CN104969653B - Method and device for establishing wireless backhaul link - Google Patents

Abstract

The present invention provides a method and device for establishing a wireless backhaul link. The method includes: a second access network device establishes a wireless backhaul control plane connection with a first access network device; the second access network device receives a measurement report sent by the first access network device, and according to the obtained measurement report The measurement report sends a handover request to the first access network device, where the handover request is used to instruct the first access network device to separate the control plane and the user plane of the wireless backhaul; the second access network The device receives a handover response sent by the first access network device, where the handover response is sent after the first access network device separates the control plane and the user plane of the wireless backhaul. The embodiment of the present invention realizes the separation of the user plane and the control plane of the wireless backhaul.

Description

Method and device for establishing wireless backhaul link

technical field

Embodiments of the present invention relate to communication technologies, and in particular, to a method and device for establishing a wireless backhaul link.

Background technique

In order to cope with the growth of mobile data service traffic, operators have proposed scenarios of small cell deployment. High-density deployment of small cells brings difficulties to operators in deploying wired backhaul networks. Therefore, it is considered that small cells use wireless backhaul links, that is, small cells are connected to the core network through wireless links. These small stations connected to the core network through wireless links can be called wireless relay nodes (Relay Node, RN), RN and core network Mobile Management Entity (Mobile Management Entity, MME) or Serving Gateway (Serving Gateway, S-GW) ) communication, the donor base station (DonoreNodeB, DeNB) can act as a proxy node of the MME or the S-GW, and the RN communicates with the MME or the S-GW through the DeNB. When the RN communicates with the DeNB, it can be single-hop or multi-hop. The single-hop means that the RN directly establishes a wireless link with the DeNB, and the multi-hop means that the RN establishes a wireless link with the DeNB through other RNs.

In the prior art, in a multi-hop scenario, the control plane (that is, the S1-MME plane) and the user plane (that is, the S1-U plane) of the backhaul of the RN are not separated, that is, the control plane and the user plane may be single. Jump or control plane and user plane are multi-hop. However, if both adopt the multi-hop mode, the signaling transmission delay of the control plane is relatively large, which affects the system performance; if both adopt the single-hop mode, the data transmission efficiency of the user plane is poor.

SUMMARY OF THE INVENTION

In view of this, the embodiments of the present invention provide a method and device for establishing a wireless backhaul link, so as to solve the problem caused by the non-separation of the user plane and the control plane of the wireless backhaul in the prior art.

In a first aspect, a method for establishing a wireless backhaul link is provided, including:

The second access network device establishes a wireless backhaul control plane connection with the first access network device;

The second access network device receives a measurement report sent by the first access network device, and sends a handover request to the first access network device according to the measurement report, where the handover request is used to indicate the The first access network device separates the control plane and the user plane of the wireless backhaul;

The second access network device receives a handover response sent by the first access network device, where the handover response is sent after the first access network device separates the control plane and the user plane of the wireless backhaul.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the second access network device is an access network device used to instruct the first access network device to perform user plane handover;

The switching request is a user plane path switching request;

The sending a handover request to the first access network device according to the measurement report includes:

Determine according to the measurement report to switch the user plane of the wireless backhaul from the second access network device to the third access network device;

After determining to switch the user plane of the wireless backhaul from the second access network device to the third access network device, send a user plane path switching request to the first access network device, and the user plane path switching The request includes the information of the third access network device, so that the first access network device sends a user plane path switching request to the third access network device according to the information of the third access network device, and A user plane path switching response sent by the third access network device is received.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, after receiving the handover response sent by the first access network device, the method further includes:

The second access network device sends an indication message to the third access network device, where the indication message is used to indicate that the third access network device is the proxy node of the serving gateway S-GW, so that the third access network device is The third access network device forwards the user plane data between the first access network device and the second access network device.

With reference to the first possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the user plane path switching sent by the first access network device to the third access network device The request includes the IP address of the first access network device, so that the third access network device is the first access network device according to the IP address of the first access network device and the third access network device. The cell wireless network temporary identifier C-RNTI allocated by the access network device establishes a mapping relationship between the IP address of the first access network device and the C-RNTI of the first access network device, so that the third The access network device forwards the user plane data between the first access network device and the second access network device according to the mapping relationship.

With reference to the first aspect, in a fourth possible implementation manner of the first aspect, the second access network device is an access network device used to instruct the first access network device to perform a control plane handover;

The handover request is a control plane path handover request;

The sending a handover request to the first access network device according to the measurement report includes:

Determine, according to the measurement report, to switch the control plane of the wireless backhaul from the second access network device to the third access network device;

After determining to switch the control plane of the wireless backhaul from the second access network device to the third access network device, send a control plane path switching request to the first access network device, and the control plane path switching The request includes the information of the third access network device, so that the first access network device sends a control plane path switching request to the third access network device according to the information of the third access network device and A user plane path switching response sent by the third access network device is received.

With reference to the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner of the first aspect, the third access network device is further used as a proxy node of the mobility management entity MME; and,

The third access network device is further configured to determine the second access network device as a node for user plane separation, or, according to the measurement report of the first access network node, determine that a non-second access network device is User plane separation node.

In a second aspect, a method for establishing a wireless backhaul link is provided, including:

establishing a wireless backhaul control plane connection between the first access network device and the second access network device;

The first access network device sends a measurement report to the second access network device, and receives a handover request sent by the second access network device, where the handover request is based on the second access network device. sent by the measurement report;

The first access network device separates the control plane and the user plane of the wireless backhaul according to the handover request, and sends a handover response to the access network device after separation.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the second access network device is an access network device used to instruct the first access network device to perform user plane handover;

The handover request is a user plane path handover request, the user plane path handover request includes the information of the third access network device, and the user plane path handover request is the second access network device according to the The measurement report is sent after determining that the user plane of the wireless backhaul is switched from the second access network device to the third access network device;

The first access network device performs separation of the control plane and the user plane of the wireless backhaul according to the handover request, including:

The first access network device sends a user plane path switching request to the third access network device according to the information of the third access network device and receives the user plane path switching sent by the third access network device response.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the handover response further enables the second access network device to send the handover response to the second access network device after receiving the handover response. The third access network device sends an indication message, where the indication message is used to indicate that the third access network device is a proxy node of the serving gateway S-GW, so that the third access network device forwards the third access network device. User plane data between an access network device and the second access network device.

With reference to the first possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the user plane path switching sent by the first access network device to the third access network device The request includes the IP address of the first access network device, so that the third access network device is the first access network device according to the IP address of the first access network device and the third access network device. The cell wireless network temporary identifier C-RNTI allocated by the access network device establishes a mapping relationship between the IP address of the first access network device and the C-RNTI of the first access network device, so that the third The access network device forwards the user plane data between the first access network device and the second access network device according to the mapping relationship.

