WO2013185618A1

WO2013185618A1 - User plane data transmission method, system and device

Info

Publication number: WO2013185618A1
Application number: PCT/CN2013/077184
Authority: WO
Inventors: 焦斌; 鲍炜; 杨义
Original assignee: 电信科学技术研究院
Priority date: 2012-06-13
Filing date: 2013-06-13
Publication date: 2013-12-19
Also published as: CN103491580A

Abstract

An embodiment of the present application relates to the technical field of wireless communications, in particular to a user plane data transmission method, system and device, for solving the problem in the prior art that an RN cannot continue providing normal services for a UE residing in an RN Cell when the RN replaces a DeNB. The method in the embodiment of the present application comprises: during the switching process of an RN device, a source eNB determines that the target eNBs are respectively the downlink data forwarding tunnels allocated by each ERAB of the RN device; the source eNB forwards the ERAB downlink user plane data of the UE via the downlink data forwarding tunnels, the UE being the UE of a cell accessed and managed by the RN device. The embodiment of the present application realizes no data loss during the process of switching an RN device from a source serving DeNB to a target DeNB, and ensures that the RN can provide service without interruption for a UE in a RN Cell during the process of switching the RN device from a source DeNB to a target DeNB.

Description

Method, system and device for transmitting user plane data The application claims to be submitted to the Chinese Patent Office on June 13, 2012, the application number is 201210195029.0, and the invention name is "a method, system and device for transmitting user plane data". Priority of Chinese Patent Application, the entire contents of which is incorporated herein by reference. Technical field

The present invention relates to the field of wireless communication technologies, and in particular, to a method, system and device for transmitting user plane data. In the relay node (RN) system architecture, when the user plane architecture and the donor enhanced base station (DeNB) process data, the user plane downlink data tunnel is per user equipment (User Equipment). , UE) The granularity of each evolved E-UTRAN Radio Access Bearer (ERAB) (Per UE Per ERAB), that is, the network will be accessed for each access from the RN Each ERAB of the UE uniquely allocates a pair of General Packet Radio Service (GPRS) Tunneling Protocol Tunnel (GTP Tunnel). For the downlink data, the DeNB receives the downlink user plane GTP Tunnel data from the Serving GW (SGW), replaces the GTP header (header) according to the UE user plane context saved by itself, and sends the newly generated GTP Tunnel data to the RN. After receiving the uplink user plane GTP tunnel data from the RN, the DeNB replaces the GTP header according to the UE user plane context saved by the RN, and sends the newly generated GTP tunnel data to the SGW.

If the RN needs to replace the DeNB, the RN first offloads all UEs residing in the RN cell to other neighboring cells, after which the RN will close the RN cell and disconnect the network. The RN will then reselect a new DeNB and re-execute the RN boot process. It can be seen that the RN cannot guarantee the normal service for the UEs camped on the RN during the process of replacing the DeNB.

The current relay node is designed for a fixed scenario, and does not support seamless mobility of the RN. In the process of the RN switching from the source serving DeNB to the target DeNB, packet loss or packet repetition occurs. Therefore, the RN replaces the DeNB. The RN cannot continue to provide normal services for UEs camped under the RN Cell.

In summary, the RN may not perform the problem of packet loss or packet repetition in the process of the RN switching from the source serving DeNB to the target DeNB. During the RN replacement of the DeNB, the RN cannot continue to provide normal services for the UE camped on the RN Cell. SUMMARY OF THE INVENTION A method, system, and device for transmitting user plane data provided by an embodiment of the present invention are used to solve the problem that the RN cannot continue to provide normal services for the UE camped on the RN cell in the process of replacing the DeNB in the RN. problem. A method for transmitting user plane data provided by an embodiment of the present invention includes:

The source base station determines, in the process of the relay node RN device handover, a downlink data forwarding tunnel allocated by the target base station to each ERAB of the RN device;

The source base station forwards the downlink user plane data of the ERAB of the user equipment by using the downlink data forwarding tunnel, where the user equipment is a user equipment that accesses the cell managed by the RN device.

Another method for transmitting user plane data provided by an embodiment of the present invention includes:

The target base station allocates a downlink data forwarding tunnel for each ERAB of the RN device in the relay node RN device handover process;

The target base station receives the downlink user plane data of the ERAB of the user equipment forwarded by the source base station by using the downlink data forwarding tunnel of the ERAB of the RN device;

The user equipment is a user equipment that accesses a cell managed by the RN device.

A base station for transmitting user plane data according to an embodiment of the present invention includes:

a determining module, configured to determine, in a relay node RN device handover process, a downlink data forwarding tunnel allocated by the target base station to each ERAB of the RN device;

a first transmission module, configured to forward downlink user plane data of the ERAB of the user equipment by using the downlink data forwarding tunnel;

Another base station for transmitting user plane data provided by the embodiment of the present invention includes:

An allocating module, configured to allocate a downlink data forwarding tunnel for each ERAB of the RN device during the RN device handover process;

a second transmission module, configured to receive downlink user plane data of the ERAB of the user equipment forwarded by the source base station by using a downlink data forwarding tunnel of the ERAB of the RN device;

A system for transmitting user plane data provided by an embodiment of the present invention includes:

a source base station, configured to determine, in a relay node RN device handover process, a downlink data forwarding tunnel that is allocated to each ERAB of the RN device by the target base station, and forward the downlink user plane of the ERAB of the user equipment by using the downlink data forwarding tunnel The user equipment is a user equipment that accesses a cell managed by the RN device, and the target base station is configured to allocate a downlink data forwarding tunnel to each ERAB of the RN device during the RN device handover process. The downlink data forwarding tunnel of the ERAB of the RN device receives the downlink user plane data of the ERAB of the user equipment forwarded by the source base station.

