CN109246747A

CN109246747A - Method for building up, UE access method, UE switching method and the device of ongoing interface

Info

Publication number: CN109246747A
Application number: CN201710458428.4A
Authority: CN
Inventors: 许丽香; 王弘; 柯小婉; 汪巍崴
Original assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Current assignee: Beijing Samsung Telecom R&D Center; Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Priority date: 2017-05-05
Filing date: 2017-06-16
Publication date: 2019-01-18
Anticipated expiration: 2037-06-16
Also published as: CN113163440A; CN109246747B; CN113163440B

Abstract

This application discloses a kind of UE access methods, comprising: DU receives radio resource control RRC connection request message from UE；The DU is by the user plane channel between CU or controls plane channel to CU transmission initial UE message transmission message；The DU receives radio bearer configuration request message from CU；DU information configuration resource based on the received, and radio bearer configuration response message is sent to CU；The DU receives downlink RRC from the CU and transmits message；The RRC received connection is established message and is transmitted to the UE by the DU；The DU receives RRC connection setup complete message from the UE；The RRC connection setup complete message received is sent to CU by control plane or user plane by the DU.Using technical solution disclosed in the present application, better intercommunication between DU and CU, the configuration for reducing operator can be realized.

Description

Method for building up, UE access method, UE switching method and the device of ongoing interface

Technical field

This application involves wireless communication techniques, the in particular to method for building up of ongoing interface, UE access method, the switching side UE 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.

It is Radio Access Network that Next-Generation, which enters network (NG-RAN) 102, wireless including access is provided for UE The base station (gNB or the eNB for being connected to 5G core net (5GC)) of network interface.

Access control and mobile management functional entity (AMF) 103 are responsible for the mobile context and security information of management UE.

User-plane function entity (UPF) 104 mainly provides the function of user plane.

The responsible session management of conversation management functional entity (SMF) 105.

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 are realized, the gNB in 5G can be further It is divided into centralized unit (gNB-CU) and distribution unit (gNB-DU).Hereinafter referred to as CU and DU in the present invention.Packet data convergence Agreement (PDCP) and the function of wireless heterogeneous networks (RRC) are in CU.RLC (wireless spread-spectrum technology), MAC (media access control) and The function of physical 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, increased on IP Flow Control Transmission Protocol (SCTP) agreement.The application layer protocol of F1 interface is F1AP.SCTP can provide reliable application layer and disappear Breath transmission.The transport layer of F1-U is user datagram protocol/the Internet protocol (UDP/IP), GPRS Tunnel Protocol user face (GTP-U) for carrying user-plane protocol data cell (PDU) on UDP/IP.

It can be seen from the prior art that the framework of 5G and LTE are different, to connecing before inside of base station needs support in 5G Mouthful.UE access, call setup and switching etc. how are supported in F1 interface, are discussed there is presently no specific.

Summary of the invention

This application provides the method for building up of several ongoing interfaces, UE access method, UE switching and communication means and device, To realize better intercommunication between DU and CU.

This application provides a kind of method for building up of ongoing interface, comprising:

Base station centralized unit CU receives ongoing interface F1 from base station distribution cells D U and establishes request message；

The CU sends F1 to the DU and establishes response message.

Preferably, it includes one of following information or multiple combinations in request message that the F1, which is established: in DU mark, DU The ability information of the information list of serving cell, DU；

It includes one of following information or multiple combinations in response message that the F1, which is established: the public affairs that CU mark, CU are supported Land mobile communication network network PLMN identification list, cell configuration list altogether.

Preferably, the information of serving cell includes one of following information in the information list of serving cell on the DU Or multiple combinations: cell ID, the frequency information of cell, uplink bandwidth, downstream transmission bandwidth information, physical area mark Know, tracing area mark TAI or Tracking Area Code TAC, the PLMN identification list of broadcast, transmission receiving point TRP information, wave beam Physic channel information in Beam information, the cell, transmitting channel information in the cell, logic channel letter in the cell The cell access layer AP for F1 interface that breath, the DU are distributed is identified；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, when it includes the ability information of DU in request message that the F1, which is established, this method comprises: the CU is utilized The ability information scheduling user terminal UE of the DU.

Preferably, sending F1 when F1 is established and do not included cell configuration list in response message to the DU in CU and establishing After response message, this method comprises:

CU sends cell and establishes request message to DU, and establishes the carrying cell to be configured in request message in the cell Community configured information；The CU receives the cell that the DU is sent and establishes response message；

Wherein, the community configured information includes one of following information or multiple combinations: cell ID, the cell The configuration information of middle common signal channel, the system information in the cell, the scheduling information of system information transmission, the CU points The cell AP for F1 interface matched is identified.

Preferably, if the cell establish request message and/or the cell to establish response message be by cell signaling What connection was sent, then the cell establish request message and/or the cell to establish do not include cell ID in response message.

Preferably, when not including system information and/or system letter in the cell in the community configured information When ceasing the scheduling information sent, this method comprises: one or more cells of the CU correspondence establishment, send system information transmissions Message give the DU, and in the system information transmissions message comprising cell ID, the system information in the cell and/or The scheduling information that the system information is sent.

Present invention also provides a kind of method for building up of ongoing interface, comprising:

DU sends F1 to CU and establishes request message；

The DU receives F1 from the CU and establishes response message.

It includes one of following information or multiple combinations in response message that the F1, which is established: CU mark, CU are supported PLMN identification list, cell configuration list.

Present invention also provides a kind of CU devices established for ongoing interface, which includes: transmission unit and reception Unit；

The receiving unit establishes request message for receiving F1 from DU；Wherein, the F1, which is established in request message, includes One of following information or multiple combinations: DU mark, the ability information of the information list of the upper serving cell of DU, DU；

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, the cell configuration list that CU mark, CU are supported.

Present invention also provides a kind of DU devices established for ongoing interface, which is characterized in that the device includes: to send 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 ability information of the information list of the upper serving cell of DU, DU；

The receiving unit establishes response message for receiving F1 from the CU；Wherein, the F1 is established in response message Including one of following information or multiple combinations: PLMN identification list, the cell configuration list that CU mark, CU are supported.

CU sends F1 and establishes request message to DU；

The CU receives F1 from the DU and establishes response message.

Preferably, it includes one of following information or multiple combinations in request message that the F1, which is established: CU mark, CU branch Information list, the cell configuration list for the upper serving cell of PLMN identification list, DU held；

It includes one of following information or multiple combinations in response message that the F1, which is established: DU mark, the ability of DU letter The actual disposition information of breath, cell.

DU receives F1 from CU and establishes request message；

The DU sends F1 to the CU and establishes response message.

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；

The receiving unit establishes response message for receiving F1 from the DU；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.

Present invention also provides a kind of DU devices established for ongoing interface, which includes: transmission unit and reception Unit；

The receiving unit establishes request message to DU for receiving F1 from CU；Wherein, the F1 is established in request message Including one of following information or multiple combinations: CU mark, the information of the PLMN identification list that CU is supported, the upper serving cell of DU List, cell configuration list；

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.

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 F1 from the DU 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 ability information of the information list of the upper serving cell of DU, DU；

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, the cell configuration list of CU support.

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.

DU receives F1 from CU and establishes requirement message；

The DU sends F1 to the CU and establishes request message；

The DU receives the F1 that the CU is sent and establishes response message.

Preferably, the F1 is established in requirement message comprising one of following information or multiple combinations: CU mark, CU branch The information list for the upper serving cell of PLMN identification list, DU held；

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 ability information of the information list in area, DU；

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.

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 F1 from the DU；

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；

The receiving unit establishes requirement message for receiving F1 from CU；Described in being also used to send in the transmission unit After F1 establishes request message, F1 is received from the CU and establishes response message；

The transmission unit establishes request message for sending F1 to the CU；

Present invention also provides a kind of UE access methods, comprising:

DU receives radio resource control RRC connection request message from UE；

The DU sends initial UE message transmission to CU by user plane channel between CU or control plane channel and disappears Breath；

The DU receives radio bearer configuration request message from CU；

DU information configuration resource based on the received, and send radio bearer configuration response message and give centralized unit CU；

The DU receives downlink RRC from the CU and transmits message；

The RRC received connection is established message and is transmitted to the UE by the DU；

The DU receives RRC connection setup complete message from the UE；

The RRC connection setup complete message received is sent to CU by control plane or user plane by the DU.

Preferably, including one of following information or multiple combinations in the initial UE message transmission message: DU is institute Distribution unit user equipment access layer protocol-identifier DU UE AP ID, the DU for stating UE distribution receive the RRC connection request message The cell ID of cell, TAI, the RRC connection request message, the Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C- that DU is UE distribution RNTI；

And/or include one of following information or multiple combinations in the radio bearer configuration request message: CU is institute CU UE AP ID, the DU for stating UE distribution are cell ID where DU UE AP ID, the UE of UE distribution, to be configured Radio bearer RB information, the configuration information of physical channel, the configuration information of transmission channel, the configuration information of logic channel, uplink Channel information；

And/or the radio bearer configuration response message includes one or more combinations of following information: CU is described CU UE AP ID, the DU of UE distribution are DU UE AP ID of UE distribution, the RB information for being UE configuration, DU are what UE was distributed C-RNTI；

And/or the downlink RRC transmission message includes one or more combinations of following information: CU is the UE points CU UE AP ID, the DU matched is DU UE AP ID of UE distribution, message is established in RRC connection, sends RRC information Logical channel information, data feedback channel information, the C-RNTI that CU is UE distribution；

And/or DU is when being sent to CU for RRC connection setup complete message, by one or more combinations of following information It is sent to the DU UE AP ID that CU UE AP ID, the DU that the CU:CU is the UE distribution are the UE distribution.

