Patent ID: 9344984
Filing Date: 2016-05-17
CPC Classification: H04W

Claim Text:
1. A method used by a user device for communicating data from the user device to a network station, comprising: transmitting a synchronizing preamble having no timing advance, the synchronizing preamble comprising a base sequence that has been cyclically shifted by N shift index durations, wherein N is an integer, and the base sequence comprising a plurality of cyclic shifts, each cyclic shift including a plurality of symbols, and the base sequence including one or more other symbols that are not included in the plurality of cyclic shifts; receiving from the network station a response that indicates that the synchronizing preamble was received from the user device having the base sequence cyclically shifted by N−1 shift index durations; determining, based at least partially on the response, that corrective action is appropriate; and performing one of: