Signaling of power information for MIMO transmission in a wireless communication system

1. An apparatus for wireless communication, the apparatus comprising:

a processor; and

a memory coupled to the processor, wherein the memory stores instructions executable by the processor to perform operations comprising:

determining power information indicative of total power of a designated number of channelization codes;

sending the power information to user equipment (UE);

receiving channel quality indicator (CQI) indices from the UE; and

determining a preferred number of transport blocks associated with the UE based on the number of received CQI indices.

2. The apparatus of claim 1 , wherein the operations further comprise sending one or more transport blocks to the UE via a multiple-input multiple-output (MIMO) transmission.

3. The apparatus of claim 1 , wherein the operations further comprise sending fewer than the preferred number of transport blocks to the UE.

4. The apparatus of claim 1 , wherein the total power for the designated number of channelization codes is distributed evenly among the preferred number of transport blocks.

5. The apparatus of claim 1 , wherein each of the designated number of channelization codes has equal power per channelization code.

6. The apparatus of claim 5 , wherein the power information includes a power offset value between a total power for the designated number of channelization codes for a data channel and power of a pilot channel, wherein the power offset value is expressed in decibels.

7. The apparatus of claim 1 , wherein each of the designated number of channelization codes is an orthogonal variable spreading factor (OVSF) code.

8. The apparatus of claim 1 , wherein the operations further comprise sending the power information to the UE via a Radio Resource Control (RRC) message.

9. The apparatus of claim 1 , wherein the preferred number of transport blocks is one or two.

10. A method for wireless communication, the method comprising:

determining power information indicative of total power for a designated number of channelization codes;

sending the power information to user equipment (UE);

receiving channel quality indicator (CQI) indices from the UE; and

determining a preferred number of transport blocks associated with the UE based on the number of received CQI indices.

11. The method of claim 10 , further comprising sending one or more transport blocks to the UE via a multiple-input multiple-output (MIMO) transmission, wherein each of the designated number of channelization codes has equal power per channelization code.

12. The method of claim 10 , further comprising sending fewer than the preferred number of transport blocks to the UE, and wherein the designated number of channelization codes do not have equal power channelization code.

13. The method of claim 10 , wherein the power information includes a power offset value between a total power for the designated number of channelization codes for a data channel and power of a pilot channel, wherein the power offset value is expressed in decibels.

14. The method of claim 10 , wherein determining the power information comprises scaling a power offset value based on a number of available channelization codes and the designated number of channelization codes.

15. The method of claim 10 , wherein the total power is distributed equally among the designated number of channelization codes.

16. The method of claim 10 , wherein the total power is distributed unequally among the designated number of channelization codes.

17. An apparatus for wireless communication, the apparatus comprising:

means for determining power information indicative of total power for a designated number of channelization codes;

means for sending the power information to user equipment (UE);

means for receiving channel quality indicator (CQI) indices from the UE; and

means for determining a preferred number of transport blocks associated with the UE based on the number of received CQI indices.

18. The apparatus of claim 17 , further comprising means for sending one or more transport blocks to the UE via a multiple-input multiple-output (MIMO) transmission.

19. The apparatus of claim 17 , wherein each of the designated number of channelization codes has equal power per channelization code.

20. A non-transitory computer readable storage device including instructions executable by a processor to perform operations comprising:

determining power information indicative of total power for a designated number of channelization codes;

sending the power information to user equipment (UE);

receiving channel quality indicator (CQI) indices from the UE; and

determining a preferred number of transport blocks associated with the UE based on the number of received CQI indices.

21. The non-transitory computer readable storage device of claim 20 , wherein the operations further comprise sending one or more transport blocks to the UE via a multiple-input multiple-output (MIMO) transmission.

22. The non-transitory computer readable storage device of claim 20 , wherein the operations further comprise sending fewer than the preferred number of transport blocks to the UE.

23. The non-transitory computer readable storage device of claim 20 , wherein each of the designated number of channelization codes has equal power per channelization code.

24. An apparatus for wireless communication, the apparatus comprising:

a processor; and

a memory coupled to the processor, wherein the memory stores instructions executable by the processor to perform operations comprising:

receiving power information from a Node B indicative of total power for a designated number of channelization codes;

determining channel quality indicator (CQI) indices based on the received power information; and

sending the CQI indices to the Node B, wherein a number of the CQI indices indicates a preferred number of transport blocks to the Node B.

25. The apparatus of claim 24 , wherein the operations further comprise receiving one or more transport blocks from the Node B via a multiple-input multiple-output (MIMO) transmission.

26. The apparatus of claim 24 , wherein the operations further comprise receiving fewer than the preferred number of transport blocks from the Node B.

27. The apparatus of claim 24 , wherein the operations further comprise determining at least one CQI index for at least one transport block based on power per channelization code determined based on the received power information.

28. The apparatus of claim 27 , wherein the operations further comprise determining the at least one CQI index based on an even distribution of received total power of the designated number of channelization codes among the preferred number of transport blocks.

29. The apparatus of claim 24 , wherein the operations further comprise determining received total power based on a power offset value received from the Node B and power of a pilot channel, wherein the power information includes the power offset value, and wherein the power offset value is expressed in units of a decibel.

30. The apparatus of claim 24 , wherein each of the designated number of channelization codes is an orthogonal variable spreading factor (OVSF) code.

31. The apparatus of claim 24 , wherein the operations further comprise receiving the power information from the Node B via a Radio Resource Control (RRC) message.

32. The apparatus of claim 24 , wherein the preferred number of transport blocks is one or two.

33. The apparatus of claim 24 , wherein the CQI indices include two CQI indices to indicate that the preferred number of transport blocks is two.

34. A method for wireless communication, the method comprising:

receiving power information from a Node B indicative of total power for a designated number of channelization codes;

determining channel quality indicator (CQI) indices based on the received power information; and

sending the CQI indices to the Node B, wherein a number of the CQI indices indicates a preferred number of transport blocks to the Node B.

35. The method of claim 34 , further comprising determining received total power based on a power offset value received from the Node B and power of a pilot channel, wherein the power information includes the power offset value, and wherein the power offset value is expressed in units of a decibel.

36. The method of claim 34 , wherein each of the designated number of channelization codes is an orthogonal variable spreading factor (OVSF) code.

37. The method of claim 34 , wherein the power information is associated with a power offset value that is scaled based on a number of available channelization codes and the designated number of channelization codes.

38. An apparatus for wireless communication, the apparatus comprising:

means for receiving power information from a Node B indicative of total power for a designated number of channelization codes;

means for determining channel quality indicator (CQI) indices based on the received power information; and

means for sending the CQI indices to the Node B, wherein a number of the CQI indices indicates a preferred number of transport blocks to the Node B.

39. The apparatus of claim 38 , further comprising means for receiving one or more transport blocks from the Node B via a multiple-input multiple-output (MIMO) transmission.

40. The apparatus of claim 38 , further comprising means for receiving fewer than the preferred number of transport blocks from the Node B.

41. A non-transitory computer readable storage device including instructions executable by a processor to perform operations comprising:

receiving power information from a Node B indicative of total power for a designated number of channelization codes;

determining channel quality indicator (CQI) indices based on the received power information; and

sending the CQI indices to the Node B, wherein a number of the CQI indices indicates a preferred number of transport blocks to the Node B.

42. The non-transitory computer readable storage device of claim 41 , wherein the operations further comprise receiving one or more transport blocks from the Node B via a multiple-input multiple-output (MIMO) transmission.