Preferably, when not needing to establish session, the DU is by control plane channel or user plane channel from described CU receives access control and the downlink Non-Access Stratum NAS of mobile management functional entity AMF transmission transmits message, and is transmitted to described UE；

When needing to establish session, the DU receives radio bearer reconfiguration request message from the CU, described wirelessly to hold Load-carrying configuration request message includes one or more combinations of following information: CU is CU UE AP ID, the DU UE of UE distribution DU UE AP ID of distribution, the RB information increased RB information, being reconfigured, the RB information to be deleted；DU distributes resource, And radio bearer reconfiguration response message is sent to CU, the radio bearer reconfiguration response message includes one kind of following information Or a variety of combination: CU is that CU UE AP ID, the DU of UE distribution are the configuration information of DU UE AP ID of UE distribution, RB；DU RRC connection reconfiguration is received from CU and sets message, and is sent to UE；The RRC connection reconfiguration that UE is sent is set completion message and passes through control by DU Plane processed or user plane are sent to CU.

Preferably, the RRC information between DU and CU passes through control planar transmission, alternatively, on Signaling Radio Bearer SRB0 RRC information passes through user-plane transmissions by controlling planar transmission, the RRC information on other SRB；

The user plane channel of transmission RRC information is established between DU and CU by following three kinds of modes:

When mode one: DU receives RRC connection request message from UE, the channel information of DU allocation of downlink, and pass through initial UE The down going channel information of distribution is sent to CU after CU distributes the channel information of uplink and passes through radio bearer by message transmission message It configures message and the data feedback channel information of distribution is sent to DU；The channel information of the downlink and the channel information of uplink include logical Road identifies TEID and/or transport Layer address.

When mode two: DU receives RRC connection request message from UE, the channel information of DU allocation of downlink is disappeared by initial UE The down going channel information of distribution is sent to CU by breath transmission message, after DU sends radio bearer configuration response message to CU, CU The channel information for distributing uplink transmits message by downlink RRC and the data feedback channel information of distribution is sent to DU；The downlink Channel information and the channel information of uplink include gap marker TEID and/or transport Layer address.

After mode three: DU sends initial UE message transmission message to CU, CU distributes the channel information of uplink, by wirelessly holding It carries configuration message and the data feedback channel information of distribution is sent to DU, the channel information of DU allocation of downlink is configured by radio bearer The down going channel information of distribution is sent to CU by response message；The channel information of the downlink and the channel information of uplink include logical Road identifies TEID and/or transport Layer address；

By controlling planar transmission, the RRC information on other SRB passes through user plane and passes RRC information on corresponding SRB0 Defeated mode, the RRC information on other SRB is by the same user plane channel transfer, alternatively, each corresponding SRB is established One user plane channel, is transmitted respectively, correspondingly, the upstream or downstream channel information distributed be it is corresponding each SRB's.

Preferably, described want one or more combinations of the increased RB information comprising following information: 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 data feedback channel information of the QoS flow Flow information and/or the RB that map on RB；The QoS Flow information mapped on the RB Include flow mark, the corresponding Qos information of flow；

And/or the data feedback channel information includes transport Layer address and uplink TEID；

And/or the RB information to be reconfigured includes one or more combinations of following information: RB is identified, is described The reconfiguration information of the physical channel of RB, the reconfiguration information of the transmission channel of the RB, the RB logic channel reconfiguration Confidence breath is wanted on the RB on increased QoS Flow information, the Qos flow information to be deleted on the RB and/or the RB The Qos flow information to be transmitted.It includes Qos flow mark, Qos flow that increased QoS Flow information is wanted on the RB Qos information；The Qos parameter that the QoS Flow information to be reconfigured on the RB includes Qos flow mark, to be reconfigured；It is described The upper QoS Flow information to be deleted of RB is identified comprising Qos flow.

Present invention also provides the cut-in methods of UE a kind of, comprising:

CU, which by user plane channel between DU or control plane channel receives the DU and is forwarded from the RRC of UE, to be connect and asks Seek message；

The CU sends radio bearer configuration request message to the DU；Wherein, disappear in the radio bearer configuring request Include one of following information or multiple combinations in breath: CU is that CU UE AP ID, the DU of the UE distribution are the UE distribution DU UE AP ID, the UE where cell ID, the RB information to be configured, the configuration information of physical channel, transmission channel Configuration information, the configuration information of logic channel, data feedback channel information；

The CU is sent RRC and connect to establish by user plane channel between DU or control plane channel to the DU to disappear Breath, and the DU received by user plane channel between DU or control plane channel be forwarded from the RRC of the UE and connect and build It is vertical to complete message；

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 send RRC information downlink NAS to the DU and transmit；

When needing to establish session, the CU receives initial context from AMF and establishes request message, and sends wirelessly to DU Reconfiguration request message is carried, the radio bearer reconfiguration request message includes one or more combinations of following information: CU is the RB letter that CU UE AP ID, the DU of UE distribution are DU UE AP ID of UE distribution, increased RB information, to be reconfigured Breath, the RB information to be deleted；Radio bearer reconfiguration response message, the radio bearer reconfiguration response message packet are received from DU One or more combinations containing following information: CU be UE distribution CU UE AP ID, DU be UE distribution DU UE AP ID, The configuration information of RB；RRC connection reconfiguration is sent to DU and sets message, and the RRC connection reconfiguration for receiving the UE transmission of DU forwarding sets completion Message.

Present invention also provides a kind of DU device for UE access, which includes: receiving unit, transmission unit and place Manage unit；

The receiving unit, for receiving the RRC connection request message of user terminal UE transmission；

The transmission unit, for being connected the RRC by user plane channel between CU or control plane channel It connects request message and is sent to the CU；

The processing unit, the radio bearer configuration request message sent for receiving the CU, based on the received information Resource is configured, and the RRC connection that the CU is sent is received by the user plane channel or control plane channel and establishes message, And it is transmitted to the UE；It is also used to receive the RRC connection setup complete message that the UE is sent, passes through the user plane channel Or the RRC connection setup complete message is sent to the CU by control plane channel, and in relative users plane channel or control It include the mark of the UE in the data packet head of plane channel processed；It is also used to when not needing to establish session, by controlling plane The RRC information downlink NAS that CU described in channel or user plane channel reception transmits message according to the downlink NAS of AMF and sends is passed It is defeated, and it is transmitted to the UE；

Wherein, including one of following information or multiple combinations in the radio bearer configuration request message: CU is CU UE AP ID, the DU of the UE distribution are cell ID where DU UE AP ID, the UE of UE distribution, 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 Breath.

Present invention also provides a kind of CU device for UE access, which includes: receiving unit, transmission unit and place Manage unit；

The receiving unit is forwarded for receiving the DU by user plane channel between DU or control plane channel From the RRC connection request message of UE；

The transmission unit, for sending radio bearer configuration request message to the DU；Wherein, in the radio bearer Include one of following information or multiple combinations in configuration request message: CU is that CU UE AP ID, the DU of the UE distribution are Cell ID where DU UE AP ID, the UE of UE distribution, the RB information to be configured, physical channel configuration information, The configuration information of transmission channel, the configuration information of logic channel, data feedback channel information；

The processing unit connects for sending RRC to the DU by the user plane channel or control plane channel It connects and establishes message, and the RRC company that the DU is forwarded from the UE is received by the user plane channel or control plane channel It connects foundation and completes message, the number in user plane channel or control plane channel for carrying RRC connection setup complete message According to the mark in packet header including the UE；It is also used to when not needing to establish session, receives the downlink NAS transmission that AMF is sent and disappear Breath, and RRC information downlink NAS transmission is sent to the DU by control plane channel or user plane channel.

Present invention also provides the switching method of UE a kind of, the source DU and purpose DU of the switching correspond to the same CU, should Method includes:

CU, which by user plane channel between the DU of source or control plane channel receives UE and issues the measurement report of base station, to disappear Breath；

After the CU determination switches over UE, radio bearer is sent to purpose DU and configures message；Wherein, described wirelessly to hold Carrying configuration message includes one of following information or multiple combinations: CU is CU UE AP ID, the UE of UE distribution in the upper of S-DU Context information, purpose cell ID, the RB information to be configured, the configuration information of physical channel, transmission channel configuration information, patrol Collect the instruction that configuration information, data feedback channel information, the MBB of channel switch；

The CU receives the radio bearer configuration response message that the purpose DU is sent；In the radio bearer configuration response Include one of following information or multiple combinations in message: CU is that CU UE AP ID, the purpose DU of UE distribution are what UE was distributed DU UE AP ID, the RB information configured for UE；

The CU sends RRC connection reconfiguration by the user plane channel or control plane channel and 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；

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 or control plane channel；The RRC connection, which is established, to be completed to disappear Breath is that the UE is sent to the base station；

The CU sends UE context release message to the source DU.

