Patent ID: 8526310
Filing Date: 2013-09-03
Classification: H04W

Abstract:
1. A method comprising: a) receiving, by a wireless device, at least one control message from a base station, said at least one control message causing in said wireless device: b) receiving, by said wireless device, an activation command to activate said secondary cell in said wireless device; c) receiving, by said wireless device, a control command configured to cause transmission of a random access preamble on random access resources of one of said at least one secondary cell in said second subset; d) receiving, by said wireless device, a random access response, said random access response comprising a timing advance command for said secondary cell group; e) transmitting, by said wireless device, one or more of said sounding reference signals on said secondary cell after applying said timing advance command to said secondary cell group, said wireless device configured to not transmit any of said sounding reference signals on said secondary cell during a period: f) dropping, by said wireless device, transmission of a sounding reference signal in said sounding reference signals in a subframe of said secondary cell when said wireless device is power limited in said subframe.