METHOD AND APPARATUS FOR SENDING DATA AND CONTROL INFORMATION IN A WIRELESS COMMUNICATION SYSTEM

• US 20130142149A1
• Filed: 01/08/2013
• Published: 06/06/2013
• Est. Priority Date: 07/07/2006
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Malladi, Durga Prasad
• Granted Patent: US 9,485,761 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 1/0004 applied to control information
• CPC Class Codes: H04L 1/001 applied to control information
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0073 Special arrangements for feedback channel
• CPC Class Codes: H04L 1/1671 the supervisory signal being transmitted together with control information
• CPC Class Codes: H04L 1/1887 Scheduling and prioritising arrangements
• CPC Class Codes: H04L 27/0008 arrangements for allowing a transmitter or receiver to use more than one type of modulation negotiating modulation type for two-way transmission paths H04L5/1453
• CPC Class Codes: H04L 27/2613 Structure of the reference signals
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

Techniques for sending control information in a communication system are described. In an aspect, control information may be sent in a first frequency location (e.g., a first set of subcarriers) if data is not being sent and in a second frequency location (e.g., a second set of subcarriers) if data is being sent. In another aspect, control information may be processed in accordance with a first processing scheme if data is not being sent and with a second processing scheme if data is being sent. In one design of the first scheme, a CAZAC sequence may be modulated with each modulation symbol for control information to obtain a corresponding modulated CAZAC sequence, which may be sent on the first set of subcarriers. In one design of the second scheme, modulation symbols for control information may be combined with modulation symbols for data, transformed to frequency domain, and mapped to the second set of subcarriers.

Claims

1. A method for wireless communication, comprising:

processing control information in accordance with a first processing scheme if data is not being sent; and

processing the control information in accordance with a second processing scheme if data is being sent.

2. The method of claim 1, wherein the processing the control information in accordance with the first processing scheme comprises

processing the control information to obtain at least one modulation symbol,

modulating a sequence with each of the at least one modulation symbol to obtain a corresponding modulated sequence, and

mapping each modulated sequence to a set of subcarriers.

3. The method of claim 2, wherein the sequence comprises a Zadoff-Chu sequence or a Chu sequence of length M, where M is the number of subcarriers in the set of subcarriers.

4. The method of claim 2, wherein the sequence comprises a CAZAC (constant amplitude zero auto-correlation) sequence or a pseudo-CAZAC sequence having a small non-zero autocorrelation and small variations in amplitude.

5. The method of claim 1, wherein the processing the control information in accordance with the second processing scheme comprises

processing the control information to obtain at least one modulation symbol,

combining the at least one modulation symbol for the control information with modulation symbols for data to obtain combined modulation symbols, and

mapping the combined modulation symbols to a set of subcarriers.

6. The method of claim 5, wherein the combining the at least one modulation symbol for the control information comprises

multiplexing the at least one modulation symbol for the control information with the modulation symbols for data to obtain the combined modulation symbols.

7. The method of claim 5, wherein the combining the at least one modulation symbol for the control information comprises

puncturing and replacing at least one of the modulation symbols for data with the at least one modulation symbol for the control information to obtain the combined modulation symbols.

8. The method of claim 5, wherein the processing the control information in accordance with the second processing scheme further comprises

transforming the combined modulation symbols from time domain to frequency domain to obtain frequency-domain symbols, and mapping the frequency-domain symbols to the set of subcarriers.

9. The method of claim 1, further comprising:

obtaining frequency-domain symbols for the control information if data is not being sent;

obtaining frequency-domain symbols for the control information and data if data is being sent; and

generating at least one single-carrier frequency division multiplexing (SC-FDM) symbol based on the frequency-domain symbols.

10. The method of claim 1, wherein the control information comprises acknowledgement (ACK) information.

11. The method of claim 10, wherein the processing the control information in accordance with the first processing scheme comprises

mapping the ACK information to a modulation symbol,

modulating a sequence with the modulation symbol to obtain a modulated sequence, and

mapping the modulated sequence to a set of subcarriers.

12. The method of claim 10, wherein the processing the control information in accordance with the second processing scheme comprises

mapping the ACK information to a modulation symbol,

repeating the modulation symbol multiple times to obtain repeated modulation symbols, and

combining the repeated modulation symbols with modulation symbols for data.

13. The method of claim 10, wherein the processing the control information in accordance with the second processing scheme comprises

mapping the ACK information to a modulation symbol,

spreading the modulation symbol with an orthogonal sequence to obtain spread modulation symbols, and

combining the spread modulation symbols with modulation symbols for data.

14. The method of claim 1, further comprising:

generating at least one modulation symbol for the control information based on a first modulation scheme if data is not being sent; and

generating the at least one modulation symbol for the control information based on a second modulation scheme if data is being sent.

15. The method of claim 14, wherein the first modulation scheme is a fixed modulation scheme and the second modulation scheme is used for data.