With reference to the second aspect, in a fourth possible implementation manner of the second aspect, the second access network device is an access network device used to instruct the first access network device to perform a control plane handover;

The handover request is a control plane path handover request, the control plane path handover request includes information of a third access network device, and the control plane handover request is determined by the second access network device according to the measurement report Sent after the control plane of the wireless backhaul is switched from the second access network device to the third access network device;

The first access network device performs separation of the control plane and the user plane of the wireless backhaul according to the handover request, including:

The first access network device sends a control plane path switch request to the third access network device according to the information of the third access network device and receives a user plane path switch sent by the third access network device response.

With reference to the fourth possible implementation manner of the second aspect, in a fifth possible implementation manner of the second aspect, the third access network device is further used as a proxy node of the mobility management entity MME; and,

The third access network device is further configured to determine the second access network device as a node for user plane separation, or, according to the measurement report of the first access network node, determine that a non-second access network device is User plane separation node.

In a third aspect, an access network device is provided, where the access network device is a second access network device, and the device includes:

a processor, configured to establish a wireless backhaul control plane connection with the first access network device;

a transceiver, configured to receive a measurement report sent by the first access network device, and send a handover request to the first access network device according to the measurement report, where the handover request is used to instruct the first access network device The network access device separates the control plane and the user plane of the wireless backhaul;

The transceiver is further configured to receive a handover response sent by the first access network device, where the handover response is sent after the first access network device separates the control plane and the user plane of the wireless backhaul.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the second access network device is an access network device used to instruct the first access network device to perform user plane handover;

The switching request is a user plane path switching request;

The transceiver sends a handover request to the first access network device according to the measurement report, including:

Determine according to the measurement report to switch the user plane of the wireless backhaul from the second access network device to the third access network device;

After determining to switch the user plane of the wireless backhaul from the second access network device to the third access network device, send a user plane path switching request to the first access network device, and the user plane path switching The request includes the information of the third access network device, so that the first access network device sends a user plane path switching request to the third access network device according to the information of the third access network device, and A user plane path switching response sent by the third access network device is received.

With reference to the first possible implementation manner of the third aspect, in the second possible implementation manner of the third aspect, the transceiver is further configured to:

After receiving the handover response sent by the first access network device, send an indication message to the third access network device, where the indication message is used to indicate that the third access network device is a server of the serving gateway S-GW and a proxy node, so that the third access network device forwards user plane data between the first access network device and the second access network device.

With reference to the first possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect, the user plane path switching sent by the first access network device to the third access network device The request includes the IP address of the first access network device, so that the third access network device is the first access network device according to the IP address of the first access network device and the third access network device. The cell wireless network temporary identifier C-RNTI allocated by the access network device establishes a mapping relationship between the IP address of the first access network device and the C-RNTI of the first access network device, so that the third The access network device forwards the user plane data between the first access network device and the second access network device according to the mapping relationship.

With reference to the third aspect, in a fourth possible implementation manner of the third aspect, the second access network device is an access network device for instructing the first access network device to perform a control plane handover;

The handover request is a control plane path handover request;

The transceiver sends a handover request to the first access network device according to the measurement report, including:

Determine, according to the measurement report, to switch the control plane of the wireless backhaul from the second access network device to the third access network device;

After determining to switch the control plane of the wireless backhaul from the second access network device to the third access network device, send a control plane path switching request to the first access network device, and the control plane path switching The request includes the information of the third access network device, so that the first access network device sends a control plane path switching request to the third access network device according to the information of the third access network device and A user plane path switching response sent by the third access network device is received.

With reference to the fourth possible implementation manner of the third aspect, in a fifth possible implementation manner of the third aspect, the third access network device is further used as a proxy node of the mobility management entity MME; and,

The third access network device is further configured to determine the second access network device as a node for user plane separation, or, according to the measurement report of the first access network node, determine that a non-second access network device is User plane separation node.

In a fourth aspect, an access network device is provided, the access network device is a first access network device, and the device includes:

a processor, configured to establish a wireless backhaul control plane connection with the second access network device;

a transceiver, configured to send a measurement report to the second access network device, and receive a handover request sent by the second access network device, where the handover request is based on the measurement by the second access network device report sent;

The transceiver is further configured to separate the control plane and the user plane of the wireless backhaul according to the handover request, and send a handover response to the access network device after separation.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the second access network device is an access network device used to instruct the first access network device to perform user plane handover;

The handover request is a user plane path handover request, the user plane path handover request includes the information of the third access network device, and the user plane path handover request is the second access network device according to the The measurement report is sent after determining that the user plane of the wireless backhaul is switched from the second access network device to the third access network device;

The transceiver performs separation of the control plane and the user plane of the wireless backhaul according to the handover request, including:

The first access network device sends a user plane path switching request to the third access network device according to the information of the third access network device and receives the user plane path switching sent by the third access network device response.

With reference to the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the handover response further enables the second access network device to send the handover response to the second access network device after receiving the handover response. The third access network device sends an indication message, where the indication message is used to indicate that the third access network device is a proxy node of the serving gateway S-GW, so that the third access network device forwards the third access network device. User plane data between an access network device and the second access network device.

With reference to the first possible implementation manner of the fourth aspect, in a third possible implementation manner of the fourth aspect, the user plane path switching sent by the first access network device to the third access network device The request includes the IP address of the first access network device, so that the third access network device is the first access network device according to the IP address of the first access network device and the third access network device. The cell wireless network temporary identifier C-RNTI allocated by the access network device establishes a mapping relationship between the IP address of the first access network device and the C-RNTI of the first access network device, so that the third The access network device forwards the user plane data between the first access network device and the second access network device according to the mapping relationship.

With reference to the fourth aspect, in a fourth possible implementation manner of the fourth aspect, the second access network device is an access network device for instructing the first access network device to perform a control plane handover;

The handover request is a control plane path handover request, the control plane path handover request includes information of a third access network device, and the control plane handover request is determined by the second access network device according to the measurement report Sent after the control plane of the wireless backhaul is switched from the second access network device to the third access network device;

The transceiver performs separation of the control plane and the user plane of the wireless backhaul according to the handover request, including:

The first access network device sends a control plane path switch request to the third access network device according to the information of the third access network device and receives a user plane path switch sent by the third access network device response.

With reference to the fourth possible implementation manner of the fourth aspect, in a fifth possible implementation manner of the fourth aspect, the third access network device is further used as a proxy node of the mobility management entity MME; and,

The third access network device is further configured to determine the second access network device as a node for user plane separation, or, according to the measurement report of the first access network node, determine that a non-second access network device is User plane separation node.

