Method for link adaptation
First Claim
1. A link adaptation method for a transmission of data from a sender to a receiver through a communication channel to a variation of a transmission condition of said communication channel, comprising the steps of ascertaining at least one current value of at least a first quantity indicative of said transmission condition, comparing said current value with a first target value of said first quantity, modifying the ratio between said first target value and said current value of said first quantity in dependence on the result of said comparing step, and selecting a modulation and coding scheme for said data transmission from a predetermined number of modulation and coding schemes in dependence on the result of said comparing step and on the result of said modifying step.
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Abstract
According to the invention a method is provided for a link adaptation for a transmission of data from a sender to a receiver through a communication channel to a variation of a transmission condition of said communication channel. The method comprises the steps of ascertaining at least one current value of at least a first quantity indicative of said transmission condition, comparing said current value with a first target value of said first quantity, modifying the ratio between said first target value and said current value of said first quantity in dependence on the result of said comparing step, and selecting a modulation and coding scheme for said data transmission from a predetermined number of modulation and coding schemes in dependence on the result of said comparing step and on the result of said modifying step. According to the method of the invention, in addition to an inner loop adaptation of the MCS a further adaptation of the first target value is performed. That is, there is a second, outer loop control mechanism for an ongoing transmission. This way, a better link adaptation may be obtained.
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Citations
32 Claims
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1. A link adaptation method for a transmission of data from a sender to a receiver through a communication channel to a variation of a transmission condition of said communication channel, comprising the steps of
ascertaining at least one current value of at least a first quantity indicative of said transmission condition, comparing said current value with a first target value of said first quantity, modifying the ratio between said first target value and said current value of said first quantity in dependence on the result of said comparing step, and selecting a modulation and coding scheme for said data transmission from a predetermined number of modulation and coding schemes in dependence on the result of said comparing step and on the result of said modifying step.
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25. Network node, comprising
a measurement unit, adapted to ascertain at least one current value of at least a first quantity indicative of a transmission condition of a communication channel for an ongoing data transmission between said network node and a second network node, and to provide at least one first signal indicative of said current value, a first target memory comprising at least one first target value of said first quantity, a comparing unit, communicating with said measurement unit and said target memory, and adapted to perform at least one step of comparing said first signal with said first target value and to provide a second signal indicative of the result of said comparison step, a transmission control unit communicating with said comparing unit and adapted to set at least one transmission parameter in dependence on said second signal, wherein said transmission control unit is further adapted to set said first target value in dependence on a second target value of a second quantity that is dependent on a success rate for said data transmission.
Specification