WO2022077468A1 - Procédé, appareil et programme informatique - Google Patents

Procédé, appareil et programme informatique Download PDF

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Publication number
WO2022077468A1
WO2022077468A1 PCT/CN2020/121595 CN2020121595W WO2022077468A1 WO 2022077468 A1 WO2022077468 A1 WO 2022077468A1 CN 2020121595 W CN2020121595 W CN 2020121595W WO 2022077468 A1 WO2022077468 A1 WO 2022077468A1
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WO
WIPO (PCT)
Prior art keywords
logical channel
timer
channel parameters
network node
lch
Prior art date
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PCT/CN2020/121595
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English (en)
Inventor
Ping-Heng Kuo
Tao Tao
Original Assignee
Nokia Shanghai Bell Co., Ltd.
Nokia Solutions And Networks Oy
Nokia Technologies 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, Nokia Technologies Oy filed Critical Nokia Shanghai Bell Co., Ltd.
Priority to PCT/CN2020/121595 priority Critical patent/WO2022077468A1/fr
Priority to CN202080106251.1A priority patent/CN116420400A/zh
Publication of WO2022077468A1 publication Critical patent/WO2022077468A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/0268—Traffic management, e.g. flow control or congestion control using specific QoS parameters for wireless networks, e.g. QoS class identifier [QCI] or guaranteed bit rate [GBR]
    • 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
    • H04L47/28—Flow control; Congestion control in relation to timing considerations

Definitions

  • the present application relates to a method, apparatus, system and computer program and in particular but not exclusively to dynamic modification of LCH mapping restriction upon expiration of a cg-retransmission timer.
  • a communication system can be seen as a facility that enables communication sessions between two or more entities such as user terminals, base stations and/or other nodes by providing carriers between the various entities involved in the communications path.
  • a communication system can be provided for example by means of a communication network and one or more compatible communication devices (also referred to as station or user equipment) and/or application servers.
  • the communication sessions may comprise, for example, communication of data for carrying communications such as voice, video, electronic mail (email) , text message, multimedia, content data, time-sensitive network (TSN) flows and/or data in an industrial application such as critical system messages between an actuator and a controller, critical sensor data (such as measurements, video feed etc. ) towards a control system 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.
  • wireless communication system at least a part of a communication session, for example, between at least two stations or between at least one station and at least one application server (e.g. for video) , occurs over a wireless link.
  • wireless systems comprise public land mobile networks (PLMN) operating based on 3GPP radio standards such as E-UTRA, New Radio, satellite based communication systems and different wireless local networks, for example wireless local area networks (WLAN) .
  • PLMN public land mobile networks
  • 3GPP radio standards such as E-UTRA, New Radio, satellite based communication systems
  • WLAN wireless local area networks
  • the wireless systems can typically be divided into cells, and are therefore often referred to as cellular systems.
  • a user can access the communication system by means of an appropriate communication device or terminal.
  • a communication device of a user may be referred to as user equipment (UE) or user device.
  • UE user equipment
  • 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 users.
  • the communication device may access one or more carriers provided by the network, for example a base station of a cell, and transmit and/or receive communications on the one or more carriers.
  • CA carrier aggregation
  • DC dual connectivity
  • two carriers from different sites that is a user equipment may be dual (or multi) connected to two (or more) sites.
  • the communication system and associated devices typically operate in accordance with a given standard or specification which sets out what the various entities associated with the system are permitted to do and how that should be achieved. Communication protocols and/or parameters which shall be used for the connection are also typically defined.
  • UTRAN 3G radio
  • Other examples of communication systems are the long-term evolution (LTE) of the Universal Mobile Telecommunications System (UMTS) based on the E-UTRAN radio-access technology, and so-called 5G system (5GS) including the 5G or next generation core (NGC) and the 5G Access network based on the New Radio (NR) radio-access technology.
  • 5GS including NR are being standardized by the 3rd Generation Partnership Project (3GPP) .
  • an apparatus comprising means for, at a terminal device, causing transmission, to a network node, of a data unit conveying data from a logical channel, LCH, configured with a set of logical channel parameters, starting a first timer upon transmission of the data unit to the network node, determining to configure the logical channel with a modified set of logical channel parameters based on a status of the first timer, configuring the logical channel with the modified set of logical channel parameters based on the determination and causing transmission, to the network node, of the data unit conveying data from the logical channel configured with the modified set of logical channel parameters.
