System and method for cell reselection in a mobile communication network

• US 7,949,337 B2
• Filed: 07/16/2007
• Issued: 05/24/2011
• Est. Priority Date: 05/30/2002
• Status: Expired due to Fees

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Choi, Yoon Seok
• Primary Examiner(s): Edouard; Patrick N
• Assistant Examiner(s): Casca; Fred A
• Application Number:
  US11/778,471
• Publication Number:
  US 20080014944A1
• Time in Patent Office: 1,408 Days
• Field of Search: 455/436, 455/442, 455/439, 455/440, 455/437, 455/438, 455/441, 455/443, 455/444
• US Class Current: 455/440
• CPC Class Codes: H04W 36/30 by measured or perceived connection quality data
• CPC Class Codes: H04W 36/302 due to low signal strength
• CPC Class Codes: H04W 52/0245 according to signal strength
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

A system and method for cell reselection in a radio communication network is provided. The system comprises a mobile terminal transmitting a receive signal strength list after measuring signal strengths of at least a neighbor cell; and a host system selecting a cell suitable for the mobile terminal based on a suitable cell list and the receive signal strength list and transmitting the cell reselection information to the mobile terminal. The suitable cell list comprises information representing whether or not the neighbor cell is suitable for selection by the mobile terminal.

Claims

1. A cell reselection method in which a host system provides a mobile terminal with information about a most suitable cell on which to camp, the method comprising:

performing, by the mobile terminal, a cell selection by camping on a cell which has the strongest receive signal strength among a plurality of neighboring cells after measuring signal strength of the plurality of neighboring cells;

transmitting, by the mobile terminal, registration information to the host system,

wherein the host system maintains a list of cells that are suitable for the mobile terminal to camp on based on the registration information provided by the mobile terminal, the list of cells including suitable cells and unsuitable cells,

wherein the registration information comprises information about at least terminal specification, a service type or a data transfer rate associated with the mobile terminal,

wherein the host system retrieves moving information of the mobile terminal according to changes in the registration information of the mobile terminal at predetermined time intervals,

wherein the host system, in response to retrieving the moving information, updates the list of cells such that a most suitable cell for the mobile terminal is identifiable when a cell reselection request is received from the mobile terminal;

scanning, by the mobile terminal, one or more cells neighboring the cell on which the mobile terminal is camping to determine respective signal strength of one or more neighboring cells when the mobile terminal is moved;

transmitting, by the mobile terminal, the cell reselection request comprising identity and signal strength data for the neighboring cells to the host system, in response to determining that signal strength of the cell on which the mobile terminal is camping has fallen below a threshold;

receiving, by the mobile terminal, a list comprising identity data for a target cell on which the mobile terminal is to camp from the host system, wherein the host system selects the most suitable cell for the mobile terminal as the target cell based on the updated list of cells.

2. The method of claim 1, wherein the host system stores information about a signal radius supported by the neighboring cells.

3. The method of claim 1, wherein the moving information of the mobile terminal is provided to the host system by a moving information key of the mobile terminal.

4. The method of claim 3, wherein the moving information is stored in a table in the host system.

5. The method of claim 1, wherein a neighbor cell with a larger radius is selected as the most suitable cell from the list of cells, if the moving information indicates that the mobile terminal is moving at a speed higher than a threshold.

6. The method of claim 1, wherein a neighbor cell with a smaller radius is selected as the most suitable cell from the list of cells if the data transfer rate for the mobile terminal is higher than a threshold.