JPS58131830A - Mobile radio communication system - Google Patents

Abstract

PURPOSE:To recognize the state of communication channel control for each base station or mobile station, by inserting the information of operating state of each channel and of a communication rest time to a signal transmitted from a control station. CONSTITUTION:Base stations 2 and mobile stations 3 of each group receive a control signal including various information from the control station on an outgoing control channel and displays the state of each channel based on this information. For example, one mobile station 3 designates a communication channel in use and makes an inquiry on an incoming control channel, the number of group using the communication channel is displayed. When the mobile station 3 makes a call during the illumination of a yellow light, a reservation communication is done and a reservation waiting time is displayed. Since no reception of reservation communication is done during the illumination of red light, no calling is done even if the mobile station 3 hooks up and an alarm display is done.

Description

[Detailed Description of the Invention] [Technical Field to which the Invention Pertains] The present invention relates to taxi radio and other mobile radio systems in which several groups (several companies) jointly use the same channel, and one group The present invention relates to a mobile radio system configured such that when a group is using one communication channel, other groups cannot use this communication channel.

[Background of the invention]

Conventionally, in this type of mobile radio system, base stations and mobile stations in each group communicate via a control station, and each mobile station waits on a downlink control channel from the control station and receives the designation of an idle channel number. Then, one designated group of mobile stations and base stations conduct a call via this designated uplink and downlink communication channel. During this time, stations in other groups are prohibited from using this communication channel.

Since the number of channels allocated to this type of mobile radio system is smaller than the number of groups, if calls occur that exceed the communication capacity, priority is given to first-come-first-served calls.

Therefore, if one group's call time is long, other groups will have to wait for a long time, and fair communication will not be possible. For this reason, we set a limit on the time that one group can use one call channel continuously, and when this time arrives, the control station automatically sends a control signal and uses the call channel until then. The group that was in l- is forcibly moved to the standby state.

In such a system, in order to conduct effective communication with less waste, each station must know the usage status of the call channel, and during a call, be aware of the remaining time that its own group can use the call channel. It is desirable to be able to do so.

[Purpose of the invention]

The present invention was made against this background, and an object of the present invention is to provide a method in which each base station or mobile station can recognize the state of communication channel control and use frequencies effectively. shall be.

[Summary of the invention]

In the present invention, a plurality of communication channels are shared by a plurality of groups of base stations and/or mobile stations under the control of one or more control stations, and the base stations and mobile stations stand by on a control channel and use the control channel. In a mobile radio communication system configured to receive a designated communication channel and perform communication between one group of base stations and mobile stations on this communication channel, a signal transmitted from the control station includes:
The present invention is characterized in that it includes at least information on the usage status of each communication channel and remaining communication time, and includes means for optically displaying this information on at least some of the base stations and mobile stations.

[Explanation of Examples]

FIG. 1 is a conceptual diagram showing an example of the configuration of the system of the present invention. In FIG. 1, 1 is a control station, which is installed, for example, in a high place near the center of a city. Reference numeral 2 denotes a base station, which is, for example, the headquarters of each taxi company, and is shared by several companies to fully utilize this system. 3 is a mobile station, and each mobile station 3 belongs to one of the base stations 2, that is, to one of the companies.

Here, one company is represented as one group.

In this system, one control channel for each uplink and downlink, and several sets of communication channels, one set for uplink and one downlink, are allocated. For example, if the number of groups is 10, there are 3 sets of communication channels. The base station 2 and mobile station 3 devices can transmit to each uplink channel and receive each downlink channel out of this one set of control channels and three sets of communication channels. The control station 1 receives the upstream channel of the control channel and communication channel, and transmits it to the downstream channel. Furthermore, the control station 1 is equipped with a booster and a device for amplifying the signal received on the upstream channel of the communication channel and broadcasting it on the downstream channel.

With such a configuration, each base station 2 and mobile station 3 is in a standby state receiving the downlink of the control channel when not making a call. Now, when one mobile station 3 makes a call, it automatically transmits its own code consisting of a pulse train on the uplink of the control channel, and when this is received and identified by the control station l,
A pulse train is transmitted down the control channel to designate the first communication channel to all mobile stations 3 and base stations 2 in the group to which the calling mobile station 3 belongs.