Through the above technical solutions, the second access network device can instruct the first access network device to separate the control plane and the user plane of the wireless backhaul according to the measurement report sent by the first access network device, so that the control plane of the wireless backhaul can be realized The separation from the user plane avoids the problem caused by the non-separation of the control plane and the user plane of the wireless backhaul in the prior art, thereby reducing the transmission delay of the wireless backhaul control plane and improving the transmission efficiency of the wireless backhaul user plane.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative labor.

FIG. 1 is a schematic flowchart of a method for establishing a wireless backhaul link according to an embodiment of the present invention;

FIG. 2 is a schematic flowchart of another method for establishing a wireless backhaul link according to an embodiment of the present invention;

3 is a schematic flowchart of another method for establishing a wireless backhaul link according to an embodiment of the present invention;

4 is a schematic flowchart of another method for establishing a wireless backhaul link according to an embodiment of the present invention;

FIG. 5 is a schematic flowchart of another method for establishing a wireless backhaul link according to an embodiment of the present invention;

6 is a schematic structural diagram of an access network device according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of another access network device according to an embodiment of the present invention.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

1 is a schematic flowchart of a method for establishing a wireless backhaul link according to an embodiment of the present invention, including:

11: The second access network device establishes a wireless backhaul control plane connection with the first access network device;

The access network device in the embodiment of the present invention may specifically be an evolved NodeB (evolved NodeB, eNB), an RN, a DeNB, a micro base station (Micro), a pico base station (Pico), or a femto base station (Femto).

The first access network device refers to an endpoint connected to the core network through a wireless backhaul link, and the second access network device refers to a site that is not an endpoint of the wireless backhaul link in the access network. For example, when the RN communicates with the core network through the DeNB, and there is single-hop transmission between the RN and the DeNB, the first access network device refers to the RN, and the second access network device refers to the DeNB; or, when the RN communicates with the core network through the DeNB When the path between the RN and the DeNB is multi-hop, such as when the first RN communicates with the DeNB through the second RN, the second access network device may refer to the DeNB or may also be the second RN.

12: The second access network device receives the measurement report sent by the first access network device, and sends a handover request to the first access network device according to the measurement report, where the handover request is used to indicate The first access network device separates the control plane and the user plane of the wireless backhaul;

Optionally, the separation of the control plane and the user plane of the wireless backhaul may include: switching the user plane to another access network device; or, switching the control plane to another access network device. which is,

Corresponding to user plane handover, the second access network device is an access network device used to instruct the first access network device to perform user plane handover; for example, in the above multi-hop scenario, the first access network device The device refers to the first RN, and the second access network setting refers to the DeNB; the first RN establishes a control plane connection with the DeNB, and then the DeNB can instruct the first RN to switch the user plane to the second RN.

At this time, the switching request is a user plane path switching request. It can be understood that the name of the user plane path switching request may also be other names, which are used to indicate that the first access network device is used for user plane switching. Moreover, in a specific embodiment, the user plane path switching request may be a newly added message, or may also be a newly added information element in an existing message, so as to complete the instruction to the first access network device.

At this time, the sending a handover request to the first access network device according to the measurement report includes:

Determine according to the measurement report to switch the user plane of the wireless backhaul from the second access network device to the third access network device;

After determining to switch the user plane of the wireless backhaul from the second access network device to the third access network device, send a user plane path switching request to the first access network device, and the user plane path switching The request includes the information of the third access network device, so that the first access network device sends a user plane path switching request to the third access network device according to the information of the third access network device, and A user plane path switching response sent by the third access network device is received.

The above-mentioned user plane handover can make the user plane of the wireless backhaul after the handover be multi-hop transmission in the access network. For example, in the above-mentioned multi-hop scenario, the DeNB may instruct the first RN to switch the user plane from the DeNB to the first RN. Second RN on. or,

Corresponding to control plane handover, the second access network device is an access network device used to instruct the first access network device to perform control plane handover; for example, in the above multi-hop scenario, the first access network device The device refers to the first RN, and the second access network setting refers to the second RN; the first RN establishes a control plane connection with the second RN, and then the second RN can instruct the first RN to switch the control plane to the DeNB.

In this case, the handover request is a control plane path handover request. It can be understood that the name of the control plane path switching request may also be other names, which are used to indicate that the first access network device is used for control plane switching. Moreover, in a specific embodiment, the control plane path switching request may be a newly added message, or may also be a newly added information element in an existing message, so as to complete the instruction to the first access network device.

At this time, the sending a handover request to the first access network device according to the measurement report includes:

Determine, according to the measurement report, to switch the control plane of the wireless backhaul from the second access network device to the third access network device;

After determining to switch the control plane of the wireless backhaul from the second access network device to the third access network device, send a control plane path switching request to the first access network device, and the control plane path switching The request includes the information of the third access network device, so that the first access network device sends a control plane path switching request to the third access network device according to the information of the third access network device and A user plane path switching response sent by the third access network device is received.

The above control plane handover can make the transmission delay of the wireless backhaul control plane after handover in the access network smaller than the transmission delay of the wireless backhaul control plane before handover in the access network, for example, in the above multi-hop scenario Next, the second RN may instruct the first RN to switch the control plane from the second RN to the DeNB, so that the control plane after the handover is single-hop and the transmission delay is reduced. It can be understood that the above-mentioned reduction of the transmission delay is not limited to making the control plane path after the handover a single hop, as long as the transmission delay of the control plane path after the handover is less than the transmission delay before the handover, for example, also It may be that the number of transmission hops of the control plane path after the handover is less than the number of transmission hops before the handover. For example, before the handover, the first RN reaches the DeNB through three hops, then the first RN can be made to reach the DeNB through two hops after the handover; It can be that the number of transmission hops of the control plane path after the handover is the same as the number of transmission hops before the handover, but the transmission delay of the control plane path after the handover is smaller than the transmission delay of the control plane path before the handover. The RN transmits the control plane through the second RN and the DeNB. It is assumed that the transmission delay when the first RN transmits the control plane through the third RN and the DeNB is smaller than the transmission delay when the first RN transmits the control plane through the second RN and the DeNB. , then the control plane path can be switched so that the first RN communicates with the DeNB through the third RN.

13: The second access network device receives a handover response sent by the first access network device, where the handover response is sent after the first access network device separates the control plane and the user plane of the wireless backhaul of.

For user plane handover, after the user plane handover, the second access network device may instruct the third access network device as the proxy node of the S-GW, or the second access network device may also determine itself as the S-GW's proxy node. agent node. which is,

Optionally, after receiving the handover response sent by the first access network device, the method further includes:

The second access network device sends an indication message to the third access network device, where the indication message is used to indicate that the third access network device is a proxy node of the S-GW, so that the third access network device is a proxy node of the S-GW. The network access device forwards user plane data between the first access network device and the second access network device.

or,

Optionally, the user plane path switching request sent by the first access network device to the third access network device includes the IP address of the first access network device, so that the third access network device can The device establishes a Cell Radio Network Temporary Identity (C-RNTI) according to the IP address of the first access network device and the Cell Radio Network Temporary Identity (C-RNTI) allocated by the third access network device to the first access network device The mapping relationship between the IP address of the first access network device and the C-RNTI of the first access network device, so that the third access network device forwards the first access network device according to the mapping relationship. User plane data between the network access device and the second access network device.

