Telephonic communications – Audio message storage – retrieval – or synthesis
Patent
1992-06-17
1994-03-01
Ng, Jin F.
Telephonic communications
Audio message storage, retrieval, or synthesis
379 59, 455 332, H04M 1100
Patent
active
052915441
ABSTRACT:
When a mobile telephone being served by a cellular mobile radio domain served by a first switching exchange equipped for mobile radio communication through base stations for the respective calls moves over to another mobile radio domain similarly served by a second switching exchange, some additional connection and disconnection procedure is provided to avoid keeping the first switching exchange in the call path in order to continue the control of the call after a after a so-called handover procedure has put the mobile telephone into communication with the second switching exchange and therethrough with the first switching exchange. The additional steps involve establishing a direct connection between the second switching exchange equipped communication with mobile units and an exchange equipped for fixed point-to-point telecommunication through which the call passes. Thereafter, call control goes to the second switching exchange for mobile service, followed by disconnection of the first switching exchange from the call path, making it available for other calls.
REFERENCES:
patent: 4856048 (1989-08-01), Yamamoto et al.
Article: Electrical Communication, "Cellular Mobile Radio as an Intelligent Network Application", Ballard et al., vol. 63, No. 4, 1989, pp. 389-399.
Article: Electrical Communication, "System 900: The ISDN Approach to Cellular Mobile Radio", Weib et al., vol. 63, No. 4, 1989, pp. 400-408.
Global Telecommunications Conference, Nov. 15-18, 1987, vol. 3, Tokyo, A. Nakajima et al.--"Enlarging Technologies . . . ".
36th IEEE Vehicular Technology Conference, May 20-22, 1986, G. D. Culp, "Cellular Intersystem Handoff:".
Proceedings of the International Switching Symposium, May, 1984, T. Goto et al., "Nation-Wide Automobile . . . ".
Bost Dwayne D.
Koninklijke PTT Nederland N.V.
Ng Jin F.
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