CN110139386A - A kind of transmission method of uplink small data, network side DU and network side CU - Google Patents

A kind of transmission method of uplink small data, network side DU and network side CU Download PDF

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Publication number
CN110139386A
CN110139386A CN201810128135.4A CN201810128135A CN110139386A CN 110139386 A CN110139386 A CN 110139386A CN 201810128135 A CN201810128135 A CN 201810128135A CN 110139386 A CN110139386 A CN 110139386A
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China
Prior art keywords
network side
target terminal
terminal user
context
message
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Chinese (zh)
Inventor
孙建成
汪颖
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Datang Mobile Communications Equipment Co Ltd
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Telecommunications Science and Technology Research Institute Co Ltd
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Priority to CN202210621812.2A priority Critical patent/CN115002924A/en
Priority to CN201810128135.4A priority patent/CN110139386A/en
Publication of CN110139386A publication Critical patent/CN110139386A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1268—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of uplink data flows
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/12—Setup of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/22—Manipulation of transport tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
    • H04W72/1273—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows of downlink data flows
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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

Abstract

The embodiment of the present invention discloses a kind of transmission method of uplink small data, network side DU and network side CU, this method comprises: network side DU receives the upstream message and uplink small data that the target terminal user of inactive state is sent；The network side DU obtains the context of the target terminal user；The network side DU sends the uplink small data to network side CU；The network side DU sends replying message for the upstream message to the target terminal user.The embodiment of the present invention can support the uplink small data under inactive state to transmit under CU and DU separation architecture.

Description

A kind of transmission method of uplink small data, network side DU and network side CU
Technical field
The present invention relates to field of communication technology more particularly to a kind of transmission method of uplink small data, network side are distributed Unit (Distributed Unit, DU) and network side centralized unit (Centralized Unit, CU).
Background technique
5th generation (5thGeneration, 5G) communication system for user terminal state, remove connected state (connected State) and Idle state (idle state) except, newly introduce inactive state (Inactive state).User terminal can be under inactive state Carry out cell reselection, receive system information broadcast and receive paging message etc., and connected state can be quickly recovered to.In addition, There is also small data in 5G communication system, small data is the smaller data of data bulk, such as: the communication message of small data quantity Or picture of small data quantity etc..And the separation architecture of CU and DU are newly introduced in 5G communication system in network side.Exist in this way Under CU and DU separation architecture, how to support the uplink small data under inactive state to transmit is current technical problem urgently to be solved.
Summary of the invention
The embodiment of the present invention provides a kind of transmission method of uplink small data, network side DU and network side CU, to solve Under CU and DU separation architecture, the problem of how supporting uplink small data under inactive state to transmit.
The embodiment of the present invention provides a kind of transmission method of uplink small data, comprising:
Network side DU receives the upstream message and uplink small data that the target terminal user of inactive state is sent；
The network side DU obtains the context of the target terminal user；
The network side DU sends the uplink small data to network side CU；
The network side DU sends replying message for the upstream message to the target terminal user.
Optionally, if the upstream message includes control unit (the Media Access Control of media access control Control Element, MAC CE) message, the network side DU obtains the context of the target terminal user, comprising:
The network side DU obtains the Context identifier of the target terminal user from the MAC CE message；
The network side DU searches the context for obtaining the target terminal user according to the Context identifier.
Optionally, if the upstream message includes wireless heterogeneous networks, (Radio Resource Control, RRC) disappears Breath, the network side DU obtain the context of the target terminal user, comprising:
In the case where the upstream message includes the RRC information, the network side DU is sent to the network side CU For the access request of the target terminal user, wherein the access request includes the RRC information；
The network side DU receives the context establishment process for the target terminal user that the network side CU is initiated, with Establish the context of the target terminal user.
Optionally, if the upstream message includes the RRC information, the RRC information is replied message as the net Network side DU receives replying message for the network side CU transmission；Or
If the upstream message includes the MAC CE message, the MAC CE message is replied message as the network What side DU was generated.
Optionally, the control plane of the network side CU (Control Plane, CP) and user face (User Plane, UP in the case where) separating, the network side DU sends the uplink small data to the network side CU, comprising:
The network side DU sends the uplink small data to the UP of the network side CU.
Optionally, if the target terminal user establishes connection with the network side DU before entering inactive state, Then the network side DU retains the context of the target terminal user after the target terminal user accesses inactive state.
Optionally, the method also includes:
In the case where the network side DU fails to obtain the context of the target terminal user, the network side DU to Network side CU sends the access request for being directed to the target terminal user；
The network side DU receives the context establishment process for the target terminal user that the network side CU is initiated, with Establish the context of the target terminal user.
The embodiment of the present invention also provides a kind of transmission method of uplink small data, comprising:
Network side CU receives the uplink small data for the target terminal user for inactive state that network side DU is sent.
Optionally, the method also includes:
The network side CU receives the access request for the target terminal user that the network side DU is sent, wherein institute State the RRC information that access request includes the target terminal user；
The network side CU obtains the Context identifier of the target terminal user from the RRC information；
The network side CU obtains the context of the target terminal user according to the Context identifier；
The network side CU initiates the context establishment process of the target terminal user to the network side DU.
Optionally, the network side CU obtains the context of the target terminal user according to the Context identifier, packet It includes:
The network side CU obtains the pre-stored target user of the network side CU according to the Context identifier The context of terminal；Or
In the case where the context of the not stored target terminal user of the network side CU, the network side CU according to The Context identifier, the target BS connected from the target terminal user obtain the upper and lower of the target terminal user Text.
Optionally, in the case where the CP and UP of the network side CU separation, the network side CU receives network side DU hair The uplink small data for the target terminal user for inactive state sent, comprising:
The UP of the network side CU receives the upper of the target terminal user for inactive state that the network side DU is sent Row small data.
Optionally, the method also includes:
The network side CU receives the access request for the target terminal user that the network side DU is sent；
The network side CU initiates the context establishment process of the target terminal user to the network side DU.
The embodiment of the present invention also provides a kind of network side DU, comprising:
Receiving module, the upstream message and uplink small data that the target terminal user for receiving inactive state is sent；
Module is obtained, for obtaining the context of the target terminal user；
First sending module, for sending the uplink small data to network side CU；
Second sending module, for sending replying message for the upstream message to the target terminal user.
The embodiment of the present invention also provides a kind of network side CU, comprising:
Receiving module, the uplink decimal of the target terminal user for inactive state for receiving network side DU transmission According to.
The embodiment of the present invention also provides a kind of network side DU, comprising: transceiver, memory, processor and is stored in described On memory and the computer program that can run on the processor, which is characterized in that
The transceiver, the upstream message and uplink small data that the target terminal user for receiving inactive state is sent；
The processor, for obtaining the context of the target terminal user；
The transceiver, for sending the uplink small data to network side CU；
The transceiver, for sending replying message for the upstream message to the target terminal user.