Preferably, the RRC information between DU and CU passes through control planar transmission, alternatively, on Signaling Radio Bearer SRB0 RRC information passes through user-plane transmissions by controlling planar transmission, the RRC information on other SRB.

Preferably, the RRC information on corresponding SRB0 passes through user by controlling planar transmission, the RRC information on other SRB The mode of planar transmission, RRC information on other SRB by the same user plane channel transfer, alternatively, it is corresponding each SRB establishes a user plane channel, is transmitted respectively, correspondingly, the upstream or downstream channel information distributed is corresponding Each SRB's.

Preferably, each corresponding DRB, the radio bearer configuration message includes the data feedback channel information of CU distribution；It is right Should other RRC informations in addition to SRB0 by the method for user-plane transmissions, it is SRB that the radio bearer configuration message, which includes CU, The data feedback channel information of distribution, the communication information is corresponding each SRB or RRC information passes on all SRB other than SRB0 Defeated common channel；The data feedback channel information includes transport Layer address and TEID；

And/or the RB information for UE configuration includes the configuration information of SRB and DRB；Each corresponding DRB, it is described to disappear Down going channel information of the breath comprising T-DU distribution；Method of other RRC informations in addition to SRB0 by user-plane transmissions is corresponded to, The message includes the down going channel information that T-DU is SRB distribution, and the communication information is corresponding each SRB or in addition to SRB0 RRC information transmits common channel on outer all SRB；The channel information includes transport Layer address and TEID.

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 not confirms the UE and be sent to the purpose DU, the data from the data that UPF is received It is PDCP PDU；Alternatively,

If T-DU and S-DU have identical RB to configure, number that is that the CU not confirms the UE and receiving from UPF According to the purpose DU is sent to, the data are PDCP PDU, and the RLC context of source is sent to purpose DU by source DU；It is corresponding The PDCP PDU that is successfully transmitted of part, purpose DU only send RLC PDU that UE is not received to UE；The CU receives the source DU One message of RLC context transfer of transmission；The CU sends two message of RLC context transfer to the purpose DU；

It include: that CU distributes for UE in one message of RLC context transfer and two message of RLC context transfer CU UE AP ID, source DU are that DU UE AP ID, the RLC of UE distribution send state and/or PDCP transmits and receives state；Wherein, It includes that the last one is successfully transmitted the SN of GTP-U data packet, the failed SN for sending GTP-U data packet that the RLC, which sends state, And/or the RLC SN sent not successfully.

Source DU receives measurement report message from UE, and the source DU is logical by user plane channel between CU or control plane Road sends the measurement report message to the CU；

The source DU receives the RRC connection reconfiguration that the CU is sent by the user plane channel or control plane channel Message is set, 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.

Present invention also provides a kind of CU device for UE switching, which includes: transmission unit, processing unit and connects Receive unit；

The receiving unit issues base for receiving UE by user plane channel between the DU of source or control plane channel The measurement report message stood；

The 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 flat by the user plane channel or control Face channel sends RRC connection reconfiguration and sets message to the source DU, and by the instruction of the information and/or MBB that switch between different DU It is 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 The RRC connection setup complete message sent by user plane channel；Wherein, the RRC connection setup complete message is described UE is sent to the base station；

The transmission unit, for sending UE context release message to the source DU；

Wherein, the radio bearer configuration message includes one of following information or multiple combinations: CU is UE distribution CU UE AP ID, UE the contextual information of S-DU, purpose cell ID, the RB information to be configured, physical channel match confidence The instruction that breath, the configuration information of transmission channel, the configuration information of logic channel, data feedback channel information, MBB switch；In the nothing It includes one of following information or multiple combinations in configuration response message that line, which carries: CU is CU UE AP ID of UE distribution, mesh DU be UE distribution DU UE AP ID, be UE configuration RB information.

Present invention also provides a kind of source DU device for UE switching, which includes: first processing units, at second Manage unit and third processing unit；

The first processing units, for receive user terminal UE transmission measurement report message, be also used to by with CU Between user plane channel or control plane channel to the CU send the measurement report message；

Described the second processing unit is sent for receiving the CU by the user plane channel or control plane channel RRC connection reconfiguration set message, and receive 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.

Present invention also provides a kind of purpose DU devices for UE switching, which includes: first processing units, second Processing unit and third processing unit；

First processing units, the radio bearer that the CU for receiving base station is sent configure message；Wherein, the radio bearer Configuring message includes one of following information or multiple combinations: CU is CU UE AP ID, the UE of UE distribution above and below S-DU Literary information, purpose cell ID, the RB information to be configured, the configuration information of physical channel, the configuration information of transmission channel, logic The instruction that configuration information, data feedback channel information, the MBB of channel switch；

Described the second processing unit, for sending radio bearer configuration response message to the CU；In the radio bearer Include one of following information or multiple combinations in configuration response message: CU is that CU UE AP ID, the purpose DU of UE distribution are DU UE AP ID of UE distribution, the RB information configured for UE；

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.

Present invention also provides the cut-in method of UE a kind of, the UE is accessed by DU-1 and DU-2, the DU-1 and DU- The 2 corresponding same CU, this method comprises:

After a part of DRB or all DRB of UE are switched to purpose DU by the CU determination, wirelessly held to purpose DU transmission Carry configuration message；Wherein, the radio bearer configuration message includes one of following information or multiple combinations: CU is UE distribution CU UE AP ID, UE in the contextual information of source DU, purpose cell ID, the RB information to be configured in purpose DU, physics letter The finger that the configuration information in road, the configuration information of transmission channel, the configuration information of logic channel, data feedback channel information, MBB switch Show；Wherein, each corresponding DRB, the radio bearer configuration message include the data feedback channel information of CU distribution；The channel letter Breath includes transport Layer address and TEID；

The CU sends RRC connection reconfiguration by the user plane channel or control plane channel and sets message to the source DU, one or more combinations of following information, which are sent to CU UE AP ID, DU-1 that the source DU:CU is UE distribution, is DU UE AP ID of UE distribution, the RRC connection reconfiguration set, the logical channel information that sends RRC information, to switch the RB walked Information, MBB switching instruction；

The CU sends UE context release message to the source DU.

Present invention also provides a kind of CU device for UE access, which includes: receiving unit, processing unit and hair Send unit, in which:

The processing unit passes through hair after a part of DRB or all DRB of UE are switched to purpose DU for determination Unit is sent to send radio bearer configuration message to purpose DU；Wherein, the radio bearer configuration message includes in following information One or more combinations: CU be UE distribution CU UE AP ID, UE in the contextual information of source DU, purpose cell ID, in mesh DU to be configured RB information, the configuration information of physical channel, the configuration information of transmission channel, logic channel configuration information, The instruction that data feedback channel information, MBB switch；Wherein, each corresponding DRB, the radio bearer configuration message are distributed comprising CU Data feedback channel information；The channel information includes transport Layer address and TEID；

The receiving unit is also used to receive the radio bearer configuration response message that the purpose DU is sent；In the nothing It includes one of following information or multiple combinations in configuration response message that line, which carries: CU is CU UE AP ID of UE distribution, mesh DU be UE distribution DU UE AP ID, be UE configuration RB information；

The transmission unit is also used to send RRC connection reconfiguration by the user plane channel or control plane channel Message is set to the source DU, one or more combinations of following information are sent to the CU UE that the source DU:CU is UE distribution AP ID, DU-1 are DU UE AP ID of UE distribution, the RRC connection reconfiguration is set, the logical channel information that sends RRC information, Switch the information of the RB walked, the instruction of MBB switching；

The transmission unit is also used to send data to the purpose DU, and after UE is synchronized to purpose cell, the CU is connect Receive the RRC connection setup complete message that the purpose DU is sent by user plane channel or control plane channel；The RRC connects Connecing foundation and completing message is that the UE is sent to the base station；And UE context release message is sent to the source DU.

As seen from the above technical solution, pass through ongoing interface method for building up provided by the present application, it is possible to reduce operator Configuration guarantees better intercommunication between DU and CU.In addition, switching method and cut-in method of the UE provided by the invention in F1 interface And its device, it ensure that interconnecting between can supporting multi-vendor equipment between DU and CU.

Detailed description of the invention

Fig. 1 is the system architecture diagram of 5G network；

Fig. 2 is one schematic diagram of method for building up of ongoing interface of the present invention；

Fig. 3 is two schematic diagram of method for building up of ongoing interface of the present invention；

Fig. 4 is three schematic diagram of method for building up of ongoing interface of the present invention；

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；

The method schematic diagram that Fig. 7 UE of the present invention is accessed by the different DU of the same CU.

Specific embodiment

It is right hereinafter, referring to the drawings and the embodiments, for the objects, technical solutions and advantages of the application are more clearly understood The application is described in further detail.

