CN114071587A

CN114071587A - Enhanced mechanism for sidelink resource allocation

Info

Publication number: CN114071587A
Application number: CN202110821034.7A
Authority: CN
Inventors: 陈滔; 蔡隆盛
Original assignee: MediaTek Singapore Pte Ltd
Current assignee: MediaTek Singapore Pte Ltd
Priority date: 2020-08-07
Filing date: 2021-07-20
Publication date: 2022-02-18
Also published as: WO2022027588A1

Abstract

Various examples and schemes relating to enhancement of Sidelink (SL) resource allocation in New Radio (NR) vehicle networking (V2X) communications are described. A User Equipment (UE) transmits assistance information regarding a sensing result of one or more resources reserved for SL communication to a peer UE. The UE then receives a transmission from the peer UE on a resource selected by the peer UE based on the assistance information. The method and the device for allocating the sidelink resources can improve the reliability of sidelink communication and reduce the whole delay.

Description

Enhanced mechanism for sidelink resource allocation

Technical Field

The present invention generally relates to wireless communications. In particular, it relates to an enhanced mechanism for Sidelink (SL) resource allocation (resource allocation).

Background

Unless otherwise indicated, the approaches described in this section are not prior art to the claims set forth below and are not admitted to be prior art by inclusion in this section.

Under 3 rd generation partnership project (3GPP) specifications for 5 th generation (5G) NR, vehicle-to-advertising (V2X) SL communications may be conducted through unicast, multicast, and broadcast communications. However, there are still some problems to be solved in SL resource allocation for improving reliability and reducing SL communication delay. Therefore, a solution is needed to enhance SL resource allocation.

Disclosure of Invention

The following summary is illustrative only and is not intended to be in any way limiting. That is, the following summary is provided to introduce concepts, points, benefits and advantages of the novel and non-obvious techniques described herein. Selected embodiments are further described below in the detailed description. Thus, the following summary is not intended to identify essential features of the claimed subject matter, nor is it intended for use in determining the scope of the claimed subject matter.

It is an object of the present invention to propose various schemes, concepts, designs, methods, systems and arrangements related to an enhanced mechanism for SL resource allocation. Various schemes proposed herein may provide enhanced mechanisms for SL resource allocation as one solution to particular problems in V2X communications.

In one aspect, a method may include sending assistance information to a peer User Equipment (UE) regarding sensing results for one or more resources reserved for SL communication. The method may also include receiving a transmission from the peer UE on a resource selected by the peer UE based on the assistance information.

In another aspect, a method may include receiving assistance information from a peer UE regarding sensing results of one or more resources reserved for SL communication. The method may also include performing a transmission to the peer UE on a resource selected based on the assistance information.

In another aspect, an apparatus may include a transceiver and a processor coupled to the transceiver. The transceiver may be configured to communicate wirelessly in a V2X network. The processor may be configured to transmit, via the transceiver, to the peer UE, assistance information regarding a result of the sensing of the one or more resources reserved for SL communication. The processor may be further configured to receive, via the transceiver, a transmission from the peer UE on a resource selected by the peer UE based on the assistance information.

In another aspect, an apparatus may include a transceiver and a processor coupled to the transceiver. The transceiver may be configured to communicate wirelessly in a V2X network. The processor may be configured to receive, via the transceiver, assistance information from a peer UE regarding a sensing result of one or more resources reserved for SL communication. The processor may be further configured to perform, via the transceiver, a transmission to the peer UE on a resource selected based on the assistance information.

The method and the device for allocating the sidelink resources can improve the reliability of sidelink communication and reduce the whole delay.

It is noted that although the description provided herein is in the context of specific radio access technologies, networks and network topologies such as the fifth generation (5G) and NR V2X, the proposed concepts, schemes and any variants/derivations thereof may be implemented in, for and by any other type of radio access technology, network and network topology, such as, but not limited to, Long-Term Evolution (LTE), LTE-Advanced (LTE-Advanced), LTE-Advanced-release (LTE-Advanced Pro), wireless fidelity (Wi-Fi), and any future-developed networks and technologies. Accordingly, the scope of the invention is not limited to the examples described herein.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is to be understood that the figures are not necessarily to scale, some components shown may be shown to scale beyond the dimensions in actual implementations, in order to clearly illustrate the concepts of the present invention.

FIG. 1 is an exemplary scenario diagram according to an embodiment of the present invention.

Fig. 2 is a block diagram of an exemplary communication environment in accordance with an embodiment of the present invention.

FIG. 3 is a flow diagram of an example process in accordance with an embodiment of the present invention.

FIG. 4 is a flow diagram of an example process in accordance with an embodiment of the present invention.

Detailed Description

Detailed examples and embodiments of the claimed subject matter are disclosed herein. However, it is to be understood that the disclosed embodiments and implementations are merely illustrative of the claimed subject matter, which can be embodied in various forms. This invention may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments and implementations set forth herein. Rather, the various exemplary embodiments and implementations are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. In the following description, details of well-known features and techniques may be omitted to avoid unnecessarily obscuring the presented embodiments and implementations.