  • the set of logical channel parameters and the modified set of logical channel parameters may comprise at least one of at least one LCH mapping restriction, LCH priority, prioritised bit rate, bucket size duration and channel access priority class.
  • the at least one LCH mapping restriction may indicate a list of allowed configured grants.
  • the at least one LCH mapping restriction may indicate a list of allowed serving cells.
  • the apparatus may comprise means for receiving, from the network node, at least one configuration message indicating at least one of the set of logical channel parameters and the modified set of logical channel parameters.
  • the first timer may be a cg-retransmission timer.
  • the status of the first timer may comprise an expiration of the first timer.
  • the apparatus may comprise means for reverting to the configuration of the set of logical channel parameters for the logical channel based on at least one condition.
  • the at least one condition may comprise at least one of expiration of a second timer, reception of a control signal from the network node, confirmation that the data unit has been successfully transmitted and received and generation of the data unit.
  • the apparatus may comprise means for receiving an indication of the at least one condition from the network node.
  • a method comprising, at a terminal device, causing transmission, to a network node, of a data unit conveying data from a logical channel, LCH, configured with a set of logical channel parameters, starting a first timer upon transmission of the data unit to the network node, determining to configure the logical channel with a modified set of logical channel parameters based on a status of the first timer, configuring the logical channel with the modified set of logical channel parameters based on the determination and causing transmission, to the network node, of the data unit conveying data from the logical channel configured with the modified set of logical channel parameters.
  • the set of logical channel parameters and modified set of logical channel parameters may comprise at least one of at least one LCH mapping restriction, LCH priority, prioritised bit rate, bucket size duration and channel access priority class.
  • the at least one LCH mapping restriction may indicate a list of allowed configured grants.
  • the at least one LCH mapping restriction may indicate a list of allowed serving cells.
  • the method may comprise receiving, from the network node, at least one configuration message indicating at least one of the set of logical channel parameters and the modified set of logical channel parameters.
  • the first timer may be a cg-retransmission timer.
  • the status of the first timer may comprise an expiration of the first timer.
  • the method may comprise reverting to the configuration of the set of logical channel parameters for the logical channel based on at least one condition.
  • the at least one condition may comprise at least one of expiration of a second timer, reception of a control signal from the network node, confirmation that the data unit has been successfully transmitted and received and generation of the data unit.
  • the method may comprise receiving an indication of the at least one condition from the network node.
  • an apparatus comprising at least one processor and at least one memory including a computer program code, the at least one memory and computer program code configured to, with the at least one processor, cause the apparatus at least to, at a terminal device, cause transmission, to a network node, of a data unit conveying data from a logical channel, LCH, configured with a set of logical channel parameters, start a first timer upon transmission of the data unit to the network node, determine to configure the logical channel with a modified set of logical channel parameters based on a status of the first timer, configure the logical channel with the modified set of logical channel parameters based on the determination and cause transmission, to the network node, of the data unit conveying data from the logical channel configured with the modified set of logical channel parameters.
  • the set of logical channel parameters and the modified set of logical channel parameters may comprise at least one of at least one LCH mapping restriction, LCH priority, prioritised bit rate, bucket size duration and channel access priority class.
  • the at least one LCH mapping restriction may indicate a list of allowed configured grants.
  • the at least one LCH mapping restriction may indicate a list of allowed serving cells.
  • the apparatus may be configured to receive, from the network node, at least one configuration message indicating at least one of the set of logical channel parameters and the modified set of logical channel parameters.
  • the first timer may be a cg-retransmission timer.
  • the status of the first timer may comprise an expiration of the first timer.
  • the apparatus may be configured to revert to the configuration of the set of logical channel parameters for the logical channel based on at least one condition.
  • the at least one condition may comprise at least one of expiration of a second timer, reception of a control signal from the network node, confirmation that the data unit has been successfully transmitted and received and generation of the data unit.
  • the apparatus may be configured to receive an indication of the at least one condition from the network node.
