Patent ID: 9647864
Date: 2017-05-09
CPC Classifications: H04L,H04W

Claim:
1. A method in a first device, the method comprising: communicating with a second device using a primary serving cell operating on a licensed carrier and a secondary serving cell operating on an unlicensed carrier; detecting a preamble transmission from the second device in a first set of at least one orthogonal frequency division multiplexing symbol starting with a first orthogonal frequency division multiplexing symbol in a subframe received on the secondary serving cell, the first orthogonal frequency division multiplexing symbol having a first cyclic prefix; determining a second orthogonal frequency division multiplexing symbol in the subframe such that the second orthogonal frequency division multiplexing symbol immediately follows the first set of orthogonal frequency division multiplexing symbols; and decoding downlink control information containing physical downlink shared channel resource assignment in a second set of orthogonal frequency division multiplexing symbols beginning with the second orthogonal frequency division multiplexing symbol, the second set of orthogonal frequency division multiplexing symbols having a second cyclic prefix, wherein the duration of the first cyclic prefix is larger than the duration of the second cyclic prefix.