SUMMARY

Embodiments of the present invention relate to various techniques, methods, schemes and/or solutions for SL resource allocation enhancement in NR V2X communications. According to the invention, a plurality of possible solutions are implemented separately or in combination. That is, although these possible solutions are described separately below, two or more of these possible solutions may also be implemented in combination or in another manner.

Under the proposed scheme for SL resource allocation according to the present invention, a receiving end (Rx) User Equipment (UE) assisted resource allocation mechanism can be applied to improve the reliability of SL communication and reduce the overall delay. This Rx UE assisted resource allocation mechanism may be implemented or used alone or with peer to peer transmit end (Tx) UE based sensing and resource allocation mechanisms. Under the proposed scheme, the Rx UE may autonomously send (e.g., by broadcast, unicast, or multicast) feedback information (interchangeably referred to herein as "assistance information") to a peer Tx UE (also referred to herein as "Tx UE"), or the Rx UE may trigger the Rx UE to send (e.g., by broadcast, unicast, or multicast) the assistance information upon receiving a transmission of Sidelink Control Information (SCI) and/or data from the Tx UE.

The assistance information sent by the Rx UE as feedback to the Tx UE may carry resource sensing information from the Rx UE, Channel State Information (CSI), observed doppler/delay/mobility related information (which may relate to absolute velocity or relative velocity between the Tx UE and the Rx UE), and/or multiple-input multiple-output (MIMO) related feedback information, thereby assisting the Tx UE in performing resource, Modulation and Coding Scheme (MCS), MIMO, and/or demodulation reference signal (DMRS) mode selection operations. The resource sensing information may comprise preferred or non-preferred (denoted herein as "(non-) preferred") time and/or frequency resources based on the sensing operations performed by the Rx UEs. The sensing operation on the Rx UE side is similar to that on the Tx UE side. That is, the Rx UE may perform a sensing operation on the Rx resource pool for reception (or the Tx resource pool for performing transmission by the peer Tx UE) by measuring Reference Signal Received Power (RSRP) according to SCIs of other UEs on the detected resource pool.

Under the proposed scheme, the Tx UE may signal the Rx resource pool for sensing (or Tx resource pool for transmission by the Tx UE) to the Rx UE so that the Rx UE may provide the sensing result to assist the Tx UE in resource selection or reselection (denoted herein as "(re-) selection"). Alternatively, the resource pool to be sensed may be configured or preconfigured (denoted herein as "(pre-) configured"), and in this case no signalling from the Tx UE to the Rx UE is required.

Based on a number of factors, including: the Rx UE may determine whether the resources reserved for the peer Tx UE are preferred from the perspective of the Rx UE, thereby avoiding the hidden node problem. Here, the transmission priority of the peer Tx UE may be determined according to the priority indicated in the SCI, or the (pre-) configured priority of the Media Access Control (MAC) flow or the link pair between the Rx UE and the Tx UE. When sensing is performed, the sensed priority of the UE may be obtained from SCIs of other UEs as the priority detected by the Rx UE. To facilitate Rx UE decision, the RSRP threshold may be set according to a combination of the transmission priority of the peer Tx UE and the sensed transmission priority of the UE. The Rx UE may compare the measured RSRP of the sensed control DMRS transmission and/or data DMRS transmission of the Tx UE to an RSRP threshold to determine whether the reserved resources are preferred/non-preferred or acceptable or unacceptable (denoted herein as "(not) acceptable"). For example, in case the measured RSRP is below the RSRP threshold, the reserved resources may be determined to be acceptable or preferred. Otherwise, in case the measured RSRP is above the RSRP threshold, the reserved resources may be determined to be unacceptable or non-preferred.

In addition to the (non-) preferred/(non-) acceptable resources determined based on the resource sensing results, the Rx UE may also provide CSI information to the Tx UE in feedback. Such CSI information may correspond to preferred/acceptable (reserved) resources that may be used for MCS selection once the resources are used by the Tx UE. In addition, doppler/delay/mobile velocity related information or a preferred DMRS pattern observed from the perspective of the Rx UE may be carried in the assistance information so that the Tx UE may select a suitable DMRS pattern (e.g., a certain number of DMRS symbols in one time slot) for transmission.

Under the proposed scheme according to the present invention, preferably, the Rx UE transmits the assistance information to the Tx UE some time before the Tx UE performs transmission on the one or more reserved Tx resources. Upon receiving the assistance information, the Tx UE may consider the assistance information when performing resource reselection and/or resource utilization. Furthermore, the Rx UE may obtain information about the reserved Tx resources based on the SCI received from the Tx UE, and according to this information, the Rx UE may determine the feedback timing based on the time instants for transmission on the reserved Tx resources, taking into account, of course, the extra time for the Tx UE to process the assistance information. Accordingly, the Rx UE may update to the Tx UE with the latest assistance information, e.g., updated feedback information based on the determined feedback timing for transmitting the assistance information. That is, the Rx UE may continue to update the assistance information until a certain feedback timing to transmit the assistance information to the Tx UE.