  • a computer readable medium comprising program instructions for causing an apparatus to perform at least the following, at a terminal device, causing transmission, to a network node, of a data unit conveying data from a logical channel, LCH, configured with a set of logical channel parameters, starting a first timer upon transmission of the data unit to the network node, determining to configure the logical channel with a modified set of logical channel parameters based on a status of the first timer; configuring the logical channel with the modified set of logical channel parameters based on the determination and causing transmission, to the network node, of the data unit conveying data from the logical channel configured with the modified set of logical channel parameters.
  • the modified set of logical channel parameters may comprise at least one of at least one LCH mapping restriction, LCH priority, prioritised bit rate, bucket size duration and channel access priority class.
  • the at least one LCH mapping restriction may indicate a list of allowed configured grants.
  • the at least one LCH mapping restriction may indicate a list of allowed serving cells.
  • the apparatus may be caused to perform receiving, from the network node, at least one configuration message indicating at least one of the set of logical channel parameters and the modified set of logical channel parameters.
  • the first timer may be a cg-retransmission timer.
  • the status of the first timer may comprise an expiration of the first timer.
  • the apparatus may be caused to perform reverting to the configuration of the set of logical channel parameters for the logical channel based on at least one condition.
  • the at least one condition may comprise at least one of expiration of a second timer, reception of a control signal from the network node, confirmation that the data unit has been successfully transmitted and received and generation of the data unit.
  • the apparatus may be caused to perform receiving an indication of the at least one condition from the network node.
  • a non-transitory computer readable medium comprising program instructions for causing an apparatus to perform at least the method according to the second aspect.
  • Figure 1 shows a schematic diagram of an example 5G communication system
  • Figure 2 shows a schematic diagram of an example mobile communication device
  • Figure 3 shows a schematic diagram of an example control apparatus
  • Figure 4 shows a flowchart of a method according to an example embodiment
  • Figure 5 shows a signalling flow according to an example embodiment
  • Figure 6 shows a logic flowchart at a terminal according to an example embodiment
  • Figure 7 shows a schematic diagram of a first configured grant CG1 and a second configured grant CG2.
  • 5GS 5G System
  • 5GS 5G System
  • Network architecture in 5GS may be similar to that of LTE-advanced.
  • Base stations of NR systems may be known as next generation Node Bs (gNBs) .
  • Changes to the network architecture may depend on the need to support various radio technologies and finer QoS support, and some on-demand requirements for e.g. QoS levels to support QoE of user point of view.
  • network aware services and applications, and service and application aware networks may bring changes to the architecture. Those are related to Information Centric Network (ICN) and User-Centric Content Delivery Network (UC-CDN) approaches.
  • ICN Information Centric Network
  • UC-CDN User-Centric Content Delivery Network
  • NR may use multiple input –multiple output (MIMO) antennas, many more base stations or nodes than the LTE (a so-called small cell concept) , including macro sites operating in co-operation with smaller stations and perhaps also employing a variety of radio technologies for better coverage and enhanced data rates.
  • MIMO multiple input –multiple output
  • 5G networks may utilise network functions virtualization (NFV) which is a network architecture concept that proposes virtualizing network node functions into “building blocks” or entities that may be operationally connected or linked together to provide services.
  • a virtualized network function (VNF) may comprise one or more virtual machines running computer program codes using standard or general type servers instead of customized hardware. Cloud computing or data storage may also be utilized.
  • radio communications this may mean node operations to be carried out, at least partly, in a server, host or node operationally coupled to a remote radio head. It is also possible that node operations will be distributed among a plurality of servers, nodes or hosts. It should also be understood that the distribution of labour between core network operations and base station operations may differ from that of the LTE or even be non-existent.
  • FIG. 1 shows a schematic representation of a 5G system (5GS) 100.
  • the 5GS may comprise a user equipment (UE) 102 (which may also be referred to as a communication device or a terminal) , a 5G radio access network (5GRAN) 104, a 5G core network (5GCN) 106, one or more application functions (AF) 108 and one or more data networks (DN) 110.
  • UE user equipment
  • 5GRAN 5G radio access network
  • 5GCN 5G core network
  • AF application functions
  • DN data networks
  • the 5GCN 106 comprises functional entities.
