Generalised link-layer adaptation with costly power under higher-layer criteria
Princeton, NJ(2011)
摘要
It has long been recognised that a wireless communication system can be more efficient if link-layer parameters such as modulation order, symbol rate and packet size, are (adaptively) optimised. A common optimising criterion is to maximise spectral efficiency (bits per second per Hertz (bps/Hertz)) subject to a very low bit-error constraint. But a packet-oriented criterion for link adaptation seems more appropriate for practical communication networks fitted with strong error detection and a selective packet re-transmission mechanism. In recent work, we performed link optimisation for maximal bits per second or bits per Joule for data (delay-tolerant) traffic. In the present work, we extend our previous analysis to consider the case of costly power. The cost can be interpreted in the common economic sense, or can be a signal to encourage efficient resource use in a decentralised matter; furthermore, it may simply be a “Lagrange multiplier” in a centralised optimisation. When the symbol rate is flexible, the result under pricing is similar to the costless scenario: a set of possible link configurations can be ranked by the slope of a tangent line from the origin to the graph of a scaled version of the PSRF: the steeper the tangent the better the configuration. However, if the “effective price” - the power price divided by the noise-normalised channel gain - is sufficiently high, it is optimal for the terminal not to operate. If the symbol rate is fixed, the optimal configuration depends on the effective price.
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关键词
error detection,error statistics,optimisation,radiocommunication,telecommunication traffic,lagrange multiplier,psrf,bit-error constraint,centralised optimisation,cost power,data traffic,generalised link-layer adaptation,higher-layer criteria,packet-oriented criterion,selective packet re-transmission mechanism,wireless communication system,adaptive systems,throughput,resource manager,wireless communication,link layer,modulation,optimization,resource management,adaptive system,signal to noise ratio
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