Reserve resources for subsequent sidelink transmissions via initial sidelink control information communication

Abstract

Various aspects of reserving resources for sidelink communications are disclosed. In one example, an initial sidelink communication is transmitted that includes an indication of resources reserved for subsequent sidelink communications. Based on transmission characteristics associated with transmitting the initial sidelink communication, a transmission constraint is applied to the subsequent sidelink communication. The subsequent sidelink communication is then transmitted according to the transmission constraint.

Description

[0001] Priority claim

[0002] This application claims priority to and the benefit of Non-Provisional Patent Application No. 16 / 950,784 filed in the U.S. Patent and Trademark Office on November 17, 2020, and Provisional Patent Application No. 62 / 937,194 filed in the U.S. Patent and Trademark Office on November 18, 2019, the entire contents of which are incorporated herein by reference as if fully set forth below and for all applicable purposes. Technical Field

[0003] The techniques discussed below relate generally to wireless communication systems, and more particularly to utilizing initial sidelink control information (SCI) communications to reserve resources for subsequent sidelink transmissions.

[0004] introduction

[0005] Sidelink communication was initially introduced as a Long Term Evolution (LTE) feature to enable device-to-device (D2D) communication within legacy cellular-based LTE radio access networks. In comparison, in legacy uplink / downlink, a user equipment (UE) can communicate with another UE via a Uu interface and the data passes through the LTE eNode B (eNB). However, sidelink enables direct communication between neighboring UEs using the newly defined PC5 interface so that the data does not need to pass through the eNB.

[0006] Sidelink communications will continue to be supported by 5G New Radio (NR) networks. For reserving resources for sidelink communications, the UE may utilize control information to reserve resources for sidelink communications.

[0007] A brief overview of some examples

[0008] An overview of one or more aspects of the present disclosure is given below to provide a basic understanding of these aspects. This overview is not an exhaustive overview of all conceived features of the present disclosure, and is neither intended to identify the key or decisive elements of all aspects of the present disclosure nor to attempt to define 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 form as a preface to a more detailed description given later.

[0009] In one example, a method of wireless communication by a user equipment (UE) is disclosed. The method includes: transmitting an initial sidelink communication, wherein an initial sidelink control information (SCI) transmission includes an indication of resources reserved for subsequent sidelink communications; applying a transmission constraint to the subsequent sidelink communication, wherein the transmission constraint is based on a transmission characteristic associated with transmitting the initial sidelink communication; and transmitting the subsequent sidelink communication according to the transmission constraint.

[0010] In another example, a UE for wireless communication is disclosed. The UE includes at least one processor, a transceiver communicatively coupled to the at least one processor, and a memory communicatively coupled to the at least one processor. The at least one processor can be configured to transmit an initial side link communication, wherein the initial SCI transmission includes an indication of resources reserved for subsequent side link communications; apply a transmission constraint to the subsequent side link communication, wherein the transmission constraint is based on a transmission characteristic associated with transmitting the initial side link communication; and transmit the subsequent side link communication according to the transmission constraint.

[0011] In another example, a non-transitory computer-readable storage medium having instructions for a UE thereon may be disclosed. The instructions, when executed by a processing circuit, cause the processing circuit to transmit an initial sidelink communication, wherein the initial SCI transmission includes an indication of resources reserved for subsequent sidelink communications; apply a transmission constraint to the subsequent sidelink communication, wherein the transmission constraint is based on a transmission characteristic associated with transmitting the initial sidelink communication; and transmit the subsequent sidelink communication in accordance with the transmission constraint.

[0012] In a further example, a UE for wireless communication may be disclosed. The UE includes: means for transmitting an initial sidelink communication, wherein the initial SCI transmission includes an indication of resources reserved for subsequent sidelink communications; means for applying a transmission constraint to the subsequent sidelink communication, wherein the transmission constraint is based on a transmission characteristic associated with transmitting the initial sidelink communication; and means for transmitting the subsequent sidelink communication in accordance with the transmission constraint.

[0013] These and other aspects of the present invention will be more fully understood after reading the following detailed description. After reading the description of the specific examples of the present invention below in conjunction with the accompanying drawings, other aspects, features and examples of the present invention will become apparent to those of ordinary skill in the art. Although the features of the present invention may be discussed below with respect to certain examples and drawings, all examples of the present invention may include one or more of the advantageous features discussed herein. In other words, although one or more examples may be discussed as having certain advantageous features, one or more of such features may also be used according to the various examples of the present invention discussed herein. In a similar manner, although each example may be discussed below as an example of a device, system or method, it should be understood that such examples may be implemented in various devices, systems, and methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic illustration of a wireless communication system in accordance with some aspects.

[0016] Figure 2is a conceptual illustration of an example of a radio access network in accordance with some aspects.

[0017] Figure 3 is a diagram illustrating an example of a wireless communication network that employs sidelink communications in accordance with some aspects.

[0018] Figure 4 is a diagram illustrating an example of a wireless communication system for facilitating both cellular and sidelink communications in accordance with some aspects.

[0019] Figure 5 is a schematic illustration of the organization of wireless resources in an air interface utilizing orthogonal frequency division multiplexing (OFDM) according to some aspects.

[0020] Figure 6

[0013] Illustrated are example reservations of resources for transmitting subsequent sidelink communications in accordance with some aspects.

[0021] Figure 7 is an example flow diagram illustrating sidelink communication between two user equipments in accordance with some aspects.

[0022] Figure 8 is a block diagram illustrating an example of a hardware implementation for a wireless communication device employing a processing system in accordance with some aspects.

[0023] Fig. 9 is a flow chart illustrating an exemplary wireless communication device process that facilitates certain aspects.

[0024] Fig.10 is a flow chart illustrating an exemplary wireless communication device process that facilitates certain aspects.

[0025] Fig.11 is a flow chart illustrating an exemplary wireless communication device process that facilitates certain aspects.

[0026] Detailed Description

[0027] 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 practiced. This detailed description includes specific details to provide a thorough understanding of the various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well-known structures and components are shown in block diagram form in order to avoid diluting such concepts.

[0028] Although various aspects and examples are described in this application by explaining some examples, it will be understood by those skilled in the art that additional implementations and use cases can be generated in many different arrangements and scenarios. The innovation described herein can be implemented across many different platform types, devices, systems, shapes, sizes, and packaging arrangements. For example, each example and / or use can be generated via an integrated chip example and other devices based on non-module components (e.g., end-user devices, vehicles, communication equipment, computing equipment, industrial equipment, retail / shopping equipment, medical equipment, AI-enabled devices, etc.). Although some examples may or may not be specifically for each use case or application, the wide applicability of the described innovation may occur. The scope of each implementation can range from chip-level or module components to non-module, non-chip-level implementations, and further to the aggregation, distributed or OEM devices or systems incorporating one or more aspects of the described innovation. In some practical environments, the equipment incorporating the various aspects and features described may also necessarily include additional components and features for implementing and practicing the claimed and described examples. For example, the transmission and reception of wireless signals necessarily include several components for analog and digital purposes (e.g., hardware components, including antennas, RF chains, power amplifiers, modulators, buffers, processors, interleavers, adders / summers, etc.). The innovations described herein are intended to be practiced in a wide variety of devices, chip-level components, systems, distributed arrangements, end-user devices, etc., of various sizes, shapes, and configurations.

[0029] Various aspects are disclosed relating to a wireless communication device, such as a user equipment (UE). In one example, the wireless communication device transmits an initial sidelink communication based on an initial precoder, wherein the initial sidelink communication includes an initial sidelink control information (SCI) transmission and a corresponding initial sidelink data transmission. The initial SCI transmission may further include an indication of resources reserved for subsequent sidelink communications. The wireless communication device may also apply a transmission constraint to a subsequent sidelink communication, wherein the subsequent sidelink communication includes a subsequent SCI transmission and a corresponding subsequent sidelink data transmission. For example, the transmission constraint may be based on a transmission characteristic associated with transmitting the initial sidelink communication. The wireless communication device then transmits the subsequent sidelink communication based on the transmission constraint.

[0030] The various concepts presented throughout this disclosure may be implemented across a wide variety of telecommunication systems, network architectures, and communication standards. Figure 1, various aspects of the present disclosure are explained with reference to a wireless communication system 100 as an illustrative example and not as a limitation. The wireless communication system 100 includes three interacting domains: a core network 102, a radio access network (RAN) 104, and a user equipment (UE) 106. By means of the wireless communication system 100, the UE 106 may be enabled to perform data communications with an external data network 110, such as, but not limited to, the Internet.

[0031] The RAN 104 may implement any suitable one or more wireless communication technologies to provide radio access to the UE 106. As an example, the RAN 104 may operate in accordance with the 3rd Generation Partnership Project (3GPP) New Radio (NR) specifications, commonly referred to as 5G. As another example, the RAN 104 may operate under a mix of 5G NR and Evolved Universal Terrestrial Radio Access Network (eUTRAN) standards, commonly referred to as LTE. 3GPP refers to this hybrid RAN as the Next Generation RAN, or NG-RAN. Of course, many other examples may be utilized within the scope of the present disclosure.

[0032] As illustrated, the RAN 104 includes a plurality of base stations 108. Broadly speaking, 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 cellular cells. In different technologies, standards, or contexts, a base station may be referred to as a base transceiver station (BTS), a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), an access point (AP), a B node (NB), an e B node (eNB), a g B node (gNB), a transmission reception point (TRP), or some other suitable terminology by those skilled in the art. In some examples, a base station may include two or more TRPs that may be co-located or non-co-located. Each TRP may communicate on the same or different carrier frequencies in the same or different frequency bands.

[0033] The radio access network 104 is further illustrated as supporting wireless communications for multiple mobile devices. A mobile device may be referred to as a user equipment (UE) in the 3GPP standard, but may also be referred to as a mobile station (MS), a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber 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 suitable terminology by those skilled in the art. A UE may be a device that provides a user with access to network services.