Optionally, if the upstream message includes MAC CE message, the context for obtaining the target terminal user, Include:
The Context identifier of the target terminal user is obtained from the MAC CE message；
The context for obtaining the target terminal user is searched according to the Context identifier.
Optionally, if the upstream message includes RRC information, the context for obtaining the target terminal user, packet It includes:
In the case where the upstream message includes the RRC information, Xiang Suoshu network side CU, which is sent, is directed to the target The access request of user terminal, wherein the access request includes the RRC information；
Receive the context establishment process for the target terminal user that the network side CU is initiated, to establish the target The context of user terminal.
Optionally, if the upstream message includes the RRC information, the RRC information is replied message as the net Network side DU receives replying message for the network side CU transmission；Or
If the upstream message includes the MAC CE message, the MAC CE message is replied message as the network What side DU was generated.
Optionally, described to send the uplink to network side CU in the case where the CP and UP of the network side CU separation Small data, comprising:
The uplink small data is sent to the UP of the network side CU.
Optionally, if the target terminal user establishes connection with the network side DU before entering inactive state, Then the network side DU retains the context of the target terminal user after the target terminal user accesses inactive state.
Optionally, the transceiver, is also used to:
In the case where the network side DU fails to obtain the context of the target terminal user, Xiang Suoshu network side CU Send the access request for being directed to the target terminal user；
Receive the context establishment process for the target terminal user that the network side CU is initiated, to establish the target The context of user terminal.
The embodiment of the present invention also provides a kind of network side CU, comprising: transceiver, memory, processor and is stored in described On memory and the computer program that can run on the processor, which is characterized in that
The transceiver, the uplink decimal of the target terminal user for inactive state for receiving network side DU transmission According to.
Optionally, the transceiver, is also used to: receiving the access for the target terminal user that the network side DU is sent Request, wherein the access request includes the RRC information of the target terminal user；
The processor is also used to obtain the Context identifier of the target terminal user from the RRC information；
The processor is also used to obtain the context of the target terminal user according to the Context identifier；
The transceiver is also used to initiate the context establishment process of the target terminal user to the network side DU.
Optionally, described according to the Context identifier, obtain the context of the target terminal user, comprising:
According to the Context identifier, the upper and lower of the pre-stored target terminal user of the network side CU is obtained Text；Or
In the case where the context of the not stored target terminal user of the network side CU, according to the context mark Know, the target BS connected from the target terminal user obtains the context of the target terminal user.
Optionally, described to receive being directed to for network side DU transmission in the case where the CP and UP of the network side CU separation The uplink small data of the target terminal user of inactive state, comprising:
The UP of the network side CU receives the upper of the target terminal user for inactive state that the network side DU is sent Row small data.
Optionally, the transceiver is also used to:
Receive the access request for the target terminal user that the network side DU is sent；
The context establishment process of the target terminal user is initiated to the network side DU.
The embodiment of the present invention also provides a kind of computer readable storage medium, is stored thereon with computer program, the program The step in the transmission method of the uplink small data of network side DU provided in an embodiment of the present invention is realized when being executed by processor, or Person's program is realized when being executed by processor in the transmission method of the uplink small data of network side CU provided in an embodiment of the present invention The step of.
In this way, network side DU receives the upstream message that the target terminal user of inactive state is sent in the embodiment of the present invention And uplink small data；The network side DU obtains the context of the target terminal user；The network side DU is to network side CU Send the uplink small data；The network side DU sends replying message for the upstream message to the target terminal user. The embodiment of the present invention can support the uplink small data under inactive state to transmit, and can be improved under CU and DU separation architecture The efficiency of transmission of user terminal.
Detailed description of the invention
Fig. 1 is the applicable schematic network structure of the embodiment of the present invention；
Fig. 2 is the schematic network structure of the applicable CU-DU separation architecture of the embodiment of the present invention；
Fig. 3 is a kind of schematic diagram of the separation architecture of CU provided in an embodiment of the present invention；
Fig. 4 is a kind of flow chart of the transmission method of uplink small data provided in an embodiment of the present invention；
Fig. 5 is the flow chart of the transmission method of another uplink small data provided in an embodiment of the present invention；
Fig. 6 is a kind of transmission schematic diagram of uplink small data provided in an embodiment of the present invention；
Fig. 7 is the transmission schematic diagram of another uplink small data provided in an embodiment of the present invention；
Fig. 8 is the structure chart of network side DU provided in an embodiment of the present invention a kind of；
Fig. 9 is the structure chart of another network side DU provided in an embodiment of the present invention；
Figure 10 is the structure chart of another network side DU provided in an embodiment of the present invention；
Figure 11 is the structure chart of another network side DU provided in an embodiment of the present invention；
Figure 12 is the structure chart of network side CU provided in an embodiment of the present invention a kind of；
Figure 13 is the structure chart of another network side CU provided in an embodiment of the present invention；
Figure 14 is the structure chart of another network side CU provided in an embodiment of the present invention；
Figure 15 is the structure chart of another network side DU provided in an embodiment of the present invention；
Figure 16 is the structure chart of another network side CU provided in an embodiment of the present invention.
Specific embodiment
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool Body embodiment is described in detail.
To keep the technical problem to be solved in the present invention, technical solution and advantage clearer, below in conjunction with attached drawing and tool Body embodiment is described in detail.
Referring to Figure 1, Fig. 1 is the applicable schematic network structure of the embodiment of the present invention, as shown in Figure 1, including user Terminal (User Equipment, UE) 11, network side DU12 and network side CU13, wherein user terminal 11 can be mobile phone, put down Plate computer (Tablet Personal Computer), laptop computer (Laptop Computer), personal digital assistant (personal digital assistant, PDA), mobile Internet access device (Mobile Internet Device, MID) can The terminal side equipments such as wearable device (Wearable Device), it should be noted that do not limit in embodiments of the present invention The concrete type of user terminal 11.Network side DU12 and network side CU13 can be base station, such as: macro station, LTE eNB, 5G NR NB etc.；Network side DU12 and network side CU13 are also possible to small station, as low power nodes (low power node, LPN), The small stations such as pico, femto or network side DU12 and network side CU13 can be needed with access point (access point, AP) It is bright, the concrete type of network side DU12 and network side CU13, and network side DU12 are not limited in embodiments of the present invention It can be deployed in the same network side equipment with network side CU13, mutually independent heterogeneous networks side apparatus can also be deployed in In.
