Method for transmitting multiple streams in wireless broadcast networks

• US 8,385,386 B2
• Filed: 05/18/2010
• Issued: 02/26/2013
• Est. Priority Date: 01/28/2004
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Mantravadi, Ashok, Gore, Dhananjay A., Subramaniam, Anand D.
• Primary Examiner(s): HA, DAC V
• Application Number:
  US12/782,406
• Publication Number:
  US 20100226303A1
• Time in Patent Office: 1,015 Days
• Field of Search: 375/140, 375/141, 375/146, 375/260, 375/267, 375/295, 375/299, 370/203, 370/204, 370/319, 370/321, 370/331, 370/344, 370/437, 370/441, 370/442, 370/464, 370/465, 370/480, 455/91, 455/101, 455/103, 455/509, 455/436, 455/442, 455/443, 455/450
• US Class Current: 375/146
• CPC Class Codes: H04H 20/28 Arrangements for simultaneous broadcast of plural pieces of information
• CPC Class Codes: H04H 20/33 by plural channels
• CPC Class Codes: H04H 20/42 Arrangements for resource management
• CPC Class Codes: H04H 20/72 of terrestrial networks
• CPC Class Codes: H04L 5/023 Multiplexing of multicarrier modulation signals multicarrier modulation H04L27/2601
• CPC Class Codes: H04L 5/06 the signals being represented by different frequencies combined with time-division multiplexing H04L5/26

Abstract

Accordingly, a method and apparatus are provided to convert received content into a first stream and a second stream, to transmit said first stream using a first tone and to transmit said second stream using an orthogonal scheme. A layering scheme is used to transmit the base stream covering a smaller area and an enhanced stream is used to cover a large utilizing orthogonal scheme.

Claims

1. A method of broadcasting a content in a wireless communication system, said method comprising acts of:

converting the content into a first stream and a second stream;

allocating a first set of tones and a second set of tones to a first access point, wherein the first set of tones has a coverage smaller than a coverage of the second set of tones;

transmitting from the first access point said first stream using the first set of tones; and

transmitting from the first access point said second stream using the second set of tones.

2. The method as claimed in claim 1, wherein said second set of tones is orthogonal to a tone used by a second access point adjacent to the first access point.

3. The method as claimed in claim 1, further comprising an act of transmitting said first stream using second set of tones along with said second stream.

4. The method as claimed in claim 3, further comprising an act of layering said first stream and said second stream on said first tone.

5. The method as claimed in claim 1, wherein

said act of transmitting said first stream comprises act of transmitting said first stream at a first data rate;

and

said act of transmitting said second stream comprises act of transmitting said second stream at a second data rate different from said first data rate.

6. The method as claimed in claim 5, wherein

said second data rate is lower than said first data rate.

7. The method as claimed in claim 1, further comprising an act of transmitting said second stream using a power level for said second stream that is different from a power level used for first stream.

8. The method as claimed in claim 1, wherein the said of transmitting further comprising act of transmitting in accordance with a Code Division Multiplex Access (CDMA) scheme.

9. The method as claimed in claim 1, wherein the said of transmitting further comprising act of transmitting in accordance with an Orthogonal Frequency Division Multiplex (OFDM) scheme.

10. The method as claimed in claim 1, wherein said act of transmitting further comprising act of transmitting in accordance with an Orthogonal Frequency Division Multiple Access (OFDMA) scheme.

11. An apparatus for broadcasting a content in a wireless communication system, said apparatus comprising:

means for converting the content into a first stream and a second stream;

means for allocating a first set of tones and a second set of tones to a first access point, wherein the first set of tones has a coverage smaller than a coverage of the second set of tones;

means for transmitting from the first access point said first stream using the first set of tones; and

means for transmitting from the first access point said second stream using the second set of tones.

12. The apparatus as claimed in claim 11, wherein said second set of tones is orthogonal to a tone used by a second access point adjacent to the first access point.

13. The apparatus as claimed in claim 11, further comprising means for transmitting said first stream using said second set of tones along with said second stream.

14. The apparatus as claimed in claim 13, further comprising an means for layering said first stream and said second stream on said first tone.

15. The apparatus as claimed in claim 11, wherein

said means for transmitting said first stream comprises means for transmitting said first stream at a first data rate;

and

said means for transmitting said second stream comprises means for transmitting said second stream at a second data rate different from the first data rate.

16. The apparatus as claimed in claim 15, wherein

said second data rate is lower that said first data rate.

17. The apparatus as claimed in claim 11, further comprising means for using a power level for transmitting said second stream that is different from a power level used for first stream.

18. The apparatus as claimed in claim 11, wherein the said of transmitting further comprising means for transmitting in accordance with a Code Division Multiplex Access (CDMA) scheme.

19. The apparatus as claimed in claim 11, wherein the said of transmitting further comprising means for transmitting in accordance with an Orthogonal Frequency Division Multiplex (OFDM) scheme.

20. The apparatus as claimed in claim 11, wherein said means for transmitting further comprising means for transmitting in accordance with an Orthogonal Frequency Division Multiple Access (OFDMA) scheme.

21. In a wireless communication system, an apparatus comprising:

an electronic device, said electronic device configured to convert a received content into a first stream and a second stream, configured to allocating a first set of tones and a second set of tones to a first access point, wherein the first set of tones has a coverage smaller than a coverage of the second set of tones, configured to transmit said first stream using said first set of tones and configured to transmit said second stream using the second set of tones.

22. The apparatus as claimed in claim 21, wherein said second set of tones is orthogonal to a tone used by a second access point adjacent to the first access point.

23. The apparatus as claimed in claim 21, said electronic device further configured to transmit said first stream using said second set of tones along with said second stream.

24. The apparatus as claimed in claim 23, said electronic device is further configured to layer said first stream and said second stream on said first tone.

25. The apparatus as claimed in claim 21, wherein

said electronic device is further configured to transmit said first stream at a first data rate;

and

said electronic device is further configured to transmit said second stream at a second data rate different from the first data rate.

26. The apparatus as claimed in claim 25, wherein said first data rate said is faster than said second data rate.

27. The apparatus as claimed in claim 21, said electronic device is further configured to use a power level that is different from a power level used for first stream.

28. A machine-readable medium comprising instructions which, when executed by a machine, cause the machine to perform operations including:

converting the content into a first stream and a second stream;

allocating a first set of tones and a second set of tones to an access point, wherein the first set of tones has a coverage smaller than a coverage of the second set of tones;

transmitting said first stream using the first set of tones; and

transmitting said second stream using the second set of tones.

29. The machine-readable medium a claimed in claim 28, wherein said second set of tones is orthogonal to a tone used by a second access point adjacent to the first access point.

30. A broadcast system, said system comprising:

a first access point and an adjacent access point;

said first access point configured to convert a content into a first stream and a second stream;

transmit said first stream using a first set of tones allocated thereto the first access point; and

transmit said second stream using a second set of tones allocated to the first access point, wherein the first set of tones has a coverage smaller than a coverage of the second set of tones.

31. The broadcast system as claimed in claim 30, wherein said second set of tones is orthogonal to a tone used by said adjacent access point.