METHODS AND ARRANGEMENTS IN A WIRELESS COMMUNICATION SYSTEM

摘要

The present invention relates to methods and arrangements that enable uplink timing adjustment in a UTRAN while minimizing the signalling overhead. This is achieved by a solution where the information about the estimated reception time is used by the NB to determine whether the UEs need to be time adjusted on the UL in order to avoid TTI overlapping and thus interference. The estimated reception time of a UE UL signal is compared with an ideal reception time (the reference time) which can be defined based on the overall knowledge of the estimated reception times. If the difference between the estimated and the ideal reception time is larger than a pre-defined threshold value, meaning that the overlapping with some other UEs TTI will be big, a timing adjustment is initiated.