency bins. In this simplified example, HARQ resources in PSFCH 720 include HARQ resources for ACK 722 and HARQ resources for NACK 724, wherein the RBs for each subchannel in PSSCH (702-708, 710-716) are associated in PSFCH 720, as shown. For time slot n, it can be seen that subchannel 1 702 is associated with block "1" in each HARQ resource for ACK 722 and NACK 724. Similarly, subchannel 2 704 is associated with block "2" in each HARQ resource for ACK 722 and NACK 724. For time slot n+1, it can be seen that subchannel 1 710 and subchannel 2 712 are similarly associated with RBs "1" and "2", respectively, with subchannel 1 710 being represented by light shading in the figure and subchannel 2 712 being represented by darker shading in the figure.

[0097] For PSSCH transmission, the candidate resources of the corresponding PSFCH (720) can be configured as a set of RBs associated with the starting subchannel and time slot for the PSSCH (718). In a set of RBs configured for actual PSFCH transmission, the first x number of RBs are associated with the first subchannel in the first time slot associated with the PSFCH time slot, the second x number of RBs are associated with the first subchannel in the second time slot associated with the PSFCH time slot, and so on, as shown in the figure. The frequency resources used for the actual PSFCH transmission can be indicated by a bitmap of RBs in the resource (comb) pool. For each PSFCH, the resources for ACK and NACK can be separated.

[0098] Figure 8800 is a block diagram illustrating sidelink baseband processing under an illustrative example. An input is generated or received in block 802, which may include relevant communication data, including but not limited to a sidelink (SL) master information block (MIB-SL), a discovery transport block, SCI format 0 / 1, and a communication transport block. From here, the input undergoes sidelink baseband processing 816, generally designated as a dashed box in the figure. In some examples, a transport channel and layer 1 (L1) signaling processing block 804 assists in timing synchronization and system information acquisition, sidelink discovery, and sidelink communications, and performs processing of a broadcast transport channel (SL-BCH), a sidelink discovery transport channel (SL-DCH), and a sidelink communication transport channel (SL-DCH).

[0099] The transport channel and L1 signaling processing block 802 can be configured to perform code block segmentation and CRC additional processing, as well as transport block CRC additional processing. In addition, the transport channel and L1 signaling processing block 804 can perform channel coding, rate matching and interleaving before forwarding the communication signal to the physical channel processing block 806, which performs PSBCH, PSDCH, PSCCH and PSSCH processing. The physical channel processing block 806 can be configured to perform scrambling, modulation, transform precoding and mapping to physical resources before the signal is processed by the physical signal generation and modulation block 808, which includes SL-DMRS, PSSS and SSSS signal processing and other items. The physical signal generation and modulation block 808 participates in the demodulation of the reference signal and the processing of the synchronization preamble code so that the symbol is mapped to the physical resource and the signal is modulated using, for example, single carrier frequency division multiple access (SC-FDMA) before processing the signal for RF processing in box 812, and subsequent transmission is performed in box 812.

[0100] Typically, the broadcast transport channel SL-BCH and its physical counterpart PSBCH facilitate timing synchronization and system information acquisition. These channels can be considered similar to the BCH / PBCH broadcast channels used for cell and system acquisition support in LTE DL. These channels can be used to broadcast a set of preambles and basic system information within a certain area. A set of primary and secondary preambles (PSSS and SSSS) are used for synchronization purposes. The SL master information block MIB-SL carries sidelink system information. Sidelink discovery can be facilitated by the transport channel SL-DCH and its physical counterpart PSDCH. SL-DCH can follow the downlink shared channel structure. In some examples, there are no higher layer specifications in the discovery mode because the announcement message sent by the UE is a PHY transport block formed using zero MAC overhead. The padding TB payload can remain on and can depend on the application, such as proximity services (ProSe). The transport channel SL-SCH and its physical counterpart PSSCH can be used to facilitate sidelink communications. In order for the receiving UE to successfully decode the physical communication channel, information about the specific resources allocated for transmission and the transmission configuration is required, which is carried in the sidelink control channel (SCI) similar to the downlink DCI concept. SCI can be carried in the PSCCH channel and can be configured under SCI format 0 and / or SCI format 1. Physical channel estimation is achieved by SL demodulation reference signal (SL-DMRS). SL-DMRS can be multiplexed with the payload of PSBCH, PSDCH, PSCCH and PSSCH. In some examples, two DMRS symbols can be used in each subframe for PSBCH, PSDCH, PSCCH, PSSCH. In another example, three DMRS symbols can be used for PSBCH, and four symbols are used for PSCCH and PSSCH.

