CN118679819A

CN118679819A - Base station, user equipment and wireless communication method for expanding reality traffic

Info

Publication number: CN118679819A
Application number: CN202280091255.6A
Authority: CN
Inventors: 张银成; 生嘉
Original assignee: Huizhou TCL Mobile Communication Co Ltd
Current assignee: Huizhou TCL Mobile Communication Co Ltd
Priority date: 2022-02-11
Filing date: 2022-02-11
Publication date: 2024-09-20
Also published as: WO2023151030A1

Abstract

The present disclosure provides a base station, a User Equipment (UE), and a wireless communication method. The base station determines a frame period of an Extended real (XR) stream of an XR service according to a frame rate of the XR stream, and determines a configuration of radio resources configured for the XR service based on the frame period. The configuration of the radio resources configured for the XR service comprises a basic slot cycle of a periodic transmission mode of the XR service and/or an interval of a plurality of radio resource groups of the XR service. The periodic transmission mode includes one or more radio resource groups. Each of the plurality of radio resource groups comprises a number of periodic blocks of radio resources configured for the XR service. The base station allocates radio resources configured for the XR service.

Description

Base station, user equipment and wireless communication method for expanding reality traffic

Technical Field

The present application relates to the field of communication systems, and in particular, to a base station, a user equipment and a wireless communication method for Extended real (XR) traffic.

Background

Wireless communication systems, such as third generation (3rd Generation,3G) mobile phone standards and technologies, are well known. These 3G standards and technologies have been developed by the third generation partnership project (Third Generation Partnership Project,3 GPP). Third generation wireless communications have generally been developed to support macrocell mobile telephone communications. Communication systems and networks have evolved towards broadband and mobile systems. In a cellular wireless communication system, a User Equipment (UE) is connected to a radio access network (Radio Access Network, RAN) through a radio link. The RAN includes a set of Base Stations (BSs) that provide radio links for UEs located within a cell covered by the Base stations, and an interface to a Core Network (CN) that provides overall Network control. As is well known, the RAN and CN each perform a respective function related to the overall network. The 3GPP has developed a so-called long term evolution (Long Term Evolution, LTE) system, i.e. an evolved universal mobile telecommunications system terrestrial radio access network (Evolved Universal Mobile Telecommunication System Territorial Radio Access Network, E-UTRAN), for mobile access networks, wherein one or more macro cells are supported by a base station, called eNodeB or eNB (evolved NodeB). Recently, LTE is evolving further towards so-called 5G or New Radio (NR) systems, where one or more cells are supported by a base station, called gNB.

Technical problem

The 5G wireless Communication system is intended to provide enhanced mobile broadband (enhanced Mobile Broadband, eMBB), ultra-Reliable Low-latency Communication (Latency Communication, URLLC), and large-scale machine type Communication (MASSIVE MACHINE TYPE Communication, mMTC) services. In 5G or new air (NR), the features supporting emmbc, URLLC, and mMTC were introduced in 15 th edition and enhanced in 16 th and 17 th edition.

Extended Reality (XR) and cloud gaming services are important media applications supported by 5G. In 3GPP, a series of research projects have been completed, and it has been found that XR services have some unique characteristics in terms of traffic characteristics, whereas current 5G systems may not support XR services well. Some characteristics of XR traffic are listed below:

Non-integer periodicity: the video stream of the XR service may be configured to be 30, 60, 90 or 120 frames per Second (FRAMES PER seconds, FPS) according to the XR service traffic model agreed in 3gpp RAN1 release 17 (Rel-17) XR Study Item (SI). Thus, the XR frames will arrive at the RAN in a quasi-periodic manner with a period of 1/60, 1/90 or 1/120 seconds, respectively, the so-called non-integer periodicity. Semi-persistent scheduling (Semi- -

PERSISTENT SCHEDULING SPS) or Configuration Grant (CG)

Control signaling overhead can be reduced, which is a good choice for serving XR traffic. However, the current SPS/CG periodicity configuration cannot match the non-integer periodicity of XR traffic.

Dithering: XR traffic has a jitter effect on packet arrival times due to the different delays caused by XR data encoding, rendering, and network transport. The jitter effect makes XR traffic receiving devices (e.g., gNB or UE) unable to predict the arrival time of a particular packet. From the results of the RAN1 xrsi study, a truncated gaussian distribution was used to simulate the jitter of XR traffic. The agreed reference jitter range is [ -4,4] milliseconds (i.e., from-4 to 4 milliseconds), and the optional range is [ -5,5] milliseconds (i.e., from-5 to 5 milliseconds). Due to this jitter, it is apparent that the performance of SPS/CG and discontinuous reception (Connected Discontinuous Reception, C-DRX) in the connected state may be significantly reduced.

Thus, a solution to the problem of non-integer periodicity is needed.

Technical proposal

An object of the present disclosure is to propose a User Equipment (UE), a base station and a wireless communication method.

In a first aspect, an embodiment of the present invention provides a wireless communication method executable in a base station, comprising:

Determining the frame periodicity of an XR stream of an XR service according to the frame rate of the XR stream of the XR service;

determining a configuration of radio resources configured for the XR service based on the frame periodicity, wherein the configuration of radio resources configured for the XR service comprises at least one of:

Basic slot base periodicity for periodic transmission mode of the XR service; or (b)

An interval of a plurality of radio resource groups for the XR service;

wherein the periodic transmission mode comprises one or more of the plurality of radio resource groups, each of the plurality of radio resource groups comprising a plurality of periodic blocks of radio resources configured for the XR service; and

And allocating the wireless resources configured for the XR service.

In a second aspect, one embodiment of the invention provides a base station comprising a processor configured to invoke and run a computer program stored in a memory to cause a device in which the processor is installed to perform the disclosed method.

In a third aspect, one embodiment of the present invention provides a wireless communication method executable in a User Equipment (UE), comprising:

Periodically receiving the configuration of wireless resources configured for XR service according to the frame of the XR flow of the XR service;

Wherein the configuration of the radio resources configured for the XR service comprises at least one of:

An interval of a plurality of radio resource groups for the XR service;

Transmitting or receiving data of an XR stream of the XR service on the radio resource configured for the XR service.

