Method for handover with consideration of load status of cells

• US 8,472,408 B2
• Filed: 04/17/2009
• Issued: 06/25/2013
• Est. Priority Date: 04/24/2008
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Gi Won, Lee, Jin, Kim, Yong Ho, Ryu, Ki Seon
• Primary Examiner(s): NGUYEN, ANH NGOC M
• Application Number:
  US12/989,343
• Publication Number:
  US 20110032909A1
• Time in Patent Office: 1,530 Days
• Field of Search: 370/331, 370/332, 370/310.2, 370/338, 370/252, 370/310, 370/313, 370/315, 370/328, 370/333, 455/432.1, 455/436, 455/437, 455/440, 455/442, 455/444
• US Class Current: 370/332
• CPC Class Codes: H04W 36/22 for handling the traffic

Abstract

A method for a handover with consideration of load status of cells is disclosed. The method for intra handover with consideration of load status of cells by a mobile station in a wireless communication system includes receiving a neighbor advertisement (MOB-NBR-ADV) message including load status information of neighbor cells from a serving base station, and performing intra handover according to the load status information of neighbor cells if there is at least a neighbor cell of which channel quality is equal to or higher than a handover threshold for a time duration among neighbor cells in an intra network.

Claims

1. A method for inter handover with consideration of load status of cells by a mobile station in a wireless communication system, the method comprising:

receiving a down link channel descriptor (DCD) message and a neighbor advertisement (MOB-NBR-ADV) message from a serving base station, the DCD message comprising a first load status field that indicates whether a load status of a cell of the serving base station is heavy, the MOB-NBR-ADV message comprising a second load status field that indicates whether a load status of an intra neighbor cell is heavy;

scanning neighbor cells in an inter network if channel quality of the serving base station is less than a scanning threshold, the first load status field indicates the load status of the cell of the serving base station is heavy, and the second load status field indicates the load status of the intra neighbor cell is heavy; and

performing inter handover based on load status of the neighbor cells in the inter network and a result of the scanning.

2. The method of claim 1, wherein performing inter handover comprises performing handover to a cell having a load status that is not heavy.

3. The method of claim 1, wherein scanning neighbor cells comprises scanning cells of a recommended cells list made based on the load status of the neighbor cells and a location of the mobile station (LBS).

4. A method for inter handover with consideration of load status of cells by a mobile station in a wireless communication system, the method comprising:

receiving a down link channel descriptor (DCD) message and a neighbor advertisement (MOB-NBR-ADV) message from a serving base station, the DCD message comprising a first load status field that indicates whether a load status of a cell of the serving base station is heavy, the MOB-NBR-ADV message comprising a second load status field that indicates whether a load status of an intra neighbor cell is heavy;

scanning neighbor cells in an inter network if the first load status field indicates the load status of the cell of the serving base station is heavy and the second load status field indicates the load status of the intra neighbor cell is heavy;

performing pre-registration based on a result of the scanning; and

performing inter handover based on channel quality and load status of neighbor cells to which the mobile station performed pre-registration if channel quality of the serving base station is less than a scanning threshold.

5. The method of claim 4, wherein performing inter handover comprises performing handover to a cell having a load status that is not heavy.