[0101] With respect to sidelink communications (e.g., 3GPP Rel-16 NR V2X), channel state information (CSI-RS) is configured as non-periodic and included in the PSSCH. Typically, only one resource element (RE) per resource block (RB) is provided (density 1), and only 1 or 2 ports are supported. For communications in unlicensed spectrum or bands (NR-U) (e.g., 5.125-7.125 GHz), interleaved waveforms are defined to meet occupied channel bandwidth (OCB) requirements in unlicensed bands. However, when the PSSCH is configured as an interleaved waveform, specific challenges regarding CSI-RS transmission may arise because, for example, in legacy systems (i.e., pre-3GPP Rel-16 NR), the CSI-RS waveforms may not match. Therefore, it is necessary to multiplex the legacy SL CSI-RS waveform with the PSSCH waveform. Interleaved CSI-RS waveforms are difficult to incorporate into the PSCCH because they add additional complexity to channel estimation. The CSI-RS in the sidelink is configured into a comb signal that occupies 1 or 2 consecutive REs in each RB for 1 or 2 channel ports, respectively. So, for example, if one port is being used, the CSI-RS occupies one RE in each RB, and if two ports are being used, the CSI-RS will occupy two consecutive REs in each RB. For example, for 1 port CSI-RS, comb resource mapping in the frequency domain can be used without CDM, where for a density of 1 or 0.5 RE / PRB, comb-12 can be used within a PRB, and for a density of 0.5RE / PRB, every other PRB can be mapped.

[0102] The UE may transmit sidelink CSI-RS within a PSSCH transmission, provided that CSI reporting is enabled by higher-level parameters and the CSI request field in the corresponding SCI format is triggered or set (e.g., to "1"). Parameters for CSI-RS transmission may be configured via higher-layer parameters, for example, to indicate the number of ports used for SL CSI-RS, the first OFDM symbol in a PRB used for SL CSI-RS, and / or the frequency domain allocation for SL CSI-RS.

[0103] Fig. 9900 is a schematic diagram of a physical sidelink shared channel (PSSCH) communication triggered by channel state information (CSI). In this example, a PSSCH interleaving structure is shown, in which multiple RBs 902 are shown, where the first PSSCH ("PSSCH1") is configured as an interleaved physical resource block (910, 912, 914), and the second PSSCH ("PSSCH 2") is also configured as an interleaved physical resource block (920, 922, 924) for different frequency bands. In some examples, each interlace (910-914, 920-924) can be used as a unit for scheduling PSSCH, one of which (e.g., PSSCH 1) or the other (e.g., PSSCH 2) can be used by one or more UEs. A person of ordinary skill in the art will understand that: Fig. 9 The examples are simplified examples, and additional or alternative RBs and / or interlaces may be used depending on the application. For example, using 20 MHz with a subcarrier spacing of 30 KHz, up to 5 interlaces may be supported for PSSCH, with up to 10 RBs available for each interlace.

[0104] In some examples, TDM for CSI-RS can be configured as the last symbol position in PSSCH. Fig. 9 In the example of , each CSI-RS 1 (904) is associated with PSSCH 1, and each CSI-RS 2 (906) is associated with PSSCH 2. Here, the CSI-RS are TDMed along the horizontal frequency axis using a RE comb structure (comb-12). For two ports, each CSI-RS (904, 906) can be TDMed using two consecutive REs per RB, as shown. In some examples, if CSI is triggered, the PSSCH is not sent at the last position of the traditional PSSCH. In some examples, rate matching can be performed.

