Method and apparatus for determining a quality measure of a channel within a communication system
First Claim
1. A method for determining a quality measure of a channel in a communication system, the method comprising the steps of:
- determining a packet loss probability due to packet collisions;
determining a packet loss probability due to channel conditions; and
estimating the quality measure for the channel based on both the packet loss probability due to packet collisions and the packet loss probability due to channel conditions.
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Abstract
A bandwidth manager sets a target packet loss probability under the assumption that the channel is perfect. A real-time estimation of an effective probability of packet loss caused by collisions (referred to as load-specific packet loss probability) is then determined by filtering out statistics relating to packet loss probability that exceeds the target packet loss probability. The probability of packet loss caused by channel impairments (referred to as impairment-specific packet loss probability) is computed after the estimates of both the load-specific packet loss probability and an overall packet loss probability is estimated. The channel quality is then estimated in terms of the impairment-specific packet loss probability by considering the overhead due to retransmissions of lost packets caused by channel impairments.
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Citations
20 Claims
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1. A method for determining a quality measure of a channel in a communication system, the method comprising the steps of:
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determining a packet loss probability due to packet collisions;
determining a packet loss probability due to channel conditions; and
estimating the quality measure for the channel based on both the packet loss probability due to packet collisions and the packet loss probability due to channel conditions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of determining a packet loss probability due to channel conditions, the method comprising the steps of:
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sampling a number (w) of packets most recently consecutively transmitted;
determining among the w sampled packets a number (d(n)) of packets that are lost at a time when a last of the w packets (nth packet) is sampled;
computing an overall packet loss probability (p(n)) based on d(n) and w;
determining a packet loss probability due to packet collisions (T(n)) based on d(n) and w; and
determining a packet loss probability due to channel conditions (α
(n)) based on the overall packet loss probability and the packet loss probability due to collisions. - View Dependent Claims (10, 11, 12, 13)
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14. An apparatus in a communication system comprising:
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means for determining a packet loss probability due to packet collisions;
means for determining a packet loss probability due to channel conditions; and
means for estimating the quality measure for the channel based on both the packet loss probability due to packet collisions and the packet loss probability due to channel conditions. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification