IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
UP-0746265
(2003-12-29)
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등록번호 |
US-7593347
(2009-10-20)
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발명자
/ 주소 |
- Maltsev, Alexander A.
- Sadri, Ali S.
- Sergeyev, Vadim S.
- Tiraspolsky, Sergey
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출원인 / 주소 |
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대리인 / 주소 |
Pearl Cohen Zedek Latzer, LLP
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인용정보 |
피인용 횟수 :
16 인용 특허 :
15 |
초록
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Briefly, a method and apparatus to exchange channel state information between two or more stations are provided. The channel state information may be used to adapt a power, a transmission rate and a modulation scheme of a transmitted signal. In some embodiments or the invention, a method comprises a
Briefly, a method and apparatus to exchange channel state information between two or more stations are provided. The channel state information may be used to adapt a power, a transmission rate and a modulation scheme of a transmitted signal. In some embodiments or the invention, a method comprises adapting a physical layer parameter based on exchanged channel information and exchanging over a channel the adapted physical layer parameter. In particular, in some embodiments of the invention, the physical layer parameter includes a bit and power loading parameter and the method comprises calculating a bit and power loading parameter during receiving a data packet; and applying the calculated bit and power loading parameter to a portion of an exchanged data packet.
대표청구항
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What is claimed is: 1. A method of communication over a wireless channel comprising: receiving a request to send (RTS) frame that includes a header which includes a modulation scheme and a bit to select a mode of feedback channel state information (CSI) exchange scheme to exchange data between two
What is claimed is: 1. A method of communication over a wireless channel comprising: receiving a request to send (RTS) frame that includes a header which includes a modulation scheme and a bit to select a mode of feedback channel state information (CSI) exchange scheme to exchange data between two or more stations; calculating a bit and power loading (BPL) parameter during receiving the RTS frame based on said RTS frame header content; adapting a physical layer parameter based on exchanged channel information and exchanging over a channel the adapted physical layer parameter, wherein the physical layer parameter includes a bit and power loading parameter; applying the calculated bit and power loading parameter to a portion of a clear to send (CTS) frame; and modulating a portion of the CTS frame based on channel state information and said modulation scheme. 2. The method of claim 1, comprising: providing the calculated BPL parameter to a header of the CTS frame. 3. The method of claim 1, comprising providing information calculated based on information in a predefined field of the RTS frame to a header of the CTS frame. 4. The method of claim 1, comprising: determining a data exchange mode according to the bit included in the header of RTS frame. 5. The method of claim 1, wherein calculating the bit and power loading parameter comprises: estimating a channel transfer function during reception of the RTS frame; and calculating the BPL parameter based on information related to transmitted power and the estimated channel transfer function. 6. The method of claim 1, comprising: providing channel feedback information and information to be used to demodulate the CTS frame based on the training information included in the RTS frame. 7. The method of claim 1 comprising: exchanging feedback information for adaptive fragmentation of exchanged one or more data packets. 8. The method of claim 1, wherein calculating the BPL parameter comprises: estimating a signal-to-noise ratio in at least some of sub-carriers during reception of the RTS frame; and calculating the BPL parameter based on information related to transmitted power and the estimated signal-to-noise ratio of at least some of sub-carriers. 9. An apparatus comprising: a receiver to receive a request to send (RTS) frame that includes a header which includes a bit to select a mode of feedback channel state information (CSI) exchange scheme to exchange data between two or more stations; a processor to calculate a bit and power loading (BPL) parameter during reception of the RTS frame based on said RTS frame header content; a data packet generator to apply the BPL parameter to a portion of a clear to send (CTS) frame; and a modulator to modulate a portion of the CTS frame based on channel state information and modulation scheme included in the header of the RTS frame. 10. The apparatus of claim 9, wherein the data packet generator is to apply the BPL parameter to a predetermined field of the CTS frame. 11. The apparatus of claim 9, wherein the data packet generator is to apply the BPL parameter to a predetermined field header of the CTS frame. 12. The apparatus of claim 9, wherein the processor is to determine a data exchange mode according to the bit included in the header of the RTS frame. 