WO2023133900A1 - Procédé de traitement de trafic à réalité étendue et dispositif émetteur - Google Patents

Procédé de traitement de trafic à réalité étendue et dispositif émetteur Download PDF

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Publication number
WO2023133900A1
WO2023133900A1 PCT/CN2022/072407 CN2022072407W WO2023133900A1 WO 2023133900 A1 WO2023133900 A1 WO 2023133900A1 CN 2022072407 W CN2022072407 W CN 2022072407W WO 2023133900 A1 WO2023133900 A1 WO 2023133900A1
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WIPO (PCT)
Prior art keywords
stream
periodicity
packets
timer
frame
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PCT/CN2022/072407
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English (en)
Inventor
Yincheng Zhang
Jia SHENG
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Shenzhen Tcl New Technology Co., Ltd.
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Priority to PCT/CN2022/072407 priority Critical patent/WO2023133900A1/fr
Publication of WO2023133900A1 publication Critical patent/WO2023133900A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/50—Queue scheduling
    • H04L47/56—Queue scheduling implementing delay-aware scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/22—Traffic shaping
    • H04L47/225—Determination of shaping rate, e.g. using a moving window
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/43—Assembling or disassembling of packets, e.g. segmentation and reassembly [SAR]

Definitions

  • the present disclosure relates to the field of communication systems, and more particularly, to extended reality (XR) traffic processing method and transmitter device.
  • XR extended reality
  • Wireless communication systems such as the third-generation (3G) of mobile telephone standards and technology are well known.
  • 3G standards and technology have been developed by the Third Generation Partnership Project (3GPP) .
  • the 3rd generation of wireless communications has generally been developed to support macro-cell mobile phone communications.
  • Communication systems and networks have developed towards being a broadband and mobile system.
  • UE user equipment
  • RAN radio access network
  • the RAN comprises a set of base stations (BSs) that provide wireless links to the UEs located in cells covered by the base station, and an interface to a core network (CN) which provides overall network control.
  • BSs base stations
  • CN core network
  • the RAN and CN each conduct respective functions in relation to the overall network.
  • LTE Long Term Evolution
  • E-UTRAN Evolved Universal Mobile Telecommunication System Territorial Radio Access Network
  • 5G or NR new radio
  • the 5G wireless communication system has been designed to deliver enhanced mobile broadband (eMBB) , ultra-reliable low-latency communication (URLLC) , and massive machine type communication (mMTC) services.
  • eMBB enhanced mobile broadband
  • URLLC ultra-reliable low-latency communication
  • mMTC massive machine type communication
  • Extended reality (XR) and cloud gaming service is an important media application enabled by 5G.
  • XR service has some unique characteristics in the traffic profile while the current 5G system may not support XR service every well.
  • Some characteristics of XR traffic are list in the following:
  • Non-integer periodicity according to the agreed traffic models for XR service in the release seventeen (Rel-17) XR study item (SI) in 3GPP RAN1, a video stream of XR service can be configured with 30, 60, 90, or 120 frames per second (FPS) . As a consequence, the XR frames will arrive at RAN quasi-periodically with respective periodicity of 1/60, 1/90, or 1/120 second, known as non-integer periodicity. SPS/CG used for periodic traffic, which reduces control signaling overhead can be a good option used to serve XR traffic. However, the current configurations for SPS/CG periodicities can not match the non-integer periodicities of the XR traffic.
  • C-DRX connected mode discontinuous reception
  • XR traffic has a jitter effect for the data packet arrival time due to the different delay caused by XR data encoding, rendering, and network delivery.
  • the jitter effect renders the arrival time for a particular packet unpredictable for an XR traffic receiver device, such as a gNB or a UE.
  • a truncated Gaussian distribution is used to model the jitter for XR traffic.
  • the range of jitter is agreed to be [-4, 4] ms (i.e., from -4 ms to 4 ms) as baseline and [-5, 5] ms (i.e., from -5 ms to 5 ms) as optional.
  • a jitter is agreed to be [-4, 4] ms (i.e., from -4 ms to 4 ms) as baseline and [-5, 5] ms (i.e., from -5 ms to 5 ms) as optional.
  • Multiple data streams according to the agreed traffic models for XR service in the Rel-17 XR SI in 3GPP RAN1, multiple stream models for downlink (DL) XR traffic have three options:
  • Option 3 FOV + omnidirectional stream.
  • the I-frame is known as an intra-coded frame or an independent frame
  • the P-frame is known as a predicted frame.
  • a XR traffic flow of the Option 1 comprises a stream of I-frame and a stream of P-frame.
  • the video, audio, and data respectively represent a video stream, an audio stream, and a data stream in an XR traffic flow.
  • a XR traffic flow of the Option 2 comprises a video stream and an audio/data stream.
  • FOV represents a stream of field of vision (FOV) in an XR traffic flow.
  • a XR traffic flow of the Option 3 comprises a stream of FOV and an omnidirectional stream.
  • ⁇ Option 2 pose/control + aggregating scene, video, data, and audio;
  • Option 3A pose/control + aggregating streams of scene and video + aggregating streams of audio and data
  • ⁇ Option 3B pose/control + I-stream for video + P-stream for video.
