WO2023272743A1 - Procédé, appareil et programme informatique - Google Patents

Procédé, appareil et programme informatique Download PDF

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Publication number
WO2023272743A1
WO2023272743A1 PCT/CN2021/104386 CN2021104386W WO2023272743A1 WO 2023272743 A1 WO2023272743 A1 WO 2023272743A1 CN 2021104386 W CN2021104386 W CN 2021104386W WO 2023272743 A1 WO2023272743 A1 WO 2023272743A1
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WO
WIPO (PCT)
Prior art keywords
time
parameter
time sensitive
end station
transmission
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PCT/CN2021/104386
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English (en)
Inventor
Colin Kahn
Hua Chao
Original Assignee
Nokia Shanghai Bell Co., Ltd.
Nokia Solutions And Networks Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by Nokia Shanghai Bell Co., Ltd., Nokia Solutions And Networks Oy filed Critical Nokia Shanghai Bell Co., Ltd.
Priority to CN202180099979.0A priority Critical patent/CN117581586A/zh
Priority to PCT/CN2021/104386 priority patent/WO2023272743A1/fr
Publication of WO2023272743A1 publication Critical patent/WO2023272743A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/20—Services signaling; Auxiliary data signalling, i.e. transmitting data via a non-traffic channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
    • H04W72/512—Allocation or scheduling criteria for wireless resources based on terminal or device properties for low-latency requirements, e.g. URLLC

Definitions

  • the present application relates to a method, apparatus, and computer program for a wireless communication system.
  • a communication system may be a facility that enables communication sessions between two or more entities such as user terminals, base stations/access points and/or other nodes by providing carriers between the various entities involved in the communications path.
  • a communication system may be provided, for example, by means of a communication network and one or more compatible communication devices.
  • the communication sessions may comprise, for example, communication of data for carrying communications such as voice, electronic mail (email) , text message, multimedia and/or content data and so on.
  • Non-limiting examples of services provided comprise two-way or multi-way calls, data communication or multimedia services and access to a data network system, such as the Internet.
  • an apparatus in a cellular system comprising means configured to perform: receiving, from a first end station, a first message comprising at least one parameter, wherein the at least one parameter comprises information related to a time sensitive networking stream transmission from the first end station to at least one second end station; determining first time sensitive communications assistance information using the at least one parameter; determining a transmission time for the time sensitive networking stream transmission using at least one of: the determined first time sensitive communications assistance information, and the at least one parameter; and providing, to the first end station, information that comprises the determined transmission time for the time sensitive networking stream transmission.
  • the first end station is a talker.
  • the first end station is a traffic source device.
  • the data traffic to be transmitted originates at the talker/traffic source device.
  • the second end station is a listener.
  • the second end station is data stream destination device. The data traffic will be received by the listener/data stream destination device, that was transmitted by the talker.
  • the means are configured to perform: receiving, from the at least one second end station, a second message comprising an indication that the at least one second end station accepts the time sensitive networking stream transmission from the first end station.
  • the transmission time for the time sensitive networking stream transmission comprises a transmission time offset.
  • the first time sensitive communications assistance information comprises a burst arrival time.
  • the means configured to perform determining a burst arrival time are further configured to perform: determining a range of values for the burst arrival time using the at least one parameter received in the first message; and selecting a value from the determined range to be the burst arrival time.
  • the burst arrival time is selected randomly from the determined range.
  • the burst arrival time is selected from the determined range based on burst arrival times being used in other time sensitive networking stream transmissions.
  • the means are configured to perform: in response to receiving the indication that the at least one second end station accepts the time sensitive networking stream transmission, determining second time sensitive networking communications assistance information using the first time sensitive communications assistance information; and requesting network resources using the determined second time sensitive communications assistance information.
  • the first time sensitive communications assistance information is related to the ingress of the apparatus in the cellular system.
  • the second time sensitive communications assistance information is related to the air-interface.
  • the further time sensitive communications assistance information is determined by an SMF of the cellular system.
  • the network resources that are requested are 5GS resources.
  • the resources may include a radio access node.
  • the at least one parameter comprises at least one of: a TSpecTimeAware parameter; an AccumulatedLatency parameter; a TrafficSpecification parameter.
  • the TSpecTimeAware parameter comprises at least one of: an EarliestTransmitOffset value; a LatestTransmitOffset value; a jitter value.
  • At least one of the first message and the second message is one of: a multicast stream reservation protocol message; a resource allocation protocol message; a link-local registration protocol message.
  • the transmission time offset is a TimeAwareOffset parameter.
  • the apparatus comprises one or more of: core network functions; radio access network functions; user equipments.
  • the cellular system is a 5G system.
  • the apparatus is configured to communicate with time sensitive networking bridges using a credit-based shaper algorithm.
