Patent ID: 8914017
Filing Date: 2014-12-16
Classification: H04W,Y02D

Abstract:
1. A mobile communication device for handling random access failures in a multi-carrier system, comprising: a wireless module, performing wireless transceiving to and from a cellular station; and a controller module, performing operations of a Media Access Control (MAC) layer belonging to a communication protocol of a Long Term Evolution (LTE) technology or an LTE-Advanced technology, wherein the operations comprises: retrying a random access procedure on a carrier frequency with the cellular station via the wireless module, stopping the retry of the random access procedure in response to the retry of the random access procedure being failed or receiving a message from the cellular station via the wireless module, discarding radio resources associated with the random access procedure, which are indicated by explicitly signaled parameters “ra-Preamblelndex” and “ra-PRACH-MaskIndex” of the MAC layer in response to stopping the retry of the random access procedure, and initiating another random access procedure on another carrier frequency with the cellular station via the wireless module, and wherein, before stopping the retry of the random access procedure, the random access procedure has been retried for a predetermined number of times or for a predetermined period of time and still failed.