Interleaved sidelink data for communication

Abstract

Aspects of the present disclosure relate to a user equipment (UE) configured to: establish a sidelink channel; and receive a mapped channel state information reference signal (CSI-RS) on a plurality of PSSCH resource blocks. The mapped CSI-RS may be interleaved with resource elements in at least a portion of the plurality of PSSCH resource blocks. The CSI-RS received on the plurality of PSSCH resource blocks is then processed to determine a channel quality of the sidelink channel based on a portion of the plurality of PSSCH resource blocks that includes the mapped CSI-RS.

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 operations 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 iterations of Long Term Evolution (LTE)-V2X and provides advanced capabilities, primarily in the area of ​​low-latency use cases. Enhanced NR systems and new NR sidelinks were introduced for V2X to meet certain requirements, such as the need for a flexible design to support services with low latency and high reliability requirements, as well as support for higher capacity and better coverage.

[0003] As the demand for mobile broadband access and sidelink communications continues to increase, research and development continue to drive wireless communication technology, not only to meet the growing demand for mobile broadband access, but also to improve and enhance mobile communications. Accordingly, the present disclosure relates to processes and techniques for improving 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 such aspects is provided below. This overview is not an exhaustive overview of all expected 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 detailed description provided later.

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

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

[0007] In another example, a non-transitory computer-readable medium storing computer-executable code at a user equipment (UE) is disclosed, including code for causing a computer to perform the following operations: establish communication on a sidelink channel; and receive a mapped channel state information reference signal (CSI-RS) on multiple PSSCH resource blocks, wherein the mapped CSI-RS is interleaved with resource elements in at least a portion of the multiple PSSCH resource blocks. The non-transitory computer-readable medium is also configured to: process the CSI-RS received on the multiple PSSCH blocks; and through the processing, determine the channel quality of the sidelink channel based on the portion of the multiple 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 communication on a sidelink channel; and a unit for receiving a mapped channel state information reference signal (CSI-RS) on a plurality of PSSCH resource blocks, wherein the mapped CSI-RS is interlaced with resource elements in at least a portion of the plurality of PSSCH resource blocks. The UE may also include: a unit for processing the CSI-RS received on the plurality of PSSCH blocks; and a unit for determining, by the processing, a channel quality of the sidelink channel based on the portion of the plurality of PSSCH resource blocks including the mapped CSI-RS.

[0009] After reviewing the following detailed description, these and other aspects of the present disclosure will become more fully understood. After 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 skilled in the art. Although the features of the present disclosure may be discussed below with respect to certain aspects and the accompanying drawings, all aspects of the present disclosure may include one or more features in the advantageous features discussed herein. In other words, although one or more aspects may be discussed as having certain advantageous features, one or more features in such features may also be used according to the various aspects of the present disclosure discussed herein. In a similar manner, although the exemplary aspects may be discussed below as equipment, system or method embodiments, 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 illustration of an example of a radio 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 utilizing 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 a diagram of an 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 and frequency domains;

[0016] Figure 7 is a diagram of the association of resource blocks 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. 9is a diagram of an interleaved waveform for including a channel state information reference signal (CSI-RS) in a PSCCH and PSSCH resource block;

[0019] Fig.10 is a diagram of a PSSCH signal with staggered CSI-RS for a comb-4, one-port configuration;

[0020] Fig.11 is a diagram of a PSSCH signal with staggered CSI-RS for a comb-4, two-port configuration;

[0021] Fig.12 is a diagram of another PSSCH signal with staggered CSI-RS for a comb-2, two-port configuration;

[0022] Fig.13 is a diagram of a PSSCH signal with staggered CSI-RS for a comb-6, one-port configuration;

[0023] Fig.14 is a diagram of a PSSCH signal with staggered CSI-RS for a comb-6, two-port configuration;

[0024] Fig.15 is a diagram of another PSSCH signal with staggered CSI-RS for a comb-6, one-port configuration;

[0025] Fig.16 is a diagram of a PSSCH signal with staggered CSI-RS for a comb-6 two-port configuration with distributed signals;

[0026] Fig.17 is a diagram of a PSSCH signal with staggered CSI-RS for a comb-2, two-port configuration;

[0027] Fig.18 is a diagram of a PSSCH signal with staggered CSI-RS for a Comb-2 two-port configuration with distributed signals;

[0028] Fig.19 is a diagram of a PSSCH signal with densified CSI-RS interleaving for a one-port or two-port configuration;

[0029] Fig. 20 is a diagram of a PSSCH signal with densified CSI-RS interleaving for a one-port configuration;

[0030] Fig.21 is a diagram of a PSSCH signal with densified CSI-RS interleaving for a two-port configuration;

[0031] Fig. 22 is a diagram of another PSSCH signal with densified CSI-RS interleaving for a two-port configuration;

[0032] Fig.23 is a diagram of a multiple interleaved waveform for including CSI-RS in PSCCH and PSSCH resource blocks;

[0033] Fig.24 is another diagram of a multi-staggered waveform for including CSI-RS in PSCCH and PSSCH resource blocks;

[0034] Fig.25 is a block diagram illustrating an example of a hardware implementation for a UE employing a processing system according to some aspects of the present disclosure; and

[0035] Fig.26 is a flow chart for receiving and processing a PSSCH block including interleaved CSI-RS resource elements. DETAILED DESCRIPTION

[0036] The detailed description set forth below in conjunction with the accompanying drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be implemented. In order to provide a thorough understanding of each concept, the detailed description includes specific details. However, it will be apparent to those skilled in the art that these concepts may be implemented without these specific details. In some instances, well-known structures and components are shown in block diagram form in order to avoid blurring such concepts.

[0037] Although various aspects are described in this application by the description of some examples, it will be understood by those skilled in the art that additional implementations and use cases may be generated 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, aspects and / or uses can be generated 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 / purchase equipment, medical devices, AI-enabled devices, etc.). Although some examples may or may not be specifically for use cases or applications, there may be a variety of applicable scopes of the described aspects. Implementations may have a range from chip-level or modular components to non-modular, non-chip-level implementations, and further to aggregated, distributed, or OEM devices or systems incorporating one or more aspects of the present disclosure. In some actual settings, the devices incorporating the described aspects and features may also necessarily include additional components and features for the implementation and implementation of the claimed 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 contemplated that the aspects described herein can be implemented in a variety of devices, chip-level components, systems, distributed arrangements, end-user devices, etc., having different sizes, shapes, and configurations.

[0038] The various concepts presented throughout this disclosure may be implemented in a wide variety of telecommunication systems, network architectures and communication standards. Figure 1 , various aspects of the present disclosure are illustrated with reference to a wireless communication system 100 as a non-limiting illustrative example. 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 implemented to perform data communications with an external data network 110, such as (but not limited to) the Internet.

[0039] The RAN 104 may implement any one or more suitable wireless communication technologies to provide radio access to the UE 106. As one example, the RAN 104 may operate in accordance with the 3rd Generation Partnership Project (3GPP) New Radio (NR) specification (often referred to as 5G). As another example, the RAN 104 may operate in accordance with a hybrid of 5G NR and Evolved Universal Terrestrial Radio Access Network (eUTRAN) standards (often 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 utilized within the scope of the present disclosure.

[0040] As shown, the RAN 104 includes a plurality of base stations 108. In a broad sense, a base station is a network element in a radio access network that is responsible for radio transmission and reception to or from a UE in one or more cells. In different technologies, standards, or contexts, those skilled in the art may refer to a base station as a base transceiver (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, an evolved Node B (eNB), a gNodeB (gNB), or some other appropriate terminology.

