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WO2025039674A1 - Procédé de transmission de données et appareil - Google Patents

Procédé de transmission de données et appareil Download PDF

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Publication number
WO2025039674A1
WO2025039674A1 PCT/CN2024/097649 CN2024097649W WO2025039674A1 WO 2025039674 A1 WO2025039674 A1 WO 2025039674A1 CN 2024097649 W CN2024097649 W CN 2024097649W WO 2025039674 A1 WO2025039674 A1 WO 2025039674A1
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WIPO (PCT)
Prior art keywords
radio bearer
data
downlink
signaling
data transmission
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PCT/CN2024/097649
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English (en)
Chinese (zh)
Inventor
信金灿
许森
许话
齐飞
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China Telecom Intelligent Network Technology Co Ltd
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China Telecom Intelligent Network Technology Co Ltd
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Publication of WO2025039674A1 publication Critical patent/WO2025039674A1/fr
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/28—Discontinuous transmission [DTX]; Discontinuous reception [DRX]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W68/00—User notification, e.g. alerting and paging, for incoming communication, change of service or the like

Definitions

  • the present application relates to the field of wireless communications, and in particular to a method and device for data transmission.
  • 5G NR introduces a new state, the Inactive state, which aims to allow the User Equipment (UE) to quickly enter the Connected state to send data, while reducing the signaling overhead caused by the mobile process and state transfer process.
  • the UE's Non-access Stratum (NAS) remains in the Connected state, but the air interface corresponding to the UE's Access Stratum (AS) is temporarily suspended.
  • the terminal first needs to change from the Inactive state to the Connected state, and then send data after the control plane and the user plane on the network side establish a connection.
  • 3GPP carried out research on uplink small data transmission (Mobile Original Small Data Transmission, MO-SDT) in Rel-17, with the aim of reducing the access latency of the terminal sending uplink small data packets in the Inactive state.
  • 3GPP Rel-18 carried out research on downlink small data transmission (Mobile Terminated Small Data Transmission, referred to as MT-SDT).
  • the source base station when the source base station receives downlink data (or needs to page the terminal due to other reasons), the source base station sends the RAN paging message to the target base station through the Xn interface, which includes the paging identifier, paging reason, etc.
  • the centralized unit (CU) and distributed unit (DU) of the 5G next generation Node B (gNB) establish the UE context through the UE context setup process.
  • the gNB-CU first sends a UE CONTEXT SETUP REQUEST message to the gNB-DU.
  • the gNB-DU successfully establishes the UE context, it replies with a UE CONTEXT SETUP RESPONSE to the gNB-CU.
  • a method for data transmission including: a first base station centralized entity receives a first message sent by a core network, wherein the first message includes at least one of the following: a first indication of downlink signaling, a first indication of downlink user plane data, and a first indication of upcoming downlink data; the first base station centralized entity sends a first request message and/or a first paging message to a first base station separated entity, wherein the first request message includes at least one of the following: small data transmission signaling radio bearer configuration, small data transmission data radio bearer configuration, signaling radio bearer configuration, and data radio bearer configuration; the first paging message includes an inactive downlink small data transmission indication.
  • the first downlink signaling indication includes at least one of the following: a downlink signaling indication, a downlink signaling size indication, wherein the downlink signaling indication is used to indicate that the first base station receives downlink signaling sent by the core network, and the downlink signaling size indication is used to indicate the size of the downlink signaling sent by the core network received by the first base station.
  • the first indication of downlink user plane data includes at least one of the following: a downlink user plane data indication, a downlink user plane data size indication, wherein the downlink user plane data indication is used to indicate that the first base station receives user plane data sent by the core network, and the downlink user plane data size indication is used to indicate the size of user plane data sent by the core network to be received by the first base station.
  • the first indication of the upcoming downlink data includes at least one of the following: an indication of the upcoming downlink user plane data, an indication of the upcoming downlink signaling, wherein the indication of the upcoming downlink user plane data is used to indicate that the core network is about to send downlink user plane data to the first base station, and the indication of the upcoming downlink signaling is used to indicate that the core network is about to send downlink signaling to the first base station.
  • the first base station centralized entity sends a second message to the second base station, and the second message includes at least one of the following: a downlink small data transmission indication, a downlink small data transmission data volume, a downlink signaling indication, a downlink signaling data volume indication, a downlink user plane data indication, and a downlink user plane data data volume indication, wherein the downlink small data transmission indication is used to characterize whether it is an inactive downlink small data transmission; the downlink small data transmission data volume is used to characterize the total data volume of all downlink user plane data and downlink signaling mapped to the inactive downlink small data dedicated bearer; the downlink signaling indication is used to characterize that the total data of the inactive downlink small data transmission includes downlink signaling; the downlink signaling data volume indication is used to characterize the total data volume of all downlink signaling mapped to the inactive downlink small data transmission dedicated bearer; the downlink user plane data indication is used to characterize that the total data of the inactive downlink small data
  • the downlink small data transmission data size includes a downlink signaling indication
  • the downlink small data transmission data size includes a downlink user plane data indication it is determined to establish a data radio bearer
  • the first request message is at least one of a terminal context establishment request message and a terminal er.
  • the first request message when the first request message is a terminal context establishment request message, includes at least one of the following: a signaling radio bearer establishment list and a data radio bearer establishment list, wherein the signaling radio bearer establishment list contains one or more signaling radio bearer establishment items, and the data radio bearer establishment list contains one or more data radio bearer establishment items.
  • the signaling radio bearer establishment item includes at least one of a signaling radio bearer identifier and a radio link layer control bearer configuration for inactive small data transmission.
  • the data radio bearer establishment item includes at least one of a data radio bearer identifier and a radio link layer control bearer configuration for inactive small data transmission.
  • the first request message when the first request message is a terminal context modification request message, includes at least one of the following: a signaling radio bearer establishment list and a data radio bearer establishment list, wherein the signaling radio bearer establishment list contains one or more signaling radio bearer establishment items, and the data radio bearer establishment list contains one or more data radio bearer establishment items.
  • the signaling radio bearer establishment item includes at least one of a signaling radio bearer identifier, a radio link layer control bearer configuration for inactive small data transmission, and an inactive downlink small data transmission indication.
  • the data radio bearer establishment item includes at least one of a data radio bearer identifier, a radio link layer control bearer configuration for inactive small data transmission, and an inactive downlink small data transmission indication.
  • the value range of the signaling radio bearer identifier is a first interval
  • the first value in the first interval represents a signaling radio bearer used to transmit application layer measurement reporting information
  • the second value in the first interval represents a signaling radio bearer used to transmit experience quality information to a secondary node, wherein the first value is less than the second value.
  • the value range of the data radio bearer identifier is a second interval.
  • the wireless link layer control bearer configuration is used for data packet transmission of the signaling wireless bearer for the inactive downlink small data transmission indicated by the signaling wireless bearer identifier.
  • the first base station separation entity receives a first request sent by the first base station concentration entity. After the message is received, and if the wireless link layer control bearer configuration is included in the data wireless bearer establishment list and the first base station separation entity supports the wireless link layer control bearer configuration, the wireless link layer control bearer configuration is used for the data packet transmission of the data wireless bearer for the inactive downlink small data transmission indicated by the data wireless bearer identifier.
  • the first base station centralized entity receives a terminal context establishment response message fed back by the first base station separation entity, wherein the terminal context establishment response message includes the result of the requested data radio bearer and/or signaling radio bearer.
  • the terminal context establishment response message includes at least one of a data radio bearer establishment list, a signaling radio bearer establishment list, a signaling radio bearer establishment failure list, and a data radio bearer establishment failure list.
  • the data radio bearer establishment list includes one or more data radio bearer establishment items, and the data radio bearer establishment items include data radio bearer identifiers.
  • the signaling radio bearer establishment list includes one or more signaling radio bearer establishment items, and the signaling radio bearer establishment items include a signaling radio bearer identifier.
  • the signaling radio bearer establishment failure list includes one or more signaling radio bearer establishment failure items, and at least one signaling radio bearer establishment failure item includes a signaling radio bearer identifier and a signaling radio bearer establishment failure reason, wherein the signaling radio bearer establishment failure reason includes an inability to support inactive downlink small data transmission.
  • the data radio bearer establishment failure list includes one or more data radio bearer establishment failure items, and at least one data radio bearer establishment failure item includes a data radio bearer identifier and a data radio bearer establishment failure reason, wherein the data radio bearer establishment failure reason includes an inability to support inactive downlink small data transmission.
  • the first base station centralized entity receives a terminal context modification response message fed back by the first base station separation entity, wherein the terminal context modification response message includes the result of the requested data radio bearer and/or signaling radio bearer.
  • the terminal context modification response message includes at least one of a data radio bearer modification list, a signaling radio bearer establishment failure list, a signaling radio bearer establishment list, and a signaling radio bearer modification list.
  • the data radio bearer modification list includes one or more data radio bearer modification items.
  • the data radio bearer modification item includes a data radio bearer identifier.
  • the signaling radio bearer establishment failure list includes one or more signaling radio bearer establishment failure items, and at least one signaling radio bearer establishment failure item includes a signaling radio bearer identifier and a signaling radio bearer establishment failure reason.
  • the signaling radio bearer establishment list includes one or more signaling radio bearer establishment items, and the signaling radio bearer establishment items include a signaling radio bearer identifier.
  • the signaling radio bearer modification list includes one or more signaling radio bearer modification items, and the signaling radio bearer modification items include a signaling radio bearer identifier.
  • the first paging message includes at least one of the following: an inactive downlink small data transmission indication and a data volume of the downlink small data transmission.
  • the inactive downlink small data transmission indication is sent to the user terminal through the first base station separation entity.
  • the method also includes: the first base station centralized entity receives a user terminal context acquisition request message sent by the second base station, wherein the user terminal context acquisition request message includes at least one of the following: an inactive downlink small data transmission indication and a small data transmission indication, the inactive downlink small data transmission indication is an indication for inactive downlink small data transmission, and the small data transmission indication is an indication for inactive uplink small data transmission.
  • the method also includes: when the first base station centralized entity agrees to the user terminal context acquisition request message, the first base station centralized entity sends a user terminal context response message to the second base station, wherein the user terminal context response message includes at least one of the following: inactive downlink small data transmission user plane data information, downlink small data transmission signaling information, and other terminal context information.
