System and method for uplink multiple input multiple output transmission

• US 9,380,490 B2
• Filed: 03/15/2013
• Issued: 06/28/2016
• Est. Priority Date: 11/08/2010
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Akkarakaran, Sony J, Sambhwani, Sharad Deepak, Bharadwaj, Arjun
• Primary Examiner(s): Nguyen, Phuongchau Ba
• Application Number:
  US13/843,451
• Publication Number:
  US 20130229906A1
• Time in Patent Office: 1,201 Days
• Field of Search: 370/329, 370/216, 370/252, 370/311, 75/E10.02, 375/141, 375/260, 375/299
• US Class Current: 1/1
• CPC Class Codes: H04B 7/0404 the mobile station comprising multiple antennas, e.g. to provide uplink diversity
• CPC Class Codes: H04B 7/0465 taking power constraints at power amplifier or emission constraints, e.g. constant modulus, into account
• CPC Class Codes: H04B 7/0689 using different transmission schemes, at least one of them being a diversity transmission scheme
• CPC Class Codes: H04L 1/0001 Systems modifying transmission characteristics according to link quality, e.g. power backoff adaptive data allocation for multicarrier modulation H04L5/0044; controlling transmission power for radio systems H04W52/04
• CPC Class Codes: H04L 1/1812 Hybrid protocols; Hybrid automatic repeat request [HARQ]
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 52/48 during retransmission after error or non-acknowledgment
• CPC Class Codes: H04W 72/12 Wireless traffic scheduling

Abstract

Methods and apparatuses are provided for uplink MIMO transmissions in a wireless communication system. In some particular aspects, scheduling of the uplink MIMO transmissions may make a determination between single stream, rank=1 transmissions and dual stream, rank=2 transmissions based on various factors. Further, when switching between single and dual stream transmissions in the presence of HARQ retransmissions of failed packets, the scheduling function may determine to transmit the HARQ retransmissions on a single stream transmission or to transmit the HARQ retransmissions on one stream while transmitting new packets on the other stream.

Claims

1. A method of wireless communication, comprising:

transmitting a MIMO uplink utilizing a first stream and a second stream in a dual stream mode;

receiving HARQ feedback indicating a decoding failure of a packet on the second stream and a decoding success of a packet on the first stream;

receiving a command to switch from the dual stream mode to a single stream mode;

determining to only transmit the first stream in response to the command;

allocating at least some portion of power from the second stream to the first stream when a determination is made to only transmit the first stream; and

transmitting, on the first stream, a HARQ retransmission corresponding to the decoding failure of the packet on the second stream.

2. The method of claim 1, wherein the first stream comprises a primary stream and the second stream comprises a secondary stream.

3. The method of claim 1, wherein

allocating the at least some portion of power from the second stream to the first stream is according to a power scaling, and

the power scaling is based on at least one of

a traffic-to-pilot (T2P) power ratio of at least one of the first stream and the second stream,

a transport block size (TBS) of at least one of the first stream and the second stream, or

a user equipment power headroom limitation.

4. A method of wireless communication, comprising:

transmitting a MIMO uplink utilizing a first stream and a second stream in a dual stream mode;

receiving HARQ feedback indicating a decoding failure of a packet on the first stream and a decoding success of a packet on the second stream;

receiving a command to switch from the dual stream mode to a single stream mode;

determining to only transmit the first stream in response to the command;

allocating at least some portion of power from the second stream to the first stream when a determination is made to only transmit the first stream; and

transmitting, on the first stream, a HARQ retransmission corresponding to the decoding failure of the packet on the first stream.

5. The method of claim 4, wherein the first stream comprises a primary stream and the second stream comprises a secondary stream.

6. The method of claim 4, further comprising:

allocating at least some portion of power from the second stream to the first stream.

7. The method of claim 6, wherein

allocating the at least some portion of power from the second stream to the first stream is according to a power scaling, and

the power scaling is based on at least one of

a traffic-to-pilot (T2P) power ratio of at least one of the first stream and the second stream,

a transport block size (TBS) of at least one of the first stream and the second stream, or

a user equipment power headroom limitation.

