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The TETRA system provides an authentication service which permits only the authorized terminal to access its network by verifying that the terminal equipment and the authentication center have the identical authentication key using challenge-response protocol. However, while TETRA standard authentication protocol is able to block cloned terminals that have cloned a terminal identifier called Individual...
To realize the voice privacy between CDMA mobile phone and TSTN terminal, the voice frames shall be transmitted transparently between the heterogeneous networks. For satisfying this requirement, we propose the method which transmits voice frames by the CDMA circuit data channel in real time. In this paper we analyze the causes of voice delay which occurs during voice transmission by circuit data channel,...
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