For the control plane handover, after the control plane handover, the third access network device acts as the proxy node of the MME, and at this time, the third access network device may determine the second access network device as the node separated from the user plane, or, The third access network device may also determine, according to the measurement report reported by the first access network device, other access network devices as the nodes of the user plane separation. which is,

The third access network device is also used as a proxy node of the MME; and,

The third access network device is further configured to determine the second access network device as a node for user plane separation, or, according to the measurement report of the first access network node, determine that a non-second access network device is User plane separation node.

Correspondingly, the process performed by the first access network device may refer to FIG. 2, including:

21: The first access network device establishes a wireless backhaul control plane connection with the second access network device;

22: The first access network device sends a measurement report to the second access network device, and receives a handover request sent by the second access network device, where the handover request is the second access network device sent by the device according to the measurement report;

23: The first access network device separates the control plane and the user plane of the wireless backhaul according to the handover request, and sends a handover response to the access network device after separation.

Optionally, the second access network device is an access network device used to instruct the first access network device to perform user plane handover;

The handover request is a user plane path handover request, the user plane path handover request includes the information of the third access network device, and the user plane path handover request is the second access network device according to the The measurement report is sent after determining that the user plane of the wireless backhaul is switched from the second access network device to the third access network device;

The first access network device performs separation of the control plane and the user plane of the wireless backhaul according to the handover request, including:

The first access network device sends a user plane path switching request to the third access network device according to the information of the third access network device and receives the user plane path switching sent by the third access network device response.

Optionally, the handover response further enables the second access network device to send an indication message to the third access network device after receiving the handover response, where the indication message is used to indicate the third access network device The access network device is a proxy node of the S-GW, so that the third access network device forwards user plane data between the first access network device and the second access network device.

Optionally, the user plane path switching request sent by the first access network device to the third access network device includes the IP address of the first access network device, so that the third access network device can According to the IP address of the first access network device and the C-RNTI allocated by the third access network device to the first access network device, the device establishes the relationship between the IP address of the first access network device and all The mapping relationship between the C-RNTIs of the first access network device, so that the third access network device forwards the relationship between the first access network device and the second access network device according to the mapping relationship. user plane data between.

or,

Optionally, the second access network device is an access network device used to instruct the first access network device to perform control plane handover;

The handover request is a control plane path handover request, the control plane path handover request includes information of a third access network device, and the control plane handover request is determined by the second access network device according to the measurement report Sent after the control plane of the wireless backhaul is switched from the second access network device to the third access network device;

The separation of the control plane and the user plane of the wireless backhaul by the first access network device according to the handover request includes: the first access network device reports to the third access network device according to the information of the third access network device. The third access network device sends a control plane path switching request and receives a user plane path switching response sent by the third access network device.

Optionally, the third access network device is also used as a proxy node of the MME; and,

The third access network device is further configured to determine the second access network device as a node for user plane separation, or, according to the measurement report of the first access network node, determine that a non-second access network device is User plane separation node.

In this embodiment, the second access network device may instruct the first access network device to separate the control plane and the user plane of the wireless backhaul according to the measurement report sent by the first access network device, so as to realize the control plane of the wireless backhaul The separation from the user plane avoids the problem caused by the non-separation of the control plane and the user plane of the wireless backhaul in the prior art, thereby reducing the transmission delay of the wireless backhaul control plane and improving the transmission efficiency of the wireless backhaul user plane.

The embodiments of the present invention can be applied to a multi-hop access network device scenario, that is, the access network includes at least three access network devices. Specifically, in this embodiment of the present invention, the access network device may include a first RN, a second RN, and a DeNB, and the DeNB is connected to the core network.

In the prior art, both the control plane and the user plane of the wireless backhaul may be single-hop in the access network, that is, the first RN directly establishes the connection between the control plane and the user plane with the DeNB. The problem of poor data transmission efficiency on the user plane caused by the link quality problem between the two RNs; or, the control plane and the user plane of the wireless backhaul may both be multi-hop in the access network, that is, the first RN establishes and the second RN The second RN establishes a connection with the DeNB. The transmission of the control plane and the transmission of the user plane between the first RN and the DeNB need to be forwarded by the second RN. At this time, since the second RN is required to forward, the It will increase the transmission delay of the control plane and reduce the system performance.

To this end, the embodiment of the present invention proposes to separate the user plane and the control plane of the wireless backhaul, the user plane adopts multi-hop transmission, which can improve the data transmission efficiency, and the control plane adopts the path transmission with low delay to reduce the transmission delay.

In a specific embodiment, the first RN may first establish a single-hop connection with the DeNB, and then switch the user plane to the second RN, so that the user plane transmission is switched from single-hop to multi-hop. Alternatively, the first RN may first establish a connection with the second RN, and then switch the control plane to the DeNB, so that the control plane transmission is switched from multi-hop to single-hop. For details, refer to subsequent embodiments.

It can be understood that the following embodiments take two hops between access network devices as an example, and the access network includes the first RN, the second RN, and the DeNB as an example, but the present invention is not limited to the above multi-hop scenario, for example , there can be at least three hops between access network devices. In this case, as long as the delay of the control plane path after the handover is less than the transmission delay of the control plane before the handover, it is not limited to a single hop. For details, please refer to the above related descriptions ; In addition, the access network equipment is not limited to the above-mentioned RN and DeNB, for other equipment, such as eNB, pico, etc. can also refer to the implementation.

3 is a schematic flowchart of another method for establishing a wireless backhaul link according to an embodiment of the present invention. In this embodiment, a single-hop connection is first established, and then the user plane is switched to multi-hop, and the second RN is designated as S- GW's proxy node. This embodiment includes:

301: The first RN selects a DeNB according to the received DeNB list and establishes an RRC connection with the selected DeNB.

302: The DeNB configures the RRC connection of the first RN, including the measurement configuration. The first RN completes the relay attach process and completes the configuration of the first RN.

303: The first RN establishes a control plane connection with the DeNB, that is, an S1-MME connection.

304: The first RN sends a measurement report to the DeNB.

305: The DeNB judges whether to switch the connection of the user plane according to the measurement report, that is, whether to switch the user plane to the second RN, if so, go to 306, otherwise, keep the user plane on the DeNB and then use a single hop to transmit the user plane data.