Under the proposed scheme, the Rx UE may perform partial sensing (e.g., periodic sensing or aperiodic one-time sensing) or full sensing to determine the preference and/or acceptability of reserved resources. The Rx UE then sends assistance information before the peer Tx UE transmits on the reserved resources or before (re) selection or re-evaluation for the reserved resources. In case of multiple available or eligible resources for transmitting assistance information, the resource closest to the re-evaluation time of the reserved resource indicated by the Tx UE in the SCI (optionally also taking into account the additional assistance information processing time) may be preferentially selected in order to send the latest assistance information to the Tx UE to facilitate efficient resource (re) selection or re-evaluation. For example, the latest time for Rx UE to transmit assistance information to Tx UE may be the time to reserve resources minus the sum of the processing time for Tx UE re-evaluation/reselection and the processing time for Tx UE to receive and parse assistance information. The Rx UE may (re) select resources for transmitting assistance information using the transmission time of the reserved resources indicated in the SCI as a packet delay budget. Alternatively, the latest transmission time of the side information (e.g. the packet delay budget of the side information) may be derived or (pre-) configured based on the time the resources are reserved and the duration (e.g. required processing time) indicated in the SCI. For example, the latest time (or packet delay budget) of the secondary information transmission may be equal to the time the resource is reserved minus a duration, wherein the duration includes the processing time of the Tx UE. In the case where such processing time is UE-specific, the peer Tx UE may indicate the processing time in the SCI. Otherwise, in the case of generic processing time, the processing time is (pre-) configured and exchanged between UEs, either by signaling (e.g., PC5 Radio Resource Control (RRC) signaling) or specified in the specification.

Under the proposed scheme according to the present invention, the transmission priority of the assistance information indicated in the SCI may be set to a (pre-) configured priority or a priority corresponding to the transmission of trigger assistance information from the SCI of the peer Tx UE. In the case where the peer Tx UE reserves multiple resources in the SCI, the assistance information corresponding to each reserved resource is transmitted before transmission on the reserved resource.

Notably, the assistance information carries the latest feedback information to assist the Tx UE. In case of reselecting a resource for transmitting auxiliary information, the content of the auxiliary information may be updated according to the latest information prior to the time of the reselected resource for transmitting auxiliary information. The processing time to update the assistance information at the Rx UE before transmission may be considered. That is, the assistance information is updated based on the latest information at or before the time derived from the time (re) selected for assistance information transmission and the corresponding processing time at the Rx UE. For example, the time instant may be equal to the time (re) selected for assistance information transmission minus the processing time at the Rx UE.

Under the proposed scheme according to the present invention, the side information can be carried in a separate SCI with or without a physical sidelink shared channel (psch). Alternatively, the assistance information may also be carried in the psch, especially when there is traffic (e.g., data) transmitted in the psch. In some cases, the second SCI of the two-stage SCIs may be used to carry the assistance information with a field indicating whether the assistance information is carried in the second SCI and/or whether the assistance information is carried in the second SCI with or without a data channel (e.g., psch).

Under the proposed scheme according to the present invention, the resources for transmitting the assistance information (carried in the second SCI, the psch or any feedback channel) can be implicitly and/or explicitly derived from the SCI received by the peer Tx UE. For example, resources may be determined based on a function of Tx UE Identification (ID) and/or Rx UE ID in a (pre) configured set of resources (e.g., a set of time resources and/or frequency resources). Since the link pair or Tx/Rx UE ID is unique, the frequency resources used for the transmission of the assistance information may be unique or different from the frequency resources of the other link pairs. The time to reserve resources may be a function of the time to reserve resources indicated in the SCI. For example, the reserved resource time may be a time offset (e.g., derived/indicated in the SCI described above) from the time of the reserved resource or the reevaluation time of the reserved resource, taking into account the processing time of the Tx UE. The time offset may be fixed, indicated in the SCI or (pre-) configured. Furthermore, a time offset may be (pre-) configured for each resource pool. Accordingly, the Rx UE may determine the time/frequency resources in the (pre-) configured set of resources based on the SCI received from the Tx UE, wherein the SCI is used for transmission of the assistance information carried in the second SCI, the psch or any (feedback) channel. Advantageously, such explicit signaling or implicit reasoning for resource determination can help avoid sensing and resource selection processes for assistance information transmission.

Under the scheme proposed in accordance with the present invention, in order to further reduce the signaling overhead of Rx UE-assisted resource allocation, instead of transmitting all sensing results to the Tx UE, the Rx UE may transmit the top N results of a plurality of sensing results (or CSI information) ordered according to a preference, wherein the preference may be measured by priority or RSRP. The value of N may be configurable or predetermined. For example, the Rx UE may provide information related to only three resources (N-3) having the highest RSRP.

