Control device of mobile communication system

• US 7,720,478 B2
• Filed: 03/25/2003
• Issued: 05/18/2010
• Est. Priority Date: 03/26/2002
• Status: Expired due to Fees

• Current Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Original Assignee: NTT Docomo Incorporated (Nippon Telegraph and Telephone Corporation)
• Inventors: Futakata, Toshiyuki, Dohi, Tomohiro, Ishii, Hiroyuki, Yamada, Mayu, Moon, Sung Uk, Ishiguro, Takayuki
• Primary Examiner(s): ADDY, THJUAN KNOWLIN
• Application Number:
  US10/395,088
• Publication Number:
  US 20040203786A1
• Time in Patent Office: 2,611 Days
• Field of Search: 455/436, 455/428, 455/433, 455/456.1, 455/440, 455/466, 455/458, 455/439, 455/443, 342/357.03, 370/331, 370/445, 370/310, 370/281, 370/310.1
• US Class Current: 455/436
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface
• CPC Class Codes: H04W 36/32 by location or mobility data, e.g. speed data
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

There is provided a control device enabling switching of communication of a mobile terminal with one system to communication with another system while reducing power consumption and workload of the mobile terminal. The control device is used in a communication system including a first mobile communication system, a second mobile communication system, and a mobile terminal being in communication with the first mobile communication system. The control device comprises a position measuring unit for measuring the position of the mobile terminal, a judgment unit for making a determination whether or not to switch the communication of the mobile terminal from the first mobile communication system to the second mobile communication system according to a position measurement result of the position measuring unit, and a switching unit for performing the above switching operation according to the determination of the judgment unit.

Claims

1. A control device of a communication system including a first base station and a second base station, wherein a separate mobile terminal is in communication with the first base station using a first transmission method, and able to communicate with the second base station using a second transmission method, the control device comprising:

a position measuring unit configured to measure a geographic position of the mobile terminal;

a judgment unit configured to determine whether or not to switch the communication of the mobile terminal from the first base station to the second base station according to a combination of a position of the mobile terminal measured by the position measuring unit, a position change of the mobile terminal, and at least contents of communications; and

a switching unit configured to switch the communication of the mobile terminal from the first base station to the second base station according to the determination of the judgment unit,

wherein a communication protocol upper layer of a physical layer of the first base station is at least partially the same as a communication protocol upper layer of a physical layer of the second base station.

2. The control device as claimed in claim 1, further comprising a position data table including data for selecting one of the first base station and the second base station according to the geographic position of the mobile terminal, wherein said judgment unit makes said determination by using the position data table.

3. The control device as claimed in claim 1, wherein the judgment unit is configured to determine whether or not to switch the communication of the mobile terminal from the first transmission method to the second transmission method according to a present position and a previous position of the mobile terminal, measured by the position measuring unit.

4. The control device as claimed in claim 1, wherein the first transmission method is one of a frequency division duplex transmission method and a time division duplex transmission method;

and

the second transmission method is the other one of the frequency division duplex transmission method and the time division duplex transmission method.