  • pose/control represents a stream of pose and control information of an XR traffic flow. Due to different delays caused by encoding/rendering and network delivery for different streams, different streams from the same XR service may have different data packet arrival times even if all streams have the same periodicities. Multiple SPS/CG and C-DRX configurations could be used for multiple stream XR services. However, the performance of SPS/CG and C-DRX would be degraded significantly.
  • An object of the present disclosure is to propose a user equipment (UE) , a base station, and an XR traffic processing method.
  • UE user equipment
  • an embodiment of the invention provides an XR traffic processing method executable in a transmitter device, comprising:
  • an embodiment of the invention provides a transmitter device comprising a processor configured to call and run a computer program stored in a memory, to cause a device in which the processor is installed to execute the disclosed method.
  • the disclosed method may be implemented in a chip.
  • the chip may include a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute the disclosed method.
  • the disclosed method may be programmed as computer executable instructions stored in non-transitory computer readable medium.
  • the non-transitory computer readable medium when loaded to a computer, directs a processor of the computer to execute the disclosed method.
  • the non-transitory computer readable medium may comprise at least one from a group consisting of: a hard disk, a CD-ROM, an optical storage device, a magnetic storage device, a Read Only Memory, a Programmable Read Only Memory, an Erasable Programmable Read Only Memory, EPROM, an Electrically Erasable Programmable Read Only Memory and a Flash memory.
  • the disclosed method may be programmed as a computer program product, that causes a computer to execute the disclosed method.
  • the disclosed method may be programmed as a computer program, that causes a computer to execute the disclosed method.
  • Embodiments of the invention provides the following useful effects:
  • SPS semi-persistent scheduling
  • CG configured grant
  • C-DRX connected mode discontinuous reception
  • FIG. 1 illustrates a schematic view showing an example of a telecommunication system.
  • FIG. 2 illustrates a schematic view showing an embodiment of a network for the disclosed XR traffic processing method.
  • FIG. 3 illustrates a schematic view showing an example of protocol stacks of entities involved in an XR traffic flow between a UE and an XR server.
  • FIG. 4 illustrates a schematic view showing an example of protocol stacks in a protocol data unit (PDU) for an XR traffic service with one single stream.
  • PDU protocol data unit
  • FIG. 5 illustrates a schematic view showing an example of disclosed XR traffic processing method.
  • FIG. 6 illustrates a schematic view showing an example of disclosed XR traffic processing method.
  • FIG. 7 illustrates a schematic view showing an example of an XR stream before and after shaping.
  • FIG. 8 illustrates a schematic view showing an example of an XR stream before and after shaping.
  • FIG. 9 illustrates a schematic view showing an example of protocol stacks in a protocol data unit (PDU) for an XR traffic service with two streams.
  • PDU protocol data unit
  • FIG. 10 illustrates a schematic view showing an example of two XR streams using two separated timers to time periodicity.
  • FIG. 11 illustrates a schematic view showing an example of two XR streams sharing one common timer to time periodicity.
  • FIG. 12 illustrates a schematic view showing an embodiment of a shaping unit realized in a layer for SDAP and QoS flow handling.
  • FIG. 13 illustrates a schematic view showing another embodiment of a shaping unit realized in a layer for SDAP and QoS flow handling.
  • FIG. 14 illustrates a schematic view showing an embodiment of a shaping unit realized in a layer for PDCP handling.
  • FIG. 15 illustrates a schematic view showing another embodiment of a shaping unit realized in a layer for PDCP handling.
  • FIG. 16 illustrates a schematic view showing an embodiment of a shaping unit realized in a layer for RLC and logical channel handling.
  • FIG. 17 illustrates a schematic view showing another embodiment of a shaping unit realized in a layer for RLC and logical channel handling.
  • FIG. 18 illustrates a schematic view showing a system for wireless communication according to an embodiment of the present disclosure.
  • each video frame may be segmented into one or multiple packets for network delivery.
  • a telecommunication system including a UE 10a, a UE 10b, a base station (BS) 20a, and a network entity device 30 executes the disclosed method according to an embodiment of the present disclosure.
  • FIG. 1 is shown for illustrative, not limiting, and the system may comprise more UEs, BSs, and CN entities. Connections between devices and device components are shown as lines and arrows in the FIGs.
  • 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 proposed functions, procedures and/or methods described in the description. Layers of radio interface protocol may be implemented in the processors 11a, 11b, 21a, and 31.
  • Each of the memory 12a, 12b, 22a, and 32 operatively stores a variety of programs and information to operate a connected processor.
  • Each of the transceivers 13a, 13b, 23a, and 33 is operatively coupled with a connected processor, transmits and/or receives radio signals or wireline signals.
  • the UE 10a may be in communication with the UE 10b through a sidelink.
  • the base station 20a may be an eNB, a gNB, or one of other types of radio nodes, and may configure radio resources for the UE 10a and UE 10b.
  • the network entity device 30 may be a node in a CN.
  • CN may include LTE CN or 5G core (5GC) which includes user plane function (UPF) , session management function (SMF) , mobility management function (AMF) , unified data management (UDM) , policy control function (PCF) , control plane (CP) /user plane (UP) separation (CUPS) , authentication server (AUSF) , network slice selection function (NSSF) , and the network exposure function (NEF) .