  • an apparatus comprising: one or more processors, and memory storing instructions that, when executed by the one or more processors, cause the apparatus to perform: receiving, from a first end station, a first message comprising at least one parameter, wherein the at least one parameter comprises information related to a time sensitive networking stream transmission from the first end station to at least one second end station; determining first time sensitive communications assistance information using the at least one parameter; determining a transmission time for the time sensitive networking stream transmission using at least one of: the determined first time sensitive communications assistance information, and the at least one parameter; and providing, to the first end station, information that comprises the determined transmission time for the time sensitive networking stream transmission.
  • the first end station is a talker.
  • the first end station is a traffic source device.
  • the Talker may be a data stream source end station.
  • the data traffic to be transmitted originates at the talker/traffic source device.
  • the second end station is a listener.
  • the second end station is data stream destination device or data stream destination end station. The data traffic will be received by the listener/data stream destination device, that was transmitted by the talker.
  • the apparatus is caused to perform: receiving, from the at least one second end station, a second message comprising an indication that the at least one second end station accepts the time sensitive networking stream transmission from the first end station.
  • the transmission time for the time sensitive networking stream transmission comprises a transmission time offset.
  • the first time sensitive communications assistance information comprises a burst arrival time.
  • the apparatus is caused to perform: determining a range of values for the burst arrival time using the at least one parameter received in the first message; and selecting a value from the determined range to be the burst arrival time.
  • the burst arrival time is selected randomly from the determined range.
  • the burst arrival time is selected from the determined range based on burst arrival times being used in other time sensitive networking stream transmissions.
  • the apparatus is caused to perform: in response to receiving the indication that the at least one second end station accepts the time sensitive networking stream transmission, determining second time sensitive networking communications assistance information using the first time sensitive communications assistance information; and requesting network resources using the determined second time sensitive communications assistance information.
  • the first time sensitive communications assistance information is related to the ingress of the apparatus in the cellular system.
  • the second time sensitive communications assistance information is related to the air-interface.
  • the further time sensitive communications assistance information is determined by an SMF of the cellular system.
  • the network resources that are requested are 5GS resources.
  • the resources may include a radio access node.
  • the at least one parameter comprises at least one of: a TSpecTimeAware parameter; an AccumulatedLatency parameter; a TrafficSpecification parameter.
  • the TSpecTimeAware parameter comprises at least one of: an EarliestTransmitOffset value; a LatestTransmitOffset value; a jitter value.
  • At least one of the first message and the second message is one of: a multicast stream reservation protocol message; a resource allocation protocol message; a link-local registration protocol message.
  • the transmission time offset is a TimeAwareOffset parameter.
  • the apparatus comprises one or more of: core network functions; radio access network functions; user equipments.
  • the cellular system is a 5G system.
  • the apparatus is configured to communicate with time sensitive networking bridges using a credit-based shaper algorithm.
  • a method comprising: receiving, from a first end station, a first message comprising at least one parameter, wherein the at least one parameter comprises information related to a time sensitive networking stream transmission from the first end station to at least one second end station; determining first time sensitive communications assistance information using the at least one parameter; determining a transmission time for the time sensitive networking stream transmission using at least one of: the determined first time sensitive communications assistance information, and the at least one parameter; and providing, to the first end station, information that comprises the determined transmission time for the time sensitive networking stream transmission.
  • the method comprises: receiving, from the at least one second end station, a second message comprising an indication that the at least one second end station accepts the time sensitive networking stream transmission from the first end station.
  • the transmission time for the time sensitive networking stream transmission comprises a transmission time offset.
  • the first time sensitive communications assistance information comprises a burst arrival time.
  • the determining a burst arrival time comprises: determining a range of values for the burst arrival time using the at least one parameter received in the first message; and selecting a value from the determined range to be the burst arrival time.
  • the burst arrival time is selected randomly from the determined range.
  • the burst arrival time is selected from the determined range based on burst arrival times being used in other time sensitive networking stream transmissions.
  • the method comprises in response to receiving the indication that the at least one second end station accepts the time sensitive networking stream transmission, determining second time sensitive networking communications assistance information using the first time sensitive communications assistance information; and requesting network resources using the determined second time sensitive communications assistance information.
  • the at least one parameter comprises at least one of: a TSpecTimeAware parameter; an AccumulatedLatency parameter; a TrafficSpecification parameter.
  • the TSpecTimeAware parameter comprises at least one of: an EarliestTransmitOffset value; a LatestTransmitOffset value; a jitter value.
  • At least one of the first message and the second message is one of: a multicast stream reservation protocol message; a resource allocation protocol message; a link-local registration protocol message.
  • the transmission time offset is a TimeAwareOffset parameter.
