OFDMA with adaptive subcarrier-cluster configuration and selective loading

• US 8,964,719 B2
• Filed: 09/12/2011
• Issued: 02/24/2015
• Est. Priority Date: 12/15/2000
• Status: Expired due to Fees

• Current Assignee: Adaptix, Inc. (Acacia Research Corporation)
• Original Assignee: Adaptix, Inc. (Acacia Research Corporation)
• Inventors: Li, Xiaodong, Liu, Hui, Li, Kemin, Zhang, Wenzhong
• Primary Examiner(s): ZEWDU, MELESS NMN
• Application Number:
  US13/230,625
• Publication Number:
  US 20120069755A1
• Time in Patent Office: 1,261 Days
• Field of Search: 455/45, 455/67.11, 455/62, 455/63.2, 455101-103, 455132-134, 455/418, 455/434, 455443-445, 455447-451, 4554521-4522, 455/500, 455509-513, 455/522, 455/526, 455/550.1, 455/556.2, 455/561, 455/63.4, 455/453, 370/252, 370328-334, 370/338, 370/341, 370343-345, 370348-350, 370/310, 370/312, 370/319, 370436-437, 370/485, 370/491, 370/493, 375/260, 375/267, 375/299, 375/347
• US Class Current: 370/344
• 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 in an orthogonal frequency division multiple access (OFDMA) wireless system, said method comprising:

receiving, at a base station from a first subscriber station located in a first sector of a cell of said OFDMA wireless system, first channel quality and interference information of subcarriers;

receiving, at said base station from a second subscriber station located in a second sector of said cell of said OFDMA wireless system, second channel quality and interference information of said subcarriers;

analyzing, at said base station, said first and second channel quality and interference information of said subcarriers received from said first and second subscriber stations, respectively; and

allocating, by said base station, at least some of said subcarriers to said first and second subscriber stations based on said analyzing of said first and second channel quality and interference information of said subcarriers received from said first and second subscriber stations, respectively, said allocating of said at least some of said subcarriers comprising;

allocating, by said base station, a first plurality of said subcarriers to said first subscriber station located in said first sector of said cell, said allocating of said first plurality of said subcarriers to said first subscriber station being based on said first and second channel quality and interference information of said subcarriers received from said first and second subscriber stations, respectively; and

allocating, by said base station, a second plurality of said subcarriers to said second subscriber station located in said second sector of said cell, said allocating of said second plurality of said subcarriers to said second subscriber station being based on said first and second channel quality and interference information of said subcarriers received from said first and second subscriber stations, respectively, said allocated first plurality of said subcarriers being different than said allocated second plurality of said subcarriers.

2. The method of claim 1, wherein said first and second channel quality and interference information of said subcarriers comprises signal to noise plus interference ratio (SINR) information sufficient to determine SINR.

3. The method of claim 2, wherein said first and second channel quality and interference information of said subcarriers further comprises received signal strength (RSS) information sufficient to determine RSS.

4. The method of claim 3, further comprising:

summing said RSS information and said SINR information of said subcarriers; and

prioritizing said subcarriers based on said summing.

5. The method of claim 1, wherein said first and second channel quality and interference information of said subcarriers comprises SINR information relating to pilot symbols transmitted over said wireless communication.

6. The method of claim 1, wherein said first and second channel quality and interference information of said subcarriers comprises SINR information relating to data symbols transmitted over said wireless communication.

7. The method of claim 1, wherein said first and second channel quality and interference information of said subcarriers includes at least one of inter-cell interference information and intra-cell traffic information.

8. The method of claim 1, further comprising:

re-allocating, from time to time, by said base station, a new plurality of said subcarriers different than said first plurality of said subcarriers to said first subscriber station located in said first sector of said cell and a new plurality of said subcarriers different than said second plurality of said subcarriers to said second subscriber station located in said second sector of said cell, said re-allocating said new plurality of said subcarriers different than said first plurality of said subcarriers and said new plurality of said subcarriers different than said second plurality of said subcarriers being based on new channel quality and interference information of said subcarriers received from said first and second subscriber stations.

