# US 2013/0157712 A1 · Method of managing mobility using coordinated multiple point communication

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- Number: US 2013/0157712 A1
- Document ID: US20130157712A1
- Status: Published application
- Kind: A1
- Application number: 13/613,570
- Filed: 2012-09-13
- Published: 2013-06-20
- Earliest claimed: 2011-12-15
- Assignees: Electronics and Telecommunications Research Institute
- Inventors: SoonGi PARK; Byung-Han RYU; Nam Hoon PARK; Jun Sik KIM; Sang Chul OH; Hong Soog KIM; Kyung Sook KIM; Young Jick BAHG; Sung Gu CHOI
- Web page: https://patentgrep.com/patent/US20130157712A1

## CPC

- H04B 7/024: Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
- H04W 36/08: Reselecting an access point
- H04W 36/18: for allowing seamless reselection, e.g. soft reselection
- H04B: TRANSMISSION
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Provided is a method of managing mobility of a user equipment. The method includes: establishing by a first base station a communication with the user equipment; transmitting by the first base station a Coordinated Multiple Point (CoMP) addition request to a second base station; establishing by the first and second base stations a CoMP communication with the user equipment according to the CoMP addition request; transmitting by the first base station an anchor cell change request to the second base station; and operating the second base station as an anchor cell of the CoMP communication according to the anchor cell switch request.

## Claims

### Claim 1

A method of managing mobility of a user equipment, the method comprising:
establishing by a first base station a communication with the user equipment;
transmitting by the first base station a Coordinated Multiple Point (CoMP) addition request to a second base station;
establishing by the first and second base stations a CoMP communication with the user equipment according to the CoMP addition request;
transmitting by the first base station an anchor cell change request to the second base station; and
operating the second base station as an anchor cell of the CoMP communication according to the anchor cell switch request.

### Claim 2 (depends on 1)

The method of claim 1, wherein the anchor cell switch request is transmitted through a sidehaul or backhaul communication.

### Claim 3 (depends on 1)

The method of claim 1, wherein the CoMP addition request is transmitted through a sidehaul or backhaul communication.

### Claim 4 (depends on 1)

The method of claim 1, wherein the CoMP addition request comprises information on an activation time that the second base station starts the CoMP communication to the user equipment.

### Claim 5 (depends on 4)

The method of claim 4, wherein the second base station starts the CoMP communication to the user equipment at the activation time.

### Claim 6 (depends on 1)

The method of claim 1, wherein the second base station requests a parent server to add it to a data transmission path that communicates with the user equipment.

### Claim 7 (depends on 1)

The method of claim 1, wherein the first base station forwards downlink data that are to be transmitted to the user equipment to the second base station.

### Claim 8 (depends on 1)

The method of claim 1, wherein when the first and second base stations provide the CoMP communication to the user equipment, retransmitting error data is performed only by an anchor cell.

### Claim 9 (depends on 1)

The method of claim 1, further comprising requesting by the second base station a parent server to switch a data transmission path to the second base station.

### Claim 10 (depends on 1)

The method of claim 1, further comprising:
transmitting by the second base station a CoMP communication deletion request to the first base station; and
disconnecting with the user equipment by the first base station in response to the CoMP communication deletion request.

### Claim 11 (depends on 10)

The method of claim 10, further comprising requesting by the first base station to a parent server to delete the first station from a data transmission path communicated with the user equipment.

### Claim 12 (depends on 1)

The method of claim 1, wherein the CoMP addition request is transmitted to the second base station according to a signal intensity of the first base station.

### Claim 13 (depends on 1)

The method of claim 1, wherein the CoMP addition request is transmitted to the second base station according to a signal intensity of the second base station.

### Claim 14 (depends on 1)

The method of claim 1, wherein the anchor cell switch request is transmitted to the second base station according to signal intensities of the first and second base stations.

### Claim 15 (depends on 1)

The method of claim 1, wherein when a third base station is added to the CoMP communication, the anchor cell notifies the user equipment and the first base station that a third base station is added, and transmits information on the first and second base stations to the third base station.

### Claim 16 (depends on 15)

The method of claim 15, wherein the anchor cell transmits information on which cell is an anchor cell to the third base station.