Transmission Power Adjustment for Vehicles with Multiple Transmission and Reception Points

Abstract

In some aspects of the present disclosure, a method of wireless communication includes: performing a first wireless transmission using a plurality of transmit and receive points (TRPs) of a vehicle. The first wireless transmission is performed based on a first transmit power allocation among the plurality of TRPs. The method further includes: in response to the first wireless transmission, receiving one or more feedback signals for indicating a reception status of the first wireless transmission at one or more devices. The method further includes: performing a second wireless transmission using the plurality of TRPs based on a second transmit power allocation among the plurality of TRPs. The second transmit power allocation is determined based on at least one received signal strength of the one or more feedback signals.

Description

Technical Field

[0001] Broadly speaking, aspects of the present disclosure relate to wireless communication systems, and more particularly, aspects of the present disclosure relate to vehicles that transmit signals within a wireless communication system using transmit and receive points (TRPs). Background Art

[0002] Wireless communication networks are widely deployed to provide various communication services such as voice, video, packet data, messaging, broadcasting, etc. These wireless networks can be multi-access networks capable of supporting multiple users by sharing available network resources. Such networks, which are typically multi-access networks, support communication for multiple users by sharing available network resources.

[0003] A wireless communication network may include multiple base stations or Node Bs capable of supporting communication for multiple user equipments (UEs). The UEs may communicate with the base stations via a downlink and an uplink. The downlink (or forward link) refers to the communication link from the base station to the UE, and the uplink (or reverse link) refers to the communication link from the UE to the base station.

[0004] The base station may send data and control information to the UE on the downlink, and / or may receive data and control information from the UE on the uplink. On the downlink, transmissions from the base station may encounter interference due to transmissions from neighboring base stations or from other radio frequency (RF) transmitters. On the uplink, transmissions from the UE may encounter interference from uplink transmissions of other UEs communicating with neighboring base stations or from other radio RF transmitters. Such interference may degrade the performance on both the downlink and the uplink.

[0005] As the demand for mobile broadband access continues to grow, the likelihood of interfering with and congesting the network increases as more UEs access long-distance wireless communication networks and more short-distance wireless systems are deployed in the community. Research and development continue to drive the development of wireless technologies, not only to meet the growing demand for mobile broadband access, but also to enhance and improve the user experience of mobile communications. Summary of the Invention

[0006] In one aspect of the present disclosure, a method of wireless communication includes: performing a first wireless transmission using a plurality of transmit and receive points (TRPs) of a vehicle. The first wireless transmission is performed based on a first transmit power allocation among the plurality of TRPs. The method further includes: receiving, in response to the first wireless transmission, one or more feedback signals for indicating a reception status of the first wireless transmission at one or more devices. The method further includes: performing a second wireless transmission using the plurality of TRPs based on a second transmit power allocation among the plurality of TRPs. The second transmit power allocation is determined based on at least one received signal strength of the one or more feedback signals.

[0007] In some other aspects, an apparatus includes a memory and one or more processors coupled to the memory. The one or more processors are configured to: perform a first wireless transmission using the plurality of TRPs of a vehicle based on a first transmit power allocation among the plurality of TRPs. The one or more processors are further configured to: receive, in response to the first wireless transmission, one or more feedback signals for indicating a reception status of the first wireless transmission at one or more devices. The one or more processors are further configured to: perform a second wireless transmission using the plurality of TRPs based on a second transmit power allocation among the plurality of TRPs. The second transmit power allocation is determined based on at least one received signal strength of the one or more feedback signals.

[0008] In some other aspects, an apparatus includes: a unit for performing a first wireless transmission using a plurality of TRPs of a vehicle. The first wireless transmission is performed based on a first transmit power allocation among the plurality of TRPs. The apparatus further includes: a unit for receiving, in response to the first wireless transmission, one or more feedback signals for indicating a reception status of the first wireless transmission at one or more devices. The apparatus further includes: a unit for performing a second wireless transmission using the plurality of TRPs based on a second transmit power allocation among the plurality of TRPs, wherein the second transmit power allocation is determined based on at least one received signal strength of the one or more feedback signals.

[0009] In some other aspects, a non-transitory computer-readable medium stores instructions executable by a processor to perform operations. The operations include: performing a first wireless transmission using a plurality of transmit receive points (TRPs) of a vehicle. The first wireless transmission is performed based on a first transmit power allocation among the plurality of TRPs. The operations further include: in response to the first wireless transmission, receiving one or more feedback signals for indicating a reception status of the first wireless transmission at one or more devices. The operations further include: performing a second wireless transmission using the plurality of TRPs based on a second transmit power allocation among the plurality of TRPs. The second transmit power allocation is determined based on at least a received signal strength of the one or more feedback signals.

[0010] In some other aspects, a method of wireless communication includes: receiving, by a device, a first wireless transmission performed by a plurality of TRPs of a vehicle based on a first transmit power allocation among the plurality of TRPs. The method further includes: in response to the first wireless transmission, sending a feedback signal for indicating a reception status of the first wireless transmission at the device. The method further includes: receiving, by the device, a second wireless transmission performed by the plurality of TRPs based on a second transmit power allocation among the plurality of TRPs. The second transmit power allocation is based on a received signal strength of the feedback signal.

[0011] In some other aspects, a device includes a memory and one or more processors coupled to the memory. The one or more processors are configured to: receive a first wireless transmission performed by a plurality of TRPs of a vehicle based on a first transmit power allocation among the plurality of TRPs. The one or more processors are further configured to: in response to the first wireless transmission, send a feedback signal for indicating a reception status of the first wireless transmission. The one or more processors are further configured to: receive a second wireless transmission performed by the plurality of TRPs based on a second transmit power allocation among the plurality of TRPs. The second transmit power allocation is based on a received signal strength of the feedback signal.

[0012] In some other aspects, a device includes: means for receiving a first wireless transmission performed by a plurality of TRPs of a vehicle based on a first transmit power allocation among the plurality of TRPs. The device further includes: means for, in response to the first wireless transmission, sending a feedback signal for indicating a reception status of the first wireless transmission. The device further includes: means for receiving a second wireless transmission performed by the plurality of TRPs based on a second transmit power allocation among the plurality of TRPs. The second transmit power allocation is based on a received signal strength of the feedback signal.

[0013] In some other aspects, a non-transitory computer-readable medium stores instructions executable by a processor to perform operations. The operations include: receiving, by a device, a first wireless transmission performed by a plurality of transmit receive points (TRPs) of a vehicle based on a first transmit power allocation among the plurality of TRPs. The operations further include: in response to the first wireless transmission, sending a feedback signal for indicating a reception status of the first wireless transmission at the device. The operations further include: receiving, by the device, a second wireless transmission performed by the plurality of TRPs based on a second transmit power allocation among the plurality of TRPs. The second transmit power allocation is based on a received signal strength of the feedback signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] A further understanding of the nature and advantages of the present disclosure can be realized by reference to the following drawings. In the drawings, like components or features may have the same reference numerals. Further, various components of the same type may be distinguished by following the reference numeral with a dash and a second numeral, the second numeral being used to distinguish among similar components. If only the first reference numeral is used in the specification, the description applies to any one of the similar components having the same first reference numeral, regardless of the second reference numeral.

[0015] Figure 1 is a block diagram illustrating an example of a wireless communication system in accordance with some aspects of the present disclosure.

[0016] Figure 2 is a block diagram illustrating an example of a base station and a UE in accordance with some aspects of the present disclosure.

[0017] Figure 3 is a block diagram illustrating another example of a wireless communication system in accordance with some aspects of the present disclosure.

[0018] Figure 4 is a diagram illustrating an example of transmit power adjustment in accordance with some aspects of the present disclosure.

[0019] Figure 5 is a flowchart of a method of wireless communication in accordance with some aspects of the present disclosure.

[0020] Figure 6 is a flowchart of another method of wireless communication in accordance with some aspects of the present disclosure.

[0021] Figure 7 is a block diagram illustrating an example of a UE in accordance with some aspects of the present disclosure.

[0022] The appendix provides further details regarding various aspects of the present disclosure, and the subject matter therein forms a part of the specification of this application. Detailed implementation manners

[0023] Vehicles are increasingly using wireless communication to send and receive data. For example, a vehicle can use a "vehicle-to-everything" (V2X) wireless communication protocol to send and receive vehicle safety information, such as to indicate an approaching emergency vehicle or provide a collision warning, as illustrative examples. A particular type of V2X wireless communication protocol is the cellular V2X (C-V2X) communication protocol, which uses cellular communication between a user equipment (UE) (e.g., a vehicle) and other devices (such as other vehicles, pedestrian devices, roadside units (RSUs), and other devices). Thus, V2X and C-V2X communication technologies have the ability to significantly improve road safety.

[0024] To enable communication between a vehicle and other devices, the vehicle can use one or more techniques to reserve resources of a wireless communication channel to avoid resource conflicts with other transmitting devices. By way of illustration, after reserving resources, the vehicle can use the resources to transmit a wireless communication signal, and other devices can avoid using the resources while the reservation is valid (e.g., until the reservation "expires"). In some wireless communication protocols, the vehicle also indicates a transmit power setting (such as a transmit configuration indicator (TCI) state) while reserving resources.

[0025] In some wireless communication protocols, the vehicle can use the same transmit power setting for communication during a reservation. For example, the transmit power can be based on a reference signal (such as a demodulation reference signal (DMRS)), and the vehicle can receive one reference signal each time a reservation is made. Thus, the vehicle may not be able to change the transmit power setting during the reservation. In some cases, it may be advantageous to change the transmit power setting during the reservation, for example, if the vehicle leaves the receiver device after the reservation and before the reservation expires.

[0026] Techniques according to some aspects of the present disclosure use the received signal strength of a feedback signal to adjust the transmit power setting of a vehicle. The transmit power setting can correspond to the power allocation between the transmit and receive points (TRP) of the vehicle. By way of illustration, a first wireless transmission performed by the vehicle can include the reservation of one or more time-frequency resources and can be performed based on a first transmit power allocation between the TRPs (e.g., a first TCI state) (e.g., where one TRP is allocated fifty percent of the total transmit power and where the other TRP is allocated fifty percent of the total transmit power). The vehicle can receive one or more feedback signals from one or more devices, for example, by receiving an acknowledgment (ACK) of the first wireless transmission, a negative acknowledgment (NACK) of the first wireless transmission, or both.

[0027] A vehicle can determine the received signal strength of one or more feedback signals. For example, the received signal strength can correspond to the reference signal strength indicator (RSSI) of one or more feedback signals or the reference signal received power (RSRP) of one or more feedback signals. The vehicle can determine a second transmit power allocation (e.g., a second TCI state) between TRPs for a second wireless transmission. In one example, if the received signal strength of the feedback signal received by a TRP is relatively low, the vehicle can determine that the receiver device for sending the feedback signal is relatively far from the vehicle and can adjust (e.g., increase) the transmit power allocated to the TRP (e.g., to increase the probability that the receiver device receives the second wireless transmission). Alternatively or additionally, if the received signal strength of the feedback signal received by a TRP is relatively high, the vehicle can determine that the receiver device for sending the feedback signal is relatively close to the vehicle and can adjust (e.g., decrease) the transmit power allocated to the TRP.

[0028] By adjusting the transmit power allocation between TRPs before the expiration of the reservation of time-frequency resources, the vehicle can increase the transmission signal coverage (e.g., to achieve 360-degree coverage associated with the transmission signal). Thus, compared with other techniques (such as techniques that maintain the same transmit power setting during the reservation), the quality of wireless communication can be improved.

[0029] To further illustrate, generally speaking, the present disclosure relates to wireless communication networks and other communication networks such as the following: code division multiple access (CDMA) networks, time division multiple access (TDMA) networks, frequency division multiple access (FDMA) networks, orthogonal FDMA (OFDMA) networks, single-carrier FDMA (SC-FDMA) networks, LTE networks, GSM networks, 5th generation (5G) or new radio (NR) networks (sometimes referred to as "5G NR" networks / systems / devices). As described herein, the terms "network" and "system" can be used interchangeably.