[0034] Within this document, a "mobile" device does not necessarily need to have mobile capabilities, and may be stationary. The term mobile device or mobile equipment refers broadly to a wide variety of devices and technologies. A UE may include several hardware structural components sized, shaped, and arranged to facilitate communication; such components may include antennas, antenna arrays, RF chains, amplifiers, one or more processors, and the like electrically coupled to each other. For example, some non-limiting examples of mobile devices include mobile devices, cellular (cell) phones, smart phones, Session Initiation Protocol (SIP) phones, laptops, personal computers (PCs), notebooks, netbooks, smartbooks, tablet devices, personal digital assistants (PDAs), and a wide variety of embedded systems, for example, corresponding to the "Internet of Things" (IoT). Additionally, the mobile device may be a car or other transportation vehicle, a remote sensor or actuator, a robot or robotic device, a satellite radio, a global positioning system (GPS) device, an object tracking device, a drone, a multicopter, a quadcopter, a remote control device, a consumer and / or wearable device (such as glasses), a wearable camera, a virtual reality device, a smart watch, a health or fitness tracker, a digital audio player (e.g., an MP3 player), a camera, a game console, etc. The mobile device may also be a digital home or smart home device, such as home audio, video and / or multimedia equipment, an appliance, a vending machine, a smart lighting device, a home security system, a smart meter, etc. The mobile device may also be a smart energy device, a security device, a solar panel or solar array, a municipal infrastructure device that controls power, lighting, water, etc. (e.g., a smart grid), an industrial automation and enterprise device, a logistics controller, an agricultural equipment, etc. Still further, the mobile device may provide connected medical or telemedicine support, such as health care at a distance. Telehealth devices may include telehealth monitoring devices and telehealth supervisory devices, whose communications may be given priority or prioritized access over other types of information, for example in the form of prioritized access for critical service data transmission and / or associated QoS for critical service data transmission.

[0035] Wireless communication between RAN 104 and UE 106 may 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 may be referred to as downlink (DL) transmissions. According to certain aspects of the present disclosure, the term downlink may refer to a point-to-multipoint transmission originating at a scheduling entity (further described below, e.g., base station 108). Another way to describe this scheme may be to use the term broadcast channel multiplexing. Transmissions from a UE (e.g., UE 106) to a base station (e.g., base station 108) may be referred to as uplink (UL) transmissions. According to further aspects of the present disclosure, the term uplink may refer to a point-to-point transmission originating at a scheduled entity (further described below; e.g., UE 106).

[0036] 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 among some or all devices and equipment within its service area or cell. Within the present disclosure, as discussed further 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 utilize resources allocated by the scheduling entity 108.

[0037] Base station 108 is not the only entity that may function as a scheduling entity. That is, in some examples, a UE may function as a scheduling entity, scheduling resources for one or more scheduled entities (eg, one or more other UEs).

[0038] like Figure 1 , the scheduling entity 108 may broadcast downlink traffic 112 to one or more scheduled entities 106. Broadly speaking, the scheduling entity 108 is a node or device responsible for scheduling traffic in the wireless communication network, including downlink traffic 112 and, in some examples, uplink traffic 116 from one or more scheduled entities 106 to the scheduling entity 108. On the other hand, the scheduled entity 106 is a node or device that receives downlink control information 114 (including but not limited to scheduling information (e.g., grants), synchronization or timing information), or other control information from another entity in the wireless communication network, such as the scheduling entity 108.

[0039] In general, the base stations 108 may include a backhaul interface for communicating with a backhaul portion 120 of the wireless communication system. The backhaul 120 may provide a link between the base stations 108 and the core network 102. Furthermore, in some examples, the backhaul network may provide interconnections between the respective base stations 108. Various types of backhaul interfaces may be employed, such as a direct physical connection using any suitable transport network, a virtual network, and the like.

[0040] 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 suitable standard or configuration.

[0041] Now refer to Figure 2 , a schematic illustration of RAN 200 is provided by way of example and not limitation. In some examples, RAN 200 may be similar to that described above and in Figure 1 The geographic area covered by the RAN 200 may be divided into cellular areas (cells) that may be uniquely identified by a user equipment (UE) based on an identity broadcast from an access point or base station. Figure 2 Macro cells 202, 204, and 206, and small cells 208 are illustrated, each of which may include one or more sectors (not shown). A sector is a sub-area of ​​a cell. All sectors within one cell are served by the same base station. A radio link within a sector may be identified by a single logical identification belonging to the sector. In a cell divided into sectors, multiple sectors within a cell may be formed by antenna groups, where each antenna is responsible for communication with UEs in a portion of the cell.

[0042] exist Figure 2 , two base stations 210 and 212 are shown in the cellular cells 202 and 204; and the third base station 214 is shown as controlling the remote radio head (RRH) 2216 in the cellular cell 206. That is, the base station may have an integrated antenna, or may be connected to the antenna or RRH by a feeder cable. In the illustrated example, the cellular cells 202, 204, and 206 may be referred to as macro cells because the base stations 210, 212, and 214 support cellular cells with large sizes. In addition, the 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 B node, a home evolved B node, etc.), which may overlap with one or more macro cells. In this example, the cellular cell 208 may be referred to as a small cell because the base station 218 supports a cellular cell with a relatively small size. The cellular cell size setting may be completed according to the system design and component constraints.

[0043] It is to be understood that the radio access network 200 may include any number of wireless base stations and cellular cells. In addition, relay nodes may be deployed to extend the size or coverage area of ​​a given cellular 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 same as the base station / scheduling entity 108 illustrated in FIG.

[0044] Figure 2 Further 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).

[0045] Within the RAN 200, cells may include UEs that may be in communication with one or more sectors of each cell. In addition, each base station 210, 212, 214, 218, and 220 may be configured to provide a core network 102 (see FIG. 1 ) for all UEs in the corresponding cell. Figure 1 ) access point. For example, UEs 222 and 224 may be in communication with base station 210; UEs 226 and 228 may be in communication with base station 212; UEs 230 and 232 may be in communication with base station 214 via RRH 216; UE 234 may be in communication with base station 218; and UE 236 may be in communication with mobile base station 220. In some examples, UEs 222, 224, 226, 228, 230, 232, 234, 236, 238, 240, and / or 242 may be in communication with the mobile base station 220 described above and in Figure 1 The UE / scheduled entity 106 is the same as illustrated in FIG.

[0046] In some examples, a mobile network node (eg, quadcopter 220) can be configured to function as a UE. For example, quadcopter 220 can operate within cell 202 by communicating with base station 210.

[0047] In various implementations, the air interface in the radio access network 200 may utilize a licensed spectrum, an unlicensed spectrum, or a shared spectrum. A licensed spectrum generally provides exclusive use of a portion of the spectrum by a mobile network operator purchasing a license from a government regulator. An unlicensed spectrum provides shared use of a portion of the spectrum without a government-granted license. Although some technical rules generally still need to be followed to access the unlicensed spectrum, any operator or device can obtain access. A shared spectrum may fall between licensed and unlicensed spectrum, where technical rules or restrictions may be required to access the spectrum, but the spectrum may still be shared by multiple operators and / or multiple RATs. For example, a license holder of a portion of a licensed spectrum may provide licensed shared access (LSA) to share the spectrum with other parties, for example, using conditions determined by the appropriate license holder to obtain access.

[0048] The air interface in the radio access network 200 may utilize one or more duplex algorithms. Duplex refers to a point-to-point communication link in which both endpoints can communicate with each other in two directions. Full-duplex means that both endpoints can communicate with each other at the same time. Half-duplex means that only one endpoint can send information to the other endpoint at a time. Time division duplex (TDD) is often used to implement half-duplex simulation for wireless links. In TDD, transmissions in different directions on a given channel are separated from each other using time division multiplexing. That is, at some times, the channel is dedicated to transmissions in one direction, and at other times, the channel is dedicated to transmissions in another direction, where the direction can change very quickly, for example, several times per time slot. In wireless links, full-duplex channels generally rely on physical isolation of transmitters and receivers, and suitable interference cancellation techniques. Full-duplex simulation is often implemented for wireless links by utilizing frequency division duplex (FDD) or space division duplex (SDD). In FDD, transmissions in different directions can operate at different carrier frequencies (e.g., within a paired spectrum). In SDD, transmissions in different directions on a given channel are separated from each other using spatial division multiplexing (SDM). In other examples, full-duplex communication may be implemented within an unpaired spectrum (e.g., within a single carrier bandwidth), where transmissions in different directions occur within different sub-bands of the carrier bandwidth. This type of full-duplex communication may be referred to herein as sub-band full-duplex (SBFD), also known as flexible duplex.

[0049] The air interface in the radio access network 200 may utilize 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 UE 222 and 224 to base station 210, and multiplexing for DL ​​transmissions from 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.

[0050] In further aspects of the RAN 200, sidelink signals may be used between UEs without having to rely on scheduling or control information from a base station. For example, two or more UEs (e.g., UEs 238, 240, and 242) may communicate with each other using peer-to-peer (P2P) or sidelink signals 237 without relaying the communication through a base station. In some examples, UEs 238, 240, and 242 may each act as a scheduling entity or a transmitting sidelink device and / or a scheduled entity or a receiving sidelink device to schedule resources and communicate sidelink signals 237 therebetween. In other examples, two or more UEs (e.g., UEs 226 and 228) within the coverage area of ​​a base station (e.g., base station 212) may also communicate sidelink signals 227 on a direct link (sidelink) without having to communicate the communication through base station 212. In this example, base station 212 may allocate resources to UEs 226 and 228 for sidelink communication. In either case, such sidelink signaling 227 and 237 may be implemented in a P2P network, a device-to-device (D2D) network, a vehicle-to-vehicle (V2V) network, a vehicle-to-everything (V2X), a mesh network, or other suitable direct link network.

[0051] Two main technologies that can 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. Various aspects of the present disclosure may relate to New Radio (NR) cellular V2X networks, which for simplicity are 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 refer to sidelink networks other than V2X networks.

[0052] In some examples, see again Figure 1 , scheduled entities (such as the first scheduled entity 106 and the second scheduled entity 107) may utilize sidelink signals for direct D2D communication (e.g., V2X communication). The sidelink signals may include sidelink traffic 113 and sidelink control 115. In some examples, the sidelink control 115 may include synchronization information to synchronize communications on the sidelink channel. In addition, the sidelink control 115 may include scheduling information indicating one or more resource blocks reserved by the transmitting sidelink device for transmitting the sidelink traffic 113 to the receiving sidelink device. In some examples, the scheduling information may further include information related to the traffic 113, such as a modulation and coding scheme for the traffic 113. In some examples, the sidelink control 115 may be transmitted within a physical sidelink control channel (PSCCH), and the sidelink data 130 may be transmitted within a physical sidelink shared channel (PSSCH).

