METHOD FOR CONTROLLING HANDOVER IN WIRELESS COMMUNICATION SYSTEM, AND DEVICE THEREFOR

• US 20150163719A1
• Filed: 07/01/2013
• Published: 06/11/2015
• Est. Priority Date: 06/29/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Lim, Jaewon, Kim, Kijun
• Granted Patent: US 10,383,025 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04W 36/0058 Transmission of hand-off measurement information, e.g. measurement reports
• CPC Class Codes: H04W 36/08 Reselecting an access point
• CPC Class Codes: H04W 36/30 by measured or perceived connection quality data
• CPC Class Codes: H04W 36/38 by fixed network equipment
• CPC Class Codes: H04W 84/045 using private Base Stations, e.g. femto Base Stations, home Node B
• CPC Class Codes: H04W 92/20 between access points

Abstract

According to one embodiment of the present invention, disclosed is a method for a first pico base station for controlling handover between the first pico base station and a second pico base station in a wireless communication system. The method comprises the steps of: receiving, from user equipment, measurement results of a downlink reference signal of the second pico base station; and determining whether it is necessary to hand over to the second pico station based on the measurement results. If it is determined that it is necessary to handover to the second pico base station, the method may further comprise the steps of: sending an action switch request to the second pico base station; receiving setting data of the second pico base station for the action switch with the second pico base station; and changing the setting data of the first pico base station into the received setting data of the second pico base station.

Claims

1. A method for controlling handover between a first pico Base Station (BS) and a second pico BS in a wireless communication system, performed by the first pico BS, the method comprising:

receiving from a User Equipment (UE) a measurement result of a downlink Reference Signal (RS) which the UE has received from the second pico BS; and

determining whether handover to the second pico BS is needed based on the measurement result,

wherein if handover to the second pico BS is needed, the method further comprises

transmitting an operation switching request to the second pico BS,

receiving configuration information of the second pico BS, for operation switching with the second pico BS, and

changing configuration information of the first pico BS to the received configuration information of the second pico BS.

2. The method according to claim 1, further comprising maintaining an operation based on the configuration information of the first pico BS during an operation transition time configured for changing the configuration information of the first pico BS to the configuration information of the second pico BS.

3. The method according to claim 1, further comprising requesting information about the downlink RS of the second pico BS to the second pico BS and receiving the information about the downlink RS of the second pico BS from the second pico BS in response to the requesting.

4. The method according to claim 3, wherein the information about the downlink RS of the second pico BS is a cell Identifier (ID) of the second pico BS.

5. The method according to claim 3, wherein the information about the downlink RS of the second pico BS is Channel State Information Reference Signal (CSI-RS) configuration information of the second pico BS.

6. The method according to claim 1, further comprising, after the configuration information of the first pico BS is changed to the configuration information of the second pico BS, generating and transmitting a downlink RS using the configuration information of the second pico BS.

7. A method for controlling handover between a first pico Base Station (BS) and a second pico BS in a wireless communication system, performed by the first pico BS, the method comprising:

receiving from a User Equipment (UE) a measurement result of an uplink Reference Signal (RS) which the UE has transmitted to the second pico BS; and

determining whether handover to the second pico BS is needed based on the measurement result,

wherein if handover to the second pico BS is needed, the method further comprises

transmitting an operation switching request to the second pico BS,

receiving configuration information of the second pico BS, for operation switching with the second pico BS, and

changing configuration information of the first pico BS to the received configuration information of the second pico BS.

8. The method according to claim 7, further comprising maintaining an operation based on the configuration information of the first pico BS during an operation transition time configured for changing the configuration information of the first pico BS to the configuration information of the second pico BS.

9. The method according to claim 7, further comprising transmitting configuration information about the uplink RS of the UE to the second pico BS or the UE.

10. The method according to claim 7, further comprising, after the configuration information of the first pico BS is changed to the configuration information of the second pico BS, receiving configuration information about an uplink RS of a specific UE from the second pico BS and receiving the uplink RS from the specific UE based on the configuration information about the uplink RS of the specific UE.

11. A first pico Base Station (BS) for controlling handover between the first pico BS and a second pico BS in a wireless communication system, the first pico BS comprising:

a Radio Frequency (RF) unit; and

a processor configured to control the RF unit,

wherein the processor is configured to receive from a User Equipment (UE) a measurement result of a downlink Reference Signal (RS) which the UE has received from the second pico BS and to determine whether handover to the second pico BS is needed based on the measurement result, and

wherein if handover to the second pico BS is needed, the processor is configured to transmit an operation switching request to the second pico BS, to receive configuration information of the second pico BS, for operation switching with the second pico BS, and to change configuration information of the first pico BS to the received configuration information of the second pico BS.

12. A first pico Base Station (BS) for controlling handover between the first pico BS and a second pico BS in a wireless communication system, the first pico BS comprising:

a Radio Frequency (RF) unit; and

a processor configured to control the RF unit,

wherein the processor is configured to receive from a User Equipment (UE) a measurement result of an uplink Reference Signal (RS) which the UE has transmitted to the second pico BS and to determine whether handover to the second pico BS is needed based on the measurement result, and

wherein if handover to the second pico BS is needed, the processor is configured to transmit an operation switching request to the second pico BS, to receive configuration information of the second pico BS, for operation switching with the second pico BS, and to change configuration information of the first pico BS to the received configuration information of the second pico BS.