Call forwarding in a mobile communication system

Telecommunications – Radiotelephone system – Zoned or cellular telephone system

Patent

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Details

455414, 455436, 379211, H04Q 720, H04Q 722

Patent

active

058677844

ABSTRACT:
A digital cellular communication system supports call forwarding with better speech quality by avoiding unnecessary speech decoding when a call is forwarded from one network or exchange to another. A new information element that contains the network code of an originating mobile services switching center (MSC) is added in an initial address message, so that the address of the originating MSC can be properly determined by a terminating MSC or, if call forwarding has been initiated, by a forwarded-to MSC. A structured dialog is used for sending a speech coding request to the originating MSC in which a return result signal acknowledging the request is sent to the correct receiver in the terminating MSC or, if call forwarding has been initiated, in the forwarded-to MSC.

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CCITT "Blue Book", Fascicle VI.11, Digital Subscriber Signalling System No. 1 (DSS1), Network Layer, User-Network Management, pp. vii-ix, 3-8, 15, 16, 23, 30, 31, 46, 47, 67-75, 112, 116, 151, 365-378.
Syuji Yasuda et al., "Network Functions for the Application of Multi-rate Speech Coding in Digital Cellular Systems", IEEE Proceedings of the Vehicular Technology Conference, Stockholm, vol. 1, pp. 306-310 (Jun. 8, 1994).

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