METHOD FOR TRANSMITTING UPLINK SIGNAL WITH PERIODIC AND RELAY SYSTEM FOR THE SAME

• US 20120106432A1
• Filed: 01/28/2011
• Published: 05/03/2012
• Est. Priority Date: 10/29/2010
• Status: Abandoned Application

• Current Assignee: LG-Ericsson Company Limited (Telefonaktiebolaget LM Ericsson)
• Original Assignee: LG-Ericsson Company Limited (Telefonaktiebolaget LM Ericsson)
• Inventors: Kim, Young Jun, Kim, Sang Ha, Park, Byoung-Seong, Chang, Il Doo, Shin, Hong Sup, LEE, Hee Bong
• Application Number:
  US13/016,196
• Publication Number:
  US 20120106432A1
• Time in Patent Office: Days
• US Class Current: 370/315
• CPC Class Codes: H04B 7/15528 Control of operation parameters of a relay station to exploit the physical medium
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04W 56/004 compensating for timing error of reception due to propagation delay
• CPC Class Codes: H04W 84/047 using dedicated repeater stations

Abstract

In one embodiment, after determining downlink backhaul sub-frames based on a constitution period of backhaul sub-frames and determining uplink backhaul sub-frames based on the determined downlink backhaul sub-frames by a relay, all or portions of uplink signals in the determined uplink backhaul sub-frames are transmitted within a backhaul sub-frame allocation period, or after assigning numbers to all of the determined uplink backhaul sub-frames, all or portions of uplink signals are transmitted according to the assigned uplink backhaul sub-frame numbers within a backhaul sub-frame allocation period.

Claims

1. A backhaul timing control method, comprising:

a) transmitting, at a relay, a control signal to a user equipment during a control symbol period of a sub-frame; and

b) setting, at the relay, a data starting point of the sub-frame after a time (SG1) for switching from a transmission mode to a reception mode to receive backhaul data of a base station during backhaul symbol periods.

2. The method of claim 1, further comprising delaying, at the relay, timing of a transmission sub-frame and a reception sub-frame by the SG1.

3. The method of claim 2, further comprising transmitting, at the relay, the control signals to the user equipment during a control symbol period of a next sub-frame after a time for switching the reception mode to the transmission mode (SG2).

4. The method of claim 3, wherein a sum of lengths of the SG1 and SG2 is shorter than a length of a symbol (Ln) having a normal cyclic prefix (CP).

5. The method of claim 4, wherein the lengths of the SG1 and the SG2 are identical to each other and each length of the SG1 and the SG2 is longer than a length of the CP.

6. The method of claim 5, wherein the step b) includes receiving the backhaul data of the base station up to a last symbol period of backhaul symbols of the receiving sub-frame.

7. The method of claim 4, wherein the length of the SG2 is shorter than the length of the SG1 and each length of the SG1 and the SG2 is longer than a length of the CP.

8. The method of claim 1, further comprising delaying, at the relay, timing of a transmission sub-frame and a reception sub-frame by an amount resulting from subtracting the SG1 from a length of a symbol having a normal cyclic prefix (CP).

9. The method of claim 8, wherein the sum of the lengths of the SG1 and the SG2 is longer than the length of Ln.

10. The method of claim 9, wherein the lengths of the SG1 and the SG2 are identical to each other and each length of the SG1 and the SG2 is longer than the length of the CP.

11. The method of claim 10, wherein the step b) includes receiving, at the relay, backhaul data of the base station up to a symbol prior to a last symbol of the received sub-frame.

12. The method of claim 8, wherein a length of the SG2 is shorter than a length of the Ln and longer than a length of the CP.

13. A relay system, comprising:

a relay configured to transmit a control signal to a user equipment during a control symbol period of a sub-frame and set a data starting point of the sub-frame next to a time (SG1) for switching from a transmitting mode to a reception mode to receive backhaul data of a base station during backhaul symbol periods.

14. The relay system of claim 13, wherein timing of a transmission sub-frame and a reception sub-frame is delayed by the SG1.

15. The relay system of claim 14, wherein the control signals are transmitted to the user equipment during a control symbol period of a next sub-frame after a time (SG2) for switching from the reception mode to the transmission mode.

16. The relay system of claim 15, wherein a sum of lengths of the SG1 and SG2 is shorter than a length of a symbol (Ln) having a normal cyclic prefix (CP).

17. The relay system of claim 16, wherein the lengths of the SG1 and the SG2 are identical to each other and each length of the SG1 and the SG2 is longer than a length of the CP, and

wherein the relay system is configured to receive the backhaul data of the base station up to a last symbol period of a backhaul symbol of the received sub-frame.

18. The relay system of claim 13, wherein the relay system is configured to delay timing between a transmission sub-frame and a reception sub-frame by an amount resulting from subtracting the SG1 from a length of a symbol having a normal cyclic prefix (CP), and

wherein the sum of the lengths of the SG1 and the SG2 is longer than the length of LN.

19. The relay system of claim 18, wherein the lengths of the SG1 and the SG2 are identical to each other