Communication terminal out of range determination method, wireless communication system switching method and communication terminal

• US 7,801,516 B2
• Filed: 05/14/2004
• Issued: 09/21/2010
• Est. Priority Date: 05/29/2003
• Status: Expired due to Fees

• Current Assignee: Kyocera Corporation
• Original Assignee: Kyocera Corporation
• Inventors: Saito, Masahiro
• Primary Examiner(s): RAMPURIA, SHARAD K
• Application Number:
  US10/846,743
• Publication Number:
  US 20040242218A1
• Time in Patent Office: 2,321 Days
• Field of Search: 455/552.1, 455/67.11, 455/522, 455/69, 455436-437, 455421-423, 455/453, 455/525, 455/456.1, 455/422.1, 340/539.21, 340/505, 128/903, 370/331
• US Class Current: 455/421
• CPC Class Codes: H04W 36/32 by location or mobility data, e.g. speed data
• CPC Class Codes: H04W 36/326 by proximity to another entity
• CPC Class Codes: H04W 36/362 Conditional handover
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 76/20 Manipulation of established connections

Abstract

There is provided a communication terminal out of range determination method, a wireless communication system switching method and a communication terminal, capable of determining accurately whether or not a communication terminal is out of range. Determining whether or not the communication terminal is out of range is based on a transmission level of a transmission signal from the communication terminal to a base station.

Claims

1. A mobile communication terminal out of range determination method comprising:

transmitting at a transmission level which exceeds a predetermined threshold;

receiving an instruction to raise the transmission level of the mobile communication terminal from a base station while the mobile communication terminal is transmitting at the transmission level which exceeds the predetermined threshold; and

determining that the mobile communication terminal is out of range based on the instruction, wherein the out of range determination is made by the mobile communication terminal.

2. The communication terminal out of range determination method according to claim 1, wherein the transmission level is a transmission power level.

3. The communication terminal out of range determination method according to claim 1, wherein the step of determining that the communication terminal is out of range when the communication terminal receives the instruction further comprises the step of determining that the communication terminal is out of range if a reception level of the communication terminal is below a constant.

4. A mobile communication terminal comprising:

a transmission unit which transmits to a base station;

a receive unit which receives an instruction to raise a transmission level of the mobile communication terminal from a base station;

a control unit which controls a transmission level on the transmission unit based on the instruction;

a storage unit which stores a predetermined threshold value; and

a determination unit which determines that the mobile communication terminal is out of range, based on the transmission level, the threshold value, and the instruction, wherein the out of range determination is made by the mobile communication terminal.

5. The communication terminal according to claim 4, wherein the transmission level is a transmission power level.

6. The communication terminal according to claim 4 further comprising a reception unit which receives from the base station,

wherein the determination unit determines the communication terminal is out of range if a reception level of the communication terminal is below a constant.