  • the method also includes: when the first base station centralized entity does not agree to the user terminal context acquisition request message, the first base station centralized entity sends a partial user terminal context message to the second base station, wherein the partial user terminal context message includes at least one of the following: inactive downlink small data transmission user plane data information and inactive downlink small data transmission signaling information.
  • the inactive downlink small data transmission user plane data information includes at least one of the following: inactive downlink small data transmission user plane data auxiliary information and inactive downlink small data transmission user plane data volume, wherein the inactive downlink small data transmission user plane data auxiliary information includes first information indicating that there is no subsequent downlink small data transmission data and/or second information indicating that there is subsequent downlink small data transmission data, the inactive state
  • the downlink small data transmission user plane data volume includes a first data volume representing the data volume size transmitted by a single data packet and/or a second data volume representing the data volume size transmitted by each data packet in multiple data packets.
  • the inactive downlink small data transmission signaling information includes at least one of the following: inactive downlink small data transmission signaling auxiliary information and inactive downlink small data transmission signaling data volume, wherein the inactive downlink small data transmission signaling auxiliary information includes a signaling type.
  • the first message further includes at least one of the following: inactive downlink small data transmission user plane data information and inactive downlink small data transmission signaling information.
  • the inactive downlink small data transmission user plane data information includes at least one of the following: inactive downlink small data transmission user plane data auxiliary information and inactive downlink small data transmission user plane data volume, wherein the inactive downlink small data transmission user plane data auxiliary information includes first information indicating that there is no subsequent downlink small data transmission data and/or second information indicating that there is subsequent downlink small data transmission data, and the inactive downlink small data transmission user plane data volume includes a first data volume indicating the size of data transmitted by a single data packet and/or a second data volume indicating the size of data transmitted by each data packet in multiple data packets.
  • the inactive downlink small data transmission signaling information includes at least one of the following: inactive downlink small data transmission signaling auxiliary information and inactive downlink small data transmission signaling data volume, wherein the inactive downlink small data transmission signaling auxiliary information includes signaling type.
  • the first base station centralized entity includes a first base station centralized entity user plane and a first base station centralized entity control plane. After the first base station centralized entity receives the first message, the first base station centralized entity user plane sends a downlink data notification message to the first base station centralized entity control plane.
  • the downlink data notification message includes the data volume size of the inactive downlink small data transmission, wherein the data volume size of the inactive downlink small data transmission includes at least one of a downlink signaling indication and a downlink user plane data indication, the downlink signaling indication includes the data volume size of the downlink signaling, and the downlink user plane data indication includes the data volume size of the downlink user plane data.
  • a method for data transmission including: a first base station separation entity receives a first request message and/or a first paging message sent by a first base station centralized entity, wherein the first request message includes at least one of the following: small data transmission signaling radio bearer configuration, small data transmission data radio bearer configuration, signaling radio bearer configuration, data radio bearer configuration; the first paging message includes an inactive downlink small data transmission indication.
  • the first request message is at least one of a terminal context establishment request message and a terminal context modification request message.
  • the first request message when the first request message is a terminal context establishment request message, includes at least one of the following: a signaling radio bearer establishment list and a data radio bearer establishment list, wherein the signaling radio bearer establishment list contains one or more signaling radio bearer establishment items, and the data radio bearer establishment list contains one or more data radio bearer establishment items.
  • the signaling radio bearer establishment item includes at least one of a signaling radio bearer identifier and a radio link layer control bearer configuration for inactive small data transmission.
  • the data radio bearer establishment item includes at least one of a data radio bearer identifier and a radio link layer control bearer configuration for inactive small data transmission.
  • the first request message when the first request message is a terminal context modification request message, includes at least one of the following: a signaling radio bearer establishment list and a data radio bearer establishment list, wherein the signaling radio bearer establishment list contains one or more signaling radio bearer establishment items, and the data radio bearer establishment list contains one or more data radio bearer establishment items.
  • the signaling radio bearer establishment item includes at least one of a signaling radio bearer identifier, a radio link layer control bearer configuration for inactive small data transmission, and an inactive downlink small data transmission indication.
  • the data radio bearer establishment item includes at least one of a data radio bearer identifier, a radio link layer control bearer configuration for inactive small data transmission, and an inactive downlink small data transmission indication.
  • the first base station separation entity when the first request message is a terminal context establishment request message and the first base station separation entity successfully establishes the terminal context based on the first request message, the first base station separation entity feeds back a terminal context establishment response message to the first base station centralized entity, wherein the terminal context establishment response message includes the result of the requested data radio bearer and/or signaling radio bearer.
  • the terminal context establishment response message includes at least one of a data radio bearer establishment list, a signaling radio bearer establishment list, a signaling radio bearer establishment failure list, and a data radio bearer establishment failure list.
  • the data radio bearer establishment list includes one or more data radio bearer establishment items, and the data radio bearer establishment items include a data radio bearer identifier.
  • the signaling radio bearer establishment list includes one or more signaling radio bearer establishment items, and the signaling radio bearer establishment items include signaling radio bearer identifiers.
  • the signaling radio bearer establishment failure list includes one or more signaling radio bearer establishment failure items, at least one signaling radio bearer establishment failure item includes a signaling radio bearer identifier and a signaling radio bearer establishment failure reason, wherein the signaling radio bearer establishment failure reason includes an inability to support inactive downlink Small data transfer.
  • the data radio bearer establishment failure list includes one or more data radio bearer establishment failure items, and at least one data radio bearer establishment failure item includes a data radio bearer identifier and a data radio bearer establishment failure reason, wherein the data radio bearer establishment failure reason includes an inability to support inactive downlink small data transmission.
  • the first base station separation entity when the first request message is a terminal context modification request message and the first base station separation entity successfully modifies the terminal context according to the first request message, the first base station separation entity feeds back a terminal context modification response message to the first base station centralized entity, wherein the terminal context modification response message includes the result of the requested data radio bearer and/or signaling radio bearer.
  • the terminal context modification response message includes at least one of a data radio bearer modification list, a signaling radio bearer establishment failure list, a signaling radio bearer establishment list, and a signaling radio bearer modification list.
  • the data radio bearer modification list includes one or more data radio bearer modification items, and the data radio bearer modification items include a data radio bearer identifier.
  • the signaling radio bearer establishment failure list includes one or more signaling radio bearer establishment failure items, and at least one signaling radio bearer establishment failure item includes a signaling radio bearer identifier and a signaling radio bearer establishment failure reason.
  • the signaling radio bearer establishment list includes one or more signaling radio bearer establishment items, and the signaling radio bearer establishment items include signaling radio bearer identifiers.
  • the signaling radio bearer modification list includes one or more signaling radio bearer modification items, and the signaling radio bearer modification items include a signaling radio bearer identifier.
  • the first paging message includes at least one of the following: an inactive downlink small data transmission indication and a data volume of the downlink small data transmission.
  • a method for data transmission including: a second base station receives a second message sent by a centralized entity of the first base station, the second message comprising at least one of the following: a downlink small data transmission indication, a downlink small data transmission data volume size, a downlink signaling indication, a downlink signaling data volume size indication, a downlink user plane data indication, and a downlink user plane data data volume size indication, wherein the downlink small data transmission indication is used to characterize whether it is an inactive downlink small data transmission; the downlink small data transmission data volume size is used to characterize the total data volume size of all downlink user plane data and downlink signaling mapped to an inactive downlink small data dedicated bearer; the downlink signaling indication is used to characterize that the total data of the inactive downlink small data transmission includes downlink signaling; the downlink signaling The data volume size indication is used to characterize the total data volume of all downlink signaling mapped to the dedicated bearer for inactive downlink
  • the downlink small data transmission data size includes a downlink signaling indication
  • the downlink small data transmission data size includes a downlink user plane data indication it is determined to establish a data radio bearer
  • the method further includes: the second base station receives a radio resource control recovery request message sent by the user terminal, wherein the recovery reason of the radio resource control recovery request message is an inactive downlink small data transmission indication.
  • the method also includes: the second base station sends a user terminal context acquisition request message to the first base station centralized entity, wherein the user terminal context acquisition request message includes at least one of the following: an inactive downlink small data transmission indication and a small data transmission indication, the inactive downlink small data transmission indication is an indication for inactive downlink small data transmission, and the small data transmission indication is an indication for inactive uplink small data transmission.
  • the method also includes: when the first base station centralized entity agrees to the user terminal context acquisition request message, the second base station receives the user terminal context response message sent by the first base station centralized entity, wherein the user terminal context response message includes at least one of the following: inactive downlink small data transmission user plane data information, downlink small data transmission signaling information, and other terminal context information.
  • the method also includes: when the first base station centralized entity does not agree to the user terminal context acquisition request message, the second base station receives part of the user terminal context message sent by the first base station centralized entity, wherein the part of the user terminal context message includes at least one of the following: inactive downlink small data transmission user plane data information and inactive downlink small data transmission signaling information.
  • the inactive downlink small data transmission user plane data information includes at least one of the following: inactive downlink small data transmission user plane data auxiliary information and inactive downlink small data transmission user plane data volume, wherein the inactive downlink small data transmission user plane data auxiliary information includes first information indicating that there is no subsequent downlink small data transmission data and/or second information indicating that there is subsequent downlink small data transmission data, and the inactive downlink small data transmission user plane data volume includes a first data volume indicating the size of data transmitted by a single data packet and/or a second data volume indicating the size of data transmitted by each data packet in multiple data packets.
  • the inactive downlink small data transmission signaling information includes at least one of the following: The signaling auxiliary information of downlink small data transmission in an active state and the signaling data volume of the downlink small data transmission in an inactive state, wherein the signaling auxiliary information of the downlink small data transmission in an inactive state includes the signaling type.
  • the second base station includes a second base station centralized entity user plane and a second base station centralized entity control plane. After the second base station centralized entity receives the second message, the second base station centralized entity user plane sends a downlink data notification message to the second base station centralized entity control plane.
  • the downlink data notification message includes the data volume size of the inactive downlink small data transmission, wherein the data volume size of the inactive downlink small data transmission includes at least one of a downlink signaling indication and a downlink user plane data indication, the downlink signaling indication includes the data volume size of the downlink signaling, and the downlink user plane data indication includes the data volume size of the downlink user plane data.