[0030] For example, a CDMA network can implement radio technologies such as universal terrestrial radio access (UTRA), cdma2000, etc. UTRA includes wideband CDMA (WCDMA) and low code rate (LCR). Cdma2000 covers the IS-2000, IS-95, and IS-856 standards.

[0031] For example, a TDMA network can implement radio technologies such as Global System for Mobile Communications (GSM). The Third Generation Partnership Project (3GPP) defines standards for the GSM EDGE (Enhanced Data Rates for GSM Evolution) Radio Access Network (RAN) (also denoted as GERAN). GERAN is the radio component of GSM / EDGE together with the network that combines base stations (e.g., Ater and Abis interfaces) and base station controllers (A interface, etc.). The radio access network represents a component of the GSM network through which telephone calls and packet data are routed from the Public Switched Telephone Network (PSTN) and the Internet to a user's mobile phone (also referred to as a user terminal or user equipment (UE)) and from the user's mobile phone to the PSTN and the Internet. The network of a mobile phone operator can include one or more GREANs, and in the case of a UMTS / GSM network, GERAN can be coupled to a Universal Terrestrial Radio Access Network (UTRAN). Additionally, the operator network can also include one or more LTE networks and / or one or more other networks. Various different network types can use different Radio Access Technologies (RATs) and Radio Access Networks (RANs).

[0032] An OFDMA network can implement radio technologies such as evolved UTRA (E-UTRA), IEEE 802.11, IEEE 802.16, IEEE 802.20, Flash-OFDM, etc. UTRA, E-UTRA, and Global System for Mobile Communications (GSM) are part of the Universal Mobile Telecommunications System (UMTS). In particular, Long Term Evolution (LTE) is a version of UMTS that uses E-UTRA. UTRA, E-UTRA, GSM, UMTS, and LTE are described in documents provided by an organization named "Third Generation Partnership Project" (3GPP), and cdma2000 is described in documents from an organization named "Third Generation Partnership Project 2" (3GPP2). These various radio technologies and standards are known or are under development. For example, 3GPP is a cooperation among various telecommunications associations aimed at defining globally applicable third-generation (3G) mobile phone specifications. 3GPP Long Term Evolution (LTE) is a 3GPP plan aimed at improving the Universal Mobile Telecommunications System (UMTS) mobile phone standard. 3GPP can define specifications for next-generation mobile networks, mobile systems, and mobile devices. Certain aspects of the present disclosure may be described with reference to LTE, 4G, or 5G NR technologies; however, the description is not intended to be limited to a specific technology or application, and one or more aspects described with reference to one technology can be understood to apply to another technology. In fact, one or more aspects of the present disclosure relate to shared access to the radio spectrum between networks using different radio access technologies or radio air interfaces.

[0033] 5G networks are expected to enable diverse deployments, diverse spectrums, and diverse services and devices using a unified air interface based on OFDM. To achieve these goals, in addition to developing new radio technologies for 5G NR networks, further enhancements to LTE and LTE-A are also considered. 5G NR will be able to expand to provide the following coverage: (1) coverage for massive Internet of Things (IoT) with ultra-high density (e.g., ~1M nodes / km^2), ultra-low complexity (e.g., ~10s of bits / second), ultra-low energy (e.g., ~10+ years of battery life), and deep coverage with the ability to reach challenging locations; (2) critical mission control including strong security for protecting sensitive personal, financial, or confidential information, ultra-high reliability (e.g., ~99.9999% reliability), ultra-low latency (e.g., ~1 millisecond (ms)), and users with a wide range of mobility or lack of mobility; and (3) enhanced mobile broadband, which includes extremely high capacity (e.g., ~10 Tbps / km^2), extreme data rates (e.g., multi-Gbps rates, rates for 100+ Mbps user experience), and enhanced discovery and optimized depth perception.

[0034] 5G NR devices, networks, and systems can be implemented using optimized OFDM-based waveform characteristics. These characteristics can include: scalable numerology and transmission time interval (TTI); a common flexible framework to efficiently multiplex services and features using dynamic, low-latency time-division duplex (TDD) / frequency-division duplex (FDD) designs; and improved radio technologies such as massive multiple-input multiple-output (MIMO), robust millimeter-wave (mmWave) transmission, advanced channel coding, and device-centric mobility. The scalability of numerology in 5G NR (with scaling of subcarrier spacing) can efficiently address operating diverse services across diverse spectrums and diverse deployments. For example, in various outdoor and macro-coverage deployments with FDD / TDD below 3 GHz, the subcarrier spacing can occur at 15 kHz for bandwidths such as 1, 5, 10, 20 MHz, etc. For various other outdoor and small cell coverage deployments with TDD above 3 GHz, the subcarrier spacing can occur at 30 kHz for 80 / 100 MHz bandwidths. For various other indoor broadband implementations using TDD in the unlicensed part of the 5 GHz band, the subcarrier spacing can occur at 60 kHz for 160 MHz bandwidths. Finally, for various deployments transmitting using the mmWave component at 28 GHz with TDD, the subcarrier spacing can occur at 120 kHz for 500 MHz bandwidths.

[0035] The scalable numerology of 5G NR facilitates scalable TTIs for diverse latency and Quality of Service (QoS) requirements. For example, shorter TTIs can be used for low latency and high reliability, while longer TTIs can be used for higher spectral efficiency. The efficient multiplexing of long and short TTIs allows transmissions to start on symbol boundaries. 5G NR also anticipates self - contained integrated sub - frame designs, where uplink / downlink scheduling information, data, and acknowledgments are in the same sub - frame. Self - contained integrated sub - frames support communication in unlicensed or contention - based shared spectrum, adaptive uplink / downlink (which can be flexibly configured on a per - cell basis to dynamically switch between uplink and downlink to meet current traffic demands).

[0036] For clarity, certain aspects of the devices and techniques may be described below with reference to an exemplary 5G NR implementation or in a 5G - centric manner, and 5G terminology may be used as illustrative examples in parts of the description below; however, the description is not intended to be limited to 5G applications.

[0037] Furthermore, it should be understood that in operation, a wireless communication network adapted according to the concepts herein may operate using any combination of licensed or unlicensed spectrum depending on load and availability. Thus, it will be apparent to those skilled in the art that the systems, devices, and methods described herein can be applied to other communication systems and applications in addition to the specific examples provided.

[0038] While aspects and implementations are described herein by way of some examples, those skilled in the art will appreciate that additional implementations and use cases can occur in many different arrangements and scenarios. The innovations described herein can be implemented across many different platform types, devices, systems, shapes, sizes, packaging arrangements. For example, the examples and / or uses can be implemented via integrated chips and / or other non-module-component-based devices (e.g., end-user devices, vehicles, communication devices, computing devices, industrial equipment, retail / purchase devices, medical devices, AI-enabled devices, etc.). While some examples may or may not specifically pertain to use cases or applications, there can be a wide variety of applicability of the innovations described. The scope of implementation can range from chip-level or modular components to non-modular, non-chip-level implementations, and further to aggregated, distributed, or OEM devices or systems incorporating one or more of the described aspects. In some practical settings, devices incorporating the described aspects and features may also necessarily include additional components and features for implementing and practicing the claimed and described examples. It is intended that the innovations described herein can be implemented in a variety of implementations, including both large / small devices of different sizes, shapes, and compositions, chip-level components, multi-component systems (e.g., RF chains, communication interfaces, processors), distributed arrangements, end-user devices, etc.

[0039] Figure 1 is a block diagram showing details of an example wireless communication system. The wireless communication system can include a wireless network 100. The wireless network 100 can include, for example, a 5G wireless network. As will be appreciated by those skilled in the art, components that appear in Figure 1 may have relevant counterparts in other network arrangements, including, for example, cellular network arrangements and non-cellular network arrangements (e.g., device-to-device, or peer-to-peer, or ad-hoc network arrangements, etc.).

[0040] In Figure 1The wireless network 100 shown in [Fig. 0] includes a plurality of base stations 105 and other network entities. A base station can be a station that communicates with a UE, and can also be referred to as an evolved Node B (eNB), a next-generation eNB (gNB), an access point, etc. Each base station 105 can provide communication coverage for a specific geographical area. In 3GPP, the term "cell" can refer to the specific geographical coverage area of the base station and / or the base station subsystem serving that coverage area, depending on the context in which the term is used. In the implementation of the wireless network 100 herein, the base stations 105 can be associated with the same operator or different operators (e.g., the wireless network 100 can include multiple operator wireless networks). Additionally, in the implementation of the wireless network 100 herein, the base stations 105 can use one or more of the same frequencies as adjacent cells (e.g., one or more frequency bands in licensed spectrum, unlicensed spectrum, or a combination thereof) to provide wireless communication. In some examples, a single base station 105 or UE 115 can be operated by more than one network operating entity. In some other examples, each base station 105 and UE 115 can be operated by a single network operating entity.

[0041] Base stations can provide communication coverage for macro cells or small cells (such as pico cells or femto cells) and / or other types of cells. A macro cell typically covers a relatively large geographical area (e.g., with a radius of several kilometers) and can allow unrestricted access by UEs with a service subscription to the network provider. A small cell (such as a pico cell) will typically cover a relatively small geographical area and can allow unrestricted access by UEs with a service subscription to the network provider. A small cell (such as a femto cell) will typically cover a relatively small geographical area (e.g., a residence) and can provide restricted access in addition to unrestricted access by UEs associated with the femto cell (e.g., UEs in a Closed Subscriber Group (CSG), UEs for users in a residence, etc.). A base station for a macro cell can be referred to as a macro base station. A base station for a small cell can be referred to as a small cell base station, a pico base station, a femto base station, or a home base station. In Figure 1 the example shown in [Fig. 5], base stations 105d and 105e are conventional macro base stations, while base stations 105a - 105c are macro base stations implemented using one of 3-dimensional (3D), full-dimensional (FD), or massive MIMO. Base stations 105a - 105c utilize their higher-dimensional MIMO capabilities to employ 3D beamforming in both elevation and azimuth beamforming to increase coverage and capacity. Base station 105f is a small cell base station, which can be a home node or a portable access point. A base station can support one or more (e.g., two, three, four, etc.) cells.

[0042] The wireless network 100 can support synchronous operations or asynchronous operations. For synchronous operations, the base stations can have similar frame timings, and transmissions from different base stations can be approximately aligned in time. For asynchronous operations, the base stations can have different frame timings, and transmissions from different base stations can be misaligned in time. In some scenarios, the network can be enabled or configured to handle dynamic switching between synchronous operations and asynchronous operations.

[0043] UEs 115 are dispersed throughout the wireless network 100, and each UE can be stationary or mobile. It should be recognized that although in the standards and specifications published by 3GPP, mobile devices are commonly referred to as user equipment (UEs), such devices can alternatively or otherwise be referred to by those skilled in the art as mobile stations (MSs), user stations, mobile units, user units, radio units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile user stations, access terminals (ATs), mobile terminals, wireless terminals, remote terminals, cellular phones, terminals, user agents, mobile clients, clients, gaming devices, augmented reality devices, vehicle component devices / modules, or some other suitable term. Within this document, a "mobile" device or UE does not necessarily need to have the ability to move and can be stationary. Some non-limiting examples of mobile devices (e.g., implementations that can include one or more of the UEs 115) include mobile phones, cellular (cell) phones, smart phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, laptop computers, personal computers (PCs), notebook computers, netbooks, smartbooks, tablet computers, and personal digital assistants (PDAs). Mobile devices can additionally be "Internet of Things" (IoT) or "Internet of Everything" (IoE) devices, such as cars or other vehicles, satellite radio units, global positioning system (GPS) devices, logistics controllers, drones, multi-rotor aircraft, quadcopters, smart energy or security devices, solar panels or solar arrays, municipal lighting, water or other infrastructure; industrial automation and enterprise equipment; consumer and wearable devices, such as glasses, wearable cameras, smart watches, health or fitness trackers, mammalian implantable devices, posture tracking devices, medical devices, digital audio players (e.g., MP3 players), cameras, gaming consoles, etc.; and digital home or smart home devices, such as home audio, video, and multimedia devices, appliances, sensors, vending machines, smart lighting, home security systems, smart meters, etc. In one aspect, a UE can be a device that includes a universal integrated circuit card (UICC). In another aspect, the UEs 115 can be devices that do not include a UICC. In some aspects, UEs that do not include a UICC can also be referred to as IoE devices. In Figure 1The illustrated implementations of UEs 115a - 115d are examples of mobile smart phone - type devices that access the wireless network 100. The UEs can also be machines specifically configured for connected communications, including machine - type communications (MTC), enhanced MTC (eMTC), narrow - band IoT (NB - IoT), etc. In Figure 1 The illustrated UEs 115e - 115k are examples of various machines configured for communications that access the wireless network 100.

