JP2002101447A - Mobile communication system and mobile unit used for the mobile communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the utilizing efficiency of a control channel and a communication channel. SOLUTION: Respective base stations 20A-20C transmit various control signals by using system time slots of an identical number assigned to the base stations within a repetitive period of a control channel so as to use communication channels in common.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art Conventionally, in a mobile communication system, a single channel is provided for each base station, or a different control channel and a plurality of communication channels 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, a call loss occurs when calls are concentrated in an area of one base station. This has the disadvantage that the channels are wasted in other base stations.

When a base station is provided with a different control channel and a plurality of communication channels, the number of communication channels for each base station is adjusted to the peak of a call generated in the area of the base station. As a whole, many channels are required, and there is a disadvantage that the use efficiency is deteriorated.

An object of the present invention is to solve the above-mentioned drawbacks and to provide a mobile communication system capable of improving the use efficiency of a control channel and a communication channel.

[0006]

A mobile communication system according to the present invention comprises a plurality of base stations and a mobile station wirelessly connected to each base station, wherein the base station and the mobile station perform uplink and downlink control. Channel and a communication channel, wherein the base station has transmitting means for transmitting a downlink signal to the mobile station in a predetermined time slot of the downlink control channel, wherein the mobile station comprises the downlink signal And transmitting means for transmitting a calling signal to the base station on the uplink control channel in synchronization with the base station.

A mobile communication system according to the present invention includes a plurality of base stations and a mobile station wirelessly connected to each base station, wherein the base station and the mobile station are provided with uplink and downlink control channels and communication channels. Can communicate with the base station,
Transmitting means for transmitting a downlink signal to the mobile station in a predetermined time slot of the downlink control channel, the mobile station selects a base station with high reception quality, in synchronization with the downlink signal, A transmission unit for transmitting a location registration signal to the selected base station on an uplink control channel is provided.

A mobile station according to the present invention is wirelessly connected to a base station that transmits a downlink signal in a predetermined time slot of a downlink control channel, and is capable of communicating with the downlink control channel, the uplink control channel, and the communication channel. And transmitting means for transmitting a call signal to the base station on the uplink control channel in synchronization with the downlink signal.

Further, the mobile station of the present invention is wirelessly connected to a base station transmitting a downlink signal in a predetermined time slot of a downlink control channel, and is capable of communicating with the downlink control channel, uplink control channel and communication channel. A mobile station, comprising: a transmission unit that selects a base station having high reception quality and transmits a location registration signal to the selected base station on the uplink control channel in synchronization with the downlink signal.

A mobile communication system according to the present invention includes a plurality of base stations and a mobile station wirelessly connected to each base station. The base station and the mobile station communicate on an uplink and downlink control channel and a communication channel. It is possible, the base station transmits a downlink signal to the mobile station in a predetermined time slot of the downlink control channel, the mobile station selects a base station with high reception quality of the downlink signal, A location registration signal is transmitted to the selected base station on the uplink control channel in synchronization with the downlink signal, and the selected base station transmits a registration completion signal to the mobile station in a predetermined time slot of the downlink control channel. The selected base station transmits a signal different from the downlink signal to the mobile station in a predetermined time slot of a downlink control channel, and the mobile station transmits Transmitting a call signal to the base station on an uplink control channel, the selected base station starts up a vacant communication channel based on the call signal, and determines a predetermined time slot of a downlink control channel. And transmitting a response signal to the mobile station, and the mobile station shifts to the established communication channel based on the response signal.

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

[0012]