  • the second base station includes a second base station centralized entity and a second base station separated entity, wherein the second base station centralized entity sends a first request message and/or a first paging message to the second base station separated entity, wherein the first request message includes at least one of the following: small data transmission signaling radio bearer configuration, small data transmission data radio bearer configuration, signaling radio bearer configuration, data radio bearer configuration; the first paging message includes an inactive downlink small data transmission indication.
  • the first request message is at least one of a terminal context establishment request message and a terminal context modification request message.
  • the first request message when the first request message is a terminal context establishment request message, includes at least one of the following: a signaling radio bearer establishment list and a data radio bearer establishment list, wherein the signaling radio bearer establishment list contains one or more signaling radio bearer establishment items, and the data radio bearer establishment list contains one or more data radio bearer establishment items.
  • the first request message when the first request message is a terminal context modification request message, includes at least one of the following: a signaling radio bearer establishment list and a data radio bearer establishment list, wherein the signaling radio bearer establishment list contains one or more signaling radio bearer establishment items, and the data radio bearer establishment list contains one or more data radio bearer establishment items.
  • the first paging message includes at least one of the following: an inactive downlink small data transmission indication and a data volume of the downlink small data transmission.
  • a data transmission device including: a first receiving module, used to receive a first message sent by a core network, wherein the first message includes at least one of the following: a first indication of downlink signaling, a first indication of downlink user plane data, and a first indication of downlink data to be arrived; a first sending module, used to send a first request message and/or a first paging message to a first base station separation entity, wherein the first request message It includes at least one of the following: small data transmission signaling radio bearer configuration, small data transmission data radio bearer configuration, signaling radio bearer configuration, data radio bearer configuration; the first paging message includes an inactive downlink small data transmission indication.
  • another data transmission device including: a second receiving module, used to receive a first request message and/or a first paging message sent by a first base station centralized entity, wherein the first request message includes at least one of the following: small data transmission signaling radio bearer configuration, small data transmission data radio bearer configuration, signaling radio bearer configuration, data radio bearer configuration; the first paging message includes an inactive downlink small data transmission indication.
  • another data transmission device including: a third receiving module, used to receive a second message sent by a first base station centralized entity, the second message including at least one of the following: a downlink small data transmission indication, a downlink small data transmission data volume, a downlink signaling indication, a downlink signaling data volume indication, a downlink user plane data indication, and a downlink user plane data data volume indication, wherein the downlink small data transmission indication is used to characterize whether it is an inactive downlink small data transmission; the downlink small data transmission data volume indication is used to characterize the total data volume of all downlink user plane data and downlink signaling mapped to an inactive downlink small data dedicated bearer; the downlink signaling indication is used to characterize that the total data of the inactive downlink small data transmission includes downlink signaling; the downlink signaling data volume indication is used to characterize the total data volume of all downlink signaling mapped to an inactive downlink small data transmission dedicated bearer; the downlink user plane data
  • FIG1 is a flow chart of a method for data transmission provided according to an embodiment of the present application.
  • FIG2 is a partial flow chart a of a method for data transmission provided by an embodiment of the present application.
  • FIG3 is a partial flow chart b of a method for data transmission provided in an embodiment of the present application.
  • FIG4 is a partial flow chart c of a method for data transmission provided in an embodiment of the present application.
  • FIG5 is a partial flow chart d of a data transmission method provided in an embodiment of the present application.
  • 3GPP 3rd Generation Partnership Project: An international standardization organization dedicated to developing standards for mobile communication technologies. It is composed of major telecommunications standardization organizations around the world, including the European Telecommunications Standards Institute (ETSI), the American Telecommunications Industry Association (ATIS), and the China Telecommunications Technology Standardization Research Institute (CATR). 3GPP's mission is to develop and maintain standards for mobile communication technologies, including mobile network architecture, wireless access technology, protocol specifications, etc., to promote the development and interoperability of the global mobile communication industry.
  • ETSI European Telecommunications Standards Institute
  • ATIS American Telecommunications Industry Association
  • CAR China Telecommunications Technology Standardization Research Institute
  • NR New Radio: refers to the new generation of air interface technology used for wireless communications in 5G networks. This technology can work in both independent and non-independent modes, with higher spectrum efficiency, lower latency, larger capacity and higher reliability, and can support more users to connect simultaneously, faster data transmission speeds and wider coverage.
  • PDCP Packet Data Convergence Protocol
  • LTE Long Term Evolution
  • the PDCP layer is located at the third layer in the LTE protocol stack and is responsible for processing packet data on the IP layer, including compression, encryption, integrity protection and retransmission functions. It plays an important role in improving network efficiency and ensuring data security.
  • MAC Medium Access Control: is a term used in computer networks to describe the method of controlling multiple devices to share the same physical media. It defines the rules and protocols for data transmission on shared media. MAC is mainly responsible for the following: media access control, media frame format, media conflict detection and handling, and media access control protocol.
  • DRB Data Radio Bearer
  • LTE and 5G used to carry user data and transmit control signaling.
  • DRB is implemented through logical channels and transport channels. Logical channels are used to assign different types of user data to different transport channels, while transport channels are responsible for transmitting data to base stations or user devices. DRB can support multiple logical channels and transport channels at the same time to meet different types of communication needs.
  • PUSCH Physical Uplink Shared Channel: A physical channel used in LTE and 5G wireless communication systems. It is used to transmit uplink data between user equipment (UE) and base stations.
  • UE user equipment
  • MT-SDT inactive downlink small data transmission
  • the source base station needs to send MT-SDT related information to the target base station through the Xn interface application protocol (Xn Application Protocol, referred to as XnAP) message, and the target base station CU and DU need to establish relevant UE contexts to support MT-SDT data.
  • XnAP Xn Application Protocol
  • the current 3GPP 5G protocol cannot meet the demand and needs to be enhanced in a new way to better support the transmission of small downlink data packets in the inactive state.
  • the current 3GPP standard cannot better support the inactive downlink small data transmission process, and there are the following problems:
  • the source base station cannot send MT-SDT related information to the target base station through the XnAP message:
  • the current protocol does not support the source base station to send MT-SDT related information, including the data volume information of MT-SDT data and/or signaling, to the target base station through the XnAP message to assist the target base station in better determining whether to initiate the MT-SDT process;
  • the target base station separation architecture CU and DU cannot establish a signaling radio bearer for MT-SDT: According to the current protocol, the target base station CU cannot learn whether the MT-SDT related message transmitted by XnAP includes downlink signaling information. Therefore, it cannot instruct the target base station DU to establish a related signaling radio bearer, thereby failing to implement MT-SDT transmission; the source base station also has a similar problem;
  • the centralized physical user plane (gNB-CU-UP) of the 5G base station cannot send complete MT-SDT related information (including MT-SDT indication, MT-SDT data and/or signaling data size) to the centralized physical control plane (gNB-CU-CP) of the 5G base station, assisting CU-CP to make more reasonable judgments to better support MT-SDT transmission;
  • the embodiment of the present application provides a method for data transmission, through which the transmission of small downlink data packets in the inactive state is supported, so that the inactive terminal can receive the downlink small data packet without switching to the connected state.
  • FIG. 1 is a flow chart of a method for data transmission according to an embodiment of the present application. As shown in FIG. 1 , the method includes the following steps:
  • the first base station can obtain information such as the data type of the signaling and/or data mapped to the specific wireless bearer for small data transmission from the core network.
  • the first base station can send the received data and signaling to the inactive terminal through the inactive downlink small data transmission process according to the data and related information sent by the core network.
  • Step S104 the first base station centralized entity sends a first request message and/or a first paging message to the first base station separated entity.
  • the first request message includes at least one of the following: small data transmission signaling radio bearer configuration, small data transmission data radio bearer configuration, signaling radio bearer configuration, data radio bearer configuration; the first paging message includes an inactive downlink small data transmission indication.
  • the first indication of downlink signaling includes at least one of the following: a downlink signaling indication, a downlink signaling size indication, wherein the downlink signaling indication is used to indicate that the first base station receives downlink signaling sent by the core network, and the downlink signaling size indication is used to indicate the size of the downlink signaling sent by the core network received by the first base station.
  • the first indication of downlink user plane data includes at least one of the following: a downlink user plane data indication, a downlink user plane data size indication, wherein the downlink user plane data indication is used to indicate that the first base station receives user plane data sent by the core network, and the downlink user plane data size indication is used to indicate the size of user plane data sent by the core network to be received by the first base station.
  • the first indication of the upcoming downlink data includes at least one of the following: an indication of the upcoming downlink user plane data, an indication of the upcoming downlink signaling, wherein the indication of the upcoming downlink user plane data is used to indicate that the core network is about to send downlink user plane data to the first base station, and the indication of the upcoming downlink signaling is used to indicate that the core network is about to send downlink signaling to the first base station.
  • the first base station centralized entity sends a second message to the second base station, and the second message includes at least one of the following: a downlink small data transmission indication, a downlink small data transmission data volume size, a downlink signaling indication, a downlink signaling data volume size indication, a downlink user plane data indication, and a downlink user plane data data volume size indication, wherein the downlink small data transmission indication is used to characterize whether it is an inactive downlink small data transmission; the downlink small data transmission data volume size is used to characterize the total data volume size of all downlink user plane data and downlink signaling mapped to the inactive downlink small data dedicated bearer; the downlink signaling indication is used to characterize the total downlink small data transmission inactive state.
  • the first base station sends information related to inactive downlink small data transmission (MT-SDT) to other base stations (including the second base station) in a wireless notification area (RAN Notification area, RNA) through a radio access network (RAN) paging message of an Xn interface.
  • MT-SDT information (such as the information included in the above-mentioned second message) includes but is not limited to the following information:
  • Downlink small data transmission indication enumeration value, "yes” indicates downlink small data transmission, and "no” indicates non-downlink small data transmission.
  • Downlink small data transmission data volume an integer value ranging from 1 to 96000, indicating the total data volume of all downlink user plane data and downlink signaling mapped to the inactive small data transmission dedicated bearer.
  • Downlink signaling data size an integer value ranging from 1 to 96000, indicating the total data size of all downlink signaling mapped to the inactive small data transmission dedicated bearer.
  • Downlink user plane data indication indicates that the total data of the inactive downlink small data transmission includes the downlink user plane data.