A base station for transmitting user plane data, the base station comprising:

a first processor, configured to determine, in a relay node RN device handover process, a downlink data forwarding tunnel allocated by the target base station to each evolved universal terrestrial wireless network radio access bearer ERAB of the RN device; a first signal transceiving device, configured to forward downlink user plane data of the ERAB of the user equipment by using the downlink data forwarding tunnel;

A base station for transmitting user plane data, the base station comprising:

a second processor, configured to allocate a downlink data forwarding tunnel for each evolved universal terrestrial wireless network radio access bearer ERAB of the RN device during the RN device handover process;

a second signal transceiving device, configured to receive downlink user plane data of an ERAB of the user equipment that is forwarded by the source base station by using a downlink data forwarding tunnel of the ERAB of the RN device;

In the embodiment of the present invention, the source base station forwards the downlink user plane data of the ERAB of the user equipment through the downlink data forwarding tunnel of each ERAB of the RN device, thereby implementing data loss of the RN device switching from the source service De B to the target De B process. In the process of the RN device switching from the source DeNB to the target DeNB, the RN can provide services for the UE in the RN Cell without interruption. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a schematic structural diagram of a system for transmitting user plane data according to an embodiment of the present invention;

2A is a schematic structural diagram of a source base station in a system for transmitting user plane data according to an embodiment of the present invention;

2B is a schematic structural diagram of another source base station in a system for transmitting user plane data according to an embodiment of the present invention; FIG. 3 is a schematic structural diagram of a target base station in a system for transmitting user plane data according to an embodiment of the present invention;

3B is a schematic structural diagram of another target base station in a system for transmitting user plane data according to an embodiment of the present invention; FIG. 4 is a schematic flowchart of a method for transmitting source plane data by a source base station according to an embodiment of the present invention;

5 is a schematic flowchart of a method for transmitting user plane data by a target base station according to an embodiment of the present invention;

6 is a schematic diagram of user plane data routing in a handover process according to an embodiment of the present invention;

7A is a schematic diagram of a user plane protocol stack before switching according to an embodiment of the present invention;

7B is a schematic diagram of a user plane protocol stack in a handover process according to an embodiment of the present invention;

7C is a schematic diagram of a user plane protocol stack after a user plane path is switched to a target side according to an embodiment of the present invention; FIG. 8 is a schematic flowchart of a method for a target base station to obtain a context of a user equipment from an RN according to an embodiment of the present invention; A schematic flowchart of a method for a target base station to obtain a context of a user equipment from a source base station. In the embodiment of the present invention, the source base station forwards the downlink data plane of the ERAB of the user equipment to the downlink data forwarding tunnel allocated by each of the ERAs of the RN equipment by the target base station in the relay node RN device handover process. The user equipment is a user equipment that accesses a cell managed by the RN device. The source base station is connected in the embodiment of the present invention. The downlink data forwarding tunnel of each ERAB of the RN device forwards the downlink user plane data of the ERAB of the user equipment, thereby implementing data loss of the RN device switching from the source service De B to the target De B process, ensuring that the RN is from the source DeNB. During the handover to the target DeNB, the RN device can provide services for the UEs in the RN Cell without interruption.

The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

In the following description, the implementation of the cooperation between the source base station and the target base station will be described first, and finally the implementation of the source base station and the target base station will be respectively described, but this does not mean that the two must cooperate with the implementation. In fact, the source When the base station and the target base station are implemented separately, the problems existing in the source base station and the target base station are also solved, but when the two are combined, better technical effects are obtained.

As shown in FIG. 1, a system for transmitting user plane data according to an embodiment of the present invention includes: a source base station 10 and a target base station 20. The source base station 10 is configured to determine, in the RN device handover process, that the target base station 20 is each of the RN devices respectively.

a downlink data forwarding tunnel allocated by the ERAB; forwarding the downlink user plane data of the ERAB of the user equipment by using the downlink data forwarding tunnel, where the user equipment is a user equipment that accesses the cell managed by the RN device;

The target base station 20 is configured to allocate a downlink data forwarding tunnel to each ERAB of the RN device during the RN device handover process, and receive the ERAB of the user equipment forwarded by the source base station 10 by using the downlink data forwarding tunnel of the ERAB of the RN device. Downstream user plane data.

In the RN handover preparation phase, the source base station allocates a data tunnel for each ERAB of each UE between the RNs that need to perform handover, that is, allocates a data tunnel with a Per UE Per ERAB granularity, and performs user plane data forwarding. .

In an implementation, after the RN device disconnects from the source base station 10 in the data forwarding phase of the RN device handover process, the source base station 10 notifies the target base station 20 to allocate a downlink forwarding tunnel by using a handover preparation procedure for the RN device; The base station 20 allocates a downlink data forwarding tunnel (ie, a downlink data forwarding tunnel with granularity allocated by Per RN Per ERAB) to each ERAB of the RN device between the source base station 10 and the target base station 20 for carrying Per UE Per ERAB. (i.e., carrying the downlink user plane data of each ERAB of each user equipment); then the target base station 20 notifies the source base station 10 of the identity of the downlink data forwarding tunnel of each ERAB of the RN device; the source base station 10 can Determine the corresponding downstream data forwarding tunnel.

Since the target base station 20 allocates one downlink data forwarding tunnel to each ERAB of the RN device that performs handover, when forwarding the downlink user plane data of the REAB of the user equipment, the source base station 10 needs to first determine which downlink data to forward the tunnel through. send.

There are many ways to select the downlink data forwarding tunnel, such as random selection, sequential selection according to the downlink data forwarding tunnel, and resource selection according to the downlink data forwarding tunnel.

Preferably, the source base station 10 can select a downlink data forwarding tunnel according to a Quality of Service (QoS) QoS class identifier (QCI) attribute.

Specifically, for a REAB of a user equipment, the source base station 10 QCI of the ERAB of the user equipment Attributes are compared with the QCI attributes of each ERAB of the RN device, and the ERAB of the RN device corresponding to the ERAB of the user equipment is determined according to the comparison result;

The source base station 10 transmits the downlink user plane data of the ERAB of the user equipment through the downlink data forwarding tunnel of the corresponding ERAB of the RN device.

Taking an ERAB of a user equipment as an example, the source base station 10 searches for an ERAB of the same or similar QCI attribute of the ERAB of the RN device from the QCI attribute of each ERAB of the RN device, and the RN device of the RN device The downlink user plane data of the ERAB is mapped to the downlink data forwarding tunnel corresponding to the found ERAB.

QCI attributes include, but are not limited to, at least one of the following attributes:

Maximum delay, bit error rate, guaranteed data rate indication, priority.

