CN109246746A - Foundation, UE access and the switching method and device of ongoing interface - Google Patents

Foundation, UE access and the switching method and device of ongoing interface Download PDF

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Publication number
CN109246746A
CN109246746A CN201710314146.7A CN201710314146A CN109246746A CN 109246746 A CN109246746 A CN 109246746A CN 201710314146 A CN201710314146 A CN 201710314146A CN 109246746 A CN109246746 A CN 109246746A
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China
Prior art keywords
information
message
cell
channel
user plane
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CN201710314146.7A
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Chinese (zh)
Inventor
许丽香
王弘
柯小婉
汪巍崴
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Beijing Samsung Telecom R&D Center
Beijing Samsung Telecommunications Technology Research Co Ltd
Samsung Electronics Co Ltd
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Beijing Samsung Telecommunications Technology Research Co Ltd
Samsung Electronics Co Ltd
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Priority to CN201710314146.7A priority Critical patent/CN109246746A/en
Publication of CN109246746A publication Critical patent/CN109246746A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/06—Reselecting a communication resource in the serving access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/04—Interfaces between hierarchically different network devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices

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

Abstract

This application discloses a kind of method for building up of ongoing interface, comprising: CU receives the F1 that DU is sent and establishes request message；Wherein, it includes one of following information or multiple combinations in request message that the F1, which is established: DU mark, the information list of the upper serving cell of DU, the ability information of DU, DU are the downlink TEID of RRC information transmission distribution；The CU sends F1 to the DU and establishes response message；Wherein, it includes one of following information or multiple combinations in response message that the F1, which is established: CU mark, the PLMN identification list of CU support, cell configuration list, the uplink TEID that CU is RRC information transmission distribution.Using the application, the interface of DU and CU can be established automatically, reduces the configuration of operator.

Description

Foundation, UE access and the switching method and device of ongoing interface
Technical field
This application involves wireless communication techniques, the in particular to foundation of ongoing interface, UE access and switching method and device.
Background technique
Present mobile communication is increasingly intended to provide higher mobile bandwidth, less time delay, supports a large amount of terminal clothes Business, as shown in Figure 1, for next generation network or the system architecture diagram of the 5th generation (5G) network.Wherein:
User equipment (UE) 101 is the terminal device for receiving data.Next-Generation enters network (NG-RAN) 102 Radio Access Network, including for UE provide access radio network interface (gNB is connected to 5G core net 5GC for base station ENB).Access control and mobile management functional entity (AMF) 103 are responsible for the mobile context and security information of management UE.With Family plane functional entity (UPF) 104 mainly provides the function of user plane.Conversation management functional entity SMF105 is responsible for session pipe Reason.Data network (DN) 106 includes the access and third-party business of the service of such as operator, internet.
In order to support network function to virtualize, more efficient resource management and scheduling, the gNB in 5G can be further separated into Centralized unit (gNB-CU) and distribution unit (gNB-DU).Hereinafter referred to as CU and DU in the present invention.Packet Data Convergence Protocol (PDCP) and the function of wireless heterogeneous networks (RRC) is in CU.Wireless spread-spectrum technology (RLC), media access control (MAC) and physics The function of layer is in DU.It is standardized open interface F1 between CU and DU.F1 interface sub-control plane (F1-C) and user plane (F1-U).The transport network layer of F1-C is transmitted based on IP.For more reliable transmission signaling, flow control is increased on IP Transport protocol (SCTP) agreement processed.The agreement of application layer is F1AP.SCTP can provide reliable application layer messages transmission.F1-U Transport layer be user datagram protocol/the Internet protocol (UDP/IP), GPRS Tunnel Protocol user face (GTP-U) is in UDP/IP On for carrying user-plane protocol data cell (PDU).
From the introduction of the prior art as can be seen that the framework and LTE of 5G are different, in 5G before inside of base station needs support to Interface.UE access, call setup and switching etc. how is supported to discuss there is presently no specific in F1 interface.Base station be divided into DU and The time delay of ongoing interface has also been introduced while bringing many benefits, how to reduce to greatest extent for two functional entitys of CU Time delay be it is critically important, one way in which is to transmit RRC information by user plane in F1 interface.When RRC information is in F1 How interface when transmitting, supports F1 foundation, UE access, call setup and switching etc. by user plane, and there is presently no specific Discussion.
Summary of the invention
This application provides ongoing interfaces to establish, the method and device of UE access and switching, is able to solve user plane and builds Vertical problem and the problem of introduce UE access and switching after DU and CU.
To achieve the above object, the application adopts the following technical scheme that
A kind of method for building up of ongoing interface characterized by comprising
Centralized unit CU receives the ongoing interface F1 that distribution unit DU is sent and establishes request message；Wherein, the F1 is established It include one of following information or multiple combinations: the energy of DU mark, the information list of the upper serving cell of DU, DU in request message Force information, DU are the downlink tunnel Endpoint ID TEID of radio resource control RRC message transmission distribution；
The CU sends F1 to the DU and establishes response message；Wherein, it includes following letter in response message that the F1, which is established, One of breath or multiple combinations: CU mark, the public land mobile network PLMN identification list of CU support, cell configuration column Table, CU are the uplink TEID of RRC information transmission distribution.
Preferably, the information of serving cell includes clock information and following letter in the information list of serving cell on the DU One of breath or multiple combinations: cell ID, the frequency information of cell, uplink bandwidth, downstream transmission bandwidth information, object Manage cell ID, tracing area mark TAI or Tracking Area Code, broadcast PLMN identification list, transmission receiving point TRP information, Physic channel information in wave beam Beam information, the cell, transmitting channel information in the cell, logic channel in the cell Information, the cell access layer AP mark for F1 interface of DU distribution；And/or
Community configured information in the cell configuration list includes one of following information or multiple combinations: cell mark Know, the scheduling letter that the configuration information of common signal channel, the system information in the cell, the system information are sent in the cell The cell AP for F1 interface that breath, the CU are distributed is identified.
Preferably, the ability information of the DU includes the caching capabilities of DU, the capacity information of DU, the ability of antenna, power Information and/or DU ongoing interface ability；And/or
When it includes DU ability information that the F1, which is established in request message, this method comprises: the CU utilizes the DU energy Force information scheduling user's set UE.
Preferably, the DU is that the downlink TEID that RRC information transmission distributes is logical for the user plane corresponding to different stage The TEID that road is distributed；And/or
The CU is distributed by the uplink TEID of RRC information transmission distribution for the user plane channel corresponding to different stage TEID；
Wherein, the user plane channel is to distribute in F1 establishment process, is disappeared for transmitting RRC between DU and CU Breath.
Preferably, the user plane channel be it is public on DU and CU interface, for being passed between the DU and CU The RRC information of defeated all UE；Include one of following information or multiple combinations in the data packet head of relative users plane channel: UE mark, cell ID, the information of TAI, SRB, the information of logic channel；Alternatively,
The user plane channel is common under a cell, for being transmitted in one cell between DU and CU The RRC information of all UE；Include one of following information or multiple combinations: UE in the data packet head of relative users plane channel Mark, the information of SRB, the information of logic channel；Alternatively,
It is that each Signaling Radio Bearer SRB is individually distributed that the user plane channel, which is under a cell, in DU The RRC information of all UE on corresponding SRB is transmitted between CU；It is identified in the data packet head of relative users plane channel comprising UE With the information of or logic channel；Alternatively,
F1 user plane channel is to distribute under a cell for SRB0, for transmitting all UE between DU and CU RRC information on SRB0；For other SRB of each cell in addition to SRB0, for carrying the user plane of other SRB Channel is established during UE access, for RRC information of the transmission access UE on corresponding SRB between DU and CU.
Preferably, the user plane channel established in the F1 establishment process be it is public on a DU and CU interface or When being common under a cell, RRC information or be used for transmission on SRB0 which is used for transmission on all SRB RRC information.
Preferably, when the user plane channel established in the F1 establishment process is used for transmission the RRC information on SRB0, The user plane channel that RRC information is transmitted on other SRB in addition to the SRB0 is established during UE access, and phase Correspond to each UE using family plane channel；And/or
When the user plane channel established in the F1 establishment process is used for transmission the RRC information on SRB0, corresponding The information of SRB is not included in the data packet head in user plane channel；And/or
When the user plane channel established in the F1 establishment process is used for transmission the RRC information on all SRB, in phase Using the information in the data packet head of family plane channel including SRB.
Preferably, sending F1 to the DU in CU when F1 establishes response message not comprising cell configuration list and establishing and ring After answering message, this method comprises: CU, which sends cell, establishes request message to DU, and establishes in request message and carry in the cell The cell information to be configured；The CU receives the cell that the DU is sent and establishes response message.
Preferably, the user plane channel between the DU and CU is every kind of SRB under corresponding each cell or each cell Or under each cell SRB0 establish, the cell establish in request message comprising the CU be to establish cell distribute uplink The TEID or CU is that the uplink TEID or the CU for the every kind of SRB distribution that establish cell are the SRB0 that establish cell The uplink TEID of distribution, the cell establish in response message comprising DU be to establish cell distribute downlink TEID or described DU is that the downlink TEID or the DU for the every kind of SRB distribution that establish cell are the downlink that establish the SRB0 distribution of cell TEID；And/or
If the cell establish request message and/or the cell to establish response message sent by cell signaling connection , then the cell establish request message and/or the cell to establish do not include cell ID in response message.
A kind of method for building up of ongoing interface, comprising:
DU sends F1 to CU and establishes request message；Wherein, the F1 is established in request message including one in following information Kind or multiple combinations: DU mark, the information list of the upper serving cell of DU, the ability information of DU, DU are RRC information transmission distribution Downlink TEID；
The DU receives the F1 that the CU is sent and establishes response message；Wherein, the F1 establish in response message include with One of lower information or multiple combinations: CU mark, the PLMN identification list of CU support, cell configuration list, CU are RRC information Transmit the uplink TEID of distribution.
A kind of method for building up of ongoing interface, comprising:
CU sends F1 and establishes request message to DU；Wherein, the F1 is established in request message including one in following information Kind or multiple combinations: PLMN identification list that CU mark, CU are supported, the information list of the upper serving cell of DU, cell configuration list, CU is the uplink TEID of RRC information transmission distribution；
The CU receives the F1 that the DU is sent and establishes response message；Wherein, the F1 establish in response message include with One of lower information or multiple combinations: DU mark, the ability information of DU, the actual disposition information of cell, DU are RRC information biography The downlink TEID of defeated distribution.
A kind of method for building up of ongoing interface, comprising:
DU receives the F1 that CU is sent and establishes request message to DU；Wherein, it includes following letter in request message that the F1, which is established, One of breath or multiple combinations: PLMN identification list, the information list of the upper serving cell of DU, cell that CU mark, CU are supported Configured list, CU are the uplink TEID of RRC information transmission distribution；
The DU sends F1 to the CU and establishes response message；Wherein, it includes following letter in response message that the F1, which is established, One of breath or multiple combinations: DU mark, the ability information of DU, the actual disposition information of cell, DU are RRC information transmission point The downlink TEID matched.
A kind of method for building up of ongoing interface, comprising:
CU sends F1 and establishes requirement message to DU；Wherein, the F1 is established in requirement message comprising one in following information Kind or multiple combinations: the information list of CU is identified, CU is supported PLMN identification list, the upper serving cell of DU；
The CU receives the F1 that the DU is sent and establishes request message；Wherein, the F1 establish in request message include with One of lower information or multiple combinations: DU mark, the information list of the upper serving cell of DU, the ability information of DU, DU disappear for RRC The downlink TEID of breath transmission distribution；
The CU sends F1 to the DU and establishes response message；Wherein, it includes following letter in response message that the F1, which is established, One of breath or multiple combinations: PLMN identification list, cell configuration list, the CU of CU support are RRC information transmission distribution Uplink TEID.
Preferably, the F1 is established when the F1 is established in requirement message comprising the information list of serving cell on DU The information list of serving cell on the DU is not included in request message；And/or
When the F1 establishes the PLMN identification list comprising CU support in requirement message, the F1 is established in response message The PLMN identification list supported not comprising the CU.
Preferably, when the application layer message of the DU updates, this method comprises: the CU receives the DU that the DU is sent Configuration update message includes the DU application layer message updated in the DU configuration update message；And/or
When the application layer message of the CU updates, disappear this method comprises: the CU sends CU configuration and update to the DU Breath, carries the CU application layer message of update.
Preferably, if desired update system information after the CU receives the DU application layer message updated, then the CU is to institute State the scheduling information that DU sends the system information of the system information and/or update that update.
Preferably, the scheduling information of the system information of the system information and/or update of the update is carried in system information Update message or DU configuration update in response message.
Preferably, the user is flat when passing through user plane channel transfer when the system information between the CU and DU It include the scheduling information of system information in the data packet head in face channel, the data packet head is included in the expansion head of GTP-U； And/or
When the paging message between the CU and DU passes through user plane channel transfer, the number in the user plane channel According to including one of following information or multiple combinations in packet header: needing to send the cell list or tracing area mark of paging message Know the logical channel information of list, the discontinuous reception DRX of paging, priority, paging message transmission, the data packet head Included in the expansion head of GTP-U.
A kind of method for building up of ongoing interface, comprising:
DU receives the F1 that CU is sent and establishes requirement message；Wherein, the F1 is established in requirement message comprising in following information One or more combinations: CU mark, CU support PLMN identification list, the upper serving cell of DU information list；
The DU sends F1 to the CU and establishes request message；Wherein, it includes following letter in request message that the F1, which is established, One of breath or multiple combinations: DU mark, the information list of the upper serving cell of DU, the ability information of DU, DU are RRC information biography The downlink TEID of defeated distribution；
The DU receives the F1 that the CU is sent and establishes response message；Wherein, the F1 establish in response message include with One of lower information or multiple combinations: PLMN identification list, cell configuration list, the CU of CU support are RRC information transmission point The uplink TEID matched.
A kind of cut-in method of UE, comprising:
DU in base station receives the RRC connection request message that UE is sent；
The RRC connection request message is sent to institute by the user plane channel between the CU in base station by the DU State CU；
The DU receives establishing UE context and being the request message of UE configured radio bearer for the CU transmission；Wherein, It is described establish UE context and in the request message requests message of UE configured radio bearer one of comprising following information Or multiple combinations: where CU is DU UE AP ID, the UE that CU UE AP ID, the DU of the UE distribution are the UE distribution The configuration of cell ID, the RB information to be configured, the configuration information of physical channel, the configuration information of transmission channel, logic channel Information, data feedback channel information；Wherein, the data feedback channel information is the RRC on other SRB in addition to SRB0 of CU distribution The data feedback channel information of message transmission；
The DU based on the received establish UE context and be the response of UE configured radio bearer by information configuration resource, transmission Message gives the CU, and establishes message by the RRC connection that CU described in the user plane channel reception is sent, and be transmitted to institute State UE；Wherein, it is described establish UE context and be UE configured radio bearer response message include CU be UE distribution CU UE AP ID, DU are the DU UE AP ID of UE distribution and/or are the RB information of UE configuration；
The DU receives the RRC connection setup complete message that the UE is sent, will be described by the user plane channel RRC connection setup complete message is sent to the CU, and includes the UE's in the data packet head of relative users plane channel Mark.