  • Data volume of downlink user plane data an integer value ranging from 1 to 96000, indicating the data volume of all downlink user plane data mapped to the inactive small data transmission dedicated bearer.
  • Downlink small data transmission data volume integer value ranging from 1 to 96000, indicating the total data volume of all downlink user plane data and downlink signaling mapped to the inactive small data transmission dedicated bearer;
  • Downlink signaling indication indicates that the total data of the inactive downlink small data transmission contains downlink signaling
  • Downlink signaling data size integer value, ranging from 1 to 96000, indicating the total data size of all downlink signaling mapped to the inactive small data transmission dedicated bearer;
  • Downlink user plane data indication indicates that the total data of the inactive downlink small data transmission includes downlink user plane data
  • the first request message is at least one of a terminal context establishment request message and a terminal context modification request message.
  • the first request message when the first request message is a terminal context establishment request message, includes at least one of the following: a signaling radio bearer establishment list and a data radio bearer establishment list, wherein the signaling radio bearer establishment list contains one or more signaling radio bearer establishment items, and the data radio bearer establishment list contains one or more data radio bearer establishment items.
  • the data radio bearer establishment item includes at least one of a data radio bearer identifier and a radio link layer control bearer configuration for inactive small data transmission.
  • the first request message when the first request message is a terminal context modification request message, includes at least one of the following: a signaling radio bearer establishment list and a data radio bearer establishment list, wherein the signaling radio bearer establishment list contains one or more signaling radio bearer establishment items, and the data radio bearer establishment list contains one or more data radio bearer establishment items.
  • the signaling radio bearer establishment item includes at least one of a signaling radio bearer identifier, a radio link layer control bearer configuration for inactive small data transmission, and an inactive downlink small data transmission indication.
  • the value range of the signaling radio bearer identifier is a first interval
  • the first value in the first interval represents a signaling radio bearer used to transmit application layer measurement reporting information
  • the second value in the first interval represents a signaling radio bearer used to transmit experience quality information to a secondary node, wherein the first value is less than the second value.
  • the value range of the data radio bearer identifier is a second interval.
  • the second base station centralized entity sends a UE context establishment request message (that is, the above-mentioned terminal context establishment request message) to the second base station separation entity (DU).
  • the first base station centralized entity may also send a UE context establishment request message to the first base station separation entity (DU). If the downlink small data transmission data packet contains downlink data, the request message carries data radio bearer establishment list information; if the downlink small data transmission data packet contains downlink signaling, the request message carries signaling radio bearer establishment list information.
  • the UE context establishment request message includes but is not limited to the following information:
  • Signaling radio bearer establishment project including: Signaling radio bearer identifier: used to identify the signaling radio bearer (SRB); enumeration value, which can be 0 to 5 (i.e., the first interval mentioned above), 0 indicates SRB0, 2 indicates SRB2, 3 indicates SRB3...;
  • Data Radio Bearer Establishment Item Data Radio Bearer Identifier: used to identify the Data Radio Bearer (DRB); enumeration value, which can be 1 to 32 (i.e. the second interval mentioned above), and each number identifies a DRB separately;
  • the second base station centralized entity sends a UE context modification request message (i.e., the above-mentioned terminal context modification request message) to the second base station separated entity (DU).
  • a UE context modification request message i.e., the above-mentioned terminal context modification request message
  • the first base station centralized entity (CU) may also send a UE context modification request message to the first base station separated entity (DU).
  • the second base station centralized entity sends a UE context modification request message to the second base station separation entity, if downlink data is newly added to the downlink small data transmission data packet (that is, the original downlink small data packet only contains downlink signaling), the request message carries data radio bearer establishment list information.
  • the request message carries the signaling radio bearer establishment list information, and the UE context modification request
  • the message includes but is not limited to the following information:
  • Signaling Radio Bearer Identifier used to identify the signaling radio bearer SRB; enumerated value, can be 0 to 5, 0 indicates SRB0, 2 indicates SRB2, 3 indicates SRB3, 4 indicates SRB4, 5 indicates SRB5...;
  • Small data transmission indication establishment used to indicate the signaling radio bearer of small data transmission (SDT).
  • Data Radio Bearer Identifier used to identify a data radio bearer (DRB); enumerated value, which can be 1 to 32, and each number identifies a DRB separately;
  • Small data transmission indication establishment used to indicate a data radio bearer for small data transmission (SDT).
  • the wireless link layer control bearer configuration is used for data packet transmission of the signaling wireless bearer for the inactive downlink small data transmission indicated by the signaling wireless bearer identifier.
  • the wireless link layer control bearer configuration is used for the data packet transmission of the data wireless bearer for the inactive downlink small data transmission indicated by the data wireless bearer identifier.
  • the configuration is used for data packet transmission of the small data transmission signaling radio bearer (SDT SRB) indicated by the signaling radio bearer identifier (SRB ID).
  • SDT SRB small data transmission signaling radio bearer
  • the second base station separation entity receives the UE context modification request sent by the second base station concentration entity, After receiving the request message, the corresponding radio bearer is established according to the data radio bearer and signaling radio bearer indication information therein;
  • the configuration is used for data packet transmission of the small data transmission data radio bearer (SDT DRB) indicated by the data radio bearer identifier (DRB ID).
  • SDT DRB small data transmission data radio bearer
  • DRB ID data radio bearer identifier
  • the first base station centralized entity receives a terminal context establishment response message fed back by the first base station separation entity, wherein the terminal context establishment response message includes the result of the requested data radio bearer and/or signaling radio bearer.
  • the terminal context establishment response message includes at least one of a data radio bearer establishment list, a signaling radio bearer establishment list, a signaling radio bearer establishment failure list, and a data radio bearer establishment failure list.
  • the data radio bearer establishment list includes one or more data radio bearer establishment items, and the data radio bearer establishment items include data radio bearer identifiers.
  • the signaling radio bearer establishment list includes one or more signaling radio bearer establishment items, and the signaling radio bearer establishment items include signaling radio bearer identifiers.
  • the signaling radio bearer establishment failure list includes one or more signaling radio bearer establishment failure items, and at least one signaling radio bearer establishment failure item includes a signaling radio bearer identifier and a signaling radio bearer establishment failure reason, wherein the signaling radio bearer establishment failure reason includes an inability to support inactive downlink small data transmission.
  • the data radio bearer establishment failure list includes one or more data radio bearer establishment failure items, and at least one data radio bearer establishment failure item includes a data radio bearer identifier and a data radio bearer establishment failure reason, wherein the data radio bearer establishment failure reason includes an inability to support inactive downlink small data transmission.
  • a UE context establishment response message is sent to the second base station centralized entity (CU) to confirm the UE context establishment, wherein, according to the establishment of the data radio bearer and the signaling radio bearer, the UE context establishment response message includes the following content:
  • Data radio bearer identifier used to identify the data radio bearer DRB; enumeration value, can be 1 to 32, each number identifies a DRB separately.
  • Signaling Radio Bearer Identifier used to identify the signaling radio bearer SRB; enumeration value, can be 0 to 5, 0 indicates SRB0, 2 indicates SRB2, 3 indicates SRB3...
  • Signaling Radio Bearer Identifier used to identify the signaling radio bearer SRB; enumeration value, can be 0 to 5, 0 indicates SRB0, 2 indicates SRB2, 3 indicates SRB3...
  • Data radio bearer identifier used to identify the data radio bearer DRB; enumeration value, can be 1 to 32, each number identifies a DRB separately;
  • the first base station centralized entity receives a terminal context modification response message fed back by the first base station separation entity, wherein the terminal context modification response message includes the result of the requested data radio bearer and/or signaling radio bearer.
  • the terminal context modification response message includes at least one of a data radio bearer modification list, a signaling radio bearer establishment failure list, a signaling radio bearer establishment list, and a signaling radio bearer modification list.
  • the data radio bearer modification list includes one or more data radio bearer modification items, and the data radio bearer modification items include a data radio bearer identifier.
  • the signaling radio bearer establishment failure list includes one or more signaling radio bearer establishment failure items, and at least one signaling radio bearer establishment failure item includes a signaling radio bearer identifier and a signaling radio bearer establishment failure reason.
  • the signaling radio bearer establishment list includes one or more signaling radio bearer establishment items.
  • the signaling radio bearer establishment item includes a signaling radio bearer identifier.
  • the signaling radio bearer modification list includes one or more signaling radio bearer modification items, and the signaling radio bearer modification items include a signaling radio bearer identifier.
  • a UE context modification response message is sent to the second base station centralized entity (CU) to confirm the UE context modification, wherein, according to the establishment of the data radio bearer and the signaling radio bearer, the UE context modification response message includes the following content:
  • Data radio bearer identifier used to identify the data radio bearer DRB; enumeration value, can be 1 to 32, each number identifies a DRB separately.
  • Signaling Radio Bearer Identifier used to identify the signaling radio bearer SRB; enumeration value, can be 0 to 5, 0 indicates SRB0, 2 indicates SRB2, 3 indicates SRB3, 4 indicates SRB4, and 5 indicates SRB5.
  • the first paging message includes at least one of the following: an inactive downlink small data transmission indication and a data volume of the downlink small data transmission.
  • Downlink signaling indication indicates that the total data of the inactive downlink small data transmission includes downlink signaling.
  • the inactive downlink small data transmission indication is sent to the user terminal through the first base station separation entity.
  • the method also includes: the first base station centralized entity receives a user terminal context acquisition request message sent by the second base station, wherein the user terminal context acquisition request message includes at least one of the following: an inactive downlink small data transmission indication and a small data transmission indication, the inactive downlink small data transmission indication is an indication for inactive downlink small data transmission, and the small data transmission indication is an indication for inactive uplink small data transmission.
  • the second base station after receiving the request message, the second base station sends a UE context acquisition request message to the first base station, wherein it is necessary to indicate that the request is initiated by an inactive downlink small data transmission, and the message includes but is not limited to the following information (the following two options are available):
  • Inactive downlink small data transmission indication enumeration type, "true” indicates that there is downlink small data transmission, and "false” indicates that there is no downlink small data transmission.
  • the small data transmission indication is for the inactive uplink small data transmission indication, while this indication is for the inactive downlink small data transmission.
  • Small data transmission indication enumeration type, "true” indicates that there is downlink small data transmission, and "false” indicates that there is no downlink small data transmission; at this time, no small data transmission auxiliary information is included to indicate that the transmission is an inactive downlink small data transmission.