[0041] The radio access network 104 is also shown to support wireless communications for multiple mobile devices. In the 3GPP standard, a mobile device may be referred to as a user equipment (UE), but those skilled in the art may also refer to it as a mobile station (MS), a user station, a mobile unit, a user unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile user station, an access terminal (AT), a mobile terminal, a wireless terminal, a remote terminal, a handset, a terminal, a user agent, a mobile client, a client, or some other appropriate term. A UE may be a device that provides a user with access to network services.

[0042] In this document, a "mobile" device does not necessarily need to have the ability to move, it can be stationary. The term mobile device or mobile device broadly refers to a wide variety of devices and technologies. A UE may include multiple hardware structural components, which are sized and shaped to be arranged and arranged 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, smart books, tablet devices, personal digital assistants (PDAs) and a variety of embedded systems, for example, corresponding to the "Internet of Things" (IoT). In addition, a mobile device may be a car or other means of transportation, a remote sensor or actuator, a robot or robotic device, a satellite radio device, a global positioning system (GPS) device, an object tracking device, a drone, a multi-rotor helicopter, a quadcopter, a remote control device, a consumer 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, and the like, and / or a wearable device. In addition, the mobile device may be a digital home or smart home device, such as home audio, video and / or multimedia devices, home appliances, vending machines, smart lighting, home security systems, smart meters, and the like. In addition, the mobile device may be a smart energy device, security equipment, solar panels or solar arrays, municipal infrastructure equipment that controls power (e.g., smart grids), lighting, water, and the like; industrial automation and enterprise equipment; logistics controllers; agricultural equipment; military defense equipment, vehicles, aircraft, ships, and weapons, and the like. In addition, the mobile device may provide connected medicine or telemedicine support (e.g., telehealth care). Telemedicine devices may include telemedicine monitoring devices and telemedicine management devices, whose communications may be given priority or priority access relative to other types of information, for example, in terms of priority access for the transmission of critical service data, and / or in terms of associated QoS for the transmission of critical service data.

[0043] 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 the air interface can be referred to as downlink (DL) transmissions. According to certain aspects of the present disclosure, the term downlink can refer to point-to-multipoint transmissions originating from a scheduling entity (further described below; e.g., base station 108). Another way to describe the scheme can 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 further aspects of the present disclosure, the term uplink can refer to point-to-point transmissions originating from a scheduled entity (further described below; e.g., UE 106).

[0044] In some examples, access to the air interface may be scheduled, wherein a scheduling entity (e.g., a base station 108) allocates resources for communication between some or all devices and apparatuses within its service area or cell. In the present disclosure, as further discussed below, a scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for 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.

[0045] 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 that schedules resources for one or more scheduled entities (e.g., one or more other UEs).

[0046] like Figure 1 , a base station 108 may broadcast downlink traffic 112 to one or more UEs 106. In a broad sense, 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 (e.g., a base station 108).

[0047] Typically, base stations 108 may include a backhaul interface for communicating with a backhaul portion 120 of a wireless communication system. Backhaul 120 may provide a link between base stations 108 and core network 102. Additionally, in some examples, a backhaul network may provide interconnections between respective base stations 108. Various types of backhaul interfaces may be used, such as a direct physical connection, a virtual network, or a backhaul interface using any suitable transport network.

[0048] 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 may be configured according to a 5G standard (e.g., 5GC). In other examples, the core network 102 may be configured according to a 4G Evolved Packet Core (EPC) or any other appropriate standard or configuration.

[0049] Now refer to Figure 2 , by way of example and not limitation, a schematic diagram of a RAN 200 is provided. In some examples, the RAN 200 may be similar to the one described above and in Figure 1 The geographic area covered by the RAN 200 may be divided into a plurality of cellular regions (cells) that a user equipment (UE) may uniquely identify based on an identity broadcast from an access point or base station. Figure 2 Macro cells 202, 204, and 206 and small cells 208 are shown, each of which may include one or more sectors (not shown). A sector is a sub-area of ​​a cell. All sectors in a cell are served by the same base station. A radio link in a sector may be identified by a single logical identifier belonging to the sector. In a cell divided into multiple sectors, multiple sectors in a cell may be formed by multiple groups of antennas, each of which is responsible for communication with a UE in a portion of the cell.

[0050] exist Figure 2In the example shown, two base stations 210 and 212 are shown in cells 202 and 204; and a third base station 214 is shown as being used to control 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 via a feeder cable. In the example shown, cells 202, 204, and 126 may be referred to as macro cells, because base stations 210, 212, and 214 support cells with large sizes. In addition, a base station 218 is shown in a small cell 208 (e.g., a micro cell, a micro cell, a femto cell, a home base station, a home node B, a home evolved node B, etc.), where the small cell 208 may overlap with one or more macro cells. In this example, cell 208 may be referred to as a small cell, because base station 218 supports a cell with a relatively small size. The cell size setting may be performed according to the system design and component constraints.

[0051] 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 in Figure 1 The base station / scheduling entity 108 shown in FIG.

[0052] 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 depending on the location of a mobile base station (such as a quadcopter 220).

[0053] In the RAN 200, a cell 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 services to the core network 102 (see FIG. 1 ) to all UEs in the corresponding cell. Figure 1 ) access point. For example, UEs 222 and 224 may communicate with base station 210; UEs 226 and 228 may communicate with base station 212; UEs 230 and 232 may communicate with base station 214 by way of RRH 216; UE 234 may communicate with base station 218; and UE 236 may communicate with mobile base station 220. In some examples, UEs 222, 224, 226, 228, 230, 232, 234, 236, 238, 240, and / or 242 may 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.

[0054] In some examples, a mobile network node (eg, quadcopter 220 ) can be configured to act as a UE. For example, quadcopter 220 can operate in cell 202 by communicating with base station 210 .

[0055] In the radio access network 200, the ability of a UE to communicate while moving (independent of its location) is called mobility. This is usually done in an access and mobility management function (AMF, not shown, Figure 1 The AMF establishes, maintains and releases various physical channels between the UE and the radio access network under the control of the core network 102 in the core network. The AMF may include a security context management function (SCMF) that manages the security context for both control plane and user plane functions, and a security anchor function (SEAF) that performs authentication.

[0056] In various aspects of the present disclosure, the radio access network 200 can use DL-based mobility or UL-based mobility to implement mobility and switching (i.e., the connection of the UE is switched from one radio channel to another radio channel). In a network configured for DL-based mobility, during a call with a scheduling entity, or at any other time, the UE can 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 can maintain communication with one or more neighboring cells in the neighboring cells. During this time, 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 can perform a handoff or handover from the serving cell to the neighboring (target) cell. For example, a UE 224 (shown as a vehicle, but any suitable form of UE can be used) can 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 a neighbor 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 condition to its serving base station 210. In response, the UE 224 may receive a handover command, and the UE may perform a handover to the cell 206.

[0057] In a network configured for UL-based mobility, the network can use the UL reference signal from each UE 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 time slot timing based on 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) in 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 the base stations 210 and 214 / 216 and / or a central node in the core network) may determine a serving cell for the UE 224. As the UE 224 moves through the radio access network 200, the network may continue to monitor the uplink pilot signals sent by the UE 224. When the signal strength or quality of the pilot signal measured by the neighbor cell exceeds the signal strength or quality measured by the serving cell, the network 200 may handover the UE 224 from the serving cell to the neighbor cell with or without notifying the UE 224.

[0058] Although the synchronization signal transmitted by base stations 210, 212 and 214 / 216 may be uniform, the synchronization signal 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. 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, because the number of mobility messages that need to be exchanged between the UE and the network can be reduced.

