Method and apparatus for use in cooperative relays using incremental redundancy and distributed spatial multiplexing

• US 9,077,424 B2
• Filed: 07/16/2014
• Issued: 07/07/2015
• Est. Priority Date: 07/07/2008
• Status: Expired due to Fees

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Inventors: Pinheiro, Ana Lucia, Sfar, Sana, Chitrapu, Prabakar R., Pietraski, Philip J., Zeira, Eldad M., Beluri, Mihaela C., Reznik, Alexander
• Primary Examiner(s): Hsu, Alpus H
• Assistant Examiner(s): LAM, YEE F
• Application Number:
  US14/333,098
• Publication Number:
  US 20140328244A1
• Time in Patent Office: 356 Days
• US Class Current: 1/1
• CPC Class Codes: H04B 1/38 Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
• CPC Class Codes: H04B 7/026 Co-operative diversity, e.g. using fixed or mobile stations as relays
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• CPC Class Codes: H04B 7/15 Active relay systems
• CPC Class Codes: H04L 1/0618 Space-time coding
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 1/1816 with retransmission of the same, encoded, message
• CPC Class Codes: H04L 1/1819 with retransmission of additional or different redundancy
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 2001/0097 Relays

Abstract

A method and apparatus may be used in cooperative relays with incremental redundancy (IR) and distributed spatial multiplexing. A wireless transmit/receive unit (WTRU) may listen to the base station (BS) transmission during a first phase of the communication, and use cooperation between a relay station (RS) and the BS for the data transmission during a second phase to improve performance. During the second phase, both the BS and the RS may transmit data to the WTRU, using either distributed Space Time Block Codes/Space Frequency Block Codes (STBC/SFBC) or distributed spatial multiplexing.

Claims

1. A relay station (RS) comprising:

a receiver configured to receive a first phase transmission from a base station (BS); and

a transmitter configured to transmit a second phase transmission over an RS link, wherein the second phase transmission contains a subset of bits received in the first phase transmission and contains a plurality of bits coded with different redundancy versions (RVs),

wherein the RS link is allocated a greater proportion of the plurality of bits on a condition that a link quality of the RS link is stronger than a link quality of a BS link,

wherein the BS link is allocated a greater proportion of the plurality of bits on a condition that the link quality of the BS link is stronger than the link quality of the RS link; and

wherein the transmitter is further configured to transmit a channel quality index (CQI) feedback to the BS.

2. The RS of claim 1, wherein the transmitter is configured to transmit the second phase transmission to a wireless transmit/receive unit (WTRU).

3. The RS of claim 1, wherein the receiver is configured to receive the first phase transmission coded with a first redundancy version (RV) and wherein the transmitter is configured to transmit the second phase transmission coded with a second and third RV.

4. The RS of claim 1 wherein the transmitter is further configured to transmit the CQI feedback based on a channel quality between the BS and the RS.

5. The RS of claim 1, wherein the transmitter is further configured to transmit the second phase transmission containing a bit coded with a subset of information from the first phase transmission.

6. The RS of claim 1, wherein the transmitter is configured to transmit the second phase transmission partitioned into systematic bits and a plurality of parity bits.

7. The RS of claim 6, wherein the transmitter is configured to transmit the plurality of parity bits that are assigned a higher priority based on a RV.

8. The RS of claim 6, wherein the transmitter is configured to transmit the systematic bits that are assigned a higher priority based on a RV.

9. A wireless communications method for a relay station (RS), the method comprising:

receiving a first phase transmission from a base station (BS); and

transmitting a second phase transmission over an RS link, wherein the second phase transmission contains a subset of bits received in the first phase transmission and contains a plurality of bits coded with different redundancy versions (RVs),

wherein the RS link is allocated a greater proportion of the plurality of bits on a condition that a link quality of the RS link is stronger than a link quality of a BS link,

wherein the BS link is allocated a greater proportion of the plurality of bits on a condition that the link quality of the BS link is stronger than the link quality of the RS link; and

transmitting a channel quality index (CQI) feedback to the BS.

10. The method of claim 9, wherein the first phase transmission is received from the BS.

11. The method of claim 10, wherein the first phase transmission is coded with a first redundancy version (RV) and wherein a plurality of bits in the second phase transmission are coded with a second and third RV.

12. The method of claim 11, wherein the first RV is equal to the second RV.

13. The method of claim 11, wherein the second RV is equal to the third RV with distributed space time block coding (STBC) or space frequency block coding (SFBC) modulation.

14. The method of claim 9 wherein the CQI feedback is transmitted based on a channel quality between the RS and the BS.

15. The method of claim 9, wherein the plurality of bits transmitted in the second phase transmission are partitioned into systematic bits and a plurality of parity bits.

16. The method of claim 15, wherein the plurality of parity bits is assigned a higher priority based on a RV.

17. The method of claim 15, wherein the systematic bits are assigned a higher priority based on a RV.

18. The method of claim 9, wherein the second phase transmission contains a bit coded with a subset of information from the first phase transmission.