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.

Embodiment one:

The method for building up one of ongoing interface of the present invention is as shown in Figure 2.F1 interface establishment process is initiated by DU in this method.It should Method can be used for O&M and CU and DU has the case where interface, or have the case where interface for O&M and DU.To connecing before this Mouthful method for building up include the side DU processing and the side CU processing, here, for convenience of description for the sake of, to be interacted between DU and CU Mode introduce the method for building up, method includes the following steps:

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 (TAC), public land mobile communications network (PLMN) identification list of broadcast, transmission receiving point (TRP) information, wave beam (Beam) Physic channel information in information, the cell, transmitting channel information in the cell, in the cell logical channel information and/ Or the cell access layer (AP) for F1 interface of the DU distribution identifies.The cell ID can be Cell Global Identity or Other cell IDs DU upper unique cell ID or received from O&M.The cell AP of the DU distribution is identified for establishing F1 The cell signaling connection of interface is used for transmission the relevant information of cell.The information of the serving cell also includes clock information, example 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.

Step 202, 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 Load balancing between the DU or the different DU of decision of UE.

Wherein, the F1, which establishes response 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.

Cell configuration list.Community configured information in the cell configuration list includes: cell ID, the cell The scheduling information and/or described that the configuration information of middle common signal channel, the system information in the cell, the system information are sent The cell AP for F1 interface of CU distribution is identified.The cell ID can be unique cell on Cell Global Identity or DU Mark or CU on unique cell ID.The common signal channel configuration information is matched comprising physical channel configuration information, transmission channel Confidence breath, logic channel configuration information of data radio bearer.The system information includes Master Information Block (MIB), system information block.CU is received according to from DU The scheduling information of the clock information decision systems information of the cell arrived.CU the clock information of the cell received from DU (such as SFN it) is included in system information.The cell AP of the CU distribution identifies the cell signaling connection for establishing F1 interface, is used for Transmit the relevant information of cell.Here, if it includes cell configuration list in response message that F1, which is established, mean to establish in F1 Cell foundation is completed in the process.

As previously mentioned, if establishing in F1 includes cell configuration list in response message, it is meant that established by F1 Journey has configured 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 have been sent to DU, and such DU can quick work Make.As another method of the invention, cell establishment process is also possible to individual process, in this case, builds in F1 It does not include cell configuration list in vertical response message.Corresponding this method, also includes step:

Step 203, CU sends cell and establishes request message to DU.

It includes the cell information to be configured that the cell, which establishes request message,.The cell information to be configured and step Community configured information in 202 is identical, and which is not described herein again.

Step 204, DU sends cell and establishes response message to CU.

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., the described cell establishes request message and cell is established The cell AP mark of cell AP mark and CU distribution in response message comprising DU distribution, in this case, the cell is established Request message and cell, which are established in response message, can not need to include cell ID.

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 can send system information after configuring as early as possible.As another method of the invention, system information transmission be can be Individual process.Corresponding this method, also includes step:

Step 205, CU sends system information transmissions message to DU.

The system information transmissions message includes cell ID, the system information in the cell, system information hair The scheduling information sent.CU is according to the scheduling information of the clock information decision systems information of the cell received from DU.CU are received from DU To cell clock information 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., the described system information transmissions message In comprising DU distribution cell AP mark and CU distribution cell AP mark, in this case, the system information transmissions message In can not need to include 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.

Embodiment two:

The method for building up two of ongoing interface of the present invention is as shown in Figure 3.F1 interface establishment process is initiated by CU in this method.It should Method can be used for O&M and CU and DU has the case where interface, or have the case where interface for O&M and CU.To connecing before this Mouthful method for building up include the side DU processing and the side CU processing, here, for convenience of description for the sake of, to be interacted between DU and CU Mode introduce the method for building up, method includes the following steps:

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 O&M.Application layer message on CU is allocated to CU by O&M. If O&M is only and CU has interface, the application layer message on each DU that CU to be connected also is configured to CU by O&M.

- 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.It should be noted that at O&M Have with CU and just need when interface comprising this information, the configuration information of DU is configured to CU by O&M, and is transmitted to corresponding DU by CU.

Cell configuration list.Community configured information in the cell configuration list includes: cell ID, the cell The scheduling information and/or described that the configuration information of middle common signal channel, the system information in the cell, the system information are sent The cell AP for F1 interface of CU distribution is identified.The cell ID can be unique cell on Cell Global Identity or DU Mark or CU on unique cell ID.The common signal channel configuration information is matched comprising physical channel configuration information, transmission channel Confidence breath, logic channel configuration information of data radio bearer.The system information includes Master Information Block MIB, system information block.CU is according to DU cell The scheduling information of clock information decision systems information.CU is included in the clock information (such as SFN) of DU cell in system information. 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, if it includes cell configuration list in request that F1, which is established, mean to complete cell foundation in F1 establishment process.

Step 302, DU receives F1 and establishes request message.DU saves the information received.If DU has received cell with confidence Breath, DU configure corresponding cell.DU sends F1 and establishes response message to CU.

Wherein, F1, which establishes response message, may include one or more combinations of following information:

- DU mark.

Community configured information.Here community configured information is actual disposition information of the DU to cell, can be asked with CU Ask different.

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 load balancing between different DU.CU sends F1 and establishes response message to DU.

As previously mentioned, being equivalent to and being established by F1 if establishing in request message in F1 includes cell configuration list Journey has configured 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 have been sent to DU, and such DU can quick work Make.As another method of the invention, cell establishment process is also possible to individual process, in this case, builds in F1 It does not include cell configuration list in vertical request message.Corresponding this method, also includes step:

Step 303, CU sends cell and establishes request message to DU.

It includes the cell information to be configured that the cell, which establishes request message,.The cell information to be configured and step Community configured information in 301 is identical, and which is not described herein again.

Step 304, DU sends cell and establishes response message to CU.

Step 305, CU sends system information transmissions message to DU.

The system information transmissions message includes cell ID, the system information in the cell, system information hair The scheduling information sent.CU is according to the scheduling information of the clock information decision systems information of DU cell.CU believes the clock of DU cell Such as SFN is ceased to be included 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 DU points in the described system information transmissions message The cell AP mark of the cell AP mark and CU distribution matched, in this case, can be not required in the system information transmissions message It to include cell ID.

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., the described system information transmissions message In comprising DU distribution cell AP mark and CU distribution cell AP mark, in this case, the system information transmissions message In can not need to include cell ID.

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.

Embodiment three:

The method for building up three of ongoing interface of the present invention is as shown in Figure 4.F1 interface establishment process is triggered by CU in this method.It should Method can be used for O&M and CU and DU has the case where interface, or have the case where interface for O&M and CU.To connecing before this Mouthful method for building up include the side DU processing and the side CU processing, here, for convenience of description for the sake of, to be interacted between DU and CU Mode introduce the method for building up, method includes the following steps:

Step 401, CU sends F1 and establishes requirement message to DU.

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.

Step 402, DU sends F1 and establishes request message to CU.DU configures from O&M or obtains from CU the application layer on DU 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 does not need the information list comprising serving cell on the DU.

Step 403, CU receives F1 and establishes request message.CU saves the information received.If CU has received the ability letter of DU Breath, CU dispatch UE using the information, such as determine that selection serves the DU of UE or determines that the load between different DU is equal Weighing apparatus.CU sends F1 and establishes response message to DU.

The PLMN identification list that-CU is supported.

Cell configuration list.Community configured information in the cell configuration list includes: cell ID, the cell The scheduling information and/or described that the configuration information of middle common signal channel, the system information in the cell, the system information are sent The cell AP for F1 interface of CU distribution is identified.The cell ID can be unique cell on Cell Global Identity or DU Mark or CU on unique cell ID.The common signal channel configuration information is matched comprising physical channel configuration information, transmission channel Confidence breath, logic channel configuration information of data radio bearer.The system information includes Master Information Block MIB, system information block.CU is according to DU cell The scheduling information of clock information decision systems information.CU is included in the clock information such as SFN of DU cell in system information.Institute The cell AP for stating CU distribution identifies cell signaling connection for establishing F1 interface, is used for transmission the relevant information of cell.Here, If it includes cell configuration list in response that F1, which is established, it is equivalent to and completes cell foundation in F1 establishment process.

As previously mentioned, being equivalent to and being established by F1 if establishing in response message in F1 includes cell configuration list Journey has configured 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 have been sent to DU, and such DU can quick work Make.Alternatively, cell establishment process can be individual process, in this case, in F1 as another method of the invention Establishing does not include cell configuration list in 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 can send system information after configuring as early as possible.As another method of the invention, system information transmission be can be Individual process.Corresponding this method, specific steps are identical as described in 205, and which is not described herein again.

When DU application layer message update when, such as DU ability information or clock information update when, DU send DU Configuration update message is to CU, the application layer message for notifying CU to update.CU saves the information received.Optionally, CU can also be sent 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 For update message to DU, the message includes the system information updated and/or the scheduling information of system information.CU can also pass through DU Configuration updates response message and sends the scheduling information of the system information/or system information that update to DU.