In the implementation, how to find the ERAB with the same or similar QCI attributes can be set according to the needs, and can also be based on the operator's policy. For example, the operator can decide which QCI level to use (the current standard defines 9 QCIs). For details, refer to the 3GPP TS 23.203 protocol. For example, the Guaranteed Bit Rate (GBR) and the Non-Guarantee Bit Rate (Non-GBR) UE ERAB can be mapped to different RN ERABs. The corresponding downlink data forwarding tunnel may also be mapped to the downlink data forwarding tunnel corresponding to different RN ERABs from the perspective of delay, for example, UE ERABs with delay requirements of 50 ms, 100 ms, and 300 ms, respectively.

Preferably, the source base station 10 determines, in the RN device handover process, the uplink data forwarding tunnel allocated by the target base station 20 to some or all of the ERABs of the RN device, and forwards the uplink user plane data of the ERAB of the user equipment through the uplink data forwarding tunnel. The user equipment is a user equipment that accesses a cell managed by the RN device;

Correspondingly, the target base station 20 allocates an uplink data forwarding tunnel to some or all of the ERAs of the RN device during the RN device handover process, and receives the ERAB of the user equipment forwarded by the source base station 10 through the uplink data forwarding tunnel of the ERAB of the RN device. Upstream user plane data.

Preferably, when the target base station 20 determines that there is uplink user plane data, the target base station 20 allocates a tunnel identifier for the uplink forwarding tunnel, and notifies the source base station 10 of the tunnel identifier.

In an implementation, after the RN device disconnects from the source base station 10 in the data forwarding phase in the RN device handover process, the source base station 10 passes between the source base station 10 and the target base station 20 through a handover preparation procedure for the RN device. For this

Each ERAB of the RN device allocates an uplink data forwarding tunnel (ie, an uplink data forwarding tunnel allocated with Per RN Per ERAB granularity) for carrying the uplink of Per UE Per ERAB (ie, each ERAB carrying each user equipment). User plane data; then the target base station 20 notifies the source base station 10 of the identity of the uplink data forwarding tunnel of each ERAB of the RN device; the source base station 10 can determine the corresponding uplink data forwarding tunnel according to the identifier.

Since the target base station 20 allocates an uplink data forwarding tunnel to each ERAB of the RN device that performs handover, when forwarding the uplink user plane data of the REAB of the user equipment, the source base station 10 needs to first determine which uplink data to forward the tunnel through. send.

The manner of selecting the uplink data forwarding tunnel is similar to the manner of selecting the downlink data forwarding tunnel, and is not here. Let me repeat.

Preferably, for a REAB of a user equipment, the source base station 10 compares the QCI attribute of the ERAB of the user equipment with the QCI attribute of each ERAB of the RN device, and determines the ERAB corresponding to the user equipment according to the comparison result. The ERAB of the RN device transmits the uplink user plane data of the ERAB of the user equipment through the corresponding uplink data forwarding tunnel of the ERAB of the RN device.

The manner of selecting the uplink data forwarding tunnel according to the QCI attribute is similar to the method of selecting the downlink data forwarding tunnel according to the QCI attribute, and details are not described herein again.

Preferably, after the RN device accesses, the target base station 20 transmits the downlink user plane data received from the downlink data forwarding tunnel to the RN device through the air interface between the RN device and the target base station 20.

During the RN device handover process, the target base station 20 can obtain the uplink and downlink information of the user equipment through the RN device or the source base station. The description is separately made below.

Case 1: The target base station 20 acquires uplink and downlink information of the user equipment by using the RN device.

Specifically, the target base station 20 receives the context information of the user equipment from the RN device that accesses the cell managed by the RN device and is in the connected state during the RN device handover process.

Case 2: The target base station 20 acquires the uplink and downlink information of the user equipment through the target base station 20.

Specifically, the target base station 20 receives the user equipment identification information and the source base station identification information from the RN device, and sends the user equipment identification information to the source base station corresponding to the source base station identification information.

After receiving the user equipment identification information from the target base station, the source base station 10 transmits the context information of the user equipment corresponding to the user equipment identification information to the target base station 20;

The target base station 20 receives context information from the user equipment of the source base station 10.

The UE identification information in the embodiment of the present invention is information that uniquely identifies the UE, such as an S1 application protocol identifier (S1AP ID) of the UE.

In an implementation, after acquiring the uplink and downlink information of the user equipment, the target base station 20 determines a Mobility Management Entity (MME) serving the corresponding user equipment according to the context information, and initiates a path handover procedure to the determined MME, and notifies the MME. The user plane path and the control plane path of the corresponding user equipment are converted to the target device.

The embodiment of the present invention can implement data lossless in the RN handover process, and ensure that the UE in the connected state of the cell managed by the RN can continue to work normally after the RN is handed over to the target base station.

Preferably, in the embodiment of the present invention, after the user plane path is switched to the target device, the downlink forwarding tunnel and/or the uplink forwarding tunnel for the RN may also be released. The specific release process can be referred to the 3GPP TS 36.423 and TS 36.413 protocols and will not be described here.

The source base station and the target base station in the embodiment of the present invention may be a macro base station (such as an evolved base station, a donor enhanced base station), a home base station, and the like. As shown in FIG. 2A, the source base station in the system for transmitting user plane data according to the embodiment of the present invention includes: a determining module 200 and a first transmitting module 210.

a determining module 200, configured to determine, in the RN device handover process, a downlink data forwarding tunnel allocated by the target base station to each ERAB of the RN device;

The first transmission module 210 is configured to forward downlink user plane data of the ERAB of the user equipment by using a downlink data forwarding tunnel;

Preferably, for a REAB of a user equipment, the first transmission module 210 compares the QCI attribute of the ERAB of the user equipment with the QCI attribute of each ERAB of the RN device, and determines the user equipment according to the comparison result. The ERAB of the RN device corresponding to the ERAB; the downlink user plane data of the ERAB of the user equipment is transmitted through the downlink data forwarding tunnel of the ERAB of the corresponding RN device.

Preferably, the determining module 200 determines, in the RN device handover process, an uplink data forwarding tunnel allocated by the target base station to a part of the RN device or all ERABs;

Correspondingly, the first transmission module 210 forwards the uplink user plane data of the ERAB of the user equipment by using the uplink data forwarding tunnel. The user equipment is the user equipment of the cell managed by the RN device.