For example, the measurement report can carry the channel quality of other RNs that can be detected by the first RN. If the channel quality of a certain RN is better than the channel quality of the DeNB or the channel quality of a certain RN is better than a certain threshold, it can be determined that The user plane is switched to the RN, and the other RN whose channel quality is better than the DeNB can be called the second RN. It can be understood that the node detected by the first RN is not limited to the RN, and may also be an eNB, a micro, a pico, or the like.

306: The DeNB sends a user plane path switch request (S1-U Path Switch request) to the first RN, where the user plane path switch request includes information of the second RN.

The information of the second RN may specifically be a cell ID (cell ID) of the second RN and/or the IP address of the second RN.

It can be understood that the user plane path switching request may have other names, and may specifically be a newly added message or corresponding indication information may be added through an existing message.

307: The first RN establishes an RRC connection with the second RN according to the information of the second RN.

308: The first RN sends a user plane path switching request to the second RN, and receives a user plane path switching response sent by the second RN.

The user plane path switching request sent by the first RN to the second RN may carry information such as the cell ID and/or IP address of the DeNB.

After receiving the user plane path switching response sent by the second RN, the first RN may identify that the S1-U transmission path is switched to the second RN.

309: The first RN sends a user plane path switching response to the DeNB to indicate that the first RN and the second RN successfully establish the S1-U transmission channel.

310: The DeNB indicates that the second RN is a proxy node of the core network.

The DeNB may establish a GTP-C Create session with the second RN to instruct the second RN to act as a proxy node of the MME or S-GW during the process of connecting the UE to the first RN and attaching (Attach).

After that, the transmission path of the user plane can be:

UE←→first RN←→second RN←→DeNB←→core network.

In this embodiment, after a single-hop connection is established between the first RN and the DeNB, the first RN switches the user plane to the second RN, so that the control plane and the user plane can be separated. The control plane adopts a single-hop connection, and the user plane adopts a multiple The hop connection can reduce the delay of control plane transmission and improve the data transmission efficiency of the user plane.

FIG. 4 is a schematic flowchart of another method for establishing a wireless backhaul link according to an embodiment of the present invention. In this embodiment, a single-hop connection is first established and then the user plane is switched to multi-hop, and the DeNB is the proxy of the S-GW node. This embodiment includes:

401: The first RN selects a DeNB according to the received DeNB list and establishes an RRC connection with the selected DeNB.

402: The DeNB configures the RRC connection of the first RN, including the measurement configuration. The first RN completes the relay attach process and completes the configuration of the first RN.

403: The first RN establishes a control plane connection with the DeNB, that is, an S1-MME connection.

404: The first RN sends a measurement report to the DeNB.

405: The DeNB determines whether to switch the connection of the user plane according to the measurement report, that is, whether the user plane needs to be switched to the second RN, and if so, execute 406;

For example, the measurement report can carry the channel quality of other RNs that can be detected by the first RN. If the channel quality of a certain RN is better than the channel quality of the DeNB or the channel quality of a certain RN is better than a certain threshold, it can be determined that The user plane is switched to the RN, and the other RN whose channel quality is better than the DeNB can be called the second RN. It can be understood that the node detected by the first RN is not limited to the RN, and may also be an eNB, a micro, a pico, or the like.

406: The DeNB sends a user plane path switch request (S1-U Path Switch request) to the first RN, where the user plane path switch request includes information of the second RN.

The information of the second RN may specifically be a cell ID (cell ID) of the second RN and/or the IP address of the second RN.

It can be understood that the user plane path switching request may have other names, and may specifically be a newly added message or corresponding indication information may be added through an existing message.

407: The first RN establishes an RRC connection with the second RN according to the information of the second RN.

408: The first RN sends a user plane path switching request to the second RN, and receives a user plane path switching response sent by the second RN.

The user plane path switching request sent by the first RN to the second RN may carry information such as the cell ID and/or IP address of the DeNB. In addition, different from the previous embodiment, the user plane handover request also carries the IP address of the first RN.

After receiving the user plane path switching response sent by the second RN, the first RN may identify that the S1-U transmission path is switched to the second RN.

409: The first RN sends a user plane path switching response to the DeNB to indicate that the first RN and the second RN successfully establish the S1-U transmission channel.

410: The second RN establishes a mapping relationship between the IP address of the first RN and the C-RNTI of the first RN according to the IP address of the first RN and the C-RNTI allocated by the second RN to the first RN, and then, in During user plane transmission, the second RN forwards the user plane data between the first RN and the DeNB according to the mapping relationship.

Different from the previous embodiment, this embodiment uses the DeNB as the proxy node, the transmission between the first RN and the second RN needs to be based on the C-RNTI of the first RN, and the transmission between the second RN and the DeNB needs to be based on the C-RNTI of the first RN. According to the IP address of the first RN, therefore, the above-mentioned mapping relationship needs to be stored in the second RN to complete data forwarding.

In this embodiment, in the process of connecting the UE to the first RN and attaching (Attach), the DeNB does not need to establish a GTP-C Create session with the second RN.

After that, the transmission path of the user plane can be:

UE←→first RN←→second RN←→DeNB←→core network.

In this embodiment, after a single-hop connection is established between the first RN and the DeNB, the first RN switches the user plane to the second RN, so that the control plane and the user plane can be separated. The control plane adopts a single-hop connection, and the user plane adopts a multiple The hop connection can reduce the delay of control plane transmission and improve the data transmission efficiency of the user plane.

FIG. 5 is a schematic flowchart of another method for establishing a wireless backhaul link according to an embodiment of the present invention. In this embodiment, a multi-hop connection is established first, and then the control plane is switched to a single-hop. This embodiment includes:

501: The first RN selects the second RN according to the received DeNB list, the DeNB list includes the second RN, and establishes an RRC connection with the second RN.

It can be understood that the node detected by the first RN is not limited to the RN, and may also be an eNB, a micro, a pico, or the like.

502: The second RN configures the RRC connection of the first RN, including the measurement configuration. The first RN completes the relay attach process and completes the configuration of the first RN.

503: The first RN establishes a control plane connection with the second RN, that is, an S1-MME connection.

504: The first RN sends a measurement report to the second RN.

505: The second RN determines whether to switch the connection of the control plane according to the measurement report, that is, whether it is necessary to switch the control plane to the DeNB, if so, go to 506, otherwise, keep the control plane on the second RN and then adopt multi-hop transmission control plane data.

For example, the measurement report may carry the channel quality of the DeNB that can be detected by the first RN. If it is found that the DeNB is connected to the core network through a wired connection, it can be determined to switch the control plane to the DeNB.

It can be understood that the node detected by the first RN is not limited to the DeNB, and may also be an RN, an eNB, a micro, a pico, or the like.

506: The second RN sends a control plane path switch request (S1-MME Path Switch request) to the first RN, where the control plane path switch request includes the information of the DeNB.

