JP3471698B2 - Mobile communication system and mobile device used for mobile communication system - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a mobile communication system which is a wireless transmission system.

[0002]

2. Description of the Related Art Conventionally, in mobile communication systems, a single channel is provided for each base station, or a control channel and a plurality of communication channels different from each other are provided for each base station.

[0003]

However, in such a conventional mobile communication system, when a single channel is provided for each base station, call loss occurs when calls are concentrated in the area of one base station. However, there is a drawback that channels are unnecessarily vacant in other base stations.

When the base station is provided with control channels and a plurality of communication channels different from each other, the number of communication channels for each base station is adjusted to the peak of calls generated in the area of the base station. As a whole, many channels are required, and there is a drawback that usage efficiency deteriorates.

The present invention solves the above drawbacks, and an object of the present invention is to provide a mobile communication system capable of improving the use efficiency of control channels and communication channels.

[0006]

A mobile communication system of the present invention comprises a control station, a plurality of base stations connected to the control station, and a mobile station wirelessly connected to each base station. And the mobile station is capable of communicating with a control channel and a communication channel, the base station has a transmission means for transmitting a radio signal to the mobile station in a predetermined downlink time slot of the control channel, The mobile station is characterized in that it has transmission means for transmitting a calling signal to the base station in an uplink time slot immediately after receiving the radio signal.

[0007]

The mobile device of the present invention is connected to a control station, is wirelessly connected to a base station that transmits a radio signal in a predetermined downlink time slot of a control channel, and is capable of communicating on the control channel and the communication channel. And transmitting means for transmitting a calling signal to the base station in an upstream time slot immediately after receiving the radio signal.

[0009]

The mobile communication system of the present invention comprises a control station, a plurality of base stations connected to the control station, and a mobile station wirelessly connected to each base station, wherein the base station and the mobile station are:
It is possible to communicate with a control channel and a communication channel, the base station transmits a radio signal to the mobile station in a predetermined downlink time slot of the control channel, the mobile station, the reception quality of the radio signal Choose a higher base station,
A location registration signal is transmitted to the selected base station in an uplink time slot immediately after receiving the radio signal, and the selected base station transmits a registration completion signal to the mobile station in a predetermined downlink time slot of a control channel. The selected base station transmits a signal different from the radio signal to the mobile station in a predetermined downlink time slot of a control channel, and the mobile station receives an uplink immediately after receiving the signal. The call signal is transmitted to the selected base station in a time slot, the selected base station activates a free communication channel based on the call signal, and in a predetermined downlink time slot of the control channel. A response signal is transmitted to the mobile station, and the mobile station shifts to the started communication channel based on the response signal.

[0011]

[0012]

[0013]

[0014]

[0015]