Preferably, for a REAB of a user equipment, the first transmission module 210 compares the QCI attribute of the ERAB of the user equipment with the QCI attribute of each ERAB of the RN device, and determines the user equipment according to the comparison result. The ERAB of the RN device corresponding to the ERAB; the uplink user plane data of the ERAB of the user equipment is forwarded through the corresponding uplink data forwarding tunnel of the ERAB of the RN device.

Preferably, the base station of the embodiment of the present invention may further include: a first processing module 220.

The first processing module 220 is configured to send the context information of the user equipment corresponding to the user equipment identification information to the target base station after receiving the user equipment identification information from the target base station in the RN device handover process.

In an implementation, the determining module 200 may specifically be a processor, and the first transmitting module 210 and the first processing module 220 may be signal transmitting and receiving devices, including a transceiver antenna and the like. At this time, as shown in FIG. 2B, the source base station in the system for transmitting user plane data according to the embodiment of the present invention includes: a first processor 2000 and a first signal transceiving device 2100.

The first processor 2000 is configured to determine, in the RN device handover process, a downlink data forwarding tunnel allocated by the target base station to each ERAB of the RN device;

The first signal transceiver device 2100 is configured to forward downlink user plane data of the ERAB of the user equipment by using a downlink data forwarding tunnel;

Preferably, for a REAB of a user equipment, the first signaling device 2100 compares the QCI attribute of the ERAB of the user equipment with the QCI attribute of each ERAB of the RN device, and determines the user equipment according to the comparison result. The ERAB of the RN device corresponding to the ERAB; the downlink user plane of the ERAB of the user equipment The data is transmitted through the corresponding downlink data forwarding tunnel of the ERAB of the RN device.

Preferably, the first processor 2000 determines, in the RN device handover process, an uplink data forwarding tunnel allocated by the target base station to some or all of the ERABs of the RN device;

Correspondingly, the first signal transceiving device 2100 forwards the uplink user plane data of the ERAB of the user equipment through the uplink data forwarding tunnel. The user equipment is the user equipment of the cell managed by the RN device.

Preferably, for a REAB of a user equipment, the first signaling device 2100 compares the QCI attribute of the ERAB of the user equipment with the QCI attribute of each ERAB of the RN device, and determines the user equipment according to the comparison result. The ERAB of the RN device corresponding to the ERAB; the uplink user plane data of the ERAB of the user equipment is forwarded through the corresponding uplink data forwarding tunnel of the ERAB of the RN device.

Preferably, the first signal transceiving device 2100 is further configured to: after receiving the user equipment identification information from the target base station in the RN device handover process, send the context information of the user equipment corresponding to the user equipment identification information to the target base station.

As shown in FIG. 3A, the target base station in the system for transmitting user plane data according to the embodiment of the present invention includes: an allocation module 300 and a second transmission module 310.

The allocating module 300 is configured to allocate a downlink data forwarding tunnel to each ERAB of the RN device during the RN device handover process;

The second transmission module 310 is configured to receive, by using a downlink data forwarding tunnel of the ERAB of the RN device, downlink user plane data of the ERAB of the user equipment that is forwarded by the source base station;

Preferably, the allocating module 300 allocates an uplink data forwarding tunnel to some or all of the ERABs of the RN device during the handover process of the relay node RN device; and receives the user forwarded by the source base station through the uplink data forwarding tunnel of the ERAB of the RN device. The uplink user plane data of the ERAB of the device; wherein, the user equipment is a user equipment that accesses a cell managed by the RN device.

Preferably, the second transmission module 310 receives the context information of the user equipment from the RN device that accesses the cell managed by the RN device and is in the connected state during the RN device handover process.

Preferably, the second transmission module 310 receives the user equipment identification information and the source base station identification information from the RN device during the RN device handover process, and sends the user equipment identification information to the source base station corresponding to the source base station identification information, and receives the Context information of the user equipment of the source base station.

Preferably, the base station of the embodiment of the present invention may further include: a second processing module 320.

The second processing module 320 is configured to determine, according to the context information, an MME that is served by the corresponding user equipment, and initiate a path switching process to the determined MME, and notify the MME to convert the user plane path and the control plane path of the corresponding user equipment to the target device.

Preferably, after the RN device accesses, the second transmission module 310 receives the downlink from the downlink data forwarding tunnel. The user plane data is sent to the RN device through an air interface between the RN device and the target base station.

In an implementation, a different scenario base station may serve as a source base station or a target base station, so the functions of the source base station in FIG. 2 and the target base station in FIG. 3 may be combined in one base station (ie, the source base station and the diagram in FIG. 2). The module of the target base station in 3 is in a base station, and the function of the source base station or the function of the target base station is selected as needed.

In an implementation, the allocating module 300 may specifically be a processor, and the second transmitting module 310 and the second processing module 320 may be signal transmitting and receiving devices, including a transceiver antenna and the like. At this time, as shown in FIG. 3B, the target base station in the system for transmitting user plane data according to the embodiment of the present invention includes: a second processor 3000 and a second signal transceiving device 3100.

The second processor 3000 is configured to allocate a downlink data forwarding tunnel to each ERAB of the RN device during the RN device handover process;

The second signal transceiving device 3100 is configured to receive downlink user plane data of the ERAB of the user equipment forwarded by the source base station by using a downlink data forwarding tunnel of the ERAB of the RN device;

Preferably, the second processor 3000 allocates an uplink data forwarding tunnel to some or all of the ERAs of the RN device during the relay node RN device handover process; the second signal transceiver device 3100 is further configured to: pass the RN device The uplink data forwarding tunnel of the ERAB receives the uplink user plane data of the ERAB of the user equipment forwarded by the source base station, where the user equipment is the user equipment of the cell managed by the access RN device.

Preferably, the second signal transceiving device 3100 receives the context information of the user equipment from the RN device that accesses the cell managed by the RN device and is in the connected state during the RN device handover process.

Preferably, the second signal transceiving device 3100 receives the user equipment identification information and the source base station identification information from the RN device during the RN device handover process, and sends the user equipment identification information to the source base station corresponding to the source base station identification information, and receives Context information of the user equipment from the source base station.

Preferably, the second signal transceiving device 3100 is further configured to: determine an MME serving the corresponding user equipment according to the context information; initiate a path switching procedure to the determined MME, and notify the MME to use the user plane path and the control plane of the corresponding user equipment. The path is converted to the target device.

