Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1998-07-30
2001-04-10
Hunter, Daniel (Department: 2684)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S422100, C455S403000, C455S428000, C455S436000, C455S560000, C455S445000
Reexamination Certificate
active
06215996
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a mobile communication system, in particular, to a CODEC system for use with a base-station controlling unit.
2. Description of the Related Art
FIG. 5
shows a digital mobile communication system according to a first example of the prior art. Here, when a mobile terminal
1
a
calls a mobile terminal
1
b
, a CODEC
41
a
of a base-station controlling unit
3
a
code-converts audio data of the mobile terminal
1
a
through a base station
2
a
into PCM audio data regardless of the attributes of, audio data of the mobile terminal
1
a
and the mobile terminal
1
b
. The base-station controlling unit
3
a
transmits the PCM audio data to a mobile-terminal switching station
5
. The mobile-terminal switching station
5
transmits the PCM audio data received from the base-station controlling unit
3
a
to a base-station controlling unit
3
b
that accommodates the mobile terminal
1
b
on the called side. A CODEC
41
b
of the base-station controlling unit
3
b
code-converts the PCM audio data received from the mobile-terminal switching station
5
into the audio data with the attributes of the mobile terminal
1
b
. The base-station controlling unit
3
b
transmits the resultant audio data to the mobile terminal
1
b
through a base station
2
b.
In this first related art reference, regardless of the attributes of audio data of the mobile terminal
1
a
on the calling side and the attributes of audio data of the mobile terminal
1
b on the called side, the base-station controlling unit
3
a
on the calling side and the base-station controlling unit
3
b
on the called side perform a code-converting process one time each (a total of two times).
Next, a second related art reference will be described. In the second related art reference, assuming that a mobile terminal transmits non-audio data such as FAX data to a terminal of the telephone network or another mobile terminal, a code-converting (CODEC) process is performed. When a mobile terminal transmits FAX data to a remote terminal, the mobile terminal on the calling side sets the communication mode to a FAX mode. However, at this point, the mobile terminal on the calling side determines whether the current mode thereof is an audio (telephone) mode or a non-audio (FAX) mode and notifies a relevant base station of the determined mode to the determined result. When the base station has received the notification that communication data is nonaudio data from the mobile terminal, the base station connects the communication data to a non-audio interface other than the audio CODEC interface so as to accomplish a non-audio communication with the terminal on the called side.
In other words, an object of the second related art reference is to simplify hardware of a base station in such a manner that a mobile terminal determines whether or not the current mode is audio data mode or non-audio data mode.
Next, the problems of the above-described related art references will be described.
In the first related art reference, when the attributes of audio data of the mobile terminal
1
a
on the calling side are the same as the attributes of audio data of the mobile terminal
1
b
on the called side, the base-station controlling unit
3
a
on the calling side code-converts audio data (with the attributes common in the mobile terminal
1
a
and the mobile terminal
1
b
) into PCM audio data. The base-station controlling unit
3
b
on the called side code-converts the PCM audio data code-converted by the base-station controlling unit
3
a
on the calling side into original audio data (with the attributes common in the mobile terminal la and the mobile terminal
1
b
).
Thus, although the attributes of audio data of the mobile terminal
1
a
on the calling side are the same as the attributes of audio data of the mobile terminal
1
b
on the called side, since the code-converting process is performed twice, the delay time of is audio data becomes large. In addition, the quality of audio data deteriorates.
The second related art reference is limited to non-audio (FAX) data communications. Further,
In the second related art reference, since a mobile terminal requires a data type determining circuit that determines whether data transmitted therefrom is audio data or non-audio data and a circuit that notifies a base station of the determined result, the additional circuitry increases the size of the mobile terminal.
SUMMARY OF THE INVENTION
An object of the present invention is to decrease the delay time of audio data being communicated between the mobile terminal
1
a
on the calling side and the mobile terminal
1
b
on the called side, to prevent the quality of audio data from deteriorating, and to accomplish such effects in a simpler call connecting sequence than before when the attributes of audio data of the mobile terminal
1
a
on the calling side are the same as the attributes of audio data of the mobile terminal
1
b
on the called side.
Another object of the present invention is to accomplish a simple method for monitoring audio data of two parties that are communicating with each other.
The present invention is a mobile communication system having a mobile-terminal switching station, a base-station controlling unit on the calling side, a base-station controlling unit on the called side, a base station, and mobile terminals, wherein the mobile-terminal switching station has a means for identifying attributes of audio data transmitted by the mobile terminal on the calling side and attributes of audio data of the mobile terminal on the called side, in the case and for prohibiting the base-station controlling unit on the calling side from transmitting a code-converting audio data when the attributes of the audio data of both mobile terminals are the same wherein the base-station controlling unit on the calling side has a means for selecting a first path of over which audio data received from the base station is output to the mobile-terminal switching station through a code-converting process or a second path of over which audio data received from the base station is output to the mobile-terminal switching station without a code-converting process, and a means for adding audio attribute information to audio data received from the base station, and wherein the base-station controlling unit on the called side has a means for identifying the audio attribute information added to the audio data received from the mobile-terminal switching station, and a means for selecting a first path over which audio data is output to the base station through a code-converting process or a second path over which audio data is output to the base station without code-converting process corresponding to the identified results.
The mobile terminal on called side has a means for identifying attributes of audio data of the mobile terminal on calling side and attributes of audio data of the mobile terminal on called side, and a means for prohibiting the base-station controlling unit on calling side from transmitting the code-converted audio data in the case that the attributes of the audio data of the mobile terminal on calling side match the attributes of the audio data of the mobile terminal on called side.
The base-station controlling unit on calling side has a means for prohibiting the base-station controlling unit on called side from transmitting the code-converted for audio data in the case that the attributes of the audio data of the mobile terminal on calling side match the attributes of the audio data of the mobile terminal on called side.
An audio monitor unit for monitoring audio data is connected to the mobile-terminal switching station, wherein the audio monitor unit has a means for identifying audio attribute information added by the base-station controlling unit to audio data being communicated between the mobile terminal on calling side and the mobile terminal on called side, and a means for determining whether or not the code-converting process for the audio data is requi
Hunter Daniel
NEC Corporation
Ostrolenk Faber Gerb & Soffen, LLP
Zewdu Meless N
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