JPH04282923A - Mobile communication system - Google Patents

Abstract

PURPOSE:To improve the operating efficiency of a channel by sending a control signal through a number of system time slots allocated in advance corresponding to number of registered mobile stations by each base station and using plural communication channels in common. CONSTITUTION:A base station 20A sends a base station 20A outdoing signal 302 from a control channel transmission reception section through a system time slot 301. Thus, a mobile station 401 incoming slot 303 is formed virtually and the mobile station 401 selects a proper slot and sends a signal. Moreover, base stations 20B, 20C, send a base station 20B outgoing signal 304 and a base station 20C outgoing signal 306 and generate a mobile station 402 incoming slot 305 and a mobile station 403 incoming slot 307 virtually. The base stations 20A-20C send a control signal through slots assigned in advance corresponding to number of registered mobile stations 40 and use plural communication channels in common to improve the operating efficiency of the channel.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention is utilized in a mobile communication system using a wireless transmission system.

0002

2. Description of the Related Art Conventionally, in mobile communication systems, each base station has been provided with a single channel, or each base station has been provided with a mutually different control channel and a plurality of communication channels.

0003

[Problems to be Solved by the Invention] However, in such conventional mobile communication systems, when a single channel is provided for each base station, call loss occurs when calls are concentrated in the area of one base station. There was a disadvantage that channels were wasted at other base stations.

[0004] Furthermore, when a base station is provided with mutually different control channels and a plurality of communication channels, the number of communication channels for each base station must be matched to the peak of calls occurring in the area of that base station. In total, a large number of channels are required, resulting in poor usage efficiency.

[0005] The present invention solves the above-mentioned drawbacks, and aims to provide a mobile communication system that can improve the efficiency of using control channels and communication channels.

[0006]

[Means for Solving the Problems] The present invention provides a plurality of base stations that utilize one control channel and a plurality of communication channels, one control station connected to the plurality of base stations,
a mobile station that is located within the area of the plurality of base stations and is capable of communicating through the one control channel and the plurality of communication channels; The transmitting/receiving means of the mobile station includes means for sequentially transmitting idle signals in the allocated system time slots, and the transmitting/receiving means of the mobile station selects a base station with a strong electric field strength based on the electric field strength of the idle signal from each base station, and transmits the idle signal from the base station. and means for transmitting a registration signal to the control channel in synchronization with the control channel, and the transmitting/receiving means of each base station returns the registration completion signal in a pre-allocated system time slot of the control channel based on the registration signal. The transmitting/receiving means of the mobile station includes means for transmitting a calling signal to the control channel in synchronization with the idle signal of the registered base station, and the transmitting/receiving means of each base station transmits a calling signal based on the calling signal. and means for starting up one of the vacant communication channels and returning a response signal to a pre-assigned system time slot of the control channel, wherein the transmitting/receiving means of the mobile station transmits the response signal from the control channel based on the response signal. The mobile communication system including means for transitioning to the established communication channel is characterized in that the pre-assigned system time slots are of a different number within the repetition period for each base station.

Further, in the present invention, it is preferable that the number of system time slots of the control channel allocated in advance to each of the base stations corresponds to the number of mobile stations registered with each of the base stations.

Furthermore, according to the present invention, a plurality of communication channels can be used in common by the plurality of base stations.

[0009]

[Operation] Each base station transmits various control signals to the mobile station using a different number of system time slots that are pre-allocated within the repetition period of the control channel.

[0010] Furthermore, it is desirable that the number of system time slots allocated in advance to each base station correspond to the number of mobile stations registered with each base station.

Furthermore, it is desirable that a plurality of communication channels be used in common by the plurality of base stations.

[0012] As described above, it is possible to improve the usage efficiency of control channels and communication channels.