Preferably, after the RN device accesses, the second signal transceiving device 3100 transmits the downlink user plane data received from the downlink data forwarding tunnel to the RN device through an air interface between the RN device and the target base station.

In an implementation, different scenario base stations may serve as the source base station or the target base station, so the functions of the source base station in FIG. 2A/FIG. 2B and the target base station in FIG. 3A/FIG. 3B may be combined in one base station (ie, FIG. 2A). / The source base station in FIG. 2B and the module of the target base station in FIG. 3A/FIG. 3B are in one base station), and the function of the source base station or the function of the target base station is selected as needed.

As shown in FIG. 4, the method for transmitting source plane data by a source base station in the embodiment of the present invention includes the following steps: Step 401: The source base station determines, in the RN device handover process, that the target base station allocates downlinks for each ERAB of the RN device respectively. Data forwarding tunnel; Step 402: The source base station forwards the downlink user plane data of the ERAB of the user equipment by using the downlink data forwarding tunnel. The user equipment is the user equipment of the cell managed by the RN device.

In an implementation, after the RN device disconnects from the source base station in the data forwarding phase of the RN device handover process, the source base station notifies the target base station 20 to allocate a downlink forwarding tunnel by using a handover preparation procedure for the RN device; A downlink data forwarding tunnel (ie, a downlink data forwarding tunnel with granularity allocated by Per RN Per ERAB) is allocated to each ERAB of the RN device between the source base station and the target base station, and is used to carry Per UE Per ERAB (ie, each bearer) The downlink user plane data of each ERAB of the user equipment; the target base station then notifies the source base station of the identifier of the downlink data forwarding tunnel of each ERAB of the RN device; the source base station can determine the corresponding downlink data forwarding tunnel according to the identifier.

The target base station allocates a downlink data forwarding tunnel for each ERAB of the RN device to be switched. Therefore, when forwarding the downlink user plane data of the REAB of the user equipment, the source base station needs to first determine which downlink data forwarding tunnel to transmit.

Preferably, the source base station can select a downlink data forwarding tunnel according to the QCI attribute.

Specifically, for a REAB of a user equipment, the source base station compares the QCI attribute of the ERAB of the user equipment with the QCI attribute of each ERAB of the RN device, and determines, according to the comparison result, the ERAB corresponding to the user equipment. ERAB of the RN device;

The source base station transmits the downlink user plane data of the ERAB of the user equipment through the downlink data forwarding tunnel of the corresponding ERAB of the RN device.

Preferably, the source base station determines, in the RN device handover process, the uplink data forwarding tunnel allocated by the target base station to some or all of the ERAs of the RN device, and forwards the uplink user plane data of the ERAB of the user equipment by using the uplink data forwarding tunnel; The user equipment is a user equipment that accesses a cell managed by the RN device.

In an implementation, after the RN device disconnects from the source base station in the data forwarding phase of the RN device handover process, the source base station is the RN device between the source base station and the target base station by using a handover preparation procedure for the RN device. Each ERAB allocates an uplink data forwarding tunnel (ie, an uplink data forwarding tunnel with granularity allocated by Per RN Per ERAB) for carrying the uplink user plane of Per UE Per ERAB (ie, each ERAB carrying each user equipment) Data; the target base station then notifies the source base station of the identity of the uplink data forwarding tunnel of each ERAB of the RN device; the source base station can determine the corresponding uplink data forwarding tunnel according to the identifier.

The target base station allocates one uplink data forwarding tunnel for each ERAB of the RN device that performs handover. Therefore, when forwarding the uplink user plane data of the REAB of the user equipment, the source base station needs to first determine which uplink data forwarding tunnel to transmit.

The manner of selecting the uplink data forwarding tunnel is similar to the manner of selecting the downlink data forwarding tunnel, and details are not described herein.

Preferably, after receiving the user equipment identification information from the target base station, the source base station sends the context information of the user equipment corresponding to the user equipment identification information to the target base station.

As shown in FIG. 5, the method for transmitting the user plane data by the target base station in the embodiment of the present invention includes the following steps: Step 501: The target base station allocates downlink data for each ERAB of the RN device during the handover process of the relay node RN device. Forwarding tunnel

Step 502: The target base station receives downlink user plane data of the ERAB of the user equipment forwarded by the source base station by using a downlink data forwarding tunnel of the ERAB of the RN device.

Preferably, the target base station allocates an uplink data forwarding tunnel to some or all of the ERABs of the RN device during the RN device handover process;

The target base station receives the uplink user plane data of the ERAB of the user equipment forwarded by the source base station by using the uplink data forwarding tunnel of the ERAB of the RN device;

Preferably, after the RN device accesses, the target base station sends the downlink user plane data received from the downlink data forwarding tunnel to the RN device through an air interface between the RN device and the target base station.

During the RN device handover process, the target base station can obtain the uplink and downlink information of the user equipment by using the RN device or the source base station. The description is separately made below.

Case 1: The target base station acquires uplink and downlink information of the user equipment through the RN device.

Specifically, the target base station receives context information of the user equipment from the RN device that accesses the cell managed by the RN device and is in the connected state during the RN device handover process.

Case 2: The target base station acquires uplink and downlink information of the user equipment through the target base station.

Specifically, the target base station receives the user equipment identification information and the source base station identification information from the RN device in the RN device handover process, and sends the user equipment identification information to the source base station corresponding to the source base station identification information; After receiving the user equipment identification information from the target base station, the source base station sends the context information of the user equipment corresponding to the user equipment identification information to the target base station 20;

The target base station receives context information of the user equipment from the source base station.

In an implementation, after the target base station acquires the uplink and downlink information of the user equipment, the MME that is the service of the corresponding user equipment is determined according to the context information, and the path switching process is initiated to the determined MME, and the MME is notified to the user plane path and control of the corresponding user equipment. The surface path is converted to the target device.

The source base station and the target base station in the embodiments of the present invention may be a macro base station (such as an evolved base station, a donor enhanced base station), a home base station, and the like.

4 and FIG. 5 can synthesize a process to form a method for transmitting user plane data, that is, first performing step 401 and step 402, and then performing step 501 and step 502.