Fig. 1 depicts an example scenario 100 under various proposed schemes involving the transmission of assistance information from an Rx UE to a peer Tx UE. In stage 1, after receiving an SCI from a peer Tx UE at time m', the Rx UE may be triggered to perform resource selection within a selection window for transmitting assistance information, e.g., during the sensing window, based on sensing (e.g., partial sensing or full sensing) performed by the Rx UE in the past. It is noted that the Rx UE may sense the Tx resource pool of the peer Tx UE for the generation of the auxiliary information, or may sense the Tx resource pool of the Rx UE for the transmission of the auxiliary information. The Tx resource pool of the peer Tx UE may be (pre-) configured for Rx UE or indicated by PC-5RRC signaling exchange between Rx UE and peer Tx UE. However, this may impose limitations on the Tx resource pool for transmission at the Tx UE. The SCI received at the first time instant m' may indicate the resources reserved at the second time instant m ″ (and the processing time T _ proc). The Rx UE may attempt to select one or more resources to transmit assistance information near a time instant (m "-T _ proc), which may be at or before a reevaluation time for reserving resources at m". In phase 2, the Rx UE may send the assistance information carrying the latest information on the selected resources of n (≦ m "-T _ proc). In phase 3, the peer Tx UE may re-evaluate the reserved resources at m ″ based on its sensing results and the assistance information from Rx UE. The assistance information may indicate whether reserved resources at m "are preferred or acceptable. The assistance information may also indicate CSI information of the reserved resources and/or CSI information of other preferred resources from the perspective of the Rx UE from sensing and measurements performed by the Rx UE, in case the reserved resources are acceptable. The assistance information may further indicate a preferred DMRS pattern or doppler-related information for the Tx UE to select a suitable DMRS pattern.

In summary, the emphasis of the various proposed solutions is summarized below.

With respect to the Rx UE-assisted resource allocation mechanism, the Rx UE may provide assistance information to the Tx UE at some time before (e.g., immediately before) the time the Tx UE uses to transmit reserved resources to be used. The Rx UE may acquire information of the reserved Tx resources from the SCI received from the Tx UE and thus determine the feedback timing based on the time instant of transmission on the reserved Tx resources by considering the additional time for the Tx UE to process the assistance information.

For assistance information, the Rx UE may transmit the latest assistance information (e.g., updated feedback information) based on the transmission timing of the assistance information.

Regarding the resource pool for sensing, the Tx UE may inform the Rx UE of the resource pool for sensing (or the resource pool for Tx UE transmission) through signaling so that the Rx UE may provide the sensing result to assist the resource (re) selection of the Tx UE. Alternatively, such resource pools may be (pre-) configured, and thus no signalling is required.

Regarding the decision of resource preference or acceptance, the Rx UE may determine whether the resources reserved by the Tx UE are preferred or acceptable. This determination may be based on one or more of a number of factors, including, for example and without limitation, measured RSRP, transmission priority of the Tx UE, sensed priority of the UE, and corresponding resources reserved by the SCI from the Tx UE. In particular, the Rx UE may compare the measured RSRP of the sensed control and/or data DMRS transmission from the Tx UE to an RSRP threshold to determine whether the reserved resources are preferred or acceptable. The determined preference or non-preference for reserved resources may be indicated in the assistance information sent by the Rx UE to the Tx UE. Upon receiving the assistance information from the Rx UE, the Tx UE may select and use resources according to the sensing result of the Tx UE itself and the assistance information (including the sensing result of the Rx UE) or based only on the assistance information. Alternatively, upon receiving the assistance information from the Rx UE, the Tx UE may reselect resources based on the assistance information.

Illustrative embodiments

Fig. 2 illustrates an example communication environment 200 having an example apparatus 210 and an example apparatus 220, in accordance with an embodiment of the present invention. Each of the devices 210 and 220 may perform various functions to implement the schemes, techniques, procedures and methods related to SL resource allocation enhancement in NR V2X communications, including the various above-described schemes described below in the procedures below.

Each of the device 210 and the device 220 may be part of an electronic device, which may be a UE such as a vehicle, a portable or mobile device, a wearable device, a wireless communication device, or a computing device. For example, each of apparatus 210 and apparatus 220 may be implemented in a vehicle, a smartphone, a smartwatch, a personal digital assistant, a digital camera, or a computing device such as a tablet computer, laptop computer, or notebook computer. Each of the devices 210 and 220 may also be part of a machine type device, and may be an IoT or NB-IoT device such as a fixed or static device, a home device, a wired communication device, or a computing device. For example, each of the devices 210 and 220 may be implemented in a smart thermostat, a smart refrigerator, a smart door lock, a wireless speaker, or a home control center. In some embodiments, each of the devices 210 and 220 may also be implemented in one or more Integrated Circuit (IC) chips, such as, but not limited to, one or more single-core processors, one or more multi-core processors, or one or more Complex-Instruction-Set-Computing (CISC) processors. Each of the devices 210 and 220 includes at least some of the components shown in fig. 2, e.g., processor 212 and processor 222, respectively. Each of the apparatus 210 and the apparatus 220 may further comprise one or more other components (e.g., an internal power supply, a display device, and/or a user interface device) that are not relevant to the proposed solution of the present invention, but for simplicity and brevity such other components of the apparatus 210 and the apparatus 220 are not depicted in fig. 2 nor described below.

