METHOD AND APPARATUS FOR TRANSMISSION WITHIN A MULTI-CARRIER COMMUNICATION SYSTEM

• US 20080219219A1
• Filed: 03/07/2007
• Published: 09/11/2008
• Est. Priority Date: 03/07/2007
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Baum, Kevin L., Love, Robert T., Sun, Yakun, Classon, Brian K., Sartori, Philippe J., Krishnamoorthy, Arvind
• Granted Patent: US 7,933,238 B2
• Time in Patent Office: Days
• US Class Current: 370/335
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 5/0021 in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0083 symbol-by-symbol
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/542 using measured or perceived quality
• CPC Class Codes: H04W 72/563 of the wireless resources

Abstract

A method and apparatus are provided for indicating to a communication unit a plurality of modulation and coding schemes (MCSs) to be utilized for communication. During a first MCS is determined for first resource blocks to be sent to a first remote unit or base station, and a second MCS is determined for a second resource block to be sent to the remote unit or base station. A message is transmitted indicating the first and the second MCS and also indicating the first resource blocks and the second resource block. Finally, a first PDU is transmitted to the remote unit or base station at a first time using the first MCS and the first resource blocks and a second PDU is transmitted to the remote unit or base station at the first time using the second MCS and the second resource block.

Claims

1. A method for indicating to a communication unit a plurality of modulation and coding schemes (MCSs) to be utilized for communication, the method comprising the steps of:

determining a first MCS for first resource blocks to be sent to a first remote unit or base station;

determining a second MCS, differing from the first MCS, for a second resource block to be sent to the remote unit or base station;

transmitting a message indicating the first and the second MCS and also indicating the first resource blocks and the second resource block;

transmitting a first PDU to the remote unit or base station at a first time using the first MCS and the first resource blocks; and

transmitting a second PDU to the remote unit or base station at the first time using the second MCS and the second resource block.

2. The method of claim 1 wherein each resource block of the first and the second resource blocks comprise a contiguous set of subcarriers.

3. The method of claim 1 wherein the first and the second MCS are represented by a first and a second MCS index, respectively within the message.

4. The method of claim 1 wherein the first and the second MCS are represented by a first and a second MCS index, respectively and the message comprises the first MCS index and a difference between the first MCS index and the second MCS index.

5. The method of claim 1 further comprising the step of:

determining a first power allocation for the first resource blocks and a second power allocation for the second resource block and transmitting a second message indicating the first and second power allocations.

6. The method of claim 1 further comprising the steps of:

determining a need to send the first and the second PDUs within a single MIMO stream; and

transmitting a first MIMO codebook index within the message.

7. The method of claim 1 further comprising the step of:

transmitting a multi-antenna field within the message, where the multi-antenna field indicates that transmission is not a multi-stream transmission.

8. The method of claim 1 further comprising the step of:

transmitting a single HARQ channel indicator for the first PDU sent on the first resource blocks and the second PDU sent on the second resource block.

9. The method of claim 1 further comprising the step of:

transmitting a first HARQ channel indicator for the first PDU sent on the first resource blocks; and

transmitting a second HARQ channel indicator for the second PDU sent on the second resource block.

10. The method of claim 1 wherein the message comprises a first and a second bit, the first bit indicating a set of resource blocks the first resource blocks are allocated, and the second bit indicating a second set of resource blocks the second resource block is allocated.

11. The method of claim 1 wherein the message additionally comprises:

an identification associated with a transmitter and a bit to indicate whether the first resource blocks pertain to a first or a second set of resource blocks for the transmitter ID; and

an identification associated with the transmitter and a bit to indicate whether the second resource block pertains to the first or the second set of resource blocks for the transmitter ID.

12. A method comprising the steps of:

determining a first quality index for first resource blocks;

determining a relative quality index for at least a second resource block, wherein the relative quality index is based on a quality of the at least second resource block relative to a quality of the first resource blocks;

transmitting a message indicating the first quality index and the relative quality index, wherein the message causes a receiver to determine a first modulation and coding scheme for the first resource blocks and a second modulation and coding scheme for the at least second resource block.

13. The method of claim 12 wherein a number of bits used to represent the first quality index differs from a number of bits used to represent the relative quality index.

14. The method of claim 12 wherein each resource block from the first resource blocks comprise a first plurality of subcarriers and the second resource block comprises a second plurality of subcarriers.

15. The method of claim 12 wherein the first quality value/index is based on at least one of SNR, effective SNR, SINR, effective SINR, mutual information, MCS, or data rate.

16. An apparatus comprising:

logic circuitry performing the steps of;

determining a first MCS for first resource blocks to be sent to a first remote unit or base station; and

determining a second MCS, differing from the first MCS, for a second resource block to be sent to the remote unit or base station;

a transmitter performing the steps of;

transmitting a message indicating the first and the second MCS and also indicating the first resource blocks and the second resource block;

transmitting a first PDU to the remote unit or base station at a first time using the first MCS and the first resource blocks; and

transmitting a second PDU to the remote unit or base station at the first time using the second MCS and the second resource block.

17. The apparatus of claim 16 wherein the message comprises a first and a second bit, the first bit indicating a set of resource blocks the first resource blocks are allocated, and the second bit indicating a second set of resource blocks the second resource block is allocated.

18. An apparatus comprising:

logic circuitry performing the steps of;

determining a first quality index for first resource blocks;

determining a relative quality index for at least a second resource block, wherein the relative quality index is based on a quality of the at least second resource block relative to a quality of the first resource blocks; and

a transmitter transmitting a message indicating the first quality index and the relative quality index, wherein the message causes a receiver to determine a first modulation and coding scheme for the first resource blocks and a second modulation/coding scheme for the at least second resource block.

19. The apparatus of claim 18 wherein each resource block from the first resource blocks comprises a first plurality of subcarriers and the second resource block comprises a second plurality of subcarriers.

20. The apparatus of claim 18 wherein the first quality index is based on at least one of SNR, effective SNR, SINR, effective SINR, mutual information, MCS, or data rate.