Patent ID: 8717908
Filing Date: 2014-05-06
Classification: H04L,H04W

Abstract:
1. A method in a user equipment for selecting component carriers for random access attempts, wherein the user equipment is arranged to communicate with a base station over multiple component carriers, the method comprising: selecting a component carrier from the multiple component carriers, based on a selection likelihood for the selected component carrier; transmitting a random access attempt to the base station over the selected component carrier; maintaining statistics of component carriers selected for random access attempts per component carrier of the multiple component carriers; and adjusting a likelihood of selecting a specific component carrier for a subsequent transmission of a random access attempt based on the maintained statistics; wherein said adjusting is performed by adjusting the likelihood of selecting the specific component carrier for subsequent transmissions of random access attempts by reducing the likelihood of selecting the specific component carrier when a number of unsuccessful transmitted random access attempts for the specific component carrier comprised in the maintained statistics exceeds a predetermined number N, and wherein said adjusting further comprises readjusting the likelihood of selecting the specific component carrier for subsequent transmissions of random access attempts by increasing the likelihood of selecting specific component carrier when a number of unsuccessful transmitted random access attempts for other component carriers than the specific component carrier comprised in the maintained statistics exceeds a predetermined number P, performed after the adjustment.