[0044] A mobile device, such as UE 115, is capable of communicating with any type of base station, whether it is a macro - base station, a pico - base station, a femto - base station, a repeater, etc. In Figure 1 the figure, the communication links (represented as lightning bolts) indicate wireless transmissions between the UE and the serving base station (which is the base station designated to serve the UE on the downlink and / or uplink), or desired transmissions between base stations and backhaul transmissions between base stations. The UE can operate as a base station or, in some scenarios, as other network nodes. Backhaul communications between the base stations of the wireless network 100 can occur using wired and / or wireless communication links.

[0045] In the operation at the wireless network 100, the base stations 105a - 105c use 3D beamforming and cooperative spatial techniques, such as coordinated multipoint (CoMP) or multi - connection, to serve UEs 115a and 115b. The macro - base station 105d performs backhaul communications with the base stations 105a - 105c and the small cell (base station 105f). The macro - base station 105d also transmits multicast services subscribed to and received by UEs 115c and 115d. Such multicast services can include mobile TV or streaming video, or can include other services for providing community information, such as weather emergencies or alerts (such as Amber alerts or Gray alerts).

[0046] The implemented wireless network 100 supports mission-critical communications that utilize ultra-reliable and redundant links for mission-critical devices such as UE 115e, which is a drone. The redundant communication links with UE 115e include those from macro base stations 105d and 105e and from small cell base station 105f. Other machine type devices such as UE 115f (thermometer), UE 115g (smart meter), and UE 115h (wearable device) can communicate with the base stations (such as small cell base station 105f and macro base station 105e) either through the wireless network 100 or directly, or be in a multi-hop configuration by communicating with another user equipment that relays their information to the network (such as UE 115f transmitting temperature measurement information to the smart meter (UE 115g), and the temperature measurement information being reported to the network through small cell base station 105f). The wireless network 100 can also provide additional network efficiency through dynamic, low-latency TDD / FDD communications, such as in a vehicle-to-vehicle (V2V) mesh network among UEs 115i - 115k communicating with macro base station 105e.

[0047] Figure 2 A block diagram showing an example design conceptually illustrating base station 105 and UE 115 (which can be any one of the base stations and one of the UEs in Figure 1 ). For the restricted association scenario (as mentioned above), base station 105 can be small cell base station 105f in Figure 1 , and UE 115 can be UE 115c or 115D operating in the service area of base station 105f, which will be included in the list of accessible UEs for small cell base station 105f for accessing small cell base station 105f. Base station 105 can also be some other type of base station. As Figure 2 shown, base station 105 can be equipped with antennas 234a to 234t, and UE 115 can be equipped with antennas 252a to 252r for facilitating wireless communication.

[0048] At base station 105, transmit processor 220 may receive data from data source 212 and control information from controller / processor 240. The control information may be for physical broadcast channel (PBCH), physical control format indicator channel (PCFICH), physical hybrid ARQ (automatic repeat request) indicator channel (PHICH), physical downlink control channel (PDCCH), enhanced physical downlink control channel (EPDCCH), MTC physical downlink control channel (MPDCCH), etc. The data may be for PDSCH, etc. Additionally, transmit processor 220 may process (e.g., encode and symbol map) the data and control information separately to obtain data symbols and control symbols. Transmit processor 220 may also generate reference symbols, such as for primary synchronization signal (PSS) and secondary synchronization signal (SSS) and cell-specific reference signal. Transmit (TX) multiple-input multiple-output (MIMO) processor 230 may perform spatial processing (e.g., precoding) on the data symbols, control symbols, and / or reference symbols (if applicable), and may provide output symbol streams to modulators (MOD) 232a through 232t. For example, the spatial processing performed on the data symbols, control symbols, or reference symbols may include precoding. Each modulator 232 may process (e.g., for OFDM, etc.) its respective output symbol stream to obtain an output sample stream. Each modulator 232 may additionally or alternatively process (e.g., convert to analog, amplify, filter, and up-convert) the output sample stream to obtain a downlink signal. The downlink signals from modulators 232a through 232t may be transmitted via antennas 234a through 234t, respectively.

[0049] At UE 115, antennas 252a through 252r may receive the downlink signals from base station 105 and may provide the received signals to demodulators (DEMOD) 254a through 254r, respectively. Each demodulator 254 may condition (e.g., filter, amplify, down-convert, and digitize) its respective received signal to obtain input samples. Each demodulator 254 may further process (e.g., for OFDM, etc.) the input samples to obtain received symbols. MIMO detector 256 may obtain the received symbols from demodulators 254a through 254r, perform MIMO detection on the received symbols (if applicable), and provide detected symbols. Receive processor 258 may process (e.g., demodulate, de-interleave, and decode) the detected symbols, provide the decoded data for UE 115 to data sink 260, and provide the decoded control information to controller / processor 280.

[0050] On the uplink, at the UE 115, the transmit processor 264 may receive and process data from the data source 262 (e.g., for the physical uplink shared channel (PUSCH)) and control information from the controller / processor 280 (e.g., for the physical uplink control channel (PUCCH)). Additionally, the transmit processor 264 may also generate reference symbols for reference signals. The symbols from the transmit processor 264 may be precoded by the TX MIMO processor 266 (if applicable), further processed by the modulators 254a to 254r (e.g., for SC-FDM, etc.), and transmitted to the base station 105. At the base station 105, the uplink signals from the UE 115 may be received by the antenna 234, processed by the demodulator 232, detected by the MIMO detector 236 (if applicable), and further processed by the receive processor 238 to obtain the decoded data and control information transmitted by the UE 115. The processor 238 may provide the decoded data to the data sink 239 and the decoded control information to the controller / processor 240.

[0051] The controller / processors 240 and 280 may direct the operations at the base station 105 and the UE 115, respectively. The controller / processor 240 and / or other processors and modules at the base station 105 and / or the controller / processor 280 and / or other processors and modules at the UE 115 may execute or direct the execution of the various processes for the techniques described herein, such as Figure 5 one or more operations of Figure 6 one or more operations of or combinations thereof. The memories 242 and 282 may store data and program codes for the base station 105 and the UE 115, respectively. The scheduler 244 may schedule the UE for data transmission on the downlink and / or uplink.

[0052] Wireless communication systems operated by different network operating entities (e.g., network operators) may share the spectrum. In some cases, a network operating entity may be configured to use the entire specified shared spectrum for at least a period of time before another network operating entity uses the entire specified shared spectrum during a different period of time. Thus, to allow network operating entities to use the full specified shared spectrum and to mitigate interference communication between different network operating entities, certain resources (e.g., time) may be partitioned and allocated to different network operating entities for certain types of communication.

[0053] For example, certain time resources can be allocated to a network operating entity, which are reserved for exclusive communication by the network operating entity using the entire shared spectrum. Other time resources can also be allocated to the network operating entity, in which the entity is given a higher priority than other network operating entities to use the shared spectrum for communication. These time resources preferentially used by the network operating entity can be utilized by other network operating entities on an opportunistic basis if the prioritized network operating entity does not utilize these resources. Additional time resources can be allocated for any network operator to use on an opportunistic basis.

[0054] The access to the shared spectrum and the arbitration of time resources among different network operating entities can be centrally controlled by a separate entity, determined autonomously by a predefined arbitration scheme, or determined dynamically based on the interaction among the radio nodes of the network operator.

[0055] In some cases, UE 115 and base station 105 can operate in a shared radio frequency spectrum band, which can include licensed or unlicensed (e.g., contention-based) spectrum. In the unlicensed frequency portion of the shared radio frequency spectrum band, UE 115 or base station 105 can traditionally perform a medium sensing process to compete for access to the spectrum. For example, UE 115 or base station 105 can perform a listen-before-talk or listen-before-transmit (LBT) process (such as clear channel assessment (CCA)) before communication to determine whether the shared channel is available. In some implementations, CCA can include an energy detection process to determine whether there is any other active transmission. For example, the device can infer that a change in the received signal strength indicator (RSSI) of the power meter indicates that the channel is occupied. Specifically, the signal power concentrated in a certain bandwidth and exceeding a predetermined background noise can indicate another wireless transmitter. CCA can also include the detection of a specific sequence used to indicate the use of the channel. For example, another device can send a specific preamble before sending a data sequence. In some cases, the LBT process can include the wireless node adjusting its own backoff window based on the amount of energy detected on the channel and / or the acknowledgment / negative acknowledgment (ACK / NACK) feedback for the packet sent by itself as a proxy for contention.

[0056] Figure 3 Another example of a wireless communication system 300 in accordance with some aspects of the present disclosure is shown. The wireless communication system 300 includes a vehicle 302. In some examples, the vehicle 302 corresponds to a UE, such as Figure 1 one of the UEs 115k-i.

[0057] Vehicle 302 includes a memory 310 and one or more processors coupled to the memory 310, such as processor 320. Processor 320 can access instructions 312 stored in the memory 310 and can execute the instructions 312 to perform one or more operations described herein. Vehicle 302 also includes a plurality of transmit and receive points (TRPs), such as a first TRP 330 and a second TRP 340. Although Figure 3 the example of

[0058] shows that vehicle 302 can include two TRPs 330, 340, in other examples, vehicle 302 can include a different number of TRPs.

[0059] The TRPs of vehicle 302 can be positioned to increase the wireless coverage associated with vehicle 302 (e.g., to achieve 360-degree wireless coverage). For illustration, in some implementations, the first TRP 330 is located in a first region of vehicle 302, and the second TRP 340 is located in a second region of vehicle 301 that is different from the first region. In some examples, the first region corresponds to one of the front of vehicle 302, the rear of vehicle 302, the driver side of vehicle 302, or the passenger side of vehicle 302, and the second region corresponds to another one of the front of vehicle 302, the rear of vehicle 302, the driver side of vehicle 302, or the passenger side of vehicle 302.

[0060] In some examples, vehicle 302 includes one or more features described with reference to Figure 2 the UE 115 of Figure 2 . For example, the antenna devices 332, 342 can include or correspond to any one of the antennas 252a-r of

[0061] Vehicle 302 is configured to wirelessly communicate with one or more devices. For example, vehicle 302 may wirelessly transmit and receive data associated with the operation of vehicle 302 (e.g., direction, speed, acceleration, or other vehicle operation data), sensor data (e.g., traffic density, traffic patterns, or other sensor data), other data, or combinations thereof. In some examples, vehicle 302 includes an on-board unit (OBU) device that wirelessly communicates with other devices such as a roadside unit (RSU) device. In some examples, the RSU device may include or correspond to base station 105 described with reference to Figure 1 and 2 In some implementations, the RSU device may be attached to an infrastructure component (such as a mounting device (e.g., pole, wire, column, or bracket) for a traffic sign or traffic signal, as illustrative examples) or integrated within the infrastructure component. In some other implementations, the RSU device is attached to a "standalone" component (such as a radio tower) or integrated within the "standalone" component.