13. The apparatus of claim 9, wherein the processor is to estimate a transfer function during reception of the RTS frame and to use information relating to transmitted power in the RTS frame to calculate the BPL parameter. 14. A wireless communication station comprising: a dipole antenna used to exchange an exchanged data packet with another wireless communication station; a receiver to receive a request to send (RTS) frame that includes a header which includes a bit to select a mode of feedback channel state information (CSI) exchange scheme to exchange data between two or more stations; a processor to calculate a bit and power loading (BPL) parameter during reception of the RTS frame based on said RTS frame header content; a data packet generator to apply the BPL parameter to a portion of a clear to send (CTS) frame; and a modulator to adapt a modulation scheme of a portion of the exchanged data packet based on channel information included in the CTS frame. 15. The wireless communication station of claim 14, wherein the data packet generator is to apply the BPL parameter to a predetermined field of the exchanged data packet. 16. The wireless communication station of claim 14, wherein the data packet generator is to provide the BPL parameter to a header of the CTS frame. 17. The wireless communication station of claim 14, wherein the processor is to determine a data exchange mode according to the bit included in the header of the RTS frame. 18. The wireless communication station of claim 14, wherein the processor is to estimate a transfer function during reception of the exchanged data packet and to use information relating to transmitted power in the RTS frame to calculate the BPL parameter. 19. A wireless communication system comprising: two or more stations to exchange data packets wherein, a station of the two or more station includes: a receiver to receive a request to send (RTS) frame that includes a header which includes a bit to select a mode of feedback channel state information (CSI) exchange scheme to exchange data between two or more stations; a processor to calculate a bit and power loading (BPL) parameter during reception of the RTS frame based on the header content; a data packet generator to apply the BPL parameter to a portion of a clear to send (CTS) frame; and a modulator to adapt a modulation scheme of a portion of the exchanged data packet based on channel information included in the CTS frame. 20. The wireless communication system of claim 19, wherein the data packet generator is to apply the BPL parameter to a predetermined field of the exchanged data packet. 21. The wireless communication system of claim 19, wherein the data packet generator is to provide the BPL parameter to a header of the CTS frame. 22. The wireless communication system of claim 19, wherein the processor is to determine a data exchange mode according to the bit included in the header of the RTS frame. 23. The wireless communication system of claim 19, wherein the processor is to estimate a transfer function during reception of the exchanged data packet and to use information relating to transmitted power in the RTS frame to calculate the BPL parameter. 24. An article comprising: a storage medium, having stored thereon instructions, that when executed, result in: receiving a request to send (RTS) frame that includes a header which includes a modulation scheme and a bit to select a mode of feedback channel state information (CSI) exchange scheme to exchange data between two or more stations; calculating a bit and power loading (BPL) parameter during receiving the RTS frame based on said RTS frame header cement; adapting a physical layer parameter based on exchanged channel information and exchanging over a channel the adapted physical layer parameter, wherein the physical layer parameter includes a bit and power loading parameter; applying the calculated bit and power loading parameter to a portion of a clear to send (CTS) frame; and modulating a portion of the CTS frame based on channel state information and said modulation scheme. 25. The article of claim 24, wherein the instructions when executed, result in: providing information calculated based on information in a predefined field of the RTS frame to a header of the CTS frame. 26. The article of claim 24, wherein the instructions when executed, result in: determining a data exchange mode according the bit included in the header of RTS frame. 27. The article of claim 24, wherein the instructions when executed, result in: providing channel feedback information and information to be used to demodulate the CTS frame based on the training information included in the RTS frame. 28. The article of claim 24, wherein the instructions when executed, result in: exchanging feedback information for adaptive fragmentation of exchanged one or more data packets. 29. The article of claim 24, wherein the instructions of calculating the BPL parameter when executed, result in: estimating a signal-to-noise ratio in at least some of sub-carriers during reception of the RTS frame; and calculating the BPL parameter based on information related to transmitted power and the estimated signal-to-noise ratio of at least some of sub-carriers.
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