[0053] In certain aspects, a scheduled entity 106 that is out of base station coverage (OOC) and has lost synchronization with a synchronization source upon which V2X communications are based may maintain V2X communications based on packet timing information received from other synchronized devices (e.g., scheduled entity 107). The timing of V2X communications may be further based on higher layer parameter values ​​from the respective other synchronized devices. As an example, the scheduled entity 106 may receive proximity service (ProSe) PC5 transmissions from two or more peer UEs including a first scheduled entity and a second scheduled entity. If the first scheduled entity has low propagation delay and high time confidence (as seen by the scheduled entity 106), then the timing estimate based on the first scheduled entity may be better (i.e., closer to satellite timing) than the timing estimate based on the timing of the second scheduled entity, which may have high propagation delay and low time confidence. Higher layer metrics (such as time confidence parameters, positioning uncertainty parameters, or others) may be obtained from higher layer messages. An example of a higher layer message including this information is a basic security message, which may be required by certain communication standards. In some cases, basic security messages are transmitted periodically, such as every 100 milliseconds. Based on higher layer parameters, the scheduled entity 106 can determine how much priority (i.e., trust or weight) is to be given to the packets from a specific scheduled entity. Although some devices may have better timing estimates, those devices with smaller estimates can still help improve the accuracy of the calculated timing because the calculated timing can be statistically improved by using timing estimates from a larger number of peer devices. In some cases, zero weights can be applied to effectively remove estimates for specific peer devices from the calculated timing adjustment. In other cases, a non-zero weight for the first scheduled entity can be assigned, which is less than the non-zero weight of the second scheduled entity. Further discussion of the weights generated for a specific scheduled entity and used to calculate weighted timing adjustments is provided below.

[0054] Figure 3 An example of a wireless communication network 300 configured to support D2D or sidelink communication is illustrated. In some examples, the sidelink communication may include V2X communication. V2X communication involves not only the direct wireless information exchange between the vehicles (e.g., vehicles 302 and 304) themselves, but also the direct wireless information exchange between the vehicles 302 / 304 and infrastructure (e.g., roadside units (RSUs) 306) (such as street lights, buildings, traffic cameras, toll booths or other stationary objects), vehicles 302 / 304 and pedestrians 308, and vehicles 302 / 304 and wireless communication networks (e.g., base stations 310). In some examples, V2X communication can be implemented according to the new radio (NR) cellular V2X standard defined by 3GPP (Release 16) or other suitable standards.

[0055] V2X communication enables vehicles 302 and 304 to obtain information about weather, nearby accidents, road conditions, activities of nearby vehicles and pedestrians, objects near the vehicle, and other relevant information that can be used to improve the vehicle driving experience and improve vehicle safety. For example, such V2X data can enable autonomous driving and improve road safety and traffic efficiency. For example, V2X-connected vehicles 302 and 304 can use the exchanged V2X data to provide vehicle collision warnings, road hazard warnings, approaching emergency vehicle warnings, pre-impact / post-impact warnings and information, emergency braking warnings, forward traffic jam warnings, lane change warnings, smart navigation services, and other similar information. In addition, the V2X data received by the V2X-connected mobile device of the pedestrian / cyclist 308 can be used to trigger warning sounds, vibrations, flashing lights, etc. in situations where danger is about to occur.

[0056] Sidelink communications between vehicle UEs (V-UEs) 302 and 304, or between V-UEs 302 or 304 and RSUs 306 or pedestrian UEs (P-UEs) 308, occur over a proximity services (ProSe) PC5 interface 312. In various aspects of the present disclosure, the PC5 interface 312 may be further used to support D2D communications in other proximity use cases. Examples of other proximity use cases may include public safety or business-based (e.g., entertainment, education, office, medical, and / or interactive) proximity services. Figure 3 In the example shown in , ProSe communication may further occur between UEs 314 and 316 .

[0057] ProSe communication may support different operation scenarios, such as in-coverage, out-of-coverage, and partial coverage. Out-of-coverage refers to a scenario where UEs (e.g., V-UEs 302 and 304 and P-UE 308) are outside the coverage area of ​​a base station (e.g., base station 310), but each UE is still configured for ProSe communication. Partial coverage refers to a scenario where some of these UEs (e.g., V-UE 304) are outside the coverage area of ​​the base station 310, while other UEs (e.g., V-UE 302 and P-UE 308) are in communication with the base station 310. In-coverage refers to a scenario where UEs (e.g., UEs 314 and 316) are in communication with the base station 310 (e.g., gNB) via a Uu (e.g., cellular interface) connection to receive ProSe service authorization and provisioning information to support ProSe operation.

[0058] Figure 4is a diagram illustrating an example of a wireless communication system 400 for facilitating both cellular communication and sidelink communication. The wireless communication system 400 includes a plurality of UEs 402a, 402b, and 402c and a base station (e.g., an eNB or gNB) 406. In some examples, the UEs 402a, 402b, and 402c may be UEs capable of implementing D2D or V2X devices (e.g., RSUs, V-UEs, P-UEs, etc.) within a V2X network.

[0059] UEs 402a and 402b may communicate over a first PC5 interface 404a, and UEs 402a and 402c may communicate over a second PC5 interface 404b. UEs 402a, 402b, and 402c may further communicate with a base station 406 over respective Uu interfaces 408a, 408b, and 408c. Sidelink communications over PC5 interfaces 404a and 404b may be carried in a licensed frequency domain, for example, using radio resources operating in accordance with 5G NR or NR sidelink (SL) specifications, and / or carried in an unlicensed frequency domain using radio resources operating in accordance with 5G unlicensed new radio (NR-U) specifications.

[0060] In some examples, a common carrier may be shared between the PC5 interfaces 404a and 404b and the Uu interfaces 408a-408c so that resources on the common carrier may be allocated for both sidelink communications between UEs 402a-402c and cellular communications (e.g., uplink and downlink communications) between UEs 402a-402c and base station 406. For example, the wireless communication system 400 may be configured to support a V2X network in which resources for both sidelink communications and cellular communications are scheduled by base station 406. In other examples, UEs 402a-402c may autonomously select (e.g., from one or more frequency bands or subbands designated for sidelink communications) sidelink resources for communications therebetween. In this example, UEs 402a-402c may function as both a scheduling entity and a scheduled entity that schedules sidelink resources for communications with each other. Now referring to Figure 5 , illustrates an expanded view of an exemplary subframe 502 showing an OFDM resource grid. However, as will be readily appreciated by 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 measured in units of OFDM symbols in the horizontal direction; and frequency is measured in units of subcarriers of a carrier in the vertical direction.

[0061] Resource grid 504 can be used to schematically represent the time-frequency resources for a given antenna port. That is, in a multiple-input multiple-output (MIMO) implementation with multiple antenna ports available, there may be a corresponding multiple number of resource grids 504 available for communication. Resource grid 504 is divided into multiple resource elements (REs) 506. RE (which is 1 subcarrier × 1 symbol) is the smallest discrete part of the time-frequency grid and contains a single complex value representing data from a physical channel or signal. Depending on the modulation utilized in a particular implementation, each RE may represent one or more information bits. In some examples, a block of REs may be referred to as a physical resource block (PRB) or more simply a resource block (RB) 508, which contains any suitable number of consecutive subcarriers in the frequency domain. In one example, an RB may include 12 subcarriers, which number is independent of the parameter design used. In some examples, depending on the parameter set, an RB may include any suitable number of consecutive OFDM symbols in the time domain. Within the present disclosure, it is assumed that a single RB (such as RB 508) corresponds entirely to a single communication direction (transmission or reception for a given device).

[0062] Scheduling of a UE or sidelink device (hereinafter collectively referred to as a UE) for downlink, uplink, or sidelink transmissions typically involves scheduling one or more resource elements 506 within one or more subbands. Thus, the UE typically utilizes only a subset of the resource grid 504. In some examples, an RB may be the smallest resource unit 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. The RBs may be scheduled by a base station (e.g., a gNB, an eNB, etc.) or may be self-scheduled by the UE / sidelink device implementing the D2D sidelink communication.

[0063] In this illustration, RB 508 is shown as occupying less than the entire bandwidth of subframe 502, with some subcarriers illustrated above and below RB 508. In a given implementation, subframe 502 may have a bandwidth corresponding to any number of one or more RBs 508. Furthermore, in this illustration, RB 508 is shown as occupying less than the entire duration of subframe 502, but this is merely one possible example.

[0064] Each 1 ms subframe 502 may include one or more adjacent time slots. Figure 5In the example shown in , a subframe 502 includes four time slots 510. In some examples, a time slot may be defined according to a specified number of OFDM symbols with a given cyclic prefix (CP) length. For example, a time slot may include 7 or 14 OFDM symbols with a nominal CP. Additional examples may include mini-slots (sometimes referred to as shortened transmission time intervals (TTIs)) with shorter durations (e.g., one to three OFDM symbols). In some cases, these mini-slots or shortened transmission time intervals (TTIs) may occupy resources scheduled for ongoing time slot transmissions for the same or different UEs to transmit. Any number of resource blocks may be utilized within a subframe or time slot.

[0065] An expanded view of one of the time slots 510 illustrates that the time slot 510 includes a control region 512 and a data region 514. In general, the control region 512 may carry control channels, while the data region 514 may carry data channels. Of course, a time slot may contain full DL, full UL, or at least one DL portion and at least one UL portion. Figure 5 The simple structure illustrated in is merely exemplary in nature and different slot structures may be utilized and may include one or more of each of the control region and the data region.

[0066] Although not in Figure 5 508, but each RE 506 within the RB 508 may be scheduled to carry one or more physical channels, including a control channel, a shared channel, a data channel, etc. Other REs 506 within the RB 508 may also carry pilot or reference signals. These pilot or reference signals may be used by the receiving device to perform channel estimation for the corresponding channel, which may enable coherent demodulation / detection of the control and / or data channels within the RB 508.

[0067] In some examples, time slot 510 may be used for broadcast, multicast, groupcast, or unicast communications. For example, broadcast, multicast, or groupcast communications 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 or groupcast communications are delivered to multiple target recipient devices. Unicast communications may refer to point-to-point transmissions from one device to a single other device.