  • a computer program comprising computer executable instructions which when run on one or more processors perform: receiving, from a first end station, a first message comprising at least one parameter, wherein the at least one parameter comprises information related to a time sensitive networking stream transmission from the first end station to at least one second end station; determining first time sensitive communications assistance information using the at least one parameter; determining a transmission time for the time sensitive networking stream transmission using at least one of: the determined first time sensitive communications assistance information, and the at least one parameter; and providing, to the first end station, information that comprises the determined transmission time for the time sensitive networking stream transmission.
  • a computer product stored on a medium may cause an apparatus to perform the methods as described herein.
  • An electronic device may comprise apparatus as described herein.
  • AMF Access Management Function
  • eNB eNodeB
  • gNB gNodeB
  • MSRP Multicast Stream Reservation Protocol
  • NEF Network Exposure Function
  • NG-RAN Next Generation Radio Access Network
  • NRF Network Repository Function
  • PLMN Public Land Mobile Network
  • PSFP Per-Stream Filtering and Policing
  • SMF Session Management Function
  • TLV Type, Length, Value
  • TSCAI TSC Assistant Information
  • TSN Time Sensitive Networking
  • UE User Equipment
  • VIAPA Video, Imaging and Audio for Professional Applications
  • 5GC 5G Core network
  • 5G-AN 5G Radio Access Network
  • Figure 1 shows a schematic representation of a 5G system
  • Figure 2 shows a schematic representation of a control apparatus
  • Figure 3 shows a schematic representation of a terminal
  • Figure 4 shows a schematic representation of the fully centralised model principle for time sensitive communications
  • Figure 5 shows a schematic representation of a 5GS edge bridge for uplink
  • Figure 6 shows a schematic representation of a 5GS edge bridge for downlink
  • Figure 7 shows an example signalling diagram between a Talker and a Listener via a 5GS bridge
  • Figure 8 shows an example method flow diagram performed by an apparatus
  • Figure 9 shows a schematic representation of a non-volatile memory medium storing instructions which when executed by a processor allow a processor to perform one or more of the steps of the method of Figure 8.
  • mobile communication devices/terminals or user apparatuses, and/or user equipments (UE) , and/or machine-type communication devices 102 are provided wireless access via at least one base station (not shown) or similar wireless transmitting and/or receiving node or point.
  • a communication device is provided with an appropriate signal receiving and transmitting apparatus for enabling communications, for example enabling access to a communication network or communications directly with other devices.
  • the communication device may access a carrier provided by a station or access point, and transmit and/or receive communications on the carrier.
  • FIG. 1 shows a schematic representation of a 5G system (5GS) 100.
  • the 5GS may comprises a device 102 such as user equipment or terminal, a 5G access network (5G-AN) 106, a 5G core network (5GC) 104, one or more network functions (NF) , one or more application function (AF) 108 and one or more data networks (DN) 110.
  • a device 102 such as user equipment or terminal
  • 5G-AN 5G access network
  • 5GC 5G core network
  • NF network functions
  • AF application function
  • DN data networks
  • the 5G-AN 106 may comprise one or more gNodeB (gNB) distributed unit functions connected to one or more gNodeB (gNB) centralized unit functions.
  • gNB gNodeB
  • gNB gNodeB
  • the 5GC 104 may comprise an access management function (AMF) 112, a session management function (SMF) 114, an authentication server function (AUSF) 116, a user data management (UDM) 118, a user plane function (UPF) 120, a network exposure function (NEF) 122 and/or other NFs.
  • AMF access management function
  • SMF session management function
  • AUSF authentication server function
  • UDM user data management
  • UPF user plane function
  • NEF network exposure function
  • mobile communication devices/terminals or user apparatuses, and/or user equipments (UE) , and/or machine-type communication devices are provided with wireless access via at least one base station or similar wireless transmitting and/or receiving node or point.
  • the terminal is provided with an appropriate signal receiving and transmitting apparatus for enabling communications, for example enabling access to a communication network or communications directly with other devices.
  • the communication device may access a carrier provided by a station or access point, and transmit and/or receive communications on the carrier.
  • FIG. 2 illustrates an example of a control apparatus 200 for controlling a function of the 5G-AN or the 5GC as illustrated on Figure 1.
  • the control apparatus or in short apparatus may comprise at least one random access memory (RAM) 211a, at least on read only memory (ROM) 211b, at least one processor 212, 213 and an input/output interface 214.
  • the at least one processor 212, 213 may be coupled to the RAM 211a and the ROM 211b.
  • the at least one processor 212, 213 may be configured to execute an appropriate software code 215.
  • the software code 215 may for example allow to perform one or more steps to perform one or more of the present aspects.
  • the software code 215 may be stored in the ROM 211b.
  • the control apparatus 200 may be interconnected with another control apparatus 200 controlling another function of the 5G-AN or the 5GC.
  • each function of the 5G-AN or the 5GC comprises a control apparatus 200.
  • two or more functions of the 5G-AN or the 5GC may share a control apparatus.
  • FIG 3 illustrates an example of a terminal 300, such as the terminal illustrated on Figure 1.
