# US 2019/0174370 A1 · Synchronization Method, Communication Handover Method, Radio Network and Node

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- Number: US 2019/0174370 A1
- Document ID: US20190174370A1
- Status: Published application
- Kind: A1
- Application number: 16/271,389
- Filed: 2019-02-08
- Published: 2019-06-06
- Earliest claimed: 2007-04-30
- Assignees: Huawei Technologies Co., Ltd.
- Applicants: Huawei Technologies Co.,Ltd.
- Inventors: Yong Qiu
- Web page: https://patentgrep.com/patent/US20190174370A1

## CPC

- H04W 36/0079: {in case of hand-off failure or rejection}
- H04W 36/02: Buffering or recovering information during reselection {; Modification of the traffic flow during hand-off}
- H04W 92/045: {between access point and backbone network device}
- H04W 36/0058: {Transmission of hand-off measurement information, e.g. measurement reports}
- H04W 92/20: between access points
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A synchronization method, a communication handover method, a radio network, and a RAN node are disclosed. The interface information synchronization method includes determining whether a condition for initiating interface information update is fulfilled. Information about the S1 interface between the RAN node and the core network node, is sent. In addition, or alternatively, information about the X2 interface between the RAN node and the neighboring RAN node is sent to the neighboring RAN node if the condition for initiating interface information update fulfilled.

## Claims

### Claim 1

A communications method, comprising:
receiving, by a second radio access network (RAN) node, information sent from a first RAN node through an interface between the first RAN node and the second RAN node, with the information indicating the first RAN node belongs to a mobility management entity pool, and the information being sent from the first RAN node in response to the first RAN node determining a condition has been fulfilled for sending the information; and
performing, by the second RAN node, an operation in accordance with the information.

### Claim 2 (depends on 1)

The method of claim 1, with the condition comprising a change in configuration of an interface of the first RAN node.

### Claim 3 (depends on 1)

The method of claim 1, with the condition comprising a change in state of an interface of the first RAN node.

### Claim 4 (depends on 1)

The method of claim 1, with the condition comprising a restarting of the first RAN node.

### Claim 5 (depends on 1)

The method of claim 1, further comprising:
performing, by the second RAN node, a handover to the first RAN node through the interface between the first RAN node and the second RAN node, with the second RAN node belonging to the mobility management entity pool.

### Claim 6 (depends on 1)

The method of claim 1, with the performing comprising:
storing, by the second RAN node, interface information of the first RAN node in accordance with the received information in response to a lack of interface information of the first RAN node in the second RAN node.

### Claim 7 (depends on 1)

The method of claim 1, with the performing comprising:
updating, by the second RAN node, interface information of the first RAN node in accordance with the received information in response to the interface information of the first RAN node being in the second RAN node.

### Claim 8

A second radio access network (RAN) node, comprising:
a receiver, configured to receive information sent from a first RAN node through an interface between the first RAN node and the second RAN node, with the information indicating the first RAN node belongs to a mobility management entity pool, and the information being sent from the first RAN node in response to the first RAN node determining a condition has been fulfilled for sending the information; and
a processor, configured to perform an operation in accordance with the information.

### Claim 9 (depends on 8)

The second RAN node of claim 8, with the condition comprising a change in configuration of an interface of the first RAN node.

### Claim 10 (depends on 8)

The second RAN node of claim 8, with the condition comprising a change in state of an interface of the first RAN node.

### Claim 11 (depends on 8)

The second RAN node of claim 8, with the condition comprising a restarting of the first RAN node.

### Claim 12 (depends on 8)

The second RAN node of claim 8, with the processor being further configured to perform a handover to the first RAN node through the interface between the first RAN node and the second RAN node, with the second RAN node belonging to the mobility management entity pool.

### Claim 13 (depends on 8)

The second RAN node of claim 8, with the processor being configured to store interface information of the first RAN node in accordance with the received information in response to a lack of interface information of the first RAN node in the second RAN node.

### Claim 14 (depends on 8)

The second RAN node of claim 8, with the processor being configured to update interface information of the first RAN node in accordance with the received information in response to the interface information of the first RAN node being in the second RAN node.