Such as: it is respectively that gNB-DU and gNB-CU are illustrated with network side DU12 and network side CU13, such as Fig. 2 institute Show, Fig. 2 is the schematic network structure of the applicable CU-DU separation architecture of the embodiment of the present invention.5G core net (5Next Generation Core, 5GC) and Next Generation Access (Next Generation-Radio Access Network, NG- RAN the transmission of data) can be carried out by NG interface.May exist multiple base stations 5G (gNB) under NG-RAN, it can be between gNB The transmission of data is carried out by Xn-C interface.Wherein, may include gNB-CU and multiple gNB-DU in a gNB, gNB-CU with The transmission of data can be carried out between gNB-DU by F1 interface, and a gNB-CU can manage one or more gNB- DU。
Certainly, network side CU13 can be separated into CP and user face UP, can be at this time that the present invention is implemented refering to Fig. 3, Fig. 3 A kind of schematic diagram of the separation architecture for CU that example provides.As shown in figure 3, a CU-CP can manage multiple CU-UP, and CU-CP The interface carried out data transmission between CU-UP is E1 interface.CU-CP and CU-UP can be interacted with DU, CU-CP with The interface interacted between DU is F1-C, and the interface interacted between CU-UP and DU is F1-U.
Fig. 4 is referred to, Fig. 4 is a kind of flow chart of the transmission method of uplink small data provided in an embodiment of the present invention, such as Shown in Fig. 4, comprising the following steps:
401, network side DU receives the upstream message and uplink small data that the target terminal user of inactive state is sent；
402, the network side DU obtains the context of the target terminal user；
403, the network side DU sends the uplink small data to network side CU；
404, the network side DU sends replying message for the upstream message to the target terminal user.
Wherein, above-mentioned target terminal user can be any user terminal.Rather than the user terminal of activated state can be, This kind of user terminals in inactive state.Above-mentioned upstream message can be target terminal user in the random access procedure to The upstream message that network side equipment is sent, such as: the message 3 (MSG3) of random access procedure.In addition, above-mentioned upstream message can be with Certain information including target terminal user, such as: capability information, authentication information or the mark letter of target terminal user Breath etc..Above-mentioned uplink small data can be understood as the smaller data of some data bulks, such as the communication of small data quantity disappears Breath or the picture of small data quantity etc., it is preferred that can be the data that data bulk is less than specific threshold.Certainly, except this it Outer small data can also be the smaller data of some other data bulks, be not construed as limiting to this embodiment of the present invention.Target is used The upstream message and uplink small data that family terminal is sent can be upstream message and uplink small data through a piece of news together It is sent, or is also possible to send upstream message and uplink small data etc. respectively by two message, this is not limited It is fixed.
In addition, step 402, which can be, retains the feelings of the context of the user terminal of unactivated state in the network side DU Under condition, the network side DU obtains the context of the target terminal user.Network side DU is available whole to the target user After the context at end, the context of target terminal user directly can be sent to network side CU, without F1 signaling mistake Journey.Certainly, the context found if it is the Context identifier by target terminal user, then the target terminal user Context identifier can be the Context identifier that network side DU is provided with above-mentioned target terminal user in advance, can be uplink and disappears In breath include the Context identifier of above-mentioned target terminal user, or be also possible to target terminal user by other message to The Context identifier etc. that network side DU is sent, is not construed as limiting this embodiment of the present invention.
Uplink small data is sent to network side CU in network side DU, network side CU can receive network side DU transmission at this time Uplink small data can send above-mentioned uplink small data to core net later.And uplink is sent to network side CU in network side DU After small data, network side DU sends replying message for above-mentioned upstream message to target terminal user, completes uplink small data Transmission process.
It may be implemented through the above steps, it, can under inactive state before target terminal user does not enter connected state Uplink small data is sent to network side DU, so that network side DU and network side CU are established after context, it can be quickly right These uplink small datas are handled, so that the process of data transmission is simplified, without waiting until connected state target terminal user again Uplink small data improves the efficiency of data transmission.
As an alternative embodiment, the network side DU is obtained if the upstream message includes MAC CE message The context of the target terminal user, comprising:
The network side DU obtains the Context identifier of the target terminal user from the MAC CE message；
The network side DU searches the context for obtaining the target terminal user according to the Context identifier.
Wherein, can be with the Context identifier of above-mentioned target terminal user in MAC CE message, which can be with Be non-activated state Network Temporary Identifier (Inactive adio Network Temporary Identifier, I-RNTI) or Other identifier.Above-mentioned network side DU searches the context for obtaining the target terminal user according to the Context identifier, can be with It is in the case where network side DU retains the context of the user terminal of inactive state, the target user searched from network side DU is whole The context at end.Since network side DU can obtain the Context identifier of target terminal user directly from MAC CE message, from And the context for obtaining above-mentioned target terminal user can be searched according to the Context identifier, and can be according to target user's end The context at end configures respective resources.
As an alternative embodiment, if the upstream message includes RRC information, described in the network side DU acquisition The context of target terminal user, comprising:
In the case where the upstream message includes the RRC information, the network side DU is sent to the network side CU For the access request of the target terminal user, wherein the access request includes the RRC information；
The network side DU receives the context establishment process for the target terminal user that the network side CU is initiated, with Establish the context of the target terminal user.
Wherein, network side DU can send the access request for being directed to the target terminal user to network side CU, to connect By the context establishment process of the network side CU target terminal user initiated, to establish the upper and lower of the target terminal user Text.Also, in present embodiment, network side DU, which remains unchanged, can retain the context of the user terminal of unactivated state, Yi Jishang State the context of target terminal user.
If above-mentioned upstream message includes RRC information, network side DU can not unlock RRC information and obtain the upper of target terminal user It hereafter identifies, so as to include that the access request of RRC information is sent to network side CU.And network side CU is can to unlock RRC information, it is obtained with the information such as target terminal user Context identifier in this way, so that network side CU can be by this The hereafter context of identifier lookup target terminal user.Network side CU search obtain the context of target terminal user after, The connection of context can be established with network side DU.
In addition, network side CU can be searched by the Context identifier target terminal user context can there are many real Existing mode.Such as: network side CU can be previously stored with the context of above-mentioned target terminal user, so as to directly by being somebody's turn to do Context identifier finds the context of target terminal user.Or in the not stored target terminal user of the network side CU Context in the case where, network side CU can be by the Context identifier, the target that connected from the target terminal user Base station obtains the context etc. of the target terminal user.After the context that network side CU obtains target terminal user, The context of target terminal user can be sent to network side DU.Wherein, above-mentioned target BS can be target terminal user The base station that finally connected before entering inactive state, so that network side CU is from the most latter linked base station of target terminal user (such as: the last serving gNB) context of target terminal user.This provides various ways to obtain target user's end The context at end, to can be obtained by another way when certain mode can not obtain the context of target terminal user The context for obtaining user, the data transmission being convenient between target terminal user and network side equipment.