  • the terminal 300 may be provided by any device capable of sending and receiving radio signals.
  • Non-limiting examples comprise a user equipment, a mobile station (MS) or mobile device such as a mobile phone or what is known as a ’smart phone’ , a computer provided with a wireless interface card or other wireless interface facility (e.g., USB dongle) , a personal data assistant (PDA) or a tablet provided with wireless communication capabilities, a machine-type communications (MTC) device, a Cellular Internet of things (CIoT) device or any combinations of these or the like.
  • the terminal 300 may provide, for example, communication of data for carrying communications.
  • the communications may be one or more of voice, electronic mail (email) , text message, multimedia, data, machine data and so on.
  • the terminal 300 may receive signals over an air or radio interface 307 via appropriate apparatus for receiving and may transmit signals via appropriate apparatus for transmitting radio signals.
  • transceiver apparatus is designated schematically by block 306.
  • the transceiver apparatus 306 may be provided for example by means of a radio part and associated antenna arrangement.
  • the antenna arrangement may be arranged internally or externally to the mobile device.
  • the terminal 300 may be provided with at least one processor 301, at least one memory ROM 302a, at least one RAM 302b and other possible components 303 for use in software and hardware aided execution of tasks it is designed to perform, including control of access to and communications with access systems and other communication devices.
  • the at least one processor 301 is coupled to the RAM 302a and the ROM 302a.
  • the at least one processor 301 may be configured to execute an appropriate software code 308.
  • the software code 308 may for example allow to perform one or more of the present aspects.
  • the software code 308 may be stored in the ROM 302a.
  • the processor, storage and other relevant control apparatus may be provided on an appropriate circuit board and/or in chipsets. This feature is denoted by reference 304.
  • the device may optionally have a user interface such as keypad 305, touch sensitive screen or pad, combinations thereof or the like.
  • a display, a speaker and a microphone may be provided depending on the type of the device.
  • TSN time sensitive communications
  • TSN refers to a set of IEEE 802 standards that make Ethernet deterministic.
  • TSN is a technology that is on Layer 2 of the ISO/OSI model.
  • TSN adds definitions to guarantee determinism and throughput in Ethernet networks. It should be understood that examples are also applicable to other standards other than TSN.
  • 3GPP Rel. 16 time sensitive communications only supports TSN in fully centralized model.
  • 5GS functional architecture can be integrated into an IEEE TSN network as a TSN bridge to support periodic deterministic time-sensitive traffic flows.
  • a centralized network controller (CNC) provides the 5GS TSN bridge with port gate timing information according to IEEE 802.1Qbv. Respective information received from the CNC may be used to derive TSCAI.
  • the TSCAI may comprise flow direction, periodicity and burst arrival time (BAT) .
  • BAT burst arrival time
  • the TSCAI may be used in the RAN to optimize 5G air-interface scheduling.
  • TSCAI describes TSC traffic characteristics for use in the 5G System.
  • TSCAI may be used by a 5G-AN if it is provided by an SMF.
  • the knowledge of TSC traffic pattern is useful for 5G-AN to allow it to schedule periodic, deterministic traffic flows more efficiently either via configured grants, semi-persistent scheduling or with dynamic grants.
  • TSCAI may comprise flow direction information, wherein the flow direction is the direction of the TSC flow (uplink or downlink) .
  • TSCAI may also comprise periodicity, wherein the periodicity is the time period between the start of two transmission bursts.
  • TSCAI may also comprise a burst arrival time, wherein the burst arrival time is the latest time when a first packet of a data burst arrives at either the ingress of the RAN (in the downlink) , or the egress interface of a UE (in the uplink) .
  • TSCAI may also comprise a survival time, wherein the survival time is a time period that an application can survive without any bursts.
  • FIG. 4 shows a schematic representation of the fully centralised model principle for time sensitive communications.
  • a Talker may be an end station or a like device that acts as a traffic source.
  • the Talker may be a data stream source end station.
  • a Listener may be an end station or a like device.
  • the Listener may be a data stream destination end station.
  • One or more of the Talkers 401 may provide a stream of data to one or more of the Listeners 403.
  • the streams of data will travel via the bridges 405.
  • the CNC 407 is in communication with a centralised user configuration (CUC) 409.
  • CUC centralised user configuration
  • user and/or network configuration information can be exchanged between the CNC 407 and the CUC 409.
  • a Talker transmission time may be controlled by the CNC 407 and the CUC 409.
  • ‘TSpecTimeAware’ TLV Type, Length, Value
  • the CNC 407 determines the stream scheduling and provides a ‘TimeAwareOffset’ TLV in the status group to the Talker 401.
  • the ‘TimeAwareOffset’ together with a Talker defined Interval determines when the Talker 401 will transmit periodic traffic flow bursts to the Listener 403.
