Relay station and method of relay station transmitting backhaul uplink signal

• US 8,929,274 B2
• Filed: 08/12/2010
• Issued: 01/06/2015
• Est. Priority Date: 08/12/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Hak Seong, Seo, Han Byul, Kim, Ki Jun
• Primary Examiner(s): Kizou, Hassan
• Assistant Examiner(s): DAYA, TEJIS A
• Application Number:
  US13/390,029
• Publication Number:
  US 20120140703A1
• Time in Patent Office: 1,608 Days
• Field of Search: None
• US Class Current: 370/315
• CPC Class Codes: H04L 1/1692 Physical properties of the supervisory signal, e.g. acknowledgement by energy bursts
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 88/04 adapted for relaying to or from another terminal or user

Abstract

A method of a relay station transmitting a backhaul uplink (UL) signal includes receiving information about a structure of a subframe from a base station; allocating a reference signal and control information to the backhaul UL subframe on a basis of the information; and transmitting the reference signal and the control information. The reference signal or the control information is allocated to symbols other than a first symbol and last 2 symbols of the backhaul UL subframe.

Claims

1. A method of a relay station transmitting a backhaul uplink (UL) signal, the method comprising:

receiving information about a structure of a subframe from a base station,

wherein the received information indicates a first subframe structure or a second subframe structure;

allocating a demodulation reference signal (DM-RS), a relay-sounding reference signal (R-SRS) and control information to a backhaul UL subframe on a basis of the received information; and

transmitting the DM-RS, the R-SRS and the control information,

wherein the DM-RS and the control information are allocated to symbols other than a first symbol and last 2 symbols of the backhaul UL subframe,

wherein when the received information indicates the first subframe structure, the R-SRS is allocated to a second-to-last symbol of the backhaul UL subframe and a sounding reference signal (SRS) is allocated to a last symbol of the backhaul UL subframe, the SRS being a reference signal to be transmitted by a user equipment (UE), and

wherein when the received information indicates the second subframe structure, both the R-SRS and the SRS are allocated to a last symbol of the backhaul UL subframe, and the R-SRS and the SRS are mapped to different subcarriers.

2. The method of claim 1, wherein the DM-RS is a reference signal used for a demodulation of the control information and the R-SRS is a reference signal used for uplink scheduling.

3. The method of claim 1, wherein the R-SRS is mapped to an odd-numbered subcarrier and the SRS is mapped to an even-numbered subcarrier.

4. The method of claim 1, wherein:

the backhaul UL subframe includes two slots, and each of the slots includes a plurality of symbols.

5. The method of claim 4, wherein:

in a case in which each of the two slots includes 7 symbols and indices of the symbols are sequentially given 0 to 6, respectively, the DM-RS is allocated to a symbol having the symbol index of 2, 3, or 4 in each of the two slots, and the control information is allocated to a symbol having the symbol index of 1, 5, or 6 in the first slot and a symbol having the symbol index of 0 or 1 in the second slot, and

in a case in which each of the two slots includes 6 symbols and indices of the symbols are sequentially given 0 to 5, respectively, the DM-RS is allocated to a symbol having the symbol index of 2 or 3 in each of the two slots, and the control information is allocated to a symbol having the symbol index of 1, 4, or 5 in the first slot and a symbol having the symbol index of 0 or 1 in the second slot.

6. The method of claim 4, wherein:

in a case in which each of the two slots includes 7 symbols and indices of the symbols are sequentially given 0 to 6, respectively, the DM-RS is allocated to a symbol having the symbol index of 1 or 5 in the first slot and a symbol having the symbol index of 1 in the second slot, and the control information is allocated to a symbol having the symbol index of 2, 3, 4, or 6 in the first slot and a symbol having the symbol index of 0, 2, 3, or 4 in the second slot, and

in a case in which each of the two slots includes 6 symbols and indices of the symbols are sequentially given 0 to 5, respectively, the DM-RS is allocated to a symbol having the symbol index of 3 in each of the two slots, and the control information is allocated to a symbol having the symbol index of 1, 2, 4, or 5 in the first slot and a symbol having the symbol index of 0, 1, or 2 in the second slot.

7. The method of claim 4, wherein:

in a case in which each of the two slots includes 7 symbols and indices of the symbols are sequentially given 0 to 6, respectively, the DM-RS is allocated to a symbol having the symbol index of 2, 3, or 4 in the first slot and a symbol having the symbol index of 2 or 3 in the second slot, and the control information is allocated to a symbol having the symbol index of 1, 5, or 6 in the first slot and a symbol having the symbol index of 0, 1 or 4 in the second slot, and

in a case in which each of the two slots includes 6 symbols and indices of the symbols are sequentially given 0 to 5, respectively, the DM-RS is allocated to a symbol having the symbol index of 2 or 3 in the first slot and a symbol having the symbol index of 2 in the second slot, and the control information is allocated to a symbol having the symbol index of 1, 4, or 5 in the first slot and a symbol having the symbol index of 0, 1, or 3 in the second slot.