As an alternative embodiment, if the upstream message includes the RRC information, the RRC information It replies message and receives replying message for the network side CU transmission for the network side DU；Or
If the upstream message includes the MAC CE message, the MAC CE message is replied message as the network What side DU was generated.
Wherein, if above-mentioned upstream message includes RRC information, then replying message for RRC information can be generated in network side CU, It is sent to network side DU to which network side CU can reply message this, so that network side DU, which can will be replied message, is sent to mesh Mark user terminal.If above-mentioned upstream message includes MAC CE message, then network side DU can directly generate MAC CE message It replies message, target terminal user is sent to so as to will directly reply message, to improve efficiency.
In addition, above-mentioned reply message may also be referred to as above-mentioned RRC information or MAC CE message response message, target user Terminal receives reply message after, into connected state, can be attached later state data transmission.
As an alternative embodiment, in the case where the CP and UP of the network side CU separation, the network side DU sends the uplink small data to the network side CU, comprising:
The network side DU sends the uplink small data to the UP of the network side CU.
Wherein, network side DU sends uplink small data to the UP of network side CU, so that the UP of network side CU can receive net The uplink small data for the target terminal user that network side DU is sent, and then these uplink small datas can be sent to user plane function Energy (User Plane Function, UPF).
Certainly, network side DU sends uplink small data to network side CU and can be, and network side DU is successfully accessed sound receiving Ying Hou can configure corresponding Data Radio Bearer (Data Radio Bearer, DRB) and tunnel, then by the DRB and Tunnel is issued to the UP of network side CU or network side CU by uplink small data.
As an alternative embodiment, if the target terminal user enter inactive state before with the network Side DU establishes connection, then the network side DU retains the target user after the target terminal user accesses inactive state The context of terminal.
Wherein, it is above-mentioned establish connection can for target terminal user enter inactive state before in connected state and above-mentioned net DU foundation in network side has connection, or it is to be understood that connected state of the target terminal user before entering inactive state is resident At above-mentioned network side DU.In addition, in this case, above-mentioned network side CU also remains the upper and lower of above-mentioned target terminal user Text.After target terminal user accesses inactive state, network side DU can retain the context of the target terminal user, from And it can be quickly found out the context of target terminal user in the Context identifier for receiving user, without net Network side CU searches the context of target terminal user, so as to the efficiency of improve data transfer.
As an alternative embodiment, the method also includes:
In the case where the network side DU fails to obtain the context of the target terminal user, the network side DU to Network side CU sends the access request for being directed to the target terminal user；
The network side DU receives the context establishment process for the target terminal user that the network side CU is initiated, with Establish the context of the target terminal user.
Wherein, the context that network side DU fails to obtain the target terminal user can be there are many situation.Such as: it can be with It is the context that network side DU does not retain any user terminal, or is also possible to remain with some users' ends in network side DU The context at end, but the context of the target terminal user without retaining above-mentioned inactive state.Network side DU is being received in this way To above-mentioned inactive state target terminal user send uplink small data when, according to the target terminal user provide context Mark is the context that can not find the target terminal user.
Alternatively, the RRC information of target terminal user can be received with network side DU, since network side DU can not unlock RRC Message obtains the Context identifier of target terminal user, to need for RRC information to be sent to network side CU.Above-mentioned access request In, it may include the Context identifier obtained from MAC CE message or RRC information etc..To which network side CU can basis Context identifier that is directly acquiring or unlocking from RRC information searches the upper and lower of the target terminal user of above-mentioned inactive state Text, to establish the context of the target terminal user for network side DU.Then, network side DU can be by target user end The uplink small data at end is sent to network side CU.When network side DU can not parse the RRC information from target terminal user, net Network side DU can be referred to as the process that F1 is initially accessed to the process of the network side CU access initiated.
The reality it should be noted that embodiment for the plurality of optional introduced in the embodiment of the present invention can be combined with each other each other It is existing, it can also be implemented separately, this embodiment of the present invention is not construed as limiting.
In this way, network side DU receives the upstream message that the target terminal user of inactive state is sent in the embodiment of the present invention And uplink small data；The network side DU obtains the context of the target terminal user；The network side DU is to network side CU Send the uplink small data；The network side DU sends replying message for the upstream message to the target terminal user. Compared with the existing technology, the embodiment of the invention provides a kind of transmission methods of uplink small data, so as at CU and DU points From the uplink small data transmission under framework, supported under inactive state.Before target terminal user does not enter connected state, swash non- Uplink small data can be sent to network side DU under state living, so as to quickly handle these uplink small datas, To simplify the process of data transmission, without waiting until connected state target terminal user uplink small data again, data biography is improved Defeated efficiency.
Fig. 5 is referred to, Fig. 5 is a kind of flow chart of the transmission method of uplink small data provided in an embodiment of the present invention, such as Shown in Fig. 5, comprising the following steps:
501, network side CU receives the uplink small data for the target terminal user for inactive state that network side DU is sent.
Optionally, the method also includes:
The network side CU receives the access request for the target terminal user that the network side DU is sent, wherein institute State the RRC information that access request includes the target terminal user；
The network side CU obtains the Context identifier of the target terminal user from the RRC information；
The network side CU obtains the context of the target terminal user according to the Context identifier；
The network side CU initiates the context establishment process of the target terminal user to the network side DU.
Optionally, the network side CU obtains the context of the target terminal user according to the Context identifier, packet It includes:
The network side CU obtains the pre-stored target user of the network side CU according to the Context identifier The context of terminal；Or
In the case where the context of the not stored target terminal user of the network side CU, the network side CU according to The Context identifier, the target BS connected from the target terminal user obtain the upper and lower of the target terminal user Text.
Optionally, in the case where the CP and UP of the network side CU separation, the network side CU receives network side DU hair The uplink small data for the target terminal user for inactive state sent, comprising:
The UP of the network side CU receives the upper of the target terminal user for inactive state that the network side DU is sent Row small data.
Optionally, the method also includes:
The network side CU receives the access request for the target terminal user that the network side DU is sent；
The network side CU initiates the context establishment process of the target terminal user to the network side DU.
It should be noted that the present embodiment as with the embodiment of network side CU corresponding in embodiment shown in Fig. 4, Its specific embodiment may refer to the related description of embodiment shown in Fig. 4, and in order to avoid repeated explanation, the present embodiment is not It repeats again, and may also reach up identical beneficial effect.
It is illustrated below with transmission method of multiple embodiments to uplink small data provided in an embodiment of the present invention:
Embodiment 1:
Network side CU and network side DU can be respectively gNB-CU and gNB-DU.Under inactive state, gNB-DU is remained with The context of UE, then gNB-DU, can according to the UE Context identifier that UE is provided when receiving the uplink small data of UE transmission To find the context of UE.Later, gNB-CU can be directly sent it to, F1 signaling procedure is not necessarily to.