[0059] In various implementations, the air interface in the radio access network 200 may use a licensed spectrum, an unlicensed spectrum, or a shared spectrum. Licensed spectrum typically provides exclusive use of a portion of the spectrum with the help of a mobile network operator purchasing a license from a government regulator. Unlicensed spectrum provides shared use of a portion of the spectrum without the need for a government-authorized license. Although it is still generally necessary to comply with some technical rules to access the unlicensed spectrum, in general, any operator or device can obtain access. Shared spectrum can fall between licensed spectrum and unlicensed spectrum, where some technical rules or restrictions may be required to access the spectrum, but the spectrum can still be shared by multiple operators and / or multiple RATs. For example, a license holder of a portion of the licensed spectrum may be provided with licensed shared access (LSA) to share the spectrum with other parties (e.g., with appropriate licensee-determined conditions to obtain access).

[0060] In order to obtain a low block error rate (BLER) for transmissions over the radio access network 200 while still achieving very high data rates, channel coding may be used. That is, wireless communications may typically utilize appropriate error-correcting block codes. In a typical block code, an information message or sequence is split into code blocks (CBs), and then an encoder (e.g., CODEC) at the transmitting device mathematically adds redundancy to the information message. The use of this redundancy in the encoded information message may improve the reliability of the message, thereby enabling correction of any bit errors that may occur due to noise.

[0061] In early 5G NR specifications, quasi-cyclic low-density parity check (LDPC) with two different basemaps is used to encode user data: one basemap is used for large code blocks and / or high code rates, and the other basemap is used for other cases. Polar coding is used to encode control information and physical broadcast channel (PBCH) based on nested sequences. For these channels, puncturing, shortening, and repetition are used for rate matching.

[0062] However, it will be appreciated by those skilled in the art that various aspects of the present disclosure may be implemented using any suitable channel code. Various implementations of the base station (e.g., scheduling entity) 108 and the UE (e.g., scheduled entity) 106 may include appropriate hardware and capabilities (e.g., encoders, decoders, and / or CODECs) to utilize one or more of these channel codes for wireless communication.

[0063] 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 two endpoints can communicate with each other simultaneously. Half-duplex means that at a certain time, only one endpoint can send information to the other endpoint. In a wireless link, a full-duplex channel usually relies on the physical isolation of the transmitter and the receiver and appropriate interference elimination techniques. Full-duplex simulation is often implemented for a wireless link by utilizing frequency division duplex (FDD) or time division duplex (TDD). In FDD, transmissions in different directions operate at 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 certain times, a channel is dedicated to transmissions in one direction, and at other times, the channel is dedicated to transmissions in another direction, wherein the direction can change very quickly (e.g., several times per time slot).

[0064] 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 utilizes orthogonal frequency division multiplexing (OFDM) with a cyclic prefix (CP) to provide multiple access for UL transmissions from UEs 222 and 224 to the base station 210 and multiplexing for DL ​​transmissions from the base station 210 to one or more UEs 222 and 224. 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 appropriate multiple access schemes. In addition, multiplexing of DL transmissions from base station 210 to UEs 222 and 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.

[0065] 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 communication between some or all devices and apparatuses within its service area or cell. In the present disclosure, as further discussed below, a scheduling entity may be responsible for scheduling, assigning, reconfiguring, and releasing resources for one or more scheduled entities. That is, for scheduled communications, a UE or a scheduled entity may use resources allocated by the scheduling entity.

[0066] The base station is not the only entity that can act as a scheduling entity. That is, in some examples, the UE can act as a scheduling entity that schedules 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 acting as a scheduling entity, and UEs 240 and 242 can act as scheduled entities. In other examples, a sidelink or other type of direct link signal can be transmitted directly between UEs without having to rely on scheduling or control information from another entity. For example, UEs 238, 240, and 242 can communicate on a direct link in a device-to-device (D2D), peer-to-peer (P2P), vehicle-to-everything (V2X) network, and / or in a mesh network. In the mesh network example, UEs 240 and 242 can optionally communicate directly with each other in addition to communicating with a scheduling entity (e.g., UE 238).

[0067] In some examples, UE 238 may be a transmitting sidelink device that reserves resources on a sidelink carrier for transmitting sidelink signals in a D2D or V2X network to UEs 240 and 242. Here, UEs 240 and 242 are each receiving sidelink devices. UEs 240 and 242 may further reserve additional resources on the sidelink carrier for subsequent sidelink transmissions.

[0068] 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 relying on communication through the base station. In this example, base station 227 or one or both of UEs 226 and 228 can act as a scheduling entity to schedule sidelink communications between UEs 226 and 228. For example, UEs 126 and 128 can transmit sidelink signals 227 in a vehicle-to-everything (V2X) network.

[0069] The two main technologies that may be used by V2X networks 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 particular V2X standard or may be directed to sidelink networks other than V2X networks.

[0070] 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.

[0071] The use of such multi-antenna technology enables wireless communication systems to exploit the spatial domain to support spatial multiplexing, beamforming, and transmit diversity. Spatial multiplexing can be used to send different data streams (also referred to as layers) simultaneously on the same time-frequency resources. Data streams 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 streams arrive at the UE with different spatial characteristics, which enables each UE in the multiple 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.

[0072] The number of data streams or layers corresponds to the rank of the transmission. Typically, the rank of the MIMO system 300 is limited by the number of transmit antennas 304 or receive antennas 308, whichever is lower. In addition, the channel conditions at the UE and other considerations such as the available resources at the base station may also affect the transmission rank. For example, the rank (and therefore the number of data streams) assigned to a particular UE on the downlink 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 (e.g., the number of transmit antennas and receive antennas) and the signal to interference and noise ratio (SINR) measured on each of the receive antennas. For example, the RI can indicate the number of layers that can be supported under the current channel conditions. The base station can use the RI and resource information (e.g., the available resources and amount of data to be scheduled for the UE) to assign the transmission rank to the UE.

[0073] In a time division duplex (TDD) system, UL and DL are reciprocal because each uses a different time slot 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 measurements (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. Based on 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.

[0074] In the simplest case, Figure 3 As shown in , a rank 2 spatial multiplexing transmission on a 2x2 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 reconstruct the data stream using the received signal from each receive antenna 308.

[0075] Will refer to Figure 4 Various aspects of the present disclosure are described with reference to the OFDM waveform schematically shown 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 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.

[0076] 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. Figure 4 , shows an expanded view of an exemplary DL subframe 402 showing an OFDM resource grid 404. However, as will be readily apparent to those skilled in the art, the PHY transmission structure for any particular application may differ from the examples described herein, depending on any number of factors. Here, time is in the horizontal direction, in units of OFDM symbols, and frequency is in the vertical direction, in units of subcarriers or tones.

[0077] Resource grid 404 can be used to schematically represent the time-frequency resources for a given antenna port. That is, in a MIMO implementation with multiple available antenna ports, a corresponding number of resource grids 404 may be available for communication. Resource grid 404 is divided into multiple resource elements (REs) 406. RE (which is 1 carrier × 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 bits of information. In some examples, a block of REs may be referred to as a physical resource block (PRB) or more simply as a resource block (RB) 408, which contains any appropriate number of consecutive subcarriers in the frequency domain (also referred to as interleaving in this article). In one example, an RB may include 12 subcarriers, regardless of the number of digital schemes used. In some examples, depending on the digital scheme, an RB may include any appropriate 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 (for a given device, a transmission or reception direction).

[0078] A UE typically utilizes only a subset of the resource grid 404. An RB may be the smallest unit of resources that may be allocated to a UE. Thus, the more RBs scheduled for a UE and the higher the modulation scheme selected for the air interface, the higher the data rate for the UE.

[0079] 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 implementation, subframe 402 may have a bandwidth corresponding to any number of one or more RBs 408. Furthermore, in this illustration, while RB 408 is shown as occupying less than the entire duration of subframe 402, this is merely one possible example.