[0105] Fig.10Schematic diagram of a resource block 1000 of a physical sidelink control channel (PSCCH) and a physical sidelink shared channel (PSSCH) utilizing a physical sidelink feedback channel (PSFCH). In this example, 1 RB (e.g., see 902) is shown, wherein the resource block 1000 includes PSCCH / PSSCH data 1002, CSI-RS 1004, and PSFCH data including gaps (1006, 1010) or guard bands before and after the signal. The CSI-RS 1004 is further decomposed in the figure to show the CSI-RS comb pool resource 1004. During operation, the CSI-RS is in the last symbol position of the PSSCH through TDM. If there is a PSFCH 1008 in the current time slot, the CSI-RS is mapped to the symbol before the gap (1006) before the PSFCH 1008.

[0106] Fig.11 1 is a schematic diagram of a resource block 1100 of a physical sidelink control channel (PSCCH) and a physical sidelink shared channel (PSSCH) without utilizing a physical sidelink feedback channel (PSFCH). Fig.10 , resource block 1100 includes PSCCH / PSSCH data 1102, CSI-RS 1104, and gap or guard band 1106. CSI-RS 1004 is further decomposed in the figure to show CSI-RS comb pool resources 1004. CSI-RS 1104 is further decomposed in the figure to show CSI-RS comb pool resources 1104. As mentioned above, PSFCH is not present in this example. In the absence of PSFCH, CSI-RS is mapped to the last symbol position in PSSCH, which is before the last gap in the configured side link symbol.

[0107] In some cases, CSI-RS may not be triggered all the time. Therefore, there may be a situation where the last PSSCH symbol does not necessarily need to be reserved for CSI-RS. For example, a CSI request in SCI 0-2 (second stage SCI 0) may be made to indicate whether the last PSSCH / DMRS symbol should be discarded. If CSI is triggered, CSI-RS may be mapped to the last symbol position of PSSCH, and the last PSSCH / DMRS symbol is discarded. In some configurations, DMRS is configured at the last symbol of PSSCH.

[0108] Alternatively or additionally, the PSSCH can be configured to always discard the last PSSCH / DMRS symbol, regardless of whether the CSI request is set, and the CSI-RS can be mapped to the last symbol position. In some configurations, the CSI request can be configured in the second stage of the SCI, and the DMRS channel estimation can be performed before decoding SCI 0-2. In this example, the CSI request can be used to dynamically control the mapping of the last symbol, which can advantageously reduce the PSSCH demodulation complexity and avoid potential conflicts with CSI-RS resource elements associated with other interleavings (e.g., 910, 920). In the upcoming configuration, the CSI request can be moved to SCI 0-1 and used to indicate whether the last PSSCH / DMRS is to be discarded. By moving the CSI request of the PSCCH, the receiving UE can determine the PSSCH and CSI-RS time allocation in advance and minimize the PSSCH demodulation complexity.

[0109] In some cases, the UE does not decode the SCI of other UEs before sending the PSSCH and PSCCH, and therefore may not know whether the CSI-RS associated with other interlaces is triggered. If the CSI-RS is not triggered for the current interlace, the use of the CSI request in SCI 0-2 as described above to indicate whether to discard the last PSSCH / DMRS maximizes resource utilization by sending the PSSCH / PSCCH in the potential CSI-RS symbol. Similarly, moving the CSI request to SCI 0-1 and using it to indicate whether to discard the last PSSCH / DMRS will have the same effect. However, when the CSI-RS is not triggered, there may be a situation where the UE will need to process the CSI-RS from another UE that is present in the last PSSCH symbol.

[0110] Fig.12 1200 is a diagram of a configuration for sidelink shared channel (PSSCH) conflict handling under an example. Figure 10-11 Similar to the example, Fig.12An RB (e.g., see 902) is shown including PSCCH / PSSCH data 1202, CSI-RS 1204, and gap resource elements 1206 for a receiving UE. When PSSCH is sent at a potential CSI-RS symbol position when CSI-RS is not triggered, the receiving UE can assume that the RE associated with the potential CSI-RS pool resource is punctured instead of its own RE. Therefore, in one example, a CSI request in SCI 0-2 or SCI 0-1 can be sent to indicate whether the last PSSCH / DMRS symbol is to be discarded where CSI-RS is not triggered. The comb pool resources 1210-1216 of CSI-RS 1204 can be configured as a transmit / receive pair, where the comb pool resources 1212-1216 represent three separate transmissions from three different other UEs and will be collectively considered (shown in dashed lines) as CSI-RS comb pool resources associated with other interlaces 1208. The receiving UE in this example will always assume that the REs associated with the potential CSI-RS pool resources are punctured instead of its own REs (1208). In this way, other UEs will not be able to trigger CSI-RS.