  • CBS credit-based shaper
  • 802.1Qbv gated/scheduled configuration is not supported at bridge egress ports. Issues may also arise for the 5GS when per-stream filtering and policing (PSFP) is not available.
  • PSFP and 802.1Qbv gate schedules are used to derive and configure the BAT at the 5GS.
  • BAT is one component of TSCAI used by the 5GS NG-RAN to optimize air-interface scheduling by exploiting knowledge of the deterministic stream characteristics.
  • the lack of 802.1Qbv gate scheduling and PSFP information for the 5GS ports means that the TSCAI determination mechanism cannot be reused with CBS. Furthermore, periodic deterministic transmission optimization using TSCAI within 5GS is not possible.
  • the 5GS delay may be in the order of milliseconds. This may be a longer delay than that of a wired Ethernet Bridge or the Ethernet port interface on the 5GS bridge, which may be in the order of a few ⁇ s.
  • the absence of TSCAI within the 5GS may introduce unacceptable delay for TSN streams even when CBS is used on bridge egress ports. Therefore, new methods are proposed to limit unwanted delays within the 5GS when CBS is configured.
  • One or more of the following examples aims to address the problem of determining TSCAI when 802.1Qbv scheduling and/or PSFP information is not configured in the 5GS bridge.
  • the examples are applicable to many standards, but may be particularly applicable for the IEEE 802.1Qcc Fully Distributed Model and the Centralized Network/Distributed User TSN Model.
  • a 5GS that is configured with CBS transmission at egress ports of the 5GS.
  • the 5GS may be configured to determine 5GS BAT the for ingress port and provide a transmission time and/or transmission time offset parameters to the Talker.
  • the 5GS may be arranged as an TSN bridge/edge bridge to the Talker. This may reduce transmission delay in the 5GS RAN by further deriving TSCAI information and providing it to the RAN. This will be discussed in more detail below.
  • the 5GS has the ability to determine TSCAI parameters based on input information provided by the Talker (IPT1) and/or the Listener (IPT2) .
  • the 5GS may specify a transmission time and/or transmission time offset to the Talker after determining the 5GS BAT for the ingress port:
  • - IPT1 may include at least one of: a traffic specification, ‘TSpecTimeAware’ requirements, and accumulated latency to the 5GS bridge.
  • - IPT2 may indicate a Listener’s attribute type to determine whether the Listener is ready to accept the advertised stream from the Talker.
  • the transmission time offset may be referred to as ‘TimeAwareOffset’ .
  • the traffic specification may be provided per stream and each stream may be mapped to a different quality of service flow in the 5GS.
  • the TSCAI may be derived per stream/per quality of service flow.
  • FIG. 5 shows a schematic representation of a 5GS edge bridge for uplink.
  • a Talker 501 which is connected to a 5GS bridge 503.
  • the distance between the Talker 501 and the 5GS bridge 503 results in an accumulated latency delay, which is represented by the double headed arrow in Figure 5.
  • the 5GS bridge 503 comprises a user equipment/device side TSN translator (DS-TT) 505, an NG-RAN 507, an SMF 509, a PCF 511, a TSN-AF 513, and a UPF/network side TSN translator (NW-TT) 515.
  • the 5GS bridge 503 is connected to a first TSN bridge 515.
  • the first TSN bridge 515 is connected to a second TSN bridge 517.
  • the second TSN bridge 519 is connected to a Listener 521.
  • the 5GS bridge 503 is configured with CBS.
  • the first 517 and second TSN bridges 519 are configured with CBS. It should be understood that in other examples, more or less than two TSN bridges may be present in a system.
  • the Talker 501 is configured to support schedule traffic.
  • the Talker 501 can send data packets/frames to the 5GS bridge 503.
  • the data packets/frames may be multicast stream reservation protocol (MSRP) frames.
  • MSRP multicast stream reservation protocol
  • the data packets/frames may be sent using other suitable protocols.
  • the 5GS bridge 503 is configured to translate the request to transmission selection in bridges supporting CBS. Transmission selection refers to how packets are selected for transmission from a port, which typically supports a queue for each traffic class. In some examples, a talker will use ‘Scheduled Traffic’ , but bridges downstream from the 5GS bridge will use CBS.
  • a ‘Talker Advertise’ message containing information in the traffic specification that allows for ‘Scheduled Traffic’ (e.g. specifically ‘TSpecTimeAware’ )
  • the 5GS “translates” this to a “transmission selection” method (e.g.: CBS) which is understandable to downstream bridges, before a ‘Talker Advertise’ message is propagated to the downstream bridges.
  • a “transmission selection” method e.g.: CBS
  • the UPF/NW-TT 515 detects the MSRP packet from the Talker 501.
  • the UPF/NW-TT 515 provides the MSRP packet to the TSN-AF 513.
  • the TSN-AF 513 extracts input information (IPT1) from the MSRP packet.