8. The method of claim 4, wherein:

in a case in which each of the two slots includes 7 symbols and indices of the symbols are sequentially given 0 to 6, respectively, the DM-RS is allocated to a symbol having the symbol index of 1 or 5 in the first slot and a symbol having the symbol index of 1 or 3 in the second slot, and the control information is allocated to a symbol having the symbol index of 2, 3, 4, or 6 in the first slot and a symbol having the symbol index of 0, 2, or 4 in the second slot, and

in a case in which each of the two slots includes 6 symbols and indices of the symbols are sequentially given 0 to 5, respectively, the DM-RS is allocated to a symbol having the symbol index of 3 in the first slot and a symbol having the symbol index of 2 in the second slot, and the control information is allocated to a symbol having the symbol index of 1, 2, 4, or 5 in the first slot and a symbol having the symbol index of 0, 1, or 3 in the second slot.

9. The method of claim 4, wherein:

in a case in which each of the two slots includes 7 symbols and indices of the symbols are sequentially given 0 to 6, respectively, the DM-RS is allocated to a symbol having the symbol index of 3 or 4 in the first slot and a symbol having the symbol index of 2 or 3 in the second slot, and the control information is allocated to a symbol having the symbol index of 1, 2, 5, or 6 in the first slot and a symbol having the symbol index of 0, 1, or 4 in the second slot, and

in a case in which each of the two slots includes 6 symbols and indices of the symbols are sequentially given 0 to 5, respectively, the DM-RS is allocated to a symbol having the symbol index of 2 or 3 in each of the slots, and the control information is allocated to a symbol having the symbol index of 1, 4, or 5 in the first slot and a symbol having the symbol index of 0 or 1 in the second slot.

10. The method of claim 4, wherein:

in a case in which each of the two slots includes 7 symbols and indices of the symbols are sequentially given 0 to 6, respectively, the DM-RS is allocated to a symbol having the symbol index of 2 or 5 in the first slot and a symbol having the symbol index of 1 or 4 in the second slot, and the control information is allocated to a symbol having the symbol index of 1, 3, 4, or 6 in the first slot and a symbol having the symbol index of 0, 2, or 3 in the second slot, and

in a case in which each of the two slots includes 6 symbols and indices of the symbols are sequentially given 0 to 5, respectively, the DM-RS is allocated to a symbol having the symbol index of 3 in the first slot and a symbol having the symbol index of 2 in the second slot, and the control information is allocated to a symbol having the symbol index of 1, 2, 4, or 5 in the first slot and a symbol having the symbol index of 0, 1, or 3 in the second slot.

11. A relay station, comprising:

a radio frequency (RF) unit configured to transmit and receive a radio signal; and

a processor connected to the RF unit,

wherein the processor is configured for;

receiving information about a structure of a subframe from a base station, wherein the received information indicates a first subframe structure or a second subframe structure;

allocating a demodulation reference signal (DM-RS), a relay-sounding reference signal (R-SRS) and control information to a backhaul UL subframe on a basis of the received information; and

transmitting the DM-RS, the R-SRS and the control information,

wherein the DM-RS and the control information are allocated to symbols other than a first symbol and last 2 symbols of the backhaul UL subframe,

wherein when the received information indicates the first subframe structure, the R-SRS is allocated to a second-to-last symbol of the backhaul UL subframe and a sounding reference signal (SRS) is allocated to a last symbol of the backhaul UL subframe, the SRS being a reference signal to be transmitted by a user equipment (UE), and

wherein when the received information indicates the second subframe structure, both the R-SRS and the SRS are allocated to a last symbol of the backhaul UL subframe and the R-SRS and the SRS are mapped to different subcarriers.

12. The relay station of claim 11, wherein the R-SRS is mapped to an odd-numbered subcarrier and the SRS is mapped to an even-numbered subcarrier.

13. The relay station of claim 11, wherein the DM-RS is a reference signal used for a demodulation of the control information and the R-SRS is a reference signal used for uplink scheduling.

14. The relay station of claim 11, wherein:

the backhaul UL subframe includes two slots, and each of the slots includes a plurality of symbols.