[0111] Fig.13 1300 is a diagram of a configuration for sidelink shared channel (PSSCH) conflict handling under another example. Fig.12 , which shows that one RB (e.g., see 902) includes PSCCH / PSSCH data 1302, CSI-RS 1304, and gap resource elements 1306 for a receiving UE. In one example, a CSI request in SCI 0-2 or SCI 0-1 may be sent to indicate whether the last PSSCH / DMRS symbol is to be discarded, where the CSI-RS is not triggered. The comb pool resources 1310-1316 of the CSI-RS 1304 may be configured as a transmit / receive pair, where the comb pool resources 1312-1316 represent three separate transmissions from three different other UEs. In this example, the receiving UE may be configured to decode the CSI-RS requests in all subchannels or interlaces before decoding the data in the PSSCH. Before decoding the data in the PSSCH, the receiving UE may need to decode SCI 0-2 in the interlace resource pool to determine whether any CSI-RS is triggered. Here, the UE may assume that the REs of the CSI-RS triggered when decoding the PSSCH are punctured in the last symbol. In some cases, it may be advantageous to move the CSI request to SCI 0-1 in the PSSCH, where the receiving UE can determine whether the CSI-RS is triggered when decoding the PSCCH, which is earlier than the second stage SCI (SCI 0-2).

[0112] In some examples, the CSI-RS resource pool association can be performed on an interleaved resource (e.g., 910, 920) with a PSSCH resource. Since the CSI-RS signal can be provided as a comb-12 waveform, 12 or 6 resources in the CSI-RS resource pool can be defined as having 12 or 6 comb offsets. For a one-port configuration, 12 comb offsets will be feasible, while for a two-port configuration, 6 comb offsets will be feasible. Therefore, each interleave can be associated with a CSI-RS comb offset. For example, the xth resource in the interleaved pool can be associated with a CSI-RS, resulting in a comb offset number x.

[0113] Fig.14 1400 using the processing system 1414. For example, the UE 1400 may be a Figure 1 and / or Figure 2 Any one or more of the user equipments (UEs) shown in the figures.

[0114] UE 1400 may be implemented with a processing system 1414 (or "processing device") including one or more processors 1404. Examples of processor 1404 include microprocessors, microcontrollers, digital signal processors (DSPs), field programmable gate arrays (FPGAs), programmable logic devices (PLDs), state machines, gating logic, discrete hardware circuits, and other appropriate hardware configured to perform the various functions described throughout the present disclosure. In various examples, UE 1400 may be configured to perform any one or more of the functions described herein, including but not limited to sidelink communications and processing. That is, processor 1404 (as used in UE 1400) may be used to implement any one or more of the processes and procedures described herein.

[0115] In this example, the processing system 1414 can be implemented with a bus architecture (which is generally represented by bus 1402). Bus 1402 can include any number of interconnecting buses and bridges, depending on the specific application of the processing system 1414 and the overall design constraints. Bus 1402 communicatively couples various circuits including one or more processors (generally represented by processor 1404), memory 805, and computer-readable media (generally represented by computer-readable media 1406). Bus 1402 can also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits together, which are well known in the art and will not be described further. Bus interface 1408 provides an interface between bus 1402 and transceiver 1410. Transceiver 1410 provides a communication interface or a unit for communicating with various other devices on a transmission medium. Depending on the characteristics of the device, a user interface 1412 (e.g., keyboard, display, speaker, microphone, joystick) may also be provided. Of course, such a user interface 1412 is optional and can be omitted in some examples (such as base stations).