In many embodiments, at least one of the devices 210 and 220 may be part of an electronic device, which may be a vehicle, a Road Side Unit (RSU), a network node or base station (e.g., eNB, gNB, TRP), a small cell, a router, or a gateway. For example, at least one of the apparatus 210 and the apparatus 220 may be implemented as a vehicle in a V2X or V2X network, an eNodeB of an LTE, LTE-Advanced (LTE-Advanced) or LTE-Advanced-Pro (LTE-Advanced Pro) network, or a gNB of a 5G, NR, IoT, or NB-IoT network. Alternatively, at least one of apparatus 210 and apparatus 220 may be implemented in one or more IC chips, such as, but not limited to, one or more single-core processors, one or more multi-core processors, or one or more CISC processors.

In an aspect, each of processor 212 and processor 222 may be implemented in the form of one or more single-core processors, one or more multi-core processors, or one or more CISC processors. That is, even though the singular term "processor" is used herein to refer to both the processor 212 and the processor 222, each of the processor 212 and the processor 222 may include multiple processors in some embodiments and a single processor in other embodiments in accordance with the present invention. In another aspect, each of the processors 212 and 222 may be implemented in hardware (and, optionally, firmware) with electronic components that may include, for example, without limitation, one or more transistors, one or more diodes, one or more capacitors, one or more resistors, one or more inductors, one or more memristors, and/or one or more varactors configured and arranged in accordance with certain objectives of the present disclosure. In other words, in accordance with the various described embodiments of the invention, at least in some embodiments, each of the processor 212 and the processor 222 may be dedicated machines specifically designed, configured and arranged to perform specific tasks including SL resource allocation enhancements in NR V2X communications in accordance with various embodiments of the present invention.

In some embodiments, the device 210 may further include a transceiver 216 coupled to the processor 212 as a communication device, and the transceiver 216 may be capable of wirelessly transmitting and receiving data. In some embodiments, the device 210 may further include a memory 214 coupled to the processor 212 and accessible to the processor 212 and storing data therein. In some embodiments, the device 220 may also include a transceiver 226 coupled to the processor 222 as a communication device, and the transceiver 226 may be capable of wirelessly transmitting and receiving data. In some embodiments, the apparatus 220 may further include a memory 224 coupled to the processor 222 and accessible to the processor 222 and storing data therein. Thus, devices 210 and 220 may communicate wirelessly with each other via transceiver 216 and transceiver 226, respectively.

To facilitate a better understanding, the following description of the operation, functionality, and capabilities of each of the apparatus 210 and the apparatus 220 is provided in the context of an NR V2X communication environment, wherein the apparatus 210 is embodied or embodied as a wireless communicator, a communicator, or a first UE (which may be an Rx UE or a peer Tx UE in scenario 100), and the apparatus 220 is embodied or embodied as a wireless communicator, a communicator, or a second UE (which may be a peer Tx UE or an Rx UE in scenario 100).

Under various proposals relating to SL resource allocation enhancements in NR V2X communications according to the present invention, processor 212 of device 210, which is an Rx UE, may send via transceiver 216 to a peer UE (e.g., device 220, which is a peer Tx UE) assistance information regarding the results of sensing of one or more reserved resources for SL communications. Further, the processor 212 may receive, via the transceiver 216, a transmission from the peer UE on a resource selected by the peer UE based on the assistance information.

In some embodiments, the assistance information may indicate a preference or non-preference of the peer UE to use one or more reserved resources in performing the transmission.

In some implementations, the processor 212 may perform additional operations. For example, processor 212 may determine the preference or non-preference based on one or more of RSRP measured on each of the one or more resources, transmission priority of the peer UE, priority of one or more other sensed UEs, and one or more corresponding resources reserved by SCI signaling from the peer UE. In some embodiments, in determining the preference or non-preference, the processor 212 may compare the measured RSRP of the DMRS transmissions of one or more other sensed UEs to an RSRP threshold.

In some embodiments, the processor 212 may transmit the assistance information a period of time before the time at which the peer UE performs the transmission when transmitting the assistance information. In some embodiments, the period of time may include at least a processing time used by the peer UE in processing the assistance information.

In some implementations, the processor 212 may perform certain operations while transmitting the assistance information. For example, the processor 212 may determine the feedback timing for transmitting the assistance information based on a time at which the peer UE performs transmission and a processing time used by the peer UE in processing the assistance information. Further, the processor 212 may update the assistance information until the assistance information is transmitted at the feedback timing.

In some implementations, the processor 212 may perform additional operations. For example, processor 212 may receive SCI signaling from the peer UE. Further, processor 212 may obtain information regarding one or more reserved resources from the SCI.

