# US 10,375,564 B2 · Method for updating area in wireless communication system, and device therefor

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- Number: US 10,375,564 B2
- Document ID: US10375564B2
- Status: Granted
- Kind: B2
- Application number: 15/543,920
- Filed: 2016-01-14
- Published: 2017-12-28
- Granted: 2019-08-06
- Earliest claimed: 2015-01-14
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Jinsook Ryu; Hyunsook Kim; Laeyoung Kim; Jaehyun Kim; Taehun Kim
- Web page: https://patentgrep.com/patent/US10375564B2

## CPC

- H04W 8/08: Mobility data transfer
- H04W 28/14: using intermediate storage
- H04W 52/02: Power saving arrangements
- H04W 52/0216: {using a pre-established activity schedule, e.g. traffic indication frame}
- H04W 52/0254: {detecting a user operation or a tactile contact or a motion of the device}
- H04W 8/12: between location registers or mobility servers
- H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX]
- H04W 88/16: Gateway arrangements
- Y02D 30/70: in wireless communication networks
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

A method for updating an area and a device for the same in a wireless communication system is disclosed. Particularly, a method for performing a Tracking Area Update (TAU) with a Mobility Management Entity (MME) change performed by a first MME in a wireless communication system may include receiving a Context Request message from a second MME during the TAU procedure and transmitting a Context Response message to the second MME in response to the Context Request message, wherein an indication that there are downlink data buffered in the S-GW may be included in the Context Response message when downlink data is buffered in a Serving Gateway (S-GW) and a buffering time of the downlink data in the S-GW is not expired.

## Claims

### Claim 1

A method for performing a Tracking Area Update (TAU) with a Mobility Management Entity (MME) change performed by a second MME in a wireless communication system, the method comprising:
transmitting a Context Request message to a first MME during the TAU procedure;
receiving a Context Response message from the first MME in response to the Context Request message; and
when the second MME receives information that there are downlink data buffered in a Serving Gateway (S-GW) through the Context Response message, performing an evolved terrestrial radio access network (E-UTRAN) Radio Access Bearer setup procedure in order to deliver the downlink data buffered in the S-GW even when a Downlink Data Notification (DDN) message is not received from the S-GW.

### Claim 2 (depends on 1)

The method of claim 1, wherein an information that there are downlink data buffered in the S-GW is included in the Context Response message, when the downlink data is buffered in the S-GW and a buffering time of the downlink data, which is stored in the first MME, is not expired.

### Claim 3 (depends on 2)

The method of claim 2, wherein the information that there are downlink data buffered in the S-GW is not included in the Context Response message, when a buffering time of the downlink data, which is stored in the first MME, expires.

### Claim 4

A second Mobility Management Entity (MME) performing a Tracking Area Update (TAU) with an MME change in a wireless communication system, the second MME comprising:
a transmitter and a receiver; and
a processor, operatively coupled to the transmitter and the receiver,
wherein the processor is configured to:
control the transmitter to transmit a Context Request message to a first MME during the TAU procedure;
control the receiver to receive a Context Response message from the first MME in response to the Context Request message; and
when the second MME receives information that there are downlink data buffered in a Serving Gateway (S-GW) through the Context Response message, perform an evolved terrestrial radio access network (E-UTRAN) Radio Access Bearer setup procedure in order to deliver the downlink data buffered in the S-GW even when a Downlink Data Notification (DDN) message is not received from the S-GW.