[0062] In some examples, vehicle 302 corresponds to a motor vehicle, such as a car, truck, bus, motorcycle, or another type of motor vehicle. In some other examples, vehicle 302 may correspond to another vehicle, such as another type of ground vehicle (e.g., bicycle), airplane, boat, amphibious vehicle, rail transport vehicle, or spacecraft, as illustrative examples. Depending on the implementation, vehicle 302 may correspond to an autonomous vehicle, a non-autonomous vehicle, or a semi-autonomous vehicle (e.g., a vehicle including one or more autonomous vehicle systems and one or more non-autonomous systems).

[0063] In some examples, vehicle 302 is configured to perform vehicle-to-everything (V2E) communications, such as cellular V2E (C-V2E) communications. By way of illustration, vehicle 302 may be configured to communicate with other vehicles using vehicle-to-vehicle (V2V) communications, communicate with road infrastructure devices (e.g., RSU devices) using vehicle-to-infrastructure (V2I) communications, communicate with pedestrian devices using vehicle-to-pedestrian (V2P) communications, communicate with cloud devices using vehicle-to-cloud (V2C) communications, or combinations thereof. Additionally, vehicle 302 may be configured to use wireless communications in combination with one or more of V2V communications, V2I communications, V2P communications, or V2C communications.

[0064] For further illustration, in the example of Figure 3 , vehicle 302 may wirelessly communicate with device 350 and device 360. In one example, one or both of devices 350, 360 are included in or correspond to a second vehicle. In some other examples, one or both of the devices may correspond to an infrastructure device (e.g., an RSU device), a pedestrian device, a cloud device, or another device.

[0065] During operation, vehicle 302 may perform a first wireless transmission 370. In some examples, the first wireless transmission 370 includes data associated with the operation of vehicle 302 (e.g., direction, speed, acceleration, or other vehicle operation data), sensor data (e.g., traffic density, traffic patterns, or other sensor data), other data, or a combination thereof. In some examples, vehicle 302 performs the first wireless transmission 370 via a sidelink of a vehicle-to-vehicle wireless communication network.

[0066] Vehicle 302 may perform the first wireless transmission 370 using multiple TRPs, such as TRPs 330, 340. Performing the first wireless transmission 370 using multiple TRPs of vehicle 302 may increase the likelihood that the first wireless transmission 370 is received by one or more devices. By way of illustration, in Figure 3 , using the first TRP 330 may increase the likelihood that device 350 receives the first wireless transmission 370 (if device 350 is closer to the first TRP 330 than the second TRP 340), and using the second TRP 340 may increase the likelihood that device 360 receives the first wireless transmission 370 (if device 360 is closer to the second TRP 340 than the first TRP 330).

[0067] Vehicle 302 may perform the first wireless transmission 370 based on a first transmit power allocation 322 between TRPs 330, 340. By way of illustration, in one example, the first transmit power allocation 322 corresponds to a default power allocation, such as an equal transmit power allocation 322 between TRPs 330, 340 (e.g., where approximately 50% of the total transmit power is allocated to the first TRP 330 and where approximately 50% of the total transmit power is allocated to the second TRP 340).

[0068] One or more devices of the wireless communication system 300 may receive the first wireless transmission 370. For example, device 350 may receive the first wireless transmission 370. Alternatively or additionally, device 360 may receive the first wireless transmission 370. A device that receives the first wireless transmission 370 (or at least a portion of the first wireless transmission 370) may generate a feedback signal based on the first wireless transmission 370. By way of illustration, device 350 may generate a first feedback signal 352 based on the first wireless transmission 370. As another example, device 350 may generate a second feedback signal 362 based on the first wireless transmission 370.

[0069] The feedback signal may indicate a reception status (e.g., pass or fail) associated with the reception of the first wireless transmission 370. For illustration, the first feedback signal 352 may indicate the reception status of the first wireless transmission 370 at the device 350. In some examples, in response to the device 350 successfully receiving and decoding the first wireless transmission 370, the reception status 354 may indicate a success status. For example, the reception status may indicate an acknowledgment (ACK) of the first wireless transmission 370 by the device 350. Alternatively, in response to the device 350 failing to receive and decode the first wireless transmission 370, the reception status 354 may indicate a failure status, such as a negative acknowledgment (NACK) of the first wireless transmission 370 by the device 350.

[0070] For further illustration, the second feedback signal 362 may indicate the reception status of the first wireless transmission 370 at the device 350. In some examples, in response to the device 350 successfully receiving and decoding the first wireless transmission 370, the reception status 354 may indicate a success status. For example, the reception status may indicate a negative acknowledgment (NACK) of the first wireless transmission 370 by the device 350. Similarly, the second feedback signal 362 may indicate the reception status 364 (e.g., ACK or NACK) of the first wireless transmission 370 at the device 360.

[0071] The vehicle 302 may receive one or more feedback signals. For example, the vehicle 302 may receive the first feedback signal 352 using the first TRP 330, using the second TRP 340, or both. As another example, the vehicle 302 may receive the second feedback signal 362 using the first TRP 330, using the second TRP 340, or both.

[0072] The vehicle 302 may determine the second transmit power allocation 324 based on one or more feedback signals. The second transmit power allocation 324 may be based on the first received signal strength 326, which is determined based on one or more feedback signals (e.g., the first feedback signal 352, the second feedback signal 362, or both) detected by the first TRP 330. Alternatively or additionally, the second transmit power allocation 324 may be determined based on the second received signal strength 328, which is determined based on one or more feedback signals (e.g., the first feedback signal 352, the second feedback signal 362, or both) detected by the second TRP 340.

[0073] For further illustration, Figure 4 illustrates an example of transmit power adjustment in accordance with some aspects of the present disclosure. In Figure 4In the example, the amplitude 402 of the received signal strength measured by the first TRP 330 can be greater than the amplitude 404 of the received signal strength measured by the first TRP 330. In some examples, the amplitude 402 corresponds to the amplitude of the first received signal strength 326, and the amplitude 404 corresponds to the amplitude of the second received signal strength 328.

[0074] In some examples, the amplitudes 402, 404 indicate the received signal strengths of feedback signals from multiple packet receiver devices, such as the feedback signals 352, 362 from devices 350, 360. In one example, the amplitude 402 indicates the first aggregated received signal strength of one or more signals received by the first TRP 330 (e.g., the first feedback signal 352, the second feedback signal 362, or both), and the amplitude 404 indicates the second aggregated received signal strength of one or more signals received by the second TRP 340 (e.g., the first feedback signal 352, the second feedback signal 362, or both). In some examples, the amplitude 402 can be different from (e.g., greater than) the amplitude 404, e.g., due to differences in the physical locations of the TRPs 330, 340, differences in the physical locations of the devices 350, 360, differences in the directions associated with the feedback signals 352, 362, differences in the path loss characteristics associated with the TRP-to-device links between the TRPs 330, 340 and the devices 350, 360, or a combination thereof.

[0075] In some wireless communication protocols (such as wireless communication protocols that use power control techniques), a larger amplitude 402 can indicate that a device has difficulty receiving signals from the vehicle 302 (e.g., due to path loss associated with one or more obstacles) and thus increases the power of the transmitted feedback signal (e.g., to overcome the path loss). Additionally, a smaller amplitude 404 can indicate that other transmitting devices have less difficulty receiving signals from the vehicle 302 (and thus avoid increasing the transmit power or reduce the transmit power of the transmitted feedback signal). The vehicle 302 can determine a second transmit power allocation 324 to compensate for this effect, e.g., by increasing the amount of power allocated to the first TRP 330, by reducing the amount of power allocated to the second TRP 340, or both, as Figure 4 shown in the example of

[0076] Referring again to Figure 3, according to a particular implementation, the received signal strengths 326, 328 may include one or more signal strength characteristics or metrics. In one example, the first received signal strength 326 corresponds to a first reference signal strength indicator (RSSI) of the first feedback signal 352, and the second received signal strength 328 corresponds to a second RSSI of the second feedback signal 362. In another example, the first received signal strength 326 corresponds to a first reference signal received power (RSRP) of the first feedback signal 352, and the second received signal strength 328 corresponds to a second RSRP of the second feedback signal 362.

[0077] In some examples, the vehicle 302 may adjust the first transmit power allocation 322 (e.g., based on the first received signal strength 326, the second received signal strength 338, or both) to determine the second transmit power allocation 324. In some examples, adjusting the first transmit power allocation 322 includes increasing a first amount of power associated with the first TRP 330 based on the second received signal strength 328 exceeding the first received signal strength 326, decreasing a second amount of power associated with the second TRP 340 based on the second received signal strength exceeding the first received signal strength 326, or both.

[0078] The vehicle 302 may perform a second wireless transmission 380 based on the second transmit power allocation 324. The vehicle 302 may perform the second wireless transmission 380 using multiple TRPs (such as TRPs 330, 340). In some examples, the vehicle 302 performs the second wireless transmission 380 via a sidelink of a vehicle-to-vehicle wireless communication network. In some examples, the second wireless transmission 380 includes or corresponds to a retransmission of the first wireless transmission 370 (e.g., in response to one or both of the reception states 354, 364 indicating NACK). In some other examples, the second wireless transmission 380 includes data different from the data included in the first wireless transmission 370 (e.g., in response to one or both of the reception states 354, 364 indicating ACK).

[0079] The examples described herein are applicable to various wireless communication protocols, such as wireless communication protocols that use only NACK feedback (without using ACK-based feedback), wireless communication protocols that use both ACK-based feedback and NACK-based feedback, wireless communication protocols that do not use power control techniques, and wireless communication protocols that use power control techniques.

[0080] For illustration, in an example of a wireless communication protocol using only NACK feedback without power control, one or both of the feedback signals 352, 362 may include a NACK of the first wireless transmission 370 (e.g., a Hybrid Automatic Repeat reQuest (HARQ) NACK). The vehicle 302 may determine a received power allocation 329 for one or both of the feedback signals 352, 362 among the plurality of TRPs 330, 340. The vehicle 302 may adjust the first transmit power allocation 322 inversely proportional to the received power allocation 329 to determine a second transmit power allocation 324. In some implementations, increasing the transmit power allocation inversely proportional to the received signal strength may compensate for the path loss characteristics of the communication channel of the wireless communication system 300.

[0081] In an example of a wireless communication protocol using only NACK feedback with power control, one or both of the feedback signals 352, 362 may include a NACK of the first wireless transmission 370 (e.g., a HARQ NACK). The vehicle 302 may determine a received power allocation 329 for one or both of the feedback signals 352, 362 among the plurality of TRPs 330, 340. The vehicle 302 may adjust the first transmit power allocation 322 proportional to the received power allocation 329 to determine a second transmit power allocation 324. For further illustration, Figure 4 The example shown in may correspond to an example of a wireless communication protocol using only NACK feedback with power control.

[0082] In an example of a wireless communication protocol using ACK-based and NACK-based feedback without power control, one or both of the feedback signals 352, 362 may include a HARQ ACK of the first wireless transmission 370 or a HARQ NACK of the first wireless transmission 370. The vehicle 302 may determine a received power allocation 329 for one or both of the feedback signals 352, 362 among the plurality of TRPs 330, 340. The vehicle 302 may adjust the first transmit power allocation 322 inversely proportional to the received power allocation 329 to determine a second transmit power allocation 324.

[0083] In an example of a wireless communication protocol using ACK-based and NACK-based feedback with power control, one or both of the feedback signals 352, 362 may include a HARQ ACK for the first wireless transmission 370 or a HARQ NACK for the first wireless transmission 370. The vehicle 302 may determine a received power allocation 329 for one or both of the feedback signals 352, 362 among the plurality of TRPs 330, 340. The vehicle 302 may adjust the first transmit power allocation 322 inversely proportional to the received power allocation 329 to determine a second transmit power allocation 324 (e.g., by increasing the power assigned to the TRP that receives the NACK).

