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The land mobile communication is affected by fading when the mobile station moves in the multipath transmission environment. On the other hand, there are cases where there is no fluting as in the communication with the standing or transported mobile station. It has been understood that the coherent detection using PLL is better in the nonfading environment sad the differential detection is better in the fading environment. From such a viewpoint, this paper proposes s detector diversity system for mobile communication which can cope with the complicated states of the transmission path by switching between the coherent detection (PLL) sad the differential detection using the error-detection code. The proposed system uses a simple error-detection code, and the two detectors are switched by selecting the detector with a fewer number of detected errors. The feature of the system is that it is simple, being constructed by the existing PLL and the differential detector. The effectiveness of the proposed system is verified by computer simulation. [ABSTRACT FROM AUTHOR]

The intelligent network (IN) is expected to play an important role in rapidly and efficiently introducing new telecommunication services. This paper discusses the abstraction and control methods for constructing a service control environment in the intelligent network which does not depend on specific service. By using this method, a real he, work configuration is abstracted into several patterns, considering the control points required by each service specification and each pattern can be described as a combination of functional virtualized resources. It is made possible to handle the diversified service specifications in a unified way which is independent of detailed conditions of the transport network. It is made possible also to ensure the service independency of the control interface specifying the interface by control of each virtualized resources. Moreover, a model for the call control is proposed and the function assignment in introducing IN into existing network is discussed. [ABSTRACT FROM AUTHOR]