[0116] In some aspects of the present disclosure, processor 1404 may include sidelink processing circuitry 1416 configured to implement, for example, the communications and sidelink processing described herein, such as described above in Figure 4-Figure 8 The time resource allocation circuit 1418 may be configured, for example, to implement time resource allocations, such as those described herein, and as described above in Figure 8-Figure 11 The conflict handling circuit 1420 may be configured, for example, to implement conflict handling, such as those described herein, and above in Figure 8 and Figure 12-13 The processor 1404 is responsible for managing the bus 1402 and general processing, including executing software stored on the computer-readable medium 1406. When the processor 1404 executes the software, the software causes the processing system 1414 to perform the various functions described below for any particular device. The computer-readable medium 1406 and the memory 1405 can also be used to store data manipulated by the processor 1404 when executing the software.

[0117] One or more processors 1404 in the processing system 1414 may execute software. Whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise, software should be construed broadly to mean instructions, instruction sets, codes, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executables, execution threads, procedures, functions, etc. The software may reside on a computer-readable medium 1406. The computer-readable medium 1406 may be a non-transitory computer-readable medium. By way of example, non-transitory computer readable media include magnetic storage devices (e.g., hard disks, floppy disks, tapes), optical disks (e.g., compact discs (CDs) or digital versatile discs (DVDs)), smart cards, flash memory devices (e.g., cards, sticks, or key drives), random access memory (RAM), read-only memory (ROM), programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), registers, removable disks, and any other suitable medium for storing software and / or instructions that can be accessed and read by a computer. The computer readable medium 1406 may be located within the processing system 1414, external to the processing system 1414, or distributed among multiple entities including the processing system 1414. The computer readable medium 1406 may be embodied in a computer program product. By way of example, a computer program product may include a computer readable medium in packaging materials. Those skilled in the art will recognize how to best implement the described functionality presented throughout this disclosure depending on the specific application and the overall design constraints imposed on the entire system.

[0118] In one or more examples, the computer-readable storage medium 1406 may include sidelink instructions 1422 configured for various functions, including, but not limited to, sidelink processing associated with the functionality of the sidelink processor 1416. The computer-readable storage medium 1406 may also include time resource allocation instructions 1424 configured for various functions, including, but not limited to, time resource allocation associated with the functionality of the time resource allocation circuit 1418. The computer-readable storage medium 1406 may also include conflict handling instructions 1426 configured for various functions, including, but not limited to, conflict handling functions associated with the conflict handling circuit 1420.

[0119] Of course, in the above examples, the circuits included in the processor 1414 are provided only as examples, and other units for performing the described functions may be included in various aspects of the present disclosure, including but not limited to instructions stored in the computer-readable storage medium 1406, or in Figure 1-Figure 3 Any other suitable devices or units depicted in any of the Figures in the accompanying drawings, and utilizing, for example, the processes and / or algorithms described herein.

[0120] Fig.15 1500 is a process flow for sidelink data communication using the above-mentioned techniques and means. In box 1502, a device (e.g., a UE) establishes a sidelink communication channel (e.g., with another UE). In box 1504, the device may generate a PSSCH (e.g., 1000, 1100) via the sidelink communication channel, wherein the PSSCH may include one or more interleaved physical resource blocks. In box 1506, the device may time-division multiplex (TDM) CSI-RS in one or more resource blocks in the physical resource block of the PSSCH signal to trigger the CSI-RS. As discussed in more detail above, the TDM CSI-RS may occupy one resource element or two consecutive resource elements in each resource block of one or more resource blocks. In box 1508, the device may send the PSSCH and the TDMed SCI-RS to the sidelink communication channel. The CSI-RS may be mapped to the last symbol position of the PSSCH. The CSI-RS may be received as sidelink control information (SCI) in the first stage (SCI 0-1) or the second stage (SCI 0-2), where the CSI-RS may be configured to indicate whether the last PSSCH symbol is to be dropped.

[0121] Fig.16 is used for Fig.15 1600 is a process flow diagram of an example of sidelink data communication with and without PSFCH. As explained above, the PSSCH may or may not include the PSFCH. In decision block 1602, a determination is made as to whether the PSSCH includes the PSFCH (see Fig.10 )(See Fig.11 ). If PSFCH exists ("Yes"), CSI-RS is mapped to the symbol before PSFCH. If not ("No"), CSI-RS is mapped to the last symbol position of PSSCH.