[0013]

Embodiments Examples 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 the control station and 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. Figures 1 to 3
In the mobile communication system, a plurality of base stations 20A to 20A using one control channel and a plurality of communication channels are used.
20C, a control station 10 connected to the plurality of base stations 20A to 20C via a communication line 60, and one control channel and a plurality of communications arranged within the areas 30A to 30C of the plurality of base stations 20A to 20C. Each base station 20A to 20C includes a control channel transmitting/receiving unit 22 that transmits and receives various control signals as a transmitting/receiving means for transmitting and receiving between the mobile stations 401 to 403. , first communication channel transmitting/receiving section 23 to Nth communication channel transmitting/receiving section 24,
Antenna common unit 25, antenna 26, control channel transmitting/receiving unit 22, and first communication channel transmitting/receiving unit 23-
Control unit 21 that controls the Nth communication channel transmitter/receiver 24
The control station 10 includes a logic unit 11 that controls each control unit 21, and each base station 20A to 2 under the control of the logic unit 11.
The mobile stations 401 to 403 each include a switch unit 12 that connects the mobile stations 20A to 403 to the base stations 20A to 403.
20C, an antenna 41, an antenna common unit 42, a transmitting unit 43, a receiving unit 44, a handset 46, and a signal processing unit 45 connected to the handset 46 and controlling the transmitting unit 43 and the receiving unit 44. The transmitting/receiving means of each base station 20A to 20C includes means for sequentially transmitting an idle signal to the mobile stations 401 to 403 in pre-allocated system time slots of the control channel,
The transmitting/receiving means is based on the electric field strength of the idle signal from each base station 20A to 20C.
and transmits a registration signal via the control channel in synchronization with the idle signal of each base station 20A.
The transmitting/receiving means of ~20C includes means for returning a registration completion signal to a pre-allocated system time slot of the control channel based on the registration signal, and the transmitting/receiving means of mobile station 401
~403 The transmitting/receiving means is the registered base station 20A ~2
The transmitting/receiving means of each base station 20A to 20C includes means for transmitting a calling signal in a pre-assigned system time slot of the control channel in synchronization with the idle signal of The transmitting/receiving means of the mobile stations 401 to 403 include means for starting up one communication channel and returning a response signal to a pre-assigned system time slot of the control channel, and the transmitting/receiving means of the mobile stations 401 to 403 transfer the communication channel from the control channel to the started communication channel based on the response signal. including the means to migrate.

The feature of the present invention is that the pre-allocated time slots are
A to 20C are different numbers within the repetition period.

[0015] Furthermore, the number of system time slots of the control channel allocated in advance to each base station 20A to 20C corresponds to the number of mobile stations 40 registered in each base station 20A to 20C.

Furthermore, a plurality of communication channels are connected to base station 20.
Commonly used in A to 20C.

In FIG. 2, the logic section 11 of the control station 10 is connected to the transmitter/receiver section of each base station 20 via the control section 21 and switch section 12 of each base station 20 by a communication line 60, and each base station 20 and various controls of the mobile station 40 through the base station 20. The control channel transmitter/receiver 22 is arranged in each base station 20 and has the same frequency channel. Similarly, the first communication channel transmitter/receiver 23,
A 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 transmitter/receiver according to instructions from the logic unit 11, and sends monitoring information from each transmitter/receiver to the logic unit 11. The antenna common unit 25 is for sharing the antenna 26 with a plurality of transmitting and receiving units. The switch section 12 configures a communication line between the mobile station 40 and the telephone 70 via the transmitter/receiver section of the base station 20, or configures a communication line between the mobile station 40 and other mobile stations 40 via another transmitter/receiver section. do.

In FIG. 3, an antenna 41 is connected to a transmitting section 43 and a receiving section 44 through an antenna common section 42. As shown in FIG. The transmitting section 43 and the receiving section 44 are of a synthesizer type, and a necessary frequency channel is set by the signal processing section 45 through the channel designation line 51. handset 4
6 is connected to the transmitting section 43 via a modulating signal line 47 via a signal processing section 45, and is connected to the receiving section 4 via a demodulating signal line 48.
Connected to 4. In addition, the signal processing section 45 is a transmitting section 43
is activated by the transmission activation line 49 as necessary, 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 explained. FIG. 4 is a diagram showing the allocation of system time slots of control channels to each base station in the mobile communication system of the present invention. FIG. 5 is a time chart of each signal during registration of a mobile station in the mobile communication system of the present invention. FIG. 6 is a time chart of each signal when a mobile station makes a call using the mobile communication system of the present invention.