When CU application layer message update when, such as CU support PLMN list information updating when, CU send CU match Update message is set to DU, notifies the application layer message of DU update.DU saves the information received.Optionally, DU can also send CU Configuration updates response message to CU.

Example IV:

The method of UE access of the present invention is as shown in figure 5, this method can be used for adhering to (Attach), Packet Data Network (PDN) scenes such as connection foundation.

For UE and core net (including AMF and UPF), access network entity is gNB.If gNB has been further separated into CU It is sightless for UE and core net with DU functional entity.Therefore, when communication process between description and UE, description Be RRC process between UE and gNB；When communication process between description and core net, describe gNB and AMF or UPF it Between process.If gNB is divided into CU and DU functional entity, the practical entity received first in the side gNB from the UE RRC information come It is DU, then CU is sent to by DU；And being received first in the side gNB from the entity of the AMF NG message come is CU.It is in the present invention Description is simple, and the interface procedure between UE and gNB is directly described as the interface procedure between UE and DU, and gNB and AMF Or the process between UPF is directly described as the process of CU and AMF or UPF, other embodiments are also similar, this does not influence of the invention Main contents.It is omitted here the detailed description of step unrelated to the invention, such as the process between AMF and SMF and UPF. Method shown in Fig. 5 the following steps are included:

Step 501, UE sends RRC connection request message to base station.

Step 502, DU receives the message come from UE.The message come from UE is received on DU secondary common control physical channel (CCCH), Know that UE is in idle mode or an inactive mode.DU sends initial UE message transmission message to CU.

The initial UE message transmission message is F1 application layer AP message.It may include one or more of in the message The combination of information element:

- DU is the DU UE AP ID of UE distribution.

Cell ID.That is DU receives the message come from UE in which cell.The cell ID can be global cell mark Know or DU under unique cell ID under unique cell ID or CU.If the cell ID is unique cell mark under DU Know, is also identified comprising DU in the initial UE message transmission message.

Tracing area identifies (TAI).

The RRC information received from UE.

- DU is the Cell Radio Network Temporary Identifier/Identity, Cell-RNTI (C-RNTI) of UE distribution.

RRC information between DU and CU can be transmitted by control plane (passing through F1AP message), or: signaling without RRC information on line carrying SRB0 is transmitted by control plane, and the RRC information on other SRB is transmitted by user plane, Transmitted by the GPRS Tunnel Protocol of user plane (GTP-U).

RRC information on corresponding SRB0 by control planar transmission, RRC information on other SRB by user plane come The method of transmission, the RRC information on other SRB can be transmitted by the same user plane channel, can also be corresponded to each A SRB establishes a user plane channel, is transmitted respectively by different channels.Corresponding later approach, it is as described below The channel information of distribution is each corresponding SRB.It is established the present embodiment provides three kinds of modes and transmits RRC information between DU and CU User plane channel:

Mode one: in step 502, the channel information of DU allocation of downlink transmits message for distribution by initial UE message Down going channel information is sent to CU.In step 503, CU distributes the channel information of uplink, and configuring message by radio bearer will divide The data feedback channel information matched is sent to DU.The channel information of the downlink and the channel information of uplink include gap marker (TEID) And/or transport Layer address.

Mode two: in step 502, the channel information of DU allocation of downlink transmits message for distribution by initial UE message Down going channel information is sent to CU.In step 505, CU distributes the channel information of uplink, and transmitting message by downlink RRC will distribute Data feedback channel information be sent to DU.The channel information of the downlink and the channel information of uplink include gap marker TEID and/ Or transport Layer address.

Mode three: in step 503, CU distributes the channel information of uplink, configures message for the upper of distribution by radio bearer Row of channels information is sent to DU.In step 504, the channel information of DU allocation of downlink will by radio bearer configuration response message The down going channel information of distribution is sent to CU.The channel information of the downlink and the channel information of uplink include gap marker TEID And/or transport Layer address.

Step 503, CU receives the initial UE message come from DU and transmits message.According to the RRC information for including in the message, It is RRC connection request message that CU, which is known,.CU is the CU UE AP ID that UE is distributed on F1 interface.CU sends radio bearer configuration and disappears It ceases to DU, requests DU to establish UE context and be UE configured radio bearer, the radio bearer is the configuration of SRB.It is described wireless It may include the one or more of following information element in carrying configuration message:

- 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 Signaling Radio Bearer (SRB) and/or data without Line carries (DRB).In this step, the RB to be configured is SRB.

The configuration information of physical channel.

The configuration information of transmission channel.

The configuration information of logic channel.

Data feedback channel information.It is corresponding to establish between DU and CU the user plane channel side for transmitting RRC information as previously described Formula one and mode three, the radio bearer configure the channel information of the uplink comprising CU distribution in message.The channel information is It is transmitted for RRC information on SRB every other outside SRB0.Or there is the channel information of a distribution for each SRB.

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 sends radio bearer configuration response message to CU.The radio bearer configuration is rung Message is answered to may include 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.It is corresponding to establish DU and CU as previously described Between transmit the user plane channel mode three of RRC information, comprising under DU distribution in the radio bearer configuration response message Capable channel information.

- DU is the C-RNTI of UE distribution.

In method of the invention, DU can be that the C-RNTI that UE is distributed is sent to CU DU by this step or step 502. CU saves this when receiving the C-RNTI that DU is UE distribution.CU in this way be known that DU the cell be UE distribution The C-RNTI crossed selects the C- not distributed in the cell when CU needs to distribute C-RNTI for UE in handoff procedure RNTI value distributes to UE.

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 downlink RRC transmission message to DU.The downlink RRC transmission message includes the one of following information 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.

RRC information.The RRC information is that message is established in RRC connection in the present embodiment.CU can be distributing for UE C-RNTI is sent to UE by RRC information.

Send the logical channel information of RRC information.

Data feedback channel information.It is corresponding to establish between DU and CU the user plane channel side for transmitting RRC information as previously described Formula two, the downlink RRC transmit the channel information of the uplink comprising CU distribution in message.The channel information is for institute outside SRB0 There is RRC information transmission on other SRB.Or there is the channel information of a distribution for each SRB.

CU can also send RRC connection by the message of step 503 and establish message to DU.Corresponding this method, step 505 It can not execute.

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 control plane or user plane.According to from allocated The message received in DCCH resource, DU know that received RRC information is the message of which UE.

It is corresponding by way of controlling plane and the RRC information received be sent to CU, DU send uplink RRC transmission message to CU.The uplink RRC transmission message may include 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.

RRC information.The RRC information is RRC connection setup complete message in the present embodiment.

It corresponds in such a way that the RRC information on the SRB except user plane sends SRB0 is to CU, DU passes through GTP-U and sends out Row RRC information is served to CU.

RRC information on corresponding other SRB other than SRB0 by way of transmitting, is used a user plane channel It may include the information of SRB, such as SRB1 or SRB2 in the plane packet header of family.Or CU can be by obtaining between parsing RRC information Know the SRB information for receiving RRC information.

RRC information each SRB on corresponding other SRB other than SRB0 has a corresponding user plane channel Mode, DU are transferred to CU on which established user plane channel according to the SRB for receiving RRC information, selection.

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；Session is established if necessary, then the initial context of AMF sending step 510 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 carries out subsequent step without executing step Rapid 511 to step 516 RB reconfiguration course.

CU sends RRC information downlink NAS by control plane or user plane and transmits message to DU.

It corresponds in such a way that control plane sends RRC information to DU, CU sends downlink RRC transmission message to DU.It is described Downlink RRC transmission message may include 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.

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 sends SRB0, under CU is sent by GTP-U Row NAS transmits message to DU.

RRC information on corresponding other SRB other than SRB0 by way of transmitting, is used a user plane channel It may include the information of SRB, such as SRB1 or SRB2 in the plane packet header of family.It can also include the RRC in user plane packet header Message needs the information in which logical message transmission.

RRC information each SRB on corresponding other SRB other than SRB0 has a corresponding user plane channel Mode, CU send RRC information on the corresponding channel and know the RRC information at which according to the channel for receiving information to DU, DU UE is sent on a SRB.

Step 511, CU sends radio bearer reconfiguration request message to DU.The radio bearer reconfiguration request message can With one or more combinations comprising following information:

- 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 (Flow) information and/or the data feedback channel information of the RB.The QoS 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 data transmission between DU and CU can share a channel GTP-U with multiple RB, can also be with each RB uses a channel GTP-U.

Step 512, DU distributes resource.DU sends radio bearer reconfiguration response message to CU.The radio bearer reconfiguration Setting response message may include 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.

The configuration information of-RB.The configuration information of RB is identified comprising RB, the down going channel information of DU distribution.The downlink is logical Road information includes transport Layer address and uplink TEID.

Step 513, CU sends RRC information RRC connection reconfiguration by control plane or user plane and sets to DU.

- 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 that RRC connection reconfiguration is set in the present embodiment.

By way of RRC information on the corresponding SRB except user plane sends SRB0, CU sends RRC by GTP-U Connection reconfiguration is set to DU.

