Method and apparatus for estimating link quality

Details Method and apparatus for estimating link quality Method and apparatus for estimating link quality

2009-03-31

2011-12-27

Yao, Kwang B (Department: 2473)

Multiplex communications

Diagnostic testing

Determination of communication parameters

C370S445000

Reexamination Certificate

active

08085683

ABSTRACT:
A driver for an IEEE 802.11 wireless network node determines a metric for link quality between the node and a remote node. The nodes communicate using a handshake protocol in which the first node expects to receive an acknowledgement (ACK) of receipt of a data packet from the remote node. The driver provides a measure for: collision induced losses (pc) between the first and remote nodes; a slot being erroneously detected as busy when a successful transmission could have been made (pexp) between the first and remote nodes; and a probability of successful reception of a packet when a collision occurs (pplc) between the first and remote nodes. The measure is based on a number (A) of acknowledgements received from the remote node vis-à-vis a number (T) of packets transmitted to the remote node. The driver can adjust one of carrier sensitivity or node transmission power based on the measure.

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Malone, D., “MAC Layer Channel Quality Measurement in 802.11,” IEEE Communications Letters, Feb. 2007, pp. 143-145, vol. 11, Issue 2, IEEE.

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