In a fourth aspect, one embodiment of the invention provides a User Equipment (UE) comprising a processor configured to invoke and run a computer program stored in a memory to cause the device in which the processor is installed to perform the disclosed method.

The disclosed methods may be implemented in a chip. The chip may include a processor configured to invoke and run a computer program stored in a memory to cause a device on which the chip is installed to perform the disclosed methods.

The disclosed methods may be programmed as computer-executable instructions stored in a non-transitory computer-readable medium. When the non-transitory computer readable medium is loaded into a computer, a processor of the computer is instructed to perform the disclosed methods.

The non-transitory computer readable medium may include at least one of the following group: hard disk, compact disk read-only memory (Compact disc read only memory, CD-ROM), optical storage, magnetic storage, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory (ELECTRICALLY ERASABLE PROGRAMMABLE READ ONLY MEMORY, EEPROM), electrically erasable programmable read-only memory, and flash memory.

The disclosed methods can be programmed as a computer program product to cause a computer to perform the disclosed methods.

The disclosed methods may be programmed as a computer program to cause a computer to perform the disclosed methods.

Advantageous effects

Embodiments of the present invention provide the following benefits:

video frames of XR services may be split into one or more data packets for periodic transmission over the network. In one embodiment of the disclosed method, the gNB configures and groups radio resources (e.g., SPS and CG) for the XR service in NR in the time domain to carry video frames of the XR service.

One embodiment of the disclosed method provides related signaling to support enhanced radio resource allocation for the XR service and to improve radio resource efficiency in the NR.

Drawings

In order to more clearly illustrate the embodiments of the present disclosure or related techniques, the following drawings, which will be described in the embodiments, will be briefly introduced. It is apparent that the drawings are only some of the embodiments of the present disclosure. Other figures can be obtained from these figures by those of ordinary skill in the art without the need for inventive effort.

Fig. 1 shows a schematic diagram of an example of a telecommunication system.

Fig. 2 shows a schematic diagram of a network embodiment for the disclosed wireless communication method.

Fig. 3 shows a schematic diagram of an example of the protocol stacks of the entities involved in the XR service between the UE, the gNB and the 5 GC.

Fig. 4 shows a schematic diagram of a wireless communication method according to one embodiment of the present disclosure.

Fig. 5 shows a schematic diagram of a wireless communication method according to one embodiment of the present disclosure.

Fig. 6 shows a schematic diagram of an example of the XR service radio resource configuration.

Fig. 7 shows a schematic diagram of an example of the XR service radio resource configuration with non-integer periodicity.

Fig. 8 shows a schematic diagram of an example of the XR service radio resource configuration with integer periodicity.

Fig. 9 shows a schematic diagram of an example of the XR serving radio resource configuration enhancement signaling.

Fig. 10 shows a schematic diagram of a wireless communication system according to one embodiment of the present disclosure.

Detailed Description

The embodiments of the present disclosure describe in detail technical matters, structural features, achieved objects and effects with reference to the accompanying drawings, in particular as follows. In particular, the terminology used in the embodiments of the disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure.

The invention discloses a wireless communication method for Extended real (XR) traffic to enhance radio resource allocation (such as Semi-PERSISTENT SCHEDULING (SPS) or Configured Grant (CG)) in a 5G wireless communication system (new air interface, NR) to support Extended real (XR) services. XR services may include augmented Reality (Augmented Reality, AR), virtual Reality (VR), or Mixed Reality (MR).

Referring to fig. 1, a telecommunications system including a UE 10a, a UE 10b, a Base Station (BS) 20a and a network entity apparatus 30 performs the disclosed method according to one embodiment of the present disclosure. Fig. 1 is for illustrative purposes only and is not limiting, and the system may include more UE, BS and CN entities. Connections between devices and device components are represented by lines and arrows in the figures. The UE 10a may include a processor 11a, a memory 12a, and a transceiver 13a. The UE 10b may include a processor 11b, a memory 12b, and a transceiver 13b. The base station 20a may include a processor 21a, a memory 22a, and a transceiver 23a. The network entity device 30 may include a processor 31, a memory 32, and a transceiver 33. Each of the processors 11a, 11b, 21a and 31 may be configured to implement the functions, procedures and/or methods set forth in the description. Layers of the radio interface protocol may be implemented in the processors 11a, 11b, 21a and 31. Each of the memories 12a, 12b, 22a and 32 operatively stores various programs and information to operate the connected processors. Each of the transceivers 13a, 13b, 23a and 33 is operatively coupled to a connected processor to transmit and/or receive radio signals or wired signals. The UE 10a may communicate with the UE 10b through a side chain. The base station 20a may be one of an eNB, a gNB or other type of wireless node and may configure radio resources for the UE 10a and the UE 10 b.

The network entity device 30 may be a node in the CN. The CN may include a long term evolution Core Network (LTE CN) or a 5G Core Network (5G Core,5 gc) including a User Plane function (User Plane Function, UPF), a session management function (Session Management Function, SMF), a 5G Core access and mobility management function (ACCESS AND Mobility Management Function, AMF), a Unified data management (Unified DATA MANAGEMENT, UDM), a policy Control function (Policy Control Function, PCF), a Control Plane (CP)/User Plane (UP) separation (Control and User Plane Separation, CUPS), an authentication server function (Authentication Server Function, AUSF), a Network slice selection function (Network Slice Selection Function, NSSF), and a Network exposure function (Network Exposure Function, NEF).

Examples of UEs in the description may include one of the UE 10a or the UE 10 b. Examples of BSs in the description may include BS20a. Uplink (UL) transmission of control signals or data may be a transmission operation from the UE to the BS. Downlink (DL) transmission of control signals or data may be a transmission operation from the BS to the UE. The DL control signal may include downlink control information (Downlink Control Information, DCI) or a radio resource control (Radio Resource Control, RRC) signal from the BS to the UE.

