Rank and PMI in download control signaling for uplink single-user MIMO (UL SU-MIMO)

Patent metadata

Field	Value
Publication number	US-9264117-B2
Application number	US-201414452090-A
Country	US
Kind code	B2
Filing date	Aug 5, 2014
Priority date	Apr 22, 2008
Publication date	Feb 16, 2016
Grant date	Feb 16, 2016

Abstract

A method of operating a user equipment device includes extracting at least one rank indicator (RI) from an uplink grant, and adapting a transmission rank in response to said RI. At least two transmit antennas are configured to transmit according to said transmission rank.

First claim

What is claimed is:

1. A user equipment device, comprising:
circuitry for extracting at least one indication of rank from an uplink grant;
circuitry for adapting a transmission rank in response to said indication of rank;
circuitry for configuring at least two transmit antennas to transmit according to said transmission rank; and
circuitry for extracting at least two pre-coding matrix indicators (PMI) from said uplink grant, wherein a first PMI is associated with a set of P sub-bands allocated by said grant, and a second PMI is associated with at least one sub-band of said set of P allocated sub-bands.

2. The device of claim 1 , further comprising circuitry for extracting at least one pre-coding matrix indicator (PMI) from said uplink grant.

3. The device of claim 1 , wherein said indication of rank is jointly coded with said PMI.

4. The device of claim 2 , wherein said at least one PMI is a single wideband PMI.

5. The device of claim 1 , wherein said second PMI is associated with a selected subset of said set of P allocated sub-bands.

6. The device of claim 5 , wherein said selected subset has a higher signal-to-interference plus noise ratio than a remaining subset of said sub-bands.

7. The device of claim 5 , wherein said uplink grant includes a position indicator representing a position of said selected subset within said set of P allocated sub-bands.

8. The device of claim 1 , wherein said second PMI is encoded differentially with respect to said first PMI.

9. The device of claim 8 , wherein said second PMI is encoded using fewer bits than said first PMI.

10. A base station having at least two receive antennas, comprising:
circuitry for receiving a reference signal;
circuitry for generating at least one indication of rank in response to said receiving;
circuitry for transmitting an uplink grant including said indication of rank; and
circuitry for generating at least two pre-coding matrix indicators (PMI) and including said PMIs in said uplink grant, wherein a first PMI is associated with a set of P sub-bands allocated by said grant, and a second PMI is associated with at least one sub-band of said set of P allocated sub-bands.

11. The base station of claim 10 , further comprising circuitry for generating at least one pre-coding matrix indicator (PMI) and including said PMI in said uplink grant.

12. The base station of claim 11 , further comprising jointly encoding said indication of rank and PMI.

13. The base station of claim 11 , wherein said at least one PMI is a single wideband PMI.

14. The base station of claim 11 , wherein said second PMI is associated with a selected subset of said set of P allocated sub-bands.

15. The base station of claim 14 , wherein said selected subset has a higher signal-to-interference plus noise ratio than a remaining subset of said sub-bands.

16. The base station of claim 14 , wherein said uplink grant includes a position indicator representing a position of said selected subset within said set of P allocated sub-bands.

17. The base station of claim 11 , wherein said second PMI is encoded differentially with respect to said first PMI.

18. The base station of claim 17 , wherein said second PMI is encoded using fewer bits than said first PMI.

Assignees

• Texas Instruments Inc

Inventors

• Chen Runhua
• Onggosanusi Eko N

Classifications

• H04W72/563

  of the wireless resources · CPC title

• H04B7/0456 Primary

  Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting · CPC title

• H04L5/0053 Primary

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title

• H04L1/0031

  Multiple signaling transmission (H04L1/1664, F15 take precedence) · CPC title

• H04L2025/03426

  transmission using multiple-input and multiple-output channels · CPC title