RRC information each SRB on corresponding other SRB other than SRB0 has the mode in a user plane channel, CU sends RRC information on the corresponding channel and knows the RRC information in which SRB according to the channel for receiving information to DU, DU On be sent to UE.

Step 5014, DU sends the RRC information received from CU to UE.

Step 5015, UE sends RRC connection reconfiguration and sets completion message to base station.

Step 5016, DU sends the RRC information received to CU by control plane or user plane.According to from allocated The message received in DCCH resource, DU know that the RRC information is the message of which UE.

It is corresponding in such a way that control plane sends the RRC information received to CU, DU send uplink RRC transmission message to CU.The uplink RRC transmission message may include 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.

RRC information.The RRC information is that RRC connection foundation reconfigures and completes message in the present embodiment.

RRC information each SRB on corresponding other SRB other than SRB0 has the mode in a user plane channel, DU is transferred to CU on which established user plane channel according to the SRB for receiving RRC information, selection.

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 It when CU the problem of UE access, can be used for the scenes such as Attach, PDU foundation, guarantee that DU and CU supports the interconnection of multi-vendor equipment Intercommunication.

Embodiment five:

UE of the present invention switches (that is: the source DU and purpose DU of switching correspond to the same CU) between the different DU of the same CU Method is as shown in Figure 6.It is omitted here the detailed description of step unrelated to the invention, such as the mistake between AMF and SMF and UPF Journey.Method includes the following steps:

Step 601, UE sends measurement report message to base station.DU is received after the RRC information that UE comes, by controlling plane Or RRC information is sent to CU by user plane.Especially by control plane and the method and step 508 that are sent by user plane With describe identical in step 516, 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 (MBB:Make before break) switching is executed before logical switching or disconnection.CU sends radio bearer configuration message to mesh DU (T-DU), request T-DU establishes UE context and for UE configured radio bearer, and the radio bearer includes SRB's and DRB Configuration.

The radio bearer configuration message may include 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 purpose cell ID be purpose cell Cell Global Identity or DU under it is unique small Area mark or CU under unique cell ID.

In the RB information that T-DU to be configured.The RB for including in the message can be SRB and/or DRB.In this step, The RB to be configured is 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.Correspondence is removed For other RRC informations outside SRB0 by the method for user-plane transmissions, the radio bearer configuration message includes that CU distributes for SRB Data feedback channel information, the communication information can be it is corresponding it is each SRB's or the RRC information biography all SRB on other than SRB0 Defeated 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.

The method that the present invention provides two kinds to distribute C-RNTI in handoff procedure for UE:

Method one: being C-RNTI of the UE distribution in purpose cell by CU；

Method two: being C-RNTI of the UE distribution in purpose cell by purpose DU.

The method one of UE distribution C-RNTI is corresponded to, CU is C-RNTI of the UE distribution in purpose cell.C- of the CU distribution RNTI configures message by radio bearer and is sent to purpose DU.CU needs to guarantee the C-RNTI when distributing C-RNTI to UE In the uniqueness of the cell.Because UE is to distribute C-RNTI by DU for UE during being initially accessed, DU can be for UE The C-RNTI of distribution is sent to CU, so that the C-RNTI distributed for UE can be sent to UE by RRC information by CU.CU is being received When DU is the C-RNTI of UE distribution, which is saved, such CU can know that DU was distributed in the cell for UE C-RNTI, when in handoff procedure CU need for UE distribute C-RNTI when, select the C-RNTI not distributed in the cell Value distributes to UE.

Step 603, T-DU configures resource.T-DU sends radio bearer configuration response message to CU.The radio bearer is matched Setting response message may include 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.The side that corresponding other RRC informations in addition to SRB0 pass through user-plane transmissions Method, the message include the down going channel information that T-DU is SRB distribution, the communication information can be it is corresponding it is each SRB's or RRC information transmits common channel on all SRB other than SRB0.The channel information includes transport Layer address and TEID.

The method two of UE distribution C-RNTI is corresponded to, purpose DU is C-RNTI of the UE distribution in purpose cell.Purpose DU handle The C-RNTI of distribution is sent to CU by radio bearer configuration response message.Purpose DU needs when distributing C-RNTI to UE Guarantee the C-RNTI in the uniqueness of the cell.

The method one of UE distribution C-RNTI is corresponded to, purpose DU saves the C- for including in the radio bearer configuration message received RNTI.Without using the value of the C-RNTI when purpose DU next time is the UE distribution C-RNTI being initially accessed.If purpose DU is received To radio bearer configuration message in include C-RNTI be already allocated to other UE, there are two types of processing modes by purpose DU:

Mode one: purpose DU sends radio bearer configuration failure message to CU.The reason of message may include unsuccessfully: Invalid C-RNTI.CU terminates to switch the process of UE to T-DU.

Mode two: purpose DU distributes another C-RNTI not used and passes through radio bearer to UE, and new C-RNTI Configuration response message is sent to CU.CU is received after the new C-RNTI that DU comes, and is revised as the C-RNTI of UE distribution.

Step 604, CU sends RRC connection reconfiguration by control plane or user plane and sets message to S-DU.CU are UE The C-RNTI in purpose cell of distribution is included in RRC connection reconfiguration and sets in message, and the C-RNTI is CU or purpose DU distribution 's.It corresponds to by way of controlling planar transmission, CU sends downlink RRC transmission message to S-DU.The downlink RRC transmits message It may include one or more combinations of following information:

- CU is the CU UE AP ID of UE distribution.

- S-DU is the DU UE AP ID of UE distribution.

Send the logical channel information of RRC information.

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 switching.If S-DU has received the instruction information of MBB switching, in the RRC information that transmission receives After UE, it can continue to send data to UE and receive the upstream data come from UE.S-DU is receiving the data transmission come from CU Stop sending downlink data to UE after stopping instruction and/or stops receiving the data come from UE.Or when S-DU decision stops UE is sent data to, such as stops sending data to UE after S-DU is no longer received and confirmed from the uplink that UE comes.

It corresponds in such a way that user plane transmission RRC connection reconfiguration sets message to S-DU, CU is disappeared by individual F1AP The following information of breath transmission is to S-DU or includes following information in data packet head:

It corresponds in such a way that user plane transmission RRC connection reconfiguration sets message to S-DU, is also wrapped in the data packet head Logic channel containing DU UE AP ID and/or transmission RRC information that CU UE AP ID, the S-DU that CU is UE distribution are UE distribution Information.

Step 605, DU sends the RRC information received to UE.

Corresponding CU determines to switch using MBB, and CU determines when S-DU stops sending downlink data to UE or stop 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.

CU can start to send data to T-DU, and data that are that CU not confirms UE and receiving 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 side 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.One message of RLC context transfer can be with One or more combinations comprising following information:

- CU is the CU UE AP ID of UE distribution.

- S-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/or sends not successfully.

Step 605b, CU send two message of RLC context transfer to T-DU.Two message of RLC context transfer can be with One or more combinations comprising following information:

- 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.

- 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 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 is sent by control plane or user plane and is received The RRC information arrived 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.

Embodiment six:

By the different DU of same CU access, (that is: UE is accessed UE of the present invention by DU-1 and DU-2, DU-1 and DU-2 pairs Answer the same CU) method it is as shown in Figure 7.Be omitted here the detailed description of step unrelated to the invention, for example, AMF and Process between SMF and UPF.The method comprising the steps of:

Step 701, UE sends measurement report message to base station.DU is received after the RRC information that UE comes, by controlling plane Or user plane sends the RRC information received to CU.Especially by control plane and the method and step that are sent by user plane Rapid 508 and step 516 in describe identical, which is not described herein again.The DU of this step is the DU (DU-1) for being currently serviced in UE.

Step 702, according to the measurement report of UE, CU determines the cell for a part carrying of UE being switched to DU-2.CU determines It is fixed to execute common switching or the switching of MBB.CU sends radio bearer configuration message to DU-2, and DU-2 is requested to establish UE context It and is UE configured radio bearer.CU decision is that part DRB or all DRB are switched to DU-2.If SRB is also switched to On DU-2, then mean that this is a handoff procedure from DU-1 to DU-2, while DRB is established on DU-1, this process Be equivalent to the combination of switching part or the process on whole DRB to DU-2 in the handoff procedure and the present embodiment of Fig. 5, here not into Row detailed description.The radio bearer configuration message may include the one or more of following information element:

- CU is the CU UE AP ID of UE distribution.

Contextual information of-the UE in DU-1.The contextual information of the UE includes cell ID, UE of the UE in DU-1 cell In the RB configuration information of DU-1 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.

In the RB information that DU-2 to be configured.

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.The channel Information includes transport Layer address and TEID.

The instruction of-MBB switching.

Here there are two types of the methods for distributing C-RNTI for UE:

Method one: being C-RNTI of the UE distribution in DU-2 cell by CU；

Method two: being C-RNTI of the UE distribution in DU-2 cell by DU-2.

