Method and system for multicarrier communication between a base station and subscribers of different bandwidths

• US 7,613,242 B2
• Filed: 06/23/2005
• Issued: 11/03/2009
• Est. Priority Date: 11/29/2004
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Intel Corporation
• Inventors: Bykovnikov, Vladimir
• Primary Examiner(s): Kim; Kevin Y
• Application Number:
  US10/572,125
• Publication Number:
  US 20080304581A1
• Time in Patent Office: 1,594 Days
• Field of Search: 375/260
• US Class Current: 375/260
• CPC Class Codes: H04L 27/2602 Signal structure
• CPC Class Codes: H04L 27/2626 Arrangements specific to the transmitter only
• CPC Class Codes: H04L 5/023 Multiplexing of multicarrier modulation signals multicarrier modulation H04L27/2601
• CPC Class Codes: H04L 5/026 using code division

Abstract

A multicarrier base station communicates with subscriber stations of different bandwidth profiles by allocating time slots in downlink and uplink frames and subcarriers of a single multicarrier communication channel to various bandwidth subchannels.

Claims

1. An apparatus for use in a base station in a multicarrier wireless communication system, said apparatus comprising:

a scheduler to determine bandwidth profiles of multicarrier subscriber stations associated with the base station and to generate an updated multicarrier frame structure for use by the base station to communicate with said multicarrier subscriber stations based on said bandwidth profiles, said bandwidth profiles being indicative of operating bandwidths of corresponding multicarrier subscriber stations, said updated multicarrier frame structure to include a plurality of time slots that each have a predetermined number of subcarriers distributed across a full channel bandwidth, wherein each multicarrier subscriber station can be one of;

a full channel subscriber station and a subchannel subscriber station;

wherein said scheduler is to determine a number of full-channel downlink data time slots, a number of sub-channel downlink data time slots, a number of full-channel uplink data time slots, and a number of sub-channel uplink data time slots to include in said updated multicarrier frame structure based on one or more factors, said one or more factors including said bandwidth profiles of said multicarrier subscriber stations associated with the base station.

2. The apparatus of claim 1, wherein:

said scheduler is to generate an updated multicarrier frame structure on a frame-by-frame basis during operation of the base station.

3. The apparatus of claim 1, wherein:

said scheduler is to include a single preamble time slot in said updated multicarrier frame structure for use by multicarrier subscriber stations to synchronize to the base station, said single preamble time slot for use by full channel subscriber stations and subchannel subscriber stations.

4. The apparatus of claim 1, wherein:

said scheduler is to include one preamble time slot in said updated multicarrier frame structure for use by full channel subscriber stations to synchronize to the base station and another preamble time slot in said updated multicarrier frame structure for use by subchannel subscriber stations to synchronize to the base station.

5. The apparatus of claim 1, wherein:

said scheduler is to include a maximum of one ranging time slot in said updated multicarrier frame structure for use by multicarrier subscriber stations to request assignment of one or more data time slots, said one ranging time slot for use by full channel subscriber stations and subchannel subscriber stations.

6. The apparatus of claim 5, wherein:

subscriber stations use code division multiple access (CDMA) techniques to transmit during said one ranging time slot, each subscriber station having a unique CDMA code, said apparatus including CDMA decoding functionality for decoding information transmitted within said one ranging time slot.

7. The apparatus of claim 1, wherein:

said scheduler is to include one mapping time slot in said updated multicarrier frame structure for use by both full channel subscriber stations and subchannel subscriber stations, said one mapping time slot to include information that is descriptive of said updated multicarrier frame structure.

8. The apparatus of claim 1, wherein:

said scheduler is to include one mapping time slot in said updated multicarrier frame structure for use by full channel subscriber stations and another mapping time slot in said updated multicarrier frame structure for use by subchannel subscriber stations, said mapping time slots to include information that is descriptive of said updated multicarrier frame structure.

9. The apparatus of claim 1, wherein:

said one or more factors further includes at least one of;

channel load and subscriber station priorities.

10. The apparatus of claim 1, wherein:

said apparatus is for use in an orthogonal frequency division multiplexing based wireless communication system.

11. A method comprising:

determining bandwidth profiles of multicarrier subscriber stations associated with a multicarrier base station, said bandwidth profiles being indicative of operating bandwidths of corresponding multicarrier subscriber stations; and

updating a multicarrier frame structure used to support communication between said base station and said multicarrier subscriber stations based on said bandwidth profiles to generate an updated multicarrier frame structure, said updated multicarrier frame structure including a plurality of time slots that each have a predetermined number of subcarriers distributed across a full channel bandwidth, wherein each multicarrier subscriber station can be one of;

a full channel subscriber station and a subchannel subscriber station;

wherein said undated multicarrier frame structure includes one mapping time slot for use by full channel subscriber stations and another mapping time slot for use by subchannel subscriber stations, each of said mapping time slots to include information that is descriptive of said updated multicarrier frame structure.

12. The method of claim 11, further comprising:

repeating updating on a frame by frame basis during operation of said base station.

13. The method of claim 11, wherein:

said updated multicarrier frame structure includes one preamble time slot for use by multicarrier subscriber stations to synchronize to said base station, said one preamble time slot for use by full channel subscriber stations and subchannel subscriber stations.