Referring to Fig. 6, Fig. 6 is a kind of transmission schematic diagram of uplink small data provided in an embodiment of the present invention.UE first to GNB-DU sends random access request, and gNB-DU replys random access response to UE.To which MAC CE message is sent to by UE GNB-DU, and uplink small data is sent to gNB-DU simultaneously.The MAC CE message and uplink small data for receiving UE it Afterwards, I-RNTI can be obtained from MAC CE message, the context of UE is found according to I-RNTI, and match according to the context of UE Set respective resources.Then, the uplink small data from UE is sent to gNB-CU on corresponding DRB by gNB-DU, at CP UP points From in the case where, uplink small data is transmitted directly to CU UP.Later, gNB-CU CU UP handles uplink small data And issue UPF.GNB-DU can reply the response message of MAC CE message to UE, UE can be moved to connection status, in turn Further receive subsequent possible downlink data.
Embodiment 2:
Referring to Fig. 7, Fig. 7 is a kind of transmission schematic diagram of uplink small data provided in an embodiment of the present invention.If according to The Context identifier that UE is provided, the context or gNB-DU solution that gNB-DU does not find the UE in the UE context of preservation are not Open RRC information, can through this embodiment in method obtain the context of the UE.UE first sends random access to gNB-DU Request, gNB-DU reply random access response to UE.To which RRC information or MAC CE message are sent to gNB-DU by UE, and Uplink small data is sent to gNB-DU simultaneously.In the RRC information or MAC CE message and uplink small data for receiving UE Later, gNB-DU can initiate access procedure to gNB-CU, by the content of RRC information or MAC CE message (on especially UE Hereafter identify, such as I-RNTI) gNB-CU is issued by F1 signaling.
Wherein, above-mentioned F1 signaling is the signaling that gNB-DU and gNB-CU are sent by F1 interface.GNB-CU is according to I-RNTI The context of UE is found, and replys the access request of gNB-DU.If gNB-CU does not store the context of the UE, gNB- CU initiates context acquisition process, after gNB-CU takes UE context, meeting and gNB-DU to old serving BS according to I-RNTI Between establish UE context, then will access response notice gNB-DU.
In addition, gNB-DU is in the RRC information or MACCE message for receiving UE, Yi Jishang in the case where CP UP separation After row small data, access procedure can be initiated to CU CP；CU CP can according to UE Context identifier (such as I-RNTI) come Address UE context；UE context is established between CU CP meeting and gNB-DU, and access is then responded into notice gNB-DU.gNB-DU After receiving and being successfully accessed response, corresponding DRB and tunnel are configured, data are then issued into gNB-CU CU UP.gNB-DU The result of RRC information or MAC CE message is replied to UE.And UE can be switched to connected state or be switched to inactive state. And gNB-CU can carry out the response of upstream data or the transmission of downlink data at this time, gNB-CU can also carry out upstream data Response or downlink data transmission.
Embodiment 3:
UE is specifically introduced in the present embodiment to access network by RRC information while sending small data.
GNB-DU needs to initiate initial access process to gNB-CU, because the inextricable RRC information of gNB-DU, can not know UE Context identifier.
Step 1, gNB-DU receive the RRC information and uplink small data of some inactive state UE；
Step 2, gNB-DU pass the message to gNB-CU；
Step 3, gNB-CU unlock the RRC information, obtain the information such as UE Context identifier, gNB-CU is according to UE context mark Knowledge looks for UE context, there is following two situation at this time:
Situation 1: the gNB-CU preserves the context of the UE, then gNB-CU can be established to gNB-DU initiation context Journey can send RRC information to UE to respond the request message of UE after being successfully established (message is sent to UE by gNB-DU)；
Situation 2: the gNB-CU does not save the context of the UE, then gNB-CU can go to find according to the Context identifier of UE Old serving BS goes to obtain the context of UE, and the process after obtaining successfully is same as above.
Step 4, after UE context is successfully established on F1 interface (interface between gNB-DU and gNB-CU), gNB-DU can The uplink small data from UE is sent to gNB-CU.
In the present embodiment, because gNB-DU can not unlock RRC information, to can not know the Context identifier of UE.gNB- RRC information is sent to gNB-CU by DU, and gNB-CU can unlock RRC information, to obtain the Context identifier of UE, searches UE's Context.
Embodiment 4:
It specifically introduces UE in the present embodiment to access network by MAC CE message while sending small data, gNB-DU retains should The context of UE.
GNB-CU and gNB-DU remains with the context of the UE, and gNB-DU can be directly by the data of UE corresponding GNB-CU is sent on DRB.
Step 1, gNB-DU receive the MAC CE message and uplink small data of some inactive state UE；
Step 2, gNB-DU obtain the Context identifier of the UE from MAC CE message, for example, I-RNTI, gNB-DU according to UE Context identifier finds the context of UE；
Uplink small data from UE is sent to gNB- using the configuration in the UE context saved by step 3, gNB-DU Packet Data Convergence Protocol (Packet DataConvergence Protocol, PDCP) entity handles of CU, subsequent gNB-CU Corresponding Data Concurrent is to UPF；
Step 4, gNB-DU reply MAC CE response message to UE.
Since gNB-DU retains the context of the UE, then the context of the UE is searched without gNB-CU, it can be direct From the context for itself finding UE.
Embodiment 5:
UE accesses network by MAC CE message and sends small data simultaneously, and gNB-DU does not retain the context of the UE.
If gNB-DU do not store UE context or gNB-DU storage UE context, but gNB-DU not the UE up and down Text then needs the processes such as access and the context foundation of F1.
Step 1, gNB-DU receive the MAC CE message and uplink small data of some inactive state UE；
Step 2, gNB-DU obtain the Context identifier of the UE from MAC CE message, for example I-RNTI, gNB-DU do not have Storage UE context fails the context to above-mentioned UE according to UE Context identifier；
Step 3, gNB-DU initiate initial access process to gNB-CU, at least to include UE Context identifier in message, than Such as I-RNTI；
Step 4, gNB-CU look for UE context according to UE Context identifier, if gNB-CU does not store the upper of the UE Hereafter then the process that UE context obtains can be initiated to old serving BS according to UE Context identifier.
Step 5, after gNB-CU obtains the context of UE, gNB-CU can to gNB-DU initiate UE context establish Journey.
After UE context is successfully established in step 6, F1 interface, gNB-DU can be by the uplink small data of UE corresponding GNB-CU is issued on DRB.
After UE context is successfully established in step 7, F1 interface, gNB-CU replys the response being successfully accessed to gNB-DU.