  • UPF user plane function
  • SMF session management function
  • AMF mobility management function
  • UDM unified data management
  • PCF policy control function
  • PCF control plane
  • CP control plane
  • UP user plane
  • CUPS authentication server
  • NSSF network slice selection function
  • NEF network exposure function
  • An example of the UE in the description may include one of the UE 10a or UE 10b.
  • An example of the base station in the description may include the base station 20a.
  • Uplink (UL) transmission of a control signal or data may be a transmission operation from a UE to a base station.
  • Downlink (DL) transmission of a control signal or data may be a transmission operation from a base station to a UE.
  • a DL control signal may comprise downlink control information (DCI) or a radio resource control (RRC) signal, from a base station to a UE.
  • DCI downlink control information
  • RRC radio resource control
  • FIG. 2 is a network model for XR service supported by 5G system.
  • a UE 10 is a 5G terminal which can support XR service and XR application.
  • a gNB 20 communicates with the UE 10 through NR Uu interface.
  • the gNB 20 is 5G radio node providing NR user plane and control plane protocol terminations towards the UE, and connected via the NG interface to a 5GC 300.
  • a UPF 30a is a User Plane Function (UPF) in the 5GC 300 which is a 5G Core Network.
  • DN 40 is a data network (DN) 40 where an XR server 41 providing XR service is located.
  • the DN 40 can provide network operator services, Internet access, or 3rd 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 proposed functions, procedures and/or methods described in the description. Layers of radio interface protocol may be implemented in the processor 411.
  • the memory 412 operatively stores a variety of programs and information to operate a connected processor.
  • the transceivers 413 is operatively coupled with a connected processor, transmits and/or receives radio signals or wireline signals.
  • Each of the processors 411, 11a, 11b, 21a, and 31 may include an application-specific integrated circuit (ASICs) , other chipsets, logic circuits and/or data processing devices.
  • ASICs application-specific integrated circuit
  • Each of the memory 412, 12a, 12b, 22a, and 32 may include read-only memory (ROM) , a random access memory (RAM) , a flash memory, a memory card, a storage medium 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.
  • RF radio frequency
  • a device executing the XR traffic processing method may be a transmitter device that transmits an XR traffic flow of an XR service to a receiver device.
  • the transmitter device may comprise an XR server 41 in data network 40 or a UE. That is, the XR server 41 in data network 40 may operates as a transmitter device that executes an XR traffic processing method in some XR traffic delivery occasions.
  • the UE 10 may operate as a transmitter device to execute an XR traffic processing method in some XR traffic delivery occasions.
  • the transmitter device may comprise an intermediate device between the UE 10 and the XR server 41.
  • the UE 10 may comprise an embodiment of the UE 10a or UE 10b.
  • the gNB 20 may comprise an embodiment of the base station 20a. Note that although the gNB 20 is described as an example in the description, the XR traffic processing method may be executed by a base station, such as another gNB, an eNB, a base station integrating an eNB and a gNB, or a base station for beyond 5G technologies.
  • One or more of embodiments of shaping units 100, 100a, 100b, 100c, 100d, 100e, 100f, 100g, 100h, 100i, and 100j in FIGs. 4, 9, 12-17 may be implemented as computer programs, instructions, software module (s) stored in a memory of the transmitter device, or circuits or hardware module (s) in a processor of the transmitter device, or IC chip (s) , circuits, or plug-in (s) of the transmitter device.
  • FIG. 3 show an example of overall protocol stacks between the UE 10 and the XR server 41 including intermediate entities (i.e., gNB 20 and UPF 30a) . Communications between any couple of entities in the same protocol layer is shown as arrows. Protocol layers in FIG. 3 have been standardized and are briefly explained in the following:
  • ⁇ L1 The physical layer of Internet which can be any suitable layer 1 technique, such as point-to-point or point-to-multipoint techniques;
  • ⁇ L2 The data link layer of Internet which can be any suitable Data Link Layer protocol, such as point-to-point protocol (PPP) , Ethernet, etc.;
  • PPP point-to-point protocol
  • Ethernet etc.
  • IP Internet Protocol
  • IPv6 Internet Protocol, Version 6 (IPv6) Specification
  • UDP "User Datagram Protocol” , which can be referred to in IETF RFC 768 (1980-08) ;
  • GTP-U "General Packet Radio System (GPRS) Tunnelling Protocol User Plane (GTPv1-U) " , which can be referred to in 3GPP TS 29.281;
  • GPRS General Packet Radio System
  • ⁇ PHY The physical layer of NR, which can be referred to in 3GPP TS 38.211 to 38.215;
  • ⁇ MAC NR Medium Access Control (MAC) protocol, which can be referred to in 3GPP TS 38.321;
  • RLC Radio Link Control
  • ⁇ PDCP NR; Packet Data Convergence Protocol (PDCP) , which can be referred to in 3GPP TS 38.323; and
  • PDCP Packet Data Convergence Protocol
  • SDAP Service Data Adaptation Protocol (SDAP) of Evolved Universal Terrestrial Radio Access (E-UTRA) and NR, which can be referred to in 3GPP TS 37.324.
  • SDAP Service Data Adaptation Protocol
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • NR NR
  • a video stream of an XR service will be encoded and compressed in form of frames quasi-periodically with the respective frame periodicity of 1/60, 1/90, or 1/120 second.