  • the TSN-AF 513 determines 5GS BAT.
  • the 5GS BAT may be for the ingress port of the 5GS.
  • the TSN-AF may determine TSCAI (first TSCAI) using the determined 5GS BAT.
  • the TSN-AF 513 provides the first TSCAI information to the SMF 509.
  • the SMF 509 determines second TSCAI for the RAN and sends the determined second TSCAI to the NG-RAN 507.
  • the second TSCAI for the RAN may be different to the first TSCAI determined by the TSN-AF 513.
  • the TSN-AF 513 determines a Talker transmission time and/or transmission time offset.
  • the Talker transmission time offset may be ‘TimeAwareOffset’ .
  • the TSN-AF 513 may determine the transmission time and/or transmission time offset using the 5GS BAT and/or first TSCAI.
  • the Talker may use the ‘TimeAwareOffset’ to schedule its transmit.
  • the TSN-AF 513 provides the MSRP packet to the UPF/NW-TT 515.
  • ‘TimeAwareOffset’ specifies the offset that the Talker shall use for transmission.
  • the network may return a value between ‘EarliestTransmitOffset’ and ‘LatestTransmitOffset’ of the Talker’s ‘TrafficSpecification’ .
  • the value may be, for example, expressed as nanoseconds after the start of the Talker’s ‘Interval’ value.
  • the UPF/NW-TT 515 provides the MSRP packet to the Talker 501.
  • the Talker begins the scheduled transmission to the Listener 503.
  • NFs network functions
  • Figure 6 shows a schematic representation of a 5GS edge bridge for downlink.
  • the system of Figure 6 is identical to the system of Figure 5, but shows in the downlink flow rather that the uplink.
  • Figure 6 has an additional step of (1a) as discussed in more detail below.
  • the Listener 521 sends data packets/frames to the 5GS bridge 503.
  • the data packets/frames may be multicast stream reservation protocol (MSRP) frames.
  • MSRP multicast stream reservation protocol
  • the data packets/frames may be sent using other suitable protocols.
  • the UPF/NW-TT 515 detects a MAC address of the Listener 521.
  • the MAC address can be used to identify a protocol data unit (PDU) session.
  • PDU protocol data unit
  • the 5GS bridge will receive data packets/frames from both the Talker and the Listener.
  • the UPF/NW-TT 515 detects packets containing MSRP messages and sends them to the TSN-AF 513.
  • the TSN-AF 513 interprets the MSRP message and performs the processing as described above.
  • the TSN-AF may be an example of the apparatus in the cellular system or control apparatus 200.
  • the functions and features of the apparatus in the cellular system or control apparatus 200 may be distributed among one or more functions of the 5GS-Bridge, such as for instance the SMF, PCF, NEF and TSN-AF.
  • the TSCAI setting for the RAN may be performed at the SMF 509 based on the corresponding TSCAI parameters sent by the TSN-AF 513 to the SMF 509 via the PCF 511.
  • Figure 7 shows an example signalling diagram between a Talker and a Listener via a 5GS bridge.
  • the Talker may be a traffic source device.
  • the Listener may be a traffic destination device.
  • the Talker transmits a message to the 5GS.
  • the message may schedule a transmission from the Talker to the Listener.
  • the transmission may be a TSN data stream.
  • the 5GS may be configured as a bridge/edge bridge in a similar manner to the systems of Figures 5 and 6.
  • the message may comprise input information (IPT1) related to the Talker.
  • the message may be an MSRP message.
  • the message may be one of: link local registration protocol (LRP) , resource allocation protocol (RAP) , simple network management protocol (SNMP) , network configuration protocol (Netconf) , Restconf, OPC unified architecture (OPC UA) .
  • LRP link local registration protocol
  • RAP resource allocation protocol
  • SNMP simple network management protocol
  • Netconf network configuration protocol
  • Restconf Restconf
  • OPC unified architecture OPC unified architecture
  • IPT1 may comprise information related to a scheduled transmission from the Talker.
  • IPT1 may comprise a ‘TSpecTimeAware’ parameter.
  • the ‘TSpecTimeAware’ parameter may comprise at least one of: an ‘EarliestTransmitOffset’ parameter, a ‘LatestTransmitOffset’ parameter, and a jitter value.
  • IPT1 may also comprise an ‘AccumulatedLatency’ parameter.
  • IPT1 may also comprise a ‘TrafficSpecification’ parameter.
  • the ‘TrafficSpecification’ parameter may comprise at least one of: an ‘Interval’ value, a ‘MaxFramesPerInterval’ value, a ‘MaxFrameSize’ value, a transmission selection from the Talker.
  • the ‘Interval’ specifies a period of time in which the traffic specification cannot be exceeded.
  • the traffic specification is specified by ‘MaxFramesPerInterval’ and ‘MaxFrameSize’ .