15. The relay station of claim 14, wherein:

in a case in which each of the two slots includes 7 symbols and indices of the symbols are sequentially given 0 to 6, respectively, the DM-RS is allocated to a symbol having the symbol index of 2, 3, or 4 in each of the two slots, and the control information is allocated to a symbol having the symbol index of 1, 5, or 6 in the first slot and a symbol having the symbol index of 0 or 1 in the second slot, and

in a case in which each of the two slots includes 6 symbols and indices of the symbols are sequentially given 0 to 5, respectively, the DM-RS is allocated to a symbol having the symbol index of 2 or 3 in each of the two slots, and the control information is allocated to a symbol having the symbol index of 1, 4, or 5 in the first slot and a symbol having the symbol index of 0 or 1 in the second slot.

16. The relay station of claim 14, wherein:

in a case in which each of the two slots includes 7 symbols and indices of the symbols are sequentially given 0 to 6, respectively, the DM-RS is allocated to a symbol having the symbol index of 1 or 5 in the first slot and a symbol having the symbol index of 1 in the second slot, and the control information is allocated to a symbol having the symbol index of 2, 3, 4, or 6 in the first slot and a symbol having the symbol index of 0, 2, 3, or 4 in the second slot, and

in a case in which each of the two slots includes 6 symbols and indices of the symbols are sequentially given 0 to 5, respectively, the DM-RS is allocated to a symbol having the symbol index of 3 in each of the two slots, and the control information is allocated to a symbol having the symbol index of 1, 2, 4, or 5 in the first slot and a symbol having the symbol index of 0, 1, or 2 in the second slot.

17. The relay station of claim 14, wherein:

in a case in which each of the two slots includes 7 symbols and indices of the symbols are sequentially given 0 to 6, respectively, the DM-RS is allocated to a symbol having the symbol index of 2, 3, or 4 in the first slot and a symbol having the symbol index of 2 or 3 in the second slot, and the control information is allocated to a symbol having the symbol index of 1, 5, or 6 in the first slot and a symbol having the symbol index of 0, 1 or 4 in the second slot, and

in a case in which each of the two slots includes 6 symbols and indices of the symbols are sequentially given 0 to 5, respectively, the DM-RS is allocated to a symbol having the symbol index of 2 or 3 in the first slot and a symbol having the symbol index of 2 in the second slot, and the control information is allocated to a symbol having the symbol index of 1, 4, or 5 in the first slot and a symbol having the symbol index of 0, 1, or 3 in the second slot.

18. The relay station of claim 14, wherein:

in a case in which each of the two slots includes 7 symbols and indices of the symbols are sequentially given 0 to 6, respectively, the DM-RS is allocated to a symbol having the symbol index of 1 or 5 in the first slot and a symbol having the symbol index of 1 or 3 in the second slot, and the control information is allocated to a symbol having the symbol index of 2, 3, 4, or 6 in the first slot and a symbol having the symbol index of 0, 2, or 4 in the second slot, and

in a case in which each of the two slots includes 6 symbols and indices of the symbols are sequentially given 0 to 5, respectively, the DM-RS is allocated to a symbol having the symbol index of 3 in the first slot and a symbol having the symbol index of 2 in the second slot, and the control information is allocated to a symbol having the symbol index of 1, 2, 4, or 5 in the first slot and a symbol having the symbol index of 0, 1, or 3 in the second slot.

19. The relay station of claim 14, wherein:

in a case in which each of the two slots includes 7 symbols and indices of the symbols are sequentially given 0 to 6, respectively, the DM-RS is allocated to a symbol having the symbol index of 3 or 4 in the first slot and a symbol having the symbol index of 2 or 3 in the second slot, and the control information is allocated to a symbol having the symbol index of 1, 2, 5, or 6 in the first slot and a symbol having the symbol index of 0, 1, or 4 in the second slot, and

in a case in which each of the two slots includes 6 symbols and indices of the symbols are sequentially given 0 to 5, respectively, the DM-RS is allocated to a symbol having the symbol index of 2 or 3 in each of the slots, and the control information is allocated to a symbol having the symbol index of 1, 4, or 5 in the first slot and a symbol having the symbol index of 0 or 1 in the second slot.

20. The relay station of claim 14, wherein:

in a case in which each of the two slots includes 7 symbols and indices of the symbols are sequentially given 0 to 6, respectively, the DM-RS is allocated to a symbol having the symbol index of 2 or 5 in the first slot and a symbol having the symbol index of 1 or 4 in the second slot, and the control information is allocated to a symbol having the symbol index of 1, 3, 4, or 6 in the first slot and a symbol having the symbol index of 0, 2, or 3 in the second slot, and

in a case in which each of the two slots includes 6 symbols and indices of the symbols are sequentially given 0 to 5, respectively, the DM-RS is allocated to a symbol having the symbol index of 3 in the first slot and a symbol having the symbol index of 2 in the second slot, and the control information is allocated to a symbol having the symbol index of 1, 2, 4, or 5 in the first slot and a symbol having the symbol index of 0, 1, or 3 in the second slot.