  • the periodicities are non-integer and mismatch with the configured periodicity of DRX cycle and SPS/CG, which can degrade the performance of the XR service significantly in 5G-RAN.
  • This disclosed method is to address this issue by means of shaping an XR traffic flow in a time domain so that the XR traffic flow is transformed into rearranged XR traffic flow with a periodicity that matches the periodicity of the DRX cycle and/or SPS/CG in NR.
  • a packet-based shaping function can be provided in one of the protocol layers in the transmitter device and the receiver device of the XR traffic flow.
  • the shaping function may comprise:
  • start time and periodicity are configurable based on one or more parameters of the 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, and/or data rate.
  • PDB packet delay budget
  • PER packet error rate
  • PLR packet loss rate
  • the size of each of the packets may be variable, the number of the packets may be variable and configurable based on one or more parameters of the QoS requirements and characteristics of the XR service, such as PDB, PER, PLR, frame error rate, frame delay budget, resolution, frame rate, and/or data rate.
  • the periodicity of the periodic timer matches the periodicity configured for discontinuous reception (DRX) cycle and semi-persistent scheduling (SPS) , and configured grant (CG) in NR, especially for the video stream with the frame rate of 30/60/90/120 frame per second, the corresponding frame periodicity of the video is 1000/30, 1000/60, 1000/90, 1000/120 millisecond which is non-integer, a method is provided to calculate and configure the periodicity as following:
  • K *frame periodicity (P1) is integer multiples (M) of (1/2) n (ms) which can be expressed as P2;
  • P2 is integer multiples of a slot of the corresponding NR radio frame
  • P2/X is integer multiples (N) of (1/2) n (ms) which can be expressed as P3;
  • P3 is integer multiples of a slot of the corresponding NR radio frame
  • ⁇ P3 is regarded as the periodicity of the periodic timer and can be configured with the parameter of K, n, X;
  • K, n, X is configurable, K , X is integer and bigger than 0, n is integer and equal or bigger than 0;
  • the value of K, n, and X is determined by one or more parameters of the QoS requirements and characteristics of the XR service, such as PDB (Packet Delay Budget) , PER (Packet Error Rate) , PLR (Packet Loss Rate) , frame error rate, frame delay budget, resolution, frame rate, data rate;
  • PDB Packet Delay Budget
  • PER Packet Error Rate
  • PLR Packet Loss Rate
  • frame error rate frame delay budget
  • resolution frame rate
  • n could be configured with an appropriate value so that (1/2) n is integer multiples of the length of slot in NR.
  • a shaping unit 100 implements the shaping functions.
  • An embodiment of the shaping unit 100 may comprise a buffering and grouping function 101, a timer 102, and a delivering function 103.
  • the buffering and grouping function 101 performs a function of buffering and grouping for packets of an XR service according to a periodicity of at least one or more periodicities P1, P2, and P3, the timer 102 keeps the periodicity of at least one or more periodicities P1, P2, and P3.
  • the delivering function 103 transmits the buffered and grouped packets according to periodicity P3.
  • the shaping unit in a protocol data unit (PDU) layer implements the shaping functions.
  • PDU protocol data unit
  • An XR server may be a source of an XR service.
  • the shaping unit 100 for executing the shaping function may operate in an XR server (e.g., the XR server 41) .
  • the shaping unit 100 for executing the shaping function may operate in a UE (e.g., UE 10) .
  • the shaping unit 100 may be implemented in any of the intermediate entities between the XR server 41 and the UE 10.
  • the shaping unit 100 is located at the “Payload formats” sub-layer.
  • FIG. 4 is one example of protocol stacks in a PDU layer for XR service with one single stream. Some abbreviations of the protocols are explained in the following:
  • RTP real time transport protocol
  • RTCP real time control protocol
  • SCTP stream control transmission protocol
  • DTLS Datagram Transport Layer Security
  • the transmitter device executes the shaping functions of shaping unit 100 includes buffering the packets of the XR stream and grouping the buffered packets into a number of subgroups of packets, using the periodic timer 102 to time a delivery period, and delivering the subgroups of packets periodically based on the periodicity of the periodic timer 102.
  • An embodiment of an extended reality (XR) traffic processing method is executable in the transmitter device. The XR traffic processing method comprises the following steps.
  • the shaping unit 100 receives and buffers packets for each of one or more XR streams in an XR traffic flow of an XR service (101) .
  • the shaping unit 100 may buffer data for each of one or more XR streams in the XR traffic flow of the XR service.
  • the shaping unit 100 may divide and encapsulate the buffered data into packets for each of one or more XR streams in the XR traffic flow.
  • the shaping unit 100 configures a periodic timer function for each of one or more XR streams in the XR traffic flow (103) .
  • the XR traffic flow may comprise one single XR stream or multiple XR streams.
  • the periodic timer function may comprise a timer that keeps a delivery period of the XR stream and provides an expiration event to trigger delivery of packets buffered for the XR stream.
  • the periodic timer function may comprise a common timer that keeps synchronized a delivery period shared by the multiple XR streams and provides an expiration event to trigger delivery of packets buffered for the XR streams.