  • the method also includes: when the first base station centralized entity agrees to the user terminal context acquisition request message, the first base station centralized entity sends a user terminal context response message to the second base station, wherein the user terminal context response message includes at least one of the following: inactive downlink small data transmission user plane data information, downlink small data transmission signaling information, and other terminal context information.
  • the method further includes: when the first base station centralized entity does not agree with the user terminal context acquisition request message, the first base station centralized entity sends a partial user terminal context message to the second base station, wherein the partial user terminal context message includes at least one of the following: inactive downlink small data transmission user plane data information and inactive downlink small data transmission signaling information.
  • the second base station By sending part of the user terminal context to the second base station, it is possible to support the transmission of inactive downlink small data packets, alleviating the problem in the related technology that the first base station does not send the user terminal context to the second base station when it does not agree with the user terminal context acquisition request message, making it impossible for the second base station to transmit data packets, thereby causing a large transmission delay, and reducing the Xn interface signaling and the Xn interface transmission delay.
  • the inactive downlink small data transmission user plane data information includes at least one of the following: inactive downlink small data transmission user plane data auxiliary information and inactive downlink small data transmission user plane data volume, wherein the inactive downlink small data transmission user plane data auxiliary information includes first information indicating that there is no subsequent downlink small data transmission data and/or second information indicating that there is subsequent downlink small data transmission data, and the inactive downlink small data transmission user plane data volume includes a first data volume indicating the size of data transmitted by a single data packet and/or a second data volume indicating the size of data transmitted by each data packet in multiple data packets.
  • the inactive downlink small data transmission signaling information includes at least one of the following: inactive downlink small data transmission signaling auxiliary information and inactive downlink small data transmission signaling data volume, wherein the inactive downlink small data transmission signaling auxiliary information includes a signaling type.
  • the first base station determines whether to agree to the user terminal context acquisition request message sent by the second base station based on the downlink data and signaling related information sent by the core network.
  • a UE context response message is fed back to the second base station, which carries data and signaling related information of the inactive downlink small data transmission, including but not limited to the following information:
  • Downlink small data transmission user plane data auxiliary information enumeration type, including "single data packet” and “multiple data packets"
  • a single data packet indicates no subsequent MT-SDT data.
  • Multiple data packets indicate that there is subsequent MT-SDT data: it can indicate the number of subsequent data packets.
  • a. Single data packet indicates the amount of data transmitted by the data packet.
  • b.Multi-packet indicates the amount of data transmitted by each packet.
  • Signaling type Different signaling corresponds to different signaling radio bearers.
  • part of the UE context message is fed back to the second base station, which carries data and signaling information related to the transmission of inactive downlink small data, including but not limited to the following information:
  • Downlink small data transmission user plane data auxiliary information enumeration type, including "single data packet” and “multiple data packets"
  • a single data packet indicates no subsequent MT-SDT data.
  • Multiple data packets indicate that there is subsequent MT-SDT data: it can indicate the number of subsequent data packets.
  • a. Single data packet indicates the amount of data transmitted by the data packet.
  • b.Multi-packet indicates the amount of data transmitted by each packet.
  • Signaling type Different signaling corresponds to different signaling radio bearers.
  • the first message further includes at least one of the following: inactive downlink small data transmission user plane data information and inactive downlink small data transmission signaling information.
  • the inactive downlink small data transmission user plane data information includes at least one of the following: inactive downlink small data transmission user plane data auxiliary information and inactive downlink small data transmission user plane data volume, wherein the inactive downlink small data transmission user plane data auxiliary information includes first information indicating that there is no subsequent downlink small data transmission data and/or second information indicating that there is subsequent downlink small data transmission data, and the inactive downlink small data transmission user plane data volume includes a first data volume indicating the size of data transmitted by a single data packet and/or a second data volume indicating the size of data transmitted by each data packet in multiple data packets.
  • the inactive downlink small data transmission signaling information includes at least one of the following: The signaling auxiliary information of downlink small data transmission in the activated state and the signaling data volume of downlink small data transmission in the inactivated state, wherein the signaling auxiliary information of downlink small data transmission in the inactivated state includes the signaling type.
  • the data and information obtained by the first base station from the core network include but are not limited to the following:
  • Downlink small data transmission user plane data information including:
  • Downlink small data transmission user plane data auxiliary information enumeration type, including "single data packet” and “multiple data packets"; among them, single data packet indicates no subsequent MT-SDT data; multiple data packets indicate subsequent MT-SDT data: can indicate the number of subsequent data packets.
  • Downlink small data transmission user plane data volume indicates the amount of data transmitted by the data packet; multiple data packets: indicates the amount of data transmitted by each data packet.
  • Downlink small data transmission signaling auxiliary information includes: Signaling type: different signaling corresponds to different signaling radio bearers.
  • the first base station centralized entity includes a first base station centralized entity user plane and a first base station centralized entity control plane. After the first base station centralized entity receives the first message, the first base station centralized entity user plane sends a downlink data notification message to the first base station centralized entity control plane.
  • the downlink data notification message includes the data volume size of the inactive downlink small data transmission, wherein the data volume size of the inactive downlink small data transmission includes at least one of a downlink signaling indication and a downlink user plane data indication, the downlink signaling indication includes the data volume size of the downlink signaling, and the downlink user plane data indication includes the data volume size of the downlink user plane data.
  • the first base station centralized entity user plane (Central Unit-User Plane, CU-UP) sends the inactive downlink small data transmission related information to the first base station centralized entity control plane (Central Unit-Control Plane, CU-CP) through a downlink data notification message to assist the first base station control plane entity in determining whether to initiate an inactive downlink small data transmission process, including but not limited to the following contents:
  • Downlink small data transmission data volume integer value ranging from 1 to 96000, indicating the total data volume of all downlink user plane data and downlink signaling mapped to the inactive small data transmission dedicated bearer;
  • Downlink signaling indication indicates that the total data of the inactive downlink small data transmission contains downlink signaling
  • Downlink signaling data size integer value, ranging from 1 to 96000, indicating the total data size of all downlink signaling mapped to the inactive small data transmission dedicated bearer;
  • Downlink user plane data indication indicates that the total data of the inactive downlink small data transmission includes downlink user plane data
  • Downlink user plane data size integer value, ranging from 1 to 96000, indicating the data size of all downlink user plane data mapped to the inactive small data transmission dedicated bearer.
  • a first message sent by a core network is received by a first base station centralized entity, wherein the first message includes at least one of the following: a first indication of downlink signaling, a first indication of downlink user plane data, and a first indication of downlink data to be arrived; the first base station centralized entity sends a first request message and/or a first paging message to a first base station separation entity, wherein the first request message includes at least one of the following: small data transmission signaling radio bearer configuration, small data transmission data radio bearer configuration, signaling radio bearer configuration, data radio bearer configuration; the first paging message includes an inactive downlink small data transmission indication, so that the base station establishes a UE context according to the downlink small data related information in the first message, thereby achieving a better technical effect of supporting the transmission of inactive downlink small data packets, and thus solving the current technical problem of not supporting inactive downlink small data transmission.
  • the data transmission method provided in the embodiment of the present
  • An embodiment of the present application also provides another method for data transmission, including: a first base station separation entity receives a first request message and/or a first paging message sent by a first base station centralized entity, wherein the first request message includes at least one of the following: small data transmission signaling radio bearer configuration, small data transmission data radio bearer configuration, signaling radio bearer configuration, data radio bearer configuration; the first paging message includes an inactive downlink small data transmission indication.
  • the first request message is at least one of a terminal context establishment request message and a terminal context modification request message.
  • the first request message when the first request message is a terminal context establishment request message, includes at least one of the following: a signaling radio bearer establishment list and a data radio bearer establishment list, wherein the signaling radio bearer establishment list contains one or more signaling radio bearer establishment items, and the data radio bearer establishment list contains one or more data radio bearer establishment items.
  • the signaling radio bearer establishment item includes at least one of a signaling radio bearer identifier and a radio link layer control bearer configuration for inactive small data transmission.
  • the data radio bearer establishment item includes at least one of a data radio bearer identifier and a radio link layer control bearer configuration for inactive small data transmission.
  • the first request message when the first request message is a terminal context modification request message, the first request The request message includes at least one of the following: a signaling radio bearer establishment list and a data radio bearer establishment list, wherein the signaling radio bearer establishment list includes one or more signaling radio bearer establishment items, and the data radio bearer establishment list includes one or more data radio bearer establishment items.
  • the signaling radio bearer establishment item includes at least one of a signaling radio bearer identifier, a radio link layer control bearer configuration for inactive small data transmission, and an inactive downlink small data transmission indication.
  • the data radio bearer establishment item includes at least one of a data radio bearer identifier, a radio link layer control bearer configuration for inactive small data transmission, and an inactive downlink small data transmission indication.
  • the first base station separation entity when the first request message is a terminal context establishment request message and the first base station separation entity successfully establishes the terminal context based on the first request message, the first base station separation entity feeds back a terminal context establishment response message to the first base station centralized entity, wherein the terminal context establishment response message includes the result of the requested data radio bearer and/or signaling radio bearer.
  • the terminal context establishment response message includes at least one of a data radio bearer establishment list, a signaling radio bearer establishment list, a signaling radio bearer establishment failure list, and a data radio bearer establishment failure list.
  • the data radio bearer establishment list includes one or more data radio bearer establishment items, and the data radio bearer establishment items include a data radio bearer identifier.
  • the signaling radio bearer establishment list includes one or more signaling radio bearer establishment items, and the signaling radio bearer establishment items include a signaling radio bearer identifier.
  • the signaling radio bearer establishment failure list includes one or more signaling radio bearer establishment failure items, and at least one signaling radio bearer establishment failure item includes a signaling radio bearer identifier and a signaling radio bearer establishment failure reason, wherein the signaling radio bearer establishment failure reason includes an inability to support inactive downlink small data transmission.
  • the data radio bearer establishment failure list includes one or more data radio bearer establishment failure items, and at least one data radio bearer establishment failure item includes a data radio bearer identifier and a data radio bearer establishment failure reason, wherein the data radio bearer establishment failure reason includes an inability to support inactive downlink small data transmission.
