Patent ID: 9137765
Filing Date: 2015-09-15
Classification: H04W

Abstract:
1. A method performed by a base station for adjusting timing of uplink transmissions in a radio communication system in which aggregation of component carriers is employed, the base station being configured to receive data from a user equipment, UE, over a plurality of uplink component carriers, the method comprising: sending a first timing advance command to the UE, wherein the first timing advance command is applicable to transmissions on a first component carrier; receiving uplink transmissions from the UE, on the uplink carrier components, wherein the UE transmits uplink transmissions on the first component carrier according to the first timing advance command, and uses predetermined timings relative to the uplink transmissions on the first component carrier, for the uplink transmissions on the uplink carrier components other than the first component carrier, respectively; detecting a need to adjust the predetermined timings based on the uplink transmissions received from the UE using the predetermined timings; and sending a second timing advance command to the UE based on the detected need, wherein the second timing advance command is applicable to uplink transmissions on at least one of the first component carrier or a second component carrier among the uplink carrier components, the second timing advance command specifying an offset of uplink transmissions on the second component carrier relative to uplink transmissions on the first component carrier.