  • ‘MaxFramesPerInterval’ specifies the maximum number of frames that the Talker can transmit in one Interval.
  • ‘MaxFrameSize’ specifies maximum frame size that the Talker will transmit, excluding any overhead for media-specific framing (e.g., preamble, IEEE 802.3 header, priority/VID tag, CRC, interframe gap, etc. ) .
  • ‘EarliestTransmitOffset’ is the earliest offset within the interval at which the Talker is capable of starting transmission of its frames.
  • ‘LatestTransmitOffset’ is the latest offset within the interval at which the Talker is capable of starting transmission of its frames. Jitter specifies the inaccuracy in the Talker’s transmit time.
  • the Listener may transmit a further message to the 5GS.
  • the message may comprise input information (IPT2) related to the Listener.
  • the further message may be an MSRP message.
  • the message may be one of: link local registration protocol (LRP) , resource allocation protocol (RAP) , simple network management protocol (SNMP) , network configuration protocol (Netconf) , Restconf, OPC unified architecture (OPC UA) .
  • the further message from the Listener may include a positive response to accept the scheduled transmission from the Talker.
  • the further message may provide a negative response with respect to the scheduled transmission.
  • a talker would not start a TSN stream transmission unless a listener has indicated to accept the TSN stream.
  • the 5GS determines first TSCAI for the scheduled transmission using IPT1.
  • determining the first TSCAI may comprise determining a 5GS burst arrival time (BAT) .
  • the first TSCAI may also comprise further information/parameters.
  • the determination of the 5GS BAT may comprise deriving a range for the BAT, and then selecting a value within the range to use as the BAT for the scheduled transmission. This will be described in more detail below. It should be understood that BAT and 5GS BAT can be used interchangeably.
  • the 5G core network control plane (5GC-CP) , UE/DS-TT or UPF/NW-TT is responsible for determining the 5GS BAT.
  • the TSN AF of the 5GS determines the 5GS BAT using IPT1.
  • the 5GS uses information from the Talker and Listener to determine the TSCAI, as opposed to determining TSCAI from 802.1Qbv gate schedules and PSFP as per legacy solutions in 3GPP Rel. 16.
  • a 5GS ingress port may receive the message from the Talker from which IPT1 is obtained, for resource reservation for a stream in traffic class N.
  • the TSN-AF obtains IPT1 from an MSRP packet sent by the Talker which has been detected by the UPF/NW-TT.
  • an MSRP packet sent by the Talker is detected by the UE/DS-TT. The UE/DS-TT then sends the detected MSRP packet to the TSN AF.
  • a TSCAI periodicity may be set by the TSN-AF according to the ‘TrafficSpecification’ parameter included in IPT1.
  • the TSCAI periodicity may equal the ‘Interval’ value.
  • the TSN-AF identifies that the TSN stream direction is uplink as the TSN-AF determines that a source MAC address comprised in the message from the Talker has been detected by the 5GS and is associated with a protocol data unit (PDU) session.
  • PDU protocol data unit
  • the TSN-AF identifies that the TSN stream direction is downlink as the TSN-AF determines that a source MAC address in the further message from the Listener has been detected by the 5GS and associated with a PDU session.
  • the 5GC may use the information in IPT1 to derive a range for 5GS BAT as:
  • 5GS BAT is between [TimeA (Ta) , TimeB (Tb) ] , wherein:
  • Ta StartOfNextInterval +EarliestTransOffset (from Talker) + AccumulatedLatency (from Talker) (equation 2)
  • Tb StartOfNextInterval +LatestTransOffset (from Talker) + AccumulatedLatency (from Talker) (equation 3)
  • N is the smallest integer for which the relation
  • the TSN-AF selects a value for 5GS BAT from the derived range between Ta and Tb.
  • the 5GS BAT between Ta and Tb may be selected randomly.
  • the BAT may be selected algorithmically to avoid previously selected 5GS BATs (for other streams) . When selecting the BAT algorithmically to avoid other streams, this may minimise the probability of bursts colliding in the 5GS and at egress ports.
  • the Talker can start the transmission one or more ‘Intervals’ later than the determined first 5GS BAT, which means that whenever the Talker starts transmitting, the resources in 5GS are ready.
  • the 5GS derives a transmission time and/or transmission time offset for the Talker using the 5GS BAT and/or the first TSCAI.
  • the transmission time offset may be referred to as ‘TimeAwareOffset’ .
  • the 5GS derives the transmission time offset using the following equation:
  • TimeAwareOffset StartOfNextInterval + 5GS BAT –AccumulatedLatency (from Talker) -jitter (from Talker) (equation 4)
  • the 5GS requests reservation of the required network resources for the scheduled TSN transmission.
  • the network resources may be 5GS resources.
  • the request for reservation of the network resources may comprise determining second TSCAI including a BAT, and reserving the network resources using mechanisms defined for 5G QoS.