As described above, the use efficiency of the control channel and the communication channel can be improved.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a mobile communication system according to an embodiment of the present invention. FIG. 2 is a block diagram of a control station and a base station of the mobile communication system of the present invention. FIG. 3 is a block diagram of a mobile station of the mobile communication system of the present invention.
1 to 3, the mobile communication system is connected to a plurality of base stations 20A to 20C that use one control channel and a plurality of communication channels and to the plurality of base stations 20A to 20C via a communication line 60. The control station 10 and the mobile stations 401 to 403 arranged in the areas 30A to 30C of the plurality of base stations 20A to 20C and capable of communicating with one control channel and a plurality of communication channels, and each of the base stations 20A to 20C. Is
As a transmission / reception means for transmitting / receiving to / from the mobile stations 401 to 403, a control channel transmission / reception section 22, a first communication channel transmission / reception section 23 to an Nth communication channel transmission / reception section 24, an antenna shared section. 25, antenna 26, transmission / reception unit 22 for control channel, transmission / reception unit 23 for first communication channel to transmission / reception unit 24 for Nth communication channel
The control station 10 includes a control unit 21 that controls each of the base stations 20A to 20C and the switch unit 12 that connects the base stations 20A to 20C and the telephone set 70 under the control of the logic unit 11. Including, the mobile stations 401 to 403 correspond to each base station 2
An antenna 41, an antenna shared unit 42, a transmitter 43, a receiver 44, as a transmitting / receiving unit for transmitting / receiving between 0A to 20C.
A handset 46 and a signal processor 45 connected to the handset 46 and controlling the transmitter 43 and the receiver 44.
The base station 20A to 20C includes a mobile station 4 as a transmitting / receiving means.
01-403 including means for sequentially transmitting idle signals to system time slots pre-allocated on the control channel, and the transmitting / receiving means of the mobile stations 401-403 uses the electric field strength of the idle signals from the base stations 20A-20C. Based on the registration signal, the transmission / reception means of each base station 20A to 20C selects the base station 20 having a strong electric field strength and transmits the registration signal via the control channel in synchronization with the idle signal. The transmitting / receiving means of the mobile stations 401 to 403 includes means for returning a registration completion signal to a pre-allocated system time slot, and the control channel pre-allocated system time is synchronized with the idle signals of the registered base stations 20A to 20C. Each of the base stations 20A to 20C includes means for transmitting a calling signal to the slot.
The transmitting / receiving means of the mobile stations 401 to 403 includes means for raising one of the vacant communication channels based on the calling signal and returning a response signal to the system time slot assigned in advance to the control channel. Means for transitioning from the control channel to the initiated communication channel based on the response signal.

Here, the feature of the present invention is that the above-mentioned pre-assigned time slots are the respective base stations 20.
That is, the numbers are equal to each other in the repetition period for A to 20C.

Further, a plurality of communication channels are provided in the base station 20A.
Commonly used at ~ 20C.

In FIG. 2, the logic unit 11 of the control station 10 is connected to the transmission / reception unit of each base station 20 through the control unit 21 of each base station 20 and the switch unit 12 by the communication line 60, and each base station is connected. 20 and various controls of the mobile station 40 through the base station 20. The control channel transmitting / receiving unit 22 is arranged in each base station 20 and has the same frequency channel. Similarly, the transmitting / receiving unit 23 for the first communication channel, the Nth
The communication channel transmitter / receiver 24 is also arranged in each base station 20 and has the same frequency channel for each channel. Control unit 21
Controls each transmission / reception unit according to an instruction from the logic unit 11, and sends monitoring information from each transmission / reception unit to the logic unit 11. The antenna sharing unit 25 is for sharing the antenna 26 among a plurality of transmitting / receiving units. The switch unit 12 configures a communication line between the mobile station 40 and the telephone set 70 via the transmission / reception unit of the base station 20, or a communication line between the mobile station 40 and another mobile station 40 via another transmission / reception unit. To do.

In FIG. 3, the antenna 41 is connected to the transmitting unit 43 and the receiving unit 44 by the antenna common unit 42. The transmitting unit 43 and the receiving unit 44 are of the synthesizer type, and are set by the signal processing unit 45 to the required frequency channel through the channel designation line 51. Handset 4
6 is connected to the transmitting unit 43 by the modulation signal line 47 via the signal processing unit 45, and the receiving unit 4 by the demodulation signal line 48.
4 is connected. In addition, the signal processing unit 45 includes
Is started by the transmission starting line 49 as required, and the input voltage of the receiving section 44 is monitored by the electric field information line 50.

The operation of the mobile communication system having such a configuration will be described. FIG. 4 is a diagram showing allocation of system time slots of a control channel to each base station of the mobile communication system of the present invention. FIG. 5 is a time chart of each signal at the time of registration of a mobile station of the mobile communication system of the present invention. FIG. 6 is a time chart of each signal when a mobile station of the mobile communication system of the present invention makes a call.

A system time slot 301 is virtually created as a mobile communication system. The base station 20A transmits the downlink signal 302 of the base station 20A from the control channel transmitting / receiving unit 22 according to an instruction from the control unit 21 to the system time slot 30.
Send according to 1. As a result, the mobile station 401 upstream slot 303 is virtually created, and the mobile station 401 selects an appropriate one of these slots when transmitting a signal.