  • the 5GCN 106 may comprise one or more access and mobility management functions (AMF) 112, one or more session management functions (SMF) 114, an authentication server function (AUSF) 116, a unified data management (UDM) 118, one or more user plane functions (UPF) 120, a unified data repository (UDR) 122 and/or a network exposure function (NEF) 124.
  • the UPF is controlled by the SMF (Session Management Function) that receives policies from a PCF (Policy Control Function) .
  • SMF Session Management Function
  • PCF Policy Control Function
  • the CN is connected to a terminal device via the radio access network (RAN) .
  • the 5GRAN may comprise one or more gNodeB (GNB) distributed unit functions connected to one or more gNodeB (GNB) centralized unit functions.
  • the RAN may comprise one or more access nodes.
  • a UPF User Plane Function
  • PSA PDU Session Anchor
  • a possible terminal device will now be described in more detail with reference to Figure 2 showing a schematic, partially sectioned view of a communication device 200.
  • a communication device is often referred to as user equipment (UE) .
  • An appropriate communication device may be provided by any device capable of sending and receiving radio signals.
  • Non-limiting examples comprise 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) , personal data assistant (PDA) or a tablet provided with wireless communication capabilities, or any combinations of these or the like.
  • MS mobile station
  • PDA personal data assistant
  • a communication device may provide, for example, communication of data for carrying communications such as voice, electronic mail (email) , text message, multimedia and so on. Users may thus be offered and provided numerous services via their communication devices. Non-limiting examples of these services comprise two-way or multi- way calls, data communication or multimedia services or simply an access to a data communications network system, such as the Internet. Users may also be provided broadcast or multicast data. Non-limiting examples of the content comprise downloads, television and radio programs, videos, advertisements, various alerts and other information.
  • a device is typically provided with at least one data processing entity 201, at least one memory 202 and other possible components 203 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 data processing, storage and other relevant control apparatus can be provided on an appropriate circuit board and/or in chipsets. This feature is denoted by reference 204.
  • the user may control the operation of the mobile device by means of a suitable user interface such as key pad 205, voice commands, touch sensitive screen or pad, combinations thereof or the like.
  • a display 208, a speaker and a microphone can be also provided.
  • a mobile communication device may comprise appropriate connectors (either wired or wireless) to other devices and/or for connecting external accessories, for example hands-free equipment, thereto.
  • the device 200 may receive signals over an air or radio interface 207 via appropriate apparatus for receiving and may transmit signals via appropriate apparatus for transmitting radio signals.
  • transceiver apparatus is designated schematically by block 206.
  • the transceiver apparatus 206 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.
  • Figure 3 shows an example embodiment of a control apparatus for a communication system, for example to be coupled to and/or for controlling a station of an access system, such as a RAN node, e.g. a base station, eNB or gNB, a relay node or a core network node such as an MME or S-GW or P-GW, or a core network function such as AMF/SMF, or a server or host.
  • a RAN node e.g. a base station, eNB or gNB
  • a relay node or a core network node such as an MME or S-GW or P-GW
  • a core network function such as AMF/SMF
  • the method may be implanted in a single control apparatus or across more than one control apparatus.
  • the control apparatus may be integrated with or external to a node or module of a core network or RAN.
  • base stations comprise a separate control apparatus unit or module.
  • control apparatus can be another network element such as a radio network controller or a spectrum controller.
  • each base station may have such a control apparatus as well as a control apparatus being provided in a radio network controller.
  • the control apparatus 300 can be arranged to provide control on communications in the service area of the system.
  • the control apparatus 300 comprises at least one memory 301, at least one data processing unit 302, 303 and an input/output interface 304. Via the interface the control apparatus can be coupled to a receiver and a transmitter of the base station.
  • the receiver and/or the transmitter may be implemented as a radio front end or a remote radio head.
  • COT Channel Occupancy Time
  • FBE Frame Based Equipment
  • RAN enhancements based on new Quality of Service (QoS) related parameters if any, e.g. survival time, burst spread, decided in SA2.