Fig. 2 is a network model of a 5G system supporting XR services. The UE 10 is a 5G terminal supporting XR services and XR applications. The gNB 20 is a 5G wireless node. The gNB 20 communicates with the UE 10 and provides NR user plane and control plane protocol termination to the UE over an NR Uu interface. The gNB 20 is connected to the 5GC 300 through a NG interface. AMF 30b is an AMF in 5gc 300, and 5gc 300 is a 5G core network. DN 40 is a Data Network (DN) where an XR server 41 providing an XR service is located. DN 40 can provide network operator services, internet access, or third party services. The XR server 41 may include a processor 411, a memory 412, and a transceiver 413. The processor 411 may be configured to implement XR service related functions, procedures and/or methods in the description. Layers of the radio interface protocol may be implemented in the processor 411. The memory 412 is operative to store various programs and information to operate the connected processors. The transceiver 413 is operatively coupled to the connected processor to transmit and/or receive radio signals or wired signals.

Each of the processors 411, 11a, 11b, 21a, and 31 may include Application-specific integrated circuits (ASICs), other chipsets, logic circuits, and/or data processing devices. Each of the memories 412, 12a, 12b, 22a, and 32 may include Read-Only Memory (ROM), random access Memory (Random Access Memory, RAM), flash Memory, memory cards, storage mediums, and/or other storage devices. Each of the transceivers 413, 13a, 13b, 23a, and 33 may include baseband circuitry and Radio Frequency (RF) circuitry to process Radio Frequency signals. When the embodiments are implemented in software, the techniques described herein may be implemented with modules, programs, functions, entities, etc. that perform the functions described herein. The modules may be stored in memory and executed by a processor. The memory may be implemented within the processor or external to the processor, in which case it can be communicatively coupled to the processor via various means as is known in the art. The device performing the wireless communication method may be a transmitting device transmitting XR traffic of the XR service to a receiving device or a receiving device receiving the XR traffic. For example, a device performing the wireless communication method may include the gNB 20, the XR server 41 in the data network 40, or a UE. That is, the XR server 41 in the data network 40 may operate as a transmitting device for performing wireless communication methods in some XR traffic delivery scenarios. Also, the UE 10 may operate as a transmitting device to perform wireless communication methods in some XR traffic delivery scenarios. Or the sending device may comprise an intermediary device between the UE 10 and the XR server 41. The UE 10 may include one embodiment of the UE 10a or the UE 10 b. The gNB 20 may include one embodiment of a base station 20 a. Note that although the descriptions take the gNB 20 and the AMF/5gc 30b as examples, the wireless communication method may be performed by a base station, such as another gNB, an eNB, a base station integrating the enbs and the gNB, or a base station for overriding the 5G technology. The AMF/5GC 30b may include another network entity of 5 GC.

One or more steps (or modules) in embodiments of the present disclosure may be implemented as a computer program, instructions, software module, stored in a memory of a transmitting device, or implemented as a circuit or hardware module in a processor of the transmitting device, or implemented as an IC chip, circuit, or plug-in of the transmitting device.

Fig. 3 shows an example of an overall protocol stack between the UE 10 and the AMF/5gc 30b, including an intermediate entity (i.e. the gNB 20). Communication between any two entities in the same protocol layer is indicated by arrows. The protocol layers in fig. 3 have been standardized and are briefly described as follows:

physical layer: the physical layer of the Internet may be any suitable layer 1 technology, such as point-to-point or

A point-to-multipoint technique;

Data link layer: the data link layer of the Internet may be any suitable data link layer protocol

Such as Point-to-Point Protocol (PPP), ethernet, etc.;

IP: internet protocol (Internet Protocol), reference may be made to IETF RFC 791, or IETF

"Internet protocol version 6 (IPv 6) specification" in RFC 8200;

PHY: the physical layer of NR can be referred to 3gpp TS 38.211 to 38.215;

MAC: NR media Access control (Medium Access Control, MAC) protocol, reference may be made to

3GPP TS 38.321；

● RLC: NR radio Link control (Radio Link Control, RLC) protocol, reference may be made to 3GPP

TS 38.322；

SCTP: the flow control transmission protocol (Stream Control Transmission Protocol,

SCTP)；

● PDCP: the NR packet data convergence protocol (PACKET DATA Convergence Protocol,

PDCP), can refer to 3gpp TS 38.323;

SDAP: service data Adaptation protocol (SERVICE DATA Adaptation) for evolved universal terrestrial radio access (Evolved Universal Terrestrial RadioAccess, E-UTRA) and NR

Protocol, SDAP), can refer to 3gpp TS 37.324;

RRC: radio resource control (Radio Resource Control, RRC); NG-AP: NG application protocol (NG Application Protocol, NG-AP).

The XR service video stream will be quasi-periodically encoded and compressed in frames with a frame period of 1/60, 1/90 or 1/120 seconds, respectively. These periodicity are non-integer, not matching the configured discontinuous reception (Discontinuous Reception, DRX) periodicity and periodicity of SPS/CG, which may significantly degrade the performance of XR services in the 5G-RAN. The disclosed method solves this problem by serving XR traffic in NR with packet radio resources (such as SPS and/or CG) in the time domain. In the description, the radio resource group of the XR service is simply referred to as a "group", and the periodic transmission mode of the XR service is simply referred to as a "mode". The radio Resource Block may include radio resources in Resource Elements (REs) or Resource Blocks (RBs). SPS may represent SPS allocation or SPS transmission.

Since the transmitting device may divide the video stream of the XR service into a plurality of transmission units, each transmission unit is encapsulated and transmitted into transmission data packets transmitted across the network, the transmission mechanism of the XR service is actually packet based rather than frame based. The size of each data Packet may be variable, the number of data packets may be variable, and may be configured according to one or more parameters of the quality of service (Quality of Service, qoS) requirements and characteristics of the XR service, such as Packet delay Budget (PACKET DELAY bridge, PDB), packet error Rate (Packet Error Rate, PER), packet Loss Rate (PLR), frame error Rate, frame delay Budget, resolution, frame Rate, frame size, and/or data Rate.