A virtual system time slot 301 is 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 the instruction from the control section 21 in accordance with the system time slot 301. As a result, mobile station 4
01 uplink slot 303 is virtually created, and when the mobile station 401 transmits a signal, it selects an appropriate one of these slots.

Similarly, base station 20B and base station 2
0c transmits the base station 20B downlink signal 304 and the base station 20c downlink signal 306, respectively. As a result, mobile station 402, uplink slot 305 and mobile station 40
3 upstream slots 307 are virtually generated.

In FIG. 4, a relatively large number of mobile stations are registered with base station 20A, and base station 20A is allocated more system time slots than base station 20B and base station 20c.

An example of registration of mobile station 402 is shown in FIG. The mobile station 402 receives downlink signals transmitted periodically on the control channel from each of the base stations 20A to 20C, and determines the base station with the highest field strength. In this case, mobile station 4
02, base station 20B has the highest electric field strength.

Mobile station 402 receives idle signal 101 transmitted on the control channel of base station 20B, and transmits registration signal 102 in synchronization with this. Base station 20B
transmits the registration completion signal 103 in the system time slot assigned to its own station, and returns to the idle signal 101 at the next timing.

Next, an example of the calling operation of the mobile station 402 is shown in FIG.
This is explained by: It is assumed that mobile station 402 is registered with base station 20B. The mobile station 20B transmits a calling signal 112 in timing with the idle signal 101 in the same manner as described above. The base station 20B transmits the communication channel M (M=1 to N), which is available throughout the base station, to the mobile station 402 using the response signal 113.
and starts communication channel M. The response signal 113 causes the mobile station 402 to shift from the control channel to the communication channel M.

[0026]

As explained above, the present invention has an excellent effect of improving the efficiency of use of control channels and communication channels.

[Brief explanation of the drawing]

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 in the mobile communication system of the present invention.

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

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

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

[Explanation of symbols]

10 Control station 11 Logic section 12 Switch section 20A, 20B, 20C Base station 21
Control unit 22 Control channel transmitter/receiver 23 First communication channel transmitter/receiver 24
Nth communication channel transmitting/receiving section 25, 42 Antenna common section 26, 41 Antenna 30A, 30B, 30C area 401, 4
02, 403 Mobile station 43 Transmitter 44 Receiver 45 Signal processor 46 Handset 47 Modulation signal line 48 Demodulation signal line 49 Transmission activation line 50 Electric field information line 51 Channel designation line 60 Contact line 70 Telephone 101 Idle signal 102 Registration signal 103 Registration Completion 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 Downlink signal 305 Mobile station 402 Uplink slot 306
Base station 20C down signal

Claims (3)

[Claims] Claim 1: A plurality of base stations that utilize one control channel and a plurality of communication channels; one control station connected to the plurality of base stations; The transmitting/receiving means of each base station is equipped with one control channel and a mobile station capable of communicating through a plurality of communication channels, and the transmitting/receiving means of each base station transmits an idle signal to the mobile station in order in pre-allocated system time slots of the control channel. The transmitting/receiving means of the mobile station selects a base station with a strong electric field strength based on the electric field strength of the idle signal from each of the base stations, and transmits a registration signal to the control channel in synchronization with the idle signal. The transmitting/receiving means of each base station includes means for returning a registration completion signal to a pre-assigned system time slot of the control channel based on the registration signal, and the transmitting/receiving means of the mobile station transmits the registration signal. and means for transmitting a calling signal to the control channel in synchronization with the idle signal of the base station, the transmitting/receiving means of each base station starting up one of the vacant communication channels based on the calling signal, The transmitting/receiving means of the mobile station includes means for returning the response signal to a pre-allocated system time slot of the control channel, and the transmitting/receiving means of the mobile station includes means for transitioning from the control channel to the established communication channel based on the response signal. 1. A mobile communication system comprising: the pre-assigned system time slots having a different number within a repetition period for each base station. 2. Claim 1, wherein the number of system time slots of the control channel allocated in advance to each of the base stations corresponds to the number of mobile stations registered with each of the base stations.
Mobile communication method described. 3. The mobile communication system according to claim 1, wherein a plurality of communication channels are used in common by the plurality of base stations.