  • QoS Quality of Service
  • Time Sensitive Communication for IIoT has some distinctive requirements and characteristics. For instance, traffic patterns of TSC are typically periodic with fixed burst size, which allows the scheduler to determine resource allocation in a more judicious manner. It has been agreed in Rel-16 that a gNB may determine certain information relating to traffic flows based on TSC Assistance Information (TSCAI) from the core network, so the gNB can assign configured scheduling resources (e.g. Semi-Persistent Scheduling (SPS) and Configured Grants (CG) ) with appropriate parameters such as periodicity and transport block size, to cater for the TSC flows. For uplink, configured grants (CG) are particularly crucial for TSC traffic due to their periodic nature.
  • configured scheduling resources e.g. Semi-Persistent Scheduling (SPS) and Configured Grants (CG)
  • SPS Semi-Persistent Scheduling
  • CG Configured Grants
  • survival time means the time interval that the application can still operate without reception of an anticipated message. More formally, survival time is defined in TS22.104 as the time that an application consuming a communication service may continue without an anticipated message.
  • the survival time indicates to the communication service the time available to recover from failure.
  • the survival time may be expressed as a time period or, e.g., with cyclic traffic, as a maximum number of consecutive incorrectly received or lost messages.
  • SA2 As the survival time has now been approved by SA2 as a new QoS requirement, how RAN should be enhanced to fulfil survival time protection (i.e., to avoid consecutive message lost) is a key topic in Rel-17.
  • NR-U Compared to conventional operation in licensed band, NR-U has further constraints due to potential Listen-Before Talk (LBT) failure. Hence, mechanisms have been introduced for NR-U to facilitate its operation.
  • the UE may perform autonomous re-transmission of a pending Media Access Control (MAC) Protocol Data Unit (PDU) . This is controlled by a cg-retransmission timer, which starts when a CG-PUSCH is transmitted.
  • MAC Media Access Control
  • PDU Protocol Data Unit
  • the UE may assume the CG-Physical Uplink Shared Channel (CG-PUSCH) was not transmitted successfully, and then perform autonomous re-transmission on a subsequent CG resource.
  • DFI Downlink Feedback Information
  • HARQ Hybrid Automatic Repeat Request
  • LCH Logical Channel
  • MAC layer of a UE
  • BWP Bandwidth Part
  • allowedCG-List a new LCH mapping restriction called allowedCG-List may be configured for a LCH, such that the data from the LCH can only be conveyed by CG resources indicated on the list. More details about this feature can be found in Section 5.4.3.1.2 in TS 38.321.
  • Rel-17 WI of IIoT/URLLC enhancement considers operation in NR-U, along with RAN enhancement to tackle survival time requirement. Against this backdrop, it would be useful to enhance NR-U mechanisms in order to support survival time requirement (i.e. reduce the probability of consecutive messages lost) .
  • Packet Data Convergence Protocol PDCP
  • DRB Dedicated Radio Bearer
  • NDI non-toggled New Data Indicator
  • Figure 4 shows a flowchart of a method according to an example embodiment. The method may be performed at a terminal device.
  • the method comprises causing transmission, to a network node, of a data unit conveying data from a LCH configured with a set of logical channel parameters.
  • the method comprises starting a first timer upon transmission of the data unit to the network node.
  • the method comprises to configure the LCH with a modified set of logical channel parameters based on a status of the first timer.
  • the method comprises configuring the LCH with the modified set of logical channel parameters based on the determination.
  • a fifth step, S5 the method causing transmission, to the network node, of the data unit conveying data from the logical channel configured with the modified set of logical channel parameters.
  • the modified set of logical channel parameters may provide more reliable resources for the logical channel.
  • the set of logical channel parameters and the modified set of logical channel parameters may comprise at least one LCH mapping restriction.
  • the at least one LCH mapping restriction may indicate a list of allowed configured grants.
  • the set of logical channel parameters may be referred to as a default set of logical channel parameters.
  • the modified set of logical channel parameters may be referred to as an adapted set of logical channel parameters.
  • the sets of logical channel parameters may be a logical channel prioritisation (LCP) setting.
  • the status of the first timer may comprise an expiration of the first timer.
  • the first timer may be a cg-transmission timer.
  • the method may comprise determining to configure the logical channel with the modified set of logical channel parameters based on receiving an indication from the network node that the transmission was not successfully received.
  • the indication may comprise a DFI or a re-transmission grant.