  • the first base station separation entity when the first request message is a terminal context modification request message and the first base station separation entity successfully modifies the terminal context according to the first request message, the first base station separation entity feeds back a terminal context modification response message to the first base station centralized entity, wherein the terminal context modification response message includes the result of the requested data radio bearer and/or signaling radio bearer.
  • the terminal context modification response message includes at least one of a data radio bearer modification list, a signaling radio bearer establishment failure list, a signaling radio bearer establishment list, and a signaling radio bearer modification list.
  • the data radio bearer modification list includes one or more data radio bearer modification items, and the data radio bearer modification items include a data radio bearer identifier.
  • the signaling radio bearer establishment failure list includes one or more signaling radio bearer establishment failure items, and at least one signaling radio bearer establishment failure item includes a signaling radio bearer identifier and a signaling radio bearer establishment failure reason.
  • the signaling radio bearer establishment list includes one or more signaling radio bearer establishment items, and the signaling radio bearer establishment items include a signaling radio bearer identifier.
  • the first paging message includes at least one of the following: an inactive downlink small data transmission indication and a data volume of the downlink small data transmission.
  • An embodiment of the present application also provides another method for data transmission, including: a second base station receives a second message sent by a centralized entity of the first base station, the second message comprising at least one of the following: a downlink small data transmission indication, a downlink small data transmission data volume, a downlink signaling indication, a downlink signaling data volume indication, a downlink user plane data indication, and a downlink user plane data data volume indication, wherein the downlink small data transmission indication is used to characterize whether it is an inactive downlink small data transmission; the downlink small data transmission data volume indication is used to characterize the total data volume of all downlink user plane data and downlink signaling mapped to an inactive downlink small data dedicated bearer; the downlink signaling indication is used to characterize that the total data of the inactive downlink small data transmission includes downlink signaling; the downlink signaling data volume indication is used to characterize the total data volume of all downlink signaling mapped to an inactive downlink small data transmission dedicated bearer; the downlink user plane data
  • the downlink small data transmission data size includes a downlink signaling indication
  • the second base station's centralized entity user plane (Central Unit-User Plane, CU-UP) sends the second base station's centralized entity control plane (Central Unit-Control Plane, CU-CP) information related to the inactive downlink small data transmission through a downlink data notification message to assist the second base station control plane entity in determining whether to initiate an inactive downlink small data transmission process, including but not limited to the following contents:
  • Downlink small data transmission data volume integer value ranging from 1 to 96000, indicating the total data volume of all downlink user plane data and downlink signaling mapped to the inactive small data transmission dedicated bearer;
  • Downlink signaling indication indicates that the total data of the inactive downlink small data transmission contains downlink signaling
  • Downlink user plane data indication indicates that the total data of the inactive downlink small data transmission includes downlink user plane data
  • Data volume of downlink user plane data an integer value ranging from 1 to 96000, indicating the data volume of all downlink user plane data mapped to the inactive small data transmission dedicated bearer.
  • the method further includes: the second base station receives a radio resource control recovery request message sent by the user terminal, wherein the recovery reason of the radio resource control recovery request message is an inactive downlink small data transmission indication.
  • the second base station after receiving the request message, the second base station sends a UE context acquisition request message to the first base station, wherein it is necessary to indicate that the request is initiated by an inactive downlink small data transmission, and the message includes but is not limited to the following information (the following two options are available):
  • Inactive downlink small data transmission indication enumeration type, "true” indicates that there is downlink small data transmission, and "false” indicates that there is no downlink small data transmission.
  • the small data transmission indication is for the inactive uplink small data transmission indication, while this indication is for the inactive downlink small data transmission.
  • Small data transmission indication enumeration type, "true” indicates that there is downlink small data transmission, and "false” indicates that there is no downlink small data transmission; at this time, no small data transmission auxiliary information is included to indicate that the transmission is an inactive downlink small data transmission.
  • the method also includes: when the first base station centralized entity agrees to the user terminal context acquisition request message, the second base station receives the user terminal context response message sent by the first base station centralized entity, wherein the user terminal context response message includes at least one of the following: inactive downlink small data transmission user plane data information, downlink small data transmission signaling information, and other terminal context information.
  • the method also includes: when the first base station centralized entity does not agree to the user terminal context acquisition request message, the second base station receives part of the user terminal context message sent by the first base station centralized entity, wherein the part of the user terminal context message includes at least one of the following: inactive downlink small data transmission user plane data information and inactive downlink small data transmission signaling information.
  • the inactive downlink small data transmission user plane data information includes at least one of the following: inactive downlink small data transmission user plane data auxiliary information and inactive downlink small data transmission user plane data volume, wherein the inactive downlink small data transmission user plane data auxiliary information includes first information indicating that there is no subsequent downlink small data transmission data and/or second information indicating that there is subsequent downlink small data transmission data, and the inactive downlink small data transmission user plane data volume includes a first data volume indicating the size of data transmitted by a single data packet and/or a second data volume indicating the size of data transmitted by each data packet in multiple data packets.
  • the inactive downlink small data transmission signaling information includes at least one of the following: inactive downlink small data transmission signaling auxiliary information and inactive downlink small data transmission signaling data volume, wherein the inactive downlink small data transmission signaling auxiliary information includes a signaling type.
  • the first base station determines whether to agree to the user terminal context acquisition request message sent by the second base station based on the downlink data and signaling related information sent by the core network.
  • the first base station sends a UE context response message to the second base station.
  • the second base station receives the UE context response message.
  • the following response message carries data and signaling related information of the inactive downlink small data transmission, including but not limited to the following information:
  • Downlink small data transmission user plane data auxiliary information enumeration type, including "single data packet” and “multiple data packets"
  • a single data packet indicates no subsequent MT-SDT data.
  • Multiple data packets indicate that there is subsequent MT-SDT data: it can indicate the number of subsequent data packets.
  • a. Single data packet indicates the amount of data transmitted by the data packet.
  • b.Multi-packet indicates the amount of data transmitted by each packet.
  • Signaling type Different signaling corresponds to different signaling radio bearers.
  • the first base station sends a partial UE context message to the second base station.
  • the second base station receives the partial UE context message, which carries data and signaling information related to inactive downlink small data transmission, including but not limited to the following information:
  • Downlink small data transmission user plane data auxiliary information enumeration type, including "single data packet” and “multiple data packets"
  • a single data packet indicates no subsequent MT-SDT data.
  • Multiple data packets indicate that there is subsequent MT-SDT data: it can indicate the number of subsequent data packets.
  • a. Single data packet indicates the amount of data transmitted by the data packet.
  • b.Multi-packet indicates the amount of data transmitted by each packet.
  • Signaling type Different signaling corresponds to different signaling radio bearers.
  • the second base station includes a second base station centralized entity user plane and a second base station centralized entity control After the second base station centralized entity receives the second message, the second base station centralized entity user plane sends a downlink data notification message to the second base station centralized entity control plane.
  • the downlink data notification message includes the data volume size of the inactive downlink small data transmission, wherein the data volume size of the inactive downlink small data transmission includes at least one of a downlink signaling indication and a downlink user plane data indication, the downlink signaling indication includes the data volume size of the downlink signaling, and the downlink user plane data indication includes the data volume size of the downlink user plane data.
  • the size of the downlink small data transmission data volume includes a downlink signaling indication
  • the total data of the received inactive downlink small data transmission includes signaling, and a signaling radio bearer needs to be established for it; otherwise, it means that the total data of the received inactive downlink small data transmission includes only user plane data, and only a data radio bearer needs to be established.
  • the first request message is a terminal context establishment request message and a terminal context modification request message. Request at least one of the messages.
  • Signaling radio bearer establishment project including: signaling radio bearer identifier: used to identify the signaling radio bearer SRB; enumeration value, which can be 0 to 5 (ie, the first interval above), 0 identifies SRB0, 2 indicates SRB2, 3 indicates SRB3 ...;
  • Data radio bearer establishment project Data radio bearer identifier: used to identify the data radio bearer DRB; enumeration value, which can be 1 to 32 (ie, the second interval above), each number identifies a separate DRB;
  • the corresponding radio bearer is established according to the data radio bearer and signaling radio bearer indication information therein;
  • the configuration is used for data packet transmission of the small data transmission signaling radio bearer SDT SRB indicated by the signaling radio bearer identifier SRB ID;
  • the configuration is used for data packet transmission of the small data transmission data radio bearer SDT DRB indicated by the data radio bearer identifier DRB ID.
  • a UE context establishment response message is sent to the second base station centralized entity to confirm the UE context establishment, wherein the UE context establishment response message includes the following content according to the establishment of the data radio bearer and the signaling radio bearer:
  • Data radio bearer identifier used to identify the data radio bearer DRB; enumeration value, can be 1 to 32, each number identifies a DRB separately.
  • Signaling Radio Bearer Identifier used to identify the signaling radio bearer SRB; enumeration value, can be 0 to 5, 0 indicates SRB0, 2 indicates SRB2, 3 indicates SRB3...
  • Signaling Radio Bearer Identifier used to identify the signaling radio bearer SRB; enumeration value, can be 0 to 5, 0 indicates SRB0, 2 indicates SRB2, 3 indicates SRB3...
  • Data radio bearer identifier used to identify the data radio bearer DRB; enumeration value, can be 1 to 32, each number identifies a DRB separately;
  • the first base station centralized entity (CU) may also send a UE context modification request message to the first base station separated entity (DU).
  • the second base station centralized entity sends a UE context modification request message to the second base station separation entity, if downlink data is newly added to the downlink small data transmission data packet (that is, the original downlink small data packet only contains downlink signaling), the request message carries data radio bearer establishment list information.
  • the request message carries the signaling radio bearer establishment list information, and the UE context modification request message includes but is not limited to the following information:
  • Signaling Radio Bearer Identifier used to identify the signaling radio bearer SRB; enumerated value, can be 0 to 5, 0 indicates SRB0, 2 indicates SRB2, 3 indicates SRB3, 4 indicates SRB4, 5 indicates SRB5...;
  • Small data transmission indication establishment used to indicate the signaling radio bearer of small data transmission SDT.
  • Data radio bearer identifier used to identify the data radio bearer DRB; enumeration value, can be 1 to 32, each number identifies a DRB separately;
  • Small data transmission indication establishment used to indicate the data radio bearer of small data transmission SDT.