The information of the DeNB may specifically be the cell ID (cell ID) of the DeNB and/or the IP address of the DeNB.

It can be understood that the control plane path switching request may have other names, and may specifically be a newly added message or corresponding indication information may be added through an existing message.

507: The first RN establishes an RRC connection with the DeNB according to the information of the DeNB.

508: The first RN sends a control plane path switching request to the DeNB, and receives a control plane path switching response sent by the DeNB.

The control plane path switching request sent by the first RN to the DeNB may carry information such as the cell ID and/or IP address of the second RN.

509: The first RN sends a control plane path switching response to the second RN.

The first RN may disconnect the control plane (S1-MME) connection with the second RN after sending the control plane path switching response to the second RN.

510: The first RN establishes a control plane connection with the DeNB, that is, an S1-MME connection.

511: According to the process of implementing the separation of the S1 control plane and the user plane by the DeNB acting as the MME proxy, the DeNB may directly use the second RN as the site for separating the user plane, or select the site for separating the user plane according to the measurement result of the RN.

After the DeNB acts as the proxy node of the MME, the control plane data will be directly transmitted between the first RN and the DeNB to realize single-hop transmission of the control plane.

In addition, when the user plane is switched, the control plane path switching request reported by the first RN to the DeNB includes the information of the second RN, and the first RN may also report a measurement report to the DeNB, and the measurement report includes the channel detected by the first RN. For the information of the RN with better quality, such as the information of the third RN, the DeNB may select the second RN or the third RN as the user plane separation site according to the rules set by itself.

When the second RN is selected as the user plane separation site, the second RN forwards the user plane data between the first RN and the DeNB; or, when the third RN is selected as the user plane separation site, the third RN forwards the first RN and the DeNB user plane data between.

In this embodiment, after the first RN establishes a connection with the second RN, the first RN switches the control plane to the DeNB, so that the control plane and the user plane can be separated, the control plane adopts a single-hop connection, and the user plane adopts a multi-hop connection , which can reduce the delay of control plane transmission and improve the data transmission efficiency of user plane.

FIG. 6 is a schematic structural diagram of an access network device according to an embodiment of the present invention. The device may be a second access network device. The device 60 includes a processor 61 and a transceiver 62; the processor 61 is used to communicate with the first access network device. The access network device establishes a wireless backhaul control plane connection; the transceiver 62 is configured to receive a measurement report sent by the first access network device, and send a handover request to the first access network device according to the measurement report, The handover request is used to instruct the first access network device to perform the separation of the control plane and the user plane of the wireless backhaul; the transceiver 62 is further configured to receive a handover response sent by the first access network device. The handover response is sent after the first access network device separates the control plane and the user plane of the wireless backhaul.

Optionally, the second access network device is an access network device used to instruct the first access network device to perform user plane handover;

The switching request is a user plane path switching request;

The transceiver 62 sends a handover request to the first access network device according to the measurement report, including:

Determine according to the measurement report to switch the user plane of the wireless backhaul from the second access network device to the third access network device;

After determining to switch the user plane of the wireless backhaul from the second access network device to the third access network device, send a user plane path switching request to the first access network device, and the user plane path switching The request includes the information of the third access network device, so that the first access network device sends a user plane path switching request to the third access network device according to the information of the third access network device, and A user plane path switching response sent by the third access network device is received.

Optionally, the transceiver 62 is also used for:

After receiving the handover response sent by the first access network device, send an indication message to the third access network device, where the indication message is used to indicate that the third access network device is the proxy node of the S-GW , so that the third access network device forwards the user plane data between the first access network device and the second access network device.

Optionally, the user plane path switching request sent by the first access network device to the third access network device includes the IP address of the first access network device, so that the third access network device can According to the IP address of the first access network device and the C-RNTI allocated by the third access network device to the first access network device, the device establishes the relationship between the IP address of the first access network device and all The mapping relationship between the C-RNTIs of the first access network device, so that the third access network device forwards the relationship between the first access network device and the second access network device according to the mapping relationship. user plane data between.

Optionally, the second access network device is an access network device used to instruct the first access network device to perform control plane handover;

The handover request is a control plane path handover request;

The transceiver 62 sends a handover request to the first access network device according to the measurement report, including:

Determine, according to the measurement report, to switch the control plane of the wireless backhaul from the second access network device to the third access network device;

After determining to switch the control plane of the wireless backhaul from the second access network device to the third access network device, send a control plane path switching request to the first access network device, and the control plane path switching The request includes the information of the third access network device, so that the first access network device sends a control plane path switching request to the third access network device according to the information of the third access network device and A user plane path switching response sent by the third access network device is received.

Optionally, the third access network device is also used as a proxy node of the MME; and,

The third access network device is further configured to determine the second access network device as a node for user plane separation, or, according to the measurement report of the first access network node, determine that a non-second access network device is User plane separation node.

It can be understood that the access network device in this embodiment may further include general components such as a memory, an antenna, a baseband processing component, an intermediate radio frequency processing component, and an input and output device, which is not limited in this embodiment of the present invention.

In this embodiment, the second access network device may instruct the first access network device to separate the control plane and the user plane of the wireless backhaul according to the measurement report sent by the first access network device, so as to realize the control plane of the wireless backhaul The separation from the user plane avoids the problem caused by the non-separation of the control plane and the user plane of the wireless backhaul in the prior art, thereby reducing the transmission delay of the wireless backhaul control plane and improving the transmission efficiency of the wireless backhaul user plane.

FIG. 7 is a schematic structural diagram of another access network device provided by an embodiment of the present invention. The device may be a first access network device. The device 70 includes a processor 71 and a transceiver 72; the processor 71 is used to communicate with the first access network device. The two access network devices establish a wireless backhaul control plane connection; the transceiver 72 is configured to send a measurement report to the second access network device, and receive a handover request sent by the second access network device, the handover request It is sent by the second access network device according to the measurement report; the transceiver 72 is further configured to separate the control plane and the user plane of the wireless backhaul according to the handover request, and send the data to the access network after separation. The networked device sends a handover response.

Optionally, the second access network device is an access network device used to instruct the first access network device to perform user plane handover;

The handover request is a user plane path handover request, the user plane path handover request includes the information of the third access network device, and the user plane path handover request is the second access network device according to the The measurement report is sent after determining that the user plane of the wireless backhaul is switched from the second access network device to the third access network device;

The transceiver 72 separates the control plane and the user plane of the wireless backhaul according to the handover request, including:

The first access network device sends a user plane path switching request to the third access network device according to the information of the third access network device and receives the user plane path switching sent by the third access network device response.

Optionally, the handover response further enables the second access network device to send an indication message to the third access network device after receiving the handover response, where the indication message is used to indicate the third access network device The access network device is a proxy node of the S-GW, so that the third access network device forwards user plane data between the first access network device and the second access network device.

