Mobility Management Method, User Equipment, and Base Station

• US 20180310206A1
• Filed: 06/29/2018
• Published: 10/25/2018
• 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
• Granted Patent: US 11,178,583 B2
• Time in Patent Office: 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 mobility management method, comprising:

allocating, by a first base station to which a first cell belongs, a source identifier to user equipment (UE) in a connected state in a first cell, wherein the source identifier comprises a first UE identifier used to identify the UE in the first base station; and

storing a connection context of the UE in the connected state after determining that the UE enters a low-overhead state, wherein the UE enters the low-overhead state when satisfying a preset activation condition, and the UE in the low-overhead state stores the connection context and camps on a cell according to a cell reselection criterion in a moving process.

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

3. The method according to claim 1, wherein the preset activation condition comprises:

the first base station sends, to the UE, a control instruction used to instruct the UE to enter the low-overhead state.

4. The method according to claim 1, further comprising:

sending, by the first base station to the UE, an instruction for permitting access by the UE in the low-overhead state.

5. A mobility management method, comprising:

receiving, by user equipment (UE) in a connected state in a first cell, a source identifier allocated by a first base station to which a first cell belongs, wherein the source identifier comprises a first UE identifier used to uniquely identify the UE in the first base station;

entering, by the UE, a low-overhead state when satisfying a preset 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, wherein the second cell is a serving cell on which the UE currently camps.

6. The method according to claim 5, wherein the source identifier comprises a first base station identifier used to uniquely identify the first base station and the first UE identifier used to uniquely identify the UE in the first base station.

7. The method according to claim 5, wherein the preset activation condition comprises:

the UE receives, from the first base station, a control instruction used to instruct to enter the low-overhead state.

8. The method according to claim 5, wherein after the entering, by the UE, a low-overhead state when satisfying a preset activation condition, the method further comprises:

exiting, by the UE, from the low-overhead state when satisfying a second preset condition; and

wherein the second preset condition comprises;

the UE sends the source identifier to the second base station and receives an access rejection instruction corresponding to the source identifier from the second base station.

9. The method according to claim 8, wherein the exiting, by the UE, from the low-overhead state when satisfying a second preset condition comprises:

deleting, by the UE, the connection context when satisfying the second preset condition, and entering an idle state.

10. The method according to claim 5, wherein before the reporting, by the UE when satisfying a first preset condition, the source identifier to a second base station to which a second cell belongs, the method further comprises:

receiving and reading, by the UE, a system information broadcast of the second cell; and

if the system information broadcast carries an instruction for permitting access by the UE in the low-overhead state, determining, by the UE according to the access instruction, to send the source identifier to the second base station.

11. A mobility management method, comprising:

receiving, by a second base station to which a second cell belongs, a source identifier reported by user equipment (UE) in a low-overhead state, wherein the UE in the low-overhead state stores a connection context of the UE in a connected state and camps on a cell according to a cell reselection criterion in a moving process, a first cell is a serving cell of the UE when the UE enters the low-overhead state, a second cell is a current serving cell of the UE, and the source identifier comprises a first UE identifier used to identify the UE in a first base station to which the first cell belongs; and

sending the first UE identifier to the first base station according to the source identifier, to instruct the first base station to learn that the current serving cell of the UE is the second cell.

12. The method according to claim 11, wherein the source identifier comprises a first base station identifier used to uniquely identify the first base station and the first UE identifier used to uniquely identify the UE in the first base station.

13. The method according to claim 11, wherein before the receiving, by a second base station to which a second cell belongs, a source identifier reported by user equipment (UE) in a low-overhead state, the method further comprises:

sending, by the second base station, a system information broadcast, wherein the system information broadcast carries an instruction for permitting access by the UE in the low-overhead state, so that the UE determines, according to the access instruction, whether to send the source identifier to the second base station.