METHOD OF RESOLVING OVERLAPS IN DATA TRANSMISSION AND USER EQUIPMENT THEREFOR

• US 20100128693A1
• Filed: 01/12/2010
• Published: 05/27/2010
• Est. Priority Date: 01/11/2008
• Status: Active Grant

• Current Assignee: Bin-Chul Ihm, Joon Kui Ahn, Ki Jun Kim, Young Woo Yun
• Original Assignee: Bin-Chul Ihm, Joon Kui Ahn, Ki Jun Kim, Young Woo Yun
• Inventors: KIM, Ki Jun, AHN, Joon Kui, YUN, Young Woo, IHM, Bin Chul
• Granted Patent: US 8,767,706 B2
• Time in Patent Office: Days
• US Class Current: 370/330
• CPC Class Codes: H04L 27/2646 using feedback from receiver for adjusting OFDM transmission parameters, e.g. transmission timing or guard interval length
• CPC Class Codes: H04L 27/2655 Synchronisation arrangements
• CPC Class Codes: H04W 56/003 Arrangements to increase tolerance to errors in transmission or reception timing
• CPC Class Codes: H04W 56/0045 compensating for timing error by altering transmission time
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 88/02 Terminal devices

Abstract

A user equipment and corresponding method of transmitting symbol by the user equipment in a wireless communication. The user equipment transmits a plurality of symbols to a base station, each symbol including a cyclic prefix and a data part. The method includes: receiving a timing adjustment command from the base station, the timing adjustment command advancing a transmission timing of symbol after a predetermined time; and transmitting a timing adjusted symbol to the base station. A length of the timing adjusted symbol is varied so that the timing adjusted symbol does not include an overlapping part with a previous symbol.

Claims

1. A method of transmitting symbol by a user equipment in a wireless communication, wherein the user equipment transmits a plurality of symbols to a base station, each symbol including a cyclic prefix and a data part, the method comprising:

receiving a timing adjustment command from the base station, the timing adjustment command advancing a transmission timing of symbol after a predetermined time; and

transmitting a timing adjusted symbol to the base station,

wherein a length of the timing adjusted symbol is varied so that the timing adjusted symbol does not include an overlapping part with a previous symbol.

2. The method of claim 1, wherein the symbol includes an orthogonal frequency division multiple access (OFDMA) symbol or a single carrier frequency division multiple access (SC-FDMA) symbol.

3. The method of claim 1, wherein the timing adjustment command advances the transmission timing of the symbol by a certain step.

4. The method of claim 1, wherein the length of the timing adjusted symbol is varied in consideration of a value of the timing adjustment command.

5. The method of claim 1, wherein the length of the timing adjusted symbol is shorter than its original length.

6. The method of claim 1, wherein a variance of the timing adjusted symbol in its length is the same as or longer than a length of a cyclic prefix.

7. The method of claim 1, wherein a variance of the timing adjusted symbol in its length is shorter than a length of the cyclic prefix.

8. The method of claim 1, wherein the cyclic prefix includes an unextended cyclic prefix or an extended cyclic prefix.

9. The method of claim 1, wherein the timing adjustment command is applied from the first positioned symbol in a subframe.

10. A user equipment in a wireless communication system, wherein the user equipment transmits a plurality of symbols to a base station, each symbol including a cyclic prefix and a data part, the user equipment comprising:

a wireless communication unit configured to transmit symbols at a given transmission timing to the base station and configured to receive a transmission timing adjustment command from the base station, the timing adjustment command advancing transmission timing of symbol after a predetermined time; and

a symbol generation unit configured to generate symbols,

wherein a length of the timing adjusted symbol is varied so that the timing adjusted symbol does not include an overlapping part with a previous symbol.

11. The user equipment of claim 10, wherein the symbol includes an orthogonal frequency division multiple access (OFDMA) symbol or a single carrier frequency division multiple access (SC-FDMA) symbol.

12. The user equipment of claim 10, wherein the timing adjustment command advances the transmission timing of the symbol by a certain step.

13. The user equipment of claim 10, wherein the length of the timing adjusted symbol is varied in consideration of a value of the timing adjustment command.

14. The user equipment of claim 10, wherein the length of the timing adjusted symbol is shorter than its original length.

15. The user equipment of claim 10, wherein a variance of the timing adjusted symbol in its length is the same as or longer than a length of the cyclic prefix.

16. The user equipment of claim 10, wherein a variance of the timing adjusted symbol in its length is shorter than a length of the cyclic prefix.

17. The user equipment of claim 10, wherein the cyclic prefix includes an unextended cyclic prefix or an extended cyclic prefix.

18. The user equipment of claim 10, wherein the timing adjustment command is applied from the first positioned symbol in a subframe.