[0084] In some examples, the vehicle 302 may communicate with a device using a common frequency resource to send a NACK feedback signal, which may be referred to as Single Frequency Network NACK (SFN). In some cases, a first device that sends the SFN may be relatively close to the vehicle 302, and a second device that sends the SFN may be relatively far from the vehicle 302. The vehicle 302 may adjust the transmit power allocation based on the SFN (e.g., by reducing the transmit power allocated in the direction of the first device, by increasing the transmit power allocated in the direction of the second device, or both).

[0085] In some implementations, one or more precoders may be used to select or adjust the power transmit power allocation among the TRPs of the vehicle 302. By way of illustration, in some examples, each of the TRPs 330, 340 includes a plurality of precoders 334. In an illustrative example, the vehicle 302 uses a first set of precoders 336 among the plurality of precoders 334 to perform the first wireless transmission 370. The vehicle 302 may select a second set of precoders 346 for a second wireless transmission 380 from among the plurality of precoders 334. As a non-limiting example, the first set of precoders 336 may enable the first wireless transmission 370 to have an approximately balanced transmit power distribution among the TRPs 330, 340, and the second set of precoders 346 may increase the transmit power assigned to the first TRP 330 or may decrease the transmit power assigned to the second TRP 340, e.g., Figure 4 as shown in the example of.

[0086] In some examples, the first wireless transmission 370 may include sidelink control information (SCI) 372. The SCI 372 may include information related to the first wireless transmission 370, information related to the second wireless transmission 380, or both. By way of illustration, the SCI 372 may indicate the first set of precoders 336, the second set of precoders 346, or both.

[0087] In some examples, the SCI 372 indicates a first transmission configuration indicator (TCI) state 374 associated with the vehicle 302. The first TCI state 374 may correspond to a specific transmission state for performing the first wireless transmission 370. The SCI 372 may also indicate a reservation 376 of one or more time-frequency resources (e.g., for a second wireless transmission 380, for one or more other subsequent wireless transmissions, or a combination thereof).

[0088] In some examples, the reservation 376 is "blind" to feedback received by the vehicle 302 in response to the first wireless transmission 370. By way of illustration, the reservation 377 may reserve one or more time-frequency resources for a retransmission of the first wireless transmission, and the vehicle 302 may perform the retransmission independently of one or more feedback signals (such as the first feedback signal 352, the second feedback signal 362, or both). In some other examples, the reservation 376 may reserve one or more time-frequency resources for a transmission different from the first wireless transmission 370, e.g., for a wireless transmission of a packet not included in the first wireless transmission 370.

[0089] The SCI 372 may optionally indicate one or more second TCI states 378. In some examples, the one or more TCI states 378 may correspond to the one or more time-frequency resources identified by the reservation 376 and may be associated with the second wireless transmission 380. The second TCI state 378 may correspond to or include a specific TCI state that the vehicle 302 will use for the second wireless transmission 380 (which may be the same as or different from the first TCI state 384). Thus, in some examples, the first wireless transmission 370 identifies (e.g., via the SCI 372) one or more TCI states to be used for the second wireless transmission 380.

[0090] In some other examples, when performing the first wireless transmission 370, the TCI state to be used for the second wireless transmission 380 may not be determined (e.g., if the vehicle 302 is to determine the TCI state of the second wireless transmission 380 based on one or more feedback signals received in response to the first wireless transmission 370). In such a case, the SCI 372 may indicate that one or more second TCI states 378 will be determined subsequently or that one or more second TCI states 378 will be determined subsequently based on one or more feedback signals.

[0091] In some other implementations, the SCI 372 may indicate a set of candidate TCI states corresponding to one or more time-frequency resources identified by the reservation 376 and used for the second wireless transmission 380. By way of illustration, the set of candidate TCI states may include a first TCI state corresponding to an approximately equal transmit power allocation between the TRPs 330, 340, a second TCI state with a transmit power allocated to the second TRP 340 being more than the transmit power allocated to the first TRP 330, and a third TCI state with a transmit power allocated to the first TRP 330 being more than the transmit power allocated to the second TRP 340. The vehicle 302 may select a specific candidate TCI state from the set of candidate TCI states after transmitting the SCI 372.

[0092] By way of illustration, in one example, the vehicle 302 selects a first candidate TCI state corresponding to the first TCI state 374 of the second wireless transmission 380 from the set of candidate TCI states (e.g., to maintain the first transmit power allocation 322 for the second wireless transmission 380 if the first received signal strength 326 is approximately equal to the second received signal strength 328). In another example, the vehicle 302 selects a second candidate TCI state for the second wireless transmission from the set of candidate TCI states based on the first received signal strength 326 exceeding the second received signal strength 328 (e.g., to increase the transmit power allocated to the second TRP 340). In another example, the vehicle 302 selects a third candidate TCI state for the second wireless transmission from the set of candidate TCI states based on the first received signal strength 326 being less than the second received signal strength 328 (e.g., to increase the transmit power allocated to the first TRP 330).

[0093] In some implementations, the vehicle 302 maintains a transmit power allocation history 314. In some examples, the transmit power allocation history 314 is stored at the memory 310. In some other examples, the transmit power configuration history 314 may be stored external to the vehicle 302, such as in a cloud server, as an illustrative example. The vehicle 302 may update the transmit power allocation history 314 based on the transmit power allocations determined during the operation of the vehicle 302 (e.g., based on the first transmit power allocation 322, the second transmit power allocation 324, or both). For further illustration, in some examples, the first transmit power allocation 322 corresponds to a biased power allocation selected based on the transmit power allocation history 314.

[0094] In some examples, the transmit power allocation history 314 can be accessed (or indexed) based on a geographical location. For example, a particular city, street, or other geographical location can be associated with certain wireless fading characteristics. For instance, if the first side of a particular street is associated with obstacles (e.g., buildings, roadblocks, or other obstacles), and if the second side of the street is relatively obstacle-free. In this example, the vehicle 302 can determine to increase (e.g., positively bias) the transmit power to the first side, decrease (e.g., negatively bias) the transmit power associated with the second side, or both, based on the transmit power allocation history 314.

[0095] Alternatively or additionally, the transmit power allocation history 314 can be accessed (or indexed) based on other information, such as date or time information. For example, certain times of the day (e.g., peak hours) may be associated with certain wireless fading characteristics, such as increased noise or interference due to increased vehicle traffic, increased wireless communication, or both. In some examples, the vehicle 302 can determine to increase (e.g., positively bias) the transmit power during one time of the day (e.g., peak hours), decrease (e.g., negatively bias) the transmit power during another time of the day (e.g., night), or both, based on the transmit power allocation history 314.

[0096] Figure 3 and 4 One or more aspects of can improve the performance of the wireless communication system 300. By way of illustration, in one example, the first wireless transmission 370 is performed based on the first TCI state 374 and indicates a reservation 376, and the second wireless transmission 380 can be performed when the reservation 376 is valid and based on a TCI state different from the first TCI state 374 (e.g., based on one of the second TCI states 378). Thus, by determining the received signal strength based on the feedback signal, the second transmit power allocation 324 can be changed relative to the first transmit power allocation 322 without waiting for the reservation 376 to expire. Accordingly, the transmission signal coverage associated with the vehicle 302 can be improved.

[0097] Figure 5 is a flowchart of an illustrative example of a method 500 for wireless communication according to some aspects of the present disclosure. In some implementations, the method 500 is performed by a vehicle (such as the Figure 3 vehicle 302).

[0098] The method 500 includes, at 502, performing a first wireless transmission using a plurality of TRPs of the vehicle. The first wireless transmission is performed based on a first transmit power allocation among the plurality of TRPs. For example, the vehicle 302 can perform the first wireless transmission 370 using the TRPs 330, 340 and based on the first transmit power allocation 322.

[0099] Method 500 further includes: at 504, in response to the first wireless transmission, receiving one or more feedback signals for indicating the reception status of the first wireless transmission at one or more devices. For example, vehicle 302 may receive a first feedback signal 352 for indicating reception status 354 (e.g., an ACK or NACK for indicating whether device 350 has successfully received and decoded the first wireless transmission 370). Alternatively or additionally, vehicle 302 may receive a second feedback signal 362 for indicating reception status 364 (e.g., an ACK or NACK for indicating whether device 360 has successfully received and decoded the first wireless transmission 370).

[0100] Method 500 further includes: at 506, using multiple TRPs to perform a second wireless transmission based on a second transmit power allocation among the multiple TRPs. The second transmit power allocation is determined based on at least one received signal strength of one or more feedback signals. For example, vehicle 302 may perform a second wireless transmission 380 based on the second transmit power allocation 324.

[0101] Figure 6 is a flowchart of another method 600 of wireless communication according to some aspects of the present disclosure. In some aspects, method 600 is performed by a device communicating with vehicle 302 (e.g., by device 350 or device 360, as illustrative examples).

[0102] Method 600 includes: the device receiving a first wireless transmission performed by multiple TRPs of a vehicle based on a first transmit power allocation among the multiple TRPs. For example, device 350 or device 360 may receive a first wireless transmission 370 from vehicle 302. Vehicle 302 may use TRPs 330, 340 and transmit the first wireless transmission 370 based on the first transmit power allocation 322.

[0103] Method 600 further includes, at 604, in response to the first wireless transmission, sending a feedback signal for indicating the reception status of the first wireless transmission at the device. For example, device 350 may send a first feedback signal 352 for indicating reception status 354. As another device, device 360 may send a second feedback signal 362 for indicating reception status 364.

[0104] Method 600 further includes: at 606, the device receiving a second wireless transmission performed by multiple TRPs based on a second transmit power allocation among the multiple TRPs. The second transmit power allocation is based on the received signal strength of the feedback signal. By way of illustration, device 350 or device 360 may receive a second wireless transmission 380. Vehicle 302 may use TRPs 330, 340 and perform the second wireless transmission 380 based on the second transmit power allocation 324.

[0105] Figure 7 is a block diagram showing an example of UE 115 in accordance with some aspects of the present disclosure. UE 115 may include a processor 280 and a memory 282. The processor 280 may execute instructions 702 (e.g., instruction 312) stored in the memory 282 to initiate, execute, or control one or more operations described herein. The processor 280 may execute the instructions 702 to transmit and receive signals via the wireless radio units 701a-r and antennas 252a-r. The wireless radio units 701a-r may include hardware or other components corresponding to one or more features described with reference to Figure 2 such as modulators / demodulators 254a-r, MIMO detectors 256, receive processors 258, transmit processors 264, TX MIMO processors 266, one or more other components, or combinations thereof. In some examples, the processor 280 executes transmit power allocation determination instructions 704 to determine one or more transmit power allocations, such as a first transmit power allocation 322, a second transmit power allocation 324, one or more other transmit power allocations, or combinations thereof.

[0106] In a first aspect, a method of wireless communication includes: performing a first wireless transmission using a plurality of TRPs of a vehicle. The first wireless transmission is performed based on a first transmit power allocation among the plurality of TRPs. The method further includes: in response to the first wireless transmission, receiving one or more feedback signals for indicating a reception status of the first wireless transmission at one or more devices. The method further includes: performing a second wireless transmission using the plurality of TRPs based on a second transmit power allocation among the plurality of TRPs. The second transmit power allocation is determined based on at least one received signal strength of the one or more feedback signals.

[0107] In a second aspect, individually or in combination with the first aspect, the method further includes: determining a first received signal strength associated with a first TRP among the plurality of TRPs, the at least one received signal strength including the first received signal strength; determining a second received signal strength associated with a second TRP among the plurality of TRPs, the at least one received signal strength further including the second received signal strength; and adjusting the first transmit power allocation based on the first received signal strength and the second received signal strength to determine the second transmit power allocation.

[0108] In a third aspect, either alone or in combination with one or more of the first aspect to the second aspect, adjusting the first transmit power allocation includes: increasing a first power amount associated with the first TRP based on the second received signal strength exceeding the first received signal strength, decreasing a second power amount associated with the second TRP based on the second received signal strength exceeding the first received signal strength, or both.