After the solution of the embodiment of the present invention is used, the user plane data routing process can be seen in FIG. 6.

In Figure 6, before the handover, the data path of the user plane is a source-donor enhanced base station (S-De B) - Serving GW (S-GW) of the RN device, and the protocol stack of the user plane before switching can be seen. Figure 7A. In FIG. 7A, the RN device includes a GTP, a User Datagram Protocol (UDP), an Internet Protocol (IP), and a Packet Data Convergence Protocol (PDCP). RLC), Medium Access Control (MAC) and Physical Layer (PHY), the service gateway includes GTP, UDP, IP, L2, and: LI, and the source-donor enhanced base station includes protocols in the RN device and the serving gateway.

In the handover process, the data path of the user plane is an RN device-target-enhanced base station (T-De B)-source-donor enhanced base station-S-GW. The protocol stack of the user plane before handover can be seen in FIG. 7B. As can be seen from FIG. 7B, the target-enhanced base station and the source-donor enhanced base station of the embodiment of the present invention implement data transmission through the corresponding GTP.

After the handover, the data path of the user plane is a target-donor enhanced base station-S-GW of the RN device, and the protocol stack of the user plane before the handover can be seen in FIG. 7C.

As shown in FIG. 8, the method for the target base station to obtain the context of the user equipment from the RN device in the embodiment of the present invention includes the following steps:

Step 801: The S-DeNB decides to switch the RN device to the T-DeNB according to the measurement report of the RN device to the air interface.

Step 802: The S-DeNB initiates a handover preparation message for the RN device to the T-DeNB, where the ERAB context information allocated by the Per RN device is carried.

Step 803: The T-DeNB returns a handover response message for the RN device.

Step 803 a: The T-DeNB according to the ERAB context information allocated by the Per RN device received from the S-DeNB, Per RN Per ERAB allocates a downlink data forwarding tunnel for granularity.

Step 804: The S-DeNB notifies the RN device to switch to the T-DeNB (such as an RRC Reconfig command). The S-DeNB maps the downlink user plane data of the Per UE Per ERAB to the data forwarding tunnel corresponding to the RN ERAB with the same or similar QCI attributes according to the QCI attribute of the UE ERAB, and the Per UE is forwarded through the data forwarding tunnel corresponding to the RN device ERAB. The downlink user plane data of the Per ERAB is transmitted to the T-DeNB.

The components of the UE ERAB here are allocated between the RN device and the S-DeNB (that is, the data tunnel between the RN device and the S-DeNB).

Step 805: After the RN device successfully accesses from the T-DeNB, the RRC configuration success (RRC Reconfig complete) message is returned.

If the T-DeNB receives the downlink forwarding data from the data forwarding tunnel allocated by using the Per RN Per ERAB granularity, the T-DeNB directly sends the forwarding data to the RN device through the air interface bearer.

Step 806: The RN device initiates an S1 interface establishment process to the T-DeNB.

For the specific S1 interface establishment process, refer to 3GPP TS 36.413, and details are not described herein.

Step 806a: The RN device sends the complete context information of the UE in the connected state of the cell managed by the RN device saved by the RN device to the T-DeNB through the "UE ContextSynchronization" process in the S1 interface establishment process, where each The UE context information includes, but is not limited to, at least one of the following information:

The MME information currently serving the UE, the ERAB list information allocated by the Per UE, and the S1AP ID information allocated by the RN device for this UE.

Preferably, the T-DeNB carries at least the S1AP information allocated by the T-DeNB for each UE in the response message.

In the implementation, there are two ways in the step 806a. The mode 1 enhances the existing S1 interface establishment process, and the UE ContextSynchronization function is completed in the S1 interface establishment process. Mode 2 introduces a new "UE ContextSynchronization" process. After the S1 interface setup process is completed, the RN device initiates a "UE ContextSynchronization" process.

Step 807: The T-DeNB initiates a path conversion process to the serving MME of the UE by using a Path Switch Request message, which is stored in the UE context, and converts the user plane and the control plane path of the UE. Go to T-De B.

In this message, the T-DeNB sends the downlink tunnel address assigned to the Per UE Per ERAB to the MME.

Step 808: The MME sends the downlink tunnel address allocated by the T-DeNB to the Per UE Per ERAB to the S-GW serving the corresponding UE by using the Modify Bearer Request message, and the S-GW will be the downlink user for the UE. The face tunnel is transferred to the T-DeNB.

As shown in FIG. 9, the method for the target base station to obtain the context of the user equipment from the source base station in the embodiment of the present invention includes the following steps: Step 901: The S-DeNB decides to switch the RN device to the T-DeNB according to the measurement report result of the RN device to the air interface.

Step 902: The S-DeNB initiates a handover preparation message for the RN device to the T-DeNB, where the ERAB context information allocated by the Per RN device is carried.

Step 903: The T-DeNB returns a handover response message for the RN device.

Step 903 a: The T-DeNB allocates a downlink data forwarding tunnel with a Per RN Per ERAB granularity according to the ERAB context information allocated by the Per RN device received from the S-DeNB.

Step 904: The S-DeNB notifies the RN device to switch to the T-DeNB (such as RRC Reconfig command). The S-DeNB maps the downlink user plane data of the Per UE Per ERAB to the data forwarding tunnel corresponding to the RN ERAB with the same or similar QCI attributes according to the QCI attribute of the UE ERAB, and the Per UE is forwarded through the data forwarding tunnel corresponding to the RN device ERAB. The downlink user plane data of the Per ERAB is transmitted to the T-DeNB.

Step 905: After successfully accessing the T-DeNB, the RN device returns an RRC Reconfig complete message.

Step 906: The RN device initiates an S1 interface establishment process to the T-DeNB.

Step 906a: The RN device passes the "UE state synchronization" process in the S1 interface allocation process, and the cell information managed by the RN device saved by the RN device is in the connection state de UE's identification information list and the S-DeNB. The identifier information is sent to the T-DeNB, where the UE identity information may be an S1AP ID allocated by the S-DeNB for the UE.

Step 907: The T-DeNB initiates a UE context acquisition process according to the identifier information list of the connection state of the RN and the identity information of the S-DeNB that the RN obtains according to the RN obtained in step 906.

