TIMING ADVANCE CONFIGURATION FOR MULTIPLE UPLINK COMPONENT CARRIERS

摘要

The invention relates methods for time aligning uplink transmissions by a mobile terminal in a mobile communication system, and to methods for performing a handover of a mobile terminal to a target aggregation access point. The invention is also providing apparatus and system for performing these methods, and computer readable media the instructions of which cause the apparatus and system to perform the methods described herein. In order to allow for aligning the timing of uplink transmissions on uplink component carriers, where different propagation delays are imposed on the transmissions on the uplink component carriers, the inventions suggests to time align the uplink component carriers based on a reference time alignment of a reference cell and a reception time difference or propagation delay difference between the downlink transmissions in the reference cell and the other radio cells, the uplink component carriers of which need to be time aligned.

主权项

1. A method for time aligning uplink transmissions by a mobile terminal in a mobile communication system, the method comprising the steps of:
configuring the mobile terminal with a time-aligned uplink reference cell, measuring, by the mobile terminal, transmission and/or reception time difference information relating to transmissions on a target cell that is a non-time-aligned uplink target cell and/or reference cell, determining, by the mobile terminal, a first target timing advance based on at least the measured transmission and/or reception time difference information and on a reference timing advance used for uplink transmissions on the time-aligned reference cell, time-aligning, by the mobile terminal, the uplink target cell by adjusting a timing for uplink transmissions on the uplink target cell based on the determined first target timing advance, and performing a handover of the mobile terminal to the target cell based on the measurement results and/or the first target timing advance.