Patent ID: 8654624
Filing Date: 2014-02-18
Classification: H04J,H04W

Abstract:
1. A method for sequencing the Zadoff-Chu, ZC, sequences of the Random Access Channel, RACH, comprising the following steps, step 1, according to Cubic Metric, CM, of Quadrature Phase Shift Keying, QPSK, ZC sequences of the RACH are divided into a low CM group and a high CM group, to make a logical index of each ZC sequence within the low CM group smaller or larger than a logical index of each ZC sequence within the high CM group; step 2, according to a maximum cell radius or maximum cyclic shift supported by the ZC sequences under high speed circumstance, the ZC sequences within the low CM group and within the high CM group are respectively divided into S sub-groups using S−1 maximum cyclic shift thresholds, wherein S is a positive integer; and step 3, according to the CMs of the ZC sequences, the sequences are sequenced within each sub-group, to make the ZC sequences in adjacent sub-groups within the low CM group and within the high CM group have different sequencing and the ZC sequences in adjacent sub-groups between the low CM group and the high CM group have the same sequencing, wherein the last sub-group within the low CM group and the first sub-group within the high CM group are adjacent with each other while the first sub-group within the low CM group and the last sub-group within the high CM group are adjacent with each other; wherein the CMs of the ZC sequences within the low CM group are not larger than the CM of OPSK; and the CMs of the ZC sequences within the high CM group are larger than the CM of OPSK; wherein the sequences are sequenced from high to low or from low to high; wherein the logical index of the sequence within sub-group i is set smaller than the logical index of the sequences within sub-group i+1, wherein 1≦i≦S−1, the i or, wherein the logical index of the sequence within sub-group i is set smaller than the logical index of the sequence within sub-group i+1, wherein 1≦i≦S−1, the ith maximum cyclic shift threshold is Th_Ncs(i), and Th_Ncs(i)<Th_Ncs(i+1), wherein, 1≦i≦S−2 and i is a positive integer;