Timing of synchronizing signal

• US 8,825,075 B2
• Filed: 07/16/2009
• Issued: 09/02/2014
• Est. Priority Date: 08/14/2008
• Status: Active Grant

• Current Assignee: NEC Platforms, Ltd. (NEC Corporation)
• Original Assignee: NEC Access Technica Limited (NEC Corporation), NEC Corporation
• Inventors: Katayama, Hideyuki, Yahagi, Masahiko
• Primary Examiner(s): Rampuria, Sharad
• Assistant Examiner(s): Zewari, Sayed T
• Application Number:
  US13/055,812
• Publication Number:
  US 20110130154A1
• Time in Patent Office: 1,874 Days
• Field of Search: 455/456.1, 455/456.2, 455/456.3, 455/456.4, 455/456.5, 455/456.6, 455/501, 455/502
• US Class Current: 455/456.1
• CPC Class Codes: H04W 56/006 using known positions of transmitter and receiver
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Time information and positional information indicating the position at which a communication terminal is present are acquired from a GPS satellite, and, based on the acquired positional information and correspondence information which provides the association correspondence between the positional information indicating a position identified by latitude and longitude and the timing of a synchronizing signal for establishing synchronization at the position, the timing of the synchronizing signal for establishing synchronization between the communication terminal and the radio base station is identified.

Claims

1. A communication terminal having a radio communicating function, comprising:

a GPS module that acquires time information and positional information from a GPS satellite, indicating the position at which the communication terminal is present;

a controller which, based on the positional information acquired by the GPS module and correspondence information which provides the association between the positional information indicating a position of a radio base station to be connected to the communication terminal identified by latitude and longitude and the timing of a synchronizing signal for establishing synchronization at the position, identifies the timing of the synchronizing signal for establishing synchronization between the communication terminal and the radio base station; and

a receiver that, from a server that stores the correspondence information, acquires correspondence information included in the range determined by the controller based on the positional information acquired by the GPS module, wherein

the controller, based on the positional information acquired by the GPS module and the correspondence information acquired by the receiver, identifies the timing of the synchronizing signal for establishing synchronization between the communication terminal and the radio base station, and

the controller, based on a part of bits of each of latitude and longitude as the positional information acquired by the GPS module, refers to the correspondence information acquired by the receiver, and identifies the timing of the synchronizing signal for establishing synchronization between the communication terminal and the radio base station.

2. The communication terminal according to claim 1, further comprising a storage that stores the correspondence information acquired by the receiver, wherein

the controller, based on a part of the positional information acquired by the GPS module and the correspondence information stored in the storage, calculates and identifies the timing of the synchronizing signal for establishing synchronization between the communication terminal and the radio base station.

3. The communication terminal according to claim 1, wherein the communication terminal is connected to a WiMAX network through the radio base station.

4. A connecting method for connecting a communication terminal to a network through a radio base station, comprising the steps of:

acquiring time information and positional information from a GPS satellite, indicating the position at which the communication terminal is present;

based on the acquired positional information and correspondence information which provides the association between the positional information indicating a position of the radio base station identified by latitude and longitude and the timing of a synchronizing signal for establishing synchronization at the position, identifying the timing of the synchronizing signal for establishing synchronization between the communication terminal and the radio base station;

determining a range for which the correspondence information is acquired based on the acquired positional information;

acquiring correspondence information included in the range from a server that stores the correspondence information;

identifying the timing of the synchronizing signal for establishing synchronization between the communication terminal and the radio base station, based on the acquired positional information and the correspondence information included in the range; and

identifying the timing of the synchronizing signal for establishing synchronization between the communication terminal and the radio base station, by referring to the correspondence information included in the range based on a part of bits of each of latitude and longitude as the acquired positional information.

5. The connecting method according to claim 4, further comprising the steps of:

storing correspondence information included in the range into the communication terminal; and

,

calculating and identifying the timing of the synchronizing signal for establishing synchronization between the communication terminal and the radio base station, based on a part of the acquired positional information and the stored correspondence information.

6. A non-transitory computer-readable storage medium storing a program that causes a communication terminal having a radio communication function to execute:

a procedure of acquiring time information and positional information from a GPS satellite, indicating the position at which the communication terminal is present;

a procedure of, based on the acquired positional information and correspondence information which provides the association between the positional information indicating a position of a radio base station to be connected to the communication terminal identified by latitude and longitude and the timing of a synchronizing signal for establishing synchronization at the position, identifying the timing of the synchronizing signal for establishing synchronization between the communication terminal and the radio base station;

a procedure of determining a range for which the correspondence information is acquired based on the acquired positional information;

a procedure of acquiring correspondence information included in the range from a server that stores the correspondence information;

a procedure of identifying the timing of the synchronizing signal for establishing synchronization between the communication terminal and the radio base station, based on the acquired positional information and the correspondence information included in the range; and

a procedure of identifying the timing of the synchronizing signal for establishing synchronization between the communication terminal and the radio base station, by referring to the correspondence information included in the range based on a part of bits of each of latitude and longitude as the acquired positional information.

7. The non-transitory computer-readable storage medium according to claim 6, storing the program that causes the communication terminal to execute:

a procedure of storing correspondence information included in the range into the communication terminal; and

,

a procedure of calculating and identifying the timing of the synchronizing signal for establishing synchronization between the communication terminal and the radio base station, based on a part of the acquired positional information and the stored correspondence information.