  • the second TSCAI may be determined used the 5GS BAT determined in S703.
  • S705 may take place before S704.
  • the 5GS transmits the determined transmission time and/or transmission time offset to the Talker.
  • the 5GS may also transmit an indication that the network resources have been reserved.
  • the Talker proceeds with the scheduled transmission to the Listener.
  • the transmission may be based on the transmission time and/or transmission time offset.
  • the 5GS receives the IPT1 from the Talker and/or IPT2 from the Listener at S701/S702.
  • the 5GS uses the IPT1 to determine second TSCAI, which may comprise determining a BAT referenced at the RAN.
  • the 5GS uses the determined BAT of the second TSCAI to determine a transmission time and/or ‘TimeAwareOffset’ which the 5GS sends to the Talker.
  • the 5GS also uses the determined BAT at S703 to request network resources from the RAN.
  • the determined BAT is used to determine the transmission time, as well as to request network resources from the RAN.
  • One or more of the previously described examples allows the 5GS to provide the second TSCAI to the RAN for the Fully Distributed and Centralized network/distributed user TSN models, which allows the RAN to improve latency for TSN streams.
  • the resource reservation in the 5GS only happens when necessary.
  • the 5GS may reserve resources only after the 5GS receives positive feedback from the Listener, which could reduce waste of network resources.
  • One or more of the previously described examples minimises the impact to the standard (for example, 3GPP Rel. 16) since the same TSCAI BAT determination method depending on the 5GS BAT can be reused.
  • Figure 8 shows an example method flow performed by an apparatus.
  • the apparatus may of a cellular system.
  • the cellular system may be a 5G system.
  • the method comprises receiving, from a first end station, a first message comprising at least one parameter, wherein the at least one parameter comprises information related to a time sensitive networking stream transmission from the first end station to at least one second end station.
  • the method comprises determining first time sensitive communications assistance information using the at least one parameter.
  • the method comprises determining a transmission time for the time sensitive networking stream transmission using at least one of: the determined first time sensitive communications assistance information, and the at least one parameter.
  • the method comprises providing, to the first end station, information that comprises the determined transmission time for the time sensitive networking stream transmission.
  • Figure 9 shows a schematic representation of non-volatile memory media 900a (e.g. computer disc (CD) or digital versatile disc (DVD) ) and 900b (e.g. universal serial bus (USB) memory stick) storing instructions and/or parameters 902 which when executed by a processor allow the processor to perform one or more of the steps of the methods of Figure 8.
  • 900a e.g. computer disc (CD) or digital versatile disc (DVD)
  • 900b e.g. universal serial bus (USB) memory stick
  • instructions and/or parameters 902 which when executed by a processor allow the processor to perform one or more of the steps of the methods of Figure 8.
  • some embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof.
  • some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although embodiments are not limited thereto.
  • firmware or software which may be executed by a controller, microprocessor or other computing device, although embodiments are not limited thereto. While various embodiments may be illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that these blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
  • the examples may be implemented by computer software stored in a memory and executable by at least one data processor of the involved entities or by hardware, or by a combination of software and hardware. Further in this regard it should be noted that any procedures may represent program steps, or interconnected logic circuits, blocks and functions, or a combination of program steps and logic circuits, blocks and functions.
  • the software may be stored on such physical media as memory chips, or memory blocks implemented within the processor, magnetic media such as hard disk or floppy disks, and optical media such as for example DVD and the data variants thereof, CD.
  • the memory may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory.
  • the data processors may be of any type suitable to the local technical environment, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) , application specific integrated circuits (ASIC) , gate level circuits and processors based on multi core processor architecture, as non-limiting examples.
  • circuitry may be configured to perform one or more of the functions and/or method steps previously described. That circuitry may be provided in the base station and/or in the communications device.
  • circuitry may refer to one or more or all of the following:
  • circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and/or firmware.
  • circuitry also covers, for example integrated device.

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

Abstract

Appareil dans un système cellulaire, l'appareil comprenant des moyens configurés pour : recevoir, en provenance d'une première station d'extrémité, un premier message comprenant au moins un paramètre, ledit paramètre comprenant des informations relatives à une transmission de flux de mise en réseau sensible au temps de la première station d'extrémité à au moins une seconde station d'extrémité, et déterminer des premières informations d'assistance à la communication sensibles au temps à l'aide dudit paramètre. Les moyens sont en outre configurés pour : déterminer un temps de transmission pour la transmission de flux de mise en réseau sensible au temps à l'aide des premières informations d'assistance à la communication sensibles au temps déterminées et/ou dudit paramètre, et fournir, à la première station d'extrémité, des informations qui comprennent le temps de transmission déterminé pour la transmission de flux de mise en réseau sensible au temps.
PCT/CN2021/104386 2021-07-02 2021-07-02 Procédé, appareil et programme informatique WO2023272743A1 (fr)

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