The transmission packets of the XR service video stream arrive independently at the gNB20 over a period of time. The transmission data packets may have a periodicity characteristic and the periodicity is dependent on the periodicity of the frame rate of the XR service video stream. In one embodiment of the present disclosure, a base station (e.g., gNB 20) configures radio resources (e.g., SPS and/or CG) for XR service in NR by configuring radio resource blocks (e.g., SPS and/or CG) packets in the time domain to carry the transport packets. Configuring the radio resources (such as SPS and/or CG) for the XR service may include:

Configuring a periodic transmission mode;

configuring a plurality (called M) of radio resource blocks (such as SPS and/or M) for the periodic transmission mode

CG) group, if a plurality of groups are arranged, an interval between two adjacent groups (referred to as

T1); and

Configuring a plurality of (called N) radio resource blocks (e.g., SPS) within each of one or more groups

And/or CG) and configuring the interval between two adjacent radio resource blocks (e.g., SPS and/or CG)

(Referred to as T2).

The periodicity (P2) of the periodic transmission pattern, the number of groups (M), the interval (T1) between two groups in the periodic transmission pattern, the number (N) of radio resource blocks (e.g. SPS and/or CG), and the interval (T2) between two adjacent radio resource blocks (e.g. SPS and/or CG) within a group are configurable and may be determined taking into account one or more parameters of the quality of service (Quality of Service, qoS) requirements and characteristics of the XR service. The one or more parameters of the QoS requirements of the XR service may include one or more of Packet delay Budget (PACKET DELAY bridge, PDB), packet error Rate (Packet Error Rate, PER), packet Loss Rate (PLR), frame error Rate, frame delay Budget, resolution, frame Rate, frame size, and data Rate.

Referring to fig. 4 and 5, the gNB 20 and the UE 10 perform one embodiment of the disclosed methods.

The UE 10 initiates XR service (block 201). The gNB 20 determines the frame periodicity of the XR stream of the XR service based on the frame rate of the XR stream of the XR service (block 101). For example, referring to FIG. 6, for video streams serviced by the XR with frame rates of 30, 60, 90, or 120 frames per Second (FRAMES PER seconds, FPS), the gNB 20 determines that the respective frame periodicity of the video stream is 1000/30, 1000/60, 1000/90, or 1000/120 milliseconds (ms).

The gNB 20 determines (block 103) a configuration of radio resources configured for the XR service based on the frame periodicity, wherein the configuration of radio resources configured for the XR service comprises at least one of:

Basic slot base periodicity of the periodic transmission mode for the XR service; or (b)

Intervals of a plurality of radio resource groups for the XR service;

The periodic transmission mode includes one or more of the plurality of radio resource groups. Each of the plurality of radio resource groups includes N periodic blocks of radio resources configured for the XR service. Each of the periodic blocks of radio resources configured for the XR service includes a semi-persistent scheduling (SPS) allocation or Configuration Grant (CG) configured for the XR service. The frame periodicity of the XR stream of the XR service is represented by the variable P1. The basic slot basis periodicity of the periodic transmission mode is represented by the variable P2. The interval of the plurality of radio resource groups for the XR service is denoted by the variable T1. The interval of the first pair of adjacent radio resource groups in the periodic transmission mode may be the same as or different from the interval of the second pair of adjacent radio resource groups in the periodic transmission mode.

The gNB 20 may determine one or more parameters of P1, P2, and T1 based on quality of service (QoS) requirements of the XR service. QoS requirements of the XR service include Packet Delay Budget (PDB), packet Error Rate (PER), packet Loss Rate (PLR), frame error rate, frame delay budget, resolution, frame rate, frame size, or data rate.

Referring to fig. 6, based on the frame periodicity (P1) of the XR-serviced video stream, the gNB 20 configures an integer K such that k×p1 is an integer multiple of (1/2) ⁿ (ms), and the periodicity (P2) of the periodic transmission mode is configured as k×p1, i.e

K * P1 ＝ m * (1/2)ⁿ (ms) (1)

P2 ＝ K * P1 (2)

Where m is a positive integer.

N is a positive integer.

● K is a positive integer.

(1/2) ⁿ Is the slot periodicity associated with n, and ms is determined by the length of the slot in the NR radio frame

And (5) setting. The variable n is determined by the subcarrier spacing configured for the UE 10, and n=μ, for configuring the subcarrier spacing Δf in NR to be Δf=2 ^μ ·15kHz. The variable μ is defined in the 3GPP NR standard.

● Typically, P2 is an integer multiple of the time slot of the corresponding NR radio frame.

The gNB 20 allocates configured radio resources for the XR service according to the configuration (block 105). The UE 10 periodically receives a configuration of radio resources configured for the XR service based on frames of an XR stream of the XR service (block 203). The UE 10 transmits or receives data of an XR stream of the XR service on radio resources configured for the XR service (block 205).

In one embodiment, the gNB 20 determines an additional configuration of radio resources configured for the XR service, wherein the additional configuration of radio resources configured for the XR service comprises one or more of:

the number M of radio resource groups in the periodic transmission mode;

The number N of periodic blocks of radio resources configured within each of the plurality of radio resource groups;

And

Associated with N periodic blocks of radio resources configured within each of the plurality of radio resource groups

Is set to be equal to the periodic block interval T2.

K. M, N, N, T1, T2, P1, and P2 are configurable, each of K, M and N is an integer greater than 0, and N is an integer greater than or equal to 0. The gNB 20 may use one or more timers in a periodic timer function to time each of T1, T2, P1, and P2. Also, the UE 10 may use one or more timers in a periodic timer function to time each of T1, T2, P1, and P2.

K. The values of n and X are determined by one or more parameters of QoS requirements and characteristics of the XR service, such as Packet Delay Budget (PDB), packet Error Rate (PER), packet Loss Rate (PLR), frame error rate, frame delay budget, resolution, frame rate, frame size, and data rate;

The digital coding of NR (numerology) may also be considered when determining n. In particular, n may be configured to a suitable value such that (1/2) ⁿ is an integer multiple of the slot length in NR.

The embodiments of the present invention are described in the following detailed description, which is not intended to be limiting.

