# US 10,484,912 B2 · Facilitating method for handover of a mobile communication device

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- Number: US 10,484,912 B2
- Document ID: US10484912B2
- Status: Granted
- Kind: B2
- Application number: 15/820,399
- Filed: 2017-11-21
- Published: 2018-05-17
- Granted: 2019-11-19
- Earliest claimed: 2006-08-22
- Assignees: NEC Corporation
- Applicants: NEC Corporation
- Inventors: Jagdeep Singh Ahluwalia
- Web page: https://patentgrep.com/patent/US10484912B2

## CPC

- H04W 36/0005: {Control or signalling for completing the hand-off}
- H04L 1/1874: {Buffer management}
- H04L 1/1887: {Scheduling and prioritising arrangements}
- H04W 36/0016: {Hand-off preparation specially adapted for end-to-end data sessions}
- H04W 36/02: Buffering or recovering information during reselection {; Modification of the traffic flow during hand-off}
- H04L 1/1664: {the supervisory signal being transmitted together with payload signals; piggybacking}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

A target node includes an S1 interface which includes an interface between the target node and a gateway, an X2 interface which includes an interface between a source node and the target node, and a transceiver which receives data from the S1 interface and data from the X2 interface. The transceiver sends the data from the X2 interface before sending the data from the S1 interface to a mobile device after the mobile device completes a handover from the source node to the target node.

## Claims

### Claim 1

A communication control method for a target eNB, the communication control method comprising:
receiving data from a gateway over an S1 interface and receiving data forwarded over an X2 interface, wherein the S1 interface is an interface between the target eNB and the gateway and the X2 interface is an interface between a source eNB and the target eNB;
transmitting, for a radio link control acknowledge mode bearer, to a user equipment (UE), downlink data from the X2 interface with the exception of data of which reception was acknowledged by the UE; and
sending, after transmitting the downlink data from the X2 interface, downlink data from the S1 interface.

### Claim 2

A target eNB comprising:
a receiver configured to receive data from a gateway over an S1 interface and to receive data forwarded over an X2 interface, wherein the S1 interface is an interface between the target eNB and the gateway and the X2 interface is an interface between a source eNB and the target eNB; and
a transmitter configured:
to transmit, for a radio link control acknowledge mode bearer, to a user equipment (UE), downlink data from the X2 interface with the exception of data of which reception was acknowledged by the UE, and
to send, after transmitting the downlink data from the X2 interface, downlink data from the S1 interface.