[0080] Each 1 ms subframe 402 may consist of one or more adjacent time slots. Figure 4 In the example shown in , a subframe 402 includes four time slots 410 as an illustrative example. In some examples, the 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 shorter durations (e.g., one or two OFDM symbols). In some cases, these micro-time slots may be sent by occupying resources scheduled for ongoing time slot transmissions for the same or different UEs.

[0081] An expanded view of one of the time slots 410 shows that the time slot 410 includes 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 time slot structures may be utilized and may include one or more regions in each of the control region and the data region.

[0082] 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. The scalable digital scheme refers to the ability of the network to select different subcarrier spacings and therefore use each spacing to select the corresponding symbol duration (including CP length). Using a scalable digital scheme, the nominal subcarrier spacing (SCS) can be scaled 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 symbols of certain common multiples (for example, aligned at the boundaries of each 1ms subframe). The range of SCS can include any appropriate SCS. For example, a scalable digital scheme can support SCS ranging from 15kHz to 480kHz.

[0083] Although not in Figure 4 4, but each RE 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 be provided for receiving devices to perform channel estimation for corresponding channels, which may enable coherent demodulation / detection of control and / or data channels within RB 408.

[0084] 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 transmissions 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 transmissions from one device to a single other device.

[0085] 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, the DL control information 114 including one or more DL control channels that typically carry information originating from higher layers, such as 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.

[0086] The synchronization signals PSS and SSS (collectively referred to as SS) (and in some examples, PBCH) may be sent in an SS block that includes 4 consecutive OFDM symbols numbered via time indices in increasing order from 0 to 3. In the frequency domain, the SS block may extend to 240 consecutive subcarriers, where the subcarriers are 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 utilize 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 discontinuous symbols for the SS block.

[0087] 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 assignments of REs for DL ​​and UL transmissions.

[0088] 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, such as a physical uplink control channel (PUCCH), a 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 a demodulation reference signal (DM-RS), a phase tracking reference signal (PT-RS), a sounding reference signal (SR), 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 technology well known to those skilled in the art, wherein the integrity of the packet transmission may be checked at the receiving side for accuracy, for example, using any appropriate integrity check mechanism, such as a checksum or a cyclic redundancy check (CRC). If the integrity of the transmission is confirmed, an ACK may be sent, and if the integrity of the transmission is not confirmed, a NACK may be sent. In response to the NACK, the transmitting device may send a HARQ retransmission, which may implement append combining, incremental redundancy, etc.

[0089] In addition to control information, one or more REs 406 (e.g., within the data region 414) may be allocated for user data or traffic data. 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).

[0090] 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 and 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).

[0091] The OSI may include any SI not broadcast in the MSI. In some examples, the PDSCH may carry multiple SIBs discussed above, not limited to SIB1. Here, the OSI may be provided in these SIBs (eg, SIB2 and above).

[0092] In an example of sidelink communication on a sidelink carrier via a proximity service (ProSe) PC5 interface, a control region 312 of a 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 device or other sidelink device) toward a set of one or more other receiving sidelink devices. A data region 314 of the time slot 310 may include a physical sidelink shared channel (PSSCH) including data sent by an initiating (transmitting) sidelink device within resources reserved by the transmitting sidelink device on the sidelink carrier.

[0093] Described above and in Figure 1 and 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 may be utilized in addition to the channels or carriers shown, such as other traffic, control, and feedback channels.

[0094] These physical channels described above are typically multiplexed and mapped to transport channels for processing at the medium access control (MAC) layer. Transport channels carry blocks of information called transport blocks (TBs). The transport block size (TBS), which may correspond to the number of bits of information, may be a controlled parameter based on the modulation and coding scheme (MCS) and the number of RBs in a given transmission.

[0095] Figure 5500 is a diagram of a physical sidelink broadcast channel (PSBCH) synchronization signal block (SSB) configured for NR sidelink communication and occupying a time slot 502 including a plurality of symbols 504. For NR sidelink communication, a sidelink bandwidth part (BWP) may be configured on a carrier, wherein 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. With respect to the physical channels and reference signals of the NR sidelink, a sidelink transmitting UE may transmit a PSSCH, which conveys 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 and low-density parity check (LDPC) codes may be utilized, and 256QAM may also be applied, depending on UE capabilities. The PSFCH may be transmitted by a sidelink receiving UE for unicast and groupcast, and may transmit 1-bit information for HARQ acknowledgement (ACK) and negative ACK (NACK) on 1 RB. In some demonstrative embodiments, channel state information (CSI) may be carried in a medium access control (MAC) control element (CE) on the PSSCH (instead of the PSFCH).

[0096] When the traffic to be sent to the receiving UE arrives at the sending UE, the sending UE may first send a PSCCH, which transmits data including a portion of the sidelink control information (SCI) to be decoded by any UE for channel sensing purposes, including reserved time-frequency resources for transmission, demodulation reference signal (DMRS) mode and antenna port, etc. For PSCCH, the SCI may be sent using a polarization code using quadrature phase shift keying (QPSK). 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 the indication for its resource allocation in the first stage SCI.

[0097] Similar to downlink transmission in NR, in sidelink transmission, primary synchronization signal and secondary synchronization signal (SPSS and SSSS, respectively) are supported, where M sequence and Gold sequence 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 for forming 672 SSIDs. Therefore, by detecting SPSS / SSSS, the UE is able to know the characteristics of the UE used to send SPSS / SSSS. During the initial cell search, a series of processes for acquiring timing and frequency synchronization and the SSID of the UE may be performed. In some examples, the UE sending SPSS / SSSS may not necessarily participate in the sidelink transmission, and the node sending SPSS / SSSS (e.g., UE / eNB / gNB) may operate as a synchronization source.

[0098] Figure 5 The example of shows a time slot, which includes 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 gap symbols 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 shows the structure of SSB for a 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 conveys information related to synchronization, such as a direct frame number (DFN), an indication of time resources at the time slot and symbol level for sidelink transmission, an in-coverage indicator, etc. SSB can be transmitted periodically (e.g., every 160ms). In addition, there can be N repetitions within a 160ms period with a configurable starting offset and interval. N may be configured according to the SCS.A physical reference signal, such as a channel state information reference signal (CSI-RS), may also be used for sidelink transmissions.

[0099] Figure 6is a diagram of an 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 shows data occupying a time slot 602 in a plurality of time slots (shown as dashed lines) in the time domain for a subchannel 604 in a plurality of subchannels in the frequency domain. For NR sidelink transmissions, multiplexing of PSCCH 608, PSSCH 612, and associated PSFCH 622 is shown in the figure, where PSCCH 608 and PSSCH 612 may 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.

[0100] In this example, an automatic gain control (AGC) symbol 606 can be used to help adjust the signal strength at the input of the ADC so that the signal SNR required for correct decoding is met. The PSCCH symbol 608 can occupy several consecutive RBs in the starting subchannel of the PSSCH transmission (for example, on 2 or 3 symbols at the beginning of the time slot), while the PSSCH 612, 616 can span multiple subchannels with associated DMRS symbols 610, 614, 618. In some examples, the last two symbols 622 (excluding gaps (or guard periods (GP)) 620, 624) can accommodate PSFCH at every, every two, or every four time slots. Given a certain time-frequency position of the PSSCH, the candidate resources corresponding to the PSFCH should first be identified in order to identify the "actual" time-frequency position (resource) corresponding to the PSFCH.