  • the second base station separation entity (DU) After the second base station separation entity (DU) receives the UE context establishment request message sent by the second base station centralized entity (CU), if the signaling radio bearer establishment list includes a small data transmission RLC bearer configuration and the second base station separation entity (DU) supports the configuration, the configuration is used for data packet transmission of the small data transmission signaling radio bearer SDT SRB indicated by the signaling radio bearer identifier SRB ID.
  • the configuration is used for the data radio bearer identifier DRB ID indicated Small data transmission radio bearer SDT DRB data packet transmission.
  • the corresponding radio bearer is established according to the data radio bearer and signaling radio bearer indication information therein;
  • the configuration is used for data packet transmission of the small data transmission signaling radio bearer SDT SRB indicated by the signaling radio bearer identifier SRB ID;
  • the configuration is used for data packet transmission of the small data transmission data radio bearer SDT DRB indicated by the data radio bearer identifier DRB ID.
  • a UE context modification response message is sent to the second base station centralized entity (CU) to confirm the UE context modification, wherein, according to the establishment of the data radio bearer and the signaling radio bearer, the UE context modification response message includes the following content:
  • Data radio bearer identifier used to identify the data radio bearer DRB; enumeration value, can be 1 to 32, each number identifies a DRB separately.
  • Signaling Radio Bearer Identifier used to identify the signaling radio bearer SRB; enumeration value, can be 0 to 5, 0 indicates SRB0, 2 indicates SRB2, 3 indicates SRB3, 4 indicates SRB4, and 5 indicates SRB5.
  • Signaling Radio Bearer Identifier used to identify the signaling radio bearer SRB; enumeration value, can be 0 to 5, 0 indicates SRB0, 2 indicates SRB2, 3 indicates SRB3...
  • Signaling Radio Bearer Identifier used to identify the signaling radio bearer SRB; enumeration value, can be 0 to 5, 0 indicates SRB0, 2 indicates SRB2, 3 indicates SRB3...
  • the paging message carries information related to the inactive downlink small data transmission, which specifically includes but is not limited to the following information:
  • Inactive downlink small data transmission indication enumeration value, "yes” indicates downlink small data transmission, and "no” indicates non-downlink small data transmission.
  • Downlink small data transmission data volume an integer value ranging from 1 to 96000, indicating the total data volume of all downlink user plane data and downlink signaling mapped to the inactive small data transmission dedicated bearer.
  • Downlink signaling indication indicates that the total data of the inactive downlink small data transmission includes downlink signaling.
  • Downlink signaling data size integer value, ranging from 1 to 96000, indicating the total data size of all downlink signaling mapped to the inactive small data transmission dedicated bearer.
  • Downlink user plane data indication indicates that the total data of the inactive downlink small data transmission includes the downlink user plane data.
  • Downlink user plane data size integer value, ranging from 1 to 96000, indicating the data size of all downlink user plane data mapped to the inactive small data transmission dedicated bearer.
  • FIG2 is a partial flow chart a of a method for data transmission provided by an embodiment of the present application.
  • 5GC represents the core network
  • Last Serving gNB is the source base station, that is, the first base station described below
  • Receiving gNB is the receiving base station, that is, the second base station described below
  • UE is the user terminal. The specific steps are as follows:
  • Step 1 The first base station obtains downlink data and/or downlink signaling (DL data/DL NAS signaling) from the core network, and all received downlink data and/or downlink signaling are mapped to a specific radio bearer for small data transmission, and the total data volume of the downlink data and/or downlink signaling meets the Mobile Terminated Small Data Transmission (MT-SDT) condition;
  • DL data/DL NAS signaling downlink data and/or downlink signaling
  • MTSDT Mobile Terminated Small Data Transmission
  • the first base station can obtain information such as the data type of signaling and/or data mapped to a specific wireless bearer for small data transmission from the core network; the first base station can judge based on the data and related information sent by the core network that it can send the received data and signaling to the inactive terminal through the inactive downlink small data transmission process.
  • the data and information obtained by the first base station from the core network include but are not limited to the following:
  • Downlink small data transmission user plane data auxiliary information including “single data packet” and “multiple data packets” Package", in which,
  • a single data packet indicates no subsequent MT-SDT data.
  • Multiple data packets indicate that there is subsequent MT-SDT data: it can indicate the number of subsequent data packets;
  • Downlink small data transmission user plane data volume including
  • Single data packet indicates the amount of data transmitted by the data packet
  • Multi-packet indicates the amount of data transmitted by each packet
  • Downlink small data transmission signaling information including:
  • Signaling type Different signaling corresponds to different signaling radio bearers.
  • Step 2 The first base station sends the inactive downlink small data transmission (MT-SDT) related information to other base stations (including the second base station) in the wireless notification area (RAN Notification area, RNA) through the radio access network (RAN) paging message (Xn RAN Paging) of the Xn interface.
  • the MT-SDT information includes but is not limited to the following information:
  • Downlink small data transmission indication enumeration value, "yes” indicates downlink small data transmission, “no” indicates non-downlink small data transmission;
  • Downlink small data transmission data volume integer value ranging from 1 to 96000, indicating the total data volume of all downlink user plane data and downlink signaling mapped to the inactive small data transmission dedicated bearer;
  • Downlink signaling indication indicates that the total data of the inactive downlink small data transmission contains downlink signaling
  • Downlink signaling data size integer value ranging from 1 to 96000, indicating the total data size of all downlink signaling mapped to the inactive small data transmission dedicated bearer;
  • Downlink user plane data indication indicates that the total data of the inactive downlink small data transmission includes downlink user plane data
  • Downlink user plane data size integer value, ranging from 1 to 96000, indicating the data size of all downlink user plane data mapped to the inactive small data transmission dedicated bearer;
  • the size of the downlink small data transmission data volume includes a downlink signaling indication
  • the total data of the received inactive downlink small data transmission contains signaling, and a signaling wireless bearer needs to be established for it.
  • the total data of the received inactive downlink small data transmission only contains user plane data, and only a data wireless bearer needs to be established.
  • Step 3 As shown in FIG5 , after the second base station receives the Xn RAN Paging message sent by the first base station,
  • the second base station centralized entity user plane (Central Unit-User Plane, CU-UP) sends the inactive downlink small data transmission related information to the second base station centralized entity control plane (Central Unit-Control Plane, CU-CP) through a downlink data notification message (DL data notification) to assist the second base station control plane entity in determining whether to initiate an inactive downlink small data transmission process, including but not limited to the following:
  • Downlink small data transmission data volume integer value ranging from 1 to 96000, indicating the total data volume of all downlink user plane data and downlink signaling mapped to the inactive small data transmission dedicated bearer;
  • Downlink signaling indication indicates that the total data of the inactive downlink small data transmission contains downlink signaling
  • Downlink signaling data size integer value ranging from 1 to 96000, indicating the total data size of all downlink signaling mapped to the inactive small data transmission dedicated bearer;
  • Downlink user plane data indication indicates that the total data of the inactive downlink small data transmission includes downlink user plane data
  • Downlink user plane data size integer value, ranging from 1 to 96000, indicating the data size of all downlink user plane data mapped to the inactive small data transmission dedicated bearer;
  • Step 4 As shown in FIG3 , the second base station centralized entity (CU) sends a UE context setup request message (UE context setup request) to the second base station separated entity (DU). If the downlink small data transmission data packet contains downlink data, the request message carries data radio bearer establishment list information; if the downlink small data transmission data packet contains downlink signaling, the request message carries signaling radio bearer establishment list information.
  • the UE context setup request message includes but is not limited to the following information:
  • the signaling radio bearer establishment list includes: a signaling radio bearer establishment item, wherein the signaling radio bearer establishment item includes a signaling radio bearer identifier: used to identify a signaling radio bearer SRB; an enumeration value, which can be 0 to 5, where 0 indicates SRB0, 2 indicates SRB2, and 3 indicates SRB3...; the signaling radio bearer establishment list also includes an RLC bearer configuration for small data transmission;
  • the data radio bearer establishment list includes: a data radio bearer establishment item, wherein the data radio bearer establishment item includes a data radio bearer identifier: used to identify the data radio bearer DRB; an enumeration value, which can be 1 to 32, and each number identifies a DRB separately; the data radio bearer establishment list also includes an RLC bearer configuration for small data transmission.
  • Step 5 After the second base station separation entity (DU) receives the UE context establishment request message sent by the second base station centralized entity (CU), if the signaling radio bearer establishment list includes a small data transmission RLC bearer configuration, and the second base station separation entity (DU) supports the configuration, the configuration is used for data packet transmission of the small data transmission signaling radio bearer SDT SRB indicated by the signaling radio bearer identifier SRB ID;
  • the configuration is used for data packet transmission of the small data transmission data radio bearer SDT DRB indicated by the data radio bearer identifier DRB ID;
  • Step 6 As shown in FIG3 , if the second base station separation entity successfully establishes the UE context, a UE context setup response message (UE context setup response) is sent to the second base station centralized entity to confirm the UE context establishment, wherein the UE context setup response message includes the following content according to the establishment of the data radio bearer and the signaling radio bearer:
  • the signaling radio bearer establishment list includes: a signaling radio bearer establishment item, wherein the signaling radio bearer establishment item includes a signaling radio bearer identifier: used to identify a signaling radio bearer SRB; an enumeration value, which can be 0 to 5, where 0 indicates SRB0, 2 indicates SRB2, 3 indicates SRB3...;
  • a signaling radio bearer establishment failure list includes a signaling radio bearer establishment failure item, wherein the signaling radio bearer establishment failure item includes a signaling radio bearer identifier: used to identify a signaling radio bearer SRB; an enumeration value, which can be 0 to 5, where 0 indicates SRB0, 2 indicates SRB2, 3 indicates SRB3..., and the signaling radio bearer establishment failure item also includes an establishment failure reason;
  • the data radio bearer establishment failure list includes data radio bearer establishment failure items, wherein the data radio bearer establishment failure items include a data radio bearer identifier: used to identify the data radio bearer DRB; an enumeration value, which can be 1 to 32, each number identifies a DRB separately, and the data radio bearer establishment failure item also includes the establishment failure reason.
  • the data radio bearer establishment failure items include a data radio bearer identifier: used to identify the data radio bearer DRB; an enumeration value, which can be 1 to 32, each number identifies a DRB separately, and the data radio bearer establishment failure item also includes the establishment failure reason.
