Patent ID: 8902811
Filing Date: 2014-12-02
Classification: H04L,H04W

Abstract:
1. A method in a base station comprising: receiving an uplink transmission from a user equipment, said uplink transmission sent by the user equipment on a first uplink component carrier among a number of uplink component carriers aggregated for the user equipment, each uplink component carrier having an uplink transmission timing relative to a downlink timing reference; determining a timing correction for adjusting the uplink transmission timing of the first uplink component carrier, based on measuring an arrival time of the uplink transmission; determining the other uplink component carriers from among the number of uplink component carriers for which the timing correction is valid, based on determining which other uplink component carriers have the same downlink timing reference as the first uplink component carrier, or have a downlink timing reference aligned with or having a fixed offset relative to the downlink timing reference of the first uplink component carrier; and sending the timing correction and an indication of the other uplink component carriers for which the timing correction is valid to the user equipment.