14. The method of claim 11, wherein:

said updated multicarrier frame structure includes one preamble time slot for use by full channel subscriber stations to synchronize to said base station and another preamble time slot for use by subchannel subscriber stations to synchronize to said base station.

15. The method of claim 11, wherein:

said updated multicarrier frame structure includes a maximum of one ranging time slot for use by multicarrier subscriber stations to request assignment of one or more data time slots, said one ranging time slot for use by full channel subscriber stations and subchannel subscriber stations.

16. The method of claim 15, wherein:

said multicarrier subscriber stations use code division multiple access (CDMA) techniques to transmit during said one ranging time slot, each subscriber station having a unique CDMA code.

17. The method of claim 11, wherein:

said updated multicarrier frame structure includes a number of full-channel downlink data time slots, a number of sub-channel downlink data time slots, a number of full-channel unlink data time slots, and a number of sub-channel uplink data time slots.

18. A computer implemented method comprising:

determining whether a multicarrier base station is a heterogeneous base station that is capable of servicing multicarrier subscriber stations having different bandwidth profiles, based on a frame received from said multicarrier base station;

looking for mapping information within an Mth time slot of said frame when said base station is a heterogeneous base station; and

looking for mapping information within an Nth time slot of said frame when said base station is not a heterogeneous base station, wherein M and N are positive, unequal integers;

wherein said mapping information is descriptive of a present frame structure associated with said base station.

19. The method of claim 18, wherein:

determining includes determining whether said base station is a heterogeneous base station based on a preamble within said frame received from said base station.

20. The method of claim 18, wherein:

said mapping information includes time slot allocations to multicarrier subscriber stations associated with said base station.

21. The method of claim 18, wherein:

said mapping information includes an indication of modulation/coding schemes associated with multicarrier subscriber stations.

22. A system comprising:

at least one dipole antenna to provide a transition between said system and a wireless channel; and

an apparatus, in communication with said at least one dipole antenna, comprising a scheduler to determine bandwidth profiles of multicarrier subscriber stations associated with the base station and to generate an updated multicarrier frame structure for use by the base station to communicate with said multicarrier subscriber stations based on said bandwidth profiles, said bandwidth profiles being indicative of operating bandwidths of corresponding multicarrier subscriber stations, said updated multicarrier frame structure to include a plurality of time slots that each have a predetermined number of subcarriers distributed across a full channel bandwidth, wherein each multicarrier subscriber station can be one of;

a full channel subscriber station and a subchannel subscriber station;

wherein said scheduler is to include a single preamble time slot in said updated multicarrier frame structure for use by multicarrier subscriber stations to synchronize to the base station, said single preamble time slot for use by full channel subscriber stations and subchannel subscriber stations.

23. The system of claim 22, wherein:

said scheduler is to include a maximum of one ranging time slot in said updated multicarrier frame structure for use by multicarrier subscriber stations to request assignment of one or more data time slots, said one ranging time slot for use by full channel subscriber stations and subchannel subscriber stations.

27. The system of claim 23, wherein:

subscriber stations use code division multiple access (CDMA) techniques to transmit during said one ranging time slot, each subscriber station having a unique CDMA code, said apparatus including CDMA decoding functionality for decoding information transmitted within said one ranging time slot.

28. The system of claim 22, wherein:

said scheduler is to determine a number of full-channel downlink data time slots, a number of sub-channel downlink data time slots, a number of full-channel uplink data time slots, and a number of sub-channel uplink data time slots to include in said updated multicarrier frame structure based on one or more factors, said one or more factors including said bandwidth profiles of said multicarrier subscriber stations associated with the base station.

29. The system of claim 22, wherein:

said scheduler is to include one mapping time slot in said updated multicarrier frame structure for use by both full channel subscriber stations and subchannel subscriber stations, said one mapping time slot to include information that is descriptive of said updated multicarrier frame structure.

24. An article comprising a computer readable storage medium having instructions stored thereon that, when executed by a computing platform, operate to:

determine bandwidth profiles of multicarrier subscriber stations associated with a multicarrier base station, said bandwidth profiles being indicative of operating bandwidths of corresponding multicarrier subscriber stations; and

update a multicarrier frame structure used to support communication between said multicarrier base station and said multicarrier subscriber stations based on said bandwidth profiles to generate an updated multicarrier frame structure, said updated multicarrier frame structure to include a plurality of time slots that each have a predetermined number of subcarriers distributed across a full channel bandwidth, wherein each multicarrier subscriber station can be one of;

a full channel subscriber station and a subchannel subscriber station;

wherein said updated multicarrier frame structure is to include a maximum of one ranging time slot for use by multicarrier subscriber stations to request assignment of one or more data time slots, said one ranging time slot for use by full channel subscriber stations and subchannel subscriber stations.

25. The article of claim 24, wherein:

said updated multicarrier frame structure is to include one preamble time slot for use by multicarrier subscriber stations to synchronize to said multicarrier base station, said one preamble time slot for use by full channel subscriber stations and subchannel subscriber stations.

26. The article of claim 24, wherein:

said multicarrier subscriber stations use code division multiple access (CDMA) techniques to transmit during said one ranging time slot, each subscriber station having a unique CDMA code.