[0122] Several aspects of wireless communication networks have been presented with reference to exemplary implementations. As those skilled in the art will readily appreciate, various aspects described throughout this disclosure may be extended to other telecommunication systems, network architectures and communication standards.

[0123] For example, various aspects may be implemented within other systems defined by 3GPP, such as Long Term Evolution (LTE), Evolved Packet System (EPS), Universal Mobile Telecommunications System (UMTS), and / or Global System for Mobile (GSM). Various aspects may also be extended to systems defined by the Third Generation Partnership Project 2 (3GPP2), such as CDMA2000 and / or Evolution-Data Optimized (EV-DO). Other examples may be implemented within systems employing IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE802.20, Ultra Wideband (UWB), Bluetooth, and / or other suitable systems. The actual telecommunication standard, network architecture, and / or communication standard used will depend on the specific application and the overall design constraints imposed on the system.

[0124] In the present disclosure, the word "exemplary" is used to mean "serving as an example, instance or illustration". Any implementation or aspect described as "exemplary" in this article is not necessarily to be interpreted as being preferred or more advantageous than other aspects of the present disclosure. Similarly, the term "aspect" does not require that all aspects of the present disclosure include the discussed features, advantages or modes of operation. The term "coupled" is used herein to refer to a direct or indirect coupling between two objects. For example, if object A physically contacts object B, and object B contacts object C, objects A and C can still be considered to be coupled to each other - even if they are not directly physically in contact with each other. For example, a first object may be coupled to a second object, even if the first object has never been in direct physical contact with the second object. The terms "circuit" and "circuitry" are used in a broad sense and are intended to include both hardware implementations of electronic devices and conductors (when they are connected and configured, they can achieve the performance of the functions described in the present disclosure, without limitation on the type of electronic circuits) and software implementations of information and instructions (when executed by a processor, they can achieve the performance of the functions described in the present disclosure).

[0125] You can Figure 1-Figure 16 One or more of the components, steps, features, and / or functions shown in the present invention may be rearranged and / or combined into a single component, step, feature, or function, or may be embodied in several components, steps, or functions. Additional elements, components, steps, and / or functions may also be added without departing from the novel features disclosed herein. Figure 1-Figure 16 The apparatus, devices and / or components shown in the can be configured to perform one or more of the methods, features or steps described herein. The novel algorithms described herein can also be effectively implemented in software and / or embedded in hardware.

[0126] It should be understood that the specific order or hierarchy of steps in the disclosed methods is an illustration of an exemplary process. It should be understood that the specific order or hierarchy of steps in these methods may be rearranged based on design preferences. The accompanying method claims present elements of the various steps in an example order, and are not meant to be limited to the specific order or hierarchy presented unless specifically stated therein.

[0127] The previous description is provided to enable any person skilled in the art to implement the various aspects described herein. Various modifications to these aspects are obvious to those skilled in the art, and the general principles defined herein can be applied to other aspects. Therefore, the claims are not intended to be limited to the aspects shown herein, but are consistent with the entire scope of protection of the claim language, wherein, unless otherwise specified, references to elements in the singular form are not intended to mean "one and only one", but "one or more". Unless otherwise specifically stated, the term "some" refers to one or more. The phrase "at least one" referring to a list of items refers to any combination of these items, including a single member. For example, "at least one of a, b or c" is intended to cover: a; b; c; a and b; a and c; b and c; and a, b and c. All structures and functions equivalent to the elements of the various aspects described throughout the present disclosure that are known or to be known to those of ordinary skill in the art are hereby expressly incorporated herein by reference, and are intended to be included in the claims. In addition, whether or not the disclosure is explicitly recorded in the claims, the content disclosed herein is not intended to be dedicated to the public.

Claims

1. A method for wireless communication at a user equipment (UE), comprising: establishing a sidelink communication channel; receiving a time division multiplexed (TDM) channel state information reference signal (CSI-RS) mapped on a plurality of interleaved PSSCH resource blocks, wherein the mapped CSI-RS is interleaved with resource elements in at least a portion of the plurality of interleaved PSSCH resource blocks; processing the CSI-RS received on the plurality of interleaved PSSCH resource blocks; and According to the processing, a channel quality of the sidelink communication channel is determined from the portion of the plurality of interleaved PSSCH resource blocks including the mapped CSI-RS.