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 according to the present invention. FIG. 3 is a block diagram of a mobile station of the mobile communication system according to the present invention.
1 to 3, the mobile communication system is connected to a plurality of base stations 20A to 20C using one control channel and a plurality of communication channels, and is connected to the plurality of base stations 20A to 20C via a communication line 60. Control station 10 and mobile stations 401 to 403 arranged in areas 30A to 30C of a plurality of base stations 20A to 20C and capable of communicating with one control channel and a plurality of communication channels. Is
Control channel transmitting / receiving unit 22, transmitting / receiving various control signals, transmitting / receiving unit for first communication channel 23 to transmitting / receiving unit for Nth communication channel, transmitting / receiving unit for transmitting and receiving various control signals to / from mobile stations 401 to 403, antenna sharing unit 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 logic unit 11 that controls each control unit 21 and a switch unit 12 that connects each of the base stations 20A to 20C and the telephone 70 under the control of the logic unit 11. The mobile stations 401 to 403 include each base station 2
The antenna 41, the antenna common unit 42, the transmitting unit 43, the receiving unit 44 as transmitting and receiving means for transmitting and receiving between 0A to 20C,
A handset 46 and a signal processing unit 45 connected to the handset 46 for controlling the transmitting unit 43 and the receiving unit 44
And the transmitting / receiving means of each of the base stations 20A to 20C is a mobile station 4
Means for transmitting idle signals in sequence to system time slots allocated to control channels 01 to 403 in advance, and the transmitting and receiving means of the mobile stations 401 to 403 determine the electric field strength of the idle signal from each of the base stations 20A to 20C. The base station 20 includes a unit that selects a base station 20 having a strong electric field strength based on the registration signal and transmits a registration signal via a control channel in synchronization with the idle signal. Means for returning a registration completion signal to a pre-allocated system time slot, wherein the transmitting and receiving means of the mobile stations 401 to 403 transmit and receive the pre-allocated system time of the control channel in synchronization with the idle signals of the registered base stations 20A to 20C. Means for transmitting a calling signal in the slot, each base station 20A-20C
Means for starting up one of the vacant communication channels based on the calling signal and returning a response signal to a pre-assigned system time slot of the control channel, and the transmitting and receiving means of the mobile stations 401 to 403 Means for shifting from the control channel to the established communication channel based on the response signal.

Here, a feature of the present invention is that the pre-allocated time slots are stored in each base station 20.
A to 20C are equal to each other within the repetition period.

Further, the plurality of communication channels are connected to the base station 20A.
Commonly used in ~ 20C.

In FIG. 2, a logic section 11 of the control station 10 is connected to a transmission / reception section of each base station 20 via a control section 21 and a switch section 12 of each base station 20 via a communication line 60. 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 first communication channel transmitting / receiving unit 23,
The communication channel transmitting / receiving unit 24 is also arranged in each base station 20 and has the same frequency channel for each channel. Control unit 21
Controls the transmission / reception units according to instructions from the logic unit 11 and sends monitoring information from the transmission / reception units to the logic unit 11. The antenna sharing unit 25 is for sharing the antenna 26 with a plurality of transmitting / receiving units. The switch unit 12 forms a communication line between the mobile station 40 and the telephone 70 via the transmission / reception unit of the base station 20 or forms a communication line between the mobile station 40 and another mobile station 40 via another transmission / reception unit. I do.

In FIG. 3, an antenna 41 is connected to a transmitting unit 43 and a receiving unit 44 by an antenna common unit 42. The transmitting unit 43 and the receiving unit 44 are of a synthesizer type, and the signal processing unit 45 sets a required frequency channel through a channel designation line 51. Handset 4
Numeral 6 is connected to the transmitting unit 43 via a modulation signal line 47 via a signal processing unit 45, and to the receiving unit 4 via a demodulation signal line 48.
4 is connected. In addition, the signal processing unit 45
Is started by the transmission start line 49 as necessary, and the input voltage of the receiving unit 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 the allocation of a system time slot of a control channel to each base station of the mobile communication system according to the present invention. FIG. 5 is a time chart of each signal when the mobile station of the mobile communication system of the present invention is registered. FIG. 6 is a time chart of each signal when a mobile station of the mobile communication system according to 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 base station 20A downlink signal 302 from the control channel transmitting / receiving section 22 in accordance with an instruction from the control section 21 to the system time slot 30.
Send in line with 1. As a result, the mobile station 401 uplink slot 303 is virtually created, and the mobile station 401 selects an appropriate one of the slots when transmitting a signal.

Similarly, base station 20B and base station 20C
Transmits a base station 20B downlink signal 304 and a base station 20C downlink signal 306, respectively. Thereby, mobile station 402 uplink slot 305 and mobile station 403 uplink slot 307
Occurs virtually.

