RANGING METHOD AND APPARATUS IN A COMMUNICATION SYSTEM WITH RELAY STATION, AND SYSTEM THEREOF

• US 20080064329A1
• Filed: 09/07/2007
• Published: 03/13/2008
• Est. Priority Date: 09/07/2006
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Yung-Soo, JUNG, Young-Ho, You, Cheol-Woo
• Granted Patent: US 7,925,207 B2
• Time in Patent Office: Days
• US Class Current: 455/18
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels

Abstract

A method for performing ranging by a mobile station in a communication system. The method includes transmitting a ranging sequence to a relay station; receiving an added signal of a reference sequence of the relay station and the ranging sequence, from the relay station; performing a correlation operation on each of the ranging sequence and the reference sequence in the added signal; estimating a time difference between the ranging sequence and the reference sequence depending on the correlation operation; and transmitting the signal to the relay station taking the time difference into account.

Claims

1. A ranging control method of a relay station in a communication system, the method comprising:

receiving a ranging sequence from a mobile station;

adding up the ranging sequence and a reference sequence that the relay station uniquely uses; and

transmitting the added signal to the mobile station.

2. The ranging control method of claim 1, wherein the ranging sequence is at least one of an initial ranging sequence, a periodic ranging sequence, and a bandwidth request ranging sequence.

3. The ranging control method of claim 1, wherein the added signal is transmitted taking into account at least one of a time that a base station desires to transmit a signal, a signal delay time between the base station and the relay station, a base station reference time, and a relay station reference time.

4. A ranging control method of a relay station in a communication system, the method comprising:

receiving a ranging sequence from a mobile station;

estimating a timing offset indicative of a difference between a reception time of the ranging sequence and a reference time;

performing decoding and regeneration on the ranging sequence, and adding up the ranging sequence and a reference sequence that a base station uniquely uses; and

transmitting the added signal to the mobile station.

5. The ranging control method of claim 4, wherein the ranging sequence is at least one of an initial ranging sequence, a periodic ranging sequence, and a bandwidth request ranging sequence.

6. The ranging control method of claim 4, wherein the adding up of the decoded and regenerated ranging sequence and the reference sequence is performed taking into account at least one of a time that the base station desires to transmit a signal, a signal delay time between the base station and the relay station, a base station reference time, and a relay station reference time.

7. A method for performing ranging by a mobile station in a communication system, the method comprising:

transmitting a ranging sequence to a relay station;

receiving an added signal of a reference sequence of the relay station and the ranging sequence, from the relay station;

performing a correlation operation on each of the ranging sequence and the reference sequence in the added signal;

estimating a time difference between the ranging sequence and the reference sequence depending on the correlation operation; and

transmitting the signal to the relay station taking the time difference into account.

8. The method of claim 7, wherein the ranging sequence is at least one of an initial ranging sequence, a periodic ranging sequence, and a bandwidth request ranging sequence.

9. A communication system for performing ranging, the system comprising:

a relay station; and

a mobile station,

wherein the relay station receives a ranging sequence from the mobile station, adds up the received ranging sequence and a reference sequence that the relay station uniquely uses, and transmits the added signal to the mobile station, and

wherein the mobile station receives the added signal from the relay station, estimates a time difference between the ranging sequence and the reference sequence through a correlation operation, and transmits a signal taking the estimated time difference into account.

10. The communication system of claim 9, wherein the ranging sequence is at least one of an initial ranging sequence, a periodic ranging sequence, and a bandwidth request ranging sequence.

11. The communication system of claim 9, wherein the relay station transmits the added signal taking into account at least one of a time that the base station desires to transmit a signal, a signal delay time between the base station and the relay station, a base station reference time, and a relay station reference time.

12. A ranging apparatus of a relay station, the apparatus comprising:

a receiver for receiving at least one ranging sequence;

a buffer for storing a ranging sequence output from the receiver;

a reference sequence generator for generating at least one reference sequence; and

a transmitter.

13. The ranging apparatus of claim 12, wherein the transmitter is configured for adding up the at least one reference sequence output from the reference sequence generator and the ranging sequence output from the buffer, and multiplying the added signal by a amplification factor before transmission.

14. The ranging apparatus of claim 13, further comprising:

a controller for controlling a reference sequence generation time of the reference sequence generator.

15. The ranging apparatus of claim 13, wherein the ranging sequence is at least one of an initial ranging sequence, a periodic ranging sequence, and a bandwidth request ranging sequence.

16. The ranging apparatus of claim 13, wherein the transmitter transmits the added signal taking into account at least one of a time that the base station desires to transmit a signal, a signal delay time between the base station and the relay station, a base station reference time, and a relay station reference time.

17. The ranging apparatus of claim 12, further comprising:

a ranging sequence generator for generating multiple ranging sequences; and

a correlator for correlating each of the multiple ranging sequences generated from the ranging sequence generator, with the ranging sequence received from the receiver.

18. The ranging apparatus of claim 17, wherein the transmitter is configured for adding up the ranging sequences correlated by correlator and the at least one reference sequence generated by the reference sequence generator, and transmitting the added signal.

19. The ranging apparatus of claim 18, wherein the transmitter adds up the ranging sequences and the at least one reference sequence taking into account at least one of a time that the base station desires to transmit a signal, a signal delay time between the base station and the relay station, a base station reference time, and a relay station reference time.