Similarly, the base station 20B and the base station 20C
Respectively transmits the base station 20B downlink signal 304 and the base station 20C downlink signal 306. As a result, mobile station 402 upstream slot 305 and mobile station 403 upstream slot 307.
Occurs virtually.

An example of registration of mobile station 402 is shown in FIG. The mobile station 402 receives the downlink signal periodically transmitted from the base stations 20A to 20C on the control channel, and determines the base station having the highest electric field strength. In this case, it is assumed that the base station 20B has the highest electric field strength with respect to the mobile station 402.

The mobile station 402 receives the idle signal 101 transmitted on the control channel of the base station 20B and transmits the registration signal 102 in synchronization with this. The base station 20B receives the registration completion signal 10 in the system time slot assigned to itself.
3 is transmitted, and the idle signal 10 is transmitted at the next timing.
Return to 1.

Next, an example of the calling operation of the mobile station 402 is shown in FIG.
Will be described. It is assumed that the mobile station 402 is registered in the base station 20B. The mobile station 402 measures the timing of the idle signal 101 and calls out the call signal 112 in the same manner as above.
To send. The base station 20B notifies the mobile station 402 of the communication channel M (M = 1 to N) which is vacant in the entire base station by the response signal 113, and also activates the communication channel M.
The response signal 113 causes the mobile station 402 to shift from the control channel to the communication channel M.

[0028]

As described above, the present invention has an excellent effect that the use efficiency of the control channel and the communication channel can be improved.

[Brief description of drawings]

FIG. 1 is a block diagram of a mobile communication system according to an embodiment of the present invention.

FIG. 2 is a block configuration diagram of a control station and a base station of the mobile communication system of the present invention.

FIG. 3 is a block configuration diagram of a mobile station of the mobile communication system of the present invention.

FIG. 4 is a diagram showing allocation of system time slots of a control channel to each base station of the mobile communication system of the present invention.

FIG. 5 is a time chart of each signal at the time of registration of a mobile station of the mobile communication system of the present invention.

FIG. 6 is a time chart of each signal when a mobile station of the mobile communication system of the present invention makes a call.

[Explanation of symbols]

10 control station 11 logic 12 Switch part 20A, 20B, 20C base stations 21 Control unit 22 Control channel transceiver 23 Transmitter / receiver for first communication channel 24 Transceiver for Nth communication channel 25,42 Antenna common area 26,41 Antenna 30A, 30B, 30C areas 401, 402, 403 mobile stations 43 Transmitter 44 Receiver 45 Signal processing unit 46 handset 47 Modulation signal line 48 demodulation signal line 49 Transmission activation line 50 Electric field information line 51 channel designation line 60 communication line 70 telephone 101 Idle signal 102 registration signal 103 Registration complete signal 112 Calling signal 113 Response signal 301 system time slot 302 Base station 20A downlink signal 303 mobile station 401 upstream slot 304 Base station 20B downlink signal 305 Mobile station 402 Uplink slot 306 Base station 20C Downlink signal 307 mobile station 403 upstream slot

Claims (2)

(57) [Claims] 1. A control station, a plurality of base stations connected to the control station, and a mobile station wirelessly connected to each base station, wherein the base station and the mobile station use a control channel and a communication channel. Communicatable, the base station has a transmitting means for transmitting a radio signal to the mobile station in a predetermined downlink time slot of the control channel, the mobile station, after receiving the radio signal, a calling signal in the uplink time slot at a certain timing to have a transmitting means for transmitting to said base station, said base station, a communication switch vacant after the call signal received
A mobile communication system characterized by notifying the mobile device of a channel . 2. A mobile device connected to a control station, wirelessly connected to a base station for transmitting a radio signal in a predetermined downlink time slot of a control channel, and capable of communicating on the control channel with the communication channel, After receiving the radio signal, a call signal is transmitted to the base station in an uplink time slot at a fixed timing,
And then a free communication channel designated by the base station
A mobile device having a transmitting means for starting up .