Preferably, the DU passes through control plane channel or user plane channel reception institute when not needing to establish session Stating CU, the RRC information downlink for controlling and sending with the downlink NAS of mobile management functional entity AMF transmission message is non-to be connect according to accessing Enter a layer NAS transmission, and is transmitted to the UE；And/or
Preferably, the RRC connection setup complete message is sent to the CU in the DU when needing to establish session Afterwards, this method comprises: the DU receives the CU establishes request message according to the initial context of the AMF and send wireless Carry reconfiguration request message；It include one of following information or a variety of groups in the radio bearer reconfiguration request message Close: CU is that CU UE AP ID, the DU of UE distribution are DU UE AP ID of UE distribution, increased resource block RB information, to weigh The RB information of configuration, the RB information to be deleted；
Information distributes resource to the DU based on the received, to CU transmission radio bearer reconfiguration response message, and One of following information or multiple combinations are carried in the radio bearer reconfiguration response message: CU is the CU UE of UE distribution AP ID, DU are the configuration information of DU UE AP ID of UE distribution, RB；
The DU sets message by the RRC connection reconfiguration that CU described in the user plane channel reception is sent, and will be described RRC connection reconfiguration sets message and is transmitted to the UE, and the RRC connection reconfiguration that the DU receives the UE transmission, which is set, completes message, and The RRC connection reconfiguration is set into completion message by the user plane channel and is transmitted to the CU.
Preferably, including association identification in the radio bearer configuration request message that the CU is sent, and described in the carrying RRC connection is established in the data packet head in the user plane channel of message comprising identical with the radio bearer configuration request message Association identification；Alternatively,
After the DU configures resource, the DU receive before the RRC connection that the CU is sent establishes request message, this method Include: the DU to core net CN transmission radio bearer configuration response message, is wrapped in the radio bearer configuration response message Containing one of following information or multiple combinations: CU is the DU that CU UE AP ID, the DU of the UE distribution are the UE distribution UE AP ID, the RB information configured for the UE.
Preferably, the RRC connection request message is sent to the CU by the user plane channel in the DU When,
Number when the user plane channel is common on a DU and CU interface, in the user plane channel According in packet header include UE mark, the information of cell ID, TAI and/or SRB；And/or
When the user plane channel is when a cell is common, in the data packet head in the user plane channel Include UE mark, the information of TAI and/or SRB；And/or
Data when the user plane channel is each SRB in corresponding each cell, in the user plane channel Include UE mark and/or TAI in packet header；And/or
When being only that SRB0 establishes user plane channel in each cell in F1 establishment process, the DU for SRB0 by building The vertical user plane channel sends the RRC information received from SRB0 to the CU；The data of relative users plane channel It include UE mark and/or the information of TAI in packet header.
Preferably, when TAI where F1 establishment process DU has notified each cell of CU, the number in the user plane channel According to not including the TAI in packet header.
Preferably, described establish UE context and be the request message of UE configured radio bearer be radio bearer configuring request Message or UE context establish request message or self-defined message；And/or
It is described establish UE context and be UE configured radio bearer response message be radio bearer configuration response message or UE context establishes response message or self-defined message.
Preferably, established in message in the DU by the RRC connection of the user plane channel reception,
Number when the user plane channel is common on a DU and CU interface, in the user plane channel According in packet header include UE mark, cell ID, the information of SRB and/or logical channel information；And/or
When the user plane channel is when a cell is common, in the data packet head in the user plane channel Comprising UE mark, the information of SRB and/or logical channel information, the CU is by being respective cell foundation in F1 establishment process Channel for RRC information transmission sends the RRC connection and establishes message；And/or
When the user plane channel is each SRB or when for SRB0 in corresponding each cell, in the user plane Comprising UE mark and/or logical channel information in the data packet head in channel, the CU is by being respective cell in F1 establishment process The user plane channel for RRC information transmission established sends the RRC connection and establishes message.
Preferably, when the DU by the user plane channel to the CU send RRC connection setup complete message or When the RRC reconfigures completion message,
When the user plane channel is when a cell is public, in the data packet head of relative users plane channel also Information comprising SRB, alternatively, the CU reconfigures completion and disappear by parsing the RRC connection setup complete message or the RRC Breath, determines the information of the SRB；And/or
When the user plane channel is each SRB in corresponding each cell, the DU is according to receiving the RRC connection It establishes completion message or the RRC reconfigures the SRB for completing message, selection and the user plane channel of the SRB correspondence establishment pass The defeated RRC connection setup complete message or the RRC are reconfigured and are completed message.
Preferably, the DU includes: by controlling plane channel and receiving the RRC information downlink NAS that the CU is sent and transmit The DU receives the RRC transmission message that the CU is sent, and includes the CU UE AP that CU is UE distribution in the RRC transmission message ID, DU are that DU the UE AP ID and/or downlink NAS of UE distribution transmit message；And/or
When the DU passes through what CU described in the user plane channel reception on other SRB corresponded in addition to SRB0 was sent When RRC information downlink NAS is transmitted, the DU by GPRS Tunnel Protocol user face GTP-U receive CU transmission it is described under Row NAS transmits message.
Preferably, when the corresponding user plane channel of the RRC information on other described SRB, for send it is described under Row NAS transmits the information in the data packet head in the user plane channel of message comprising SRB；And/or
For the RRC information on other described SRB, if when the corresponding user plane channel each SRB, the CU with The downlink NAS transmission message is sent on the corresponding user plane channel SRB, the DU is transmitted according to the downlink NAS is received The SRB of message determines the operation for executing on corresponding SRB and sending the downlink NAS transmission message.
Preferably, described want increased RB information to include one of following information or multiple combinations: RB mark, the RB The configuration information of physical channel, the configuration information of transmission channel of the RB, the configuration information of the logic channel of the RB, institute State the QoS flow Flow information mapped on RB, the data feedback channel information of the RB；And/or
The RB information to be reconfigured includes one of following information or multiple combinations: the object of RB mark, the RB Manage the reconfiguration information of channel, the reconfiguration information of the transmission channel of the RB, the RB logic channel reconfiguration information, Increased QoS Flow information, the Qos flow information to be deleted on the RB, the Qos to be transmitted on the RB are wanted on the RB Flow information；And/or
The RB information to be deleted is identified comprising RB.
Preferably, when the DU sets message by the RRC connection reconfiguration that CU described in user plane channel reception is sent, Include the mark and/or logical channel information of UE in the data packet head of relative users plane channel.
Preferably, when the DU and CU is other SRB correspondence establishments of each UE in addition to SRB0 user plane channel, then The mark of the UE is not included in data packet head for carrying the user plane channel that the RRC connection reconfiguration sets message.
Preferably, when the DU sets message by the RRC connection reconfiguration that CU described in user plane channel reception is sent,
If the user plane channel is that a corresponding cell is public, include in the data packet head in the user plane channel SRB information；And/or if the user plane channel is corresponding each SRB, the CU utilizes user corresponding with corresponding SRB Plane channel sends the RRC connection reconfiguration and sets message, and the DU sets the SRB of message according to the RRC connection reconfiguration is received, The operation that the transmission RRC connection reconfiguration sets message is executed on the SRB.
A kind of cut-in method of UE, comprising:
CU in base station is connect by the RRC that DU described in the user plane channel reception between DU in base station is forwarded from UE to be asked Seek message；
The CU is the CU UE AP ID that UE is distributed on F1 interface, and establishes UE context to DU transmission and be UE The request message of configured radio bearer；Wherein, UE context is established and described in the request message of UE configured radio bearer Include one of following information or multiple combinations: CU is the DU that CU UE AP ID, the DU of the UE distribution are the UE distribution Cell ID where UE AP ID, the UE, the RB information to be configured, physical channel configuration information, transmission channel configuration Information, the configuration information of logic channel, data feedback channel information；Wherein, the data feedback channel information is CU distribution for removing The data feedback channel information that RRC information is transmitted on other SRB except SRB0；
The CU establishes UE context by the user plane channel reception and disappears for the response of UE configured radio bearer Breath sends RRC connection to the DU by the user plane channel and establishes message, and passes through the user plane channel reception The DU is forwarded from the RRC connection setup complete message of the UE, flat in the user for carrying RRC connection setup complete message It include the mark of the UE in the data packet head in face channel；The CU sends initial UE message to AMF；Wherein, described to establish UE Context and be UE configured radio bearer response message include CU be UE distribution CU UE AP ID, DU be UE distribution DU UE AP ID and/or the RB information configured for UE.
Preferably, when needing to establish session, after the CU receives the RRC connection setup complete message, this method It include: that the CU receives the initial context that the AMF is sent and establishes request message, and sends radio bearer reconfiguration to the DU Set request message；Including one of following information or multiple combinations in the radio bearer reconfiguration request message: CU is UE distribution CU UE AP ID, DU be UE distribution DU UE AP ID, want increased RB information, to be reconfigured RB information, The RB information to be deleted；
The CU receives the DU and completes the radio bearer reconfiguration response message sent after resource allocation；Wherein, described One of following information or multiple combinations are carried in radio bearer reconfiguration response message: CU is the CU UE AP of UE distribution ID, DU are the configuration information of DU UE AP ID of UE distribution, RB；
The CU sends RRC connection reconfiguration to the DU by the user plane channel and sets message, and passes through the use Family plane channel, which receives the DU and is forwarded from the RRC connection reconfiguration of the UE, to be set and completes message.
A kind of switching method of UE, for switching between the different DU of the same CU, this method comprises:
The measurement that the CU of base station is sent by source DU described in the user plane channel reception between the source DU that switches in base station Report message；The measurement report message is that UE issues the source DU；
After the CU determination switches over UE, is sent to purpose DU and establish UE context and be UE configured radio bearer Request message；Wherein, described to establish UE context and include one in following information for the request message of UE configured radio bearer Kind or multiple combinations: CU be UE distribution CU UE AP ID, UE in the contextual information of S-DU, purpose cell ID, to configure RB information, the configuration information of physical channel, the configuration information of transmission channel, the configuration information of logic channel, data feedback channel letter The instruction that breath, MBB switch；
The CU receives establishing UE context and being the response message of UE configured radio bearer for the purpose DU transmission；? It is described to establish UE context and to include one of following information or multiple combinations in the response message of UE configured radio bearer: CU is that CU UE AP ID, the purpose DU of UE distribution are DU UE AP ID of UE distribution, are the RB information of UE configuration；
The CU sends RRC connection reconfiguration by the user plane channel and sets message to the source DU, and by different DU Between the instruction of information and/or MBB that switches be sent to the source DU；
The CU sends data to the purpose DU, and after UE is synchronized to purpose cell, the CU receives the purpose DU The RRC connection setup complete message sent by user plane channel；The RRC connection setup complete message is that the UE is sent To the base station；
The CU sends UE context release message to the source DU.
Preferably, the instruction of the information switched between different DU and/or MBB are sent to the source DU by the CU includes: The CU sends the instruction of the information and/or MBB that switch between the difference DU by F1AP message, alternatively, by different DU it Between the instruction of the information that switches and/or MBB be included in the user plane channel that message is set for carrying the RRC connection reconfiguration The source DU is sent in data packet head.
Preferably, when the instruction of the information and/or MBB that switch between the difference DU is included in the number in user plane channel When according in packet header, which further includes that CU UE AP ID, S-DU that CU is UE distribution are the DU UE AP ID of UE distribution And/or send the logical channel information that the RRC connection reconfiguration sets message.
Preferably, when it is described be switched to MBB switching when, this method comprises: the CU determine stop send downlink data or Stop the time with UE communication, and notifies the source DU.
Preferably, the CU sends data to the purpose DU includes:
It is that the CU directly not confirms the UE and be sent to the purpose DU from the data that UPF is received；Or Person,
When purpose DU and source DU have identical RB configuration, the CU receives the first message that the source DU is sent；
Wherein, it is the DU UE AP of UE distribution that the first message, which includes: CU UE AP ID, source DU that CU is UE distribution, ID, RLC send state and/or PDCP transmits and receives state；Wherein, it includes that the last one is successfully transmitted that the RLC, which sends state, The SN of GTP-U data packet, the failed SN for sending GTP-U data packet and the RLC SN, the PDCP sent not successfully send shape State includes that the last one is successfully transmitted the SN of GTP-U data packet, failed transmission GTP-U data packet SN and/or uplink PDCP Reception state.
Preferably, receiving described first in the CU when not including that PDCP transmits and receives state in the first message After message, this method further include: the CU sends second message to the purpose DU；
Wherein, it is the DU UE AP of UE distribution that the second message, which includes: CU UE AP ID, source DU that CU is UE distribution, ID and/or RLC sends state.
Preferably, the first message is one message of one message of RLC context transfer or PDCP context transfer, described the Two message are two message of two message of RLC context transfer or PDCP context transfer.
A kind of switching method of UE, for switching between the different DU of the same CU, this method comprises:
The source DU that switches in base station receives the measurement report message that user terminal UE is sent, the source DU by with base station User plane channel between CU sends the measurement report message to the CU；
The source DU sets message by the RRC connection reconfiguration that CU described in the user plane channel reception is sent, and receives The instruction of the information and/or MBB that switch between different DU；
The source DU receives the UE context release message that the CU is sent.
A kind of switching method of UE, for switching between the different DU of the same CU, this method comprises:
What the CU that the purpose DU switched in base station receives base station was sent establishes UE context and is UE configured radio bearer Request message；Wherein, described to establish UE context and include one in following information for the request message of UE configured radio bearer Kind or multiple combinations: CU be UE distribution CU UE AP ID, UE in the contextual information of S-DU, purpose cell ID, to configure RB information, the configuration information of physical channel, the configuration information of transmission channel, the configuration information of logic channel, data feedback channel letter The instruction that breath, MBB switch；
The purpose DU sends the response message established UE context and be UE configured radio bearer to the CU；Described Establish UE context and be UE configured radio bearer response message in include one of following information or multiple combinations: CU is CU UE AP ID, the purpose DU of UE distribution are DU UE AP ID of UE distribution, are the RB information of UE configuration；
The purpose DU receives the data that the CU is sent, and after UE is synchronized to purpose cell, the purpose DU receives institute The RRC connection setup complete message of UE transmission is stated, and by the user plane channel between the CU to described in CU forwarding RRC connection setup complete message.
A kind of CU device established for ongoing interface, comprising: transmission unit and receiving unit；
The receiving unit, the F1 for receiving DU transmission establish request message；Wherein, the F1 is established in request message Including one of following information or multiple combinations: DU mark, the information list of the upper serving cell of DU, the ability information of DU, DU For the downlink TEID of RRC information transmission distribution；
The transmission unit establishes response message for sending F1 to the DU；Wherein, the F1 is established in response message Including one of following information or multiple combinations: PLMN identification list, cell configuration list, the CU that CU mark, CU are supported are The uplink TEID of RRC information transmission distribution.
A kind of DU device established for ongoing interface, comprising: transmission unit and receiving unit；
The transmission unit establishes request message for sending F1 to CU；Wherein, the F1, which is established in request message, includes One of following information or multiple combinations: DU mark, the information list of the upper serving cell of DU, the ability information of DU, DU RRC The downlink TEID of message transmission distribution；
The receiving unit establishes response message for receiving the F1 that the CU is sent；Wherein, the F1 establishes response and disappears Include one of following information or multiple combinations in breath: PLMN identification list that CU mark, CU are supported, cell configuration list, CU is the uplink TEID of RRC information transmission distribution.
A kind of CU device established for ongoing interface, comprising: transmission unit and receiving unit；
The transmission unit establishes request message to DU for sending F1；Wherein, the F1, which is established in request message, includes One of following information or multiple combinations: the information column of CU is identified, CU is supported PLMN identification list, the upper serving cell of DU Table, cell configuration list, CU are the uplink TEID of RRC information transmission distribution；
The receiving unit establishes response message for receiving the F1 that the DU is sent；Wherein, the F1 establishes response and disappears It include one of following information or multiple combinations: DU mark, the ability information of DU, the actual disposition information of cell, DU in breath For the downlink TEID of RRC information transmission distribution.
