Patent ID: 9374837
Filing Date: 2016-06-21
CPC Classification: H04L,H04W

Claim Text:
1. A mobile station configured to prevent misuse of a random access procedure, the mobile station comprising: a transceiver coupled to a controller, the controller configured to cause the transceiver to transmit and receive, a random access response received by the mobile station is scrambled using an identity of a random access preamble transmitted by the mobile station; the controller further configured to check that the random access response is in response to the random access preamble transmitted by the mobile station and to decode the random access response, wherein the controller is configured to check by de-scrambling a verification code to obtain a de-scrambled verification code, wherein the verification code corresponds to the random access response, and by determining that the descrambled verification code is correct, wherein the controller is configured to determine that the de-scrambled verification code is correct by de-scrambling the random access response to obtain the descrambled random access response, computing a function of the de-scrambled random access response, and determining that the de-scrambled verification code is equal to the computed function of the de-scrambled random access response, and wherein the random access response is descrambled to obtain the descrambled random access response by applying an exclusive-or operation between a bit sequence representing the random access response and a bit sequence constructed by repeated concatenation of a bit sequence representing the identity of the random access preamble.