  • the data unit may comprise a transport block (TB) .
  • the method may provide a MAC mechanism of dynamically modifying a LCH mapping restriction configured for a LCH, in accordance with the status of the cg-retransmission timer relevant to PUSCH conveyed data from this LCH.
  • the UE may dynamically modify a LCH mapping restriction configured for a LCH if it receives a signal (e.g. a DFI, or a re-transmission grant) indicating that the previous transmission relating to this LCH was not successfully received by the gNB. This may help to fulfil the survival time requirement of IIoT/TSC application in NR-U.
  • a signal e.g. a DFI, or a re-transmission grant
  • the UE may assume the PUSCH was not successfully transmitted, and changes (at least temporarily) the LCH mapping restriction configured for at least one LCH relevant to the transmitted PUSCH, e.g., making a particular configured grant as the only resource on the allowed CG list in LCH mapping restriction for a LCH. This enforces the UE to transmit the subsequent data from the same LCH on more reliable radio resource, thereby reducing the probability of consecutive transmission error.
  • the method may comprise receiving, from the network node, at least one configuration message indicating at least one of the set of logical channel parameters and the modified set of logical channel parameters.
  • at least one configuration message may be provided from a gNB to a UE.
  • the at least one configuration message may comprise a default LCH mapping restriction for at least one LCH and a modified LCH mapping restriction for the at least one LCH based on status of a cg-retransmission timer (e.g. upon timer expiration) .
  • the default LCH mapping restriction does not impose any restriction (i.e. the data from this LCH may be mapped to any resource)
  • the modified LCH mapping restriction imposes certain restriction regarding how data from this LCH can be mapped. That is, LCH mapping restriction is imposed only if the timer is expired, otherwise the LCH mapping restriction is lifted.
  • the network node may determine to provide the UE with the modified set of logical channel parameters for the logical channel if the logical channel has an associated survival time requirement.
  • the UE may determine if the logical channel has a survival time requirement (and so if it should retransmit the data unit using a modified set of logical channel parameters) based on whether the logical channel is configured with both a set of logical channel parameters and a modified set of logical channel parameters
  • the UE may modify the LCH mapping restriction (from the default setting to the modified setting) of the at least one LCH based on the status of a cg-retransmission timer.
  • the UE may, further, revert the LCH mapping restriction from the adapted setting back to the default setting of the at least one LCH.
  • the method may comprise reverting to the configuration of the set of logical channel parameters for the LCH based on at least one condition.
  • the at least one condition may comprise at least one of expiration of a second timer, reception of a control signal from the network node, confirmation that the data unit has been successfully transmitted and received and generation of the data unit.
  • the second timer may be referred to as an LCP adaptation timer.
  • the control signal from the network node may comprise a MAC CE or a DCI.
  • the UE may fallback to the default set of logical channel parameters upon reception of a control signal from a gNB (e.g. a MAC CE or a DCI) .
  • the UE may fallback to the default set of logical channel parameters once at least one TB is generated using the adapted LCH mapping restriction, or when the UE has confirmed that a TB is successfully transmitted and/or received.
  • the method may comprise receiving an indication of the condition from the network node.
  • the condition for the UE to fallback to the default set of logical channel parameters e.g. the value of LCP adaptation timer
  • the at least one configuration message may comprise an instruction relating to when to fallback to a default set of logical channel parameters for the at least one LCH.
  • Figure 5 shows a signalling flow according to an example embodiment.
  • the gNB configures the UE (e.g. via Radio Resource Control (RRC) ) with a default LCH mapping restriction and an adapted LCH mapping restriction for a LCH.
  • RRC Radio Resource Control
  • a CG-PUSCH relating to this LCH is transmitted based on the default LCH mapping restriction and hence a cg-retransmission timer is started.
  • the UE changes the LCH mapping restriction of the LCH when the cg-retransmission timer is expired (e.g., because no downlink feedback information (DFI) is received at the UE)
  • DFI downlink feedback information
  • a new CG-PUSCH is transmitted based on the adapted LCH mapping restriction.
  • the UE may further start another timer called e.g. LCP adaptation timer.
  • LCP adaptation timer On expiry of the LCP adaptation timer, the UE changes the LCH mapping restriction for the LCH back to the default setting.
