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It is expected that, in the near future, Portable Communications Systems (PCSs) will provide wireless access to the wireline telephone network for a large number of telephone calls. PCSs transmit conversations via radio, making them more susceptible to eavesdropping than are conversations carried via wires. The mobility of PCS users also presents new problems relating to 1) authentication-ensuring service is not obtained fraudulently, and 2) the privacy of information about the PCS user's location. It is important that PCS provide privacy (of conversation and location) and fraud control comparable to that of the wireline network. This paper presents and discusses technical options for accomplishing these goals in light of concerns about implementation complexity. 54.5.1

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