[0101] Figure 7700 is an illustration of the association (mapping) of resource blocks in subchannels of a physical sidelink shared channel (PSSCH) and a 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. The subchannels (702-708, 710-716) are configured in their respective frequency bands, as shown along the frequency axis in the figure. In this simplified example, the HARQ resources in PSFCH 720 include HARQ resources 722 for ACK and HARQ resources 724 for NACK, wherein the RBs for each subchannel (702-708, 710-716) in PSSCH are associated in PSFCH 720, as shown in the figure. For time slot n, it can be seen that subchannel 1 702 is associated with block “1” in each of the HARQ resources for ACK 722 and the HARQ resources for NACK 724. Similarly, subchannel 2 704 is associated with block “2” in each of the HARQ resources for ACK 722 and the HARQ resources for 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.

[0102] For PSSCH transmission, the candidate resources for the corresponding PSFCH (720) can be configured as a set of RBs associated with the starting subchannel and time slot for the PSSCH (718). Within the set of RBs configured for actual PSFCH transmission, the first x RBs are associated with the first subchannel in the first time slot associated with the PSFCH time slot, the next x 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 for RBs in the resource (comb) pool. For each PSFCH, the resources for ACK and NACK can be separate.

[0103] Figure 8800 is a block diagram showing sidelink baseband processing under an illustrative example. In block 802, an input is generated or received, which may include relevant communication data, including but not limited to: sidelink (SL) master information block (MIB-SL), discovery transport block, SCI format 0 / 1, and communication transport block. From here, the input is subject to sidelink baseband processing 816, which is generally designated as a dashed box in the figure. In some examples, the transport channel and layer 1 (L1) signaling processing block 804 assists in timing synchronization and system information acquisition, sidelink discovery and sidelink communication, and handles the processing of the broadcast transport channel (SL-BCH), the sidelink discovery transport channel (SL-DCH), and the sidelink communication transport channel (SL-DCH).

[0104] 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, and the physical channel processing block 806 handles 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 (which includes SL-DMRS, PSSS and SSSS signal processing, etc.) is handled by the physical signal generation and modulation block 808. Before processing the signal for RF processing in block 812 and the subsequent transmission in block 812, 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).

[0105] Typically, timing synchronization and system information acquisition are facilitated through a broadcast transport channel (SL-BCH) and its physical counterpart PSBCH. These channels can be considered similar to the BCH / PBCH broadcast channels used for cell and system acquisition support in LTE DL. The channel can be used to broadcast a set of preambles and basic system information within a certain area. The set of primary and secondary preambles (PSSS and SSSS) is used for synchronization purposes. The SL master information block (MIB-SL) carries sidelink system information. Sidelink discovery can be facilitated by a transport channel (SL-DCH) and its physical counterpart PSDCH. The SL-DCH can follow the downlink shared channel structure. In some examples, since the notification message sent by the UE is a PHY transport block formed with zero MAC overhead, there is no high-level specification in the discovery mode. Filling the TB payload can be open and can depend on the application, such as close range services (ProSe). Sidelink communications can be facilitated using a transport channel (SL-SCH) and its physical counterpart PSSCH. In order for the receiving UE to successfully decode the physical communication channel, information about the specific resources assigned for transmission and the transmission configuration is required, and this information is carried in the sidelink control channel (SCI), which is similar to the downlink DCI concept. SCI can be carried in the PSCCH channel and can be configured according to SCI format 0 and / or SCI format 1. Physical channel estimation is achieved through 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 per subframe for PSBCH, PSDCH, PSCCH and PSSCH. In a further example, three DMRS symbols can be used for PSBCH, and four symbols can be used for PSCCH and PSSCH.

[0106] With respect to sidelink communications (such as 3GPP Release 16 NR V2X), channel state information (CSI-RS) is configured as non-periodic and is 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), staggered waveforms are defined to meet occupied channel bandwidth (OCB) requirements in unlicensed bands. However, when the PSSCH is configured as a staggered waveform, specific challenges regarding the transmission of the CSI-RS may arise because, for example, in legacy systems (i.e., before 3GPP Release 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. Staggered CSI-RS waveforms have been difficult to incorporate into the PSCCH because they would add additional complexity to channel estimation. The CSI-RS in the sidelink is configured as a comb signal that occupies 1 or 2 consecutive REs per RB for 1 or 2 channel ports, respectively. Thus, for example, if one port is used, the CSI-RS occupies one RE per RB, while if two ports are used, the CSI-RS will occupy two adjacent REs per RB. For example, for 1-port CSI-RS, a comb resource mapping without CDM in the frequency domain can be used, where for a density of 1 or 0.5RE / PRB, comb-12 can be used within a PRB, while for a density of 0.5RE / PRB, every other PRB can be mapped.

[0107] If 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"), the UE may send sidelink CSI-RS within the PSSCH transmission. Parameters for CSI-RS transmission may be configured via higher-level parameters, for example, to indicate the number of ports for SL CSI-RS, the first OFDM symbol in a PRB for SL CSI-RS, and / or the frequency domain allocation for SL CSI-RS.

[0108] Fig. 9 9 is a diagram of an interlaced waveform 900 for including a channel state information reference signal (CSI-RS) in PSCCH and PSSCH resource blocks. When transmitting CSI-RS, it is advantageous to transmit the signal in the same resource pool as PSSCH because this improves interference management by capturing interference in the same interlace of PSSCH and thus reflects a "true" channel quality indicator (CQI) for interference. This can be achieved by using Fig. 9The configuration is implemented in which, in this example, using the illustrative CSI-RS bandwidth shown in the figure, the CSI-RS (922-932) is interleaved into PSCCH 902 and PSSCH 902-912. The CSI-RS can be mapped to RBs within the interleaved pool resources in which the PSCCH and PSSCH are transmitted. In some examples, the CSI-RS is triggered by SCI 0-2 and is transmitted together with the PSSCH. In a configuration in which the PSCCH is transmitted in the interleaved edge RBs (e.g., 902, 920), the CSI-RS can be mapped in RBs similar to those in the PSSCH.

[0109] In some examples, the CSI-RS may be mapped to a partial interlace, where the RRC may configure the starting resource block, the CSI-RS bandwidth, and the number of consecutive resource blocks that the CSI-RS will occupy in the interlace (e.g., six: 922-932). By configuring the CSI-RS to occupy only a portion of the interlace, the CSI-RS overhead may be reduced and may further help avoid PSSCH resource block clusters from appearing at both edges of the interlace. In some examples, the CSI-RS may be configured to occupy half of the interlace. To further reduce the CSI-RS density, the CSI-RS may be mapped to a downsampled subset of resource blocks from the interlace (e.g., every other resource block in each resource block cluster). In the sidelink CSI-RS, resources may be configured for one or two ports per resource block, for one or two resource elements. In one example, for an interlaced CSI-RS waveform, two CSI-RS resource elements may be spaced 1.8 MHz apart. However, in such a configuration, there may not be enough CSI-RS resource elements to have a good channel estimate for each resource block cluster.

[0110] Fig.10 1000 is a diagram of a PSSCH signal 1002 with staggered CSI-RS 1004 for a comb-4, one-port configuration. In this example, the figure shows a 12-comb structure, where the CSI-RS (1004) and copies of the CSI-RS occupy each shaded comb in the figure. In various examples, depending on the application, different configurations using the following items can be used: comb-6 (e.g., occupying 2 CSI-RS of every 6 combs), comb-4 (e.g., occupying 3 CSI-RS of every 4 combs), comb-3 (e.g., occupying 4 CSI-RS of every 3 combs), and comb-2 (e.g., occupying 6 CSI-RS of every 2 combs). Such a configuration can advantageously provide better CQI for each resource block cluster. Fig.10 The example of FIG. 4 shows an example of a comb-4 configuration for one port, where three CSI-RSs occupy every 4 combs in the PSSCH.

