Patent ID: 8600353
Filing Date: 2013-12-03
Classification: H04L,H04W

Abstract:
1. A method in a base station of a communication network for providing authentication related context of a Mobile Equipment (ME) of a first cell for re-establishing a Radio Resource Control (RRC) connection during an unauthenticated call from said ME, the method comprising: obtaining a Cell-Radio Network Temporary Identifier (C-RNTI) allocated for said ME from the first base station, wherein said C-RNTI identifies the ME in a Radio Resource Control (RRC) connection; obtaining a Physical Cell Identity (PCI) of the first cell, and a Cell Identity of the first cell; obtaining a Cell Identity of each of one or more potential second cells for re-establishing the RRC connection for the ME; obtaining a Message Authentication Code (MAC) algorithm; calculating, for each of the one or more potential second cells and using the obtained MAC algorithm, a MAC for data Integrity (MAC-I) based on the obtained C-RNTI of the first cell, the PCI of the first cell, the Cell Identity of the first cell, and the respective Cell Identity of the potential second cell; and transmitting, to a respective second base station for each of the one or more potential second cells, the C-RNTI for the first cell, the PCI for the first cell, and at least part of the MAC-I calculated for that potential second cell.