In some implementations, the processor 212 may perform other additional operations. For example, the processor 212 may determine one or more resource pools. Further, processor 212 may perform sensing on the one or more resource pools to measure RSRP of each resource in the one or more resource pools to provide a sensing result. In some implementations, the one or more resource pools include one or both of an Rx resource pool for performing receive operations and a Tx resource pool used by the peer UE for performing transmissions. In some embodiments, in determining the one or more resource pools, the processor 212 may perform any of the following: (a) receiving signaling indicating one or more resource pools from a peer UE; (b) one or more resource pools are determined based on the configured or preconfigured information.

Under various proposals relating to SL resource allocation enhancements in NR V2X communications according to the present invention, processor 222 of device 220, which is a Tx UE, may receive, via transceiver 226, assistance information regarding the results of sensing of one or more resources reserved for SL communications from a peer UE (e.g., device 210, which is an Rx UE). Further, the processor 222 may perform transmission to the peer UE on a resource selected based on the assistance information via the transceiver 226.

In some embodiments, the assistance information may indicate a preference or non-preference of the peer UE with respect to one or more reserved resources used in performing the transmission.

In some implementations, the processor 222 may perform certain operations while performing the transmission. For example, the processor 222 may perform sensing on the Tx resource pool to provide a sensing result. In addition, the processor 222 may select a resource from the Tx resource pool based on the sensing result and the auxiliary information.

In some embodiments, in performing the transmitting, the processor 222 may perform: (a) selecting a resource from the Tx resource pool based on the side information; or (b) reselect resources from a different pool of Tx resources based on the assistance information.

Illustrative procedures

Fig. 3 is an exemplary process 300 shown in accordance with an embodiment of the present invention. Flow 300 may be an exemplary embodiment of the proposed scheme for SL resource allocation enhancement in NR V2X communications in accordance with the present invention. The process 300 may represent aspects of a feature implementation of the apparatus 210 and the apparatus 220. The process 300 may include one or more of the actions, or functions illustrated by one or more of the

blocks

310, 320. Although illustrated as discrete, blocks may be split into more blocks, combined into fewer blocks, or portions thereof in process 300, depending on the desired implementation. Further, the blocks of the process 300 may be performed in the order shown in fig. 3, or, alternatively, may be performed in a different order. The process 300 may also be repeated in part or in whole. Device 210, device 220, and/or any suitable wireless communication device, UE, road side unit (RUS), base station, or machine type device may implement process 300. For purposes of illustration only and not to limit scope, flow 300 is described below in the context of device 210 as a first UE (e.g., Rx UE or Tx UE in a V2X network) and device 220 as a second UE (e.g., Tx UE or Rx UE in a V2X network). The flow 300 may begin at block 310.

At block 310, flow 300 may include processor 212 of device 210 as an Rx UE sending, via transceiver 216, to a peer UE (e.g., device 220 as a peer Tx UE), assistance information regarding a sensing result of one or more resources reserved for SL communication. Flow 300 may proceed from block 310 to block 320.

At block 320, the flow 300 may include the processor 212 receiving, via the transceiver 216, a transmission from the peer UE on a resource selected by the peer UE based on the assistance information.

In some embodiments, the process 300 may include the processor 212 performing additional operations. For example, flow 300 may include processor 212 determining the preference or non-preference based on one or more of RSRP measured on each of the one or more resources, a transmission priority of the peer UE, one or more other sensed priorities of the UE, and one or more corresponding resources reserved by SCI signaling from the peer UE. In some embodiments, in determining a preference or non-preference, flow 300 may include processor 212 comparing a measured RSRP of DMRS transmissions of one or more other sensed UEs to an RSRP threshold.

In some embodiments, when sending the assistance information, the flow 300 may include the processor 212 sending the assistance information a period of time before the time the peer UE performs the transmission. In some embodiments, the period of time may include at least a processing time used by the peer UE in processing the assistance information.

In some embodiments, the process 300 may include the processor 212 performing certain operations in transmitting assistance information. For example, flow 300 may include processor 212 determining a feedback timing for sending assistance information based on a time at which the peer UE performs the transmission and a processing time used by the peer UE in processing the assistance information. Further, the flow 300 may include the processor 212 updating the assistance information until the assistance information is sent at the feedback timing.

In some embodiments, the process 300 may include the processor 212 performing additional operations. For example, flow 300 may include processor 212 receiving SCI signaling from the peer UE. Further, flow 300 may include processor 212 obtaining information regarding one or more reserved resources from the SCI.

In some embodiments, the process 300 may include the processor 212 performing other additional operations. For example, the process 300 may include the processor 212 determining one or more resource pools. Further, flow 300 may include processor 212 performing sensing on the one or more resource pools to measure RSRP of each resource of the one or more resource pools to provide a sensing result. In some implementations, the one or more resource pools include one or both of an Rx resource pool for performing receive operations and a Tx resource pool used by the peer UE for performing transmissions. In some embodiments, in determining the one or more resource pools, the process 300 may include the processor 212 performing any of the following: (a) receiving signaling indicating one or more resource pools from a peer UE; (b) one or more resource pools are determined based on the configured or preconfigured information.

Fig. 4 is an exemplary flow chart 400 shown in accordance with an embodiment of the present invention. Flow 400 may be an exemplary embodiment of the proposed scheme for SL resource allocation enhancement in NR V2X communications in accordance with the present invention. The process 400 may represent aspects of a feature implementation of the apparatus 210 and the apparatus 220. The process 400 may include one or more of the actions, acts or functions illustrated by one or more of the blocks 410, 420. Although illustrated as discrete blocks, the blocks in flow 400 may be split into more blocks, combined into fewer blocks, or portions thereof, depending on the desired implementation. Further, the blocks of the process 400 may be performed in the order shown in fig. 4, or, alternatively, may be performed in a different order. The process 400 may also be repeated in part or in whole. Device 210, device 220, and/or any suitable wireless communication device, UE, road side unit (RUS), base station, or machine type device may implement flow 400. For purposes of illustration only and not to limit scope, flow 400 is described below in the context of device 210 as a first UE (e.g., Rx UE or Tx UE in a V2X network) and device 220 as a second UE (e.g., Tx UE or Rx UE in a V2X network). The flow 400 may begin at block 410.

At block 410, flow 400 may include processor 222 of device 220 as a Tx UE receiving, via transceiver 226, assistance information from a peer UE (e.g., device 210 as an Rx UE) regarding sensing results of one or more resources reserved for SL communication. From block 410, the flow 400 may proceed to block 420.

At block 420, the flow 400 may include the processor 222 performing, via the transceiver 226, a transmission to the peer UE on a resource selected based on the assistance information.

In some embodiments, the flow 400 may include the processor 222 performing certain operations while performing the transmission. For example, flow 400 may include processor 222 performing sensing on the pool of Tx resources to provide a sensing result. Additionally, the flow 400 may include the processor 222 selecting a resource from the Tx resource pool based on the sensing result and the assistance information.

In some embodiments, when performing the transmitting, the process 400 may include the processor 222 performing: (a) selecting a resource from the Tx resource pool based on the side information; or (b) reselect resources from a different pool of Tx resources based on the assistance information.

Additional description

The subject matter described herein sometimes illustrates different components contained within, or connected with, different other components. It is to be understood that such depicted architectures are merely examples, and that in fact many other architectures can be implemented which achieve the same functionality. In a conceptual sense, any arrangement of components to achieve the same functionality is effectively "associated" such that the desired functionality is achieved. Hence, any two components herein combined to achieve a particular functionality can be seen as "associated with" each other such that the desired functionality is achieved, irrespective of architectures or intermedial components. Likewise, any two components so associated can also be viewed as being "operably connected," or "operably coupled," to each other to achieve the desired functionality, and any two components capable of being so associated can also be viewed as being "operably connected," to each other to achieve the desired functionality. Specific examples of operatively couplable include but are not limited to physically mateable and/or physically interacting components and/or wirelessly interactable and/or wirelessly interacting components and/or logically interacting and/or logically interactable components.

Furthermore, to the extent that any plural and/or singular terms are used herein, those having ordinary skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. For clarity, various singular/plural reciprocity may be explicitly set forth herein.

Furthermore, those of ordinary skill in the art will understand that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims), generally mean "open" terms, e.g., the term "including" should be interpreted as "including but not limited to," the term "having" should be interpreted as "having at least," the term "includes" should be interpreted as "includes but is not limited to," etc. It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases "at least one" and "one or more. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles "a" or "an" limits any particular claim containing such introduced claim recitation to embodiments containing only one such recitation, even when the same claim includes the introductory phrases "one or more" or "at least one" and indefinite articles such as "a" or "an," e.g., "a and/or" an "should be interpreted to mean" at least one "or" one or more, "which applies equally to the use of definite articles used to introduce a claim recitation. Furthermore, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should be interpreted to mean at least the recited number, e.g., the bare recitation of "two recitations," without other modifiers, means at least two recitations, or two or more recitations. Further, where a convention analogous to "at least one of A, B and C, etc." is used, in general such a construction is intended in the sense one having ordinary skill in the art would understand the convention (e.g., "a system having at least one of A, B and C" would include but not be limited to systems that have a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B and C together, etc.). Where a convention analogous to "A, B or at least one of C, etc." is used, in general such a construction is intended in the sense one having ordinary skill in the art would understand the convention (e.g., "a system having at least one of A, B or C" would include but not be limited to systems that have a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B and C together, etc.). It will also be understood by those of ordinary skill in the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase "a or B" will be understood to encompass the possibility of "a" or "B" or "a and B".

From the foregoing, it will be appreciated that various embodiments of the invention have been described herein for purposes of illustration, and that various modifications may be made without deviating from the scope and spirit of the invention. Accordingly, the various embodiments disclosed herein are not meant to be limiting, with the true scope and spirit being determined by the following claims.

Claims

1. A method of sidelink resource allocation, comprising:

transmitting, to a peer user equipment, assistance information regarding a result of sensing one or more resources reserved for sidelink communication; and

receiving, at the peer user equipment, a transmission from the peer user equipment on a resource selected by the peer user equipment based on the assistance information.

2. The sidelink resource allocation method of claim 1, wherein the assistance information indicates a preference or non-preference of the peer ue to use the one or more reserved resources in performing the transmission.

3. The sidelink resource allocation method of claim 2, wherein the preference or non-preference is determined based on one or more of a measured reference signal received power on each of the one or more resources, a transmission priority of the peer user equipment, a priority of one or more other sensed user equipments, and one or more corresponding resources reserved by sidelink control information signaling from the peer user equipment.

4. The sidelink resource allocation method of claim 3, wherein the step of determining the preference or non-preference comprises comparing a measured reference signal received power of the one or more other sensed demodulation reference signal transmissions of the UE with a reference signal received power threshold.

5. The method of claim 1, wherein the step of sending the side link information comprises: the assistance information is sent a time period before the time when the peer user equipment performs the transmission.

6. The method of claim 5, wherein the period of time at least includes a processing time used by the UE of the peer for processing the assistance information.

7. The method of claim 1, wherein the step of sending the side link information comprises:

determining a feedback timing sequence for sending the auxiliary information based on the time when the opposite-end user equipment executes the transmission and the processing time used by the opposite-end user equipment when processing the auxiliary information; and

the side information is updated until the side information is transmitted at the feedback timing.

8. The sidelink resource allocation method of claim 1, further comprising:

receiving sidelink control information signaling from the peer user equipment; and

information regarding the one or more reserved resources is obtained from the sidelink control information signaling.

9. The sidelink resource allocation method of claim 1, further comprising:

determining one or more resource pools; and

sensing is performed on the one or more resource pools to measure a reference signal received power of each resource in the one or more resource pools to provide the sensing result.

10. The sidelink resource allocation method of claim 9, wherein the one or more resource pools comprise one or both of a receive resource pool for performing receive operations and a transmit resource pool for performing the transmission by the peer user equipment.

11. The sidelink resource allocation method of claim 9, wherein said step of determining said one or more resource pools comprises one of:

receiving signaling from the peer user equipment indicating the one or more resource pools; or

The one or more resource pools are determined based on configuration or pre-configuration information.

12. A method of sidelink resource allocation, comprising:

receiving, from a peer user equipment, assistance information regarding a result of sensing one or more resources reserved for sidelink communications; and

the transmission to the peer user equipment is performed on resources selected based on the assistance information.

13. The sidelink resource allocation method of claim 12, wherein the side information indicates a preference or non-preference of the peer ue for the one or more reserved resources used in performing the transmission.

14. The method of claim 12, wherein the step of performing the transmission comprises:

performing sensing on a transmission resource pool to provide a sensing result; and

the resource is selected from the pool of transmission resources based on the sensing result and the assistance information.

15. The method of claim 12, wherein the step of performing the transmission comprises one of:

selecting the resource from a pool of transmission resources based on the assistance information; or

The resource is reselected from a different pool of transmission resources based on the assistance information.

16. An apparatus for sidelink resource allocation, comprising:

a transceiver configured for wireless communication in a vehicle networking; and

a processor coupled to the transceiver and configured to perform the following operations with the transceiver:

transmitting, via the transceiver, assistance information regarding sensing results of one or more resources reserved for sidelink communications to a peer user equipment; and

receiving, via the transceiver, a transmission from the peer user equipment on a resource selected by the peer user equipment based on the assistance information.

17. The apparatus of claim 16, wherein the assistance information indicates a preference or non-preference of the peer user equipment for using the one or more reserved resources in performing the transmission, and wherein the processor determines the preference or non-preference based on one or more of a measured reference signal received power on each of the one or more resources, a transmission priority of the peer user equipment, one or more other sensed priorities of the user equipment, and one or more corresponding resources reserved by sidelink control information signaling from the peer user equipment.

18. The apparatus of claim 16, wherein in sending the assistance information, the processor sends the assistance information via the transceiver a period of time before a time at which the peer UE performs transmission, wherein the period of time includes at least a processing time used by the peer UE in processing the assistance information.

19. The apparatus of claim 16, wherein the processor performs the following operations in sending the side information:

20. The apparatus of claim 16, wherein the processor is further configured to:

determining one or more resource pools by:

Determining the one or more resource pools based on configuration or pre-configuration information; and

performing sensing on the one or more resource pools to measure a reference signal received power for each resource in the one or more resource pools, thereby providing the sensing result,

wherein the one or more resource pools include one or both of a receive resource pool for performing receive operations and a transmit resource pool for performing the transmission by the peer user equipment.