[0111] Fig.11 is a diagram 1100 of a PSSCH signal 1102 with staggered CSI-RS (1104) for a comb-4 two-port configuration. The PSSCH signal 1102 is similar to Fig.10 The PSSCH signal 1002 in the comb-4 configuration is shown in FIG. 1 , except that the CSI-RS is configured as two adjacent CSI-RS 1104, 1106 per comb. In some examples, the two ports (P0, P1) are code-division multiplexed (+, -) in frequency to generate two adjacent CSI-RS in a comb-4 configuration.

[0112] Fig.12 is a diagram 1200 of another PSSCH signal 1202 with staggered CSI-RS for a comb-2 two-port configuration. The PSSCH signal 1202 is similar to Fig.11 The signal 1102 is a signal of the embodiment of the present invention, except that here the CSI-RS 1204 is configured in a comb-2 arrangement, which occupies 6 alternating combs in a 12-comb structure for two ports P0, P1. In one example, to achieve this arrangement, an orthogonal cover code (OCC) is applied on the CSI-RS resource elements in the frequency domain to distinguish the two ports, and then the two ports are also CDMed (+-) in the frequency domain.

[0113] In some examples, the CSI-RS density can be increased in an interleaved waveform by utilizing both the time and frequency domains. Here, OCC is applied on the CSI-RS resource elements in the frequency domain to distinguish the two ports, and then the two ports are also CDMed in the frequency domain as described above. The process can then be repeated in adjacent or distributed symbols (resource elements) in each resource block cluster. Distributed CSI-RS symbols can be beneficial for capturing short burst interference, while adjacent symbols can be beneficial in high mobility scenarios to obtain improved CQI estimates for each RB cluster.

[0114] Fig.13 1300 is a diagram of a PSSCH signal 1302 with interleaved CSI-RS 1304, 1306 for a comb-6 one-port configuration. In this example, CSI-RS 1304 is provided in one symbol for every 6 combs (as shown in the shaded symbols) and then replicated in adjacent symbols in the frequency domain (CSI-RS 1306). Fig.14 is a diagram 1400 of a PSSCH signal 1402 with staggered CSI-RS for a comb-6 two-port configuration. The PSSCH signal 1402 is similar to Figure 3The PSSCH information 1302 is the same as that of the PSSCH 1302, except that two ports are utilized. In order to distinguish between the two antennas used for a port, OCC is applied in the time domain, as shown for ports P0 and P1.

[0115] Fig.15 is a diagram 1500 of another PSSCH signal 1502 with staggered CSI-RS for a comb-6 two-port configuration. The PSSCH signal 1502 is similar to Fig.11 1502, where the CSI-RS is configured as one comb-6 CSI-RS symbol set 1504, where another comb-6 CSI-RS symbol set 1506 is contiguous with the first set. The CSI-RS symbols may then be copied / repeated to adjacent combs to have a similar structure where one comb-6 symbol set 1508 and another comb-6 symbol set 1510 are contiguous with each other. In order to distinguish between the two antennas for a port, OCC is applied in the frequency domain, as shown for ports P0 and P1.

[0116] Fig.16 1600 is a diagram of a PSSCH signal 1602 with staggered CSI-RS for a comb-6 two-port configuration with distributed symbols. The PSSCH signal 1602 may be similar to Fig.15 A PSSCH symbol 1502 is shown, wherein the CSI-RS is configured as one comb-6 CSI-RS symbol set 1604, wherein another comb-6 CSI-RS symbol set 1506 is contiguous with the first set. The CSI-RS symbols may then be copied / repeated to another distributed non-adjacent comb to have a similar structure, wherein one comb-6 symbol set 1608 and another comb-6 symbol set 1610 are contiguous with each other. As previously described, in order to distinguish between the two antennas for a port, OCC is applied in the frequency domain, as shown for ports P0 and P1.

[0117] Fig.17 1700 is a diagram of a PSSCH signal 1702 with staggered CSI-RS for a comb-2 two-port configuration. Here, the PSSCH signal 1702 may be similar to Fig.12 1202 in which the CSI-RS 1704 is arranged in a comb structure in a comb-2 configuration. However, in order to densify the CSI-RS signal, another CSI-RS 1710 may be replicated / repeated in an adjacent comb, as shown in the figure. Fig.1818 is a diagram 1800 of a PSSCH signal 1802 with interleaved CSI-RS for a comb-2 two-port configuration with distributed symbols. Here, the PSSCH signal 1802 has CSI-RS symbols 1804 distributed in a comb-s configuration and CSI-RS symbols 1806 distributed in another comb, similar to Fig.17 1702, except that the combs are distributed within the PSSCH signal 1802 (as shown in the figure) instead of configuring the combs to be adjacent. For the two-port case, in some examples, CDM can be applied in the time domain using OCC / CDM, but only for adjacent CSI-RS symbol arrangements (e.g., Fig.17 ). Usually it can be targeted at adjacent (for example, Fig.17 ) and distributed (e.g. Fig.18 ) configure both to apply OCC / CDM in the frequency domain.

[0118] For each of the various embodiments described herein, the CSI-RS may be designed to occupy a configurable number of resource elements and symbols, and they may be continuous. In some examples, the starting position and number of resource elements of the CSI-RS may be configured via RRC. Similarly, the symbol position of the CSI-RS may be configured by RRC. However, in some cases (such as high mobility UEs), it may be necessary to specifically arrange continuous symbols to solve such situations. In some examples, the CSI-RS may be configured to expand over time to capture short burst interference. In extreme cases, the CSI-RS may be configured to occupy all 12 combs (resource elements) per resource block. As discussed above, OCC may be applied in a two-port configuration in the time domain or frequency domain to distinguish between the two ports. In some examples, if the CSI-RS symbols are continuous, OCC is applied only in the time domain.

[0119] Fig.19 1900 is a diagram of a PSSCH signal 1902 with densified CSI-RS interleaving for a one-port or two-port configuration. As discussed above, CSI-RS symbols 1904 are arranged in a continuous manner for one comb, and CSI-RS symbols 1906 are arranged in a continuous manner for another non-adjacent distributed comb. In this example, OCC is applied in the frequency domain.

[0120] Fig. 20 is a diagram 2000 of a PSSCH signal 2002 with densified CSI-RS interleaving for a one-port configuration. As discussed above, CSI-RS symbols 2004 are arranged in a consecutive manner for one comb, and CSI-RS symbols 2006 are arranged in a consecutive manner for another adjacent comb. Fig.2121 is a diagram of a PSSCH signal 2102 with densified CSI-RS interleaving for a two-port configuration. Fig. 20 In the example of , CSI-RS symbols 2104 are arranged in a continuous manner for one comb, and CSI-RS symbols 2106 are arranged in a continuous manner for the other comb. However, the two combs of PSSCH 2102 are configured to be adjacent, rather than distributed as in 2002. As mentioned above, in order to distinguish between the two antennas for a port, OCC is applied in the frequency domain, as shown for ports P0 and P1. Fig. 22 is a diagram 2202 of another PSSCH signal with densified CSI-RS interleaving 2204, 2206 for a two-port configuration. In this example, CSI-RS 2204 and 2206 are interleaved with Fig.21 The CSI-RS 2104 and 2106 are configured similarly, except that OCC is applied in the time domain, as shown for ports P0 and P1.

[0121] In some examples, the CSI-RS sequence can be based on a pseudo-random sequence using a scrambling ID and a slot index. In some examples, a Chu sequence (or "Zadoff-Chu (ZC) sequence") is used for uplink DMRS and SRS to reduce the peak-to-average power ratio (PAPR), which can be beneficial to UE implementation. Using the Chu sequence for the CSI-RS sequence, a long sequence can be formed across the RB cluster used for the entire interleaving.

