Multi-Carrier Communications With Adaptive Cluster Configuration and Switching

• US 20110222495A1
• Filed: 03/21/2011
• Published: 09/15/2011
• Est. Priority Date: 12/15/2000
• Status: Abandoned Application

• Current Assignee: Adaptix, Inc. (Acacia Research Corporation)
• Original Assignee: Adaptix, Inc. (Acacia Research Corporation)
• Inventors: Zhang, Wenzhong, Li, Xiaodong, Liu, Hui, Li, Kemin
• Application Number:
  US13/053,127
• Publication Number:
  US 20110222495A1
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04B 17/336 Signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]
• CPC Class Codes: H04B 17/345 Interference values signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336
• CPC Class Codes: H04J 11/00 Orthogonal multiplex systems, e.g. using WALSH codesH04J13/00 takes precedence
• CPC Class Codes: H04J 11/003 at the transmitter transmission to multiple receive units in multiple input multiple output [MIMO] H04B7/0452; transmit antenna weighting H04B7/0615
• CPC Class Codes: H04J 11/005 of intercell interference
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0005 applied to payload information
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0011 applied to payload information
• 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 1/0079 Formats for control data H04L1/16 takes precedence; training sequences H04L25/00 and H04L27/00
• CPC Class Codes: H04L 1/04 using frequency diversity
• CPC Class Codes: H04L 25/0226 sounding signals per se
• CPC Class Codes: H04L 25/0228 with direct estimation from sounding signals
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 47/125 by balancing the load, e.g. traffic engineering
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0032 Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
• CPC Class Codes: H04L 5/0035 : Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0037 : Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0042 : intra-user or intra-terminal allocation
• CPC Class Codes: H04L 5/0046 : Determination of how many bits are transmitted on different sub-channels
• CPC Class Codes: H04L 5/0048 : Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/005 : of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04L 5/006 : Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0064 : Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04L 5/0073 : Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04L 5/0082 : at predetermined intervals
• CPC Class Codes: H04L 5/0094 : Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04L 5/023 : Multiplexing of multicarrier modulation signals multicarrier modulation H04L27/2601
• CPC Class Codes: H04W 24/08 : Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 72/04 : Wireless resource allocation
• CPC Class Codes: H04W 72/0453 : Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/20 : Control channels or signalling for resource management
• CPC Class Codes: H04W 72/23 : in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/541 : using the level of interference
• CPC Class Codes: H04W 72/542 : using measured or perceived quality
• CPC Class Codes: H04W 74/04 : Scheduled access hybrid access H04W74/02

Abstract

A method and apparatus for allocating subcarriers in an orthogonal frequency division multiple access (OFDMA) system is described. In one embodiment, the method comprises allocating at least one diversity cluster of subcarriers to a first subscriber and allocating at least one coherence cluster to a second subscriber.

Claims

1. A method for wireless communication, said method comprising:

allocating a first set of one or more subcarriers to a subscriber over a wireless link with said subscriber;

receiving information indicative of quality of said allocated subcarriers;

changing at least one of the modulation scheme used over said wireless link or the data coding used over said wireless link; and

transmitting a second set of one or more subcarriers to said subscriber, wherein

said second set has at least a different modulation scheme or data coding than said first set.

2. The method of claim 1 further comprising comparing said information indicative of quality to a determined value, wherein said changing is further based upon said comparison.

3. The method of claim 2 wherein said determined value is dynamic.

4. The method of claim 2 wherein said information indicative of quality is signal to interference plus noise ratio (SINR) information relating to said one or more allocated subcarriers.

5. The method of claim 2 wherein said information indicative of quality is signal to noise ratio (SNR) information relating to said one or more allocated subcarriers.

6. The method of claim 1 further comprising:

receiving information indicative of quality of said second allocated subcarriers;

in response to receiving said information indicative of quality of said second allocated subcarriers, changing said second allocation; and

transmitting a third set of one or more subcarriers to said subscriber, wherein

said third set has at least a different modulation scheme or data coding than said second set.

7. The method of claim 4 wherein said comparing comprises comparing SINR information to pilot symbol information transmitted over said wireless link.

8. The method of claim 4 wherein said comparing comprises comparing SINR information to data symbol information transmitted over said wireless link.

9. The method of claim 2 further comprising changing said allocation to said subscriber based upon said comparison, wherein changing said allocation comprises allocating diversity clusters of subcarriers to said subscriber.

10. The method of claim 9 wherein the number of diversity clusters allocated to said subscriber increases as the amount at which said receiving information indicative of quality of falls below said determined value increases.

11. The method of claim 1 wherein said allocating comprises allocating a first portion of subcarriers to a subscriber located in a first sector of a cell and allocating a second portion of subcarriers to a subcarrier located in a second sector of a cell;

wherein said receiving comprises receiving information indicative of quality of subcarriers allocated to each of said subscriber in said first sector and said subscriber in said second sector; and

wherein said changing comprises changing at least one of the modulation scheme or the data coding for at least one of said first and second subscribers.

12. The method of claim 2 further comprising changing said allocation to said subscriber based upon said comparison wherein changing said allocation is performed after said allocating, receiving, and increases communication bandwidth over said wireless link.

13. The method of claim 1 wherein said transmitting a second set of one or more subcarriers to said subscriber comprises transmitting information indicative of the modulation to be use for said wireless link.

14. The method of claim 1 wherein said transmitting a second set of one or more subcarriers to said subscriber comprises transmitting information indicative of the coding to be use for said wireless link.

15. The method of claim 1 wherein said changing at least one of the modulation scheme used over said wireless link or the data coding used over said wireless link is performed in response to receiving said information indicative of quality.

16. A method for wireless communication, said method comprising:

receiving a first allocation of one or more subcarriers from a base station over a wireless communication link with said base station;

transmitting information indicative of quality of said one or more subcarriers to said base station; and

receiving a second allocation of one or more subcarriers from said base station;

wherein

said second allocation has at least a different modulation scheme or data coding than said first allocation.

17. The method of claim 16 wherein said information indicative of quality is signal to interference plus noise ratio (SINR) information relating to said one or more allocated subcarriers.

18. The method of claim 16 wherein said information indicative of quality is signal to noise ratio (SNR) information relating to said one or more allocated subcarriers.

19. The method of claim 16 further comprising:

transmitting, in response to receiving said second allocation, information indicative of quality of said second one or more subcarriers to said base station; and

receiving a third allocation of one or more subcarriers from said base station, said third allocation based, at least in part, on said second transmitted information;

wherein

said third allocation has at least a different modulation scheme or data coding than said second allocation.

20. The method of claim 16 wherein said transmitting information indicative of quality of said one or more subcarriers to said base station is performed in response to said receiving said first allocation.