Patent ID: 8305982

Claim:
A method for assigning signature sequences for Enhanced Dedicated Channel Hybrid Automatic Repeat Request Acknowledgement Indicator Channel (E-HICH), comprising: firstly, assigning a logical signature sequence index r for each User Equipment (UE); wherein the method further comprising: then, converting the logical signature sequence index r into a physical signature sequence index r′ varying with time by using a random permutation function; and after that, assigning a signature sequence corresponding to the physical signature sequence index r′ to the respective UE; wherein the random permutation function is expressed by the following equation: r′=P ( r,SFN ′), wherein SFN′ is representative of a sub-frame number in which E-HICH is in, P is representative of the random permutation function; wherein the random permutation function is implemented by: (1) initializing a permutation sequence, which comprises setting the length M of the permutation sequence as M=80, and initializing the permutation sequence to P, wherein P(0)=0, P(1)=1, . . . , P(M−1)=M−1; and then setting i=0; (2) calculating a permutation sequence P related to a system sub-frame number SFN′, which comprises: a) generating a random number k ranged from 0˜M−i; b) permuting P(i) with P(k+i); and c) i=i+1; repeating the above steps a)-c) until i=M−2.