A kind of DU device established for ongoing interface, comprising: transmission unit and receiving unit；
The receiving unit, the F1 for receiving CU transmission establish request message to DU；Wherein, the F1 establishes request and disappears It include one of following information or multiple combinations in breath: CU mark, the PLMN identification list of CU support, the upper serving cell of DU Information list, cell configuration list, CU are the uplink TEID of RRC information transmission distribution；
The transmission unit establishes response message for sending F1 to the CU；Wherein, the F1 is established in response message Including one of following information or multiple combinations: DU mark, the ability information of DU, the actual disposition information of cell, DU RRC The downlink TEID of message transmission distribution.
A kind of CU device established for ongoing interface, comprising: transmission unit and receiving unit；
The transmission unit establishes requirement message to DU for sending F1, is also used to receive the F1 in receiving unit and build After vertical request message, F1 is sent to the DU and establishes response message；
The receiving unit establishes request message for receiving the F1 that the DU is sent；
Wherein, the F1 is established in requirement message comprising one of following information or multiple combinations: CU mark, CU are supported PLMN identification list, the upper serving cell of DU information list；
It includes one of following information or multiple combinations in request message that the F1, which is established: being serviced in DU mark, DU small The information list in area, the ability information of DU, DU are the downlink TEID of RRC information transmission distribution；
It includes one of following information or multiple combinations in response message that the F1, which is established: the PLMN identity column that CU is supported Table, cell configuration list, CU are the uplink TEID of RRC information transmission distribution.
A kind of DU device established for ongoing interface, comprising: transmission unit and receiving unit；
The receiving unit, the F1 for receiving CU transmission establish requirement message；It is also used to send in the transmission unit After the F1 establishes request message, receives the F1 that the CU is sent and establish response message；
The transmission unit establishes request message for sending F1 to the CU；
Wherein, the F1 is established in requirement message comprising one of following information or multiple combinations: CU mark, CU are supported PLMN identification list, the upper serving cell of DU information list；
It includes one of following information or multiple combinations in request message that the F1, which is established: being serviced in DU mark, DU small The information list in area, the ability information of DU, DU are the downlink TEID of RRC information transmission distribution；
It includes one of following information or multiple combinations in response message that the F1, which is established: the PLMN identity column that CU is supported Table, cell configuration list, CU are the uplink TEID of RRC information transmission distribution.
A kind of DU device for UE access, comprising: receiving unit, transmission unit and processing unit；
The receiving unit, for receiving the RRC connection request message of user terminal UE transmission；
The transmission unit, for by the user plane channel between the CU in base station by the RRC connection request Message is sent to the CU；
The processing unit, for receive that the CU sends establish UE context and be UE configured radio bearer request Message, information configuration resource, transmission establish UE context and are the response message of UE configured radio bearer to institute based on the received CU is stated, and message is established by the RRC connection that CU described in the user plane channel reception is sent, and be transmitted to the UE；Also The RRC connection setup complete message sent for receiving the UE, is established the RRC connection by the user plane channel It completes message sending to the CU, and includes the mark of the UE in the data packet head of relative users plane channel；
Wherein, it is described establish UE context and in the request message of UE configured radio bearer comprising in following information One or more combinations: CU is DU UE AP ID, the UE that CU UE AP ID, the DU of the UE distribution are the UE distribution Place cell ID, the RB information to be configured, the configuration information of physical channel, the configuration information of transmission channel, logic channel Configuration information, data feedback channel information；The data feedback channel information is the RRC on other SRB in addition to SRB0 of CU distribution The data feedback channel information of message transmission；It is described to establish UE context and be the response message of UE configured radio bearer include CU be UE CU UE AP ID, the DU of distribution are the DU UE AP ID of UE distribution and/or are the RB information of UE configuration.
A kind of CU device for UE access, comprising: receiving unit, transmission unit and processing unit；
The receiving unit, for being forwarded from UE's by DU described in the user plane channel reception between DU in base station RRC connection request message；
The transmission unit is established on UE for distributing the CU UE AP ID on F1 interface for UE, and to DU transmission It hereafter and is the request message of UE configured radio bearer；Wherein, UE context is established and described for UE configured radio bearer Include one of following information or multiple combinations in request message: CU is that CU UE AP ID, the DU of the UE distribution are described Cell ID, the RB information to be configured, the configuration information of physical channel, transmission where DU UE AP ID, the UE of UE distribution The configuration information of channel, the configuration information of logic channel, data feedback channel information；Wherein, the data feedback channel information is CU distribution The data feedback channel information transmitted for the upper RRC information of other SRB in addition to SRB0；
The processing unit, for establishing UE context by the user plane channel reception and wirelessly being held for UE configuration The response message of load sends RRC connection to the DU by the user plane channel and establishes message, and flat by the user DU described in the channel reception of face is forwarded from the RRC connection setup complete message of the UE, completes to disappear for carrying RRC connection foundation It include the mark of the UE in the data packet head in the user plane channel of breath；For sending initial UE message to AMF；Wherein, institute State establish UE context and be UE configured radio bearer response message include CU be UE distribution CU UE AP ID, DU UE The DU UE AP ID of distribution and/or the RB information configured for UE.
A kind of CU device for UE switching, comprising: transmission unit, processing unit and receiving unit；
The receiving unit, for issuing the measurement of base station by the user plane channel reception UE between source DU in base station Report message；
The processing unit after switching over for determination to UE, is established UE context to purpose DU transmission and is matched for UE Set the request message of radio bearer；It is also used to receive establishing UE context and being UE configured radio bearer for the purpose DU transmission Response message；It is also used to send RRC connection reconfiguration by the user plane channel and sets message to the source DU, and will be different The instruction of the information and/or MBB that switch between DU is sent to the source DU；It is also used to send data to the purpose DU, in UE After being synchronized to purpose cell, the RRC connection setup complete message that the purpose DU is sent by user plane channel is received；Its In, the RRC connection setup complete message is that the UE is sent to the base station；
The transmission unit, for sending UE context release message to the source DU；
Wherein, described to establish UE context and include one of following information for the request message of UE configured radio bearer Or multiple combinations: CU be UE distribution CU UE AP ID, UE in the contextual information of S-DU, purpose cell ID, to be configured RB information, the configuration information of physical channel, the configuration information of transmission channel, the configuration information of logic channel, data feedback channel information, The instruction of MBB switching；It is described establish UE context and for UE configured radio bearer response message in include following information in One or more combinations: CU be UE distribution CU UE AP ID, purpose DU be UE distribution DU UE AP ID, be UE configuration RB information.
A kind of source DU device for UE switching, comprising: first processing units, the second processing unit and third processing are single Member；
The first processing units, for receive user terminal UE transmission measurement report message, be also used to by with base User plane channel between the CU to stand sends the measurement report message to the CU；
Described the second processing unit, the RRC connection reconfiguration for being sent by CU described in the user plane channel reception Message is set, and receives the instruction of the information and/or MBB that switch between different DU；
The third processing unit, the UE context release message sent for receiving the CU.
A kind of purpose DU device for UE switching, comprising: first processing units, the second processing unit and third processing are single Member；
First processing units, what the CU for receiving base station was sent establishes UE context and asking for UE configured radio bearer Seek message；Wherein, described to establish UE context and include one of following information for the request message of UE configured radio bearer Or multiple combinations: CU be UE distribution CU UE AP ID, UE in the contextual information of S-DU, purpose cell ID, to be configured RB information, the configuration information of physical channel, the configuration information of transmission channel, the configuration information of logic channel, data feedback channel information, The instruction of MBB switching；
Described the second processing unit, for sending the response established UE context and be UE configured radio bearer to the CU Message；Establish UE context and described to include one of following information in the response message of UE configured radio bearer or more Kind combination: CU is that CU UE AP ID, the purpose DU of UE distribution are DU UE AP ID of UE distribution, are the RB information of UE configuration；
The third processing unit is also used to after UE is synchronized to purpose cell for receiving the data that the CU is sent The RRC connection setup complete message that the UE is sent is received, and is turned by the user plane channel between the CU to the CU Send out RRC connection setup complete message described.
As seen from the above technical solution, the present invention provides the methods that F1 interface is established, it is possible to reduce the configuration of operator, It solves the problems, such as that RRC information is established by F1 interface user plane, guarantees better intercommunication between DU and CU.The present invention provides The communication means of F1 interface, ensure that the intercommunication that can be supported between multi-vendor equipment between DU and CU, and it is logical to solve F1 interface User plane is crossed to reduce access delay the problem of transmitting RRC information.
Detailed description of the invention
Fig. 1 is the system architecture diagram of next generation network or the 5th generation 5G network；
Fig. 2 is one schematic diagram of method for building up of ongoing interface；
Fig. 3 is two schematic diagram of method for building up of ongoing interface；
Fig. 4 is three schematic diagram of method for building up of ongoing interface；
The method schematic diagram of Fig. 5 UE access of the present invention；
The method schematic diagram that Fig. 6 UE of the present invention switches between the different DU of the same CU.
Specific embodiment
In order to which the purpose, technological means and advantage of the application is more clearly understood, the application is done below in conjunction with attached drawing It is further described.
This application provides the method for building up of three kinds of ongoing interfaces between DU and CU, meanwhile, it additionally provides and is built in ongoing interface The method of UE access and UE switching after the completion of vertical.It describes in detail below to each method in the application.
The method for building up one of ongoing interface of the present invention is as described in Figure 2.DU initiates F1 interface establishment process in this method.The party Method can be used for O&M and CU and DU has interface or only has the case where interface with DU.The method for building up of this ongoing interface includes The side DU processing and the side CU processing, here, for convenience of description for the sake of, the foundation is introduced in a manner of interacting between DU and CU Method, the method comprising the steps of:
Step 201, DU sends F1 and establishes request message to CU.
The transport Layer address of the DU CU of being connected is configured to DU by operation and maintenance system (O&M).O&M is also answering on DU With layer information configuration to DU.
Wherein, F1, which establishes request message, may include one or more combinations of following information:
- DU mark
The information list of the upper serving cell of-DU.The information of the serving cell includes: the frequency letter of cell ID, cell Breath, uplink bandwidth, downstream transmission bandwidth information, Physical Cell Identifier, tracing area mark (TAI) or Tracking Area Code, It is public land mobile network (PLMN) identification list of broadcast, transmission receiving point (TRP) information, wave beam (Beam) information, described Physic channel information in cell, transmitting channel information in the cell, logical channel information and/or the DU points in the cell The cell access layer (AP) for F1 interface matched identifies.The cell ID can be unique on Cell Global Identity or DU Cell ID or other cell IDs received from O&M.The cell AP of the DU distribution identifies the cell for establishing F1 interface Signaling connection is used for transmission the relevant information of cell.The information of the serving cell also includes clock information, such as System Frame Number (SFN)。
The ability information of-DU.The DU ability information include the caching capabilities of DU, the capacity information of DU, antenna ability, The ability of the ongoing interface of the information and/or DU of power.
- DU is the downlink TEID of RRC information transmission distribution.By F1 establishment process distributing user plane channel, for leading to It crosses user plane channel and transmits RRC information between DU and CU, wherein RRC information is carried on certain SRB.
In the application, user plane channel can be it is public on a DU and CU interface, between DU and CU Transmit the RRC information of all UE；Corresponding this method needs the data in user plane channel when transmitting RRC information Information comprising UE mark, cell ID, the information of TAI, SRB and/or logic channel in packet header.The mark of the UE can be DU UE AP ID and/or CU UE AP ID.When DU sends RRC information to CU, it is not required in the packet header of the transmission RRC information It to include the information of logic channel, because CU is by parsing described in RRC information is known that and has received from which logic channel Message.The RRC that the user plane channel can be used to transmit the RRC information on all SRB or be used for transmission on SRB0 Message.When the user plane channel is used for transmission the RRC information on SRB0, the use of RRC information transmission on other SRB Family plane channel can be established during UE access, in this way the user plane channel for RRC information transmission on other SRB Aiming at each UE, it is specifically shown in described in embodiment of the Fig. 5 to Fig. 6.When the RRC information being used for transmission on all SRB, The information comprising SRB is needed in the data packet head in user plane channel.When the user plane channel is used for transmission on SRB0 RRC information when, the information comprising SRB is not needed in the data packet head in user plane channel.
User plane channel can also be common under a cell, and as it is flat to establish a common user for each cell Face channel, for transmitting the RRC information of all UE in respective cell between DU and CU.Corresponding this method disappears in transmission RRC When breath, the letter comprising UE mark, the information of SRB and/or logic channel in the data packet head in user plane channel is needed Breath.The mark of the UE can be DU UE AP ID and/or CU UE AP ID.When DU sends RRC information to CU, the biography The information comprising logic channel is not needed in the packet header of defeated RRC information, because CU is known that by parsing RRC information from which The message is had received on logic channel.The user plane channel can be used to transmit on all SRB of UE in respective cell RRC information or be used for transmission RRC information in respective cell on UE SRB0.When the user plane channel is used for transmission When RRC information on SRB0, the user plane channel that RRC information is transmitted on other SRB can be during UE access It establishes, is specifically shown in Fig. 5 to figure aiming at each UE for the user plane channel of RRC information transmission on other SRB in this way Described in 6 embodiment.When the RRC information being used for transmission on all SRB, needed in the data packet head in user plane channel Information comprising SRB.Number when the user plane channel is used for transmission the RRC information on SRB0, in user plane channel According to not needing the information comprising SRB in packet header.
User plane channel can also be under a cell to be that each SRB distributes individual user plane channel, for example, SRB0, SRB1 and SRB2 distribute different user plane channels, for transmitting all UE on corresponding SRB between DU and CU RRC information.Corresponding this method needs in the data packet head in user plane channel when transmitting RRC information comprising UE The information of mark and/or logic channel.The mark of the UE can be DU UE AP ID and/or CU UE AP ID.When DU is sent out When sending RRC information to CU, the information comprising logic channel is not needed in the packet header of the transmission RRC information, because CU passes through solution Analysis RRC information is known that has received the message from which logic channel.In addition, being directed to this method, can be built in F1 The user plane channel for RRC information transmission is established during vertical for each SRB of each cell；Alternatively, can also be in F1 It is that the SRB0 of each cell establishes the user plane channel for RRC information transmission in establishment process, for owning in this cell The transmission of UE RRC information on SRB0, and the user plane channel for being used for RRC information transmission on other SRB can be in UE access During establish, the user plane channel transmitted in this way for the upper RRC information of other SRB is aiming at each UE, specifically As described in the embodiment of Fig. 5 to Fig. 6.
Corresponding above-mentioned each case, DU distribute the downlink TEID of appropriate level.
Information in the data packet head of above-mentioned user plane channel needs these information in RAN container (container) It is different from RAN container content in the existing packet header GTP-U, it is therefore desirable to define new RAN container.
Step 202, CU receives F1 and establishes request message.CU saves the information received, sends F1 and establishes response message to DU.
If CU has received the ability information of DU, CU dispatches UE using the information, such as determines that selection is served Responsible equilibrium between the DU or the different DU of decision of UE.
Wherein, F1 establishes one or more combinations that response includes following information:
- CU mark.The CU mark can be the either individual CU mark of mark of gNB.
The PLMN identification list that-CU is supported
Cell configuration list.The community configured information includes: the configuration of common signal channel in cell ID, the cell What the scheduling information and/or the CU that information, the system information in the cell, the system information are sent were distributed connects for F1 The cell AP mark of mouth.The cell ID can be on Cell Global Identity or DU unique on unique cell ID or CU Cell ID.The common signal channel configuration information is matched comprising physical channel configuration information, transport channel configuration information, logic channel Confidence breath.The system information includes Master Information Block MIB, system information block.CU is according to the clock information of the cell received from DU The scheduling information of decision systems information.CU from the clock information for the cell that DU is received (such as SFN) be included in system information in. The cell AP of the CU distribution identifies the cell signaling connection for establishing F1 interface, is used for transmission the relevant information of cell.This In, F1 is established in response if including cell configuration list, is equal to complete cell foundation in F1 establishment process.