Optionally, the user plane path switching request sent by the first access network device to the third access network device includes the IP address of the first access network device, so that the third access network device can According to the IP address of the first access network device and the C-RNTI allocated by the third access network device to the first access network device, the device establishes the relationship between the IP address of the first access network device and all The mapping relationship between the C-RNTIs of the first access network device, so that the third access network device forwards the relationship between the first access network device and the second access network device according to the mapping relationship. user plane data between.

Optionally, the second access network device is an access network device used to instruct the first access network device to perform control plane handover;

The handover request is a control plane path handover request, the control plane path handover request includes information of a third access network device, and the control plane handover request is determined by the second access network device according to the measurement report Sent after the control plane of the wireless backhaul is switched from the second access network device to the third access network device;

The transceiver performs separation of the control plane and the user plane of the wireless backhaul according to the handover request, including:

The first access network device sends a control plane path switch request to the third access network device according to the information of the third access network device and receives a user plane path switch sent by the third access network device response.

Optionally, the third access network device is also used as a proxy node of the MME; and,

The third access network device is further configured to determine the second access network device as a node for user plane separation, or, according to the measurement report of the first access network node, determine that a non-second access network device is User plane separation node.

It can be understood that the access network device in this embodiment may further include general components such as a memory, an antenna, a baseband processing component, an intermediate radio frequency processing component, and an input and output device, which is not limited in this embodiment of the present invention.

In this embodiment, the second access network device may instruct the first access network device to separate the control plane and the user plane of the wireless backhaul according to the measurement report sent by the first access network device, so as to realize the control plane of the wireless backhaul The separation from the user plane avoids the problem caused by the non-separation of the control plane and the user plane of the wireless backhaul in the prior art, thereby reducing the transmission delay of the wireless backhaul control plane and improving the transmission efficiency of the wireless backhaul user plane.

Those skilled in the art can clearly understand that, for the convenience and conciseness of the description, only the division of the above-mentioned functional modules is used for illustration. In practical applications, the above-mentioned functions can be allocated to different functional modules as required. The internal structure of the device is divided into different functional modules to complete all or part of the functions described above. For the specific working process of the system, apparatus and unit described above, reference may be made to the corresponding process in the foregoing method embodiments, and details are not described herein again.

In the several embodiments provided in this application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the device embodiments described above are only illustrative. For example, the division of the modules or units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be Incorporation may either be integrated into another system, or some features may be omitted, or not implemented. On the other hand, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in electrical, mechanical or other forms.

The units described as separate components may or may not be physically separated, and components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution in this embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

The integrated unit, if implemented in the form of a software functional unit and sold or used as an independent product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the present application can be embodied in the form of software products in essence, or the parts that contribute to the prior art, or all or part of the technical solutions, and the computer software products are stored in a storage medium , including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes .

As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand: The technical solutions described in the embodiments are modified, or some technical features thereof are equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions in the embodiments of the present application.

Claims (24)

