TRANSMISSION TIMING CONTROL SYSTEM AND METHOD, AND MOBILE STATION FOR USE THEREIN

• US 20100232557A1
• Filed: 02/19/2007
• Published: 09/16/2010
• Est. Priority Date: 02/28/2006
• Status: Active Grant

• Current Assignee: NEC Corporation
• Original Assignee: NEC Corporation
• Inventors: Nakada, Suguru
• Granted Patent: US 8,116,795 B2
• Time in Patent Office: Days
• US Class Current: 375/354
• CPC Class Codes: H04W 56/0045 compensating for timing error by altering transmission time

Abstract

It is an object of the present invention to hold the detecting range of a timing correlator in a base station to the minimum required and to reduce the circuit scale and power requirement of the timing correlator. Before a mobile station transmits a data signal, it transmits a signal referred to as a preamble signal to measure the transmission timing to the base station. If the base station detects the preamble signal with a timing correlator having a limited circuit scale, then the base station transmits a transmission permission signal to the mobile station. If the mobile station fails to receive the transmission permission signal over a given period of time after it has transmitted the preamble signal, then the mobile station retransmits the preamble signal at a changed transmission timing based on the received electric power of a control signal transmitted continuously from the base station and information included in the control signal. The mobile station repeatedly retransmits the preamble signal until it receives the transmission permission signal. If the mobile station receives the transmission permission signal from the base station, then the mobile station transmits a data signal at the transmission timing of the preamble signal transmitted immediately prior to the reception of the transmission permission signal.

Claims

1. A data transmission timing control system for controlling the timing of data transmission from a mobile station to a base station, wherein said mobile station comprises:

means for transmitting a transmission permission request signal to said base station at a transmission timing represented by the sum of a periodic reference timing and an offset value;

means for, if a transmission permission signal transmitted from said base station in response to the reception by said base station of said transmission permission request signal is not received, retransmitting said transmission permission request signal repeatedly while changing the transmission timing until said transmission permission signal is received; and

means for, if said transmission permission signal is received, transmitting data at the transmission timing immediately before said transmission permission signal is received.

3. The data transmission timing control system according to claim 1, wherein a change in the transmission timing is determined depending on the radius of an area covered by said base station, the transmitted electric power at said base station of a control signal transmitted from said base station, the received electric power at said mobile station of the control signal, and the number of times that said transmission permission request signal is transmitted.

4. The data transmission timing control system according to claim 1, wherein said base station includes:

means for transmitting said transmission permission signal in response to the reception of said transmission permission request signal to said mobile station.

2. A data transmission timing control system for controlling the timing of data transmission from a mobile station to a base station, wherein said mobile station comprises:

means for transmitting a transmission permission request signal to said base station at a transmission timing represented by the sum of a periodic reference timing and an offset value;

means for, if a transmission permission signal transmitted from said base station in response to the reception by said base station of said transmission permission request signal is not received, changing said transmission timing once and retransmitting said transmission permission request signal repeatedly while changing the transmitted electric power until said transmission permission signal is received; and

means for, if said transmission permission signal is received, transmitting data at the transmission timing immediately before said transmission permission signal is received.

5. A data transmission timing control method for controlling the timing of data transmission from a mobile station to a base station, wherein said mobile station performs a process comprising:

the step of transmitting a transmission permission request signal to said base station at a transmission timing represented by the sum of a periodic reference timing and an offset value;

the step of, if a transmission permission signal transmitted from said base station in response to the reception by said base station of said transmission permission request signal is not received, retransmitting said transmission permission request signal repeatedly while changing the transmission timing until said transmission permission signal is received; and

the step of, if said transmission permission signal is received, transmitting data at the transmission timing immediately before said transmission permission signal is received.

7. The data transmission timing control method according to claim 5, wherein a change in the transmission timing is determined depending on the radius of an area covered by said base station, the transmitted electric power of a control signal at said base station transmitted from said base station, the received electric power at said mobile station of the control signal, and the number of times that said transmission permission request signal is transmitted.

8. The data transmission timing control method according to claim 5, wherein said base station performs a process including:

the step of transmitting said transmission permission signal in response to the reception of said transmission permission request signal to said mobile station.

6. A data transmission timing control method for controlling the timing of data transmission from a mobile station to a base station, wherein said mobile station performs a process comprising:

the step of transmitting a transmission permission request signal to said base station at a transmission timing represented by the sum of a periodic reference timing and an offset value;

the step of, if a transmission permission signal transmitted from said base station in response to the reception by said base station of said transmission permission request signal is not received, changing said transmission timing once and retransmitting said transmission permission request signal repeatedly while changing the transmitted electric power until said transmission permission signal is received; and

the step of, if said transmission permission signal is received, transmitting data at the transmission timing immediately before said transmission permission signal is received.

9. A mobile station comprising:

means for transmitting a transmission permission request signal to a base station at a transmission timing represented by the sum of a periodic reference timing and an offset value;

means for, if a transmission permission signal transmitted from said base station in response to the reception by said base station of said transmission permission request signal is not received, retransmitting said transmission permission request signal repeatedly while changing the transmission timing until said transmission permission signal is received; and

means for, if said transmission permission signal is received, transmitting data at the transmission timing immediately before said transmission permission signal is received.

11. The mobile station according to claim 9, wherein a change in the transmission timing is determined depending on the radius of an area covered by said base station, the transmitted electric power at said base station of a control signal transmitted from said base station, the received electric power at said mobile station of the control signal, and the number of times that said transmission permission request signal is transmitted.

10. A mobile station comprising:

means for transmitting a transmission permission request signal to said base station at a transmission timing represented by the sum of a periodic reference timing and an offset value;

means for, if a transmission permission signal transmitted from said base station in response to the reception by said base station of said transmission permission request signal is not received, changing said transmission timing once and retransmitting said transmission permission request signal repeatedly while changing the transmitted electric power until said transmission permission signal is received; and

means for, if said transmission permission signal is received, transmitting data at the transmission timing immediately before said transmission permission signal is received.

12. A program for enabling a computer to operate a mobile station for controlling the timing of data transmission to a base station, comprising:

a process for transmitting a transmission permission request signal to said base station at a transmission timing represented by the sum of a periodic reference timing and an offset value;

a process for, if a transmission permission signal transmitted from said base station in response to the reception by said base station of said transmission permission request signal is not received, retransmitting said transmission permission request signal repeatedly while changing the transmission timing until said transmission permission signal is received; and

a process for, if said transmission permission signal is received, transmitting data at the transmission timing immediately before said transmission permission signal is received.

14. The program according to claim 12, wherein a change in the transmission timing is determined depending on the radius of an area covered by said base station, the transmitted electric power at said base station of a control signal transmitted from said base station, the received electric power at said mobile station of the control signal, and the number of times that said transmission permission request signal is transmitted.

13. A program for enabling a computer to operate a mobile station for controlling the timing of data transmission to a base station, comprising:

a process for transmitting a transmission permission request signal to said base station at a transmission timing represented by the sum of a periodic reference timing and an offset value;

a process for, if a transmission permission signal transmitted from said base station in response to the reception by said base station of said transmission permission request signal is not received, changing said transmission timing once and retransmitting said transmission permission request signal repeatedly while changing the transmitted electric power until said transmission permission signal is received; and

a process for, if said transmission permission signal is received, transmitting data at the transmission timing immediately before said transmission permission signal is received.