CPC H04W 74/0833 (2013.01) [H04J 13/0062 (2013.01); H04J 13/22 (2013.01); H04L 27/3444 (2013.01); H04W 74/006 (2013.01); H04W 74/008 (2013.01); H04W 74/08 (2013.01)] | 20 Claims |
1. A random access method, comprising:
determining, by a communications apparatus based on a preset correspondence between a set of Ncs indexes and a set of Ncs values, a target Ncs index indicating a Ncs value, wherein the Ncs value is for calculating a cyclic shift value of a root sequence and the set of Ncs values comprises {15, 18, 22, 26, 32, 38, 46, 55, 68, 82, 100, 118, 137};
sending, by the communications apparatus, signaling to a user equipment, wherein the signaling carries the target Ncs index; and
performing, by the communications apparatus, random access with the user equipment based on the root sequence and the Ncs value indicated by the target Ncs index.
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