Method for transmitting multiple streams in wireless broadcast networks

• US 7,787,517 B2
• Filed: 01/28/2005
• Issued: 08/31/2010
• Est. Priority Date: 01/28/2004
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gore, Dhananjay Ashok, Mantravadi, Ashok, Subramaniam, Anand D.
• Primary Examiner(s): Ha; Dac V
• Application Number:
  US11/046,121
• Publication Number:
  US 20050163083A1
• Time in Patent Office: 2,041 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, 370/344, 370/437, 370/441, 370/442, 370/464, 370/465, 370/480, 370/331, 455/91, 455/101, 455/103, 455/509, 455/436, 455/442, 455/443, 455/450
• US Class Current: 375/141
• 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 to reduce the coverage hole boundary between adjacent access points, said method comprising:

converting the broadcasting enhanced content into a first enhanced stream and a second base stream using a controller;

transmitting said first enhanced stream from a first access point using a first tone; and

transmitting said second base stream from said first access point using a second tone that is orthogonal to a third tone used by a second access point adjacent to said first access point;

wherein said first enhanced stream is modulated to provide additional data rate in a smaller coverage area than the second base stream;

wherein said first tone and said second tone are the same; and

further comprising layering said first enhanced stream and said second base stream on said first tone.

2. The method as claimed in claim 1, wherein transmitting said second base stream comprises using a second power level for said second base stream that is different than a first power level used for said first enhanced stream.

3. The method as claimed in claim 1, wherein transmitting said first enhanced stream and said second base stream comprise transmitting in accordance with a Code Division Multiplex Access (CDMA) scheme.

4. The method as claimed in claim 1, wherein transmitting said first enhanced stream and said second base stream comprise transmitting in accordance with an Orthogonal Frequency Division Multiplex (OFDM) scheme.

5. The method as claimed in claim 1, wherein transmitting said first enhanced stream and said second base stream comprises transmitting in accordance with an Orthogonal Frequency Division Multiple Access (OFDMA) scheme.

6. An apparatus for broadcasting a content in a wireless communication system to reduce the coverage hole boundary between said adjacent access points, said apparatus comprising:

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

means for transmitting said first enhanced stream from a first access point using a first tone; and

means for transmitting said second base stream from said first access point using a second tone that is orthogonal to a third tone used by a second access point adjacent to said first access point;

wherein said first tone and said second tone are the same tone; and

wherein said first enhanced stream is modulated to provide additional data rate in a smaller coverage area than the second base stream; and

further comprising means for layering said first enhanced stream and said second base stream on said first tone.

7. The apparatus as claimed in claim 6, further comprising means for using a second power level for transmitting said second base stream that is different than a first power level used for transmitting said first enhanced stream.

8. The apparatus as claimed in claim 6, wherein said means for transmitting said first enhanced stream and said second base stream comprise means for transmitting in accordance with a Code Division Multiplex Access (CDMA) scheme.

9. The apparatus as claimed in claim 6, wherein said means for transmitting said first enhanced stream and said second base stream comprise means for transmitting in accordance with an Orthogonal Frequency Division Multiplex (OFDM) scheme.

10. The apparatus as claimed in claim 6, wherein said means for transmitting said first enhanced stream and said second base stream comprise means for transmitting in accordance with an Orthogonal Frequency Division Multiple Access (OFDMA) scheme.

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

an electronic device, said electronic device configured to convert received content into a first enhanced stream and a second base stream, configured to transmit said first enhanced stream from a first access point using a first tone and configured to transmit said second base stream from said first access point using a second tone that is orthogonal to a third tone used by a second access point adjacent to said first access point,

wherein said first enhanced stream is modulated to provide additional data rate in a smaller coverage area than the second base stream.

12. The apparatus as claimed in claim 11, wherein said first tone and said second tone are the same tone.

13. The apparatus as claimed in claim 12, wherein

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

and

said electronic device is further configured to transmit said second base stream at a second data rate.

14. The apparatus as claimed in claim 12, wherein said electronic device is further configured to layer said first enhanced stream and said second base stream on said first tone.

15. The apparatus as claimed in claim 11, wherein

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

and

said electronic device is further configured to transmit said second base stream at a second data rate.

16. The apparatus as claimed in claim 11, said electronic device is further configured to use a second power level for transmitting said second base stream that is different than a first power level used for transmitting said first enhanced stream.

17. A machine-readable medium comprising instructions which, when executed by a machine, cause the machine to perform operations to reduce the coverage hole boundary between adjacent access points including:

converting content into a first enhanced stream and a second base stream;

transmitting said first enhanced stream from a first access point using a first tone; and

transmitting said second base stream from said first access point using a second tone that is orthogonal to a third tone used by a second access point adjacent to said first access point, wherein said first enhanced stream is modulated to provide additional data rate in a smaller coverage area than the second base stream;

wherein said first tone and said second tone are the same; and

further comprising layering said first enhanced stream and said second base stream on said first tone.