The method one of UE distribution C-RNTI is corresponded to, CU is C-RNTI of the UE distribution in DU-2 cell.C- of the CU distribution RNTI configures message by radio bearer and is sent to DU-2.CU needs to guarantee that the C-RNTI exists when distributing C-RNTI to UE The uniqueness of the cell.Because UE is to distribute C-RNTI by DU for UE during being initially accessed, DU can be being UE point The C-RNTI matched is sent to CU, so that the C-RNTI distributed for UE can be sent to UE by RRC information by CU.CU is receiving DU For UE distribution C-RNTI when, which is saved, such CU has been known that DU in the cell is that UE was distributed C-RNTI selects the C-RNTI value that do not distributed in the cell to distribute to UE when CU needs to distribute C-RNTI for UE.

Step 703, DU-2 configures resource.DU-2 sends radio bearer configuration response message to CU.The radio bearer is matched Setting response message may include one or more combinations of following information:

- CU is the CU UE AP ID of UE distribution.

- DU-2 is the DU UE AP ID of UE distribution.

For the RB information of UE configuration.Each corresponding RB, the radio bearer configuration response message include DU-2 distribution Down going channel information.The channel information includes transport Layer address and TEID.

The method two of UE distribution C-RNTI is corresponded to, DU-2 distributes UE in the C-RNTI of DU-2 cell.DU-2 is distribution C-RNTI is sent to CU by radio bearer configuration response message.DU-2 needs to guarantee the C- when distributing C-RNTI to UE Uniqueness of the RNTI in the cell.

The method one of UE distribution C-RNTI is corresponded to, DU-2 saves the C- for including in the radio bearer configuration message received RNTI.Without using the value of the C-RNTI when DU-2 is the UE distribution C-RNTI being initially accessed next time.What if DU-2 was received The C-RNTI for including in radio bearer configuration message is already allocated to other UE, and there are two types of processing modes by DU-2:

Mode one: DU-2 sends radio bearer configuration failure message to CU.The reason of message may include unsuccessfully: nothing The C-RNTI of effect.CU terminates to configure the process of UE to DU-2.

Mode two: DU-2 is distributed another C-RNTI not used and is matched to UE, and new C-RNTI by radio bearer It sets response message and is sent to CU.CU is received and is revised as the C-RNTI that UE is distributed after the new C-RNTI that DU-2 comes.

Step 704, CU sends RRC connection reconfiguration by control plane or user plane and sets message to DU-1.CU are UE The C-RNTI in DU-2 cell of distribution is included in RRC connection reconfiguration and sets in message.The C-RNTI is CU or DU-2 distribution. It corresponds to by way of controlling planar transmission, CU sends downlink RRC transmission message to DU-1.The downlink RRC transmission message can With one or more combinations comprising following information:

- CU is the CU UE AP ID of UE distribution.

- DU-1 is the DU UE AP ID of UE distribution.

Send the logical channel information of RRC information.

Switch the information of the RB walked.It is described to switch the RB information walked include RB mark, the mark of purpose DU and/or The mark of purpose cell.For to switch the RB walked, DU-1 stops sending number to UE after sending the RRC information received to UE According to, no longer receive from UE come upstream data.CU can also be sent by individual message will switch the RB information walked to DU-1. Corresponding this method, CU notice DU to switch the RB information walked message and this step message can after this step or it Before.

The instruction of-MBB switching.If DU-1 has received MBB indication message, send the RRC information that receives to After UE, the upstream data for continuing to send data to UE on the RB walked and receiving from UE can switched.DU-1 receive from The data that CU comes, which are sent, to be stopped stopping at corresponding RB transmission downlink data after indicating to UE and/or stops receiving the number come from UE According to.Or when DU-1 decision stops sending data to UE, such as stops after DU-1 no longer receives the uplink confirmation come from UE Send data to UE.

Step 705, DU-1 sends the RRC information received to UE.

Corresponding CU determines to switch using MBB, and CU determines when DU-1 stops to switch and sends downlink data on the RB walked To UE or stop method with the communication of UE, when CU determine DU-1 stop on the RB that switch send downlink data to UE or When stopping the communication with UE, CU sends data and stops instruction message to DU-1.DU-1 is received after the corresponding message that CU comes, and is stopped To switch the communication on the RB walked with UE.

CU can start to send data on the RB of DU-2 to be switched to DU-2, it is that CU not confirms UE and from The data that UPF is received are sent to DU-2.The data are PDCP PDU.

For the RB to be switched, there are two types of the methods that data are sent here:

Method one, data that are that CU directly not confirms UE and receiving from UPF are sent to DU-2.The data are PDCP PDU.The data forwarding between DU-1 and DU-2 is not needed.

Method two, data that are that CU directly not confirms UE and receiving from UPF are sent to DU-2.The data are PDCP PDU.In order to avoid some RLC PDU are successfully sent to UE from DU-1 and repeat to send in DU-2, DU-1 is source RLC context be sent to DU-2.The PDCP PDU, DU-2 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 The step of row similar 605a and 605b, DU-1 by CU transmission RLC context to DU-2, difference with step 605a and 605b it Be in RLC context just for the RB to be switched, and S-DU is DU-1, T-DU is DU-2, other be it is identical, here It repeats no more.This method is suitable for DU-1 and DU-2RB and configures identical situation.Optionally, DU-1 can also be not true by UE The RLC PDU recognized is transmitted to DU-2.Step 605a and step 605b is not essential step of the invention.

Step 706, UE is synchronized to purpose cell.

Step 707, UE sends RRC connection and establishes completion to base station.DU-1 is sent by control plane or user plane and is received The RRC information arrived is to CU.The specific method that DU-1 is sent to CU is identical as step 5016, and which is not described herein again.

Step 708, CU transmission radio bearer configuration completion instruction message is to DU-2, the RB configuration information that CU is received from UE It is sent to DU-2.It can be only comprising configuring poor (delta configuration) in the message, i.e. configuration of the DU-2 to UE, and UE is not complete The practical difference according to the requirement of network entirely.It may include the complete configuration of UE in the message.

Step 709, CU transmission radio bearer reconfigures or RB release message is to DU-1.The message includes that CU distributes for UE CU UE AP ID, DU-1 is the DU UE AP ID of UE distribution.The message includes the RB information to be discharged or successful switch To the RB information of DU-2.The RB information is identified comprising RB.

Step 710, DU-1 sends radio bearer and reconfigures response or RB release response message to CU.

So far, that is, it completes UE of the present invention and passes through the description of the different DU of the same CU method accessed.In this way, It can solve the problem of UE is by different DU access when gNB is divided into DU and CU, improve the handling capacity of UE, avoid the number of switching carrier According to loss, guarantee that DU and CU supports interconnecting for multi-vendor equipment.

Method, the method for UE access and the method for switching that ongoing interface is established in the present invention, can solve gNB and are divided into Communication issue when DU and CU reduces the deployment cost of operator, improves the handling capacity of UE, avoids loss of data, guarantee DU and CU supports interconnecting for multi-vendor equipment.

The foregoing is merely the preferred embodiments of the application, not to limit the application, all essences in the application Within mind and principle, any modification, equivalent substitution, improvement and etc. done be should be included within the scope of the application protection.

Claims

1. a kind of user equipment (UE) cut-in method characterized by comprising

Distribution unit DU in base station receives radio resource control RRC connection request message from UE；

The DU is sent by user plane channel between the centralized unit CU in base station or control plane channel to CU initial UE message transmits message；

The DU receives radio bearer configuration request message from CU；

DU information configuration resource based on the received, and radio bearer configuration response message is sent to CU；

The DU receives downlink RRC from the CU and transmits message；

The DU receives RRC connection setup complete message from the UE；

2. according to the method described in claim 1, it is characterized by:

Include one of following information or multiple combinations in the initial UE message transmission message: DU is point of UE distribution Cloth unit users equipment access layer protocol-identifier DU UE AP ID, DU receive the cell of the cell of the RRC connection request message Mark, tracing area mark TAI, the RRC connection request message, the Cell Radio Network Temporary Identifier/Identity, Cell-RNTI C- that DU is UE distribution RNTI；

And/or include one of following information or multiple combinations in the radio bearer configuration request message: CU is the UE CU UE AP ID, the DU of distribution be the UE distribution DU UE AP ID, the UE where cell ID, to be configured it is wireless Carry RB information, the configuration information of physical channel, the configuration information of transmission channel, the configuration information of logic channel, data feedback channel Information；

And/or the radio bearer configuration response message includes one or more combinations of following information: CU is the UE points CU UE AP ID, the DU matched is DU UE AP ID of the UE distribution, is the RB information that UE is configured, the C- that DU is UE distribution RNTI；

And/or the downlink RRC transmission message includes one or more combinations of following information: CU is UE distribution The logic that CU UE AP ID, DU are DU UE AP ID of UE distribution, RRC connection establishes message, sends RRC information Channel information, data feedback channel information, the C-RNTI that CU is UE distribution；

And/or DU sends one or more combinations of following information when RRC connection setup complete message is sent to CU It is the DUUE AP ID that the UE is distributed to CU UE AP ID, the DU that the CU:CU is the UE distribution.