  • Figure 6 shows a UE logic according to an example embodiment used to determine if the UE should change an LCH mapping restriction for a LCH upon expiration of a cg-retransmission timer.
  • the UE may check whether any LCH mapped to the TB whose transmission triggered the timer has survival time requirement. This may be implied based on whether the LCH is configured with both default and adapted LCH mapping restriction (typically the gNB should only configure a LCH with both settings if the traffic corresponding to this LCH has survival time requirement) . If so, the UE may change the LCH mapping restriction setting. Otherwise, it would act as usual, i.e. only perform autonomous retransmission of this TB.
  • Figure 7 shows an example embodiment in which a UE has a traffic flow with survival time requirement.
  • the traffic flow is mapped to a DRB.
  • the gNB has configured at least two CGs in a BWP, namely CG1 and CG2.
  • CG1 is configured with a reliability target fitting the QoS requirement (e.g. Packet Error Rate (PER) ) of traffics conveyed by the DRB.
  • QoS requirement e.g. Packet Error Rate (PER)
  • CG2 is configured with a higher reliability target than CG1, with e.g. lower Modulation and Coding Scheme (MCS) and/or more repetitions in each CG occasion.
  • MCS Modulation and Coding Scheme
  • the LCH corresponding to this DRB is configured with a default LCH mapping restriction where CG1 is on the allowedCG-List. This means the data from this LCH by default can be mapped to radio resources associating to CG1.
  • the gNB In addition to this default LCH mapping restriction setting, the gNB also configures an adapted setting wherein only CG2 is on the allowedCG-List (i.e. CG1 is removed from the list in this adapted setting) .
  • the UE should switch to this adapted setting for this LCH when the related cg-retransmission timer is expired (i.e., no DFI has been received) .
  • the UE When a PUSCH is transmitted on CG1, which triggers a cg-retransmission timer to start according to the current specifications, the UE observes if it receives a DFI from the gNB while the timer is running. If the UE does not receive DFI and the timer is expired, the UE further checks if the pending TB contains any data from a LCH configured with adapted setting (meaning data from this LCH has survival time requirement) . If so, the UE should switch the LCH mapping restriction of this LCH from the default setting to the adapted setting.
  • the upcoming data from this LCH should follow the new mapping restriction rule, to generate new TB (s) for new transmissions.
  • the subsequent data from this LCH should be mapped to CG2 only (no longer to CG1) , until it is switched back to the default setting again (e.g. upon expiration of LCP adaptation timer) .
  • the at least one LCH mapping restriction may indicate a list of allowed serving cells.
  • the proposed scheme may be applied to LCH mapping restriction relating to allowed serving cells.
  • the UE may have a default LCH mapping restriction with allowed serving cells in both licensed and unlicensed band and a modified LCH mapping restriction with allowed serving cells in the licensed band only.
  • the UE upon the expiration of a first, e.g., cg-retransmission, timer or receiving an indication from the network node that the transmission was not successful, the UE is caused to only use resources in a licensed band to transmit subsequent data from the LCH, to make sure the next packet will not be transmitted unsuccessfully due to e.g., LBT failure in the unlicensed band, and thereby reducing the probability of consecutive error.
  • a first e.g., cg-retransmission, timer or receiving an indication from the network node that the transmission was not successful
  • the UE upon the expiration of a first, e.g., cg-retransmission, timer or receiving an indication from the network node that the transmission was not successful, the UE is caused to only use resources in a licensed band to transmit subsequent data from the LCH, to make sure the next packet will not be transmitted unsuccessfully due to e.g., LBT failure in the unlicensed band, and thereby reducing the probability of consecutive error.
  • the method may be extended to the adaptation of other parameters in the LCP setting, including LCH priority, Prioritised Bit Rate (PBR) , Bucket Size Duration (BSD) and channel access priority class (CAPC) .
  • LCH priority Prioritised Bit Rate
  • BSD Bucket Size Duration
  • CAPC channel access priority class
  • the set of logical channel parameters setting may comprise an LCH priority, PBR, BSD and CAPC.
  • the default set of logical channel parameters is configured by the network node, without additional configuration of a modified set of logical channel parameters.
