| CPC H04L 5/0048 (2013.01) [H04L 25/0202 (2013.01); H04L 27/10 (2013.01)] | 22 Claims |

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1. A method comprising:
receiving, by an apparatus from a network device, a first signaling indicating a length K sequence;
transmitting, by the apparatus to the network device a reference signal;
wherein the reference signal is obtained from the length K sequence, and the length K sequence is obtained by a cyclicly repeated length p ZC sequence,
where
p is a prime number,
p is larger than K/3,
a largest prime number that is smaller than K is greater than p, and
p is smaller than the largest prime number that is smaller than K.
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