- CU is the uplink TEID of RRC information transmission distribution.By F1 establishment process distributing user plane channel, for leading to It crosses user plane channel and transmits RRC information between DU and CU.Identical as described in step 201, the user plane channel can With common under being public on this DU and CU interface or a cell or be for SRB each under cell distribution one A user plane channel, for each method, CU distributes the TEID of appropriate level.The user plane channel can be used to pass RRC information on defeated all SRB or the RRC information being used for transmission on SRB0, it is specifically identical as described in step 201, here It repeats no more.Each method is corresponded to, the information for including in the data packet head in user plane channel is different, specific method and step Identical in 201, which is not described herein again.
As described above, being equal to establish by F1 if establishing in response message in F1 includes cell configuration list Process configures the cell needed on DU, also, includes system information and system information in cell in cell configuration list The scheduling information of transmission, the system information for being equivalent to need to broadcast in cell are sent to DU, and such DU can be with rapid operation. Alternatively, cell establishment process is also possible to individual process, in this case, in F1 as another method of the invention Establishing does not include cell configuration list in response message.Corresponding this method, also includes step:
Step 203, CU sends cell and establishes request message to DU.It includes the cell to be configured that the cell, which establishes request message, Information.So the cell information to be configured is identical as the community configured information in step 202, which is not described herein again.
If corresponding to each cell or each cell by user plane channel transfer RRC information between DU and CU The method that each lower SRB establishes a user plane channel, it includes that CU distributes to establish cell that cell, which establishes request message, Data feedback channel mark or CU be to establish each SRB of cell distribution data feedback channel identify.For every under each cell A kind of method that SRB establishes a user plane channel can be used in the process for each SRB foundation of each cell The user plane channel of RRC information transmission can also be that the SRB0 of each cell is established for RRC information in F1 establishment process The user plane channel of transmission, the transmission for all UE RRC information on SRB0 in this cell.And it is used for RRC on other SRB The user plane channel of message transmission can be established during UE access, in this way for RRC information transmission on other SRB User plane channel is specifically shown in described in embodiment of the Fig. 5 to Fig. 6 aiming at each UE.
Step 204, DU sends cell and establishes response message to CU.
If corresponding to each cell or each cell by user plane channel transfer RRC information between DU and CU The method that each lower SRB establishes a user plane channel, it is to establish what cell was distributed that cell, which establishes response message comprising DU, Down going channel mark or DU are the down going channel mark for establishing each SRB of cell distribution.For under each cell each The method that SRB establishes a user plane channel can disappear for each SRB foundation of each cell for RRC in the process The user plane channel for ceasing transmission can also be that the SRB0 of each cell is established for RRC information transmission in F1 establishment process User plane channel, the transmission for all UE RRC information on SRB0 in this cell.And it is used for RRC information on other SRB The user plane channel of transmission can be established during UE access, in this way the user for RRC information transmission on other SRB Plane channel is specifically shown in described in embodiment of the Fig. 5 to Fig. 6 aiming at each UE.
Cell establishment process can be used for configuring a cell or the multiple cells of configuration.If configuring a cell, institute The message for stating step 203 and step 204 is sent by cell signaling connection, i.e., cell establishes request and cell establishes response message In comprising DU distribution cell AP mark and CU distribution cell AP mark, in this case, cell establish request and cell build It can not need to include cell ID in vertical response message.
In this method, the system information for needing to broadcast in cell is sent to by cell establishment process by DU, such DU exists Cell sends system information after configuring as early as possible.As another method of the invention, the transmission of system information can be list Only process.Corresponding this method, also includes step:
Step 205, CU sends system information transmissions message to DU.The message is comprising in cell ID, the cell The scheduling information that system information, the system information are sent.CU believes according to the clock information decision systems of the cell received from DU The scheduling information of breath.CU from the clock information for the cell that DU is received such as SFN be included in system information in.
System information transmissions process can be used for sending the system information of a cell or multiple cells.If sending one The message of the system information of a cell, the step 205 is sent by cell signaling connection, i.e., wraps in system information transmissions message The cell AP mark of the distribution containing DU and the cell AP mark of CU distribution, in this case, can not in system information transmissions message It needs comprising cell ID.
So far, that is, the description of F1 interface building method one of the present invention is completed.In this way, can not only exchange DU and The application layer message of CU reduces the deployment cost of operator, can also after DU starting the automatic good DU and CU of rapid configuration public affairs Resource altogether is ready for the access of user, achievees the purpose that quick start.
The method for building up two of ongoing interface of the present invention is as described in Figure 3.CU initiates F1 interface establishment process in this method.The party Method can be used for O&M and CU and DU has interface or only has interface with CU.The method for building up of this ongoing interface includes the side DU Processing and the side CU processing, here, for convenience of description for the sake of, the method for building up is introduced in a manner of interacting between DU and CU, The method comprising the steps of:
Step 301, CU sends F1 and establishes request message to DU.
The transport Layer address of the CU DU of being connected is configured to CU by operation and maintenance system O&M.O&M is the application layer on CU Information configuration is to CU.Application layer message configuration if O&M is only and CU has interface, on O&M each DU that also CU is connected To CU.
Wherein, F1, which establishes request message, may include one or more combinations of following information:
- CU mark.The CU mark can be the either individual CU mark of mark of gNB.
The PLMN identification list that-CU is supported
The information list of the upper serving cell of-DU.The information of the serving cell includes: the frequency letter of cell ID, cell It is breath, uplink bandwidth, downstream transmission bandwidth information, Physical Cell Identifier, tracing area mark TAI or Tracking Area Code, wide It is the PLMN identification list broadcast, transmission receiving point TRP information, wave beam Beam information, physic channel information in the cell, described small Transmitting channel information in area, the cell access for F1 interface of logical channel information and/or DU distribution in the cell Layer AP mark.The cell ID can be unique cell ID on Cell Global Identity or DU or received from O&M other Cell ID.The cell AP of the DU distribution identifies the cell signaling connection for establishing F1 interface, is used for transmission cell correlation Information.The information of the serving cell also includes clock information, such as system frame number SFN.Preferably, when O&M only has with CU When interface, the application layer message on each DU that CU to be connected is configured to CU by O&M, then CU is built in the F1 connection for being sent to DU The information list of serving cell on DU is carried in vertical request message.
Cell configuration list.The community configured information includes: the configuration of common signal channel in cell ID, the cell What the scheduling information and/or the CU that information, the system information in the cell, the system information are sent were distributed connects for F1 The cell AP mark of mouth.The cell ID can be on Cell Global Identity or DU unique on unique cell ID or CU Cell ID.The common signal channel configuration information is matched comprising physical channel configuration information, transport channel configuration information, logic channel Confidence breath.The system information includes Master Information Block MIB, system information block.CU is according to the clock information decision systems of DU cell The scheduling information of information.CU is included in the clock information (such as SFN) of DU cell in system information.The cell of the CU distribution AP identifies the cell signaling connection for establishing F1 interface, is used for transmission the relevant information of cell.Here, F1 is established in request such as Fruit includes cell configuration list, is equal to complete cell foundation in F1 establishment process.
- CU is the uplink TEID of RRC information transmission distribution.By F1 establishment process distributing user plane channel, for leading to It crosses user plane channel and transmits RRC information between DU and CU.Identical as described in step 201, the user plane channel can With common under being public on this DU and CU interface or a cell or be for SRB each under cell distribution one A user plane channel.The user plane channel can be used to transmit the RRC information on all SRB or be used for transmission SRB0 On RRC information, specifically identical as described in step 201, which is not described herein again.For each method, CU distributes corresponding stage Other TEID.Every case is corresponded to, the information for including in the data packet head in user plane channel is different, specific method and step Identical in 201, which is not described herein again.If be used for transmission the user plane channel of RRC information be it is common under each cell or Each SRB is common under each cell, then the CU may be embodied in cell for the uplink TEID of RRC information transmission distribution and match In confidence breath.It can in the process be every for the method that each SRB under each cell establishes a user plane channel Each SRB of a cell establishes the user plane channel for RRC information transmission, can also be each small in F1 establishment process The SRB0 in area establishes the user plane channel for RRC information transmission, for all UE RRC information on SRB0 in this cell Transmission.And being used for the user plane channel that RRC information is transmitted on other SRB can establish during UE access, use in this way In the user plane channel that RRC information on other SRB is transmitted aiming at each UE, it is specifically shown in the embodiment of Fig. 5 to Fig. 6 It is described.
Step 302, DU receives F1 and establishes request message.DU saves the information received.If DU has received cell configuration Information, DU configure corresponding cell.DU sends F1 and establishes response message to CU.
Wherein, F1, which establishes response, may include one or more combinations of following information:
- DU mark
The ability information of-DU.The DU ability information include the caching capabilities of DU, the capacity information of DU, antenna ability, The ability of the ongoing interface of the information and/or DU of power.
The configuration information of cell.Here community configured information is actual disposition information of the DU to cell, can be with CU's Request is different.
- DU is the downlink TEID of RRC information transmission distribution.By F1 establishment process distributing user plane channel, for leading to It crosses user plane channel and transmits RRC information between DU and CU.Identical as described in step 201, the user plane channel can With common under being public on this DU and CU interface or a cell or be for SRB each under cell distribution one A user plane channel.The user plane channel can be used to transmit the RRC information on all SRB or be used for transmission SRB0 On RRC information, specifically identical as described in step 201, which is not described herein again.For each method, CU distributes corresponding stage Other TEID.Each method is corresponded to, the information for including in data packet head is different, and specific method is identical with step 201, here It repeats no more.If it is every under common under each cell or each cell for being used for transmission the user plane channel of RRC information A SRB is common, then the CU is that the uplink TEID of RRC information transmission distribution may be embodied in community configured information.For The method that each SRB establishes a user plane channel under each cell can be in the process each of each cell SRB establishes the user plane channel for RRC information transmission, can also be that the SRB0 of each cell is established in F1 establishment process Transmission for the user plane channel of RRC information transmission, for all UE RRC information on SRB0 in this cell.And it is used for The user plane channel that RRC information is transmitted on other SRB can be established during UE access, be used for other SRB in this way The user plane channel of RRC information transmission is specifically shown in described in embodiment of the Fig. 5 to Fig. 6 aiming at each UE.
CU saves the information received.If CU has received the ability information of DU, CU dispatches UE, example using the information Such as determine that selection serves the DU of UE or determines the responsible equilibrium between different DU.CU sends F1 and establishes response message to DU.
As described above, being equal to establish by F1 if establishing in request message in F1 includes cell configuration list Process configures the cell needed on DU, also, includes system information and system information in cell in cell configuration list The scheduling information of transmission, the system information for being equivalent to need to broadcast in cell are sent to DU, and such DU can be with rapid operation. Alternatively, cell establishment process is also possible to individual process, in this case, in F1 as another method of the invention Establishing does not include cell configuration list in request message.Corresponding this method, also includes step:
Step 303, CU sends cell and establishes request message to DU.It includes the cell to be configured letter that cell, which establishes request message, Breath.So the cell information to be configured is identical as the community configured information in step 202, which is not described herein again.
If corresponded to every under each cell or each cell by user-plane transmissions RRC information between DU and CU A kind of method that SRB establishes a user plane channel, cell establish request message include CU be to establish cell distribute it is upper Row of channels mark or CU are the data feedback channel mark that establish each SRB of cell distribution.For under each cell each The method that SRB establishes a user plane channel can disappear for each SRB foundation of each cell for RRC in the process The user plane channel for ceasing transmission can also be that the SRB0 of each cell is established for RRC information transmission in F1 establishment process User plane channel, the transmission for all UE RRC information on SRB0 in this cell.And it is used for RRC information on other SRB The user plane channel of transmission can be established during UE access, in this way the user for RRC information transmission on other SRB Plane channel is specifically shown in described in embodiment of the Fig. 5 to Fig. 6 aiming at each UE.
Step 304, DU sends cell and establishes response message to CU.
If corresponding to each cell or each cell by user plane channel transfer RRC information between DU and CU The method that each lower SRB establishes a user plane channel, it is to establish what cell was distributed that cell, which establishes response message comprising DU, Down going channel mark or DU are the down going channel mark for establishing each SRB of cell distribution.For under each cell each The method that SRB establishes a user plane channel can disappear for each SRB foundation of each cell for RRC in the process The user plane channel for ceasing transmission can also be that the SRB0 of each cell is established for RRC information transmission in F1 establishment process User plane channel, the transmission for all UE RRC information on SRB0 in this cell.And it is used for RRC information on other SRB The user plane channel of transmission can be established during UE access, in this way the user for RRC information transmission on other SRB Plane channel is specifically shown in described in embodiment of the Fig. 5 to Fig. 6 aiming at each UE.
In this method, the system information for needing to broadcast in cell is sent to by cell establishment process by DU, such DU exists Cell sends system information after configuring as early as possible.As another method of the invention, system information transmission be can be individually Process.Corresponding this method, also includes step:
Step 305, CU sends system information transmissions message to DU.System information transmissions Messages Message include cell ID, The scheduling information that system information, the system information in the cell are sent.CU is determined according to the clock information of DU cell The scheduling information for information of uniting.CU is included in the clock information such as SFN of DU cell in system information.
Cell establishment process can be used for configuring a cell or the multiple cells of configuration.If configuring a cell, institute The message for stating step 303 and step 304 is sent by cell signaling connection, i.e., includes the cell AP mark of DU distribution in the described message Know and the cell AP of CU distribution is identified, can not need to include cell ID in this case, in the message.
System information transmissions process can be used for sending the system information of a cell or multiple cells.If sending one The message of the system information of a cell, the step 305 is sent by cell signaling connection, i.e., distributes in the described message comprising DU Cell AP mark and CU distribution cell AP mark, can not need to include cell ID in this case, in the message.
So far, that is, the description of F1 interface building method two of the present invention is completed.In this way, can not only exchange DU and The application layer message of CU reduces the deployment cost of operator, can also work in the case where O&M and CU have interface.May be used also With the public resource of the good DU and CU of rapid configuration automatic after DU starts, it is ready for the access of user, reaches quick start Purpose.
The method for building up three of ongoing interface of the present invention is as described in Figure 4.CU triggers F1 interface establishment process in this method.The party Method can be used for O&M and CU and DU has interface or only has the case where interface with CU.The method for building up of this ongoing interface includes The side DU processing and the side CU processing, here, for convenience of description for the sake of, the foundation is introduced in a manner of interacting between DU and CU Method, the method comprising the steps of:
Step 401, CU sends F1 and establishes requirement message to DU.
The transport Layer address of the CU DU of being connected is configured to CU by operation and maintenance system O&M.O&M is the application layer on CU Information configuration is to CU.Application layer message configuration if O&M is only and CU has interface, on O&M each DU that also CU is connected To CU.
Wherein, F1, which establishes requirement message, may include one or more combinations of following information:
- CU mark.The CU mark can be the either individual CU mark of mark of gNB.
The PLMN identification list that-CU is supported
The information list of the upper serving cell of-DU.The information of the serving cell includes: the frequency letter of cell ID, cell It is breath, uplink bandwidth, downstream transmission bandwidth information, Physical Cell Identifier, tracing area mark TAI or Tracking Area Code, wide It is the PLMN identification list broadcast, transmission receiving point TRP information, wave beam Beam information, physic channel information in the cell, described small Transmitting channel information in area, the cell access for F1 interface of logical channel information and/or DU distribution in the cell Layer AP mark.The cell ID can be unique cell ID on Cell Global Identity or DU or received from O&M other Cell ID.The cell AP of the DU distribution identifies the cell signaling connection for establishing F1 interface, is used for transmission cell correlation Information.The information of the serving cell also includes clock information, such as system frame number SFN.
Step 402, DU sends F1 and establishes request message to CU.DU is configured from O&M or CU obtains the letter of the application layer on DU Breath.