Step 8, gNB-DU reply the response message of MAC CE message to UE.
Since gNB-DU retains the context of the UE, then need to search the context of the UE by gNB-CU.
Interaction between gNB-DU and gNB-CU specifically may refer in preceding embodiment, not repeat herein.
Fig. 8 is referred to, Fig. 8 is the structure chart of network side DU provided in an embodiment of the present invention a kind of, as shown in figure 8, network Side DU800, comprising:
Receiving module 801, the upstream message and uplink small data that the target terminal user for receiving inactive state is sent；
Module 802 is obtained, for obtaining the context of the target terminal user；
First sending module 803, for sending the uplink small data to network side CU；
Second sending module 804, for sending replying message for the upstream message to the target terminal user.
Optionally, if the upstream message includes MAC CE message, as shown in figure 9, the acquisition module 802, comprising:
Acquiring unit 8021, for obtaining the Context identifier of the target terminal user from the MAC CE message；
Searching unit 8022, for searching the context for obtaining the target terminal user according to the Context identifier.
Optionally, if the upstream message includes RRC information, as shown in Figure 10, the acquisition module 802, comprising:
Transmission unit 8023, in the case where the upstream message includes the RRC information, Xiang Suoshu network side CU Send the access request for being directed to the target terminal user, wherein the access request includes the RRC information；
Receiving unit 8024, the context for receiving the target terminal user that the network side CU is initiated were established Journey, to establish the context of the target terminal user.
Optionally, if the upstream message includes the RRC information, the RRC information is replied message as the net Network side DU receives replying message for the network side CU transmission；Or
If the upstream message includes the MAC CE message, the MAC CE message is replied message as the network What side DU was generated.
Optionally, in the case where the CP and UP of the network side CU separation, the first sending module 803 is used for described The UP of network side CU sends the uplink small data.
Optionally, if the target terminal user has foundation to connect before entering inactive state with the network side DU800 It connects, then the network side DU800 retains the upper of the target terminal user after the target terminal user accesses inactive state Hereafter.
Optionally, as shown in figure 11, the network side DU800 further include:
Third sending module 805, for failing to obtain the context of the target terminal user in the network side DU In the case of, the access request for being directed to the target terminal user is sent to network side CU；
Receiving module 806, the context for receiving the target terminal user that the network side CU is initiated were established Journey, to establish the context of the target terminal user.
It should be noted that above-mentioned network side DU800 can be embodiment of the method in the embodiment of the present invention in the present embodiment In any embodiment network side DU, any embodiment of network side DU all may be used in embodiment of the method in the embodiment of the present invention To be realized by the above-mentioned network side DU800 in the present embodiment, and reach identical beneficial effect, details are not described herein again.
2, Figure 12 is the structure chart of network side CU provided in an embodiment of the present invention a kind of, as shown in figure 12, net referring to Figure 1 Network side CU1200 includes:
First receiving module 1201, for receiving the target terminal user for inactive state of network side DU transmission Row small data.
Optionally, as shown in figure 13, the network side CU1200 further include:
Second receiving module 1202, the access for receiving the target terminal user that the network side DU is sent are asked It asks, wherein the access request includes the RRC information of the target terminal user；
First obtains module 1203, for obtaining the Context identifier of the target terminal user from the RRC information；
Second obtains module 1204, for obtaining the context of the target terminal user according to the Context identifier；
First initiation module 1205 initiates the target terminal user to the network side DU for the network side CU Context establishment process.
Optionally, first module 1203 is obtained, for the network side CU being obtained and being deposited in advance according to the Context identifier The context of the target terminal user of storage；Or the context in the not stored target terminal user of the network side CU In the case where, according to the Context identifier, the target BS connected from the target terminal user obtains the target and uses The context of family terminal.
Optionally, in the case where the CP and UP of the network side CU separation, first receiving module 1201 is used for institute The UP for stating network side CU receives the uplink small data for the target terminal user for inactive state that the network side DU is sent.
Optionally, as shown in figure 14, the network side CU1200 further include:
Third receiving module 1206, the access for the target terminal user sent for receiving the network side DU Request；
Second initiation module 1207, the context for initiating the target terminal user to the network side DU were established Journey.
It should be noted that above-mentioned network side CU1200 can be embodiment of the method in the embodiment of the present invention in the present embodiment In any embodiment network side CU, any embodiment of network side CU all may be used in embodiment of the method in the embodiment of the present invention To be realized by the above-mentioned network side CU1200 in the present embodiment, and reach identical beneficial effect, details are not described herein again.
Figure 15 is please referred to, Figure 15 is the structure chart of another network side DU provided in an embodiment of the present invention, as shown in figure 15, Network side DU includes: transceiver 1510, memory 1520, processor 1500 and is stored on the memory 1520 and can be The computer program run on the processor, in which:
The transceiver 1510, for receiving the upstream message and uplink decimal that the target terminal user of inactive state is sent According to；
The processor 1500, for obtaining the context of the target terminal user；
The transceiver 1510, for sending the uplink small data to network side CU；
The transceiver 1510, for sending replying message for the upstream message to the target terminal user.
Wherein, transceiver 1510 can be used for sending and receiving data under the control of processor 1500.
In Figure 15, bus architecture may include the bus and bridge of any number of interconnection, specifically by 1500 generation of processor The various circuits for the memory that the one or more processors and memory 1520 of table represent link together.Bus architecture may be used also To link together various other circuits of such as peripheral equipment, voltage-stablizer and management circuit or the like, these are all It is known in the art, therefore, it will not be further described herein.Bus interface provides interface.Transceiver 1510 can To be multiple element, that is, includes transmitter and receiver, the list for communicating over a transmission medium with various other devices is provided Member.
Processor 1500, which is responsible for management bus architecture and common processing, memory 1520, can store processor 1500 and exists Execute used data when operation.
It should be noted that memory 1520 does not limit only on network side DU, it can be by memory 1520 and processing The separation of device 1500 is in different geographical locations.
Optionally, if the upstream message includes MAC CE message, the context for obtaining the target terminal user, Include:
The Context identifier of the target terminal user is obtained from the MAC CE message；
The context for obtaining the target terminal user is searched according to the Context identifier.
Optionally, if the upstream message includes RRC information, the context for obtaining the target terminal user, packet It includes:
In the case where the upstream message includes the RRC information, Xiang Suoshu network side CU, which is sent, is directed to the target The access request of user terminal, wherein the access request includes the RRC information；
Receive the context establishment process for the target terminal user that the network side CU is initiated, to establish the target The context of user terminal.
Optionally, if the upstream message includes the RRC information, the RRC information is replied message as the net Network side DU receives replying message for the network side CU transmission；Or
If the upstream message includes the MAC CE message, the MAC CE message is replied message as the network What side DU was generated.