  • the periodic timer function may comprise multiple timers that are synchronized by being set with the same start time and periodicity to keep synchronized a delivery period shared by the multiple XR streams and provide an expiration event to trigger delivery of packets buffered for the XR streams.
  • delivery of packets buffered for the XR streams is synchronized.
  • the shaping unit 100 delivers the packets for each of one or more XR streams in the XR traffic flow for transmission through a lower layer upon expiration event of the periodic timer function for each XR stream of the XR traffic flow (105) .
  • the expiration event may comprise a signal indicating expiration of one or more times in the periodic timer function.
  • the step 103 and step 105 further comprise the following steps.
  • the transmitter device determines a frame periodicity according to a frame rate of an XR stream of an XR traffic flow of an XR service for communication with a receiver device in the network (201) .
  • the transmitter device and the receiver device may negotiate the frame periodicity.
  • the frame periodicity may be determined in response to a user operation on the transmitter device.
  • an XR stream being a video stream of the XR traffic flow will be the main consideration for configuration of the shaping unit 100.
  • the transmitter device determines a frame periodicity being 1000/30 ms (i.e., 100/3 ms) according to the frame rate 30 fps.
  • the transmitter device determines a window size based on the frame periodicity, wherein the window size is limited by a value of the frame periodicity (203) .
  • the transmitter device determines a basic slot-based periodicity using the frame periodicity, wherein a timer in the periodic timer function is configured to time the basic slot-based periodicity (205) .
  • a timer in the periodic timer function is configured to time the basic slot-based periodicity (205) .
  • the transmitter device determines a basic time unit (1/2) n ms.
  • the basic time unit (1/2) n 0.5 ms.
  • the transmitter device configures an integer K and an integer M so that K *P1 is equal to an integer M multiple of the basic time unit (1/2) n ms.
  • the integer multiple M of the basic time unit is M* (1/2) n and can be expressed as a coarse slot-based periodicity P2.
  • the coarse slot-based periodicity P2 is integer multiples of a slot of a NR radio frame in a numerology configured for the transmitter device.
  • the following formula (1) shows a relationship between the P1 and the coarse slot-based periodicity P2.
  • the transmitter device configures an integer X and an integer N so that P2/X is integer N multiple of M* (1/2) n ms.
  • P2/X can be expressed as a basic slot-based periodicity P3.
  • P3 is integer multiples of a slot of a NR radio frame in a numerology configured for the transmitter device.
  • the following formula (2) shows a relationship between the basic time unit (1/2) n ms and the basic slot-based periodicity P2.
  • P3 is regarded as the periodicity of the periodic timer 102 and can be configured with the parameter of K, n, and X.
  • each of a window size P1 span 100 ms (denoted as the coarse slot-based period P2) .
  • the transmitter device groups packets of the XR stream into subgroups of packets, in which each subgroup of packets in a frame-period window having the window size comprises one or more packets of the XR stream grouped for rearrangement in the frame-period window (207) .
  • the transmitter device groups the group 601 of packets of the XR stream into a first subgroup of packets in a first frame period window (abbreviated as 1 st FP window in the FIGs) , a second subgroup of packets in a second frame period window (abbreviated as 2 nd FP window in the FIGs) , and a third subgroup of packets in a third frame period window (abbreviated as 3 rd FP window in the FIGs) .
  • the first subgroup of packets in the first frame-period window having the window size comprises five packets of the XR stream grouped for rearrangement in the first frame-period window.
  • the second subgroup of packets in the second frame-period window having the window size comprises two packets of the XR stream grouped for rearrangement in the second frame-period window.
  • the third subgroup of packets in the third frame-period window having the window size comprises two packets of the XR stream grouped for rearrangement in the third frame-period window.
  • the transmitter device rearranges locations of the one or more packets of the XR stream in each subgroup in an associated frame-period window according to the basic slot-based periodicity, wherein a length of the basic slot-based periodicity is less than the window size, and the window size is an integer multiple of the length of the basic slot-based periodicity (209) .
  • the sequencing of the packets in the group 601a is the same as the sequencing of the packets in the group 601 except that positions of the packets in the group 601a has been rearranged in time.
  • the transmitter device rearranges locations of the five packets in the first subgroup of group 601 within the first frame-period window to obtain five packets in the first subgroup of group 601a within the first frame-period window.
  • the transmitter device rearranges locations of the two packets in the second subgroup of group 601 within the second frame-period window to obtain two packets in the second subgroup of group 601a within the second frame-period window.
  • the transmitter device rearranges locations of the three packets in the third subgroup of group 601 within the third frame-period window to obtain two packets in the third subgroup of group 601a within the third frame-period window.
  • the transmitter device evenly allocates one or more packets of the XR stream in the first subgroup to delivery-period windows in the first frame-period window.
  • Each of the delivery-period windows in the first frame-period window contains exactly one packet of the first subgroup when a number of one or more packets of the XR stream in the first subgroup is equal to a number of delivery-period windows in the first frame-period window.
  • Each of the delivery-period windows in the first frame-period window contains one packet of the first subgroup or does not contain any packet of the first subgroup when the number of one or more packets of the XR stream in the first subgroup is less than the number of delivery-period windows in the first frame-period window. If the number of packets in a frame period is smaller than the number of delivery occasions in the corresponding frame period, the transmitter device can use some of the delivery occasions to transmit control packets for the XR stream. At least one of the delivery-period windows in the first frame-period window, which does not contain any packet of the first subgroup, provides capacity (i.e., a delivery occasion) to carry a control signal for the XR stream.