Referring to fig. 6, the number of groups (M) in the periodic transmission mode is determined by K. In one embodiment, M is generally equal to K.

If the gNB 20 configures a plurality of groups in the periodic transmission mode, an interval (T1) between two adjacent groups in the periodic transmission mode is an integer multiple of (1/2) ⁿ (ms). If the periodic transmission pattern comprises groups of intervals, the lengths of these intervals may be the same or different, the sum of all interval lengths being equal to the periodicity of the periodic transmission pattern.

The number (N) of radio resource blocks (e.g., SPS and/or CG) for each group in the periodic transmission mode is an integer. The gNB 20 may determine N in consideration of one or more parameters of quality of service (QoS) requirements and characteristics of the XR service. The one or more parameters of the QoS requirements of the XR service may include one or more of a Packet Delay Budget (PDB), a Packet Error Rate (PER), a Packet Loss Rate (PLR), a frame error rate, a frame delay budget, a resolution, a frame rate, a frame size, and a data rate. However, N should be less than the number of available hybrid automatic repeat request (Hybrid Automatic Repeat Request, HARQ) process IDs.

The interval (T2) between two adjacent radio resource blocks (e.g., SPS and/or CG) within a group may also be configured as an integer multiple of the basic time unit (1/2) ⁿ (ms). Typically, (1/2) ⁿ ms is the length of one slot in the NR. The interval (T2) between two adjacent radio resource blocks (e.g., SPS and/or CG) within a group may be configured as an integer multiple of an orthogonal frequency division multiplexing (Orthogonal Frequency Division Multiplexing, OFDM) symbol, which is a smaller unit of time in NR, which may be one fourteenth or one twelfth of a slot. The gNB 20 may determine the interval T2 taking into account one or more parameters of quality of service (QoS) requirements and characteristics of the XR service. The one or more parameters of the QoS requirements of the XR service may include one or more of a Packet Delay Budget (PDB), a Packet Error Rate (PER), a Packet Loss Rate (PLR), a frame error rate, a frame delay budget, a resolution, a frame rate, a frame size, and a data rate. Configuration of non-integer video frame periodicity:

Examples of non-integer frame periodic configurations of the XR service video stream are provided below. Typical frame rates for the XR service video streams include 30, 60, 90 and 120FPS. The XR service video stream at a frame rate of 30, 60, 90 or 120FPS has a non-integer periodicity of 1000/30, 1000/60, 1000/90 or 1000/120 ms.

Referring to fig. 7, in an example of a frame rate of 30FPS, p1=1000/30=100/3 (ms). The interval between two adjacent radio resource groups may be a rounded value of 100/3.

First, the gNB 20 determines a basic time unit (1/2) ⁿ (ms), assuming n=1, and (1/2) ⁿ (ms) =0.5 (ms). Assuming that n=1 means that according to the digital coding of NR, the corresponding subcarrier spacing is 30kHz and the length of one slot is 0.5 (ms), so that the basic time unit (1/2) ⁿ (ms) is equal to the length of one slot. The variable n is defined in the 3GPP standard.

The gNB 20 configures k=3, and the periodicity p2=k×p1=3×1000/30=100 (ms) of the periodic transmission mode is 200 times that of 0.5 (ms);

The gNB 20 is configured with m=3, and there are 3 intervals in the periodic transmission mode. The interval of the first pair of adjacent radio resource groups in the periodic transmission mode may be the same as or different from the interval of the second pair of adjacent radio resource groups. As shown in fig. 7, each of the 3 intervals (T1) has a length of 34ms or 33ms, and the sum of the 3 intervals is equal to the periodic length of the periodic transmission mode. The interval between two adjacent radio resource groups may be 34ms or 33ms. In one example, the 3 intervals are different in length, the first being 34ms, the second and third being 33ms, the total length of the 3 intervals being 100 (ms), equal to the periodicity of the periodic transmission mode. The gNB 20 may get 34ms by rounding up 100/3 and 33ms by rounding down 100/3. The gNB 20 may first obtain the interval between two adjacent radio resource groups by rounding up or down the frame periodicity P1, and then obtain the periodicity of the periodic transmission mode from the accumulated length of the intervals in the periodic transmission mode. Or the gNB 20 may obtain the periodicity of the periodic transmission pattern from the frame periodicity P1 using equation (1) and equation (2), and then obtain the interval between two adjacent radio resource groups by dividing the periodicity of the periodic transmission pattern by the number of intervals in the periodic transmission pattern and rounding up or down the division result.

In one embodiment, where n=4. When n=4, each set of radio resources of the XR service includes four uplink/downlink radio resource blocks. For example, each set of radio resources for the XR service may include four SPS downlink allocations, a combination of one SPS downlink allocation and three uplink CGs, a combination of two SPS downlink allocations and one uplink CG, a combination of three SPS downlink allocations and one uplink CG, or four uplink CGs.

In one embodiment, where t2=2 (ms). When t=2, the interval between two adjacent radio resource blocks in each group is 2 milliseconds.

Configuration of integer video frame periodicity:

Examples of integer frame periodic configurations of the XR service video stream are provided below. In another embodiment, typical frame rates of the XR service video stream include 50 and 250FPS. The XR service video stream at a frame rate of 50 or 250FPS has a non-integer periodicity of 1000/50 milliseconds or 1000/250 milliseconds.

Referring to fig. 8, in an example of a frame rate of 50FPS, p1=1000/50=20 (ms).

The gNB 20 determines a basic time unit (1/2) ⁿ (ms), assuming n=1, and (1/2) ⁿ (ms) =0.5 (ms). Assuming that n=1 means that according to the digital coding of NR, the corresponding subcarrier spacing is 30kHz and the length of one slot is 0.5 (ms), so that the basic time unit (1/2) ⁿ (ms) is equal to the length of one slot.