Optionally, described to send the uplink to network side CU in the case where the CP and UP of the network side CU separation Small data, comprising:
The uplink small data is sent to the UP of the network side CU.
Optionally, if the target terminal user establishes connection with the network side DU before entering inactive state, Then the network side DU retains the context of the target terminal user after the target terminal user accesses inactive state.
Optionally, the transceiver 1510 is also used to fail to obtain the target terminal user in the network side DU In the case where context, Xiang Suoshu network side CU sends the access request for being directed to the target terminal user；Receive the network The context establishment process for the target terminal user that side CU is initiated, to establish the context of the target terminal user.
It should be noted that above-mentioned network side DU can be in the embodiment of the present invention in embodiment of the method and appoint in the present embodiment The network side DU for embodiment of anticipating, any embodiment of network side DU can be by embodiment of the method in the embodiment of the present invention Above-mentioned network side DU in the present embodiment is realized, and reaches identical beneficial effect, and details are not described herein again.
Figure 16 is please referred to, Figure 16 is the structure chart of another network side CU provided in an embodiment of the present invention, as shown in figure 16, Network side CU includes: transceiver 1610, memory 1620, processor 1600 and is stored on the memory 1620 and can be The computer program run on the processor, in which:
The transceiver 1610, the uplink of the target terminal user for inactive state for receiving network side DU transmission Small data.
Wherein, transceiver 1610 can be used for sending and receiving data under the control of processor 1600.
In Figure 16, bus architecture may include the bus and bridge of any number of interconnection, specifically by 1600 generation of processor The various circuits for the memory that the one or more processors and memory 1620 of table represent link together.Bus architecture may be used also To link together various other circuits of such as peripheral equipment, voltage-stablizer and management circuit or the like, these are all It is known in the art, therefore, it will not be further described herein.Bus interface provides interface.Transceiver 1610 can To be multiple element, that is, includes transmitter and receiver, the list for communicating over a transmission medium with various other devices is provided Member.
Processor 1600, which is responsible for management bus architecture and common processing, memory 1620, can store processor 1600 and exists Execute used data when operation.
It should be noted that memory 1620 does not limit only on network side CU, it can be by memory 1620 and processing The separation of device 1600 is in different geographical locations.
Optionally, the transceiver 1610, is also used to: receiving the target terminal user that the network side DU is sent Access request, wherein the access request includes the RRC information of the target terminal user；
The processor 1600 is also used to obtain the Context identifier of the target terminal user from the RRC information；
The processor 1600, is also used to obtain the context of the target terminal user according to the Context identifier；
The transceiver 1610 is also used to establish to the context that the network side DU initiates the target terminal user Journey.
Optionally, described according to the Context identifier, obtain the context of the target terminal user, comprising:
According to the Context identifier, the upper and lower of the pre-stored target terminal user of the network side CU is obtained Text；Or
In the case where the context of the not stored target terminal user of the network side CU, according to the context mark Know, the target BS connected from the target terminal user obtains the context of the target terminal user.
Optionally, described to receive being directed to for network side DU transmission in the case where the CP and UP of the network side CU separation The uplink small data of the target terminal user of inactive state, comprising:
The UP of the network side CU receives the upper of the target terminal user for inactive state that the network side DU is sent Row small data.
Optionally, the transceiver 1610 is also used to: receiving the whole for the target user of the network side DU transmission The access request at end；The context establishment process of the target terminal user is initiated to the network side DU.
It should be noted that above-mentioned network side CU can be in the embodiment of the present invention in embodiment of the method and appoint in the present embodiment The network side CU for embodiment of anticipating, any embodiment of network side CU can be by embodiment of the method in the embodiment of the present invention Above-mentioned network side CU in the present embodiment is realized, and reaches identical beneficial effect, and details are not described herein again.
The embodiment of the present invention also provides a kind of computer readable storage medium, is stored thereon with computer program, the program The step in the transmission method of the uplink small data of network side DU provided in an embodiment of the present invention is realized when being executed by processor, or Person's program is realized when being executed by processor in the transmission method of the uplink small data of network side CU provided in an embodiment of the present invention The step of.
In several embodiments provided herein, it should be understood that disclosed method and apparatus, it can be by other Mode realize.For example, the apparatus embodiments described above are merely exemplary, for example, the division of the unit, only For a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components can combine Or it is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed phase Coupling, direct-coupling or communication connection between mutually can be through some interfaces, the INDIRECT COUPLING or communication of device or unit Connection can be electrical property, mechanical or other forms.
It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit It is that the independent physics of each unit includes, can also be integrated in one unit with two or more units.Above-mentioned integrated list Member both can take the form of hardware realization, can also realize in the form of hardware adds SFU software functional unit.
The above-mentioned integrated unit being realized in the form of SFU software functional unit can store and computer-readable deposit at one In storage media.Above-mentioned SFU software functional unit is stored in a storage medium, including some instructions are used so that a computer Equipment (can be personal computer, server or the network equipment etc.) executes receiving/transmission method described in each embodiment of the present invention Part steps.And storage medium above-mentioned includes: USB flash disk, mobile hard disk, read-only memory (Read-Only Memory, abbreviation ROM), random access memory (Random Access Memory, abbreviation RAM), magnetic or disk etc. are various can store The medium of program code.
The above is a preferred embodiment of the present invention, it is noted that for those skilled in the art For, without departing from the principles of the present invention, it can also make several improvements and retouch, these improvements and modifications It should be regarded as protection scope of the present invention.

Claims (27)

1. a kind of transmission method of uplink small data characterized by comprising
Network side distributed unit DU receives the upstream message and uplink small data that the target terminal user of inactive state is sent；
The network side DU obtains the context of the target terminal user；
The network side DU sends the uplink small data to network side centralized unit CU；
The network side DU sends replying message for the upstream message to the target terminal user.
2. the method as described in claim 1, which is characterized in that if the upstream message includes the control list of media access control First MAC CE message, the network side DU obtain the context of the target terminal user, comprising:
The network side DU obtains the Context identifier of the target terminal user from the MAC CE message；
The network side DU searches the context for obtaining the target terminal user according to the Context identifier.
3. the method as described in claim 1, which is characterized in that if the upstream message includes radio resource control RRC message, The network side DU obtains the context of the target terminal user, comprising:
In the case where the upstream message includes the RRC information, the network side DU is directed to network side CU transmission The access request of the target terminal user, wherein the access request includes the RRC information；
The network side DU receives the context establishment process for the target terminal user that the network side CU is initiated, to establish The context of the target terminal user.
4. method as claimed in claim 2 or claim 3, which is characterized in that
If the upstream message includes the RRC information, replying message for the RRC information receives institute for the network side DU State replying message for network side CU transmission；Or
If the upstream message includes the MAC CE message, the MAC CE message is replied message as the network side DU It generates.