Specifically, the T-DeNB carries the S1 AP ID allocated by the S-DeNB to the UE as the identification information of the UE in the request message sent to the S-DeNB. The S-DeNB sends the context list information of the corresponding UE to the T-DeNB through the response message according to the identity information of the UE.

Step 908: The T-DeNB initiates a path conversion process to the serving MME of the UE by using a "PathSwitchRequest" message according to the MME information stored in the UE context, and converts the user plane and the control plane path of the UE to the T-DeNB.

Step 909: The MME sends the downlink tunnel address allocated by the T-DeNB to the Per UE Per ERAB to the S-GW serving the corresponding UE by using the Modify Bearer Request message, and the S-GW will tunnel the downlink user plane for the UE. Transfer to T-De B.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present invention can be embodied in the form of a computer program product embodied on one or more computer-usable storage interfaces (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each process and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the preferred embodiment of the invention has been described, it will be apparent to those of ordinary skill in the art that <RTIgt; Therefore, the appended claims are intended to be construed as including the preferred embodiments and the modifications

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

Rights request

1. A method for transmitting user plane data, characterized in that the method includes:

During the handover process of the relay node RN device, the source base station determines the downlink data forwarding tunnel allocated by each evolved universal terrestrial wireless network radio access bearer ERAB of the target base station respectively;

The source base station forwards the downlink user plane data of the ERAB of the user equipment through the downlink data forwarding tunnel; wherein the user equipment is a user equipment that accesses a cell managed by the RN equipment.

2. The method of claim 1, wherein the source base station forwards the downlink user plane data of each REAB of each user equipment through the downlink data forwarding tunnel, including:

For a REAB of a user equipment, the source base station compares the QCI attribute of the ERAB of the user equipment with the QCI attribute of each ERAB of the RN equipment, and determines the QCI attribute of the user equipment based on the comparison result. The ERAB of the RN device corresponding to the ERAB;

The source base station sends the downlink user plane data of the ERAB of the user equipment through the corresponding downlink data forwarding tunnel of the ERAB of the RN equipment.

3. The method of claim 1, characterized in that, the method further includes:

During the handover process of the RN equipment, the source base station determines that the target base station is part or all of the RN equipment.

The upstream data forwarding tunnel allocated by ERAB;

The source base station forwards the uplink user plane data of the ERAB of the user equipment through the uplink data forwarding tunnel.

4. The method of claim 3, wherein the source base station forwards the uplink user plane data of the ERAB of the user equipment through the uplink data forwarding tunnel, including:

For a REAB of a user equipment, the source base station compares the QCI attribute of the ERAB of the user equipment with the QCI attribute of each ERAB of the RN equipment, and determines the RN corresponding to the ERAB of the user equipment based on the comparison result. ERAB of the device;

The source base station sends the uplink user plane data of the ERAB of the user equipment through the corresponding uplink data forwarding tunnel of the ERAB of the RN equipment.

5. The method according to any one of claims 1 to 4, characterized in that, the method further includes:

After receiving the user equipment identification information from the target base station during the RN equipment handover process, the source base station sends the context information of the user equipment corresponding to the user equipment identification information to the target base station.

6. A method for transmitting user plane data, characterized in that the method includes:

During the handover process of the relay node RN device, the target base station allocates downlink data forwarding tunnels to each evolved universal terrestrial wireless network radio access bearer ERAB of the RN device;

The target base station receives the user equipment forwarded by the source base station through the downlink data forwarding tunnel of the ERAB of the RN device.

ERAB’s downstream user plane data;

Wherein, the user equipment is a user equipment that accesses a cell managed by the RN equipment.

7. The method of claim 6, characterized in that, the method further includes:

During the handover process of the RN device, the target base station allocates uplink data forwarding tunnels to part or all of the ERAB of the RN device;

The target base station receives the uplink user plane data of the ERAB of the user equipment forwarded by the source base station through the uplink data forwarding tunnel of the ERAB of the RN equipment.

8. The method of claim 6, characterized in that, the method further includes:

During the handover process of the RN device, the target base station receives context information from the RN device of the user equipment that accesses the cell managed by the RN device and is in a connected state.

9. The method of claim 6, characterized in that, the method further includes:

During the RN equipment handover process, the target base station receives user equipment identification information and source base station identification information from the RN equipment;

The target base station sends the user equipment identification information to the source base station corresponding to the source base station identification information, and receives context information of the user equipment from the source base station.

10. The method according to claim 8 or 9, characterized in that, after the target base station receives the context information of the user equipment, it further includes:

The target base station determines the mobility management entity MME serving the corresponding user equipment according to the context information;

The target base station initiates a path switching process to the determined MME, and notifies the MME to switch the user plane path and control plane path of the corresponding user equipment to the target equipment.

11. The method according to any one of claims 6 to 9, characterized in that, the method includes:

After the RN device is accessed, the target base station sends the downlink user plane data received from the downlink data forwarding tunnel to the RN device through the air interface between the RN device and the target base station.

12. A base station that transmits user plane data, characterized in that the source base station includes:

The determination module is used to determine the downlink data forwarding tunnel allocated by each evolved universal terrestrial wireless network radio access bearer ERAB of the target base station respectively during the handover process of the relay node RN device;

The first transmission module is configured to forward the downlink user plane data of the ERAB of the user equipment through the downlink data forwarding tunnel;

13. The base station according to claim 12, characterized in that the first transmission module is specifically used to: for a REAB of a user equipment, identify the service shield level of the ERAB of the user equipment

Compare the QCI attribute with the QCI attribute of each ERAB of the RN equipment, and determine the ERAB of the RN equipment corresponding to the ERAB of the user equipment based on the comparison result; pass the downlink user plane data of the ERAB of the user equipment through the corresponding The downlink data forwarding tunnel of the ERAB of the RN device is sent.

14. The base station according to claim 12, wherein the determining module is further configured to: during the RN device handover process, determine the uplink data forwarding tunnels allocated by the target base station to part or all of the ERAB of the RN device;

The first transmission module is also used for:

The uplink user plane data of the ERAB of the user equipment is forwarded through the uplink data forwarding tunnel.