3. method according to claim 1 or 2, it is characterised in that:

When not needing to establish session, the DU receives access control from the CU by control plane channel or user plane channel The downlink Non-Access Stratum NAS that system and mobile management functional entity AMF are sent transmits message, and is transmitted to the UE；

When needing to establish session, the DU receives radio bearer reconfiguration request message, the radio bearer weight from the CU Configuration request message includes one or more combinations of following information: CU is that CU UEAP ID, the DU of UE distribution are UE distribution DU UE AP ID, the RB information wanting increased RB information, being reconfigured, the RB information to be deleted；DU distributes resource, concurrently Send radio bearer reconfiguration response message to CU, the radio bearer reconfiguration response message includes one kind or more of following information The combination of kind: CU is that CU UE APID, the DU of UE distribution are the configuration information of DU UE AP ID of UE distribution, RB；DU connects from CU It receives RRC connection reconfiguration and sets message, and be sent to UE；DU, which sets the RRC connection reconfiguration that UE is sent, completes message by controlling plane Or user plane is sent to CU.

4. method according to any one of claims 1 to 3, it is characterised in that:

RRC information between DU and CU is by control planar transmission, alternatively, the RRC information on Signaling Radio Bearer SRB0 passes through Planar transmission is controlled, the RRC information on other SRB passes through user-plane transmissions；

When mode one: DU receives RRC connection request message from UE, the channel information of DU allocation of downlink, and pass through initial UE message The down going channel information of distribution is sent to CU after CU distributes the channel information of uplink and is configured by radio bearer by transmission message The data feedback channel information of distribution is sent to DU by message；The channel information of the downlink and the channel information of uplink are marked comprising channel Know TEID and/or transport Layer address.

When mode two: DU receives RRC connection request message from UE, the channel information of DU allocation of downlink is passed by initial UE message The down going channel information of distribution is sent to CU by defeated message, after DU sends radio bearer configuration response message to CU, CU distribution The channel information of uplink transmits message by downlink RRC and the data feedback channel information of distribution is sent to DU；The channel of the downlink The channel information of information and uplink includes gap marker TEID and/or transport Layer address.

After mode three: DU sends initial UE message transmission message to CU, CU distributes the channel information of uplink, is matched by radio bearer It sets message and the data feedback channel information of distribution is sent to DU, the channel information of DU allocation of downlink passes through radio bearer configuration response The down going channel information of distribution is sent to CU by message；The channel information of the downlink and the channel information of uplink are marked comprising channel Know TEID and/or transport Layer address；

For RRC information on corresponding SRB0 by controlling planar transmission, the RRC information on other SRB passes through user-plane transmissions Mode, the RRC information on other SRB is by the same user plane channel transfer, alternatively, each corresponding SRB establishes one User plane channel, is transmitted respectively, correspondingly, the upstream or downstream channel information distributed is each corresponding SRB.

5. a kind of cut-in method of UE characterized by comprising

CU, which by user plane channel between DU or control plane channel receives the DU and is forwarded from the RRC connection request of UE, to disappear Breath；

The CU sends radio bearer configuration request message to the DU；

The CU, which by user plane channel between DU or control plane channel sends RRC to the DU and connect, establishes message, And it the DU is received by user plane channel between DU or control plane channel is forwarded from the RRC of the UE and connect and established At message.

6. a kind of switching method of UE, which is characterized in that the source DU and purpose DU of the switching correspond to the same CU, this method packet It includes:

CU receives the measurement report message that UE issues base station by user plane channel between the DU of source or control plane channel；

After the CU determination switches over UE, radio bearer is sent to purpose DU and configures message；

The CU receives the radio bearer configuration response message that the purpose DU is sent；

The CU sends RRC connection reconfiguration by the user plane channel or control plane channel and sets message to the source DU, And the instruction that MBB is executed by the information switched between different DU and/or before disconnecting 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 or control plane channel are sent；The RRC connection setup complete message is The UE is sent to the base station；

The CU sends UE context release message to the source DU.

7. according to the method described in claim 6, it is characterized by:

The radio bearer configuration message includes one of following information or multiple combinations: CU is the CUUE AP of UE distribution ID, UE are in the contextual information of S-DU, purpose cell ID, the RB information to be configured, the configuration information of physical channel, transmission letter The instruction that the configuration information in road, the configuration information of logic channel, data feedback channel information, MBB switch；

And/or include one of following information or multiple combinations in the radio bearer configuration response message: CU is UE distribution CU UE AP ID, purpose DU be UE distribution DU UE AP ID, be UE configuration RB information.

8. method according to claim 6 or 7, it is characterised in that:

For RRC information on corresponding SRB0 by controlling planar transmission, the RRC information on other SRB passes through user-plane transmissions Mode, the RRC information on other SRB is by the same user plane channel transfer, alternatively, each corresponding SRB establishes one User plane channel, is transmitted respectively, correspondingly, the upstream or downstream channel information distributed is each corresponding SRB；

Corresponding each Data Radio Bearer DRB, the radio bearer configuration message include the data feedback channel information of CU distribution；It is right Should other RRC informations in addition to SRB0 by the method for user-plane transmissions, it is SRB that the radio bearer configuration message, which includes CU, The data feedback channel information of distribution, the communication information is corresponding each SRB or RRC information passes on all SRB other than SRB0 Defeated common channel；The data feedback channel information includes transport Layer address and TEID；

And/or the RB information for UE configuration includes the configuration information of SRB and DRB；Each corresponding DRB, the message package The down going channel information of the distribution containing T-DU；Method of other RRC informations in addition to SRB0 by user-plane transmissions is corresponded to, it is described Message includes the down going channel information that T-DU is SRB distribution, and the communication information is corresponding each SRB or the institute other than SRB0 There is RRC information on SRB to transmit common channel；The channel information includes transport Layer address and TEID.

9. according to the described in any item methods of claim 6 to 8, it is characterised in that:

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；

The CU sends data to the purpose DU

That the CU not confirms the UE and be sent to the purpose DU from the data that UPF is received, the data are point Group data convergence protocol protocol Data Unit PDCP PDU；Alternatively,

If T-DU and S-DU have identical RB to configure, data hair that is that the CU not confirms the UE and being received from UPF The purpose DU is given, the data are PDCP PDU, and the wireless spread-spectrum technology RLC context of source is sent to purpose by source DU DU；The PDCP PDU that corresponding part is successfully transmitted, purpose DU only send RLC PDU that UE is not received to UE；The CU is received One message of RLC context transfer that the source DU is sent；The CU sends two message of RLC context transfer to the purpose DU；

It include: the CU that CU is UE distribution in one message of RLC context transfer and two message of RLC context transfer UE AP ID, source DU are that DU UE AP ID, the RLC of UE distribution send state and/or PDCP transmits and receives state；Wherein, described RLC send state include the last one be successfully transmitted GTP-U data packet SN, the failed SN for sending GTP-U data packet and/or The RLC SN sent not successfully.

10. a kind of switching method of UE, which is characterized in that the source DU and purpose DU of the switching correspond to the same CU, this method Include:

Source DU receives measurement report message from UE, the source DU by user plane channel between CU or control plane channel to The CU sends the measurement report message；

The source DU is received the RRC connection reconfiguration that the CU is sent and set by the user plane channel or control plane channel to disappear Breath, and receive 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.

11. a kind of cut-in method of UE, which is characterized in that the UE is accessed by DU-1 and DU-2, the DU-1 and DU-2 pairs The same CU is answered, this method comprises:

CU receives the measurement report message that UE issues base station by user plane channel between DU-1 or control plane channel；

After a part of DRB or all DRB of UE are switched to DU-2 by the CU determination, radio bearer configuration is sent to DU-2 and is disappeared Breath；

The CU receives the radio bearer configuration response message that the DU-2 is sent；

The CU sends RRC connection reconfiguration by the user plane channel or control plane channel and sets message to the DU-1；

The CU sends data to the DU-2, and after UE is synchronized to purpose cell, the CU receives the DU-2 and passes through user The RRC connection setup complete message that plane channel or control plane channel are sent；The RRC connection setup complete message is described UE is sent to the base station；

The CU sends UE context release message to the DU-1.

12. according to the method for claim 11, it is characterised in that:

The radio bearer configuration message includes one of following information or multiple combinations: CU is the CU UE AP of UE distribution ID, UE the contextual information of DU-1, purpose cell ID, the RB information to be configured in DU-2, physical channel configuration information, The instruction that the configuration information of transmission channel, the configuration information of logic channel, data feedback channel information, MBB switch；Wherein, corresponding every One DRB, the radio bearer configuration message include the data feedback channel information of CU distribution；The channel information is comprising transport layer Location and TEID；

Include one of following information or multiple combinations in the radio bearer configuration response message: CU is the CU of UE distribution UE AP ID, DU-2 are DU UE AP ID of UE distribution, are the RB information of UE configuration；

And/or it is the CU UE that UE is distributed that one or more combinations of following information are sent to the DU-1:CU by the CU AP ID, DU-1 are DU UE AP ID of UE distribution, the RRC connection reconfiguration sets message, send the logic channel letter of RRC information The instruction that breath, the information that switch the RB walked, MBB switch.