[0109] In a fourth aspect, either alone or in combination with one or more of the first aspect to the third aspect, the first received signal strength corresponds to a first RSSI of the first feedback signal, and the second received signal strength corresponds to a second RSSI of the second feedback signal.

[0110] In a fifth aspect, either alone or in combination with one or more of the first aspect to the fourth aspect, the first received signal strength corresponds to a first RSRP of the first feedback signal, and the second received signal strength corresponds to a second RSRP of the second feedback signal.

[0111] In a sixth aspect, either alone or in combination with one or more of the first aspect to the fifth aspect, the one or more feedback signals include a HARQ NACK of the first wireless transmission, and the method further includes: determining a received power allocation of the one or more feedback signals among the plurality of TRPs; and adjusting the first transmit power allocation inversely proportional to the received power allocation to determine the second transmit power allocation.

[0112] In a seventh aspect, either alone or in combination with one or more of the first aspect to the sixth aspect, the one or more feedback signals include a HARQ NACK of the first wireless transmission, and the method further includes: determining a received power allocation of the one or more feedback signals among the plurality of TRPs; and adjusting the first transmit power allocation proportionally to the received power allocation to determine the second transmit power allocation.

[0113] In an eighth aspect, either alone or in combination with one or more of the first aspect to the seventh aspect, the one or more feedback signals include one or more of a HARQ ACK of the first wireless transmission or a HARQ NACK of the first wireless transmission, and the method further includes: determining a received power allocation of the one or more feedback signals among the plurality of TRPs; and adjusting the first transmit power allocation inversely proportional to the received power allocation to determine the second transmit power allocation.

[0114] In a ninth aspect, the one or more feedback signals include one or more of the HARQ ACK of the first wireless transmission or the HARQ NACK of the first wireless transmission, and the method further includes: determining a reception power allocation of the one or more feedback signals among the plurality of TRPs; and adjusting the first transmission power allocation inversely proportional to the reception power allocation to determine the second transmission power allocation.

[0115] In a tenth aspect, either alone or in combination with one or more of the first to ninth aspects, the one or more devices are included in or correspond to a second vehicle, and the first wireless transmission and the second wireless transmission are performed via a sidelink of a vehicle-to-vehicle wireless communication network.

[0116] In an eleventh aspect, either alone or in combination with one or more of the first to tenth aspects, a first TRP of the plurality of TRPs is located in a first area of the vehicle, and a second TRP of the plurality of TRPs is located in a second area of the vehicle different from the first area.

[0117] In a twelfth aspect, either alone or in combination with one or more of the first to eleventh aspects, the first area corresponds to one of a front portion of the vehicle, a rear portion of the vehicle, a driver side of the vehicle, or a passenger side of the vehicle, and the second area corresponds to another one of the front portion of the vehicle, the rear portion of the vehicle, the driver side of the vehicle, or the passenger side of the vehicle.

[0118] In a thirteenth aspect, either alone or in combination with one or more of the first to twelfth aspects, the first wireless transmission includes an SCI, the SCI indicating a first TCI state associated with the vehicle and further indicating a reservation of one or more time-frequency resources.

[0119] In a fourteenth aspect, either alone or in combination with one or more of the first to thirteenth aspects, the reservation is for a retransmission of the first wireless transmission, and the method further includes: performing the retransmission independently of the one or more feedback signals.

[0120] In a fifteenth aspect, either alone or in combination with one or more of the first to fourteenth aspects, the one or more time-frequency resources are used for wireless transmission of packets not included in the first wireless transmission.

[0121] In a sixteenth aspect, either alone or in combination with one or more of the first to fifteenth aspects, the SCI further indicates one or more second TCI states of the vehicle corresponding to the one or more time-frequency resources, and the one or more second TCI states are associated with the second wireless transmission.

[0122] In a seventeenth aspect, either alone or in combination with one or more of the first to sixteenth aspects, the SCI further indicates that one or more second TCI states of the vehicle will be determined subsequently or that the one or more second TCI states will be determined based on the one or more feedback signals subsequently.

[0123] In an eighteenth aspect, either alone or in combination with one or more of the first to seventeenth aspects, the SCI further indicates a set of candidate TCI states of the vehicle corresponding to the one or more time-frequency resources and for the second wireless transmission.

[0124] In a nineteenth aspect, either alone or in combination with one or more of the first to eighteenth aspects, the method further includes: after sending the SCI, selecting a first candidate TCI state corresponding to the first TCI state for the second wireless transmission from the set of candidate TCI states.

[0125] In a twentieth aspect, either alone or in combination with one or more of the first to nineteenth aspects, the method further includes: after sending the SCI, selecting a second candidate TCI state for the second wireless transmission from the set of candidate TCI states based on the first received signal strength of the first feedback signal among the one or more feedback signals exceeding the second received signal strength of the second feedback signal among the one or more feedback signals.

[0126] In a twenty-first aspect, either alone or in combination with one or more of the first to twentieth aspects, the method further includes: after sending the SCI, selecting a third candidate TCI state for the second wireless transmission from the set of candidate TCI states based on the first received signal strength of the first feedback signal among the one or more feedback signals being less than the second received signal strength of the second feedback signal among the one or more feedback signals.

[0127] In a twenty-second aspect, either alone or in combination with one or more of the first to twenty-first aspects, the first wireless transmission is performed using a first set of precoders included in a plurality of precoders of the vehicle, and the method further includes: selecting a second set of precoders for the second wireless transmission from the plurality of precoders.

[0128] In a twenty-third aspect, either alone or in combination with one or more of the first to twenty-second aspects, the first wireless transmission is also performed using the first antenna or antenna panel of the vehicle, and the second wireless transmission is also performed using the second antenna or antenna panel of the vehicle.

[0129] In a twenty-fourth aspect, either alone or in combination with one or more of the first to twenty-third aspects, the first transmit power allocation corresponds to a balanced transmit power allocation among the plurality of TRPs.

[0130] In a twenty-fifth aspect, either alone or in combination with one or more of the first to twenty-fourth aspects, the first transmit power allocation corresponds to a biased power allocation selected based on a transmit power allocation history associated with the vehicle.

[0131] In a twenty-sixth aspect, either alone or in combination with one or more of the first to twenty-fifth aspects, the first wireless transmission is performed based on a first TCI state and indicates the reservation of one or more time-frequency resources, and the second wireless transmission is performed when the reservation is valid, based on a second TCI state different from the first TCI state, and using the one or more time-frequency resources.

[0132] In a twenty-seventh aspect, an apparatus includes a memory and one or more processors coupled to the memory. The one or more processors are configured to perform a first wireless transmission using the plurality of TRPs based on a first transmit power allocation among the plurality of TRPs of a vehicle. The one or more processors are further configured to, in response to the first wireless transmission, receive one or more feedback signals for indicating a reception state of the first wireless transmission at one or more devices. The one or more processors are further configured to perform a second wireless transmission using the plurality of TRPs based on a second transmit power allocation among the plurality of TRPs. The second transmit power allocation is determined based on at least one received signal strength of the one or more feedback signals.

[0133] In a twenty-eighth aspect, a device includes: a unit for performing a first wireless transmission using a plurality of TRPs of a vehicle. The first wireless transmission is performed based on a first transmit power allocation among the plurality of TRPs. The device further includes: a unit for receiving, in response to the first wireless transmission, one or more feedback signals for indicating a reception status of the first wireless transmission at one or more devices. The device further includes: a unit for performing a second wireless transmission using the plurality of TRPs based on a second transmit power allocation among the plurality of TRPs, wherein the second transmit power allocation is determined based on at least one received signal strength of the one or more feedback signals.

[0134] In a twenty-ninth aspect, a non-transitory computer-readable medium stores instructions executable by a processor to perform operations. The operations include: performing a first wireless transmission using a plurality of TRPs of a vehicle. The first wireless transmission is performed based on a first transmit power allocation among the plurality of TRPs. The operations further include: receiving, in response to the first wireless transmission, one or more feedback signals for indicating a reception status of the first wireless transmission at one or more devices. The operations further include: performing a second wireless transmission using the plurality of TRPs based on a second transmit power allocation among the plurality of TRPs. The second transmit power allocation is determined based on at least one received signal strength of the one or more feedback signals.

[0135] In a thirtieth aspect, a method of wireless communication includes: receiving, by a device, a first wireless transmission performed by a plurality of TRPs of a vehicle based on a first transmit power allocation among the plurality of TRPs. The method further includes: sending, in response to the first wireless transmission, a feedback signal for indicating a reception status of the first wireless transmission at the device. The method further includes: receiving, by the device, a second wireless transmission performed by the plurality of TRPs based on a second transmit power allocation among the plurality of TRPs. The second transmit power allocation is based on a received signal strength of the feedback signal.

[0136] In a thirty-first aspect, either alone or in combination with the thirtieth aspect, the device is included in or corresponds to a second vehicle, and the first wireless transmission and the second wireless transmission are performed via a sidelink of a vehicle-to-vehicle wireless communication network.

[0137] In a thirty-second aspect, either alone or in combination with one or more of the thirtieth to thirty-first aspects, the first wireless transmission includes an SCI that indicates a first TCI state associated with the vehicle and also indicates a reservation of one or more time-frequency resources.

[0138] In a thirty-third aspect, either alone or in combination with one or more of the thirtieth to thirty-second aspects, the retransmission for the first wireless transmission is reserved, and the method further includes: performing the retransmission independently of the one or more feedback signals.

[0139] In a thirty-fourth aspect, either alone or in combination with one or more of the thirtieth to thirty-third aspects, the one or more time-frequency resources are used for wireless transmission of packets not included in the first wireless transmission.

[0140] In a thirty-fifth aspect, either alone or in combination with one or more of the thirtieth to thirty-fourth aspects, the SCI further indicates one or more second TCI states of the vehicle corresponding to the one or more time-frequency resources, and the one or more second TCI states are associated with the second wireless transmission.

[0141] In a thirty-sixth aspect, either alone or in combination with one or more of the thirtieth to thirty-fifth aspects, the SCI further indicates that one or more second TCI states of the vehicle will be determined subsequently or will be determined subsequently based on the one or more feedback signals.

[0142] In a thirty-seventh aspect, either alone or in combination with one or more of the thirtieth to thirty-sixth aspects, the SCI further indicates a set of candidate TCI states of the vehicle corresponding to the one or more time-frequency resources and used for the second wireless transmission.

[0143] In a thirty-eighth aspect, either alone or in combination with one or more of the thirtieth to thirty-seventh aspects, the first transmit power allocation corresponds to a balanced transmit power allocation among the plurality of TRPs.

[0144] In a thirty-ninth aspect, either alone or in combination with one or more of the thirtieth to thirty-eighth aspects, the first transmit power allocation corresponds to a biased power allocation selected based on the transmit power allocation history associated with the vehicle.

[0145] In a fortieth aspect, either alone or in combination with one or more of the thirtieth to thirty-ninth aspects, the first wireless transmission is performed based on a TCI state and indicates reservation of one or more time-frequency resources, and the second wireless transmission is performed based on a second TCI state different from the first TCI state and using the one or more time-frequency resources when the reservation is valid.

[0146] In a forty-first aspect, an apparatus includes a memory and one or more processors coupled to the memory. The one or more processors are configured to: receive a first wireless transmission performed by a plurality of transmit receive points (TRPs) of a vehicle based on a first transmit power allocation among the plurality of TRPs. The one or more processors are further configured to: in response to the first wireless transmission, send a feedback signal for indicating a reception status of the first wireless transmission. The one or more processors are further configured to: receive a second wireless transmission performed by the plurality of TRPs based on a second transmit power allocation among the plurality of TRPs. The second transmit power allocation is based on a received signal strength of the feedback signal.