[0068] In an example of cellular communication on a cellular carrier via a Uu interface, for DL ​​transmission, a scheduling entity (e.g., a base station) may allocate one or more REs 506 (e.g., within a control region 512) to carry DL control information including one or more DL control channels (such as a physical downlink control channel (PDCCH)) to one or more scheduled entities (e.g., UEs). The PDCCH carries downlink control information (DCI), including but not limited to power control commands (e.g., one or more open-loop power control parameters and / or one or more closed-loop power control parameters), scheduling information, grants, and / or RE assignments for DL ​​and UL transmissions. The PDCCH may further carry HARQ feedback transmissions, such as an acknowledgment (ACK) or a negative acknowledgment (NACK). HARQ is a well-known technique to those of ordinary skill in the art, wherein for accuracy, the integrity of packet transmissions may be checked at the receiving side using, for example, any suitable 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 transmitted, and if it is not confirmed, a NACK may be transmitted. In response to the NACK, the transmitting device may send a HARQ retransmission, which may enable catch-up combining, incremental redundancy, and the like. The base station may further allocate one or more REs 506 (e.g., in the control region 512 or the data region 514) to carry other DL signals, such as a demodulation reference signal (DMRS); a phase tracking reference signal (PT-RS); a channel state information (CSI)-reference signal (CSI-RS); a primary synchronization signal (PSS); and a secondary synchronization signal (SSS). The UE may utilize the PSS and SSS to achieve radio frame, subframe, time slot, and symbol synchronization in the time domain, identify the center of the channel (system) bandwidth in the frequency domain, and identify the physical cell identity (PCI) of the cell. The synchronization signals PSS and SSS, as well as the PBCH and PBCH DMRS in some examples, may be transmitted in a synchronization signal block (SSB). The PBCH may further include a master information block (MIB), which includes various system information, and parameters for decoding a system information block (SIB). The SIB may be, for example, System Information Type 1 (SIB1), which may include various additional system information. Examples of system information transmitted in the MIB may include, but are not limited to, subcarrier spacing, system frame number, configuration of a PDCCH control resource set (CORESET) (e.g., PDCCH CORESET0), and search space for SIB1. Examples of additional system information transmitted in SIB1 may include, but are not limited to, random access search space, downlink configuration information, and uplink configuration information. The MIB and SIB1 together provide minimum system information (SI) for initial access.

[0069] In an UL transmission, a scheduled entity (e.g., a UE) may utilize one or more REs 506 to carry UL control information (UCI) to a scheduling entity, the UL control information comprising one or more UL control channels, such as a physical uplink control channel (PUCCH). The UCI may include various packet types and categories, including pilots, reference signals, and information configured to enable or assist in decoding uplink data transmissions. In some examples, the UCI may include a scheduling request (SR), i.e., a request by an entity scheduling to schedule an uplink transmission. Here, in response to the SR transmitted on the UCI, the scheduling entity may transmit downlink control information (DCI), which may schedule resources for uplink packet transmissions. The UCI may also include HARQ feedback, channel state feedback (CSF) (such as a CSI report), or any other suitable UCI.

[0070] In addition to control information, one or more REs 506 (e.g., within the data region 514) may also be allocated for data traffic. Such data 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. In some examples, one or more REs 506 within the data region 514 may be configured to carry other signals, such as one or more SIBs and DMRS.

[0071] In an example of sidelink communication on a sidelink carrier via a PC5 interface, the control region 512 of the time slot 510 may include a physical sidelink control channel (PSCCH), which includes sidelink control information (SCI) transmitted by an initiator (transmitter) sidelink device (e.g., V2X or other sidelink device) toward a group of one or more receiving sidelink devices. The data region 514 of the time slot 510 may include a physical sidelink shared channel (PSSCH), which includes sidelink data traffic transmitted by an initiator (transmitter) sidelink device in resources reserved by the transmitter sidelink device via SCI on the sidelink carrier. Other information may be further transmitted on each RE 506 within the time slot 510. For example, HARQ feedback information may be transmitted from the receiving sidelink device to the transmitting sidelink device in a physical sidelink feedback channel (PSFCN) within the time slot 510. In addition, one or more reference signals (such as sidelink SSB and / or sidelink CSI-RS) may be transmitted within the time slot 510.

[0072] These physical channels are generally multiplexed and mapped to transport channels for handling by the medium access control (MAC) layer. The transport channels carry information blocks, which are called transport blocks (TBs). The transport block size (TBS), which may correspond to the number of information bits, may be a controlled parameter based on the modulation and coding scheme (MCS) and the number of RBs in a given transmission.

[0073] Figure 5 The channels or carriers illustrated in are not necessarily all channels or carriers that may be utilized between devices, and one of ordinary skill in the art will recognize that other channels or carriers may be utilized in addition to those illustrated, such as other traffic, control, and feedback channels.

[0074] In 5G NR (e.g., V2X), sidelink communications may utilize transmit or receive resource pools. For example, the minimum resource allocation unit in frequency may be a subchannel (e.g., which may include, for example, 10, 15, 20, 25, 50, 75, or 100 contiguous RBs) and the minimum resource allocation unit in time may be a time slot. The radio resource control (RRC) configuration of the resource pool may be preconfigured (e.g., preloaded on the UE) or configured by a base station (e.g., gNB).

[0075] In addition, there may be two main resource allocation operation modes for sidelink (e.g., PC5) communications. In the first mode, Mode 1, a radio access network (RAN) node (e.g., gNB) may allocate resources to UEs for sidelink communications between these UEs in various ways. For example, the RAN node may dynamically allocate sidelink resources to the UE in response to a request for sidelink resources from the UE (e.g., dynamic grant). The RAN node may further activate a pre-configured sidelink grant (e.g., a configured grant) for sidelink communications between the UEs. In Mode 1, sidelink feedback may be reported back to the RAN node by the transmitting UE.

[0076] In the second mode, Mode 2, the UEs may autonomously select sidelink resources for sidelink communications therebetween. In some examples, the transmitting UE may perform resource / channel sensing to select unoccupied resources (e.g., subchannels) on the sidelink channel. The signaling on the sidelink is the same between the two modes. Therefore, from the perspective of the receiver, there is no difference between these modes.

[0077] In some examples, sidelink (e.g., PC5) communications may be scheduled using sidelink control information (SCI). SCI may include two SCI phases. Phase 1 sidelink control information (first phase SCI) may be referred to herein as SCI-1. Phase 2 sidelink control information (second phase SCI) may be referred to herein as SCI-2.

[0078] SCI-1 may be transmitted on a physical sidelink control channel (PSCCH). SCI-1 may include resource allocation for sidelink resources and information for the second stage (i.e., SCI-2) of decoding sidelink control information. SCI-1 may further identify the priority level (e.g., quality of service (QoS)) of PSSCH. For example, ultra-reliable low latency communication (URLLC) traffic may have a higher priority than text message traffic (e.g., short message service (SMS) traffic). SCI-1 may also include physical sidelink shared channel (PSSCH) resource assignment and resource reservation period (if enabled). In addition, SCI-1 may include a PSSCH demodulation reference signal (DMRS) mode (if more than one mode is configured). DMRS may be used by the receiver for radio channel estimation for demodulation of associated physical channels. As indicated, SCI-1 may also include information about SCI-2, for example, SCI-1 may disclose the format of SCI-2. Here, the format indicates the resource size of SCI-2 (e.g., the number of REs allocated for SCI-2), the number of PSSCH DMRS ports, and the modulation and coding scheme (MCS) index. In some examples, SCI-1 can use two bits to indicate the SCI-2 format. Thus, in this example, four different SCI-2 formats can be supported. SCI-1 may include other information for establishing and decoding PSSCH resources.

[0079] Various aspects disclosed herein are directed to utilizing initial sidelink control information (SCI) communications to reserve resources for subsequent sidelink transmissions. Transmissions in sidelink communications may include data and SCI. Sidelink communications between UEs may be reservation-based. For example, a UE may utilize the SCI (e.g., SCI-1) of a current sidelink communication to reserve up to two future resources for future sidelink communications. Figure 6 is an example diagram 600 illustrating exemplary resource reservation for transmitting subsequent sidelink communications in accordance with various aspects disclosed herein. Figure 6, the transmitting UE may transmit an initial (current) sidelink communication 610 within a resource 620 (e.g., a resource of a time slot). The initial sidelink communication 610 includes an initial SCI 612 transmitted within a first portion of the resource 620, which reserves a subsequent portion of the resource 620 for the initial sidelink data transmission. Here, the initial SCI 612 may be transmitted within a control portion 622 of the resource 620, and the sidelink data may be transmitted within a non-control portion 624 (e.g., a data portion) of the resource 620. The initial SCI 612 may be SCI-1. The initial SCI 612 may also reserve resources 650 for subsequent sidelink communications 640, wherein the resources 650 may include a control portion 652 for transmitting subsequent SCI 642 and a non-control portion 654 for transmitting sidelink data. Further, the initial SCI 612 may also reserve resources 670 for additional subsequent sidelink communications 670. Similarly, SCI 642 and SCI 672 may also reserve resources for any subsequent sidelink communications.

[0080] As discussed above, in Mode 2, the transmitting UE may autonomously allocate sidelink resources for sidelink communication without involving a base station. In Mode 2, the receiving UE may sense whether future resources reserved by the transmitting UE are available (e.g., available for use by the receiving UE and / or other UEs). For example, referring to Figure 6 , the receiving UE may be configured to receive the initial SCI 612 from the transmitting UE, decode the initial SCI 612, and perform power measurements (e.g., reference signal received power (RSRP) measurements) on the associated DMRS. The DMRS may be a control DMRS (e.g., a DMRS associated with the PSCCH) or a data DMRS (e.g., a DMRS associated with the PSSCH). The transmitting UE may transmit the DMRS after precoding the DMRS in the sidelink communication. If the power measurement does not exceed the threshold, the future resources 650, 680 are considered available, although both the transmitting UE and the receiving UE may use those future resources 650, 680 for transmission. That is, if the sensed power is low, it is expected that interference from the transmitting UE (or any other device) will not be significant, even if the two transmissions are on the same resources. On the other hand, if the power measurement exceeds the threshold, the future resources 650, 680 reserved by the initial SCI 104 are considered occupied. For example, if the power measurement exceeds a threshold, the receiving UE may allocate different resources other than the future resources 650, 680, and the receiving UE and / or the transmitting UE may use these different resources for any future sidelink communications.