Wherein, F1, which establishes request message, may include one or more combinations of following information:
- DU mark
The information list of the upper serving cell of-DU.The information of the serving cell includes: the frequency letter of cell ID, cell It is breath, uplink bandwidth, downstream transmission bandwidth information, Physical Cell Identifier, tracing area mark TAI or Tracking Area Code, wide It is the PLMN identification list broadcast, transmission receiving point TRP information, wave beam Beam information, physic channel information in the cell, described small Transmitting channel information in area, the cell access for F1 interface of logical channel information and/or DU distribution in the cell Layer AP mark.The cell ID can be unique cell ID on Cell Global Identity or DU or received from O&M other Cell ID.The cell AP of the DU distribution identifies the cell signaling connection for establishing F1 interface, is used for transmission cell correlation Information.The information of the serving cell also includes clock information, such as system frame number SFN.
Corresponding DU is applied the mode of layer information from CU, i.e., contains if the F1 of step 401 establishes requirement message The information list of the upper serving cell of DU, then the step is not needed comprising the information.
The ability information of-DU.The DU ability information include the caching capabilities of DU, the capacity information of DU, antenna ability, The ability of the ongoing interface of the information and/or DU of power.
- DU is the downlink TEID of RRC information transmission distribution.By F1 establishment process distributing user plane channel, for leading to It crosses user plane channel and transmits RRC information between DU and CU.In the channel rank and usage and step 201 of particular user plane Identical, which is not described herein again.
Step 403, CU receives F1 and establishes request message.CU saves the information that receives, and send F1 establish response message to DU。
If CU has received the ability information of DU, CU dispatches UE using the information, such as determines that selection is served Responsible equilibrium between the DU or the different DU of decision of UE.
Wherein, F1, which establishes response, may include one or more combinations of following information:
The PLMN identification list that-CU is supported
Cell configuration list.The community configured information includes: the configuration of common signal channel in cell ID, the cell What the scheduling information and/or the CU that information, the system information in the cell, the system information are sent were distributed connects for F1 The cell AP mark of mouth.The cell ID can be on Cell Global Identity or DU unique on unique cell ID or CU Cell ID.The common signal channel configuration information is matched comprising physical channel configuration information, transport channel configuration information, logic channel Confidence breath.The system information includes Master Information Block MIB, system information block.CU is according to the clock information decision systems of DU cell The scheduling information of information.CU is included in the clock information (such as SFN) of DU cell in system information.The cell of the CU distribution AP identifies the cell signaling connection for establishing F1 interface, is used for transmission the relevant information of cell.Here, F1 is established in response such as Fruit includes cell configuration list, is equal to complete cell foundation in F1 establishment process.
- CU is the uplink TEID of RRC information transmission distribution.By F1 establishment process distributing user plane channel, for leading to It crosses user plane channel and transmits RRC information between DU and CU.Identical as described in step 201, the user plane channel can With common under being public on this DU and CU interface or a cell or be for SRB each under cell distribution one A user plane channel.The user plane channel can be used to transmit the RRC information on all SRB or be used for transmission SRB0 On RRC information, specifically identical as described in step 201, which is not described herein again.For each method, CU distributes corresponding stage Other TEID.Each method is corresponded to, the information for including in the data packet head in user plane channel is different, specific method and step Identical in 201, which is not described herein again.
As described above, being equal to establish by F1 if establishing in response message in F1 includes cell configuration list Process configures the cell needed on DU, also, includes system information and system information in cell in cell configuration list The scheduling information of transmission, the system information for being equivalent to need to broadcast in cell are sent to DU, and such DU can be with rapid operation. Alternatively, cell establishment process can be individual process as another method of the invention, in this case, built in F1 It does not include cell configuration list in vertical response message.Specific steps are described identical as 203 and 204, and which is not described herein again.
In this method, the system information for needing to broadcast in cell is sent to by cell establishment process by DU, such DU exists Cell sends system information after configuring as early as possible.As another method of the invention, system information transmission be can be individually Process.Corresponding this method, specific steps are identical as described in 205, and which is not described herein again.
When the application layer message of DU updates, such as the ability information or clock information of DU update, and DU sends DU and matches Update message is set to CU, notifies the application layer message of CU update.CU saves the information received.Optionally, CU can also send DU Configuration updates response message to DU.When CU receives the more new information of DU, when needing to update system information, CU sends system information more For new information to DU, the message includes the system information updated and/or the scheduling information of system information.CU can also be matched by DU The scheduling information for updating system information/or system information that response message transmission updates is set to DU.
When the application layer message of CU updates, such as the PLMN list information that CU is supported, CU send CU configuration and update Message is to DU, the application layer message for notifying DU to update.DU saves the information received.Optionally, DU can also send CU configuration more New response message is to DU.
When the system information between CU and DU by user plane channel to transmit when, the user plane channel It include the scheduling information of system information in data packet head.The packet header is included in the expansion head of GTP-U.
When the paging message between CU and DU by user plane channel to transmit when, the user plane channel Comprising needing to send the cell list of paging message or the discontinuous reception of tracing area identification list, paging in data packet head The logical channel information that DRX, priority and/or the message are sent.The packet header is included in the expansion head of GTP-U.
The method of UE access of the present invention is as described in Figure 5, and this method can be used for adhering to Attach, and packet data network PDN connects Connect the scenes such as foundation.It is gNB in the access network entity that UE and core net (including AMF and UPF) see.If gNB further divides It is sightless in UE and core net at CU and DU functional entity.So being described between UE in last 3GPP specification RRC process between UE and gNB is described when communication.Described when process between description and core net gNB and Process between AMF or UPF.If gNB is divided into the functional entity of CU and DU, actually received first in the side gNB from UE's The entity of RRC information is DU, has been sent to CU by DU.Being received first in the side gNB from the entity of the AMF NG message come is CU, So it is simple in order to describe in the present invention, the interface procedure between UE and gNB is directly described as the process of UE and DU, and Process between gNB and AMF or UPF is directly described as the process of CU and AMF or UPF, other embodiments are also similar, this will Main contents of the invention are not influenced.Be omitted here the detailed description of step unrelated to the invention, for example, AMF and SMF and Process between UPF.The method comprising the steps of:
Step 501, UE sends RRC connection request message to base station.
Step 502, DU receives the message come from UE.DU receives the message come from UE from CCCH, it is known that UE is in the free time Mode or an inactive mode.DU sends the RRC information received to CU by user plane channel.Disappear depending on being used for transmission RRC The rank in the user plane channel of breath, cell e.g. connected for each DU with CU, each or each each SRB of cell , it is different to send the information for including in the data packet head in the user plane channel of RRC information.
If the user plane channel be it is public on a DU and CU interface, need in data packet head comprising UE The information of mark, cell ID, TAI and/or SRB.The mark of the UE can be DU UE AP ID.The cell ID is DU receives the message come from UE in which cell.The cell ID be under Cell Global Identity or DU unique cell ID or Unique cell ID under CU.If the cell ID is unique cell ID under DU, the message also includes DU mark. TAI is the mark of the TA where cell.As another method of the invention, CU has been informed by F1 establishment process DU TAI where each cell does not need the information comprising entire TAI here, it is only necessary to the PLMN mark comprising UE selection.
If the user plane channel be it is public in a cell, need in data packet head comprising UE mark, TAI And/or the information of SRB.The mark of the UE can be DU UE AP ID.According to receive UE come RRC information cell, DU is logical Cross is that the channel for RRC information transmission that the cell is established sends the message received to CU in F1 establishment process.TAI is institute State the mark of the TA where UE access cell.As another method of the invention, informed by F1 establishment process DU TAI where CU each cell, does not need the information comprising entire TAI here, it is only necessary to the PLMN mark comprising UE selection.
If the user plane channel for each SRB in each cell, needs The information of UE mark, and/or TAI.The mark of the UE can be DU UE AP ID.According to receive UE come RRC information it is small Area and the logic channel for receiving RRC information, DU is by being the foundation of SRB described in the cell in F1 establishment process for RRC The channel of message transmission sends the message received to CU.TAI is the mark of the TA where the UE access cell.As the present invention Another method, the TAI where each cell of CU has been informed by F1 establishment process DU, has not been needed here comprising whole The information of a TAI, it is only necessary to the PLMN mark comprising UE selection.
For the mode for only establishing user plane channel in F1 establishment process for RRC information transmission on SRB0, DU passes through The RRC information received from SRB0 is sent to CU in F1 establishment process for the user plane channel that SRB0 is established.It needs in data Information in packet header comprising UE mark, and/or TAI.The mark of the UE can be DU UE AP ID.TAI is the UE access The mark of TA where cell.As another method of the invention, it is each that CU has been informed by F1 establishment process DU TAI where cell does not need the information comprising entire TAI here, it is only necessary to the PLMN mark comprising UE selection.The channel Information includes gap marker TEID and/or transport Layer address.
Step 503, CU receives the user plane data come from DU.According to the RRC information for including in data is received, CU knows It is RRC connection request message.CU is the CU UE AP ID that UE is distributed on F1 interface.CU transmission is established UE context and is matched for UE The request message of radio bearer is set, request DU establishes UE context and is UE configured radio bearer, and the radio bearer is SRB Configuration.In the present embodiment, using radio bearer configuration request message as establishing UE context and being asked for UE configured radio bearer It asks and is illustrated for message.The message includes the one or more of following information element:
- CU is the CU UE AP ID of UE distribution.
- DU is the DU UE AP ID of UE distribution.
Cell ID where-UE.The cell ID is under Cell Global Identity or DU under unique cell ID or CU Unique cell ID.
The RB information to be configured.The RB for including in the message can be SRB and/or DRB.In this step, it to configure RB be SRB.
The configuration information of physical channel.
The configuration information of transmission channel
The configuration information of logic channel.
Data feedback channel information.The data feedback channel information of RRC information transmission on other outer SRB of SRB0 of CU distribution.It can To be that other SRB are common in addition to SRB0, or correspond to every SRB's.
The radio bearer configuration request message is also possible to UE context and establishes request or other message names without shadow Ring main contents of the invention.
Step 504, DU configures resource.DU send establish UE context and for UE configured radio bearer response message to CU.In the present embodiment, using radio bearer configuration response message as establish UE context and be UE configured radio bearer response It is illustrated for message.The message includes one or more combinations of following information:
- CU is the CU UE AP ID of UE distribution.
- DU is the DU UE AP ID of UE distribution.
For the RB information of UE configuration.The RB information is the configuration information of SRB.The RB information can also include DU points The down going channel information of RRC information transmission on other outer SRB of SRB0 matched.It is common to can be other SRB in addition to SRB0, Either corresponding every SRB's.
In order to reduce the time delay of F1 interface, the response message of step 504 can not also be executed.Corresponding this method, in step Include in rapid 503 message association identification (correlation id).CU is after having sent the message of step 503, directly Execute step 505.It also include identical correlation id in the data packet head of step 505.Request success of the DU 503 The RRC information received in ability sending step 505 when configuration is to UE.If the RB information of step 503 request configuration does not succeed, DU abandons the RRC information of sending step 505 to UE.DU is according to the association identification and step 505 data packet head in step 503 message In association identification know the corresponding relationship of the message.
The radio bearer configuration response message is also possible to UE context and establishes response or other message names without shadow Ring main contents of the invention.
Step 505, CU sends RRC connection by user plane channel and establishes message to DU.Disappear depending on being used for transmission RRC The rank in the user plane channel of breath, cell e.g. connected for each DU with CU, each or each each SRB of cell , it is different to send the information for including in the data packet head in the user plane channel of RRC information.
If the user plane channel be it is public on a DU and CU interface, need in data packet head comprising UE Mark, cell ID, the information of SRB and/or logical channel information.The mark of the UE can be DU UE AP ID and/or CU UE AP ID.The cell ID is the mark of UE access cell.The cell ID is unique under Cell Global Identity or DU Cell ID or CU under unique cell ID.
If the user plane channel be it is common in a cell, need in data packet head comprising UE mark, SRB Information and/or logical channel information.The mark of the UE can be DU UE AP ID and/or CU UE AP ID.According to UE The cell of access, CU is by being that the channel transmission for RRC information transmission that the cell is established receives in F1 establishment process Message is to DU.
If the user plane channel is to need for each SRB in each cell or for SRB0 in number According in packet header include UE mark and/or logical channel information.The mark of the UE can be DU UE AP ID and/or CU UE AP ID.CU is by being that the channel transmission for RRC information transmission that SRB described in the cell is established receives in F1 establishment process Message to DU.
Step 506, DU sends the RRC information received to UE.
Step 507, UE sends RRC connection and establishes completion to base station.
Step 508, DU sends the RRC information received to CU by user plane channel.It is provided according to from allocated DCCH The message received on source, DU know be which UE message.It include the mark of UE in the data packet head in user plane channel, it is described The mark of UE is DU UE AP ID and/or CU UE AP ID.
The mode in one user plane channel of a cell is corresponded to, may include in the data packet head in user plane channel The information of SRB, such as SRB1 or SRB2.Or CU can know that the SRB for receiving RRC information believes by parsing RRC information indirectly Breath.
Each corresponding SRB has the mode in a user plane channel, and DU is selected according to the SRB for receiving RRC information at which The RRC information received is transmitted on the user plane channel of a foundation to CU.
Step 509, CU sends initial UE message to AMF.
It sends downlink NAS without establishing session, AMF to UE if AMF only needs to send NAS message and transmits message To base station.The initial context for establishing session then AMF sending step 510 if necessary establishes request message to base station.
Step 510, AMF sends initial UE context and establishes request message to CU.
If CU has received downlink NAS transmission message from AMF, CU directly following step is without executing step 511 to step 516 RB reconfiguration course.
CU sends RRC information downlink NAS by control plane channel or user plane channel and is transferred to DU.Correspondence passes through control Plane processed sends RRC information to the mode of DU, and CU sends downlink RRC transmission message to DU.The message includes following information One or more combinations:
- CU is the CU UE AP ID of UE distribution.
- DU is the DU UE AP ID of UE distribution.
RRC information.The RRC information is downlink NAS transmission message in the present embodiment.
By way of RRC information on the corresponding SRB except user plane channel sends SRB0, CU is sent out by GTP-U Send downlink NAS transmission message to DU.
The corresponding RRC information other than SRB0 on other SRB a user plane channel come by way of transmitting, user It may include the information of SRB, such as SRB1 or SRB2 in the data packet head of plane channel.In the data packet head in user plane channel The information in which logical message transmission can also be needed comprising the RRC information.
Corresponding RRC information each SRB other than SRB0 on other SRB has the mode in a user plane channel, CU RRC information is sent on the corresponding channel to DU, and DU is according to the channel for receiving information, it is known that the RRC information is on which SRB It is sent to UE.
DU sends the RRC information received to UE.
Step 511, CU sends radio bearer reconfiguration request message to DU.The message include following information one kind or A variety of combinations:
- CU is the CU UE AP ID of UE distribution.
- DU is the DU UE AP ID of UE distribution.
Want increased RB information.It is described want increased RB information include RB mark, the RB physical channel with confidence The QoS flow for ceasing, being mapped on the configuration information of the logic channel of the configuration information of the transmission channel of the RB, the RB, the RB The data feedback channel information of Flow information and/or the RB.The QoS flow Flow information mapped on the RB include flow mark, The corresponding Qos information of flow.The data feedback channel information includes transport Layer address and uplink TEID.
The RB information to be reconfigured.Weight of the RB information to be reconfigured comprising RB mark, the physical channel of the RB Configuration information, the reconfiguration information of the transmission channel of the RB, the RB logic channel reconfiguration information, want on the RB The Qos flow to be transmitted on the Qos flow information to be deleted in increased QoS Flow information, the RB and/or the RB Information.It includes Qos flow mark, Qos flow Qos information that increased QoS Flow information is wanted on the RB.It is wanted on the RB The Qos parameter that the QoS Flow information reconfigured includes Qos flow mark, to be reconfigured.The QoS to be deleted on the RB Flow information is identified comprising Qos flow.
