Method and apparatus for supporting handover in wireless communication system

Patent metadata

Field	Value
Publication number	US-10945184-B2
Application number	US-201716094651-A
Country	US
Kind code	B2
Filing date	Apr 18, 2017
Priority date	Apr 26, 2016
Publication date	Mar 9, 2021
Grant date	Mar 9, 2021

Abstract

The present invention relates to a method and an apparatus for supporting handover and, more particularly, to a method and an apparatus for adjusting handover related parameters. In order to achieve the above-described objective, a method for supporting handover by a base station in a wireless communication system, according to one embodiment of the present invention, comprises the steps of: transmitting a handover parameter to a terminal, based on a handover purpose; receiving, from the terminal, a handover measurement report based on the handover parameter; storing information for the handover purpose; and transmitting, to a target base station, a handover request message including the information for the handover purpose.

First claim

The invention claimed is:

1. A method by a base station for supporting a handover in a wireless communication system, the method comprising:
transmitting, to a terminal, a message configuring at least one handover parameter for each of a plurality of handover purposes;
receiving, from the terminal, a measurement report including first information on a measured result of handover parameters for a service based handover purpose among the plurality of handover purposes, and second information on service types used by the terminal;
storing the first information and the second information in a context of the terminal;
transmitting, to a target base station, a handover request message for the terminal;
determining a service type associated with a handover failure of the terminal from the service types, based on the first information and the second information, in case that the handover failure of the terminal is detected; and
adjusting at least one handover parameter associated with the determined service type.

2. The method of claim 1 , further comprising:
detecting the handover failure of the terminal based on a radio link failure (RLF) indication being received from the terminal or another base station, or a handover report being received from the target base station.

3. The method of claim 2 , wherein the handover request message includes the first information and the second information.

4. The method of claim 3 , wherein the information for the specific handover purpose is included in the handover request message, based on an indication included in the measurement report, wherein the indication indicates whether the first information and the second information are required to be transferred to the target base station.

5. The method of claim 1 , further comprising:
storing handover related information based on the received measurement report,
wherein the handover related information includes at least one of information for a handover initiation condition, and information for a terminal identification.

6. A method by a base station for supporting handover in a wireless communication system, the method comprising:
receiving, from a source base station, a handover request message for a terminal;
storing, if first information on a measured result of handover parameters for a service based handover purpose and among a plurality of handover purposes, and second information on service types used by the terminal are included in the handover request message, the first information and the second information; and
transmitting, to the source base station, a handover report including the first information and the second information, based on a handover failure of the terminal,
wherein the handover failure is detected based on the handover report,
wherein a service type associated with the handover failure of the terminal is determined from the service types based on the first information and the second base station, and
wherein at least one handover parameter associated with the determined service type is adjusted in the source base station.

7. The method of claim 6 , further comprising:
receiving, from the terminal, a reconnection request,
wherein the handover report is transmitted to the source base station based on the reconnection request.

8. The method of claim 6 , further comprising:
storing, if handover related information is included in the handover request message, the handover related information,
wherein the handover related information includes at least one of information for a handover initiation condition, and information for a terminal identification.

9. A base station for supporting handover in a wireless communication system, comprising:
a transceiver configured to transmit and receive signals; and
a controller configured to:
control the transceiver to transmit, to a terminal, a message configuring at least one handover parameter for each of a plurality of handover purposes;
control the transceiver to receive, from the terminal, a measurement report including first information on a measured result of handover parameters for a service based handover purpose among the plurality of handover purposes, and second information on service types used by the terminal;
store the first information and the second information in a context of the terminal;
control the transceiver to transmit, to a target base station, a handover request message for the terminal;
determine service type associated with a handover failure of the terminal from the service types, based on the first information and the second information, in case that the handover failure of the terminal is detected; and
adjust at least one handover parameter associated with the determined service type.

10. The base station of claim 9 , wherein the controller is configured to detect the handover failure of the terminal based on a radio link failure (RLF) indication being received from the terminal or another base station, or a handover report being received from the target base station.

11. The base station of claim 10 , wherein the handover request message includes the first information and the second information.

12. The base station of claim 11 , wherein the information for the specific handover purpose is included in the handover request message, based on an indication included in the measurement report, wherein the indication indicates whether the first information and the second information are required to be transferred to the target base station.

13. The base station of claim 9 , wherein the controller is configured to store handover related information based on the received handover measurement report,
wherein the handover related information includes at least one of information for a handover initiation condition, and information for a terminal identification.

14. A base station for supporting handover in a wireless communication system, comprising:
a transceiver configured to transmit and receive signals; and
a controller configured to:
control the transceiver to receive, from a source base station, a handover request message for a terminal;
store, if first information on a measured result of handover parameters for a service based handover purpose and among a plurality of handover purposes, and second information on service types used by the terminal are included in the handover request message, the first information and the second information; and
control the transceiver to transmit, to the source base station, a handover report including the first information and the second information, based on a handover failure of the terminal,

wherein, when a reconnection request is received by the transceiver from the terminal, the controller is configured to control the transceiver to transmit, to the source base station, a handover report including the information for the specific handover purpose,
wherein the handover failure is detected based on the handover report,
wherein a service type associated with the handover failure of the terminal is determined from the service types based on the first information and the second base station, and
wherein at least one handover parameter associated with the determined service type is adjusted in the source base station.

15. The base station of claim 14 , wherein, if handover related information is included in the handover request message, the controller is configured to store the handover related information, and
wherein the handover related information includes at least one of information for a handover initiation condition, and information for a terminal identificatio

Assignees

• Samsung Electronics Co Ltd

Inventors

• Cha Hwajin
• Bae Suengjae
• Choi Bumgon

Classifications

• H04W36/302

  due to low signal strength · CPC title

• H04W36/00837

  Determination of triggering parameters for hand-off · CPC title

• H04W36/0083

  Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists · CPC title

• H04W36/305 Primary

  Handover due to radio link failure (control signalling for hand-off failure H04W36/0079) · CPC title

• H04W88/08

  Access point devices · CPC title