16. The method of claim 1, further comprising:

encoding the control information based on a first coding scheme if data is not being sent; and

encoding the control information based on a second coding scheme if data is being sent.

17. An apparatus for wireless communication, comprising:

at least one processor configured to;

process control information in accordance with a first processing scheme if data is not being sent; and

process the control information in accordance with a second processing scheme if data is being sent; and

a memory coupled to the at least one processor.

18. The apparatus of claim 17, wherein for the first processing scheme the at least one processor is configured to:

process the control information to obtain at least one modulation symbol;

modulate a sequence with each of the at least one modulation symbol to obtain a corresponding modulated sequence; and

map each modulated sequence to a set of subcarriers.

19. The apparatus of claim 17, wherein for the second processing scheme the at least one processor is configured to:

process the control information to obtain at least one modulation symbol;

combine the at least one modulation symbol for the control information with modulation symbols for data to obtain combined modulation symbols;

transform the combined modulation symbols from time domain to frequency domain to obtain frequency-domain symbols; and

map the frequency-domain symbols to a set of subcarriers.

20. The apparatus of claim 17, wherein the control information comprises acknowledgement (ACK) information, and wherein for the first processing scheme the at least one processor is configured to:

map the ACK information to a modulation symbol;

modulate a sequence with the modulation symbol to obtain a modulated sequence; and

map the modulated sequence to a set of subcarriers.

21. The apparatus of claim 17, wherein the control information comprises acknowledgement (ACK) information, and wherein for the second processing scheme the at least one processor is configured to:

map the ACK information to a modulation symbol;

combine the modulation symbol for the ACK information with modulation symbols for data to obtain combined modulation symbols;

transform the combined modulation symbols from time domain to frequency domain to obtain frequency-domain symbols; and

map the frequency-domain symbols to a set of subcarriers.

22. The apparatus of claim 17, wherein the at least one processor is configured to:

generate at least one modulation symbol for the control information based on a predetermined modulation scheme if data is not being sent; and

generate the at least one modulation symbol for the control information based on a modulation scheme used for data if data is being sent.

23. An apparatus for wireless communication, comprising:

means for processing control information in accordance with a first processing scheme if data is not being sent; and

means for processing the control information in accordance with a second processing scheme if data is being sent.

24. The apparatus of claim 23, wherein the means for processing the control information in accordance with the first processing scheme comprises

means for processing the control information to obtain at least one modulation symbol,

means for modulating a sequence with each of the at least one modulation symbol to obtain a corresponding modulated sequence, and

means for mapping each modulated sequence to a set of subcarriers.

25. The apparatus of claim 23, wherein the means for processing the control information in accordance with the second processing scheme comprises

means for processing the control information to obtain at least one modulation symbol,

means for combining the at least one modulation symbol for the control information with modulation symbols for data to obtain combined modulation symbols,

means for transforming the combined modulation symbols from time domain to frequency domain to obtain frequency-domain symbols, and

means for mapping the frequency-domain symbols to a set of subcarriers.

26. The apparatus of claim 23, further comprising:

means for generating at least one modulation symbol for the control information based on a predetermined modulation scheme if data is not being sent; and

means for generating the at least one modulation symbol for the control information based on a modulation scheme used for data if data is being sent.

27. A non-transitory processor-readable medium including instructions stored thereon, comprising:

a first instruction set for processing control information in accordance with a first processing scheme if data is not being sent; and

a second instruction set for processing the control information in accordance with a second processing scheme if data is being sent.

28. The non-transitory processor-readable medium of claim 27, wherein the first instruction set comprises

a third instruction set for processing the control information to obtain at least one modulation symbol,

a fourth instruction set for modulating a sequence with each of the at least one modulation symbol to obtain a corresponding modulated sequence, and

a fifth instruction set for mapping each modulated sequence to a set of subcarriers.

29. The non-transitory processor-readable medium of claim 27, wherein the second instruction set comprises

a third instruction set for processing the control information to obtain at least one modulation symbol,

a fourth instruction set for combining the at least one modulation symbol for the control information with modulation symbols for data to obtain combined modulation symbols,

a fifth instruction set for transforming the combined modulation symbols from time domain to frequency domain to obtain frequency-domain symbols, and

a sixth instruction set for mapping the frequency-domain symbols to a set of subcarriers.

30. The non-transitory processor-readable medium of claim 27, further comprising:

a third instruction set for generating at least one modulation symbol for the control information based on a predetermined modulation scheme if data is not being sent, and

a fourth instruction set for generating the at least one modulation symbol for the control information based on a modulation scheme used for data if data is being sent.

31. A method for wireless communication, comprising:

obtaining received symbols for a user equipment (UE);

processing the received symbols in accordance with a first processing scheme to obtain control information for the UE if data is not sent by the UE; and

processing the received symbols in accordance with a second processing scheme to obtain the control information for the UE if data is sent by the UE.