The RB information to be deleted.The RB information to be deleted is identified comprising RB.
User plane tunnel data transport between DU and CU can share a channel GTP-U with multiple RB, can also be with every One RB uses a channel GTP-U.
Step 512, DU distributes resource.DU sends radio bearer reconfiguration response message to CU.The message includes following One or more combinations of information:
- CU is the CU UE AP ID of UE distribution.
- DU is the DU UE AP ID of UE distribution.
The configuration information of-RB.The configuration information of RB is identified comprising RB, the down going channel information of DU distribution.The channel letter Breath includes transport Layer address and uplink TEID.
Step 513, CU sends RRC information RRC connection reconfiguration by user plane channel and sets to DU.CU is sent out by GTP-U RRC connection reconfiguration is sent to set to DU.It include the mark and/or logical channel information of UE, institute in the data packet head in user plane channel The mark for stating UE is DU UE AP ID and/or CU UE AP ID.If DU and CU are on the SRB of each UE in addition to SRB0 RRC information transmission establishes user plane channel, then does not need to identify comprising UE in the data packet head in the user plane channel.
The mode in one user plane channel of a cell is corresponded to, may include in the data packet head in user plane channel The information of SRB, such as SRB1 or SRB2.
Each corresponding SRB has a mode in a user plane channel, CU according in F1 establishment process or step 503 and It is that the user plane channel transmission RRC connection reconfiguration that corresponding SRB is established sets message to DU in 504.DU is according to receiving the logical of information Road, it is known that the RRC information is sent to UE on which SRB.
Step 514, DU sends the RRC information received from CU to UE.
Step 515, UE sends RRC connection reconfiguration and sets completion message to base station.
Step 516, DU sends the RRC information received to CU by user plane channel.It is provided according to from allocated DCCH The message received on source, DU know be which UE message.DU sends uplink RRC information to CU by GTP-U.User plane is logical It include the mark of UE in the data packet head in road, the mark of the UE is DU UE AP ID and/or CU UE AP ID.If removed Outside SRB0, DU and CU are transmitted for the RRC information on the SRB of each UE and are established user plane channel, then the user plane is logical It does not need to identify comprising UE in the data packet head in road.
The mode in one user plane channel of a cell is corresponded to, may include in the data packet head in user plane channel The information of SRB, such as SRB1 or SRB2.Or CU can know that the SRB for receiving RRC information believes by parsing RRC information indirectly Breath.
Each corresponding SRB has the mode in a user plane channel, and DU is selected according to the SRB for receiving RRC information at which The RRC information received is transmitted on the user plane channel of a foundation to CU.
So far, that is, the description of the method for UE access of the present invention is completed.In this way, can solve gNB be divided into DU and When CU the problem of UE access, it can be used for Attach, the scenes such as PDU foundation guarantee that DU and CU supports the interconnection of multi-vendor equipment Intercommunication.RRC information is transmitted by user plane channel, reduces propagation delay time.
The method that UE of the present invention switches between the different DU of the same CU is as described in Figure 6.It is omitted here and nothing of the present invention Close the detailed description of step, such as the process between AMF and SMF and UPF.The method comprising the steps of:
Step 601, UE sends measurement report message to base station.DU is received after the RRC information that UE comes, and passes through user plane Channel sends the RRC information received to CU.Especially by control plane and the method and step that are sent by user plane channel 508 and step 516 in describe identical, which is not described herein again.The DU of this step is source DU (S-DU)
Step 602, CU determines to initiate the switching to UE.The purpose cell of switching is in another DU.CU determines to execute general The switching of MBB is executed before logical switching or disconnection.CU, which is sent, to be established UE context and disappears for the request of UE configured radio bearer It ceases and gives purpose DU (T-DU), for requesting T-DU to establish UE context and being UE configured radio bearer, the radio bearer includes The configuration of SRB and DRB.In the present embodiment, using radio bearer configuration message as establish UE context and for UE configure wirelessly hold It is illustrated for the request message of load.The message includes the one or more of following information element:
- CU is the CU UE AP ID of UE distribution.
Contextual information of-the UE in S-DU.The UE includes cell mark of the UE in source cell in the contextual information of S-DU Know, UE is in the RB configuration information of source cell and/or the ability information of UE etc..
Purpose cell ID.The cell ID be under Cell Global Identity or DU under unique cell ID or CU only One cell ID.
The RB information to be configured.The RB for including in the message can be SRB and/or DRB.In this step, it to configure RB be SRB and DRB information.
The configuration information of physical channel.
The configuration information of transmission channel
The configuration information of logic channel.
Data feedback channel information.Each corresponding DRB, the message include the data feedback channel information of CU distribution.Corresponding F1 is built The mode in user plane channel is only established during vertical for the RRC information transmission on SRB0, the message includes that CU is SRB points The data feedback channel information matched, the communication information can be it is corresponding it is each SRB's or other than SRB0 on every other SRB RRC information transmits common channel.The channel information includes transport Layer address and TEID.
The instruction of-MBB switching.It determines when executing MBB switching to include this information in CU.
The radio bearer configuration message is also possible to UE context and establishes request or other message names without influencing this The main contents of invention.
Step 603, T-DU configures resource.T-DU sends the response message established UE context and be UE configured radio bearer To CU.In the present embodiment, using radio bearer configuration response as establishing UE context and disappear for the response of UE configured radio bearer It is illustrated for breath.The message includes one or more combinations of following information:
- CU is the CU UE AP ID of UE distribution.
- T-DU is the DU UE AP ID of UE distribution.
For the RB information of UE configuration.The RB information includes the configuration information of SRB and DRB.Each corresponding DRB, it is described Message includes the down going channel information of T-DU distribution.It is only established in corresponding F1 establishment process for the RRC information transmission on SRB0 The mode in user plane channel, the message include the down going channel information that T-DU is SRB distribution, and the communication information can be It is corresponding it is each SRB's or the common channel of RRC information transmission all SRB on other than SRB0.The channel information includes transmission Layer address and TEID.
The radio bearer configuration response message is also possible to UE context and establishes response or other message names without shadow Ring main contents of the invention.
Step 604, CU sends RRC connection reconfiguration by user plane channel and sets message to S-DU.CU passes through individual F1AP message sends one or more combinations of following information to S-DU, or includes the one of following information in data packet head Kind or a variety of combinations:
The information switched between difference DU.If S-DU has received the information switched between different DU, S-DU is sending receipts After the RRC information arrived is to UE, stop sending data to UE.No longer receive the upstream data come from UE.
The instruction of-MBB.It, can after sending the RRC information received to UE if S-DU has received the information of MBB instruction To continue to send data to UE and receive the upstream data come from UE.S-DU is after receiving the data come from CU and sending stopping instruction Stop sending downlink data to UE and/or stops receiving the data come from UE.Or when S-DU decision stops sending data to UE, such as stop sending data to UE after S-DU is no longer received and confirmed from the uplink that UE comes.
It is also the DU UE AP ID of UE distribution comprising CU UE AP ID, S-DU that CU is UE distribution in the data packet head And/or send the logical channel information of RRC information.
Step 605, DU sends the RRC information received to UE.
Corresponding CU decision uses MBB to switch, and CU determines when S-DU stops sending downlink data to UE or stopping with UE's The method of communication, when CU determines that S-DU stops sending downlink data to UE or stopping and the communication of UE, CU, which sends data, to be stopped Instruction message is to S-DU.S-DU is received after the corresponding message that CU comes, and stops the communication with UE.If what is carried out is commonly to cut It changes, does not then need to execute above-mentioned processing.
No matter MBB switching or common switching, CU can be started to send data to T-DU, CU does not confirm UE And the data received from UPF are sent to T-DU.The data are PDCP PDU.
Here there are two types of the methods that data are sent:
Method one, data that are that CU directly not confirms UE and receiving from UPF are sent to T-DU.The data are PDCP PDU.The data forwarding between S-DU and T-DU is not needed.
Method two, data that are that CU directly not confirms UE and receiving from UPF are sent to T-DU.The data are PDCP PDU.In order to avoid the DU from source is successfully sent to UE and repeats to send in purpose DU some RLC PDU, S-DU is source The RLC context of survey is sent to T-DU.The PDCP PDU, T-DU that corresponding part is successfully transmitted only send the RLC that UE is not received PDU avoids the repetition of data from sending to UE without sending entire PDCP PDU to UE.Corresponding this method, it is also necessary to hold Row step 605a and step 605b.This method, which is suitable for T-DU and S-DU, the case where identical RB configuration.Optionally, S-DU is also The RLC PDU that UE does not confirm can be transmitted to T-DU.
Step 605a, S-DU send one message of RLC context transfer to CU.The message include following information one kind or A variety of combinations:
- CU is the CU UE AP ID of UE distribution.
- S-DU is the DU UE AP ID of UE distribution.
- RLC sends state.The RLC send state include the last one be successfully transmitted GTP-U data packet SN, not at The RLC SN that function sends GTP-U data packet SN and/or sends not successfully.
- PDCP transmits and receives state.It includes that the last one is successfully transmitted GTP-U data packet that the PDCP, which sends state, SN, the failed reception state for sending GTP-U data packet SN and/or uplink PDCP.DU is according to the feedback of rlc layer UE, to determine Which PDCP data packet UE is completely received, which PDCP data packet UE is not completely received, to determine that PDCP is sent Reception state.
The RLC context transfer can also make PDCP context transfer or other titles of the invention main without influencing Content.
In method of the invention, step 605a can also be only carried out, the transmitting and receiving state of PDCP is informed CU, thus CU Know and which PDCP data packet is sent to T-DU.
Step 605b, CU send two message of RLC context transfer to T-DU.The message include following information one kind or A variety of combinations:
- CU is the CU UE AP ID of UE distribution.
- T-DU is the DU UE AP ID of UE distribution.
- RLC sends state.It includes that the last one is successfully transmitted the SN of GTP-U data packet that the RLC, which sends state,.Not at The RLC SN that function sends GTP-U data packet SN and sends not successfully.
Step 605a and step 605b is not essential step of the invention.
Step 606, UE is synchronized to purpose cell.
Step 607, UE sends RRC connection and establishes completion to base station.T-DU sends the RRC received by user plane channel Message is to CU.The specific method that DU is sent to CU is identical as step 5016, and which is not described herein again.
Step 608, CU sends UE context release message to S-DU.The message includes the CU UE AP that CU is UE distribution ID, S-DU are the DU UE AP ID of UE distribution.
So far, that is, UE of the present invention is completed in the description of different DU method for switching between.In this way, can solve gNB The problem of UE switches when being divided into DU and CU avoids loss of data, guarantees that DU and CU supports interconnecting for multi-vendor equipment.Pass through RRC information is transmitted in user plane channel, reduces propagation delay time.
The method for building up of ongoing interface, UE access method and UE switching between above-mentioned as a variety of DU and CU provided by the present application The specific implementation of method.Present invention also provides CU device and DU device, it can be used for implementing DU processing and CU in the above method Processing.
Specifically, correspond to ongoing interface method for building up one, the application provides CU device and includes: transmission unit and receive single Member.
Wherein, receiving unit, the F1 for receiving DU transmission establish request message；Wherein, the F1 establishes request message In include one of following information or multiple combinations: DU mark, the ability information of the information list of the upper serving cell of DU, DU, DU is the downlink TEID of RRC information transmission distribution.Transmission unit establishes response message for sending F1 to the DU；Wherein, institute Stating F1 and establishing includes one of following information or multiple combinations in response message: PLMN identification list that CU mark, CU are supported, Cell configuration list, CU are the uplink TEID of RRC information transmission distribution.
Corresponding to ongoing interface method for building up one, DU device provided by the present application includes: transmission unit and receiving unit.
Wherein, transmission unit establishes request message for sending F1 to CU.Wherein, the F1, which is established in request message, wraps Include one of following information or multiple combinations: DU mark, the information list of the upper serving cell of DU, the ability information of DU, DU are The downlink TEID of RRC information transmission distribution.Receiving unit establishes response message for receiving the F1 that the CU is sent；Wherein, institute Stating F1 and establishing includes one of following information or multiple combinations in response message: PLMN identification list that CU mark, CU are supported, Cell configuration list, CU are the uplink TEID of RRC information transmission distribution.
Corresponding to ongoing interface method for building up two, CU device provided by the present application includes: transmission unit and receiving unit.
Wherein, transmission unit establishes request message to DU for sending F1.It includes following information in request message that F1, which is established, One of or multiple combinations: PLMN identification list that CU mark, CU are supported, the information list of the upper serving cell of DU, cell are matched Set list, the uplink TEID that CU is RRC information transmission distribution.Receiving unit establishes response for receiving the F1 that the DU is sent Message.It includes one of following information or multiple combinations in response message that F1, which is established: DU mark, the ability information of DU, cell Actual disposition information, DU be RRC information transmission distribution downlink TEID.
Corresponding to ongoing interface method for building up two, DU device provided by the present application includes: transmission unit and receiving unit.
Wherein, receiving unit, the F1 for receiving CU transmission establish request message to DU.F1 is established in request message One of following information or multiple combinations: the information column of CU is identified, CU is supported PLMN identification list, the upper serving cell of DU Table, cell configuration list, CU are the uplink TEID of RRC information transmission distribution.Transmission unit is established for sending F1 to the CU Response message.It includes one of following information or multiple combinations in response message that F1, which is established: DU mark, the ability information of DU, The actual disposition information of cell, DU are the downlink TEID of RRC information transmission distribution.
Corresponding to ongoing interface method for building up three, CU device provided by the present application includes: transmission unit and receiving unit.
Wherein, transmission unit establishes requirement message to DU for sending F1, is also used to receive the F1 in receiving unit and build After vertical request message, F1 is sent to the DU and establishes response message.Receiving unit is asked for receiving the F1 foundation that the DU is sent Seek message.Wherein, F1 is established in requirement message comprising one of following information or multiple combinations: CU mark, CU are supported The information list of the upper serving cell of PLMN identification list, DU.It includes one of following information or more in request message that F1, which is established, Kind combination: DU mark, the information list of the upper serving cell of DU, the ability information of DU, DU are the downlink of RRC information transmission distribution TEID.It includes one of following information or multiple combinations in response message that the F1, which is established: the PLMN identification list of CU support, Cell configuration list, CU are the uplink TEID of RRC information transmission distribution.
Corresponding to ongoing interface method for building up three, DU device provided by the present application includes: transmission unit and receiving unit.
Wherein, receiving unit, the F1 for receiving CU transmission establish requirement message；It is also used to send in the transmission unit After the F1 establishes request message, receives the F1 that the CU is sent and establish response message.Transmission unit, for being sent to the CU F1 establishes request message.F1 is established in requirement message comprising one of following information or multiple combinations: CU mark, CU are supported The information list of the upper serving cell of PLMN identification list, DU.It includes one of following information or more in request message that F1, which is established, Kind combination: DU mark, the information list of the upper serving cell of DU, the ability information of DU, DU are the downlink of RRC information transmission distribution TEID.It includes one of following information or multiple combinations in response message that F1, which is established: the PLMN identification list of CU support, cell Configured list, CU are the uplink TEID of RRC information transmission distribution.
Corresponding to UE access method, DU device provided by the present application includes: receiving unit, transmission unit and processing unit.