8. A method of wireless communication, comprising:

transmitting a MIMO uplink utilizing a first stream and a second stream;

receiving HARQ feedback indicating a decoding failure of a packet on the second stream and a decoding success of a packet on the first stream;

receiving one of a first command to transmit a single stream or a second command to transmit dual streams;

determining to transmit the first stream in response to the first command;

allocating at least some portion of power from the second stream to the first stream when a determination is made to transmit the first stream; and

transmitting, on the first stream, a HARQ retransmission corresponding to the decoding failure of the packet on the second stream.

9. The method of claim 8, wherein the first stream comprises a primary stream and the second stream comprises a secondary stream.

10. The method of claim 8, wherein

allocating, upon reception of the first command, the at least some portion of power from the second stream to the first stream is according to a power scaling, and

the power scaling is based on at least one of

a traffic-to-pilot (T2P) power ratio of at least one of the first stream and the second stream,

a transport block size (TBS) of at least one of the first stream and the second stream, or a user equipment power headroom limitation.

11. The method of claim 8, further comprising:

selecting, upon reception of the second command, a next packet for transmission on the first stream; and

determining one or more of

whether a transport block size (TBS) of the next packet is greater than a pre-determined block size, or

whether an available power for the first stream is greater than a pre-determined power value.

12. The method of claim 11, further comprising:

transmitting a new packet on the first stream and the HARQ retransmission corresponding to the decoding failure of the packet on the second stream, on the second stream when

the TBS of the next packet is greater than the pre-determined block size and the available power for the first stream is greater than the pre-determined power value,

the TBS of the next packet is equal to or less than the pre-determined block size and a corresponding TBS constraint can be violated, or

the available power for the first stream is equal to or less than the pre-determined power value and a corresponding power constraint can be violated.

13. The method of claim 11, further comprising:

transmitting the HARQ retransmission corresponding to the decoding failure of the packet on the second stream, on the first stream, when

the TBS of the next packet is equal to or less than the pre-determined block size and a corresponding TBS constraint is followed, or

the available power for the first stream is equal to or less than the pre-determined power value and a corresponding power constraint is followed.

14. A method of wireless communication, comprising:

transmitting a MIMO uplink utilizing a first stream and a second stream;

receiving HARQ feedback indicating a decoding failure of a packet on the first stream and a decoding success of a packet on the second stream;

receiving one of a first command to transmit a single stream or a second command to transmit dual streams;

determining to transmit the first stream in response to the first command;

allocating at least some portion of power from the second stream to the first stream when a determination is made to transmit the first stream; and

transmitting, on the first stream, a HARQ retransmission corresponding to the decoding failure of the packet on the first stream.

15. The method of claim 14, wherein the first stream comprises a primary stream and the second stream comprises a secondary stream.

16. The method of claim 15, further comprising:

allocating, upon reception of the first command, at least some portion of power from the second stream to the first stream.

17. The method of claim 16, wherein

allocating, upon reception of the first command, the at least some portion of power from the second stream to the first stream is according to a power scaling, and

the power scaling is based on at least one of

a traffic-to-pilot (T2P) power ratio of at least one of the first stream and the second stream,

a transport block size (TBS) of at least one of the first stream and the second stream, or

a user equipment power headroom limitation.

18. The method of claim 14, further comprising:

selecting, upon reception of the second command, a next packet for transmission on the second stream; and

determining one or more of

whether a transport block size (TBS) of the next packet is greater than a pre-determined block size, or

whether an available power for the first stream is greater than a pre-determined power value.

19. The method of claim 18, further comprising:

transmitting a new packet on the second stream and the HARQ retransmission corresponding to the decoding failure of the packet on the first stream, on the first stream when

the TBS of the next packet is greater than the pre-determined block size and the available power for the second stream is greater than the pre-determined power value,

the TBS of the next packet is equal to or less than the pre-determined block size and a corresponding TBS constraint can be violated, or

the available power for the second stream is equal to or less than the pre-determined power value and a corresponding power constraint can be violated.