2. The method according to claim 1, wherein: The TDM CSI-RS occupies one resource element in each of one or more resource blocks.

3. The method according to claim 1, wherein: The TDM CSI-RS occupies two consecutive resource elements in each resource block of one or more resource blocks.

4. The method according to claim 1, wherein: The PSSCH resource block includes one or more physical sidelink feedback channel (PSFCH) resources associated with one or more interleaved physical resource blocks of PSSCH.

5. The method according to claim 4, wherein: The CSI-RS is mapped to a symbol before the PSFCH.

6. The method according to claim 1, wherein: The CSI-RS is mapped to the last symbol position of the PSSCH.

7. The method according to claim 1, wherein: The CSI-RS is configured as Sidelink Control Information (SCI).

8. The method according to claim 7, wherein: The CSI-RS is configured in the second stage of SCI.

9. The method according to claim 8, wherein: The CSI-RS is configured to indicate whether the last PSSCH symbol is to be dropped.

10. The method according to claim 7, wherein: The CSI-RS is configured in the first stage of SCI.

11. The method according to claim 10, wherein: The CSI-RS is configured to indicate whether the last symbol of the PSSCH is to be discarded.

12. The method according to claim 1, wherein: If the PSSCH is not triggered, the resource elements associated with the potential CSI-RS resource pool are treated as punctured.

13. The method according to claim 1, further comprising: Before decoding the data in the PSSCH, the CSI-RS in all interlaces are decoded.

14. A user equipment (UE) for wireless communication, comprising: at least one processor, and a memory coupled to the at least one processor, the at least one processor and the memory being configured to: establishing a sidelink communication channel; receiving a time division multiplexed (TDM) channel state information reference signal (CSI-RS) mapped on a plurality of interleaved PSSCH resource blocks, wherein the mapped CSI-RS is interleaved with resource elements in at least a portion of the plurality of interleaved PSSCH resource blocks; processing the CSI-RS received on the plurality of interleaved PSSCH resource blocks; and According to the processing, a channel quality of the sidelink communication channel is determined from the portion of the plurality of interleaved PSSCH resource blocks including the mapped CSI-RS.

15. The UE according to claim 14, wherein: The TDM CSI-RS occupies one resource element in each of one or more resource blocks.

16. The UE according to claim 14, wherein: The TDM CSI-RS occupies two consecutive resource elements in each resource block of one or more resource blocks.

17. The UE according to claim 14, wherein: The PSSCH resource block includes one or more physical sidelink feedback channel (PSFCH) resources associated with one or more interleaved physical resource blocks of PSSCH.

18. The UE according to claim 17, wherein: The CSI-RS is mapped to a symbol before the PSFCH.

19. The UE according to claim 14, wherein: The CSI-RS is mapped to the last symbol position of the PSSCH.

20. The UE according to claim 14, wherein: The CSI-RS is configured as Sidelink Control Information (SCI).

21. The UE according to claim 20, wherein: CSI-RS is configured in the second stage of SCI.

22. The UE according to claim 21, wherein: The CSI-RS is configured to indicate whether the last PSSCH symbol is to be discarded.

23. The UE according to claim 20, wherein: The CSI-RS is configured in the first stage of SCI.

24. The UE according to claim 23, wherein: The CSI-RS is configured to indicate whether the last symbol of the PSSCH is to be discarded.

25. The UE according to claim 14, wherein: If the PSSCH is not triggered, the processor and memory are configured to process resource elements associated with the potential CSI-RS resource pool as being punctured.

26. The UE of claim 14, the processor and memory configured to decode CSI-RS in all interlaces before decoding data in the PSSCH.

27. A non-transitory computer-readable medium storing computer-executable code at a user equipment (UE), comprising code for causing a computer to: establishing a sidelink communication channel; A time division multiplexed (TDM) channel state information reference signal (CSI-RS) mapped on a plurality of interleaved PSSCH resource blocks is received, wherein: The mapped CSI-RS is interleaved with resource elements in at least a portion of the plurality of interleaved PSSCH resource blocks; Processing the CSI-RS received on the plurality of interleaved PSSCH resource blocks; as well as According to the processing, a channel quality of the sidelink communication channel is determined from the portion of the plurality of interleaved PSSCH resource blocks including the mapped CSI-RS.