[0081] The data, control information, and / or DMRS in the sidelink communication may be precoded, which may be performed by the transmitting UE. In one aspect, such precoding may be performed during beamforming for the transmitting UE (e.g., by applying a specific precoding matrix). For example, the precoding may be associated with the beam direction of the transmitting UE and may also be associated with the transmit power. If the precoding between the initial sidelink communication 610 and any of the future sidelink communications 640, 670 is changed, the interference on the future sidelink communications 640, 670 may be significantly different from the interference expected based on the power measurement associated with the initial SCI 612. In one example, the transmitting UE may use a specific precoder to precode the DMRS in the initial sidelink communication, and the receiving UE receiving the initial SCI may measure a low RSRP (e.g., below a threshold) on the DMRS associated with the initial SCI, and may thereby determine that these resources may be used for subsequent sidelink communications. In this example, if the transmitting UE uses a different precoder to precode the DMRS in subsequent sidelink communications, the resources expected to be available based on the low RSRP measurement during the initial sidelink communication may experience strong interference. Therefore, changing the precoder between sidelink communications may cause problems in resource allocation. Various aspects disclosed herein are directed to ensuring that the power (e.g., RSRP) measurements associated with the initial sidelink communication provide meaningful information about future sidelink communications.

[0082] According to some aspects of the present disclosure, it is contemplated that a transmitting UE may set constraints on future sidelink communications (e.g., 640, 670) to ensure that a receiving UE that receives an initial sidelink communication from the transmitting UE reliably senses the availability of resources for future sidelink communications (e.g., 640, 670) based on a power measurement of the initial sidelink communication (e.g., 610). Thus, the transmitting UE may apply a transmission constraint to the future sidelink communication, and may transmit the future sidelink communication based on the transmission constraint, wherein the transmission constraint may be based on a transmission characteristic associated with the transmission of the initial sidelink communication. The transmitting UE may be in Figure 1-4 , and the receiving UE may be a UE in one or more of Figure 1-4 Although the examples illustrated herein describe a transmitting UE transmitting sidelink communications to a receiving UE, the receiving UE may also be able to transmit sidelink communications to the transmitting UE.

[0083] Figure 7 is an example flow diagram illustrating sidelink communications between two user equipments according to some aspects. Figure 7, a transmitting UE 702 and a receiving UE 704 may communicate with each other via a side link. At 712, the transmitting UE 702 precodes data, control information (e.g., SCI), and / or DMRS associated with the initial side link communication. At 714, the transmitting UE 702 transmits the initial side link communication to the receiving UE 704. The initial side link communication may include an initial SCI including an indication of resources reserved for subsequent side link communications.

[0084] At 716, the receiving UE 704 may decode the initial SCI from the initial side link communication and determine the resources reserved for the subsequent side link communication based on the initial SCI. At 718, the receiving UE 704 may sense whether the resources reserved by the initial SCI are available for the subsequent side link communication. In one aspect, the receiving UE 704 may measure the power (e.g., RSRP) on the DMRS associated with the initial SCI received via the initial side link communication, and may sense whether the resources reserved by the initial SCI are available by sensing whether the power value according to the power measurement (e.g., RSRP measurement) exceeds the power threshold. If the power value according to the power measurement does not exceed the power threshold, the receiving UE 704 may utilize the resources reserved by the initial SCI for subsequent side link communication.

[0085] If the power value according to the power measurement exceeds the power threshold, the receiving UE 704 may reserve different resources for subsequent sidelink communications. In this case, the receiving UE 704 may use the reserved different resources to perform subsequent sidelink communications and may avoid using the resources reserved by the initial SCI. In one aspect, at 720, the receiving UE 704 may transmit resource information to the transmitting UE 706 to indicate that the resources reserved by the initial SCI are occupied and / or different resources are reserved for subsequent sidelink communications.

[0086] At 722, the transmitting UE 702 may apply transmission constraints to subsequent sidelink communications. In one aspect, the transmission constraints may be based on transmission characteristics associated with transmitting the initial sidelink communication. For example, the transmission constraints may be set so that the sensing results from the sensing at 718 may be consistent. Figure 7 The example in illustrates that the transmission constraints are applied after transmitting the initial side link communication. In another example, the transmission constraints can be applied before transmitting the initial side link communication and / or the initial transmission constraints can be applied to the initial side link communication before transmitting the initial side link communication.

[0087] At 724, the transmitting UE 702 precodes data, control information (eg, SCI), and / or DMRS associated with the initial sidelink communication. In an aspect, the transmitting UE 702 performs the precoding at 724 based on transmission constraints.

[0088] At 726, the transmitting UE 702 may transmit subsequent sidelink communications to the receiving UE 704 in accordance with the transmission constraints applied at 724. At 728, the receiving UE 704 receives and decodes the subsequent sidelink communications.

[0089] In an aspect, the transmission constraints may configure the transmitting UE to use the same precoder for all sidelink communications that are reserved and associated with the same SCI (e.g., where each of the sidelink communications 610, 640, 670 is transmitted with the same precoder). Thus, for example, the transmitting UE 702 may use the same precoder for an initial sidelink communication and subsequent sidelink communications transmitted on resources reserved by the initial SCI of the initial sidelink communication. For example, the same precoder identity may be set for all sidelink communications to configure the transmitting UE to use the same precoder for all sidelink communications.

[0090] As discussed above, each sidelink communication may include a control portion and a data portion, wherein the control portion may include an SCI. The control portion may include a PSCCH and the data portion may include a PSSCH. For example, as discussed above, the initial sidelink communication 610 may include a control portion transmitted via a control portion 622 of a resource 620, and may include a data portion transmitted via a non-control portion 624 of the resource 620. Before transmitting the sidelink communication, the transmitting UE may use a data precoder to precode the data portion of the sidelink communication, and may use a control precoder to precode the control portion of the sidelink communication. In one aspect, the transmitting UE 702 may use the same data precoder to precode the data portion of the initial sidelink communication and to precode the data portion of the subsequent sidelink communication. In one aspect, the transmitting UE 702 may use the same control precoder to precode the control portion of the initial sidelink communication and to precode the control portion of the subsequent sidelink communication. In an aspect, the transmitting UE 702 may use the same data precoder for precoding the data DMRS for the initial sidelink communication and for precoding the data DMRS for subsequent sidelink communications, and may use the same control precoder for precoding the control DMRS for the initial sidelink communication and for precoding the control DMRS for subsequent sidelink communications.

[0091] In one aspect, the transmission constraint may configure the transmitting UE to use the same reference signal port (e.g., DMRS port) for all sidelink communications that are reserved and associated with the same SCI (e.g., where each of the sidelink communications 610, 640, 670 is transmitted using the same DMRS port). For example, according to this transmission constraint, the same DMRS port(s) may be used for all sidelink communications, regardless of whether the same precoder or different precoders are used for the respective sidelink communications. Thus, for example, the transmitting UE 702 may use the same DMRS port(s) for an initial sidelink communication and subsequent sidelink communications transmitted on resources reserved by the initial SCI of the initial sidelink communication. Because transmission characteristics may be inferred from a particular DMRS port, utilizing the same DMRS port for all sidelink communications may ensure that all sidelink communications may be performed in a consistent manner.

[0092] In one aspect, the transmission constraints may cause the transmitting UE and / or the sensing UE to assume that the reference signal ports (e.g., DMRS ports) for sidelink transmissions that are reserved and associated with the same SCI are quasi co-located. If the properties of the channel on which the codewords on one antenna port are transmitted can be inferred from the channel on which the codewords on another antenna port are transmitted, the two antenna ports may be referred to as quasi co-located. For example, unless otherwise pre-configured, the transmitting UE and / or the receiving UE may be configured to assume that the DMRS ports used for initial sidelink transmission and subsequent sidelink transmissions are quasi co-located (QCL). For example, the reference signal ports for initial and subsequent sidelink transmissions may be QCL based on at least one of average gain, type A QCL (e.g., QCL based on Doppler shift, Doppler spread, average delay, and / or delay spread), type D QCL (e.g., QCL based on spatial Rx parameters), and / or spatial transmission filters. For example, according to this transmission constraint, a transmitting UE (e.g., transmitting UE 702) and / or a receiving UE (e.g., receiving UE 704) may be configured to assume QCLs of DMRS ports based on at least one of average gain, type A QCL, type D QCL, and / or spatial filters, regardless of whether the same precoder or different precoders are used for each side link communication, and regardless of whether the same DMRS port or different DMRS ports are used for each side link communication. Further, in one aspect, different numbers of DMRS ports may be set for different side link communications, as long as there is at least one common DMRS port between different side link communications. For example, when DMRS port #0 is set for an initial side link communication, and DMRS ports #0 and #1 are set for subsequent side link communications, a transmission characteristic may be inferred from DMRS port #0 and may be used for subsequent side link communications via DMRS port #1, even if DMRS port #0 is not used for subsequent side link communications.

[0093] In one aspect, the transmitting UE may apply the transmission constraint according to a preconfiguration. In one aspect, the preconfiguration may indicate whether the transmission constraint is to be enabled or disabled. In one aspect, the preconfiguration indicates which transmission constraint to use (e.g., out of the transmission constraints discussed above).

[0094] In one aspect, it is contemplated that the examples disclosed herein may be implemented to ensure that any transmission constraints on subsequent sidelink communications (e.g., the transmission constraints discussed above) are placed on a sidelink control transmission pair or a sidelink data transmission pair. In one aspect, constraints may not be placed on a pair of sidelink control transmissions and sidelink data transmissions. For example, transmission constraints on subsequent sidelink communications 640, 670 may be placed on a sidelink control transmission, where the receiving UE senses the transmitting UE based on RSRP measurements performed on the PSCCH for each of the subsequent sidelink communications 640, 670. Similarly, transmission constraints on subsequent sidelink communications 640, 670 may be placed on a sidelink data transmission, where the receiving UE senses the transmitting UE based on RSRP measurements performed on the PSSCH for each of the subsequent sidelink communications 640, 670.

[0095] Figure 8 is a block diagram illustrating an example of a hardware implementation for a wireless communication device 800 employing a processing system 814. For example, the wireless communication device 800 may be a UE as illustrated in any one or more of the figures disclosed herein.

[0096] The wireless communication device 800 may be implemented using a processing system 814 including one or more processors 804. Examples of the processor 804 include a microprocessor, a microcontroller, a digital signal processor (DSP), a field programmable gate array (FPGA), a programmable logic device (PLD), a state machine, a gated logic, a discrete hardware circuit, and other suitable hardware configured to perform the various functionalities described throughout this disclosure. In various examples, the wireless communication device 800 may be configured to perform any one or more of the functions described herein. That is, the processor 804 as utilized in the wireless communication device 800 may be used to implement the functions described below and in Figure 9-11 Any one or more of the processes and procedures explained in.

