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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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Recent advances in technology are making possible the development of light-weight, low-power, inexpensive portable digital radio telephones. It is desirable to allow people to originate and receive calls virtually anywhere using such a pocket-sized portable telephone. In order to provide this capability efficiently (and therefore at low-cost) it is envisioned that the infrastructure of the local exchange networks will be used to provide portable telephone service. The application of the local exchange network is complicated by the fact that portable telephones travel from place to place with their owners. In this paper, we point out some of the problems associated with delivering voice calls to portable telephones away from their home (the service area where the user initially subscribed), and describe how the local exchange networks, with their Intelligent Network capabilities, can be used to solve these problems. 30.3.5. 0952r supply the network with her personal identification number via the telephone keypad.ACP can be implemented in the switching system, in the Controller (augmented by a switching fabric), or using the AIN features of an AlN-capable switching system. . ConclusionThe efficient delivery of calls to portable telephones away from home requires substantial use of the capabilities of the wireline telephone network. The necessary functions of registration, routing, alerting, and pickup can be implemented by making use of dedicated PCS equipment, while capitalizing on the utility of: (1) the switching fabric and generic switching features of the central office switching system, (2) the Common Channel Signalling network with the SS7 protocol, and (3) existing and emerging Intelligent Network capabilities.