5. method according to any one of claims 1 to 3, which is characterized in that the network side CU control plane CP and In the case that user face UP is separated, the network side DU sends the uplink small data to the network side CU, comprising:
The network side DU sends the uplink small data to the UP of the network side CU.
6. method according to any one of claims 1 to 3, which is characterized in that if the target terminal user is non-in entrance Connection is established with the network side DU before activated state, then the network side DU is accessed inactive in the target terminal user Retain the context of the target terminal user after state.
7. the method as described in claim 1, which is characterized in that the method also includes:
In the case where the network side DU fails to obtain the context of the target terminal user, the network side DU is to network Side CU sends the access request for being directed to the target terminal user；
The network side DU receives the context establishment process for the target terminal user that the network side CU is initiated, to establish The context of the target terminal user.
8. a kind of transmission method of uplink small data characterized by comprising
Network side CU receives the uplink small data for the target terminal user for inactive state that network side DU is sent.
9. method according to claim 8, which is characterized in that the method also includes:
The network side CU receives the access request for the target terminal user that the network side DU is sent, wherein described to connect Enter the RRC information that request includes the target terminal user；
The network side CU obtains the Context identifier of the target terminal user from the RRC information；
The network side CU obtains the context of the target terminal user according to the Context identifier；
The network side CU initiates the context establishment process of the target terminal user to the network side DU.
10. method as claimed in claim 9, which is characterized in that the network side CU obtains institute according to the Context identifier State the context of target terminal user, comprising:
The network side CU obtains the pre-stored target terminal user of the network side CU according to the Context identifier Context；Or
In the case where the context of the not stored target terminal user of the network side CU, the network side CU is according to Context identifier, the target BS connected from the target terminal user obtain the context of the target terminal user.
11. the method as described in any one of claim 8 to 10, which is characterized in that at CP and UP points of the network side CU From in the case where, the network side CU receives the uplink decimal for the target terminal user for inactive state that network side DU is sent According to, comprising:
The uplink that the UP of the network side CU receives the target terminal user for inactive state that the network side DU is sent is small Data.
12. method according to claim 8, which is characterized in that the method also includes:
The network side CU receives the access request for the target terminal user that the network side DU is sent；
The network side CU initiates the context establishment process of the target terminal user to the network side DU.
13. a kind of network side DU characterized by comprising
Receiving module, the upstream message and uplink small data that the target terminal user for receiving inactive state is sent；
Module is obtained, for obtaining the context of the target terminal user；
First sending module, for sending the uplink small data to network side CU；
Second sending module, for sending replying message for the upstream message to the target terminal user.
14. a kind of network side CU characterized by comprising
Receiving module, the uplink small data of the target terminal user for inactive state for receiving network side DU transmission.
15. a kind of network side DU, comprising: transceiver, memory, processor and be stored on the memory and can be at the place The computer program run on reason device, which is characterized in that
The transceiver, the upstream message and uplink small data that the target terminal user for receiving inactive state is sent；
The processor, for obtaining the context of the target terminal user；
The transceiver, for sending the uplink small data to network side CU；
The transceiver, for sending replying message for the upstream message to the target terminal user.
16. network side DU as claimed in claim 15, which is characterized in that if the upstream message includes MAC CE message, institute State the context for obtaining the target terminal user, comprising:
The Context identifier of the target terminal user is obtained from the MAC CE message；
The context for obtaining the target terminal user is searched according to the Context identifier.
17. network side DU as claimed in claim 15, which is characterized in that described to obtain if the upstream message includes RRC information Take the context of the target terminal user, comprising:
In the case where the upstream message includes the RRC information, Xiang Suoshu network side CU, which is sent, is directed to the target user The access request of terminal, wherein the access request includes the RRC information；
Receive the context establishment process for the target terminal user that the network side CU is initiated, to establish the target user The context of terminal.
18. the network side DU as described in claim 16 or 17, which is characterized in that
If the upstream message includes the RRC information, replying message for the RRC information receives institute for the network side DU State replying message for network side CU transmission；Or
If the upstream message includes the MAC CE message, the MAC CE message is replied message as the network side DU It generates.
19. the network side DU as described in any one of claim 15 to 17, which is characterized in that the network side CU CP and It is described to send the uplink small data to network side CU in the case that UP is separated, comprising:
The uplink small data is sent to the UP of the network side CU.
20. the network side DU as described in any one of claim 15 to 17, which is characterized in that if the target terminal user exists Connection is established with the network side DU before into inactive state, then the network side DU is accessed in the target terminal user Retain the context of the target terminal user after inactive state.
21. network side DU as claimed in claim 15, which is characterized in that the transceiver is also used to:
In the case where the network side DU fails to obtain the context of the target terminal user, Xiang Suoshu network side CU is sent For the access request of the target terminal user；
Receive the context establishment process for the target terminal user that the network side CU is initiated, to establish the target user The context of terminal.
22. a kind of network side CU, comprising: transceiver, memory, processor and be stored on the memory and can be at the place The computer program run on reason device, which is characterized in that
The transceiver, the uplink small data of the target terminal user for inactive state for receiving network side DU transmission.
23. network side CU as claimed in claim 22, which is characterized in that the transceiver is also used to: receiving the network side The access request for the target terminal user that DU is sent, wherein the access request includes the RRC of the target terminal user Message；
The processor is also used to obtain the Context identifier of the target terminal user from the RRC information；
The processor is also used to obtain the context of the target terminal user according to the Context identifier；
The transceiver is also used to initiate the context establishment process of the target terminal user to the network side DU.
24. network side CU as claimed in claim 23, which is characterized in that it is described according to the Context identifier, described in acquisition The context of target terminal user, comprising:
According to the Context identifier, the context of the pre-stored target terminal user of the network side CU is obtained；Or Person
In the case where the context of the not stored target terminal user of the network side CU, according to the Context identifier, The target BS connected from the target terminal user obtains the context of the target terminal user.
25. the network side CU as described in any one of claim 22 to 24, which is characterized in that the network side CU CP and In the case that UP is separated, the uplink small data for receiving the target terminal user for inactive state that network side DU is sent, Include:
The uplink that the UP of the network side CU receives the target terminal user for inactive state that the network side DU is sent is small Data.
26. network side CU as claimed in claim 22, which is characterized in that the transceiver is also used to:
Receive the access request for the target terminal user that the network side DU is sent；
The context establishment process of the target terminal user is initiated to the network side DU.
27. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is by processor The step or the program in the transmission method of the uplink small data as described in any one of claims 1 to 7 are realized when execution The step in the transmission method of the uplink small data as described in any one of claim 8 to 12 is realized when being executed by processor.
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