  • Steps 4 to 6 can be replaced by steps 4-1 to 6-1:
  • Step 4-1 As shown in FIG4 , the second base station centralized entity sends a UE context modification request message (UE context modification request) to the second base station separated entity. If downlink data is newly added to the downlink small data transmission data packet (i.e., the original downlink small data packet contains only downlink signaling), the request message carries data radio bearer establishment list information;
  • UE context modification request UE context modification request
  • the request message carries signaling radio bearer establishment list information
  • the UE context modification request message includes but is not limited to the following information:
  • the signaling radio bearer establishment list includes signaling radio bearer establishment items, wherein the signaling radio bearer establishment The items include signaling radio bearer identification: used to identify the signaling radio bearer SRB; enumeration value, which can be 0 to 5, 0 indicates SRB0, 2 indicates SRB2, 3 indicates SRB3, 4 indicates SRB4, 5 indicates SRB5..., the signaling radio bearer establishment item also includes RLC bearer configuration for small data transmission, and small data transmission indication establishment: used to indicate the signaling radio bearer for small data transmission SDT;
  • the data radio bearer establishment list includes data radio bearer establishment items, wherein the data radio bearer establishment items include a data radio bearer identifier: used to identify the data radio bearer DRB; an enumeration value, which can be 1 to 32, each number identifies a DRB separately, and the data radio bearer establishment items also include an RLC bearer configuration for small data transmission, and a small data transmission indication establishment: used to indicate a data radio bearer for small data transmission SDT.
  • the data radio bearer establishment items include a data radio bearer identifier: used to identify the data radio bearer DRB; an enumeration value, which can be 1 to 32, each number identifies a DRB separately, and the data radio bearer establishment items also include an RLC bearer configuration for small data transmission, and a small data transmission indication establishment: used to indicate a data radio bearer for small data transmission SDT.
  • Step 5-1 After receiving the UE context modification request message sent by the second base station centralized entity, the second base station separation entity establishes a corresponding radio bearer according to the data radio bearer and signaling radio bearer indication information therein.
  • the configuration is used for the data packet transmission of the small data transmission signaling radio bearer SDT SRB indicated by the signaling radio bearer identifier SRB ID.
  • the configuration is used for data packet transmission of the small data transmission data radio bearer SDT DRB indicated by the data radio bearer identifier DRB ID.
  • Step 6-1 As shown in FIG4 , if the second base station separation entity successfully modifies the UE context, a UE context modification response message (UE context modification response) is sent to the second base station centralized entity to confirm the UE context modification, wherein the UE context modification response message includes the following content according to the establishment of the data radio bearer and the signaling radio bearer:
  • a data radio bearer modification list including data radio bearer modification items, wherein the data radio bearer modification items include a data radio bearer identifier: used to identify a data radio bearer DRB; an enumeration value, which may be 1 to 32, and each number identifies a DRB separately; a signaling radio bearer establishment failure list, including a signaling radio bearer establishment failure item, wherein the signaling radio bearer establishment failure item includes a signaling radio bearer identifier: used to identify a signaling radio bearer SRB; an enumeration value, which may be 0 to 5, 0 identifies SRB0, 2 indicates SRB2, 3 indicates SRB3, 4 indicates SRB4, and 5 indicates SRB5, and a reason: indicates the reason for the establishment failure;
  • a signaling radio bearer establishment list including signaling radio bearer establishment items, wherein the signaling radio bearer establishment items include a signaling radio bearer identifier: used to identify a signaling radio bearer SRB; an enumeration value, which can be 0 to 5, where 0 indicates SRB0, 2 indicates SRB2, 3 indicates SRB3...;
  • the signaling radio bearer modification list includes signaling radio bearer modification items, wherein the signaling radio bearer modification items include a signaling radio bearer identifier: used to identify the signaling radio bearer SRB; an enumeration value, which can be 0 to 5, where 0 identifies SRB0, 2 indicates SRB2, 3 indicates SRB3...
  • Step 7 As shown in FIG5 , the second base station determines to trigger the inactive downlink small data transmission process in combination with the inactive downlink small data transmission information sent by the first base station through Xn RAN Paging. Subsequently, the second base station centralized entity control plane (CU-CP) sends a paging message (Paging) to the second base station separated entity (DU), which carries information related to inactive downlink small data transmission, including but not limited to the following information:
  • Inactive downlink small data transmission indication enumeration value, "yes” indicates downlink small data transmission, “no” indicates non-downlink small data transmission;
  • Downlink signaling indication indicates that the total data of the inactive downlink small data transmission contains downlink signaling
  • Downlink signaling data size integer value ranging from 1 to 96000, indicating the total data size of all downlink signaling mapped to the inactive small data transmission dedicated bearer;
  • Downlink user plane data indication indicates that the total data of the inactive downlink small data transmission includes downlink user plane data
  • the data volume of downlink user plane data is an integer value ranging from 1 to 96000, indicating the data volume of all downlink user plane data mapped to the inactive small data transmission dedicated bearer.
  • Step 8 When the paging message received by the second base station separation entity contains inactive downlink small data transmission information, and the second base station separation entity supports the information, the information is used to send an inactive downlink small data transmission paging message (Uu Paging) to the inactive terminal, and the paging message contains an inactive downlink small data transmission indication.
  • Uu Paging inactive downlink small data transmission paging message
  • Step 9 After receiving the paging message sent by the second base station, if the inactive terminal meets the inactive small data transmission conditions, it sends an RRC resume request message (RRC Resume Ruquest) to the second base station, in which the recovery reason carried is the inactive downlink small data transmission indication.
  • RRC Resume Ruquest RRC resume request message
  • Step 10 After receiving the request message, the second base station sends a Retrieve UE Context Request message to the first base station, in which it is necessary to indicate that the request is initiated by an inactive downlink small data transmission.
  • the message includes but is not limited to the following information (there are two options to choose from):
  • a single data packet indicates no subsequent MT-SDT data.
  • Multiple data packets indicate that there is subsequent MT-SDT data: it can indicate the number of subsequent data packets
  • Single data packet indicates the amount of data transmitted by the data packet
  • part of the UE context message is fed back to the second base station, which carries data and signaling information related to the transmission of inactive downlink small data, including but not limited to the following information:
  • Downlink small data transmission user plane data auxiliary information enumeration type, including "single data packet” and “multiple data packets"
  • a single data packet indicates no subsequent MT-SDT data.
  • Multiple data packets indicate that there is subsequent MT-SDT data: it can indicate the number of subsequent data packets
  • Single data packet indicates the amount of data transmitted by the data packet
  • Multi-packet indicates the amount of data transmitted by each packet
  • An embodiment of the present application also provides a data transmission device, including: a first receiving module, used to receive a first message sent by a core network, wherein the first message includes at least one of the following: a first indication of downlink signaling, a first indication of downlink user plane data, and a first indication of downlink data to be arrived; a first sending module, used to send a first request message and/or a first paging message to a first base station separation entity, wherein the first request message includes at least one of the following: small data transmission signaling radio bearer configuration, small data transmission data radio bearer configuration, signaling radio bearer configuration, data radio bearer configuration; the first paging message includes an inactive downlink small data transmission indication.
  • An embodiment of the present application also provides another data transmission device, including: a second receiving module, used to receive a first request message and/or a first paging message sent by a first base station centralized entity, wherein the first request message includes at least one of the following: small data transmission signaling radio bearer configuration, small data transmission data radio bearer configuration, signaling radio bearer configuration, data radio bearer configuration; the first paging message includes an inactive downlink small data transmission indication.
  • An embodiment of the present application also provides another device for data transmission, including: a third receiving module, used to receive a second message sent by a first base station centralized entity, the second message including at least one of the following: a downlink small data transmission indication, a downlink small data transmission data volume size, a downlink signaling indication, a downlink signaling data volume size indication, a downlink user plane data indication, and a downlink user plane data data volume size indication, wherein the downlink small data transmission indication is used to characterize whether it is an inactive downlink small data transmission; the downlink small data transmission data volume size is used to characterize the total data volume size of all downlink user plane data and downlink signaling mapped to an inactive downlink small data dedicated bearer; the downlink signaling indication is used to characterize that the total data of the inactive downlink small data transmission includes downlink signaling; the downlink signaling data volume size indication is used to characterize all downlink user plane data mapped to an inactive downlink small data dedicated bearer.
  • the total data volume of downlink signaling; the downlink user plane data indication is used to characterize that the total data of inactive downlink small data transmission includes downlink user plane data; the data volume indication of downlink user plane data is used to characterize the data volume of all downlink user plane data mapped to the dedicated bearer for inactive downlink small data transmission.
  • the disclosed technical content can be implemented in other ways.
  • the device embodiments described above are only schematic.
  • the division of the units can be a logical function division. There may be other division methods in actual implementation.
  • multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.
  • Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.
  • the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.
  • the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.
  • the technical solution of the present application in essence, or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application.
  • the aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, disk or optical disk and other media that can store program codes.

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Abstract

La présente demande divulgue un procédé de transmission de données et un appareil. Le procédé comprend les étapes suivantes : une première unité centrale de station de base reçoit un premier message envoyé par un réseau central, le premier message comprenant au moins l'un des éléments suivants : une première indication de signalisation à terminaison mobile, une première indication de données de plan utilisateur à terminaison mobile, et une première indication de données à terminaison mobile à venir ; et la première unité centrale de station de base envoie, à une première unité distribuée de station de base, un premier message de demande et/ou un premier message de radiomessagerie, le premier message de demande comprenant au moins l'un des éléments suivants : une configuration de porteuse radio de signalisation de transmission de petites données, une configuration de porteuse radio de données de transmission de petites données, une configuration de porteuse radio de signalisation et une configuration de porteuse radio de données, et le premier message de radiomessagerie comprenant une indication de transmission de petites données à terminaison mobile inactive.
PCT/CN2024/097649 2023-08-18 2024-06-06 Procédé de transmission de données et appareil Pending WO2025039674A1 (fr)

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VEERA PRASADA KADIRI, QUALCOMM INCORPORATED: "Signaling enhancements to enable MT-SDT for RRC_INACTIVE UEs.", 3GPP DRAFT; R3-231186; TYPE DISCUSSION; NR_MT_SDT-CORE, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG3, no. Online; 20230417 - 20230426, 7 April 2023 (2023-04-07), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052287769 *

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