[0097] In this example, the processing system 814 can be implemented with a bus architecture generally represented by bus 802. Depending on the specific application and overall design constraints of the processing system 802, the bus 814 can include any number of interconnecting buses and bridges. The bus 802 communicatively couples various circuits including one or more processors (generally represented by processor 804), memory 805, and computer-readable media (generally represented by computer-readable storage media 806). The bus 802 can also link various other circuits, such as timing sources, peripherals, regulators, and power management circuits, which are well known in the art and therefore will not be described further. The bus interface 808 provides an interface between the bus 802 and the transceiver 810. The transceiver 810 provides a communication interface or device for communicating with various other equipment on a transmission medium. Depending on the characteristics of the equipment, a user interface 812 (e.g., a keypad, a display, a speaker, a microphone, a joystick) may also be provided.

[0098] The processor 804 is responsible for managing the bus 802 and general processing, including the execution of software stored on the computer-readable storage medium 806. The software, when executed by the processor 804, causes the processing system 814 to perform the various functions described below for any particular device. The computer-readable storage medium 806 and the memory 805 may also be used to store data manipulated by the processor 804 when executing the software.

[0099] One or more processors 804 in the processing system can execute software. Software should be broadly interpreted as meaning instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, encapsulation, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether it is described in software, firmware, middleware, microcode, hardware description language, or other terms. Software can reside on a computer-readable storage medium 806. Similar to the computer-readable storage medium 806, the computer-readable storage medium 806 can be a non-transient computer-readable storage medium including substantially similar characteristics. The computer-readable storage medium 806 can reside in the processing system 814, outside the processing system 814, or distributed across multiple entities including the processing system 814. It should also be appreciated that, similar to the computer-readable storage medium 806, the computer-readable storage medium 806 can be implemented in a computer program product including substantially similar characteristics.

[0100] In some aspects of the present disclosure, the processor 804 may include a circuit system configured for various functions. For example, the processor 804 may include an initial side link circuit system 840, which is configured for various functions, including, for example, transmitting an initial side link communication according to an initial precoder, wherein the initial side link communication includes an initial side link control information (SCI) transmission and a corresponding initial side link data transmission, and the initial SCI transmission includes an indication of resources reserved for subsequent side link communications. As illustrated, the processor 804 may also include a constraint circuit system 842 configured for various functions. For example, the constraint circuit system 842 may be configured to apply a transmission constraint to a subsequent side link communication, wherein the subsequent side link communication includes a subsequent SCI transmission and a corresponding subsequent side link data transmission, and the transmission constraint is based on a transmission characteristic associated with the transmission of the initial side link communication. The processor 804 may further include a subsequent side link circuit system 844, which is configured for various functions, including, for example, transmitting a subsequent side link communication according to the transmission constraint. It should also be appreciated that the combination of initial side link circuitry 840, constraint circuitry 842, and subsequent side link circuitry 844 may be configured to implement one or more functions described herein.

[0101] Various other aspects of the wireless communication device 800 are also contemplated. For example, it is contemplated that applying a transmission constraint may include constraining the selection of a subsequent precoder for precoding a subsequent side link communication. For example, the constraint may include using the same precoder for the initial precoder and the subsequent precoder for precoding the initial side link communication. It is also contemplated that the initial SCI transmission may further include an indication of resources reserved for additional subsequent side link communications, wherein the additional subsequent side link communications are transmitted using the same precoder. In one example, the initial precoder includes an initial control precoder for precoding a control portion of the initial side link communication and an initial data precoder for precoding a data portion of the initial side link communication, and the subsequent precoder includes a subsequent control precoder for precoding a control portion of the subsequent side link communication and a subsequent data precoder for precoding a data portion of the subsequent side link communication, wherein the constraint may include using the same control precoder for the initial control precoder and the subsequent control precoder and / or using the same data precoder for the initial data precoder and the subsequent data precoder.

[0102] In another aspect disclosed herein, it is contemplated that applying a transmission constraint may include transmitting each of an initial sidelink communication and a subsequent sidelink communication using the same reference signal port. Within such examples, the initial SCI transmission may further include an indication of resources reserved for additional subsequent sidelink communications, wherein the additional subsequent sidelink communications are transmitted using the same reference signal port.

[0103] In another aspect disclosed herein, it is contemplated that applying the transmission constraint may include quasi-co-location of reference signal ports used to transmit each of the initial side link communication and the subsequent side link communication. For example, unless otherwise pre-configured, each of the wireless communication device 800 and the corresponding sensing UE may be configured to assume the QCL of the DMRS port based on at least one of average gain, type A quasi-co-location (QCL) (e.g., QCL based on Doppler shift, Doppler spread, average delay, and / or delay spread), type D QCL (e.g., QCL based on spatial Rx parameters), and / or spatial transmission filters.

[0104] It should be appreciated that the wireless communication device 800 may be configured to ensure that constraints on subsequent sidelink communications are placed on either a pair of sidelink control transmissions or a pair of sidelink data transmissions, but not on a pair of one of each. For example, transmitting subsequent sidelink communications may include applying transmission constraints to each of an initial SCI transmission and a subsequent SCI transmission, wherein the sensing UE senses the wireless communication device 800 based on an RSRP measurement performed on the PSCCH for each subsequent sidelink communication. Similarly, transmitting subsequent sidelink communications may include applying transmission constraints to each of an initial sidelink data transmission and a subsequent sidelink data transmission, wherein the sensing UE senses the wireless communication device 800 based on an RSRP measurement performed on the PSSCH for each subsequent sidelink communication.

[0105] In one aspect disclosed herein, the transmission constraint may be applied according to a preconfiguration. For example, the preconfiguration may include an indication to enable or disable the transmission constraint and / or an indication to select the transmission constraint from among a plurality of transmission constraints.

[0106] In one or more examples, the computer-readable storage medium 806 may include initial side link software 852, which is configured for various functions, including, for example, transmitting initial side link communications according to an initial precoder, wherein the initial side link communications include an initial SCI transmission and a corresponding initial side link data transmission, and wherein the initial SCI transmission includes an indication of resources reserved for subsequent side link communications. As illustrated, the computer-readable storage medium 806 may also include constraint software 854 configured for various functions. For example, the constraint software 854 may be configured to apply transmission constraints to subsequent side link communications, wherein the subsequent side link communications include subsequent SCI transmissions and corresponding subsequent side link data transmissions, and wherein the transmission constraints are based on transmission characteristics associated with the transmission of the initial side link communications. The computer-readable storage medium 806 may further include subsequent side link software 856, which is configured for various functions, including, for example, transmitting subsequent side link communications according to transmission constraints. It should also be appreciated that the combination of the initial side link software 852, the constraint software 854, and the subsequent side link software 856 may be configured to implement one or more functions described herein.

[0107] In a particular configuration, it is also contemplated that the wireless communication device 800 includes means for transmitting an initial sidelink communication; means for applying a transmission constraint to a subsequent sidelink communication, and means for transmitting a subsequent sidelink communication. In one aspect, the aforementioned means may be the processor(s) 804 configured to perform the functions recited by the aforementioned means. In another aspect, the aforementioned means may be a circuit or any equipment configured to perform the functions recited by the aforementioned means.

[0108] Of course, in the above examples, the circuit system included in the processor 804 is provided only as an example, and other means for performing the described functions may be included in various aspects of the present disclosure, including but not limited to instructions stored in the computer-readable storage medium 806, or described herein and using, for example, Fig. 9 Any other suitable apparatus or device for implementing the described processes and / or algorithms.

[0109] exist Fig. 9 In the present disclosure, a flowchart is provided that illustrates an exemplary wireless communication device process for performing some aspects of the present disclosure. As described below, some or all of the illustrated features may be omitted in certain implementations within the scope of the present disclosure, and some of the illustrated features may not be required to implement all examples. In some examples, process 900 may be performed by Figure 8 In some examples, process 900 may be performed by any suitable equipment or device for performing the functions or algorithms described below.

[0110] Process 900 begins at block 910 with the wireless communication device 800 transmitting an initial sidelink communication, wherein the initial SCI transmission includes an indication of resources reserved for subsequent sidelink communications. Figure 8 The initial side link circuitry 840 shown and described may provide a means for transmitting initial side link communications.

[0111] At block 920, process 900 continues with the wireless communication device 800 applying a transmission constraint to a subsequent sidelink communication, wherein the transmission constraint is based on a transmission characteristic associated with transmitting the initial sidelink communication. Figure 8 Constraint circuitry 842 is shown and described as providing a means for applying transmission restrictions.

[0112] In an aspect, applying the transmission constraint at block 920 may include constraining selection of a subsequent precoder for precoding subsequent sidelink communications. In an aspect, the constraint may include using the same precoder for an initial precoder and a subsequent precoder for precoding the initial sidelink communications. In an aspect, the initial SCI transmission may further include an indication of resources reserved for additional subsequent sidelink communications, and wherein the additional subsequent sidelink communications are transmitted using the same precoder.

[0113] In one aspect, the initial precoder may include an initial control precoder for precoding a control portion of the initial sidelink communication and an initial data precoder for precoding a data portion of the initial sidelink communication, and the subsequent precoders include a subsequent control precoder for precoding a control portion of the subsequent sidelink communication and a subsequent data precoder for precoding a data portion of the subsequent sidelink communication. In this aspect, the constraints may include at least one of: using the same control precoder for the initial control precoder and the subsequent control precoder, or using the same data precoder for the initial data precoder and the subsequent data precoder.

[0114] In an aspect, applying the transmission constraints at block 920 may include transmitting each of the initial sidelink communication and the subsequent sidelink communication using the same reference signal port. In an aspect, the initial SCI transmission may further include an indication of resources reserved for additional subsequent sidelink communications, wherein the additional subsequent sidelink communications may be transmitted using the same reference signal port.

[0115] In an aspect, applying the transmission constraints at block 920 may include quasi-co-locating reference signal ports used to transmit each of the initial sidelink communication and the subsequent sidelink communication. In an aspect, the reference signal ports may be quasi-co-located based on at least one of average gain, type A quasi-co-location, type D quasi-co-location, and / or a spatial transmission filter.

