Embodiments of the present invention disclose a method, user equipment, base station, and system for detecting sharing of a timing advance value, relate to the field of communications technologies, and solve a problem in the prior art that a normal service cannot be provided because a TA value cannot be shared between different uplink CCs. 1 to 20% by weight of expanded perlite,0. The wireless communication device further registers to the initial wireless communication network. The waterproof case also comprises a window through which the screen of the player can be viewed, and a flexible pad for operating the player while it is in the waterproof case. Hence the acronym CONGO, stands for Charge ON the GO.