1. A method for establishing a wireless backhaul link, comprising: The second access network device establishes a wireless backhaul control plane connection with the first access network device; The second access network device receives a measurement report sent by the first access network device, and sends a handover request to the first access network device according to the measurement report, where the handover request is used to indicate the The first access network device separates the control plane and the user plane of the wireless backhaul; The second access network device receives a handover response sent by the first access network device, where the handover response is sent after the first access network device separates the control plane and the user plane of the wireless backhaul. 2. The method according to claim 1, wherein The second access network device is an access network device used to instruct the first access network device to perform user plane handover; The switching request is a user plane path switching request; The sending a handover request to the first access network device according to the measurement report includes: Determine according to the measurement report to switch the user plane of the wireless backhaul from the second access network device to the third access network device; After determining to switch the user plane of the wireless backhaul from the second access network device to the third access network device, send a user plane path switching request to the first access network device, and the user plane path switching The request includes the information of the third access network device, so that the first access network device sends a user plane path switching request to the third access network device according to the information of the third access network device, and A user plane path switching response sent by the third access network device is received. 3. The method according to claim 2, wherein after receiving the handover response sent by the first access network device, the method further comprises: The second access network device sends an indication message to the third access network device, where the indication message is used to indicate that the third access network device is the proxy node of the serving gateway S-GW, so that the third access network device is The third access network device forwards the user plane data between the first access network device and the second access network device. 4. The method according to claim 2, wherein The user plane path switching request sent by the first access network device to the third access network device includes the IP address of the first access network device, so that the third access network device can The IP address of the first access network device and the cell radio network temporary identifier C-RNTI allocated by the third access network device to the first access network device establish the relationship between the IP address of the first access network device and the C-RNTI. The mapping relationship between the C-RNTIs of the first access network device, so that the third access network device forwards the first access network device and the second access network device according to the mapping relationship between user plane data. 5. The method of claim 1, wherein The second access network device is an access network device used to instruct the first access network device to perform control plane handover; The handover request is a control plane path handover request; The sending a handover request to the first access network device according to the measurement report includes: Determine, according to the measurement report, to switch the control plane of the wireless backhaul from the second access network device to the third access network device; After determining to switch the control plane of the wireless backhaul from the second access network device to the third access network device, send a control plane path switching request to the first access network device, and the control plane path switching The request includes the information of the third access network device, so that the first access network device sends a control plane path switching request to the third access network device according to the information of the third access network device and A user plane path switching response sent by the third access network device is received. 6. The method of claim 5, wherein The third access network device is also used as a proxy node of the mobility management entity MME; and, The third access network device is further configured to determine the second access network device as a node for user plane separation, or, according to the measurement report of the first access network node, determine that a non-second access network device is User plane separation node. 7. A method for establishing a wireless backhaul link, comprising: establishing a wireless backhaul control plane connection between the first access network device and the second access network device; The first access network device sends a measurement report to the second access network device, and receives a handover request sent by the second access network device, where the handover request is based on the second access network device. sent by the measurement report; The first access network device separates the control plane and the user plane of the wireless backhaul according to the handover request, and sends a handover response to the access network device after separation. 8. The method of claim 7, wherein The second access network device is an access network device used to instruct the first access network device to perform user plane handover; The handover request is a user plane path handover request, the user plane path handover request includes information of a third access network device, and the user plane path handover request is the second access network device according to the measurement report. Sent after determining that the user plane of the wireless backhaul is switched from the second access network device to the third access network device; The first access network device performs separation of the control plane and the user plane of the wireless backhaul according to the handover request, including: The first access network device sends a user plane path switching request to the third access network device according to the information of the third access network device and receives the user plane path switching sent by the third access network device response. The method according to claim 8, wherein the handover response further enables the second access network device to send an indication message to the third access network device after receiving the handover response, The indication message is used to indicate that the third access network device is a proxy node of the serving gateway S-GW, so that the third access network device forwards the first access network device and the second access network User plane data between network devices. 10. The method of claim 8, wherein: The user plane path switching request sent by the first access network device to the third access network device includes the IP address of the first access network device, so that the third access network device can The IP address of the first access network device and the cell radio network temporary identifier C-RNTI allocated by the third access network device to the first access network device establish the relationship between the IP address of the first access network device and the C-RNTI. The mapping relationship between the C-RNTIs of the first access network device, so that the third access network device forwards the first access network device and the second access network device according to the mapping relationship between user plane data. 11. The method of claim 7, wherein: The second access network device is an access network device used to instruct the first access network device to perform control plane handover; The handover request is a control plane path handover request, the control plane path handover request includes information of a third access network device, and the control plane handover request is determined by the second access network device according to the measurement report Sent after the control plane of the wireless backhaul is switched from the second access network device to the third access network device; The first access network device performs separation of the control plane and the user plane of the wireless backhaul according to the handover request, including: The first access network device sends a control plane path switch request to the third access network device according to the information of the third access network device and receives a user plane path switch sent by the third access network device response. 12. The method of claim 11, wherein: The third access network device is also used as a proxy node of the mobility management entity MME; and, The third access network device is further configured to determine the second access network device as a node for user plane separation, or, according to the measurement report of the first access network node, determine that a non-second access network device is User plane separation node. 13. An access network device, the access network device being a second access network device, wherein the device comprises: a processor, configured to establish a wireless backhaul control plane connection with the first access network device; a transceiver, configured to receive a measurement report sent by the first access network device, and send a handover request to the first access network device according to the measurement report, where the handover request is used to instruct the first access network device The network access device separates the control plane and the user plane of the wireless backhaul; The transceiver is further configured to receive a handover response sent by the first access network device, where the handover response is sent after the first access network device separates the control plane and the user plane of the wireless backhaul. 14. The apparatus of claim 13, wherein The second access network device is an access network device used to instruct the first access network device to perform user plane handover; The switching request is a user plane path switching request; The transceiver sends a handover request to the first access network device according to the measurement report, including: Determine according to the measurement report to switch the user plane of the wireless backhaul from the second access network device to the third access network device; After determining to switch the user plane of the wireless backhaul from the second access network device to the third access network device, send a user plane path switching request to the first access network device, and the user plane path switching The request includes the information of the third access network device, so that the first access network device sends a user plane path switching request to the third access network device according to the information of the third access network device, and A user plane path switching response sent by the third access network device is received. 15. The device of claim 14, wherein the transceiver is further configured to: After receiving the handover response sent by the first access network device, send an indication message to the third access network device, where the indication message is used to indicate that the third access network device is a server of the serving gateway S-GW and a proxy node, so that the third access network device forwards user plane data between the first access network device and the second access network device. 16. The apparatus of claim 14, wherein The user plane path switching request sent by the first access network device to the third access network device includes the IP address of the first access network device, so that the third access network device can The IP address of the first access network device and the cell radio network temporary identifier C-RNTI allocated by the third access network device to the first access network device establish the relationship between the IP address of the first access network device and the C-RNTI. The mapping relationship between the C-RNTIs of the first access network device, so that the third access network device forwards the first access network device and the second access network device according to the mapping relationship between user plane data. 17. The apparatus of claim 13, wherein The second access network device is an access network device used to instruct the first access network device to perform control plane handover; The handover request is a control plane path handover request; The transceiver sends a handover request to the first access network device according to the measurement report, including: Determine, according to the measurement report, to switch the control plane of the wireless backhaul from the second access network device to the third access network device; After determining to switch the control plane of the wireless backhaul from the second access network device to the third access network device, send a control plane path switching request to the first access network device, and the control plane path switching The request includes the information of the third access network device, so that the first access network device sends a control plane path switching request to the third access network device according to the information of the third access network device and A user plane path switching response sent by the third access network device is received. 18. The apparatus of claim 17, wherein The third access network device is also used as a proxy node of the mobility management entity MME; and, The third access network device is further configured to determine the second access network device as a node for user plane separation, or, according to the measurement report of the first access network node, determine that a non-second access network device is User plane separation node. 19. An access network device, the access network device being a first access network device, wherein the device comprises: a processor, configured to establish a wireless backhaul control plane connection with the second access network device; a transceiver, configured to send a measurement report to the second access network device, and receive a handover request sent by the second access network device, where the handover request is based on the measurement by the second access network device report sent; The transceiver is further configured to separate the control plane and the user plane of the wireless backhaul according to the handover request, and send a handover response to the access network device after separation. 20. The apparatus of claim 19, wherein The second access network device is an access network device used to instruct the first access network device to perform user plane handover; The handover request is a user plane path handover request, the user plane path handover request includes information of a third access network device, and the user plane path handover request is the second access network device according to the measurement report. Sent after determining that the user plane of the wireless backhaul is switched from the second access network device to the third access network device; The transceiver performs separation of the control plane and the user plane of the wireless backhaul according to the handover request, including: The first access network device sends a user plane path switching request to the third access network device according to the information of the third access network device and receives the user plane path switching sent by the third access network device response. 21. The device according to claim 20, wherein the handover response further enables the second access network device to send an instruction message to the third access network device after receiving the handover response, The indication message is used to indicate that the third access network device is a proxy node of the serving gateway S-GW, so that the third access network device forwards the first access network device and the second access network User plane data between network devices. 22. The apparatus of claim 20, wherein The user plane path switching request sent by the first access network device to the third access network device includes the IP address of the first access network device, so that the third access network device can The IP address of the first access network device and the cell radio network temporary identifier C-RNTI allocated by the third access network device to the first access network device establish the relationship between the IP address of the first access network device and the C-RNTI. The mapping relationship between the C-RNTIs of the first access network device, so that the third access network device forwards the first access network device and the second access network device according to the mapping relationship between user plane data. 23. The apparatus of claim 19, wherein The second access network device is an access network device used to instruct the first access network device to perform control plane handover; The handover request is a control plane path handover request, the control plane path handover request includes information of a third access network device, and the control plane handover request is determined by the second access network device according to the measurement report Sent after the control plane of the wireless backhaul is switched from the second access network device to the third access network device; The transceiver performs separation of the control plane and the user plane of the wireless backhaul according to the handover request, including: The first access network device sends a control plane path switch request to the third access network device according to the information of the third access network device and receives a user plane path switch sent by the third access network device response. 24. The apparatus of claim 23, wherein The third access network device is also used as a proxy node of the mobility management entity MME; and, The third access network device is further configured to determine the second access network device as a node for user plane separation, or, according to the measurement report of the first access network node, determine that a non-second access network device is User plane separation node.