28. The non-transitory computer readable medium of claim 27, wherein: The TDM CSI-RS occupies one resource element in each of one or more resource blocks.

29. The non-transitory computer readable medium of claim 27, wherein: The TDM CSI-RS occupies two consecutive resource elements in each resource block of one or more resource blocks.

30. The non-transitory computer readable medium of claim 27, wherein: The PSSCH resource block includes one or more physical sidelink feedback channel (PSFCH) resources associated with one or more interleaved physical resource blocks of PSSCH.

31. The non-transitory computer readable medium of claim 30, wherein: The CSI-RS is mapped to a symbol before the PSFCH.

32. The non-transitory computer readable medium of claim 27, wherein: The CSI-RS is mapped to the last symbol position of the PSSCH.

33. The non-transitory computer readable medium of claim 27, wherein: The CSI-RS is configured as Sidelink Control Information (SCI).

34. The non-transitory computer readable medium of claim 33, wherein: The CSI-RS is configured in the second stage of SCI.

35. The non-transitory computer readable medium of claim 34, wherein: The CSI-RS is configured to indicate whether the last PSSCH symbol is to be discarded.

36. The non-transitory computer readable medium of claim 33, wherein: The CSI-RS is configured in the first stage of SCI.

37. The non-transitory computer readable medium of claim 36, wherein: The CSI-RS is configured to indicate whether the last symbol of the PSSCH is to be discarded.

38. The non-transitory computer readable medium of claim 27, wherein: If the PSSCH is not triggered, the resource elements associated with the potential CSI-RS resource pool are treated as punctured.

39. The non-transitory computer readable medium of claim 27, further comprising: Before decoding the data in the PSSCH, the CSI-RS in all interlaces are decoded.

40. A user equipment (UE) for wireless communication, comprising: means for establishing a sidelink communication channel; means for receiving a time division multiplexed (TDM) channel state information reference signal (CSI-RS) mapped on a plurality of interleaved PSSCH resource blocks, wherein the mapped CSI-RS is interleaved with resource elements in at least a portion of the plurality of interleaved PSSCH resource blocks; means for processing the CSI-RS received on the plurality of interleaved PSSCH resource blocks; and Means for determining, based on the processing, a channel quality of the sidelink communication channel from the portion of the plurality of interleaved PSSCH resource blocks that includes the mapped CSI-RS.

41. The UE according to claim 40, wherein: The TDM CSI-RS occupies one resource element in each of one or more resource blocks.

42. The UE according to claim 40, wherein: The TDM CSI-RS occupies two consecutive resource elements in each resource block of one or more resource blocks.

43. The UE according to claim 40, wherein: The PSSCH resource block includes one or more physical sidelink feedback channel (PSFCH) resources associated with one or more interleaved physical resource blocks of PSSCH.

44. The UE according to claim 43, wherein: The CSI-RS is mapped to a symbol before the PSFCH.

45. The UE according to claim 40, wherein: The CSI-RS is mapped to the last symbol position of the PSSCH.

46. ​​The UE according to claim 40, wherein: The CSI-RS is configured as Sidelink Control Information (SCI).

47. The UE according to claim 46, wherein: CSI-RS is configured in the second stage of SCI.

48. The UE according to claim 47, wherein: The CSI-RS is configured to indicate whether the last PSSCH symbol is to be discarded.

49. The UE according to claim 46, wherein: The CSI-RS is configured in the first stage of SCI.

50. The UE according to claim 49, wherein: The CSI-RS is configured to indicate whether the last symbol of the PSSCH is to be discarded.

51. The UE according to claim 40, wherein: If the PSSCH is not triggered, the means for processing treats the resource elements associated with the potential CSI-RS resource pool as being punctured.

52. The UE according to claim 40, wherein: The means for processing decodes CSI-RS in all interlaces before decoding data in the PSSCH.

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