  • the modified set of logical channel parameters may be a setting that is already known (e.g. fixed in specification) , so no explicit configuration is needed.
  • the default set of logical channel parameters may be a setting that is already known (e.g. fixed in specification) , so no explicit configuration is needed.
  • cg-retransmission timer In addition to changing the set of logical channel parameters, other types of adaptation may be undertaken upon expiration of cg-retransmission timer, such as CAPC upgrading for the LCH or activation of PDCP duplication of the DRB associated to the LCH.
  • the UE when a data unit of traffic with survival time requirement is transmitted in the NR-unlicensed spectrum, the UE may be enforced to send subsequent data in a more reliable way, if the UE detects that the data unit was potentially not successfully received by the gNB (i.e. expiration of cg-retransmission timer) . Hence, the probability of consecutive transmission failure, that may result in survival time violation, may be reduced.
  • the method may be implemented in a user equipment as described with reference to Figure 2.
  • An apparatus may comprise means for , at a terminal device, causing transmission, to a network node, of a data unit conveying data from a logical channel, LCH, configured with a set of logical channel parameters, starting a first timer upon transmission of the data unit to the network node, determining to configure the logical channel with a modified set of logical channel parameters based on a status of the first timer, configuring the logical channel with the modified set of logical channel parameters based on the determination and causing transmission, to the network node, of the data unit conveying data from the logical channel configured with the modified set of logical channel parameters.
  • apparatuses may comprise or be coupled to other units or modules etc., such as radio parts or radio heads, used in or for transmission and/or reception.
  • apparatuses have been described as one entity, different modules and memory may be implemented in one or more physical or logical entities.
  • the various example embodiments may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects of the invention 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 the invention is not limited thereto. While various aspects of the invention 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 embodiments of this invention may be implemented by computer software executable by a data processor of the mobile device, such as in the processor entity, or by hardware, or by a combination of software and hardware.
  • Computer software or program also called program product, including software routines, applets and/or macros, may be stored in any apparatus-readable data storage medium and they comprise program instructions to perform particular tasks.
  • a computer program product may comprise one or more computer-executable components which, when the program is run, are configured to carry out embodiments.
  • the one or more computer-executable components may be at least one software code or portions of it.
  • any blocks of the logic flow as in the Figures 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 physical media is a non-transitory media.
  • 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 comprise one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) , application specific integrated circuits (ASIC) , FPGA, gate level circuits and processors based on multi core processor architecture, as non-limiting examples.
  • Example embodiments of the inventions may be practiced in various components such as integrated circuit modules.
  • the design of integrated circuits is by and large a highly automated process.
  • Complex and powerful software tools are available for converting a logic level design into a semiconductor circuit design ready to be etched and formed on a semiconductor substrate.

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

Abstract

L'invention concerne un appareil, ledit appareil comportant des moyens destinés, au niveau d'un dispositif terminal, à: provoquer la transmission, à un nœud de réseau, d'une unité de données acheminant des données en provenance d'un canal logique, LCH, configuré avec un ensemble de paramètres de canal logique, démarrer un premier temporisateur suite à la transmission de l'unité de données au nœud de réseau, déterminer qu'il convient de configurer le canal logique avec un ensemble modifié de paramètres de canal logique d'après un état du premier temporisateur, configurer le canal logique avec l'ensemble modifié de paramètres de canal logique d'après la détermination et provoquer la transmission, au nœud de réseau, de l'unité de données acheminant des données en provenance du canal logique configuré avec l'ensemble modifié de paramètres de canal logique.
PCT/CN2020/121595 2020-10-16 2020-10-16 Procédé, appareil et programme informatique WO2022077468A1 (fr)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200314681A1 (en) * 2019-03-28 2020-10-01 Nokia Technologies Oy Uplink transmission methods based on collision-triggered adaptation

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200314681A1 (en) * 2019-03-28 2020-10-01 Nokia Technologies Oy Uplink transmission methods based on collision-triggered adaptation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
MEDIATEK INC.: "Issues on retransmissions across different configured grant configurations", 3GPP DRAFT; R2-2000841, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG2, no. Electronic meeting; 20200224 - 20200306, 13 February 2020 (2020-02-13), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France , XP051848632 *

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