Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
1999-08-05
2004-06-01
Trost, William (Department: 2683)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S422100, C455S424000, C455S425000, C455S432200, C455S449000, C455S450000, C370S395200
Reexamination Certificate
active
06745049
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a mobile communication system which sets an asymmetrical data communication channel in which a transmission rate of communication data transmitted from a mobile station to a base station differs from a transmission rate of communication data transmitted from a base station to a mobile station.
BACKGROUND ART
FIG. 1
is a configuration view illustrating a conventional mobile communication system of Japanese Patent Application Laid-Open Hei 8-331153. In
FIG. 1
, reference numerals
1
,
2
,
3
and
4
designate a mobile station installed in a movable car and so on, low speed transmission means for transmitting communication data of a low transmission rate to a base station
5
, high speed reception means for receiving communication data of a high transmission rate from the base station
5
, and an up-link of a data communication channel, respectively. Reference numerals
5
,
6
,
7
and
8
designate the base station which radio communicates with the mobile station
1
belonging to a radio covered area, low speed reception means for receiving communication data of a low transmission rate from a mobile station
1
, high speed transmission means for transmitting communication data of a high transmission rate, and a down-link of the data communication line.
An operation of this mobile communication system will be described below.
For example, when the mobile station
1
need transmit communication data to a communication apparatus (not shown) connected to a public communication network, the mobile station
1
receives a control channel of the base station
5
and transmits a call through the control channel allocated to the mobile station
1
.
That is, the mobile station
1
transmits control information necessary for radio communication to the base station
5
through the control channel (for example, information to the effect that the mobile station
1
transmits communication data to the base station
5
at a low transmission rate, while the mobile station
1
receives communication data from the base station
5
at a high transmission rate).
When the control information is transmitted from the mobile station
1
, the base station
5
transfers the control information transmitted from the mobile station
1
to a mobile switching center and so on (not shown). After the mobile switching center and so on allow a request of the mobile station
1
, the base station
5
sends information to the effect that the request has been allowed to the mobile station
1
through the control channel.
Thus, the transmission rate of communication data transmitted from the mobile station
1
to the base station
5
is set to a low transmission rate, while the transmission rate of communication data transmitted from the base station
5
to the mobile station
1
is set to a high transmission rate. Therefore, asymmetrical radio communication can be achieved in which the up-link
4
differs from the down-link
8
in the transmission rate.
Since the conventional mobile communication system is formed as described above, the asymmetrical radio communication may be achieved in which the up-link
4
differs from the down-link
18
in the transmission rate. However, means for changing the transmission rate of communication data is not provided. Thus, once the transmission rate of communication data is set, even though a data amount is changed in accordance with passed time, the transmission rate cannot be changed to a transmission rate corresponding to the changed data amount. The conventional mobile communication system has the above-described problem.
The present invention has been made to solve such a problem. It is an object of the present invention to provide a mobile communication system in which after the transmission rate of communication data is set once, the transmission rate of communication data may be changed appropriately.
DISCLOSURE OF THE INVENTION
In a mobile communication system of the present invention, a mobile switching center changes a transmission rate of communication data transmitted from a mobile station to a communication apparatus in accordance with a request from the communication apparatus and so forth connected to the mobile station, a public communication network or the like.
In such way, even though a data amount of communication data transmitted from the mobile station to the communication apparatus varies after the transmission rate of communication data has been set once, the transmission rate may be appropriately changed to a transmission rate corresponding to the changed data amount.
In the mobile communication system of the invention, the mobile switching center changes a transmission rate of communication data transmitted from the communication apparatus to the mobile station in accordance with a request from the mobile station or the communication apparatus.
In such way, even though a data amount of communication data transmitted from the communication apparatus to the mobile station is fluctuated after the transmission rate of communication data has been set once, the transmission rate may be appropriately changed to a transmission rate corresponding to the changed data amount.
In the mobile communication system of the invention, the mobile switching center changes the transmission rate of communication data transmitted from the mobile station to the communication apparatus or communication data transmitted from the communication apparatus to the mobile station individually and independently in accordance with a request from the mobile station or the communication apparatus.
Thus, even though a data amount of communication data transmitted from the mobile station to the communication apparatus or from the communication apparatus to the mobile station is fluctuated after the transmission rate of communication data has been set once, the transmission rate may be appropriately changed to a transmission rate corresponding to the changed data amount.
In a mobile communication system of the invention, the transmission rate changed by the mobile switching center belongs to a range of high speed data transmission.
Thus, when the data amount is markedly large, the transmission time may be shortened.
In a mobile communication system of the invention, the transmission rate of communication data changed by the mobile switching center belongs to a range of medium speed data transmission.
Thus, radio communication corresponding to a data amount may be achieved.
In a mobile communication system of the invention, the transmission rate of communication data changed by the mobile switching center belongs to a range of low speed data transmission.
Thus, when a data amount is small, radio communication corresponding to the data amount may be achieved.
In a mobile communication system of the invention, the range of the low speed data transmission includes intermittent data transmission.
Thus, a data communication channel may be released in a period in which no communication data are transmitted.
In a mobile communication system of the invention, TDMA/TDD system, TDMA/FDD system, time-divided CDMA/TDD system, time-divided CDMA/FDD system or CDMA/TDD system is used as a transmission system of the high speed data transmission.
Thus, the high speed data transmission may be performed using the above system and so on.
In a mobile communication system of the invention, TDMA/TDD system, TDMA/FDD system, time-divided CDMA/TDD system, time-divided CDMA/FDD system or CDMA/TDD system is used as the medium speed data transmission.
Thus, the medium speed data transmission may be performed using the above system and so on.
In a mobile communication system of the invention, TDMA/TDD system, TDMA/FDD system, time-divided CDMA/TDD system, time-divided CDMA/FDD system or CDMA/TDD system is used as a transmission system of the low speed data transmission.
Thus, the low speed data transmission may be performed using the above system and so on.
In a mobile communication system of the invention, when there are a plurality of mobile stations which transmit/re
Suzuki Kuniyuki
Uchida Yoshinori
Mitsubishi Denki & Kabushiki Kaisha
Rothwell Figg Ernst & Manbeck
Trost William
Zewdu Meless
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