[0122] Fig.23 2300 is a diagram of a multi-interleaved waveform 2300 for including CSI-RS in PSCCH and PSSCH resource blocks. The figure shows that PSCCH signals 2302 and 2338 are configured at the edges of multiple PSSCH blocks 2304-2336, where, for example, two adjacent RBs 2302, 2304 can be considered as RB clusters 2380. For multi-interleaved allocations, CSI-RS mapping can be configured so that the CSI-RS occupies all interleaved resource blocks within the signaled bandwidth (2340-2370), as shown in the figure. However, in this configuration, this may result in large overhead.

[0123] Fig.242400 is another example of a multi-staggered waveform 2400 for including CSI-RS in PSCCH and PSSCH resource blocks. The figure shows that PSCCH signals 2402 and 2438 are configured at the edges of multiple PSSCH blocks 2404-2336, where, for example, two adjacent RBs 2402, 2404 can be considered as RB clusters 2480. For multi-staggered allocation, the CSI-RS mapping in this example can be configured so that the CSI-RS occupies the first resource block (2442-2470) in each RB cluster. In some examples, the CSI-RS can be configured to occupy every other resource block in each RB cluster. When continuous staggering is used, high frequency correlation with adjacent resource blocks within each RB cluster can be achieved. In some examples, the CSI-RS can be filled with a lower density to reduce overhead.

[0124] Fig.25 25 is a block diagram illustrating an example of a hardware implementation for a UE 2500 employing a processing system 2514. For example, the UE 2500 may be as in Figure 1 and / or any one or more of the user equipment (UE) shown in Figure 2.

[0125] UE 2500 may be implemented using a processing system 2514 (or "processing device") including one or more processors 2504. Examples of processor 2504 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 2500 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, the processor 2504 as utilized in UE 2500 may be used to implement any one or more of the processes or procedures described herein.

[0126] In this example, the processing system 2514 can be implemented using a bus architecture, which is generally represented by bus 2502. Depending on the specific application and overall design constraints of the processing system 2514, the bus 2502 may include any number of interconnecting buses and bridges. The bus 2502 communicatively couples various circuits including one or more processors (which are generally represented by processor 2504), memory 2505, and computer-readable media (which are generally represented by computer-readable media 2506). The bus 2502 may also link various other circuits such as timing sources, peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described. The bus interface 2508 provides an interface between the bus 2502 and the transceiver 2510. The transceiver 2510 provides a communication interface or unit for communicating with various other devices over a transmission medium. Depending on the nature of the device, a user interface 2512 (e.g., a keypad, a display, a speaker, a microphone, a joystick) may also be provided. Of course, such a user interface 2512 is optional and may be omitted in some examples (such as a base station).

[0127] In some aspects of the present disclosure, processor 2504 may include sidelink processing circuitry 2516 configured to implement, for example, the communications and sidelink processing described herein, such as in the above Figure 4-8 For example, the interleaving circuit 2518 may be configured to implement signal interleaving (such as the signal interleaving described herein) and the above Figure 9-24 The densification circuit 2520 may be configured, for example, to implement signal (CSI-RS) densification (such as the densification described herein) and the above Figure 10-24 25. In some examples, circuits 2516-2520 may be combined into one or more circuits. Processor 2504 is responsible for managing bus 2502 and general processing, including executing software stored on computer-readable medium 2506. The software, when executed by processor 2504, causes processing system 2514 to perform various functions described below for any particular device. Computer-readable medium 2506 and memory 2505 may also be used to store data manipulated by processor 2504 when executing software.

[0128] One or more processors 2504 in the processing system 2514 may execute software. Whether referred to as software, firmware, middleware, microcode, hardware description language, or other terms, 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, threads of execution, procedures, functions, etc. The software may reside on a computer-readable medium 2506. The computer-readable medium 2506 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 disks (CDs) or digital versatile disks (DVDs)), smart cards, flash memory devices (e.g., card, stick, 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 2506 may be located in the processing system 2514, located outside the processing system 2514, or distributed among multiple entities including the processing system 2514. The computer readable medium 2506 may be embodied in a computer program product. By way of example, a computer program product may include a computer readable medium having packaging material. Those skilled in the art will recognize how to best implement the functions presented throughout this disclosure based on the specific application and the overall design constraints imposed on the entire system.

[0129] In one or more examples, the computer-readable storage medium 2506 may include sidelink instructions 2522 configured for various functions, including but not limited to sidelink processing associated with the functionality of the sidelink processor 2516. The computer-readable storage medium 2506 may also include interleaving instructions 2524 configured for various functions, including but not limited to time resource allocation associated with the functionality of the interleaving circuit 2518. The computer-readable storage medium 2506 may also include densification instructions 2526 configured for various functions, including but not limited to densification functions associated with the densification circuit 2520.

[0130] Of course, in the above example, the circuits included in the processor 2504 are provided only as examples, and in various aspects of the present disclosure, other units for performing the described functions may be included, including but not limited to instructions stored in the computer-readable storage medium 2506, or in Figure 1-3 Any other suitable apparatus or unit described in any of the Figures and utilizing, for example, the processes and / or algorithms described herein.

[0131] Fig.26 2600 is a flow chart for receiving and processing a PSSCH block including staggered CSI-RS resource elements. In this example, in block 2602, a UE (e.g., 2500) may establish (e.g., via 2510) communication on a sidelink channel. In block 2604, the UE may receive mapped channel state information reference signals (CSI-RS) on multiple PSSCH resource blocks, wherein the mapped CSI-RS are staggered with resource elements in at least a portion of the multiple PSSCH resource blocks. In block 2606, the UE may process the CSI-RS received on the multiple PSSCH blocks, and in block 2608, determine, by processing, a channel quality of the sidelink channel based on the portion of the multiple PSSCH resource blocks that includes the mapped CSI-RS.

[0132] 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.

[0133] For example, various aspects may be implemented in 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 Communications (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 in systems using IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Ultra Wideband (UWB), Bluetooth, and / or other appropriate 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.

[0134] In the present disclosure, the word "exemplary" is used to mean "serving as an example, instance or illustration". Any implementation or aspect described herein as "exemplary" is not necessarily to be construed as preferred or having advantages over other aspects of the present disclosure. Likewise, the term "aspect" does not require that all aspects of the present disclosure include the discussed features, advantages or modes of operation. The term "coupling" is used herein to refer to a direct coupling or an indirect coupling between two objects. For example, if object A physically contacts object B, and object B contacts object C, objects A and C may still be considered to be coupled to each other, even if they are not in direct physical 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 "electronic circuit" are used in a broad sense, and they are intended to include hardware implementations of electronic devices and conductors (implementing the execution of the functions described in the present disclosure when the electronic devices and conductors are connected and configured, without limitation on the type of electronic circuit) and software implementations of information and instructions (implementing the execution of the functions described in the present disclosure when the information and instructions are executed by a processor).

[0135] Can Figure 1-26 One or more of the components, steps, features and / or functions shown in the 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 1-26 The devices, apparatuses 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 efficiently implemented using software and / or embedded in hardware.

[0136] It should be understood that the specific order or hierarchy of steps in the disclosed methods is an illustration of exemplary processes. It should be understood that the specific order or hierarchy of steps in these methods may be rearranged based on design preferences. The attached method claims present elements of the various steps in an order as an example, but are not intended to be limited to the specific order or hierarchy presented unless expressly stated herein.

[0137] 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 will be apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects. Therefore, the claims are not intended to be limited to the various aspects shown herein, but are given the full scope consistent with the text of the claims, wherein, unless explicitly stated otherwise, reference to an element in the singular form is not intended to mean "one and only one", but to refer to "one or more". Unless otherwise explicitly 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 those 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 structural and functional equivalents of the elements of the various aspects described throughout the present disclosure are expressly incorporated herein by reference, and are intended to be included by the claims, and these structural and functional equivalents are known or will be known later to those of ordinary skill in the art. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims.