20. The method of claim 18, further comprising:

transmitting the HARQ retransmission corresponding to the decoding failure of the packet on the first stream, on the first stream, when

the TBS of the next packet is equal to or less than the pre-determined block size and a corresponding TBS constraint is followed, or

the available power for the second stream is equal to or less than the pre-determined power value and a corresponding power constraint is followed.

21. A non-transitory computer-readable medium storing executable code for wireless communication, comprising:

code for transmitting a MIMO uplink utilizing a first stream and a second stream;

code for receiving HARQ feedback indicating a decoding failure of a packet on the first stream and a decoding success of a packet on the second stream;

code for receiving one of a first command to transmit a single stream or a second command to transmit dual streams;

code for determining to transmit the first stream in response to the first command;

code for allocating at least some portion of power from the second stream to the first stream when a determination is made to transmit the first stream; and

code for transmitting on the first stream, a HARQ retransmission corresponding to the decoding failure of the packet on the first stream.

22. An apparatus for wireless communication, comprising:

means for transmitting a MIMO uplink utilizing a first stream and a second stream;

means for receiving HARQ feedback indicating a decoding failure of a packet on the first stream and a decoding success of a packet on the second stream;

means for receiving one of a first command to transmit a single stream or a second command to transmit dual streams;

means for determining to transmit the first stream in response to the first command;

means for allocating at least some portion of power from the second stream to the first stream when a determination is made to transmit the first stream; and

means for transmitting, on the first stream, a HARQ retransmission corresponding to the decoding failure of the packet on the first stream.

23. A wireless user equipment, comprising:

a transmitter for transmitting a primary virtual antenna and a secondary virtual antenna;

at least one processor for controlling the transmitter; and

a memory coupled to the at least one processor,

wherein the at least one processor is configured to;

transmit a MIMO uplink utilizing a first stream and a second stream;

receive HARQ feedback indicating a decoding failure of a packet on the first stream and a decoding success of a packet on the second stream;

receive one of a first command to transmit a single stream or a second command to transmit dual streams;

determine to transmit the first stream in response to the first command;

allocate at least some portion of power from the second stream to the first stream when a determination is made to transmit the first stream; and

transmit, on the first stream, a HARQ retransmission corresponding to the decoding failure of the packet on the first stream.

24. The wireless user equipment of claim 23, wherein the first stream comprises a primary stream and the second stream comprises a secondary stream.

25. The wireless user equipment of claim 23, wherein the at least one processor is further configured to:

allocate, upon reception of the first command, at least some portion of power from the second stream to the first stream.

26. The wireless user equipment of claim 25, wherein

allocating, upon reception of the first command, the at least some portion of power from the second stream to the first stream is according to a power scaling, and

the power scaling is based on at least one of

a traffic-to-pilot (T2P) power ratio of at least one of the first stream and the second stream,

a transport block size (TBS) of at least one of the first stream and the second stream, or

a user equipment power headroom limitation.

27. The wireless user equipment of claim 23, wherein the at least one processor is further configured to:

select, upon reception of the second command, a next packet for transmission on the second stream; and

determine one or more of

whether a transport block size (TBS) of the next packet is greater than a pre-determined block size, or

whether an available power for the first stream is greater than a pre-determined power value.

28. The wireless user equipment of claim 27, wherein the at least one processor is further configured to:

transmit a new packet on the second stream and the HARQ retransmission corresponding to the decoding failure of the packet on the first stream, on the first stream when

the TBS of the next packet is greater than the pre-determined block size and the available power for the second stream is greater than the pre-determined power value,

the TBS of the next packet is equal to or less than the pre-determined block size and a corresponding TBS constraint can be violated, or

the available power for the second stream is equal to or less than the pre-determined power value and a corresponding power constraint can be violated.

29. The wireless user equipment of claim 27, wherein the at least one processor is further configured to:

transmit the HARQ retransmission corresponding to the decoding failure of the packet on the first stream, on the first stream, when

the TBS of the next packet is equal to or less than the pre-determined block size and a corresponding TBS constraint is followed, or

the available power for the second stream is equal to or less than the pre-determined power value and a corresponding power constraint is followed.