32. The method of claim 31, wherein the processing the received symbols in accordance with the first processing scheme comprises

performing detection on the received symbols based on a sequence to obtain demodulated symbols, and

processing the demodulated symbols to obtain the control information sent by the UE.

33. The method of claim 31, wherein the processing the received symbols in accordance with the second processing scheme comprises

performing detection on the received symbols to obtain detected symbols,

transforming the detected symbols from frequency domain to time domain to obtain demodulated symbols, and

processing the demodulated symbols to obtain the control information sent by the UE.

34. The method of claim 31, further comprising:

processing at least one received single-carrier frequency division multiplexing (SC-FDM) symbol to obtain received symbols for N total subcarriers, where N is greater than one; and

providing received symbols from subcarriers assigned to the UE as the received symbols for the UE.

35. An apparatus for wireless communication, comprising:

at least one processor configured to;

obtain received symbols for a user equipment (UE);

process the received symbols in accordance with a first processing scheme to obtain control information for the UE if data is not sent by the UE; and

process the received symbols in accordance with a second processing scheme to obtain the control information for the UE if data is sent by the UE; and

a memory coupled to the at least one processor.

36. The apparatus of claim 35, wherein for the first processing scheme the at least one processor is configured to:

perform detection on the received symbols based on a sequence to obtain demodulated symbols; and

process the demodulated symbols to obtain the control information sent by the UE.

37. The apparatus of claim 35, wherein for the second processing scheme the at least one processor is configured to:

perform detection on the received symbols to obtain detected symbols;

transform the detected symbols from frequency domain to time domain to obtain demodulated symbols; and

process the demodulated symbols to obtain the control information sent by the UE.

38. An apparatus for wireless communication, comprising:

means for obtaining received symbols for a user equipment (UE);

means for processing the received symbols in accordance with a first processing scheme to obtain control information for the UE if data is not sent by the UE; and

means for processing the received symbols in accordance with a second processing scheme to obtain the control information for the UE if data is sent by the UE.

39. The apparatus of claim 38, wherein the means for processing the received symbols in accordance with the first processing scheme comprises

means for performing detection on the received symbols based on a sequence to obtain demodulated symbols, and

means for processing the demodulated symbols to obtain the control information sent by the UE.

40. The apparatus of claim 38, wherein the means for processing the received symbols in accordance with the second processing scheme comprises

means for performing detection on the received symbols to obtain detected symbols,

means for transforming the detected symbols from frequency domain to time domain to obtain demodulated symbols, and

means for processing the demodulated symbols to obtain the control information sent by the UE.

41. A non-transitory processor-readable medium including instructions stored thereon, comprising:

a first instruction set for obtaining received symbols for a user equipment (UE);

a second instruction set for processing the received symbols in accordance with a first processing scheme to obtain control information for the UE if data is not sent by the UE; and

a third instruction set for processing the received symbols in accordance with a second processing scheme to obtain the control information for the UE if data is sent by the UE.

42. A method for wireless communication, comprising:

determining a frequency location to use for uplink transmission of control information based on an assignment for downlink transmission;

processing the control information based on a sequence to obtain modulated symbols; and

sending the modulated symbols in the frequency location determined based on the assignment.

43. The method of claim 42, wherein the processing the control information based on the sequence comprises

generating at least one modulation symbol for the control information,

modulating the sequence with each of the at least one modulation symbol to obtain a corresponding modulated sequence of modulated symbols, and

mapping each modulated sequence in the frequency location.

44. The method of claim 42, wherein the sequence comprises a CAZAC (constant amplitude zero auto-correlation) sequence, or a Zadoff-Chu sequence, or a Chu sequence.

45. The method of claim 42, wherein the sending the modulated symbols comprises sending the modulated symbols in different frequency locations in different time intervals with frequency hopping.

46. The method of claim 42, wherein the control information comprises acknowledgement (ACK) information, or channel quality indicator (CQI) information, or both.

47. An apparatus for wireless communication, comprising:

at least one processor configured to;

determine a frequency location to use for uplink transmission of control information based on an assignment for downlink transmission;

process the control information based on a sequence to obtain modulated symbols; and

send the modulated symbols in the frequency location determined based on the assignment; and

a memory coupled to the at least one processor.

48. The apparatus of claim 47, wherein the at least one processor is configured to:

generate at least one modulation symbol for the control information;

modulate the sequence with each of the at least one modulation symbol to obtain a corresponding modulated sequence of modulated symbols; and

send each modulated sequence in the frequency location.

49. The apparatus of claim 48, wherein the sequence comprises a CAZAC (constant amplitude zero auto-correlation) sequence, or a Zadoff-Chu sequence, or a Chu sequence.

50. The apparatus of claim 47, wherein the at least one processor is configured to send the modulated symbols in different frequency locations in different time intervals with frequency hopping.