Claims

1. A method for wireless communication at a user equipment (UE), comprising: establishing communications on a sidelink channel, including receiving at least one physical sidelink shared channel (PSSCH) configured as a staggered waveform on a plurality of physical sidelink shared channel (PSSCH) resource blocks; Receiving mapped channel state information reference signals (CSI-RS) on the plurality of PSSCH resource blocks, wherein the mapped CSI-RS is interleaved with resource elements in at least a portion of the plurality of PSSCH resource blocks; processing the CSI-RS received on the plurality of PSSCH resource blocks; and Through the processing, a channel quality of the sidelink channel is determined based on the portion of the plurality of PSSCH resource blocks including the mapped CSI-RS.

2. The method according to claim 1, wherein: The mapped CSI-RS are interleaved with the resource elements via one of a comb-6, comb-4, comb-3, comb-2, or comb-1 structure.

3. The method according to claim 1, wherein: Processing the CSI-RS received on the plurality of PSSCH resource blocks includes code division multiplexing (CDM) in two consecutive combs.

4. The method according to claim 1, wherein: Processing the CSI-RS received on the plurality of PSSCH resource blocks includes applying an orthogonal cover code (OCC) in at least one of a frequency domain and / or a time domain.

5. The method according to claim 1, wherein: The mapped CSI-RS is mapped on one or two ports.

6. The method according to claim 1, wherein: The mapped CSI-RS are mapped to adjacent symbols in the interleaved resource elements in at least some of the plurality of PSSCH resource blocks.

7. The method according to claim 1, wherein: The mapped CSI-RS is mapped to distributed symbols in interleaved resource elements in at least some of the plurality of PSSCH resource blocks.

8. The method according to claim 1, wherein: The mapped CSI-RS are mapped to consecutive symbols in interleaved resource elements in at least some of the plurality of PSSCH resource blocks.

9. A user equipment (UE) for wireless communication, comprising: Transceiver; at least one processor; as well as a memory coupled to the at least one processor, the at least one processor and the memory being configured to: establishing communications on a sidelink channel, including receiving at least one physical sidelink shared channel (PSSCH) configured as a staggered waveform on a plurality of physical sidelink shared channel (PSSCH) resource blocks; Receiving mapped channel state information reference signals (CSI-RS) on the plurality of PSSCH resource blocks, wherein the mapped CSI-RS is interleaved with resource elements in at least a portion of the plurality of PSSCH resource blocks; processing the CSI-RS received on the plurality of PSSCH blocks; and Through the processing, a channel quality of the sidelink channel is determined based on the portion of the plurality of PSSCH resource blocks including the mapped CSI-RS.

10. The UE according to claim 9, wherein: The mapped CSI-RS are interleaved with the resource elements via one of a comb-6, comb-4, comb-3, comb-2, or comb-1 structure.

11. The UE according to claim 9, wherein: The at least one processor and the memory are configured to process the CSI-RS received on the plurality of PSSCH resource blocks using code division multiplexing (CDM) in two consecutive combs.

12. The UE according to claim 9, wherein: The at least one processor and the memory are configured to process the CSI-RS received on the plurality of PSSCH resource blocks by applying an orthogonal cover code (OCC) in at least one of a frequency domain and / or a time domain.

13. The UE according to claim 9, wherein: The mapped CSI-RS is mapped on one or two ports.

14. The UE according to claim 9, wherein: The mapped CSI-RS are mapped to adjacent symbols in the interleaved resource elements in at least some of the plurality of PSSCH resource blocks.

15. The UE according to claim 9, wherein: The mapped CSI-RS is mapped to distributed symbols in interleaved resource elements in at least some of the plurality of PSSCH resource blocks.

16. The UE according to claim 9, wherein: The mapped CSI-RS are mapped to consecutive symbols in interleaved resource elements in at least some of the plurality of PSSCH resource blocks.

17. A non-transitory computer-readable medium storing computer-executable code at a user equipment (UE), comprising code for causing a computer to: establishing communications on a sidelink channel, including receiving at least one physical sidelink shared channel (PSSCH) configured as a staggered waveform on a plurality of physical sidelink shared channel (PSSCH) resource blocks; The mapped channel state information reference signal CSI-RS is received on the plurality of PSSCH resource blocks, wherein: The mapped CSI-RS is interleaved with resource elements in at least a portion of the plurality of PSSCH resource blocks; processing the CSI-RS received on the plurality of PSSCH blocks; as well as Through the processing, a channel quality of the sidelink channel is determined based on the portion of the plurality of PSSCH resource blocks including the mapped CSI-RS.

18. The non-transitory computer readable medium of claim 17, wherein: The mapped CSI-RS are interleaved with the resource elements via one of a comb-6, comb-4, comb-3, comb-2, or comb-1 structure.

19. The non-transitory computer readable medium of claim 17, wherein: Processing the CSI-RS received on the plurality of PSSCH resource blocks includes code division multiplexing (CDM) in two consecutive combs.

20. The non-transitory computer readable medium of claim 17, wherein: Processing the CSI-RS received on the plurality of PSSCH resource blocks includes applying an orthogonal cover code (OCC) in at least one of a frequency domain and / or a time domain.

21. The non-transitory computer readable medium of claim 17, wherein: The mapped CSI-RS is mapped on one or two ports.

22. The non-transitory computer readable medium of claim 17, wherein: The mapped CSI-RS are mapped to adjacent symbols in the interleaved resource elements in at least some of the plurality of PSSCH resource blocks.

23. The non-transitory computer readable medium of claim 17, wherein: The mapped CSI-RS is mapped to distributed symbols in interleaved resource elements in at least some of the plurality of PSSCH resource blocks.

24. The non-transitory computer readable medium of claim 17, wherein: The mapped CSI-RS are mapped to consecutive symbols in interleaved resource elements in at least some of the plurality of PSSCH resource blocks.

25. A user equipment (UE) for wireless communication, comprising: Means for establishing communications on a sidelink channel, including means for receiving at least one PSSCH configured as a staggered waveform on a plurality of physical sidelink shared channel (PSSCH) resource blocks; means for receiving mapped channel state information reference signals (CSI-RS) on the plurality of PSSCH resource blocks, wherein the mapped CSI-RS are interleaved with resource elements in at least a portion of the plurality of PSSCH resource blocks; means for processing the CSI-RS received on the plurality of PSSCH blocks; and and means for determining, by the processing, a channel quality of the sidelink channel based on the portion of the plurality of PSSCH resource blocks including the mapped CSI-RS.

26. The UE according to claim 25, wherein: The mapped CSI-RS are interleaved with the resource elements via one of a comb-6, comb-4, comb-3, comb-2, or comb-1 structure.

27. The UE according to claim 25, wherein: The means for processing processes the CSI-RS received on the plurality of PSSCH resource blocks using code division multiplexing (CDM) in two consecutive combs.

28. The UE according to claim 25, wherein: The means for processing processes the CSI-RS received on the plurality of PSSCH resource blocks by applying an orthogonal cover code (OCC) in at least one of a frequency domain and / or a time domain.

29. The UE according to claim 25, wherein: The mapped CSI-RS is mapped on one or two ports.

30. The UE according to claim 25, wherein: The mapped CSI-RS are mapped to adjacent symbols in the interleaved resource elements in at least some of the plurality of PSSCH resource blocks.

31. The UE according to claim 25, wherein: The mapped CSI-RS is mapped to distributed symbols in interleaved resource elements in at least some of the plurality of PSSCH resource blocks.

32. The UE according to claim 25, wherein: The mapped CSI-RS are mapped to consecutive symbols in interleaved resource elements in at least some of the plurality of PSSCH resource blocks.

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