Updating path loss estimation for power control and link adaptation in IEEE 802.11h WLAN
First Claim
1. A method for determining the transmission power level among a plurality of stations located within the coverage area of a basic service set (BSS) in a wireless local area network (WLAN), comprising the steps of:
- measuring received signal power of an incoming frame by a receiving station;
calculating a path loss based on a difference between said measured received signal power and a transmit power level extracted from said incoming frame by said receiving station;
determining a path loss based on the calculated path loss, a previous path loss and a threshold value;
adjusting the transmit power level of said receiving station based on the the determined path loss; and
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adjusting the transmission rate of said receiving station based on the determined path loss.
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Abstract
A method and apparatus for determining the transmission power level between a plurality of stations located within the coverage area of a basic service set (BSS) in a wireless local area network (WLAN). The receiving station measures a received signal power from the transmitting station, then the path loss estimation is computed based on the difference between the received signal power and the transmit power level extracted from the incoming signal. The computed path loss is updated according predetermined criteria. Based on the updated path loss information, the transmit power level and/or the transmission rate of a receiving station is adjusted.
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Citations
35 Claims
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1. A method for determining the transmission power level among a plurality of stations located within the coverage area of a basic service set (BSS) in a wireless local area network (WLAN), comprising the steps of:
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measuring received signal power of an incoming frame by a receiving station; calculating a path loss based on a difference between said measured received signal power and a transmit power level extracted from said incoming frame by said receiving station; determining a path loss based on the calculated path loss, a previous path loss and a threshold value; adjusting the transmit power level of said receiving station based on the the determined path loss; and
;adjusting the transmission rate of said receiving station based on the determined path loss. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for determining the transmission power level among a plurality of stations located within the coverage area of a basic service set (BSS) in a wireless local area network (WLAN), each station having means for transmitting a frame and means for receiving a frame, the method comprising the steps of:
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transmitting a first frame from a transmitting station to a receiving station; measuring, at said receiving station, a received power level of said received first frame; extracting, at said receiving station, a transmit power level from said received first frame; calculating path loss information based on a difference between said measured received signal power and said extracted transmit power level from said first frame; adjusting, at said receiving station, the transmit power level of a future frame transmitted from said receiving station based on the difference in said calculated path loss and a previous calculated path loss and a threshold value; and adjusting the transmission rate of said second signal transmitted based on the difference in said calculated path loss and a previous calculated path loss and a threshold value. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. An apparatus having a power measurement circuit for determining the transmission power level between a plurality of stations located within the coverage area of a basic service set (BSS) in a wireless local area network (WLAN), comprising:
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a receiver circuit for demodulating an incoming signal; a power measurement circuit for measuring received signal power of said incoming signal received therein; a processor, coupled to said power measurement circuit, for calculating path loss information based on a difference between said received signal power and a transmit power level extracted from said incoming signal; a memory, coupled to said processor, for storing said calculated path loss information for a subsequent retrieval; wherein said processor determines a new transmission rate based on whether difference in said calculated path loss and a path loss information stored in said memory exceeds a threshold. - View Dependent Claims (20, 21, 22, 23, 24)
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25. An apparatus having a power measurement circuit for determining the transmission power level between a plurality of stations located within the coverage area of a basic service set (BSS) in a wireless local area network (WLAN), comprising:
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means for receiving an incoming signal; means for demodulating said incoming signal; means for measuring received signal power of said incoming signals received therein; means for calculating path loss information based on a difference between said measured received signal power and a transmit power level extracted from incoming signals; means for storing said calculated path loss information for a subsequent retrieval; and means for determining a new transmission rate based on whether a difference in said calculated path loss and a previous calculated path loss information exceeds a threshold. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification