Mobility management method for low overhead state

• US 11,178,583 B2
• Filed: 06/29/2018
• Issued: 11/16/2021
• Est. Priority Date: 12/31/2015
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Li, Bingzhao, Quan, Wei, Zhang, Jian, Liu, Weihua
• Primary Examiner(s): Moore, Ian N
• Assistant Examiner(s): McCallum, Latresa A
• Application Number:
  US16/023,856
• Publication Number:
  US 20180310206A1
• Time in Patent Office: 1,236 Days
• CPC Class Codes: H04W 36/0033 with transfer of context information
• CPC Class Codes: H04W 36/0061 of neighbour cell information
• CPC Class Codes: H04W 48/10 using broadcasted information
• CPC Class Codes: H04W 52/0209 in terminal devices terminal devices per se H04W88/02
• CPC Class Codes: H04W 76/19 Connection re-establishment
• CPC Class Codes: H04W 76/20 Manipulation of established connections
• CPC Class Codes: H04W 76/27 Transitions between radio resource control [RRC] states
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Embodiments of the present invention disclose a mobility management method, user equipment, and a base station. The mobility management method may include: receiving, by the user equipment (UE) in a connected state, a source identifier of the UE from a first base station, where the source identifier is used to uniquely identify the UE in the first base station; entering, by the UE, a low-overhead state after satisfying a low-overhead activation condition; storing, by the UE in the low-overhead state, a connection context of the UE in the connected state, and camping on a cell according to a cell reselection criterion in a moving process; and reporting, by the UE when satisfying a first preset condition, the source identifier to a second base station to which a second cell belongs, where the second cell is a serving cell on which the UE currently camps.

Claims

1. A method by a first base station, comprising:

allocating a source identifier for a user equipment (UE) in a connected state in the first base station, wherein the source identifier comprises a first UE identifier used to identify the UE;

indicating the UE to enter a low-overhead state, wherein the low-overhead state is a state in which a connection context of the UE is stored in the UE and a mobility of the UE is based on a cell reselection criterion;

storing the connection context of the UE;

receiving, by the first base station, downlink data for the UE;

in response to receiving the downlink data for the UE which has entered the low-overhead state, sending a paging message to a second base station that belongs to the same paging region as the first base station, wherein the paging message to prompt the second base station to page the UE, and the paging message comprises the source identifier and a second paging parameter, and the second paging parameter comprises at least one of a paging index of the UE and a DRX parameter; and

receiving, before receiving the downlink data for the UE, a first paging parameter from a core network through an initial context establishment message, a context modification message, or a handover request message, wherein the first paging parameter comprises a paging index of the UE or a DRX parameter of the UE.

2. The method according to claim 1, wherein the source identifier further comprises a first base station identifier used to uniquely identify the first base station.

3. A communication system, comprising:

a first base station, which is in communication with a core network and a second base station, and

wherein the first base station is configured to;

allocate a source identifier for a user equipment (UE) in a connected state, wherein the source identifier comprises a first UE identifier used to identify the UE in the first base station;

indicate the UE to enter a low-overhead state, wherein the low-overhead state is a state in which a connection context of the UE is stored in the UE and a mobility of the UE is based on a cell reselection criterion;

store the connection context of the UE;

receive downlink data for the UE;

in response to the downlink data for the UE which has entered the low-overhead state, send a paging message to a second base station that belongs to the same paging region as the first base station, wherein the paging message to prompt the second base station to page the UE, and the paging message comprises the source identifier and a second paging parameter, and the second paging parameter comprises at least one of a paging index of the UE and a DRX parameter; and

receive, before receiving the downlink data for the UE, a first paging parameter from the core network through an initial context establishment message, a context modification message, or a handover request message, wherein the first paging parameter comprises a paging index of the UE or a DRX parameter of the UE.

4. The system according to claim 3 further comprising the core network, configured to send the first paging parameter to the first base station.

5. The system according to claim 4 further comprising the second base station, configured to receive the paging message from a first base station.

6. The system according to claim 5, wherein the second base station is further configured to page the UE.

7. A non-transitory computer-readable storage medium storing a program to be executed by the processor, the program including instructions for:

allocating a source identifier for a user equipment (UE) in a connected state in the first base station, wherein the source identifier comprises a first UE identifier used to identify the UE;

indicating the UE to enter a low-overhead state, wherein the low-overhead state is a state in which a connection context of the UE is stored in the UE and a mobility of the UE is based on a cell reselection criterion;

storing the connection context of the UE;

receiving, by the first base station, downlink data for the UE;

in response to receiving the downlink data for the UE which has entered the low-overhead state, sending a paging message to a second base station that belongs to the same paging region as the first base station, wherein the paging message to prompt the second base station to page the UE, and the paging message comprises the source identifier and a second paging parameter, and the second paging parameter comprises at least one of a paging index of the UE and a DRX parameter; and

receiving, before receiving the downlink data for the UE, a first paging parameter from a core network through an initial context establishment message, a context modification message, or a handover request message, wherein the first paging parameter comprises a paging index of the UE or a DRX parameter of the UE.

8. The medium according to claim 7, wherein the source identifier further comprises a first base station identifier used to uniquely identify the first base station.