The gNB 20 configures k=1, and the periodicity p2=k×p1=1×20=20 (ms) of the periodic transmission mode, which is 40 times of 0.5 (ms);

The gNB 20 is configured with m=1, and there are only 1 interval in the periodic transmission mode. As shown in fig. 8, the interval (T1) has a length of 20 ms, which is equal to the periodicity of the periodic transmission mode. The interval between two adjacent radio resource groups is 20 ms. The gNB 20 may first obtain the interval between two adjacent radio resource groups by rounding up or down the frame periodicity P1, and then obtain the periodicity of the periodic transmission mode from the accumulated length of the intervals in the periodic transmission mode. Or the gNB 20 may obtain the periodicity of the periodic transmission pattern from the frame periodicity P1 using equation (1) and equation (2), and then obtain the interval between two adjacent radio resource groups by dividing the periodicity of the periodic transmission pattern by the number of intervals in the periodic transmission pattern and rounding up or down the division result.

In one embodiment, where n=5. When n=5, each set of radio resources of the XR service includes five uplink/downlink radio resource blocks. For example, each set of radio resources for the XR service may include five SPS downlink allocations, a combination of one SPS downlink allocation and four uplink CGs, a combination of two SPS downlink allocations and three uplink CGs, a combination of three SPS downlink allocations and two uplink CGs, a combination of four SPS downlink allocations and one uplink CG, or five uplink CGs.

Related signaling enhancement:

In one embodiment, the XR service related signaling enhancements for SPS/CG enhancements include:

● Signaling of QoS requirements and features between UE 10, gNB 20 and AMF 30b with respect to the XR service

Signaling;

● The XR service between the UE 10 and gNB 20 based on QoS requirements and characteristics of the XR service

Wireless resource configuration signaling;

signaling between UE 10 and gNB 20 regarding the XR serving radio resource activation or deactivation;

Signaling between UE 10 and gNB 20 about the XR service SPS transmission cancellation; and/or signaling between UE 10 and gNB 20 regarding the XR service CG cancellation.

Referring to fig. 9, in one embodiment, the UE 10 sends the QoS requirements and characteristic information of the XR service to the gNB 20 in an uplink Radio Resource Control (RRC) message. The AMF/5gc 30b may send QoS requirements and feature information of the XR service to the gNB 20 in an NG-AP message. The gNB 20 obtains the QoS requirements and characteristic information of the XR service from a Radio Resource Control (RRC) message of the UE 10 over an NR Uu interface (208) or from an NG-AP message of the AMF 30b over an NG interface (210). That is, the gNB 20 acquires the QoS requirements and the characteristic information of the XR service from an uplink Radio Resource Control (RRC) message of the UE 10. In one embodiment, the QoS requirements and characteristic information of the XR service include one or more of the following parameters:

packet Delay Budget (PDB);

Packet Error Rate (PER);

packet Loss Rate (PLR);

Frame error rate;

frame delay budget;

Resolution;

Frame rate;

Frame size; and

Data rate.

The gNB 20 configures the XR service radio resources (e.g. SPS/CG) based on QoS requirements and characteristics of the XR service, and then sends the XR service radio resource (e.g. SPS/CG) configuration information (212) to the UE 10 in an RRC message over an NR Uu interface. The gNB 20 sends the configuration of the radio resources configured for the XR service to the UE 10 in a downlink RRC message. The UE receives the configuration of radio resources configured for the XR service in a downlink RRC message. The XR service radio resource (e.g., SPS/CG) configuration information may include one or more of P1, P2, T1, T2, M, N, and n parameters. The frame periodicity of the XR stream of the XR service is represented by the variable P1. The basic slot basis periodicity of the periodic transmission mode is represented by the variable P2. The interval of the plurality of radio resource groups for the XR service is denoted by the variable T1.

The gNB 20 may determine one or more of the P1, P2, and T1 parameters based on quality of service (QoS) requirements of the XR service. The gNB 20 may determine an additional configuration of radio resources configured for the XR service, wherein the additional configuration of radio resources configured for the XR service includes one or more of:

the number M of radio resource groups in the periodic transmission mode;

the number of periodic blocks of radio resources configured within each of the plurality of radio resource groups

N; and

The interval T2 of periodic blocks related to N periodic blocks of radio resources configured within each of the plurality of radio resource groups.

The determination of the additional configuration of radio resources configured for the XR service is based on quality of service (QoS) requirements of the XR service. QoS requirements of the XR service include Packet Delay Budget (PDB), packet Error Rate (PER), packet Loss Rate (PLR), frame error rate, frame delay budget, resolution, frame rate, frame size, or data rate.

The gNB 20 may activate or deactivate radio resources (e.g., SPS/CG) configured for the XR service by sending a downlink RRC message or a downlink Media Access Control (MAC) message to the UE 10 over the NR Uu interface (214). The UE 10 receives the downlink RRC message or the downlink MAC message and determines activation or deactivation of radio resources (e.g., SPS/CG) configured for the XR service by decoding the downlink RRC message or the downlink MAC message. The downstream MAC message may include a MAC control element (MAC CE).

For enhanced SPS, when one or more particular SPS allocations in a group have no data packets to transmit to the UE 10, the gNB 20 may send Downlink Control Information (DCI) to the UE 10 in a Physical Downlink Control Channel (PDCCH) to instruct the gNB 20 to cancel SPS transmissions on the one or more particular SPS allocations for the XR service to the UE 10 to improve radio resource efficiency (216). The UE 10 receives Downlink Control Information (DCI) indicating cancellation of SPS allocation of the XR service in a Physical Downlink Control Channel (PDCCH). The SPS transmissions are downlink transmissions on configured radio resource blocks associated with a particular SPS allocation. Cancellation of SPS transmissions for the XR service is limited to SPS transmissions only, and deactivation of radio resources (e.g., SPS/CG) configured for the XR service applies to all radio resources (e.g., SPS/CG) configured for the XR service, not just one particular SPS transmission.

