Patent ID: 8917622

Claim:
A method for selecting a Modulation and Coding Scheme (MCS), comprising: receiving a plurality of first packets in a first period, and calculating a Packet Error Rate (PER) according to the first packets; determining whether the PER is greater than an error rate threshold; and when the PER is greater than the error rate threshold, performing the following steps: obtaining a Carrier to Interference plus Noise Ratio (CINR) return value; performing an adjusting procedure to obtain a CINR adjustment value; calculating an actual return value according to the CINR return value and the CINR adjustment value; and selecting one of a plurality of MCSs according to the actual return value, wherein the adjusting procedure comprises: comparing a product of the PER and a reduction modification coefficient with a first adjustment value upper limit, and using the smaller one as a first adjustment value; and comparing a sum of a previous adjustment value and the first adjustment value with a second adjustment value upper limit, and using the smaller one as the CINR adjustment value.