  • capacity i.e., a delivery occasion
  • Each of the delivery-period windows in the first frame-period window contains one or more packets of the first subgroup when the number of one or more packets of the XR stream in the first subgroup is more than the number of delivery-period windows in the first frame-period window.
  • the transmitter device transmits each packet of a subgroup in a delivery occasion.
  • all the packets received in a frame period are grouped into a number of subgroup and should be transmitted in a frame-period window.
  • Relocation (rearrangement) of the packets received in a frame-period window after the step 209 should not cross a border of the frame-period window.
  • Relocation (rearrangement) of the packets need not exceed a border of the frame-period window when the number of packets in each subgroup is equal or smaller than the number of delivery occasions in a frame-period window associated with the subgroup.
  • the shaping unit 100 prevents rearranged locations of the one or more packets of the XR stream in the first subgroup from exceeding the first frame-period window and prevents rearranged locations of the one or more packets of the XR stream in the second subgroup from exceeding the second frame-period window.
  • some delivery occasions in a frame period is greater than the number of packets in the frame period, some delivery occasions can include more than one packet.
  • the five packets in the first frame-period window, grouped as the first subgroup are relocated to delivery-period windows within the first frame-period window, where the second and third packets share the same delivery-period window
  • the shaping unit 100 is similar as the above with the exception that the all the packets for K frames are grouped as a whole into X subgroup of packets, and then the subgroups of packets will be delivered one by one every 10ms (i.e., every delivery occasion) .
  • the packets for frames are grouped averagely into X subgroups based on the number of delivery occasions and are delivered one by one at each delivery occasion, and some packets for one frame may be delivered in another frame period.
  • the transmitter device relocates a packet P1 of the group 601 in the first frame-period window to obtain the packet P1 of the group 601a in the second frame-period window.
  • the sequencing of the packets in the group 601a is the same as the sequencing of the packets in the group 601 except that positions of the packets in the group 601a has been rearranged in time.
  • the shaping unit 100 allocates to each of the delivery-period windows in the first frame-period window exactly one packet of the one or more packets of the XR stream in the first subgroup and allows rearranged locations of the one or more packets of the XR stream in the first subgroup to exceed the first frame-period window.
  • the XR traffic flow may comprise two streams.
  • the XR traffic flow may comprise a first XR stream and a second XR stream, where the XR stream in the aforementioned embodiment is the first XR stream.
  • the transmitter device uses a first timer to time the basic slot-based periodicity of the first XR stream, and a second timer to time a basic slot-based periodicity of the second XR stream.
  • the first timer and the second timer are synchronized by being set with the same start time and periodicity to keep synchronized a delivery period shared by the first XR stream and the second XR stream.
  • FIG. 9 is one example of protocol stacks in a PDU layer for XR service with multiple streams. In the example, one stream is for video content, and one stream is for audio and text content of the XR traffic flow.
  • Each of the shaping units 100 for the two streams operate similarly as detailed in the aforementioned embodiments and may separately have two independent timers 102.
  • the start time and periodicity for the two timers corresponding to the two streams are configured with the same value.
  • the packets delivery for the two streams in the same XR traffic flow always keep synchronized and aligned.
  • the sequencing of the packets in the group 601a is the same as the sequencing of the packets in the group 601, except that the positions of the packets in the group 601a have been rearranged in time.
  • the sequencing of the packets in the group 602a is the same as the sequencing of the packets in the group 602 except that positions of the packets in the group 602a has been rearranged in time.
  • the XR traffic flow comprises two XR streams sharing a common timer to time the basic slot-based periodicity shared by the two XR streams.
  • each of the shaping units 100 for the two streams operate similarly as detailed in the aforementioned embodiments and may share one common timer 102.
  • the packets delivery for two streams in the same XR traffic flow are triggered by the common timer periodically and always keep synchronized and aligned.
  • the sequencing of the packets in the group 601a is the same as the sequencing of the packets in the group 601 except that positions of the packets in the group 601a has been rearranged in time.
  • the sequencing of the packets in the group 602a is the same as the sequencing of the packets in the group 602 except that positions of the packets in the group 602a has been rearranged in time.
  • shaping unit 100 is located in SDAP layer in NR.
  • One embodiment is to shape the streams based on QoS flow as illustrated in FIG. 12.
  • the packets of the XR stream comprise protocol data units (PDUs) of a service data adaption protocol (SDAP) , one or more shaping units executing a function of the rearranging are located in an SDAP entity.
  • PDUs protocol data units
  • SDAP service data adaption protocol
  • the XR traffic flow comprises a first XR stream 51a having SDAP PDUs in the first XR stream 51a and a second XR stream 51b having SDAP PDUs in the second XR stream 51 b.
  • the shaping units 100a in the transmitter device uses a first timer to time the basic slot-based periodicity of the first XR stream
  • the shaping unit 100b uses a second timer to time a basic slot-based periodicity of the second XR stream.
  • the first timer and the second timer are synchronized by being set with the same start time and periodicity to keep synchronized a delivery period shared by the first XR stream and the second XR stream.
  • the XR traffic flow comprises two XR streams, including a first XR stream 51a having SDAP PDUs in first XR stream 51a and a second XR stream 51 b having SDAP PDUs in the second XR stream 51b.
  • the first XR stream and the second XR stream share a common timer to time the basic slot-based periodicity shared by the two XR streams.
  • Another embodiment is to shape the streams based on radio bearer (RB) as illustrated in FIG. 13.
  • the shaping units 100a and the shaping units 100b in the transmitter device use the common timer to time the basic slot-based periodicity shared by the two XR streams.
  • the packets of the XR stream comprise service data units (SDUs) of a service data adaption protocol (SDAP) in a quality of service (QoS) flow, one or more shaping units executing a function of the rearranging are located in an SDAP entity.
  • SDUs service data units
  • SDAP service data adaption protocol
  • QoS quality of service
  • the XR traffic flow comprises a first XR stream 51a having SDAP SDUs in a first QoS flow and a second XR stream 51 b having SDAP SDUs in a second QoS flow.
  • the shaping units 100c in the transmitter device uses a first timer to time the basic slot-based periodicity of the first XR stream, and the shaping units 100d uses a second timer to time a basic slot-based periodicity of the second XR stream.
  • the first timer and the second timer are synchronized by being set with the same start time and periodicity to keep synchronized a delivery period shared by the first XR stream and the second XR stream.
  • the XR traffic flow comprises two XR streams, including a first XR stream having SDAP SDUs in the first QoS flow and a second XR stream having SDAP SDUs in a second QoS flow.
  • the first XR stream and the second XR stream share a common timer to time the basic slot-based periodicity shared by the two XR streams.
  • the shaping units 100c and the shaping units 100d in the transmitter device use the common timer to time the basic slot-based periodicity shared by the two XR streams.
  • the shaping unit 100 for the stream or QoS flows or RBs may operate the shaping functions as aforementioned. If the XR traffic flow comprises more than one streams, the shaping units 100c and 100d for the streams or QoS flows or RBs may operate the shaping functions as aforementioned.
  • shaping unit 100 is located in PDCP layer in NR.
  • One embodiment is to shape the streams based on RB, as illustrated in FIG. 14.
  • the packets of the XR stream comprise protocol data units (PDUs) of a packet data convergence protocol (PDCP) in a radio bearer, one or more shaping units executing a function of the rearranging are located in a PDCP entity.
  • PDUs protocol data units
  • PDCP packet data convergence protocol
  • the XR traffic flow comprises a first XR stream 51a having PDCP PDUs in the first XR stream 51a and a second XR stream 51b having PDCP PDUs in the second XR stream 51b.
  • the shaping units 100e in the transmitter device uses a first timer to time the basic slot-based periodicity of the first XR stream
  • the shaping units 100f uses a second timer to time a basic slot-based periodicity of the second XR stream.
  • the first timer and the second timer are synchronized by being set with the same start time and periodicity to keep synchronized a delivery period shared by the first XR stream and the second XR stream.
  • the XR traffic flow comprises two XR streams, including a first XR stream 51a having PDCP PDUs in the first XR stream 51a and a second XR stream 51 b having PDCP PDUs in the second XR stream 51b.
  • the first XR stream and the second XR stream share a common timer to time the basic slot-based periodicity shared by the two XR streams.
  • the shaping units 100e and the shaping units 100f in the transmitter device use the common timer to time the basic slot-based periodicity shared by the two XR streams.
  • the packets of the XR stream comprise service data units (SDUs) of a packet data convergence protocol (PDCP) in a radio bearer, one or more shaping units executing a function of the rearranging are located in a PDCP entity.
  • SDUs service data units
  • PDCP packet data convergence protocol
  • the XR traffic flow comprises a first XR stream 51a having PDCP SDUs in the first radio bearer and a second XR stream 51b having PDCP SDUs in a second radio bearer.
  • the shaping units 100g in the transmitter device uses a first timer to time the basic slot-based periodicity of the first XR stream, and the shaping units 100h uses a second timer to time a basic slot-based periodicity of the second XR stream.
  • the first timer and the second timer are synchronized by being set with the same start time and periodicity to keep synchronized a delivery period shared by the first XR stream and the second XR stream.
  • the XR traffic flow comprises two XR streams, including a first XR stream 51a having PDCP SDUs in the first radio bearer and a second XR stream 51 b having PDCP SDUs in a second radio bearer.
  • the first XR stream and the second XR stream share a common timer to time the basic slot-based periodicity shared by the two XR streams.
  • the shaping units 100g and the shaping units 100h in the transmitter device use the common timer to time the basic slot-based periodicity shared by the two XR streams.
  • Another embodiment is to shape the streams based on RLC channel as illustrated in FIG. 15.
  • the shaping unit 100 for the stream or RB or RLC channel may operate the shaping functions as aforementioned. If the XR traffic flow comprises more than one streams, the shaping units 100g and 100h for the streams or RBs or RLC channels may operate the shaping functions as aforementioned.
  • the shaping unit 100 is located in RLC layer in NR to shape the streams based on RLC channel as illustrated in FIG. 16.