FIG. 5 shows an example of registration of the mobile station 402. The mobile station 402 receives a downlink signal transmitted periodically from each of the base stations 20A to 20C via a control channel, and determines a 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 for 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 a registration signal 102 in synchronization with the idle signal 101. The base station 20B receives the registration completion signal 10 in the system time slot assigned to itself.
3 and transmits the idle signal 10 at the next timing.
Return to 1.

Next, an example of a calling operation of the mobile station 402 is shown in FIG.
This will be described below. It is assumed that mobile station 402 is registered with base station 20B. The mobile station 402 measures the timing of the idle signal 101 and calls the
Send The base station 20B notifies the mobile station 402 of a vacant communication channel M (M = 1 to N) in the entire base station with a response signal 113, and starts up the communication channel M.
The response signal 113 causes the mobile station 402 to shift from the control channel to the communication channel M.

[0023]

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 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 according to the present invention.

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

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

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

[Explanation of symbols]

 Reference Signs List 10 control station 11 logic section 12 switch section 20A, 20B, 20C base station 21 control section 22 control channel transmission / reception section 23 first communication channel transmission / reception section 24 Nth communication channel transmission / reception section 25,42 antenna common use section 26,41 Antennas 30A, 30B, 30C Areas 401, 402, 403 Mobile station 43 Transmitting unit 44 Receiving unit 45 Signal processing unit 46 Handset 47 Modulation signal line 48 Demodulation signal line 49 Transmission start 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 Call signal 113 Response signal 301 System time slot 302 Base station 20A Down signal 303 Mobile station 401 Up slot 304 Base station 20B Down signal 305 Mobile station 402 Up slot 306 Base station 20CRi signals 307 the mobile station 403 an uplink slot

Claims (5)

[Claims] 1. A mobile station comprising: a plurality of base stations; and a mobile station wirelessly connected to each of the base stations, wherein the base station and the mobile station are capable of communicating with uplink and downlink control channels and communication channels. The station has transmitting means for transmitting a downlink signal to the mobile station in a predetermined time slot of the downlink control channel, wherein the mobile station synchronizes with the downlink signal and transmits a call signal on the uplink control channel. Mobile communication system, comprising: a transmitting unit that transmits a signal to the base station. 2. A base station comprising: a plurality of base stations; and a mobile station wirelessly connected to each base station, wherein the base station and the mobile station are capable of communicating with uplink and downlink control channels and communication channels. The station has transmitting means for transmitting a downlink signal to the mobile station in a predetermined time slot of the downlink control channel, wherein the mobile station selects a base station having high reception quality and synchronizes with the downlink signal. And transmitting means for transmitting a location registration signal to the selected base station on the uplink control channel. 3. A mobile station wirelessly connected to a base station transmitting a downlink signal in a predetermined time slot of a downlink control channel and capable of communicating on the downlink control channel, the uplink control channel, and the communication channel, A mobile station comprising transmitting means for transmitting a calling signal to the base station on the uplink control channel in synchronization with a downlink signal. 4. A mobile station wirelessly connected to a base station transmitting a downlink signal in a predetermined time slot of a downlink control channel and capable of communicating on the downlink control channel, the uplink control channel, and the communication channel. A mobile station, comprising: transmission means for selecting a high quality base station and transmitting a location registration signal to the selected base station on the uplink control channel in synchronization with the downlink signal. 5. A base station comprising: a plurality of base stations; and a mobile station wirelessly connected to each of the base stations, wherein the base station and the mobile station can communicate on uplink and downlink control channels and communication channels. The station transmits a downlink signal to the mobile station in a predetermined time slot of the downlink control channel, the mobile station selects a base station having high reception quality of the downlink signal, and synchronizes with the downlink signal. Transmitting a location registration signal to the selected base station on the uplink control channel, the selected base station transmits a registration completion signal to the mobile station in a predetermined time slot of a downlink control channel, The base station transmits a signal different from the downlink signal to the mobile station in a predetermined time slot of a downlink control channel, and the mobile station transmits an uplink control channel in synchronization with the signal. A call signal to the base station, and the selected base station starts up a vacant communication channel based on the call signal, and sets the mobile station in a predetermined time slot of a downlink control channel. A mobile communication system, wherein the mobile station shifts to the established communication channel based on the response signal.