For enhanced CG, when one or more specific CGs in a group have no data packets to transmit, the UE 10 may send Uplink control information (Uplink Control Information, UCI) in a Physical Uplink control channel (Physical Uplink Control Channel, PUCCH) or Physical Uplink shared channel (Physical Uplink SHARED CHANNEL, PUSCH) to instruct the gNB 20 to cancel CG transmissions on the one or more specific CGs of the XR service by the UE 10 to improve radio resource efficiency (218). The gNB 20 receives UCI in PUCCH or PUSCH from the UE 10, the UCI indicating CG cancellation of the XR service. CG transmissions are uplink transmissions on configured radio resource blocks associated with a particular CG. Cancellation of CG transmissions for the XR service is limited to CG transmissions only, whereas deactivation of radio resources (e.g., SPS/CG) configured for the XR service applies to all radio resources (e.g., SPS/CG) configured for the XR service, not just one specific CG transmission.

Fig. 10 is a block diagram of a wireless communication example system 700 according to one embodiment of the disclosure. The embodiments described herein may be implemented into a system using any suitable configuration of hardware and/or software. Fig. 10 illustrates a system 700 comprising Radio Frequency (RF) circuitry 710, baseband circuitry 720, processing unit 730, memory/storage 740, display 750, camera 760, sensor 770, and input/output (I/O) interface 780, coupled to one another as shown.

The processing unit 730 may include circuitry such as, but not limited to, one or more single-core or multi-core processors. These processors may include any combination of general purpose processors and special purpose processors, such as graphics processors and application processors. The processors may be coupled to the memory/storage and configured to execute instructions stored in the memory/storage to enable various applications and/or operating systems running on the system.

Radio control functions may include, but are not limited to, signal modulation, encoding, decoding, radio frequency shifting, and the like. In some embodiments, baseband circuitry may provide communications compatible with one or more radio technologies. For example, in some embodiments, the baseband circuitry may support communication with 5G NR, LTE, evolved Universal Terrestrial Radio Access Network (EUTRAN), and/or other Wireless Metropolitan Area Networks (WMANs), wireless Local Area Networks (WLANs), wireless Personal Area Networks (WPANs). An embodiment in which the baseband circuitry is configured to support radio communications of more than one wireless protocol may be referred to as a multi-mode baseband circuitry. In various embodiments, baseband circuitry 720 may include circuitry to operate signals that are not strictly considered baseband frequencies. For example, in some embodiments, the baseband circuitry may include circuitry to operate signals having an intermediate frequency that is between the baseband frequency and the radio frequency.

In various embodiments, system 700 may be a mobile computing device such as, but not limited to, a notebook, tablet, netbook, ultrabook, smartphone, or the like. In various embodiments, the system may have more or fewer components, and/or different architectures. The methods described herein may be implemented as computer programs, where appropriate. The computer program may be stored on a storage medium, such as a non-transitory storage medium.

Embodiments of the present disclosure are a combination of techniques/flows that may be employed in the 3GPP specifications to create a final product.

If the software functional unit is implemented, used and sold as a product, it may be stored in a readable storage medium of a computer. Based on this understanding, the technical solutions proposed by the present disclosure may be implemented substantially or partly in the form of a software product. Or a part of the technical solution beneficial to the conventional technology may be implemented in the form of a software product. The software product in the computer is stored in a storage medium and includes a plurality of commands for a computing device (e.g., a personal computer, a server, or a network device) to execute all or part of the steps disclosed in the embodiments of the present disclosure. The storage medium includes a USB disk, a removable hard disk, a read-only memory (ROM), a random-access memory (RAM), a floppy disk, or other medium capable of storing program code.

In embodiments of the present disclosure, the XR service video frames may be partitioned into one or more data packets for periodic transmission over a network. In one embodiment of the disclosed method, the gNB configures and groups radio resources (e.g., SPS and CG) for the XR service in NR in the time domain to carry video frames of the XR service. The UE transmits and receives data packets for the XR service using configured and packetized radio resources (e.g., SPS and CG).

While the present disclosure has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the present disclosure is not to be limited to the disclosed embodiment, but is intended to cover various arrangements without departing from the scope of the appended claims in its broadest interpretation.

Claims

1. A wireless communication method executable in a base station, comprising:

Determining the frame period of an XR stream of an XR service according to the frame rate of the XR stream of the extended reality XR service; determining a configuration of radio resources configured for the XR service based on the frame period, wherein the configuration of radio resources configured for the XR service comprises at least one of:

A basic time slot period of the periodic transmission mode of the XR service; or (b)

Intervals of a plurality of radio resource groups of the XR service;

Wherein the periodic transmission mode comprises one or more of the plurality of radio resource groups, each of the plurality of radio resource groups comprising a number of periodic blocks of radio resources configured for the XR service; and

And allocating the wireless resources configured for the XR service.

2. The method of claim 1, wherein each of the periodic blocks of radio resources Configured for the XR service comprises a Semi-persistent scheduling (SPS) allocation or Configuration Grant (CG) Configured for the XR service.

3. The method of claim 1, wherein the interval between a first pair of adjacent radio resource groups in the periodic transmission mode is the same as or different from the interval between a second pair of adjacent radio resource groups in the periodic transmission mode.

4. The method of claim 1, wherein a frame period of an XR stream of the XR service is represented by a variable P1, a basic slot period of the periodic transmission mode is represented by a variable P2, wherein

K*P1＝m*(1/2)ⁿ

P2＝K*P1

Wherein m is a positive integer;

n is a positive integer and n=μ, for configuring the subcarrier spacing Δf to Δf= ^μ ·15kHz; k is a positive integer; and is also provided with

(1/2) ⁿ Is the slot period associated with n.

5. The method of claim 1, further comprising:

Determining an additional configuration of radio resources configured for the XR service, wherein the additional configuration of radio resources configured for the XR service comprises one or more of:

the number M of radio resource groups in the periodic transmission mode;

The number N of periodic blocks of radio resources configured in each of the plurality of radio resource groups; and

An interval T2 of periodic blocks related to N periodic blocks of radio resources configured in each of the plurality of radio resource groups.

6. The method of claim 5, wherein determining additional configuration of radio resources configured for the XR service is based on quality of service (Quality of Service, qoS) requirements of the XR service.

7. The method of claim 6, wherein the QoS requirements of the XR service comprise a Packet delay Budget (PACKET DELAY bridge, PDB), a Packet error Rate (Packet Error Rate, PER), a Packet Loss Rate (PLR), a frame error Rate, a frame delay Budget, a resolution, a frame Rate, a frame size, or a data Rate.