[0116] In an aspect, the transmission constraint may be applied according to a preconfiguration at 920. In an aspect, the preconfiguration may include at least one of an indication that the transmission constraint is to be enabled or disabled, and / or an indication that the transmission constraint is to be selected from among a plurality of transmission constraints.

[0117] Process 900 then ends at block 903 with the wireless communication device 800 transmitting subsequent sidelink communications in accordance with the transmission constraints. Figure 8 The subsequent sidelink circuitry 844 shown and described may provide means for transmitting subsequent sidelink communications.In an aspect, transmitting the subsequent sidelink communication at block 930 may include applying a transmission constraint to each of the initial SCI transmission and the subsequent SCI transmission.

[0118] In one configuration, the wireless communication device 800 for wireless communication includes: means for transmitting an initial sidelink communication, wherein the initial SCI transmission includes an indication of resources reserved for subsequent sidelink communications; means for applying a transmission constraint to the subsequent sidelink communication, wherein the transmission constraint is based on a transmission characteristic associated with transmitting the initial sidelink communication; and means for transmitting the subsequent sidelink communication in accordance with the transmission constraint. In one aspect, the foregoing means may be Figure 8 The processor(s) 804 shown in , which is configured to perform the functions recited by the aforementioned means. On the other hand, the aforementioned means may be a circuit or any equipment configured to perform the functions recited by the aforementioned means.

[0119] Of course, in the above examples, the circuit system included in the processor 804 is provided only as an example, and other means for performing the described functions may be included in various aspects of the present disclosure, including but not limited to instructions stored in the computer-readable storage medium 806, or in Figure 1-4 and 7 and using, for example, the present invention with respect to Fig. 9 , 10 and / or any other suitable equipment or means for implementing the processes and / or algorithms described in 11.

[0120] exist Fig.10 In the present disclosure, a flowchart is provided that illustrates an exemplary wireless communication device process for performing some aspects of the present disclosure. As described below, some or all of the illustrated features may be omitted in certain implementations within the scope of the present disclosure, and some of the illustrated features may not be required to implement all examples. In some examples, process 1000 may be performed by Figure 8 In some examples, process 1000 may be performed by any suitable equipment or means for performing the functions or algorithms described below.

[0121] Process 1000 begins at block 1010, where the wireless communication device 800 precodes initial sidelink communications. Figure 8 The initial side link circuitry 840 shown and described may provide means for precoding initial side link communications.

[0122] At block 1020, process 1000 continues with transmitting an initial sidelink communication by wireless communication device 800, wherein the initial SCI transmission includes an indication of resources reserved for subsequent sidelink communications. Figure 8 The initial side link circuitry 840 shown and described may provide a means for transmitting initial side link communications.

[0123] At block 1030, process 1000 further continues with wireless communication device 800 applying transmission constraints to subsequent sidelink communications by using the same precoder for an initial precoder for precoding the initial sidelink communications and a subsequent precoder for precoding the subsequent sidelink communications. Figure 8 Constraint circuitry 842 is shown and described as providing a means for applying transmission restrictions.

[0124] At block 1040, the process 1000 further continues with the wireless communication device 800 precoding subsequent sidelink communications based on the transmission constraints. Figure 8 The subsequent sidelink circuitry 844 shown and described may provide a means for precoding subsequent sidelink communications.

[0125] Process 1000 then ends at block 1050 with the wireless communication device 800 transmitting subsequent sidelink communications in accordance with the transmission constraints. Figure 8 The subsequent sidelink circuitry 844 shown and described may provide a means for transmitting subsequent sidelink communications.

[0126] In one configuration, a wireless communication device 800 for wireless communication includes means for precoding an initial sidelink communication; means for transmitting the initial sidelink communication, wherein the initial sidelink control information (SCI) transmission includes an indication of resources reserved for subsequent sidelink communications; means for applying a transmission constraint to the subsequent sidelink communication that uses the same precoder for an initial precoder used to precode the initial sidelink communication and a subsequent precoder used to precode the subsequent sidelink communication; means for precoding the subsequent sidelink communication based on the transmission constraint; and means for transmitting the subsequent sidelink communication in accordance with the transmission constraint. In one aspect, the foregoing means may be Figure 8The processor(s) 804 shown in , which is configured to perform the functions recited by the aforementioned means. On the other hand, the aforementioned means may be a circuit or any equipment configured to perform the functions recited by the aforementioned means.

[0127] Of course, in the above examples, the circuit system included in the processor 804 is provided only as an example, and other means for performing the described functions may be included in various aspects of the present disclosure, including but not limited to instructions stored in the computer-readable storage medium 806, or in Figure 1-4 and 7 and using, for example, the present invention with respect to Fig. 9 , 10 and / or any other suitable equipment or means for implementing the processes and / or algorithms described in 11.

[0128] exist Fig.11 In the present disclosure, a flowchart is provided that illustrates an exemplary wireless communication device process for performing some aspects of the present disclosure. As described below, some or all of the illustrated features may be omitted in certain implementations within the scope of the present disclosure, and some of the illustrated features may not be required to implement all examples. In some examples, process 1100 may be performed by Figure 8 In some examples, process 1100 may be performed by any suitable equipment or device for performing the functions or algorithms described below.

[0129] Process 1100 begins at block 1110 by wireless communication device 800 precoding the data portion and control portion of an initial sidelink communication. Figure 8 The initial side link circuitry 840 shown and described may provide a means for precoding the data portion and the control portion of the initial side link communications.

[0130] At block 1120, process 1100 continues with the wireless communication device 800 transmitting an initial sidelink communication, wherein the initial SCI transmission includes an indication of resources reserved for subsequent sidelink communications. Figure 8 The initial side link circuitry 840 shown and described may provide a means for transmitting initial side link communications.

[0131] At block 1130, process 1100 further continues with wireless communication device 800 precoding the data portion of subsequent sidelink communications using the same data precoder as used to precode the data portion of the initial sidelink communications, and / or precoding the control portion of subsequent sidelink communications using the same control precoder as used to precode the control portion of the initial sidelink communications. Figure 8The constraint circuitry 842 shown and described may provide a means for precoding the data portion and / or the control portion of subsequent sidelink communications.

[0132] Process 1100 then ends at block 1140 with the wireless communication device 800 transmitting subsequent sidelink communications in accordance with the transmission constraints. Figure 8 The subsequent sidelink circuitry 844 shown and described may provide a means for transmitting subsequent sidelink communications.

[0133] In one configuration, a wireless communication device 800 for wireless communication includes means for precoding a data portion and a control portion of an initial sidelink communication; means for transmitting the initial sidelink communication, wherein the initial SCI transmission includes an indication of resources reserved for subsequent sidelink communications; means for precoding the data portion of the subsequent sidelink communication using the same data precoder used to precode the data portion of the initial sidelink communication and / or precoding the control portion of the subsequent sidelink communication using the same control precoder used to precode the control portion of the initial sidelink communication; and means for transmitting the subsequent sidelink communication in accordance with the transmission constraints. In one aspect, the foregoing means may be Figure 8 The processor(s) 804 shown in , which is configured to perform the functions recited by the aforementioned means. On the other hand, the aforementioned means may be a circuit or any equipment configured to perform the functions recited by the aforementioned means.

[0134] Of course, in the above examples, the circuit system included in the processor 804 is provided only as an example, and other means for performing the described functions may be included in various aspects of the present disclosure, including but not limited to instructions stored in the computer-readable storage medium 806, or in Figure 1-4 and 7 and using, for example, the present invention with respect to Fig. 9 , 10 and / or any other suitable equipment or means for implementing the processes and / or algorithms described in 11.

[0135] Several aspects of wireless communication networks have been presented with reference to exemplary implementations. As those skilled in the art will readily appreciate, the various aspects described throughout this disclosure may be extended to other telecommunication systems, network architectures and communication standards.

[0136] As an example, various aspects may be implemented within other systems defined by 3GPP, such as Long Term Evolution (LTE), Evolved Packet System (EPS), Universal Mobile Telecommunications System (UMTS), and / or Global System for Mobile (GSM). Various aspects may also be extended to systems defined by the Third Generation Partnership Project 2 (3GPP2), such as CDMA2000 and / or Evolution Data Optimized (EV-DO). Other examples may be implemented within systems employing IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Ultra Wideband (UWB), Bluetooth, and / or other suitable systems. The actual telecommunication standard, network architecture, and / or communication standard employed will depend on the specific application and the overall design constraints imposed on the system.

[0137] Within the present disclosure, the wording "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 superior or superior to other aspects of the present disclosure. Likewise, the term "aspect" does not require that all aspects of the present disclosure include the features, advantages, or modes of operation discussed. The term "coupled" is used herein to refer to a direct or indirect coupling between two objects. For example, if object A physically contacts object B, and object B contacts object C, objects A and C 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 never directly contacts the second object physically. The terms "circuit" and "circuitry" are used broadly and are intended to include both hardware implementations of electronic devices and conductors and software implementations of information and instructions, which, when connected and configured, enable the functions described in the present disclosure to be performed without limitation on the type of electronic circuits, which, when executed by a processor, enable the functions described in the present disclosure to be performed.

[0138] Figure 1-11 One or more of the components, steps, features, and / or functions described herein may be rearranged and / or combined into a single component, step, feature, or function, or implemented 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 1-8 The apparatus, devices and / or components illustrated in the can be configured to perform one or more methods, features, or steps described herein. The novel algorithms described herein can also be efficiently implemented in software and / or embedded in hardware.

[0139] It should be understood that the specific order or hierarchy of steps in the disclosed methods is an illustration of an exemplary process. Based on design preferences, it should be understood that the specific order or hierarchy of steps in these methods can be rearranged. The attached method claims present elements of the various steps in a sample order and are not meant to be limited to the specific order or hierarchy presented unless specifically stated herein.

[0140] The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the universal principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the various aspects shown herein, but should be granted the full scope consistent with the language of the claims, wherein the singular reference to the element is not intended to mean "there is and only one" - unless specifically stated, but intended to mean "one or more". Unless specifically stated otherwise, the term "some / some" refers to one or more. The phrase "at least one" of a list of items refers to any combination of these items, including a single member. As an 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. The elements of the various aspects described throughout this disclosure are all structurally and functionally equivalent schemes currently or hereafter known to those of ordinary skill in the art, and are expressly incorporated herein by reference, and are intended to be covered by the claims. In addition, nothing disclosed herein is intended to be donated to the public, regardless of whether such disclosure is explicitly recorded in the claims.