9. A method for wireless communication in an orthogonal frequency division multiple access (OFDMA) wireless system, said method comprising:

sending a first instruction, said first instruction being sent from a base station to a first subscriber station located in a first sector of a cell of said OFDMA wireless system to measure a first channel quality and interference information of subcarriers, said subcarriers being available for said wireless communication between said base station and said first subscriber station;

sending a second instruction, said second instruction being sent from said base station to a second subscriber station located in a second sector of said cell of said OFDMA wireless system to measure a second channel quality and interference information of said subcarriers, said subcarriers being available for said wireless communication between said base station and said second subscriber station;

receiving, at said base station, said first channel quality and interference information of said subcarriers measured from said first subscriber station;

receiving, at said base station, said second channel quality and interference information of said subcarriers measured from said second subscriber station;

allocating, by said base station, a first plurality of said subcarriers to said first subscriber station located in said first sector of said cell, said allocating of said first plurality of said subcarriers to said first subscriber station being based on said first and second measured channel quality and interference information of said subcarriers received from said first and second subscriber stations, respectively; and

allocating, by said base station, a second plurality of said subcarriers to said second subscriber station located in said second sector of said cell, said allocating of said second plurality of said subcarriers to said second subscriber station being based on said first and second measured channel quality and interference information of said subcarriers received from said first and second subscriber stations, respectively, said allocated first plurality of said subcarriers being different than said allocated second plurality of said subcarriers.

10. The method of claim 9, wherein said allocating of said first and second plurality of said subcarriers to said first and second subscriber stations, respectively, comprises allocating at least one of a diversity cluster and a coherence cluster to said first subscriber station and said second subscriber station.

11. The method of claim 9, wherein said allocating of said first plurality of said subcarriers to said first subscriber station comprises allocating additional subcarriers of said subcarriers to said first subscriber station when said first measured channel quality and interference information of said subcarriers from said first subscriber station is below a determined value.

12. The method of claim 9, wherein said allocating of said first plurality of said subcarriers to said first subscriber station comprises allocating additional subcarriers of said subcarriers to said first subscriber station after first determining if there are subscriber stations other than said first subscriber station requesting subcarriers.

13. The method of claim 9, further comprising:

re-allocating, from time to time, by said base station, a new plurality of said subcarriers different than said first plurality of said subcarriers to said first subscriber station located in said first sector of said cell and a new plurality of said subcarriers different than said second plurality of said subcarriers to said second subscriber station located in said second sector of said cell, said re-allocating said new plurality of said subcarriers different than said first plurality of said subcarriers and said new plurality of said subcarriers different than said second plurality of said subcarriers being based on newly measured channel quality and interference information of said subcarriers received from said first and second subscriber stations.

14. The method of claim 9, wherein said first and second measured channel quality and interference information of said subcarriers includes at least one of inter-cell interference information and intra-cell traffic information.

15. A base station for wireless communication in an orthogonal frequency division multiple access (OFDMA) wireless system, said base station comprising:

a controller configured to;

receive, from a first subscriber station located in a first sector of a cell of said OFDMA wireless system, first channel quality and interference information of subcarriers;

receive, from a second subscriber station located in a second sector of said cell of said OFDMA wireless system, second channel quality and interference information of said subcarriers;

analyze said first and second channel quality and interference information of said subcarriers received from said first and second subscriber stations, respectively; and

allocate at least some of said subcarriers to said first and second subscriber stations based on said analysis of said first and second channel quality and interference information of said subcarriers received from said first and said second subscriber stations, respectively, said allocation of said at least some of said subcarriers comprising;

allocating a first plurality of said subcarriers to said first subscriber station located in said first sector of said cell, said allocation of said first plurality of said subcarriers to said first subscriber station being based on said first and second channel quality and interference information of said subcarriers received from said first and second subscriber stations, respectively; and

allocating a second plurality of said subcarriers to said second subscriber station located in said second sector of said cell, said allocation of said second plurality of said subcarriers to said second subscriber station being based on said first and second channel quality and interference information of said subcarriers received from said first and second subscriber stations, respectively, said first plurality of said subcarriers being different than said second plurality of said subcarriers.

16. The base station of claim 15, wherein said first and second channel quality and interference information of said subcarriers comprises signal to noise plus interference ratio (SINR) information sufficient to determine SINR.

