Telecommunications – Radiotelephone system
Reexamination Certificate
1999-04-21
2001-06-12
Banks-Harold, Marsha D. (Department: 2682)
Telecommunications
Radiotelephone system
C455S560000
Reexamination Certificate
active
06246869
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a mobile transmission system having a voice processing device.
2. Description of the Related Art
In a conventional mobile transmission system, since data volume is tremendously increased if usual voice signals used in public telephone lines are used, as they are, in a wireless range, a voice processing device is employed to convert voice signals to coded voice signals in order to compress the data volume, wherein wireless transmission is carried out.
FIG. 1
is a block diagram of a conventional mobile transmission system.
As shown in
FIG. 1
, the conventional mobile transmission system mainly consists of an exchange controlling station
11
, wireless controlling stations
12
, voice processing devices
13
, and base stations
14
. The exchange controlling station
11
mutually connects a plurality of wireless controlling stations
12
to the main network
15
of public telephone lines. Furthermore, the wireless controlling station
12
controls wireless channels of the base stations
14
.
In the conventional mobile transmission system, the voice processing devices
13
are connected to the wireless controlling stations
12
, wherein voice signals are converted by controlling the wireless controlling stations
12
.
Herein, in line with the recent popularization of mobile transmission and progress of mobile transmission technologies, requests for a new control occur in the mobile transmission system. As one of the requests, a voice processing device is connected to the exchange controlling station, wherein it is considered that, by causing the exchange controlling station to control the voice processing devices, voice processing devices which are, respectively, connected to a plurality of wireless controlling stations are collected at one point, in order to increase efficiency of voice processing.
However, in the existing mobile transmission system, if voice processing devices also are connected to the exchange controlling station, the voice processing devices at the wireless controlling station side will be made useless. Furthermore, once the voice processing devices at the wireless controlling station side are disused, they will be no longer used in a case where the voice processing devices are desired to be utilized at the wireless controlling station side due to changes in the transmission system in the future.
SUMMARY OF THE INVENTION
It is therefore an object of the invention to provide a mobile transmission system which is able to prevent investment of facilities from overlapping and to flexibly match changes thereof in the future.
The above object can be achieved by connecting voice processing devices to both an exchange controlling station and wireless controlling station by independent data lines, and by controlling the voice processing devices from either the exchange controlling station or the wireless controlling stations by bus-type control line.
REFERENCES:
patent: 5950134 (1999-09-01), Agrawal et al.
patent: 0727888 (1996-08-01), None
patent: 9-051569 (1997-02-01), None
patent: 97/16043 (1997-05-01), None
patent: 97/29566 (1997-08-01), None
Masami Yabusaki et al., “Voice Communication Connection Control in Digital Public Land Mobile Networks”.
IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, JP, Institute of Electronics Information and Comm. Eng. Tokyo, Vol. E75-A, No. 12, XP000339157, published on Dec. 1, 1992, pp. 1702-1709.
English Language Abstract of -JP-9-051569.
Banks-Harold Marsha D.
Greenblum & Bernstein P.L.C.
Matsushita Electric Industrial Co. Ltd
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