[0147] In a forty-second aspect, an apparatus includes: a unit for receiving a first wireless transmission performed by a plurality of TRPs of a vehicle based on a first transmit power allocation among the plurality of TRPs. The apparatus further includes: a unit for, in response to the first wireless transmission, sending a feedback signal for indicating a reception status of the first wireless transmission. The apparatus further includes: a unit for receiving a second wireless transmission performed by the plurality of TRPs based on a second transmit power allocation among the plurality of TRPs. The second transmit power allocation is based on a received signal strength of the feedback signal.

[0148] In a forty-third aspect, a non-transitory computer-readable medium stores instructions executable by a processor to perform operations. The operations include: receiving, by a device, a first wireless transmission performed by a plurality of TRPs of a vehicle based on a first transmit power allocation among the plurality of TRPs. The operations further include: in response to the first wireless transmission, sending a feedback signal for indicating a reception status of the first wireless transmission at the device. The operations further include: receiving, by the device, a second wireless transmission performed by the plurality of TRPs based on a second transmit power allocation among the plurality of TRPs. The second transmit power allocation is based on a received signal strength of the feedback signal.

[0149] Those skilled in the art will understand that information and signals may be represented using any of a variety of different technologies and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0150] The components, functional blocks, and modules described herein (e.g., Figure 2The components, functional blocks and modules in the present invention may include: processors, electronic devices, hardware devices, electronic components, logical circuits, memories, software codes, firmware codes, etc., or any combination thereof. In addition, one or more features described herein may be implemented via dedicated processor circuits, via executable instructions and / or a combination thereof.

[0151] It will also be appreciated by those skilled in the art that the various illustrative logical blocks, modules, circuits, and operations described herein (e.g., Figure 5 and 6 Operations) can be implemented as electronic hardware, computer software or a combination of the two. In order to clearly illustrate this interchangeability of hardware and software, various illustrative components, frames, modules, circuits and operations have been generally described above around their functions. As for whether such functions are implemented as hardware or software, it depends on the specific application and the design constraints imposed on the entire system. A skilled person can implement the described functions in an alternative manner for each specific application, but such implementation decisions should not be interpreted as causing deviations from the scope of the present disclosure. A skilled person will also recognize that the order or combination of components, methods or interactions described herein are only examples, and the components, methods or interactions of various aspects of the present disclosure can be combined or performed in a manner different from those shown and described herein.

[0152] The various illustrative logic blocks, modules, and circuits described in conjunction with the disclosure herein may be implemented or performed using a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0153] The operations of the methods or processes described in connection with the present disclosure may be embodied directly in hardware, in a software module executed by a processor, or in a combination of both. The software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such that the processor can read information from, and write information to, the storage medium. In an alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In an alternative, the processor and the storage medium may reside as discrete components in a user terminal.

[0154] In one or more exemplary designs, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A computer-readable storage medium may be any available medium that can be accessed by a general or special purpose computer. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instruction or data structures and that can be accessed by a general or special purpose computer or a general or special purpose processor. Also, a connection may be properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using a coaxial cable, fiber optic cable, twisted pair, or digital subscriber line (DSL), then the coaxial cable, fiber optic cable, twisted pair, or DSL is included in the definition of medium. As used herein, disk and disc include compact disc (CD), laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above should also be included within the scope of computer-readable media.

[0155] As used herein (including in the claims), the term "and / or" when used in a list of two or more items means that any one of the listed items can be taken alone, or any combination of two or more of the listed items can be taken. For example, if a composition is described as including components A, B, and / or C, the composition can include: only A; only B; only C; A combined with B; A combined with C; B combined with C; or A, B, and C combined. Further, as used herein (including in the claims), "or" as used in a list of items that ends with "at least one of..." indicates a disjunctive list such that, for example, a list of "at least one of A, B, or C" means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) or any one of these items in any combination thereof.

[0156] The foregoing description of the disclosure is provided to enable a person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0157] Appendix: Enhancement of mTRP Sidelink Retransmission Power Allocation

[0158] mTRP SL: Coverage Enhancement for V2X Communication

[0159] · Multiple transmit and receive points (multi-TRPs) are crucial in 5G and can demonstrate reliability, coverage, and capacity performance through feasible deployment scenarios.

[0160] coverage range and capacity performance.

[0161] · Specifically, mTRPs equipped at different parts of a vehicle are expected to improve safety and the reliability of other desired highly robust applications.

[0162] reliability.

[0163] - From the perspective of transmission, data coverage may be biased.

[0164] - For example, in some cases, side coverage is not that important, and forward or rear bias or 360-degree coverage depends on the packet content / type and / or deployment scenario.

[0165] - From the perspective of the receiver, mTRPs on a vehicle may require 360-degree coverage.

[0166] - It is recommended to use two TRPs to receive packets from other UEs.

[0167]

[0168] Figure 1 : Example of data transmission using mTRP

[0169] Resource allocation based on reservation in NR sidelink

[0170] · R16 NR V2X design supports periodic and aperiodic transmissions

[0171] - Using a configurable value between 0 ms and 1000 ms, the period can be signaled in the SCI.

[0172] - Aperiodic resource reservation and signaling can be disabled through (pre)-configuration.

[0173] · Transmissions reserve resources in the current time slot and up to two future time slots.

[0174] - Reservation information is carried in the sidelink control information (SCI).

[0175] - Resource allocation is in units of subchannels in the frequency domain and limited to one time slot in the time domain.

[0176]

[0177] Figure 2 : Example of aperiodic reservation

[0178]

[0179] Figure 3 : Example of periodic reservation

[0180] HARQ feedback is introduced in the NR R16 SL design

[0181] · For better robustness enhancement, the PSFCH (Physical Sidelink Feedback Channel) is introduced in the R16 SL design. The Rx UE can feedback HARQ-ACK and / or HARQ-NACK to request potential retransmissions.

[0182] · The PSFCH can be used for both unicast and multicast, supporting 1-bit ACK / NACK.

[0183] · For multicast, there are two feedback modes

[0184] - Option 1: The receiver UE only sends NACK in a connectionless multicast mode.

[0185] - Option 2: The receiver UE sends ACK or NACK in a connection-based multicast mode.

[0186] Power Allocation for Retransmissions Using mTRP

[0187] · To achieve the desired (e.g., 360-degree) coverage, the Tx UE hopes to use different

[0188] power splitting / allocations for each TRP (re)transmission in the reserved resources.

[0189] · However, changing the power splitting / TRP selection / precoder on the TRP affects the R16 resource selection process

[0190] - The RSRP measurement based on the first transmission is no longer applicable for resource exclusion of (re)transmissions.

[0191] - This also affects the AGC's prediction of future time slots.

[0192] · In this IDF, we consider the following issues:

[0193] - A method for determining the TRP power splitting / precoder on (re)transmissions to achieve 360-degree coverage.

[0194] - A method for signaling to enable (potential) variable TRP power allocation on (re)transmissions over reserved resources.

[0195] Retransmission Power Splitting Based on Feedback RSSI / RSRP Measurements

[0196] · To achieve optimized 360-degree Rx coverage, the power splitting between TRPs for (re)transmissions over reserved resources can be:

[0197] - In one case, it can be based on HARQ feedback RSSI / RSRP measurements, as shown in Figure 4.

[0198] Figure 4 : Example of retransmission resource reservation power splitting based on feedback RSSI / RSRP measurements using mTRP (using power control to only feedback NAK);

[0199] - For the first transmission, the power allocation for each TRP is equal, which is called TCI state 1

[0200] - RSSI measurement of the feedback (HARQ-ACK / NACK) channel, as an indication of the expected Rx UE reception status. This means that forward coverage is problematic, so the positive TRP needs to be strengthened.

[0201] - The power allocation in the initial transmission is [1 1]. If the RSSI measurements of the feedback channels of each TRP are RSSI1 and RSSI2, then the retransmission power splitting ratio for retransmission is RSS1:RSS2.

[0202] Retransmission power splitting based on feedback RSSI / RSRP measurements

[0203] · Signaling of different TRP power allocations for (re)transmission on reserved resources

[0204] - For the current data transmission, indicate the control (SCI) corresponding to the current transmission for the precoder (TRP power splitting / precoder)

[0205] The first TCI state in

[0206] - The control also indicates one or more future time-frequency resource reservations for (re)transmission by the UE

[0207] - In one case, the resource reservation is for retransmission of the same packet based on blind feedback

[0208] - In one case, the resource reservation is for new packet transmission

[0209] - Indicate the set of second TCI states corresponding to the resources reserved in the current transmission, where the second TCI states of future resources each are one of the following possibilities:

[0210] - In one case, the UE knows the TCI state of the future transmission it intends to use (the same as or different from the first state) and indicates it in the current control transmission,

[0211] - In one case, the UE does not know (currently) the TCI state / TRP precoder it intends to use for future transmission (because it can be adjusted by feedback RSSI / RSRP) and is currently unknown

[0212] - In one case, this is represented as unknown

[0213] - In one case, this is represented as a set of possible TCI states that the UE may choose, but it is not clear at present (e.g., TCI state 1 or state 2 or state 3), where TCI state 1 may use two TRPs and is the same as the current transmission, TCI state 2 may have a higher feedback RSSI / RSRP measured on the previous TRP, and TCI state 3 may have a higher feedback RSSI / RSRP measured on the subsequent TRP

[0214] - In one case, this is represented as a set of possible TCI states that the UE may choose, but it is not clear at present (e.g., TCI state 1 or state 2 or state 3), where TCI state 1 may use two TRPs and is the same as the current transmission, TCI state 2 may have a higher feedback RSSI / RSRP measured on the previous TRP, and TCI state 3 may have a higher feedback RSSI / RSRP measured on the subsequent TRP

[0215] with a higher feedback RSSI / RSRP

[0216] Power / Precoder Determination Based on One or More of the Following Situations

[0217] · Case 1: Only NACK feedback + No power control

[0218] - Generally, this means that the Tx power allocation is chosen to be inversely proportional to the RSSI / RSRP to overcome path loss.

[0219] - In another scenario, there may be a nearby Rx UE and a faraway Rx UE sending NACK SFN'ed. The Tx UE may have to do some balancing allocation to account for the fact that SFN'ed NACK is used.

[0220] · Case 2: Only NACK feedback + Power control

[0221] - As Figure 4 shown, the higher the NACK RSSI / RSSP, the more serious the problem in that direction, so the higher the power allocated to that direction. · Case 3: ACK-NACK feedback + No power control

[0222] - The inverse ratio assumes that the Rx UE NACK is not SFN'ed, i.e., two Rx UEs, one proximal and one distal, send ACK / NACK on different resources.

[0223] · Case 4: ACK-NACK feedback + Power control

[0224] - The simple method of ACK and NACK RSSI / RSRP on each TRP provides more information for making power allocation decisions.

[0225] - The ACK / NACK Rx power measurement for each TRP can imply the number of ACK / NACK received from each direction.

[0226] - The higher the power allocation in the problem direction, i.e., the higher the NACK power received by the TRP.

[0227] Example

[0228] Retransmission Power Allocation Based on Feedback RSSI / RSRP Measurement

[0229] · Operation of the Tx UE

[0230] - Transmit a first transmission on multiple transmit antennas or antenna panels using a first transmit precoder on a first time-frequency (T-F) resource set, where the transmission consists of control and data transmissions.

[0231] - Indicate that a second T-F resource set is reserved for future (re)transmissions in the control,

[0232] - Receive feedback corresponding to a first transmission from one or more receivers, and measure one or more of RSRP and RSSI of the feedback signal / channel transmission of each of a plurality of transmit antennas or antenna panels available on the UE.

[0233] - Determine a second transmit precoder for transmission on one resource reserved in a second T-F resource set according to one or more measured RSRP and RSSI corresponding to the first transmission, and the determination condition may be based on one or more of Cases 1-4.

[0234] - Transmit a second transmission on one or more second T-F resources reserved in the second T-F resource set using the second transmit precoder.