15. The base station according to claim 14, characterized in that the first transmission module is specifically configured to: for a REAB of a user equipment, according to the QCI attribute of the ERAB of the user equipment and each of the RN equipment Compare the QCI attributes of the ERABs, and determine the ERAB of the RN device corresponding to the ERAB of the user equipment based on the comparison result; forward the uplink user plane data of the ERAB of the user equipment through the uplink data of the corresponding ERAB of the RN device. Send through tunnel.

16. The base station according to any one of claims 12 to 15, characterized in that, the base station further includes:

The first processing module is configured to send the context information of the user equipment corresponding to the user equipment identification information to the target base station after receiving the user equipment identification information from the target base station during the RN equipment handover process.

17. A base station for transmitting user plane data, characterized in that the base station includes:

An allocation module configured to allocate downlink data forwarding tunnels to each evolved universal terrestrial wireless network radio access bearer ERAB of the RN equipment during the handover process of the RN equipment;

The second transmission module is configured to receive the downlink user plane data of the ERAB of the user equipment forwarded by the source base station through the downlink data forwarding tunnel of the ERAB of the RN equipment;

18. The base station according to claim 17, characterized in that the distribution module is also used for:

During the switching process of the relay node RN device, allocate uplink data forwarding tunnels to part or all of the ERAB of the RN device; receive the uplink user plane of the ERAB of the user equipment forwarded by the source base station through the uplink data forwarding tunnel of the ERAB of the RN device. data.

19. The base station of claim 17, wherein the second transmission module is further configured to: during an RN device handover process, receive a message from the RN device to access a cell managed by the RN device and be connected. Contextual information about the state of the user device.

20. The base station of claim 17, wherein the second transmission module is further configured to: receive user equipment identification information and source base station identification information from the RN equipment during the RN equipment handover process; The user equipment identification information is sent to the source base station corresponding to the source base station identification information, and context information of the user equipment from the source base station is received.

21. The base station according to claim 19 or 20, characterized in that, the base station further includes:

The second processing module is configured to determine the mobility management entity MME serving the corresponding user equipment according to the context information; initiate a path switching process to the determined MME, and notify the MME to transfer the user plane of the corresponding user equipment to Paths and control plane paths are translated to the target device.

22. The base station according to any one of claims 17 to 20, wherein the second transmission module is further configured to: after the RN device is accessed, receive the downlink user plane from the downlink data forwarding tunnel. The data is sent to the RN device through the air interface between the RN device and the target base station.

23. A system for transmitting user plane data, characterized in that the system includes:

The source base station is configured to determine the downlink data forwarding tunnel assigned by the target base station to each evolved universal terrestrial wireless network wireless access bearer ERAB of the RN device during the handover process of the relay node RN device; through the downlink data forwarding The tunnel forwards the downlink user plane data of the ERAB of the user equipment; wherein, the user equipment is accessed to the

User equipment of the cell managed by the RN equipment;

The target base station is used to allocate downlink data forwarding tunnels to each ERAB of the RN device during the handover process of the RN device, and receive the user equipment forwarded by the source base station through the downlink data forwarding tunnel of the ERAB of the RN device.

ERAB’s downstream user plane data.

24. A base station for transmitting user plane data, characterized in that the base station includes:

The first processor is configured to determine the downlink data forwarding tunnel allocated by each evolved universal terrestrial wireless network radio access bearer ERAB of the target base station respectively during the handover process of the relay node RN device;

The first signal transceiver is configured to forward the downlink user plane data of the ERAB of the user equipment through the downlink data forwarding tunnel;

25. The base station according to claim 24, wherein the first signal transceiver is specifically configured to: identify an REAB of a user equipment according to the service shield level of the ERAB of the user equipment.

26. The base station according to claim 24, characterized in that the first processor is also used to:

During the handover process of the RN device, determine the uplink data forwarding tunnels allocated by the target base station to part or all of the ERAB of the RN device;

The first signal transceiving device is also used for:

27. The base station according to claim 26, wherein the first signal transceiver is specifically configured to: for a REAB of a user equipment, combine the QCI attribute of the ERAB of the user equipment and the QCI attribute of the RN equipment. Compare the QCI attributes of each ERAB, and determine the ERAB of the RN equipment corresponding to the ERAB of the user equipment based on the comparison result; pass the uplink user plane data of the ERAB of the user equipment through the uplink data of the corresponding ERAB of the RN equipment. Send via forwarding tunnel.

28. The base station according to any one of claims 24 to 27, characterized in that the first signal transceiver is further configured to: after receiving the user equipment identification information from the target base station during the RN equipment handover process, The context information of the user equipment corresponding to the user equipment identification information is sent to the target base station.

29. A base station for transmitting user plane data, characterized in that the base station includes:

The second processor is configured to allocate downlink data forwarding tunnels to each evolved universal terrestrial wireless network radio access bearer ERAB of the RN device during the handover process of the RN device;

The second signal transceiver is configured to receive the downlink user plane data of the ERAB of the user equipment forwarded by the source base station through the downlink data forwarding tunnel of the ERAB of the RN equipment;

30. The base station according to claim 29, characterized in that the second processor is also used to:

During the switching process of the relay node RN device, uplink data forwarding tunnels are allocated to part or all of the ERAB of the RN device;

The second signal transceiving device is also configured to: receive the uplink user plane data of the ERAB of the user equipment forwarded by the source base station through the uplink data forwarding tunnel of the ERAB of the RN equipment.

31. The base station according to claim 29, wherein the second signal transceiver is further configured to: during the RN equipment handover process, receive a signal from the RN equipment to access a cell managed by the RN equipment and be in Contextual information about the user device's connection status.

32. The base station according to claim 29, wherein the second signal transceiver is further configured to: receive user equipment identification information and source base station identification information from the RN equipment during the RN equipment handover process; The user equipment identification information is sent to the source base station corresponding to the source base station identification information, and context information of the user equipment from the source base station is received.

33. The base station according to claim 31 or 32, wherein the second signal transceiver is further configured to: determine the mobility management entity MME serving the corresponding user equipment according to the context information;

The MME initiates a path switching process and notifies the MME to convert the user plane path and control plane path of the corresponding user equipment to the target equipment.

34. The base station according to any one of claims 29 to 32, characterized in that the second signal transceiver is further configured to: after the RN device is accessed, receive downlink users from the downlink data forwarding tunnel. The plane data is sent to the RN device through the air interface between the RN device and the target base station.