  • the shaping unit 100i for the stream or RLC channel may operate the shaping functions as aforementioned.
  • the shaping units 100i and 100j for the streams or RLC channels may operate the shaping functions as aforementioned.
  • the packets of the XR stream comprise protocol data units (PDUs) of a radio link control (RLC) layer in the XR stream, one or more shaping units executing a function of the rearranging are located in an RLC entity.
  • PDUs protocol data units
  • RLC radio link control
  • the XR traffic flow comprises a first XR stream 51a having RLC PDUs in the first XR stream 51a and a second XR stream 51 b having RLC PDUs in the second XR stream51b.
  • the shaping units 100i in the transmitter device uses a first timer to time the basic slot-based periodicity of the first XR stream, and the shaping units 100j in the transmitter device use a second timer to time a basic slot-based periodicity of the second XR stream.
  • the first timer and the second timer are synchronized by being set with same start time and periodicity to keep synchronized a delivery period shared by the first XR stream and the second XR stream.
  • the XR traffic flow comprises two XR streams, including a first XR stream 51a having RLC PDUs in the first XR stream 51a and a second XR stream 51b having RLC PDUs in the second XR stream 51b.
  • the first XR stream and the second XR stream share a common timer to time the basic slot-based periodicity shared by the two XR streams.
  • the shaping units 100i and the shaping units 100j in the transmitter device use the common timer to time the basic slot-based periodicity shared by the two XR streams.
  • FIG. 18 is a block diagram of an example system 700 for wireless communication according to an embodiment of the present disclosure. Embodiments described herein may be implemented into the system using any suitably configured hardware and/or software.
  • FIG. 18 illustrates the system 700 including a radio frequency (RF) circuitry 710, a baseband circuitry 720, a processing unit 730, a memory/storage 740, a display 750, a camera 760, a sensor 770, and an input/output (I/O) interface 780, coupled with each other as illustrated.
  • RF radio frequency
  • the processing unit 730 may include circuitry, such as, but not limited to, one or more single-core or multi-core processors.
  • the processors may include any combinations of general-purpose processors and dedicated processors, such as graphics processors and application processors.
  • the processors may be coupled with 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.
  • the radio control functions may include, but are not limited to, signal modulation, encoding, decoding, radio frequency shifting, etc.
  • the baseband circuitry may provide for communication compatible with one or more radio technologies.
  • the baseband circuitry may support communication with 5G NR, LTE, an evolved universal terrestrial radio access network (EUTRAN) and/or other wireless metropolitan area networks (WMAN) , a wireless local area network (WLAN) , a wireless personal area network (WPAN) .
  • EUTRAN evolved universal terrestrial radio access network
  • WMAN wireless metropolitan area networks
  • WLAN wireless local area network
  • WPAN wireless personal area network
  • Embodiments in which the baseband circuitry is configured to support radio communications of more than one wireless protocol may be referred to as multi-mode baseband circuitry.
  • the baseband circuitry 720 may include circuitry to operate with signals that are not strictly considered as being in a baseband frequency.
  • baseband circuitry may include circuitry to operate with signals having an intermediate frequency, which is between a baseband frequency and a radio frequency.
  • the system 700 may be a mobile computing device such as, but not limited to, a laptop computing device, a tablet computing device, a netbook, an ultrabook, a smartphone, etc.
  • the system may have more or less components, and/or different architectures.
  • the methods described herein may be implemented as a computer program.
  • the computer program may be stored on a storage medium, such as a non-transitory storage medium.
  • the embodiment of the present disclosure is a combination of techniques/processes that can be adopted in 3GPP specification to create an end product.
  • the software function unit is realized and used and sold as a product, it can be stored in a readable storage medium in a computer.
  • the technical plan proposed by the present disclosure can be essentially or partially realized as the form of a software product.
  • one part of the technical plan beneficial to the conventional technology can be realized as the form of a software product.
  • the software product in the computer is stored in a storage medium, including a plurality of commands for a computational device (such as a personal computer, a server, or a network device) to run all or some of the steps disclosed by the embodiments of the present disclosure.
  • the storage medium includes a USB disk, a mobile hard disk, a read-only memory (ROM) , a random access memory (RAM) , a floppy disk, or other kinds of media capable of storing program codes.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La divulgation concerne un dispositif émetteur et un procédé de traitement de trafic de réalité étendue (XR). Le dispositif reçoit et met en mémoire tampon des paquets pour chaque flux de XR parmi un ou plusieurs flux de XR dans un flux de trafic de XR d'un service de XR. Le dispositif configure une fonction de temporisateur périodique pour chaque flux de XR parmi un ou plusieurs flux de XR dans le flux de trafic de XR. Le dispositif délivre les paquets pour chaque flux de XR parmi un ou plusieurs flux de XR dans le flux de trafic XR pour une transmission à travers une couche inférieure lors d'un événement d'expiration de la fonction de temporisateur périodique pour chaque flux de XR du flux de trafic de XR.
PCT/CN2022/072407 2022-01-17 2022-01-17 Procédé de traitement de trafic à réalité étendue et dispositif émetteur WO2023133900A1 (fr)

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WO2020247744A1 (fr) * 2019-06-07 2020-12-10 Qualcomm Incorporated Techniques de réception discontinue à durées de cycle non uniformes
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