Patent ID: 9357536
Filing Date: 2016-05-31
CPC Classification: H04J,H04W

Claim Text:
1. A method of deactivating a serving cell at a user equipment in a mobile communication system, the method comprising: receiving, by the user equipment, a message from a base station, the message allocating the serving cell to a first timing advance group (TAG); receiving, by the user equipment, an activation command for the serving cell from the base station; activating, by the user equipment, the serving cell in accordance with the activation command; receiving, by the user equipment, a first signal from the base station, the first signal indicating a TAG re-assignment of the serving cell, wherein the first signal includes an identifier of the serving cell and an identifier of a second TAG; determining, by the user equipment, whether the second TAG is identical to a special TAG pre-defined for a purpose of TAG re-assignment or not; and deactivating, by the user equipment, the serving cell, only if the second TAG is identical to the pre-defined TAG.