[0235] - In another case, bias power allocation may also be applied to the initial transmission, such as consecutive multiple packet transmissions. That is, even in the first transmission, the TX power is not necessarily evenly distributed between the two TRPs; instead, it may be based on the past power allocation history, for example, using some low-pass filtering.

[0236] · The above operations further include

[0237] - Indicate a first TCI state in a current transmission control (SCI) corresponding to a precoder (TRP power splitting / precoder) for a first data transmission

[0238] - Indicate that the TCI state expected for transmission on the second T-F resource may be different from the current TCI state

[0239] - In one case, it is unknown at the first propagation

[0240] - In one case, indicate a set of possible TCI states for which the UE may secondarily select a TCI state for the second transmission

Claims

1. A method for wireless communication between a mobile device of a vehicle and one or more devices, the method being performed by the mobile device and the method comprising: Performing a first wireless transmission using a plurality of transmit and receive points (TRPs) of the vehicle, wherein the first wireless transmission is performed based on a first transmit power allocation among the plurality of TRPs, wherein the first wireless transmission includes sidelink control information (SCI) that indicates a first transmission configuration indicator (TCI) state associated with the vehicle and also indicates a reservation of one or more time-frequency resources for a second wireless transmission; In response to the first wireless transmission, receiving one or more feedback signals for indicating a reception state of the first wireless transmission at the one or more devices; and When the reservation is valid, performing the second wireless transmission using the plurality of TRPs based on a second transmit power allocation among the plurality of TRPs, wherein the second transmit power allocation is determined based on at least one received signal strength of the one or more feedback signals.

2. The method according to claim 1, further comprising: Determining a first received signal strength associated with a first TRP among the plurality of TRPs, the at least one received signal strength including the first received signal strength; Determining a second received signal strength associated with a second TRP among the plurality of TRPs, the at least one received signal strength further including the second received signal strength; And Adjusting the first transmit power allocation based on the first received signal strength and the second received signal strength to determine the second transmit power allocation.

3. The method according to claim 2, wherein Adjusting the first transmit power allocation includes: increasing a first power amount associated with the first TRP based on the second received signal strength exceeding the first received signal strength, decreasing a second power amount associated with the second TRP based on the second received signal strength exceeding the first received signal strength, or both.

4. The method according to claim 2, wherein The first received signal strength corresponds to a first reference signal strength indicator (RSSI) of a first feedback signal of the one or more feedback signals or a first reference signal received power (RSRP) of the first feedback signal, and wherein the second received signal strength corresponds to a second RSSI of a second feedback signal of the one or more feedback signals or a second RSRP of the second feedback signal.

5. The method according to claim 1, wherein, The one or more feedback signals include only a hybrid automatic repeat request (HARQ) negative acknowledgment (NACK) of the first wireless transmission, and the method further comprises: Determining a received power allocation of the one or more feedback signals among the plurality of TRPs; and Adjusting the first transmit power allocation inversely proportional to the received power allocation to determine the second transmit power allocation.

6. The method according to claim 1, wherein, The one or more feedback signals include only a hybrid automatic repeat request (HARQ) negative acknowledgment (NACK) of the first wireless transmission, and the method further comprises: Determine a reception power allocation of the one or more feedback signals among the plurality of TRPs; and Adjust the first transmission power allocation proportionally to the reception power allocation to determine the second transmission power allocation.

7. The method according to claim 1, wherein The one or more feedback signals include a Hybrid Automatic Repeat reQuest (HARQ) Acknowledgment (ACK) of the first wireless transmission and a HARQ Negative Acknowledgment (NACK) of the first wireless transmission, and the method further includes: Determine a reception power allocation of the one or more feedback signals among the plurality of TRPs; and Adjust the first transmission power allocation inversely proportional to the reception power allocation to determine the second transmission power allocation.

8. The method according to claim 1, wherein The one or more feedback signals include a Hybrid Automatic Repeat reQuest (HARQ) Acknowledgment (ACK) of the first wireless transmission and a HARQ Negative Acknowledgment (NACK) of the first wireless transmission, and the method further includes: Determine a reception power allocation of the one or more feedback signals among the plurality of TRPs; and Adjust the first transmission power allocation inversely proportional to the reception power allocation to determine the second transmission power allocation, wherein the adjustment includes increasing the power of the TRP assigned to receive the NACK.

9. The method according to claim 1, wherein, The one or more devices are included in or correspond to a second vehicle, and wherein the first wireless transmission and the second wireless transmission are performed via a sidelink of a vehicle-to-vehicle wireless communication network.

10. A mobile device of a vehicle for wireless communication with one or more devices, the mobile device comprising: A memory; And One or more processors coupled to the memory and configured to: Perform a first wireless transmission using the plurality of TRPs based on a first transmission power allocation among a plurality of transmit and receive points (TRPs) of the vehicle, wherein the first wireless transmission includes sidelink control information (SCI) that indicates a first Transmission Configuration Indicator (TCI) state associated with the vehicle and also indicates a reservation of one or more time-frequency resources for a second wireless transmission; In response to the first wireless transmission, receive one or more feedback signals for indicating a reception status of the first wireless transmission at the one or more devices; and When the reservation is valid, perform the second wireless transmission using the plurality of TRPs based on a second transmission power allocation among the plurality of TRPs, wherein the second transmission power allocation is determined based on at least one received signal strength of the one or more feedback signals.

11. The apparatus according to claim 10, wherein, The first TRP among the multiple TRPs is located in a first area of the vehicle, where a second TRP among the multiple TRPs is located in a second area of the vehicle different from the first area, where the first area corresponds to one of the front of the vehicle, the rear of the vehicle, the driver side of the vehicle, or the passenger side of the vehicle, and where the second area corresponds to another one of the front of the vehicle, the rear of the vehicle, the driver side of the vehicle, or the passenger side of the vehicle.

12. The apparatus according to claim 10, wherein, Retransmission for the first wireless transmission is reserved, and where the one or more processors are further configured to perform the retransmission independently of the one or more feedback signals.

13. The apparatus according to claim 10, wherein The one or more time-frequency resources are used for wireless transmission of packets not included in the first wireless transmission.

14. The device according to claim 10, wherein, The SCI further indicates one or more second TCI states of the vehicle corresponding to the one or more time-frequency resources, and where the one or more second TCI states are associated with the second wireless transmission.

15. The apparatus according to claim 10, wherein The SCI further indicates that one or more second TCI states of the vehicle will be determined subsequently or will be determined based on the one or more feedback signals subsequently.

16. The device according to claim 10, wherein, The SCI further indicates a set of candidate TCI states of the vehicle corresponding to the one or more time-frequency resources and used for the second wireless transmission.

17. The apparatus according to claim 16, wherein, The one or more processors are further configured to, after sending the SCI, select a first candidate TCI state corresponding to the first TCI state for the second wireless transmission from the set of candidate TCI states.

18. The device according to claim 16, wherein, The one or more processors are further configured to perform one of the following: After sending the SCI, based on the first received signal strength of the first feedback signal among the one or more feedback signals exceeding the second received signal strength of the second feedback signal among the one or more feedback signals, select a second candidate TCI state for the second wireless transmission from the set of candidate TCI states; Or After sending the SCI, based on the first received signal strength being less than the second received signal strength, select a third candidate TCI state for the second wireless transmission from the set of candidate TCI states.

19. The apparatus according to claim 10, further comprising a plurality of precoders of the vehicle, wherein, The one or more processors are further configured to select a first set of precoders for the first wireless transmission from the multiple precoders, and where the one or more processors are further configured to select a second set of precoders for the second wireless transmission from the multiple precoders.

20. The apparatus according to claim 10, further comprising: A first antenna or a first antenna panel of the vehicle, configured to perform the first wireless transmission; And A second antenna or a second antenna panel of the vehicle, configured to perform the second wireless transmission.

21. The apparatus according to claim 10, wherein, The first transmit power allocation corresponds to a balanced transmit power allocation among the multiple TRPs.

22. The apparatus according to claim 10, wherein, The first transmit power allocation corresponds to a biased power allocation selected based on a transmit power allocation history associated with the vehicle.

23. The apparatus according to claim 10, wherein, The first wireless transmission is performed based on a first transmission configuration indicator (TCI) state and indicates reservation of one or more time-frequency resources, and wherein the second wireless transmission is performed based on a second TCI state different from the first TCI state and using the one or more time-frequency resources when the reservation is valid.

24. A mobile device of a vehicle for wireless communication with one or more devices, the mobile device comprising: A unit for performing a first wireless transmission using a plurality of transmit and receive points (TRPs) of the vehicle, wherein the first wireless transmission is performed based on a first transmit power allocation among the plurality of TRPs, wherein the first wireless transmission includes sidelink control information (SCI) that indicates a first transmission configuration indicator (TCI) state associated with the vehicle and also indicates reservation of one or more time-frequency resources for a second wireless transmission; A unit for receiving, in response to the first wireless transmission, one or more feedback signals for indicating a reception state of the first wireless transmission at the one or more devices; and A unit for performing the second wireless transmission using the plurality of TRPs based on a second transmit power allocation among the plurality of TRPs when the reservation is valid, wherein the second transmit power allocation is determined based on at least a received signal strength of the one or more feedback signals.

25. A method for wireless communication between a device and a mobile device of a vehicle, the method being performed by the device and comprising: Receiving, by the device, a first wireless transmission performed by a plurality of transmit and receive points (TRPs) of the vehicle based on a first transmit power allocation among the plurality of TRPs, wherein the first wireless transmission includes sidelink control information (SCI) that indicates a first transmission configuration indicator (TCI) state associated with the vehicle and also indicates reservation of one or more time-frequency resources for a second wireless transmission; Sending, in response to the first wireless transmission, a feedback signal for indicating a reception state of the first wireless transmission at the device; and Receiving, by the device, the second wireless transmission performed by the plurality of TRPs based on a second transmit power allocation among the plurality of TRPs when the reservation is valid, wherein the second transmit power allocation is based on a received signal strength of the feedback signal.

26. The method according to claim 25, wherein, The device is included in or corresponds to a second vehicle, and wherein the first wireless transmission and the second wireless transmission are performed via a sidelink of a vehicle-to-vehicle wireless communication network.

27. The method according to claim 25, wherein The reservation is for retransmission of the first wireless transmission, and the method further comprises: performing the retransmission independently of the feedback signal.

28. The method according to claim 25, wherein, The one or more time-frequency resources are used for wireless transmission of packets not included in the first wireless transmission.

29. The method according to claim 25, wherein, The SCI also indicates one or more second TCI states of the vehicle corresponding to the one or more time-frequency resources, and wherein the one or more second TCI states are associated with the second wireless transmission.

30. The method according to claim 25, wherein, The SCI also indicates that one or more second TCI states of the vehicle will be determined subsequently or will be determined subsequently based on the feedback signal.

31. The method according to claim 25, wherein The SCI also indicates a set of candidate TCI states of the vehicle corresponding to the one or more time-frequency resources and for the second wireless transmission.

32. The method according to claim 25, wherein The first transmit power allocation corresponds to a balanced transmit power allocation among the plurality of TRPs.

33. An apparatus for wireless communication with a mobile device of a vehicle, the apparatus comprising: a memory; and one or more processors coupled to the memory and configured to: receive a first wireless transmission performed by a plurality of transmit and receive points (TRPs) of the vehicle based on a first transmit power allocation among the plurality of TRPs, wherein the first wireless transmission includes sidelink control information (SCI), the SCI indicating a first transmission configuration indicator (TCI) state associated with the vehicle and also indicating a reservation of one or more time-frequency resources for a second wireless transmission; in response to the first wireless transmission, transmit a feedback signal for indicating a reception state of the first wireless transmission; and when the reservation is valid, receive the second wireless transmission performed by the plurality of TRPs based on a second transmit power allocation among the plurality of TRPs, wherein the second transmit power allocation is based on a received signal strength of the feedback signal.

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