Wherein, receiving unit, for receiving the RRC connection request message of user terminal UE transmission.Transmission unit, for leading to Cross and base station in CU between user plane channel the RRC connection request message is sent to the CU.Processing unit is used In the radio bearer configuration request message for receiving the CU and sending, information configuration resource based on the received, and pass through the user Plane channel receives the RRC connection that the CU is sent and establishes message, and is transmitted to the UE；It is also used to receive what the UE was sent The RRC connection setup complete message is sent to described by RRC connection setup complete message by the user plane channel CU, and include the mark of the UE in the data packet head of relative users plane channel；It is also used to when not needing to establish session, The RRC that message is sent is transmitted according to the downlink NAS of AMF by CU described in control plane channel or user plane channel reception to disappear Downlink NAS transmission is ceased, and is transmitted to the UE.It include one of following information or a variety of in radio bearer configuration request message Combination: CU is cell mark where DU UE AP ID, the UE that CU UE AP ID, the DU of the UE distribution are the UE distribution Know, the configuration information of the RB information to be configured, the configuration information of physical channel, the configuration information of transmission channel, logic channel, on Row of channels information；The data feedback channel information is the RRC information transmission on other SRB in addition to SRB0 of CU distribution Row of channels information.
Corresponding to UE access method, CU device provided by the present application includes: receiving unit, transmission unit and processing unit.
Wherein, receiving unit, for being forwarded from UE's by DU described in the user plane channel reception between DU in base station RRC connection request message.Transmission unit, for sending radio bearer configuration request message to the DU.The radio bearer is matched Set in request message comprising one of following information or multiple combinations: CU is that CU UE AP ID, the DU of the UE distribution are institute Cell ID, the RB information to be configured, the configuration information of physical channel, biography where stating DU UE AP ID, the UE of UE distribution The configuration information of defeated channel, the configuration information of logic channel, data feedback channel information.Data feedback channel information is CU distribution for removing The data feedback channel information that RRC information is transmitted on other SRB except SRB0.Processing unit, for logical by the user plane Road sends RRC connection to the DU and establishes message, and is forwarded from the UE's by DU described in the user plane channel reception RRC connection setup complete message wraps in the data packet head in the user plane channel for carrying RRC connection setup complete message Include the mark of the UE；It is also used to when not needing to establish session, receives the downlink NAS that AMF is sent and transmit message, and pass through control Plane channel or user plane processed channel sends RRC information downlink NAS transmission to the DU.
Corresponding to UE switching method, CU device provided by the present application includes: transmission unit, processing unit and receiving unit.
Wherein, receiving unit, for issuing the survey of base station by the user plane channel reception UE between source DU in base station Measure report message.Processing unit after switching over for determination to UE, sends radio bearer to purpose DU and configures message；Also use In the radio bearer configuration response message for receiving the purpose DU transmission；It is also used to send RRC by the user plane channel Connection reconfiguration sets message to the source DU, and the instruction of the information switched between different DU and/or MBB are sent to the source DU；It is also used to send data to the purpose DU, after UE is synchronized to purpose cell, receives the purpose DU and pass through user plane The RRC connection setup complete message that channel is sent；RRC connection setup complete message is that the UE is sent to the base station.Hair Unit is sent, for sending UE context release message to the source DU.It includes one in following information that radio bearer, which configures message, Kind or multiple combinations: CU be UE distribution CU UE AP ID, UE in the contextual information of S-DU, purpose cell ID, to configure RB information, the configuration information of physical channel, the configuration information of transmission channel, the configuration information of logic channel, data feedback channel letter The instruction that breath, MBB switch；Include one of following information or multiple combinations in the radio bearer configuration response message: CU is that CU UE AP ID, the purpose DU of UE distribution are DU UE AP ID of UE distribution, are the RB information of UE configuration.
Corresponding to UE switching method, DU device in source provided by the present application include: first processing units, the second processing unit and Third processing unit.
Wherein, first processing units, for receive user terminal UE transmission measurement report message, be also used to by with base User plane channel between the CU to stand sends the measurement report message to the CU.The second processing unit, for by described CU described in user plane channel reception send RRC connection reconfiguration set message, and receive the information switched between different DU and/or The instruction of MBB.Third processing unit, the UE context release message sent for receiving the CU.
Corresponding to UE switching method, purpose DU device provided by the present application includes: first processing units, the second processing unit With third processing unit.
Wherein, first processing units, the radio bearer that the CU for receiving base station is sent configure message；Wherein, the nothing Line carrying configuration message includes one of following information or multiple combinations: CU is CU UE AP ID, the UE of UE distribution in S-DU Contextual information, purpose cell ID, the RB information to be configured, the configuration information of physical channel, transmission channel match confidence The instruction that breath, the configuration information of logic channel, data feedback channel information, MBB switch.The second processing unit, for being sent out to the CU Send radio bearer configuration response message；It include one of following information or a variety of in the radio bearer configuration response message Combination: CU is that CU UE AP ID, the purpose DU of UE distribution are DU UE AP ID of UE distribution, are the RB information of UE configuration.The Three processing units, the data sent for receiving the CU are also used to receive the UE and send after UE is synchronized to purpose cell RRC connection setup complete message, and forward the RRC to connect to the CU by the user plane channel between the CU and build It is vertical to complete message.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the present invention.

Claims (29)

1. a kind of method for building up of ongoing interface characterized by comprising
Base station centralized unit CU receives the ongoing interface F1 that base station distribution cells D U is sent and establishes request message；Wherein, the F1 Establish includes one of following information or multiple combinations in request message: information list, the DU of DU mark, the upper serving cell of DU Ability information, DU be radio resource control RRC message transmission distribution downlink tunnel Endpoint ID TEID；
The CU sends F1 to the DU and establishes response message；Wherein, it includes in following information that the F1, which is established in response message, One or more combinations: CU mark, CU support public land mobile network PLMN identification list, cell configuration list, CU For the uplink TEID of RRC information transmission distribution.
2. the method according to claim 1, wherein serving cell in the information list of serving cell on the DU Information include one of clock information and following information or multiple combinations: cell ID, the frequency information of cell, uplink pass Defeated bandwidth, downstream transmission bandwidth information, Physical Cell Identifier, tracing area identify the PLMN mark of TAI or Tracking Area Code, broadcast Know list, transmission receiving point TRP information, wave beam Beam information, physic channel information in the cell, in the cell transmit letter The cell access layer AP for F1 interface that logical channel information, the DU are distributed in road information, the cell is identified；And/or
Community configured information in the cell configuration list includes one of following information or multiple combinations: cell ID, Scheduling information that the configuration information of common signal channel in the cell, the system information in the cell, the system information are sent, The cell AP for F1 interface of the CU distribution is identified；And/or
The ability information of the DU include the caching capabilities of DU, the capacity information of DU, the ability of antenna, the information of power and/or The ability of the ongoing interface of DU；And/or
When it includes DU ability information that the F1, which is established in request message, this method comprises: the CU is believed using the DU ability Cease scheduling user's set UE；And/or
It, should after CU establishes response message to DU transmission F1 when F1 establishes response message not comprising cell configuration list Method include: CU send cell establish request message to DU, and the cell establish in request message carry to be configured it is small Area's information；The CU receives the cell that the DU is sent and establishes response message；And/or
When the scheduling not comprising system information and/or system information transmission in the cell in the community configured information When information, this method comprises: one or more cells of the CU correspondence establishment, send system information transmissions message to described DU, and include cell ID, the system information in the cell and/or system letter in the system information transmissions message Cease the scheduling information sent；And/or
The DU is distributed by the downlink TEID of RRC information transmission distribution for the user plane channel corresponding to different stage TEID；And/or
The CU is distributed by the uplink TEID of RRC information transmission distribution for the user plane channel corresponding to different stage TEID；
Wherein, the user plane channel is to distribute in F1 establishment process, for transmitting RRC information between DU and CU.
3. according to the method described in claim 2, it is characterized in that, the user plane channel is public on a DU and CU interface Total, for transmitting the RRC information of all UE between the DU and CU；In the data packet head of relative users plane channel comprising with One of lower information or multiple combinations: UE mark, cell ID, the information of TAI, SRB, the information of logic channel；Alternatively,
The user plane channel is all in one cell for transmitting between DU and CU to be common under a cell The RRC information of UE；Include one of following information or multiple combinations: UE mark in the data packet head of relative users plane channel Knowledge, the information of SRB, the information of logic channel；Alternatively,
It is that each Signaling Radio Bearer SRB is individually distributed that the user plane channel, which is under a cell, in DU and CU Between transmit the RRC information of all UE on corresponding SRB；In the data packet head of relative users plane channel comprising UE mark and or The information of logic channel；Alternatively,
The user plane channel is to distribute under a cell for SRB0, for transmitting all UE between DU and CU in SRB0 On RRC information；For other SRB of each cell in addition to SRB0, the user plane channel for carrying other SRB exists It is established during UE access, for RRC information of the transmission access UE on corresponding SRB between DU and CU.
4. according to the method described in claim 3, it is characterized in that, when the user plane channel established in the F1 establishment process When common under being public on a DU and CU interface or a cell, which is used for transmission all SRB On RRC information or the RRC information that is used for transmission on SRB0.
5. according to the method described in claim 4, it is characterized in that, when the user plane channel established in the F1 establishment process When the RRC information being used for transmission on SRB0, the user plane of RRC information transmission on other SRB in addition to the SRB0 Channel is established during UE access, and relative users plane channel corresponds to each UE；And/or
When the user plane channel established in the F1 establishment process is used for transmission the RRC information on SRB0, in relative users The information of SRB is not included in the data packet head of plane channel；And/or
When the user plane channel established in the F1 establishment process is used for transmission the RRC information on all SRB, mutually applying It include the information of SRB in the data packet head of family plane channel.
6. according to the method described in claim 2, it is characterized in that, when the user plane channel between the DU and CU is corresponding every SRB0 is established under every kind of SRB or each cell under a cell or each cell, and the cell establishes in request message comprising institute State CU be to establish cell distribution uplink TEID or the CU be to establish cell every kind of SRB distribute uplink TEID or CU described in person be to establish cell SRB0 distribution uplink TEID, the cell establish in response message comprising DU be to establish The downlink TEID or the DU of cell distribution are that the downlink TEID or the DU for the every kind of SRB distribution that establish cell are to want Establish the downlink TEID of the SRB0 distribution of cell；And/or
If the cell establish request message and/or the cell to establish response message sent by cell signaling connection, Then the cell establish request message and/or the cell to establish do not include cell ID in response message.
7. a kind of method for building up of ongoing interface characterized by comprising
DU sends F1 to CU and establishes request message；Wherein, the F1 establish in request message include one of following information or Multiple combinations: DU mark, the information list of the upper serving cell of DU, the ability information of DU, DU are the downlink of RRC information transmission distribution TEID；
The DU receives the F1 that the CU is sent and establishes response message；Wherein, it includes following letter in response message that the F1, which is established, One of breath or multiple combinations: CU mark, the PLMN identification list of CU support, cell configuration list, CU are RRC information transmission The uplink TEID of distribution.
8. a kind of method for building up of ongoing interface characterized by comprising
CU sends F1 and establishes request message to DU；Wherein, the F1 establish in request message include one of following information or Multiple combinations: CU is identified, information list, cell configuration list, the CU of the PLMN identification list of CU support, the upper serving cell of DU are The uplink TEID of RRC information transmission distribution；
The CU receives the F1 that the DU is sent and establishes response message；Wherein, it includes following letter in response message that the F1, which is established, One of breath or multiple combinations: DU mark, the ability information of DU, the actual disposition information of cell, DU are RRC information transmission point The downlink TEID matched.
9. a kind of method for building up of ongoing interface characterized by comprising
DU receives the F1 that CU is sent and establishes request message；Wherein, the F1 is established in request message including one in following information Kind or multiple combinations: PLMN identification list that CU mark, CU are supported, the information list of the upper serving cell of DU, cell configuration list, CU is the uplink TEID of RRC information transmission distribution；
The DU sends F1 to the CU and establishes response message；Wherein, it includes in following information that the F1, which is established in response message, One or more combinations: DU mark, the ability information of DU, the actual disposition information of cell, DU be RRC information transmission distribution Downlink TEID.
10. a kind of method for building up of ongoing interface characterized by comprising
CU sends F1 and establishes requirement message to DU；Wherein, the F1 establish in requirement message comprising one of following information or Multiple combinations: the information list of CU is identified, CU is supported PLMN identification list, the upper serving cell of DU；
The CU receives the F1 that the DU is sent and establishes request message；Wherein, it includes following letter in request message that the F1, which is established, One of breath or multiple combinations: DU mark, the information list of the upper serving cell of DU, the ability information of DU, DU are RRC information biography The downlink TEID of defeated distribution；
The CU sends F1 to the DU and establishes response message；Wherein, it includes in following information that the F1, which is established in response message, One or more combinations: CU support PLMN identification list, cell configuration list, CU be RRC information transmission distribution uplink TEID。
11. according to the method described in claim 10, it is characterized in that, when the F1 is established in requirement message comprising servicing on DU When the information list of cell, the F1 establishes in request message the information list for not including serving cell on the DU；And/or
When the F1 establishes the PLMN identification list comprising CU support in requirement message, the F1, which is established in response message, not to be wrapped The PLMN identification list supported containing the CU；And/or
When passing through user plane channel transfer when the system information between the CU and DU, the data in the user plane channel It include the scheduling information of system information in packet header, the data packet head is included in the expansion of GPRS Tunnel Protocol user face GTP-U In head；And/or
When the paging message between the CU and DU passes through user plane channel transfer, the data packet in the user plane channel Include one of following information or multiple combinations in head: needing to send the cell list or tracing area identity column of paging message The logical channel information that table, the discontinuous reception DRX of paging, priority, the paging message are sent, the data packet head include In the expansion head of GTP-U；And/or
When the application layer message of the DU updates, disappear this method comprises: the CU receives the DU configuration that the DU is sent and updates Breath includes the DU application layer message updated in the DU configuration update message；And/or
When the application layer message of the CU updates, this method comprises: the CU sends CU configuration update message to the DU, take With the CU application layer message updated.
12. according to the method for claim 11, which is characterized in that after the CU receives the DU application layer message updated, if Need to update system information, then the CU sends the scheduling of the system information of the system information and/or update that update to the DU Information.
13. a kind of method for building up of ongoing interface characterized by comprising
DU receives the F1 that CU is sent and establishes requirement message；Wherein, the F1 is established in requirement message comprising one in following information Kind or multiple combinations: the information list of CU is identified, CU is supported PLMN identification list, the upper serving cell of DU；
The DU sends F1 to the CU and establishes request message；Wherein, it includes in following information that the F1, which is established in request message, One or more combinations: DU mark, the information list of the upper serving cell of DU, the ability information of DU, DU be RRC information transmission point The downlink TEID matched；
The DU receives the F1 that the CU is sent and establishes response message；Wherein, it includes following letter in response message that the F1, which is established, One of breath or multiple combinations: PLMN identification list, cell configuration list, the CU of CU support are RRC information transmission distribution Uplink TEID.
14. a kind of cut-in method of UE characterized by comprising
DU in base station receives the RRC connection request message that UE is sent；
The RRC connection request message is sent to described by the DU by the user plane channel between the CU in base station CU；
The DU receives establishing UE context and being the request message of UE configured radio bearer for the CU transmission；Wherein, in institute State establish UE context and in the request message requests message of UE configured radio bearer comprising one of following information or more Kind combination: CU is that centralized unit user equipment access layer protocol-identifier CU UE AP ID, the DU of the UE distribution are the UE points Cell ID, the RB letter to be configured where distribution unit user equipment access layer protocol-identifier DU UE AP ID, the UE that match Breath, the configuration information of physical channel, the configuration information of transmission channel, the configuration information of logic channel, data feedback channel information；Its In, the data feedback channel information is the data feedback channel letter of RRC information transmission on other SRB in addition to SRB0 of CU distribution Breath；
The DU based on the received establish UE context and be the response message of UE configured radio bearer by information configuration resource, transmission Message is established to the CU, and by the RRC connection that CU described in the user plane channel reception is sent, and is transmitted to described UE；Wherein, it is described establish UE context and be UE configured radio bearer response message include CU be UE distribution CU UE AP ID, DU are the DU UE AP ID of UE distribution and/or are the RB information of UE configuration；
The DU receives the RRC connection setup complete message that the UE is sent, and is connected the RRC by the user plane channel It connects foundation to complete message sending to the CU, and includes the mark of the UE in the data packet head of relative users plane channel.