8. The method according to claim 1, characterized in that the base station obtains information about QoS requirements and characteristics of the XR service by means of an uplink radio resource control (Radio Resource Control, RRC) message or an NG-AP message from an access and mobility management function (ACCESS AND Mobility Management Function, AMF) in the 5G core network (5 GC).

9. The method of claim 1, wherein the base station transmits the configuration of radio resources configured for the XR service in a downlink RRC message.

10. The method of claim 1, wherein the base station activates or deactivates radio resources configured for the XR service by sending a downlink radio resource control (Radio Resource Control, RRC) message or a downlink medium access control (Medium Access Control, MAC) message.

11. The method of claim 1, wherein when there are no data packets to transmit in one or more specific Semi-persistent scheduling (Semi-PERSISTENT SCHEDULING, SPS) allocations in a radio resource group, the base station sends downlink control information (Downlink Control Information, DCI) in a physical downlink control channel (Physical Downlink Control Channel, PDCCH) to instruct the base station to cancel SPS allocations serving the XR.

12. The method of claim 1, wherein the base station receives Uplink control information (Uplink Control Information, UCI) in a Physical Uplink control channel (Physical Uplink Control Channel, PUCCH) or a Physical Uplink shared channel (Physical Uplink SHARED CHANNEL, PUSCH), the information indicating cancellation of one or more specific configuration grants (Configured Grants, CGs) for the XR service.

13. A base station, comprising:

A processor configured to invoke and run a computer program stored in a memory to cause a device in which the processor is installed to perform the method of any of claims 1 to 12.

14. A chip, comprising:

A processor configured to invoke and run a computer program stored in a memory to cause a device on which the chip is mounted to perform the method of any of claims 1 to 12.

15. A computer readable storage medium having stored therein a computer program for causing a computer to perform the method of any one of claims 1 to 12.

16. A computer program product comprising a computer program, wherein the computer program causes a computer to perform the method of any one of claims 1 to 12.

17. A computer program, wherein the computer program causes a computer to perform the method of any one of claims 1 to 12.

18. A wireless communication method executable in a User Equipment (UE), comprising:

Receiving a configuration of radio resources configured for an XR service based on a frame period of the XR stream of the XR service;

wherein the configuration of radio resources configured for the XR service comprises at least one of:

Intervals of a plurality of radio resource groups of the XR service;

Transmitting or receiving data of an XR stream of the XR service on a radio resource configured for the XR service.

19. The method of claim 18, wherein each of the periodic blocks of radio resources Configured for the XR service comprises a Semi-persistent scheduling (SPS) allocation or Configuration Grant (CG) Configured for the XR service.

20. The method of claim 18, wherein the interval between a first pair of adjacent radio resource groups in the periodic transmission mode is the same as or different from the interval between a second pair of adjacent radio resource groups in the periodic transmission mode.

21. The method of claim 18, wherein a frame period of an XR stream of the XR service is represented by a variable P1, a basic slot period of the periodic transmission mode is represented by a variable P2, wherein

K*P1＝m*(1/2)ⁿ

P2＝K*P1

Wherein m is a positive integer;

(1/2) ⁿ Is the slot period associated with n.

22. The method of claim 18, wherein each of the periodic blocks of radio resources Configured for the XR service comprises a Semi-persistent scheduling (SPS) allocation or Configuration Grant (CG) Configured for the XR service.

23. The method of claim 18, wherein the configuration of radio resources configured for the XR service comprises an additional configuration of radio resources configured for the XR service, wherein the additional configuration of radio resources configured for the XR service comprises one or more of:

the number M of radio resource groups in the periodic transmission mode;

24. The method of claim 23, wherein determining additional configuration of radio resources configured for the XR service is based on quality of service (Quality of Service, qoS) requirements of the XR service.

25. The method of claim 24, wherein the QoS requirements of the XR service comprise a Packet delay Budget (PACKET DELAY bridge, PDB), a Packet error Rate (Packet Error Rate, PER), a Packet Loss Rate (PLR), a frame error Rate, a frame delay Budget, a resolution, a frame Rate, a frame size, or a data Rate.

26. The method of claim 18, wherein the UE sends information about quality of service (Quality of Service, qoS) requirements and characteristics of the XR service in an uplink radio resource control (Radio Resource Control, RRC) message.

27. The method of claim 18, wherein the UE receives a configuration of radio resources configured for the XR service in a downlink RRC message.

28. The method of claim 18, wherein the UE receives a downlink RRC message or a downlink medium access control (Medium Access Control, MAC) message and determines activation or deactivation of radio resources configured for the XR service by decoding the downlink RRC message or the downlink MAC message.

29. The method of claim 18, wherein the UE receives downlink control information (Downlink Control Information, DCI) in a physical downlink control channel (Physical Downlink Control Channel, PDCCH) indicating cancellation of Semi-persistent scheduling (Semi-PERSISTENT SCHEDULING, SPS) allocation serving the XR.

30. The method of claim 18, wherein when one or more specific configuration grants (Configured Grants, CGs) in a group have no data packets to transmit, the UE sends Uplink control information (Uplink Control Information, UCI) in a Physical Uplink control channel (Physical Uplink Control Channel, PUCCH) or Physical Uplink shared channel (Physical Uplink SHARED CHANNEL, PUSCH) to indicate that the CG of the XR service is cancelled.

31. A base station, comprising:

a processor configured to invoke and run a computer program stored in a memory to cause a device in which the processor is installed to perform the method of any of claims 18 to 30.

32. A chip, comprising:

A processor configured to invoke and run a computer program stored in a memory to cause a device on which the chip is mounted to perform the method of any of claims 18 to 30.

33. A computer readable storage medium having stored therein a computer program for causing a computer to perform the method of any one of claims 18 to 30.

34. A computer program product comprising a computer program, wherein the computer program causes a computer to perform the method of any one of claims 18 to 30.

35. A computer program, wherein the computer program causes a computer to perform the method of any one of claims 18 to 30.