17. The base station of claim 16, wherein said first and second channel quality and interference information of said subcarriers further comprises received signal strength (RSS) information sufficient to determine RSS.

18. The base station of claim 17, wherein said controller is further configured to:

sum said RSS information and said SINR information of said subcarriers; and

prioritize said subcarriers based on said summation.

19. The base station of claim 15, wherein said first and second channel quality and interference information of said subcarriers comprises SINR information relating to pilot symbols transmitted over said wireless communication.

20. The base station of claim 15, wherein said first and second channel quality and interference information of said subcarriers comprises SINR information relating to data symbols transmitted over said wireless communication.

21. The base station of claim 15, wherein said first and second channel quality and interference information of said subcarriers includes at least one of inter-cell interference information and intra-cell traffic information.

22. The base station of claim 15, wherein said controller is further configured to:

re-allocate, from time to time, a new plurality of said subcarriers different than said first plurality of said subcarriers to said first subscriber station located in said first sector of said cell and a new plurality of said subcarriers different than said second plurality of said subcarriers to said second subscriber station located in said second sector of said cell, said re-allocation of said new plurality of said subcarriers different than said first plurality of said subcarriers and said new plurality of said subcarriers different than said second plurality of said subcarriers being based on new channel quality and interference information of said subcarriers received from said first and second subscriber stations.

23. A base station for wireless communication in an orthogonal frequency division multiple access (OFDMA) wireless system, said base station comprising:

a controller configured to;

send a first instruction, said first instruction being sent from said base station to a first subscriber station located in a first sector of cell of said OFDMA wireless system to measure a first channel quality and interference information of subcarriers, said subcarriers being available for said wireless communication between said base station and said first subscriber station;

send a second instruction, said second instruction being sent from said base station to a second subscriber station located in a second sector of said cell of said OFDMA wireless system to measure a second channel quality and interference information of said subcarriers, said subcarriers being available for said wireless communication between said base station and said second subscriber station;

receive said first channel quality and interference information of said subcarriers measured from said first subscriber station;

receive said second channel quality and interference information of said subcarriers measured from said second subscriber station; and

allocate a first plurality of said subcarriers to said first subscriber station located in said first sector of said cell, said allocation of said first plurality of said subcarriers to said first subscriber station being based on said first and second measured channel quality and interference information of said subcarriers received from said first and second subscriber stations;

respectively; and

allocate a second plurality of said subcarriers to said second subscriber station located in said second sector of said cell, said allocation of said second plurality of said subcarriers to said second subscriber station being based on said first and second measured channel quality and interference information of said subcarriers received from said first and second subscriber stations, respectively, said first plurality of said subcarriers being different than said second plurality of said subcarriers.

24. The base station of claim 23, wherein said allocation of said first and second plurality of said subcarriers to said first and second subscriber stations, respectively, comprises allocating at least one of a diversity cluster and a coherence cluster to said first subscriber station and said second subscriber station.

25. The base station of claim 23, wherein said allocation of said first plurality of said subcarriers to said first subscriber station comprises allocating additional subcarriers of said subcarriers to said first subscriber station when said first measured channel quality and interference information of said subcarriers from said first subscriber station is below a determined value.

26. The base station of claim 23, wherein said allocation of said first plurality of said subcarriers to said first subscriber station comprises allocating additional subcarriers of said subcarriers to said first subscriber station after first determining if there are subscriber stations other than said first subscriber station requesting subcarriers.

27. The base station of claim 23, wherein said controller is further configured to:

re-allocate, from time to time, a new plurality of said subcarriers different than said first plurality of said subcarriers to said first subscriber station located in said first sector of said cell and a new plurality of said subcarriers different than said second plurality of said subcarriers to said second subscriber station located in said second sector of said cell, said re-allocation of said new plurality of said subcarriers different than said first plurality of said subcarriers and said new plurality of said subcarriers different than said second plurality of said subcarriers being based on newly measured channel quality and interference information of said subcarriers received from said first and second subscriber stations.

28. The base station of claim 23, wherein said first and second measured channel quality and interference information of said subcarriers includes at least one of inter-cell interference information and intra-cell traffic information.