Patent ID: 8738913
Filing Date: 2014-05-27
Classification: H04L,H04W

Abstract:
1. A method of deriving a traffic encryption key (TEK), the method comprising: obtaining, by a mobile station (MS) from a serving base station (SBS), a nonce for deriving a TEK; transmitting, by the MS to the SBS, a handover request message; receiving, by the MS from the SBS, a handover response message comprising a target base station identifier (TBS ID); obtaining, by the MS, a pair-wise master key (PMK) during an authentication procedure with a target base station (TBS), wherein the PMK is derived from a master session key (MSK); deriving, by the MS, an authentication key (AK) using the PMK, a medium access control (MAC) address of the MS and the TBS ID; transmitting, by the SBS to the TBS, the nonce for deriving a new TEK at the TBS; performing, by the MS, a 3-way handshake procedure with the TBS after the authentication procedure is completed; deriving, by the MS, the new TEK using the AK, a TEK counter, the nonce and a security association identifier (SAID) before a handover procedure is completed; and deriving, by the TBS, the new TEK using the AK and the nonce, wherein the AK is generated during the authentication procedure.