15. according to the method for claim 14, which is characterized in that after the DU sends the RRC connection completion message, This method further include:
When not needing to establish session, the DU is by CU described in control plane channel or user plane channel reception according to access The RRC information downlink Non-Access Stratum NAS that the downlink NAS of control and mobile management functional entity AMF transmit message and sends is transmitted, And it is transmitted to the UE；And/or
When needing to establish session, after the RRC connection setup complete message is sent to the CU by the DU, this method packet Include: the DU receives the CU and is reconfigured according to the radio bearer that the initial context of the AMF is established request message and sent Request message；It include one of following information or multiple combinations: CU UE in the radio bearer reconfiguration request message The RB letter that CU UE AP ID, the DU of distribution are DU UE AP ID of UE distribution, increased resource block RB information, to be reconfigured Breath, the RB information to be deleted；
Information distributes resource to the DU based on the received, sends radio bearer reconfiguration response message to the CU, and described One of following information or multiple combinations are carried in radio bearer reconfiguration response message: CU is the CU UE AP of UE distribution ID, DU are the configuration information of DU UE AP ID of UE distribution, RB；
The DU sets message by the RRC connection reconfiguration that CU described in the user plane channel reception is sent, and the RRC is connected It connects reconfiguration message and is transmitted to the UE, the RRC connection reconfiguration that the DU receives the UE transmission, which is set, completes message, and passes through institute State user plane channel by the RRC connection reconfiguration set complete message be transmitted to the CU.
16. method according to claim 14 or 15, which is characterized in that in the radio bearer configuring request that the CU is sent It include association identification in message, and include in the data packet head for carrying the user plane channel that message is established in the RRC connection With identical association identification in the radio bearer configuration request message；Alternatively, after the DU configures resource, DU reception Before request message is established in the RRC connection that the CU is sent, this method comprises: the DU sends radio bearer configuration to core net CN Response message, one of following information or multiple combinations are included in the radio bearer configuration response message: CU is described CU UE AP ID, the DU of UE distribution are DU UE AP ID of the UE distribution, are the RB information of the UE configuration；
And/or
When the RRC connection request message is sent to the CU by the user plane channel by the DU, when the use Family plane channel is marked in the data packet head in the user plane channel comprising UE when common on a DU and CU interface Knowledge, cell ID, TAI and/or SRB information；And/or when the user plane channel be when a cell is common, Include UE mark, the information of TAI and/or SRB in the data packet head in the user plane channel；And/or when the user plane When channel is each SRB in corresponding each cell, in the data packet head in the user plane channel comprising UE mark and/or TAI；And/or when only for SRB0 in each cell establishing user plane channel in F1 establishment process, the DU is by for SRB0 The user plane channel established sends the RRC information received from SRB0 to the CU；The number of relative users plane channel According to the information in packet header including UE mark and/or TAI；
And/or
It is established in message in the DU by the RRC connection of the user plane channel reception, when the user plane is logical Road is to include UE mark, cell in the data packet head in the user plane channel when common on a DU and CU interface Mark, the information of SRB and/or logical channel information；And/or when the user plane channel be when a cell is common, Comprising UE mark, the information of SRB and/or logical channel information in the data packet head in the user plane channel, the CU is logical It crosses in F1 establishment process and establishes message for the channel transmission RRC connection for RRC information transmission that respective cell is established； It is logical in the user plane and/or when the user plane channel is each SRB or when for SRB0 in corresponding each cell Comprising UE mark and/or logical channel information in the data packet head in road, the CU in F1 establishment process for respective cell by building The vertical user plane channel for RRC information transmission sends the RRC connection and establishes message；
And/or
When the DU sends RRC connection setup complete message or RRC reconfiguration to the CU by the user plane channel When setting completion message, when the user plane channel is when a cell is public, in the data packet of relative users plane channel It also include the information of SRB in head, alternatively, the CU is reconfigured by parsing the RRC connection setup complete message or the RRC Message is completed, determines the information of the SRB；And/or when the user plane channel is each SRB in corresponding each cell, The DU is according to receiving the RRC connection setup complete message or the RRC is reconfigured and completed the SRB of message, selection and the SRB RRC connection setup complete message described in the user plane channel transfer of correspondence establishment or the RRC are reconfigured and are completed message.
17. according to the method for claim 14, which is characterized in that the DU receives the CU hair by control plane channel The RRC information downlink NAS transmission sent includes: that the DU receives the RRC transmission message that the CU is sent, and the RRC transmits message In comprising CU be UE distribution CU UE AP ID, DU be UE distribution DU UE AP ID and/or downlink NAS transmission message；With/ Or,
When the DU passes through the RRC that CU described in the user plane channel reception on other SRB corresponded in addition to SRB0 is sent When message downstream NAS is transmitted, the DU receives the downlink that the CU is sent by GPRS Tunnel Protocol user face GTP-U NAS transmits message.
18. according to the method for claim 17, which is characterized in that when the corresponding use of RRC information on other described SRB It include the letter of SRB when the plane channel of family, in the data packet head in the user plane channel for sending the downlink NAS transmission message Breath；And/or
For the RRC information on other described SRB, if when the corresponding user plane channel each SRB, the CU with SRB The downlink NAS transmission message is sent on corresponding user plane channel, the DU transmits message according to the downlink NAS is received SRB, determine the operation for executing on corresponding SRB and sending downlink NAS transmission message.
19. according to the method for claim 18, which is characterized in that the DU passes through the hair of CU described in user plane channel reception When the RRC connection reconfiguration sent sets message, in the data packet head of relative users plane channel comprising UE mark and/or patrol Collect channel information；And/or
When the DU sets message by the RRC connection reconfiguration that CU described in user plane channel reception is sent,
If the user plane channel is that a corresponding cell is public, believe in the data packet head in the user plane channel comprising SRB Breath；And/or if the user plane channel is corresponding each SRB, the CU utilizes user plane corresponding with corresponding SRB Channel sends the RRC connection reconfiguration and sets message, and the DU sets the SRB of message according to the RRC connection reconfiguration is received, at this The operation that the transmission RRC connection reconfiguration sets message is executed on SRB.
20. a kind of cut-in method of UE characterized by comprising
CU in base station is disappeared by the RRC connection request that DU described in the user plane channel reception between DU in base station is forwarded from UE Breath；
The CU is the CU UE AP ID that UE is distributed on F1 interface, and establishes UE context to DU transmission and configure for UE The request message of radio bearer；
The CU establishes UE context by the user plane channel reception and is the response message of UE configured radio bearer, leads to It crosses the user plane channel and establishes message to DU transmission RRC connection, and by described in the user plane channel reception DU is forwarded from the RRC connection setup complete message of the UE, logical in the user plane for carrying RRC connection setup complete message It include the mark of the UE in the data packet head in road；The CU sends initial UE message to AMF.
21. according to the method for claim 20, which is characterized in that after the CU sends initial UE message to AMF, the party Method includes:
When not needing to establish session, the CU receives the downlink NAS that AMF is sent and transmits message, and passes through control plane channel Or user plane channel sends RRC information downlink NAS transmission to the DU；And/or
When needing to establish session, after the CU receives the RRC connection setup complete message, this method comprises: the CU It receives the initial context that the AMF is sent and establishes request message, and send radio bearer reconfiguration request message to the DU； Include one of following information or multiple combinations in the radio bearer reconfiguration request message: CU is the CU of UE distribution UE AP ID, DU be UE distribution DU UE AP ID, want increased RB information, to be reconfigured RB information, to be deleted RB letter Breath；
The CU receives the DU and completes the radio bearer reconfiguration response message sent after resource allocation；Wherein, described wireless One of following information or multiple combinations are carried in carrying reconfiguration response message: CU is CU UE AP ID, the DU of UE distribution The configuration information of DU UE AP ID, RB that are distributed for UE；
The CU sends RRC connection reconfiguration to the DU by the user plane channel and sets message, and flat by the user The RRC connection reconfiguration that DU described in the channel reception of face is forwarded from the UE, which is set, completes message.
22. a kind of switching method of UE, which is characterized in that for switching between the different DU of the same CU, this method comprises:
The difference DU includes source DU and purpose DU, and the CU of base station is measured by the user plane channel reception between the source DU Report message；The measurement report message is the measurement report message that UE issues base station；
After the CU determination switches over UE, the request established UE context and be UE configured radio bearer is sent to purpose DU Message；Wherein, it is described establish UE context and for the request message of UE configured radio bearer include one of following information or Multiple combinations: CU is CU UE AP ID, the UE contextual information, purpose cell ID, the RB to be configured in S-DU of UE distribution Information, the configuration information of physical channel, the configuration information of transmission channel, the configuration information of logic channel, data feedback channel information, The instruction of MBB switching；
The CU receives establishing UE context and being the response message of UE configured radio bearer for the purpose DU transmission；Described Establish UE context and be UE configured radio bearer response message in include one of following information or multiple combinations: CU is CU UE AP ID, the purpose DU of UE distribution are DU UE AP ID of UE distribution, are the RB information of UE configuration；
The CU sends RRC connection reconfiguration by the user plane channel and sets message to the source DU, and by the source DU and The instruction of the information and/or MBB that switch between the purpose DU is sent to the source DU；
The CU sends data to the purpose DU, and after UE is synchronized to purpose cell, the CU receives the purpose DU and passes through The RRC connection setup complete message that user plane channel is sent；The RRC connection setup complete message is that the UE is sent to institute State base station；
The CU sends UE context release message to the source DU.
23. according to the method for claim 22, which is characterized in that the CU by the information switched between different DU and/or The instruction of MBB be sent to the source DU include: the CU by F1AP message send the information switched between the difference DU and/ Or the instruction of MBB, connect alternatively, the instruction of the information switched between different DU and/or MBB are included in and are used to carry the RRC It connects and is sent to the source DU in the data packet head in the user plane channel of reconfiguration message；And/or
When it is described be switched to MBB switching when, this method comprises: the CU determines to stop sending downlink data or stopping and UE communication Time, and notify the source DU.
24. according to the method for claim 23, which is characterized in that when the information and/or MBB switched between the difference DU Instruction when including in the data packet head in user plane channel, which further includes the CU UE AP that CU is UE distribution ID, S-DU are the DU UE AP ID of UE distribution and/or send the logical channel information that the RRC connection reconfiguration sets message.
25. according to method described in claim 22,23 or 24, which is characterized in that the CU sends data to the purpose DU Include:
It is that the CU directly not confirms the UE and be sent to the purpose DU from the data that UPF is received；Alternatively,
When purpose DU and source DU have identical RB configuration, the CU receives the first message that the source DU is sent；
Wherein, the first message include: CU be UE distribution CU UE AP ID, source DU be UE distribution DU UE AP ID, RLC sends state and/or PDCP transmits and receives state；Wherein, it includes that the last one is successfully transmitted GTP- that the RLC, which sends state, The SN of U data packet, the failed SN for sending GTP-U data packet and the RLC SN, the PDCP sent not successfully send state packet Reception containing the last one SN, failed transmission GTP-U data packet SN and/or uplink PDCP that are successfully transmitted GTP-U data packet State.
26. according to the method for claim 25, which is characterized in that when do not include in the first message PDCP transmit and receive When state, after the CU receives the first message, this method further include: the CU sends second message to the purpose DU；
Wherein, it is the DU UE AP ID of UE distribution that the second message, which includes: CU UE AP ID, source DU that CU is UE distribution, And/or RLC sends state.
27. a kind of switching method of UE, which is characterized in that for switching between the different DU of the same CU, this method comprises:
What the CU that the purpose DU of switching described in base station receives base station was sent establishes UE context and is UE configured radio bearer Request message；Wherein, described to establish UE context and include one in following information for the request message of UE configured radio bearer Kind or multiple combinations: CU be UE distribution CU UE AP ID, UE in the contextual information of S-DU, purpose cell ID, to configure RB information, the configuration information of physical channel, the configuration information of transmission channel, the configuration information of logic channel, data feedback channel letter The instruction that breath, MBB switch；
The purpose DU sends the response message established UE context and be UE configured radio bearer to the CU；In the foundation UE context and be UE configured radio bearer response message in include one of following information or multiple combinations: CU is UE points CU UE AP ID, the purpose DU matched is DU UE AP ID of UE distribution, is the RB information of UE configuration；
The purpose DU receives the data that the CU is sent, and after UE is synchronized to purpose cell, the purpose DU receives the UE The RRC connection setup complete message of transmission, and forward the RRC to connect to the CU by the user plane channel between the CU It connects foundation and completes message.
28. a kind of DU device for UE access, which is characterized in that the device includes: that receiving unit, transmission unit and processing are single Member；
The receiving unit, for receiving the RRC connection request message of user terminal UE transmission；
The transmission unit, for by the user plane channel between the CU in base station by the RRC connection request message It is sent to the CU；
The processing unit establishes UE context and disappears for the request of UE configured radio bearer for receive that the CU sends Breath, information configuration resource, sends and establishes UE context and be the response message of UE configured radio bearer to described based on the received CU, and message is established by the RRC connection that CU described in the user plane channel reception is sent, and be transmitted to the UE；Also use In the RRC connection setup complete message for receiving the UE transmission, the RRC connection has been established by the user plane channel It is sent to the CU at message, and includes the mark of the UE in the data packet head of relative users plane channel；It is also used to When not needing to establish session, transmitted by CU described in control plane channel or user plane channel reception according to the downlink NAS of AMF Message and the RRC information downlink NAS transmission sent, and are transmitted to the UE；
Wherein, it is described establish UE context and in the request message of UE configured radio bearer one of comprising following information Or multiple combinations: where CU is DU UE AP ID, the UE that CU UE AP ID, the DU of the UE distribution are the UE distribution The configuration of cell ID, the RB information to be configured, the configuration information of physical channel, the configuration information of transmission channel, logic channel Information, data feedback channel information；The data feedback channel information is the RRC information on other SRB in addition to SRB0 of CU distribution The data feedback channel information of transmission；It is described establish UE context and be UE configured radio bearer response message include CU be UE distribution CU UE AP ID, DU be UE distribution DU UE AP ID and/or be UE configuration RB information；.
29. a kind of CU device for UE switching, which is characterized in that the device includes: transmission unit, processing unit and receives single Member；
The receiving unit, for issuing the measurement report of base station by the user plane channel reception UE between source DU in base station Message；
The processing unit after switching over for determination to UE, establishes UE context to purpose DU transmission and configures nothing for UE The request message of line carrying；It is also used to receive establishing UE context and being the sound of UE configured radio bearer for the purpose DU transmission Answer message；Be also used to by the user plane channel send RRC connection reconfiguration set message to the source DU, and by different DU it Between the instruction of information and/or MBB that switches be sent to the source DU；It is also used to send data to the purpose DU, it is synchronous in UE To after purpose cell, the RRC connection setup complete message that the purpose DU is sent by user plane channel is received；Wherein, institute Stating RRC connection setup complete message is that the UE is sent to the base station；
The transmission unit, for sending UE context release message to the source DU；
Wherein, described to establish UE context and include one of following information for the request message of UE configured radio bearer or more Kind combination: CU is CU UE AP ID, the UE of UE distribution in the contextual information of S-DU, purpose cell ID, the RB letter to be configured Breath, the configuration information of physical channel, the configuration information of transmission channel, the configuration information of logic channel, data feedback channel information, MBB The instruction of switching；It is described establish UE context and for UE configured radio bearer response message in include following information in one Kind or multiple combinations: CU is that CU UE AP ID, the purpose DU of UE distribution are DU UE AP ID of UE distribution, are the RB of UE configuration Information.
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