Claims

1. A wireless communication method, comprising: transmitting an initial sidelink communication, wherein an initial sidelink control information (SCI) transmission in the initial sidelink communication includes an indication of resources reserved for subsequent sidelink communications; applying transmission constraints to the subsequent sidelink communications including subsequent SCI transmissions, wherein the transmission constraints are based on transmission characteristics associated with transmitting the initial sidelink communications; and transmitting the subsequent sidelink communication in accordance with the transmission constraints, Wherein applying the transmission constraints comprises constraining selection of a subsequent precoder for precoding the subsequent sidelink communication based on an initial precoder used to precode the initial sidelink communication.

2. The method of claim 1, wherein the constraint comprises using the same precoder for the initial precoder and the subsequent precoder for precoding the initial sidelink communication.

3. The method of claim 2, wherein the initial SCI transmission further comprises an indication of resources reserved for additional subsequent sidelink communications, and wherein the additional subsequent sidelink communications are transmitted using the same precoder.

4. The method of claim 1 , wherein the initial precoder for precoding the initial sidelink communication comprises an initial control precoder for precoding a control portion of the initial sidelink communication and an initial data precoder for precoding a data portion of the initial sidelink communication, and the subsequent precoders comprise a subsequent control precoder for precoding a control portion of the subsequent sidelink communication and a subsequent data precoder for precoding a data portion of the subsequent sidelink communication, and in, The constraints include at least one of the following: using the same control precoder for the initial control precoder and the subsequent control precoder, or The same data precoder is used for the initial data precoder and the subsequent data precoder.

5. The method of claim 1, wherein applying the transmission constraints comprises transmitting each of the initial sidelink communication and the subsequent sidelink communication using a same reference signal port.

6. The method of claim 5, wherein the initial SCI transmission further comprises an indication of resources reserved for additional subsequent sidelink communications, and wherein the additional subsequent sidelink communications are transmitted using the same reference signal port.

7. The method of claim 1, wherein applying the transmission constraints comprises quasi-co-locating reference signal ports used to transmit each of the initial sidelink communication and the subsequent sidelink communication.

8. The method of claim 7, wherein the reference signal ports are quasi-colocated based on at least one of average gain, type A quasi-colocation, type D quasi-colocation, or a spatial transmission filter.

9. The method of claim 1, wherein transmitting the subsequent sidelink communication comprises applying the transmission constraints to each of the initial SCI transmission and the subsequent SCI transmission.

10. The method of claim 1, wherein transmitting the subsequent sidelink communication comprises applying the transmission constraint to each of an initial sidelink data transmission and a subsequent sidelink data transmission. The method of claim 1 , wherein the transmission constraints are applied according to a preconfiguration.

12. The method of claim 11, wherein: The pre-configuration includes at least one of the following: an indication of whether to enable or disable the transfer constraint, or An indication that the transfer constraint is to be selected from among a plurality of transfer constraints.

13. A wireless communication device, comprising: Transceiver; Memory; as well as at least one processor coupled to the transceiver and the memory, wherein the at least one processor is configured to cause the wireless communication device to: transmitting an initial sidelink communication, wherein an initial sidelink control information (SCI) transmission in the initial sidelink communication includes an indication of resources reserved for subsequent sidelink communications; applying transmission constraints to the subsequent sidelink communications including subsequent SCI transmissions, wherein the transmission constraints are based on transmission characteristics associated with transmitting the initial sidelink communications; and transmitting the subsequent sidelink communication in accordance with the transmission constraints, Wherein, to apply the transmission constraint, the at least one processor is configured to cause the wireless communication device to constrain selection of a subsequent precoder for precoding the subsequent sidelink communication based on an initial precoder for precoding the initial sidelink communication.

14. The wireless communication device of claim 13, wherein the at least one processor is further configured to cause the wireless communication device to use the same precoder for the initial precoder and the subsequent precoder for precoding the initial sidelink communication.

15. The wireless communication device of claim 14, wherein the initial SCI transmission further comprises an indication of resources reserved for additional subsequent sidelink communications, and wherein the additional subsequent sidelink communications are transmitted using the same precoder.

16. The wireless communication device of claim 13, wherein the initial precoder for precoding the initial sidelink communication comprises an initial control precoder for precoding a control portion of the initial sidelink communication and an initial data precoder for precoding a data portion of the initial sidelink communication, and the subsequent precoder comprises a subsequent control precoder for precoding a control portion of the subsequent sidelink communication and a subsequent data precoder for precoding a data portion of the subsequent sidelink communication, and in, The at least one processor is further configured to cause the wireless communication device to at least one of: using the same control precoder for the initial control precoder and the subsequent control precoder, or The same data precoder is used for the initial data precoder and the subsequent data precoder.

17. The wireless communication device of claim 13, wherein: To apply the transmission constraint, the at least one processor is configured to cause the wireless communication device to transmit each of the initial sidelink communication and the subsequent sidelink communication using a same reference signal port.

18. The wireless communication device of claim 17, wherein the initial SCI transmission further comprises an indication of resources reserved for additional subsequent sidelink communications, and wherein the additional subsequent sidelink communications are transmitted using the same reference signal port.

19. The wireless communication device of claim 13, wherein: To apply the transmission constraint, the at least one processor is further configured to cause the wireless communication device to quasi-co-locate reference signal ports used to transmit each of the initial sidelink communication and the subsequent sidelink communication.

20. The wireless communication device of claim 19, wherein the reference signal ports are quasi-colocated based on at least one of average gain, Type A quasi-colocation, Type D quasi-colocation, and / or a spatial transmission filter.

21. The wireless communication device of claim 13, wherein: To transmit the subsequent sidelink communication, the at least one processor is further configured to cause the wireless communication device to apply the transmission constraint to each of the initial SCI transmission and the subsequent SCI transmission.

22. The wireless communication device of claim 13, wherein: To transmit the subsequent sidelink communication, the at least one processor is further configured to cause the wireless communication device to apply the transmission constraint to each of an initial sidelink data transmission and a subsequent sidelink data transmission.

23. The wireless communication device of claim 13, wherein the transmission constraints are applied according to a preconfiguration.

24. The wireless communication device of claim 23, wherein the pre-configuration comprises at least one of: an indication of whether to enable or disable the transfer constraint, or An indication that the transfer constraint is to be selected from among a plurality of transfer constraints.

25. A wireless communication device for wireless communication, comprising: means for transmitting an initial sidelink communication, wherein an initial sidelink control information (SCI) transmission in the initial sidelink communication includes an indication of resources reserved for subsequent sidelink communications; means for applying transmission constraints to the subsequent sidelink communications including subsequent SCI transmissions, wherein the transmission constraints are based on transmission characteristics associated with transmitting the initial sidelink communications; and means for transmitting the subsequent sidelink communication in accordance with the transmission constraint, Wherein the means for applying the transmission constraints is configured to constrain selection of a subsequent precoder used to precode the subsequent sidelink communication based on an initial precoder used to precode the initial sidelink communication.

26. The wireless communication device of claim 25, wherein the means for applying the transmission constraints is further configured to use the same precoder for the initial precoder and the subsequent precoder for precoding the initial sidelink communication.

27. The wireless communication device of claim 26, wherein the initial SCI transmission further comprises an indication of resources reserved for additional subsequent sidelink communications, and wherein the additional subsequent sidelink communications are transmitted using the same precoder.

28. The wireless communication device of claim 25, wherein the initial precoder for precoding the initial sidelink communication comprises an initial control precoder for precoding a control portion of the initial sidelink communication and an initial data precoder for precoding a data portion of the initial sidelink communication, and the subsequent precoders comprise a subsequent control precoder for precoding a control portion of the subsequent sidelink communication and a subsequent data precoder for precoding a data portion of the subsequent sidelink communication, and Wherein the means for applying the transmission constraint is further configured to perform at least one of the following: using the same control precoder for the initial control precoder and the subsequent control precoder, or The same data precoder is used for the initial data precoder and the subsequent data precoder.

29. The wireless communication apparatus of claim 25, wherein the means for applying the transmission constraints is further configured to transmit each of the initial sidelink communication and the subsequent sidelink communication using a same reference signal port.

30. The wireless communication device of claim 29, wherein the initial SCI transmission further comprises an indication of resources reserved for additional subsequent sidelink communications, and wherein the additional subsequent sidelink communications are transmitted using the same reference signal port.

31. The wireless communication apparatus of claim 25, wherein the means for applying the transmission constraint is further configured to quasi-co-locate reference signal ports used to transmit each of the initial sidelink communication and the subsequent sidelink communication.

32. The wireless communication device of claim 31, wherein the reference signal ports are quasi-colocated based on at least one of average gain, Type A quasi-colocation, Type D quasi-colocation, and / or a spatial transmission filter.

33. The wireless communication apparatus of claim 25, wherein the means for transmitting the subsequent sidelink communication is further configured to apply the transmission constraint to each of the initial SCI transmission and the subsequent SCI transmission.

34. The wireless communication apparatus of claim 25, wherein the means for transmitting the subsequent sidelink communication is further configured to apply the transmission constraint to each of an initial sidelink data transmission and a subsequent sidelink data transmission.

35. The wireless communication device of claim 25, wherein the transmission constraints are applied according to a preconfiguration.

36. The wireless communication device of claim 35, wherein the pre-configuration comprises at least one of: an indication of whether to enable or disable the transfer constraint, or An indication that the transfer constraint is to be selected from among a plurality of transfer constraints.

37. A non-transitory computer-readable storage medium having instructions thereon for a wireless communication device, wherein the instructions, when executed by a processing circuit, cause the processing circuit to: transmitting an initial side link communication, wherein The transmission of initial sidelink control information SCI in the initial sidelink communication includes an indication of resources reserved for subsequent sidelink communications; applying transmission constraints to the subsequent sidelink communications including subsequent SCI transmissions, wherein the transmission constraints are based on transmission characteristics associated with transmitting the initial sidelink communications; as well as transmitting the subsequent sidelink communication in accordance with the transmission constraints, Wherein the instructions for causing the processing circuit to apply the transmission constraints are configured to cause the processing circuit to constrain selection of a subsequent precoder for precoding the subsequent sidelink communication based on an initial precoder for precoding the initial sidelink communication.

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