When each of the mobile stations 3 and base stations 2 that have received this message identify that the designation is for their own group, their transmission and reception frequencies are automatically switched to the first communication channel at the same time. Mobile stations 3 and base stations 2 other than that group are left in a standby state where they continue to receive the downlink of the control channel.

Each station in the group that has moved to the first communication channel can freely transmit to its upstream channel. Since it is amplified by the control station 1 and broadcast down the first communication channel, its contents can be received. When this first call channel is not used for several consecutive seconds or after a predetermined exclusive time has elapsed,
A control signal is broadcast from the control station 1 to the downlink of the first communication channel, and the transmitting and receiving frequencies of each mobile station 3 and base station 2 are switched all at once and the control signal is returned to the control channel.

Here, the feature of the system of the present invention is that the control signal transmitted from the control station 1 includes information necessary for control as well as the usage status of each communication channel and the information regarding exclusive use of the communication channel. This is appropriately displayed on each base station 2 and mobile station 3, including information such as the remaining time available, so that each station can recognize the status of the entire system.

FIG. 2 is a diagram showing the format of the control signal sent to the control channel. This control signal is 1200
This is a USK signal with a speed of btt/θθC.

The control signal consists of a 3-bit synchronization hit 5 and 11 channel bits 71 to 11 provided according to the communication channel, separated by a 2-bit inter-bit interval 6.
7m and a designated bit 8 consisting of 86 bits.

With this configuration, the first bit of each channel bit 71 to 7rn indicates whether the channel is free or in use. The next 6 bits display the number of the group using that channel.

The next 4 bits display the remaining time allowed for exclusive use of the call for that group in minutes. Furthermore, designation bit 8 specifies the number of an empty communication channel corresponding to the next call using 4 bits. If there are no free channels, use this 4
All bits become "0". If all 4 bits specifying free channels are 0, the next 5th bit changes from 0 to 11, indicating that there are no free channels and reservations are being accepted, and the 6th and 5th bits indicate the reservation waiting time. is displayed in seconds. Starting from the 11th bit, the reserved call accepted resident numbers for 10 stations are transmitted in 7 bits each.

The base station 2 and mobile station 3 of each group receive the control signal on the downlink control channel, and the status of each channel is displayed based on this information. In other words, the usage status of each communication channel is displayed by lighting a light emitting diode corresponding to each communication channel in blue. When all call channels are displayed as being in use, the other light emitting diodes will light up yellow, indicating that reservation communication is being accepted. When the reserved communication reception area becomes full, the other light emitting diodes light up in red, indicating that the reservation communication reception has been stopped.

Further, when one mobile station 3 specifies the call channel in use and makes an inquiry on the uplink control channel, the number of the group using the call channel is displayed. Further, if the mobile station 3 makes a call while the yellow light is on, it becomes a reserved communication and the reserved waiting time is displayed. This reserved waiting time changes depending on traffic conditions. Since reservation communication reception is not performed while the red light is on, even if the mobile station 3 hooks up, a call is not made and an alarm is displayed (for example, an alarm sound). Furthermore, when the mobile station 3 cancels the reserved communication, the reserved waiting time display goes out. Further, the number of the mobile station 3 is deleted from the reserved call accepted citizen number in the designated bit 8 of the control signal, and the acceptance order is moved up one by one.

[Explanation of effects]

As described above, according to the present invention, various types of information on all communication channels are transmitted to each base station and mobile station, and the base station or mobile station receives and displays this information.

Therefore, each base station and mobile station can communicate efficiently while recognizing the overall situation, so it is possible to provide a mobile radio system that can effectively utilize frequencies.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of main parts of an embodiment of the present invention. FIG. 2 is a diagram showing a signal format of a control signal. ■...Base station, 2...Antenna, 31~3n...Mobile station, 5...Synchronization bit, 6...Interval between bits, 7°~7...Channel bit, 8... -Specified bit. Patent Applicant: NEC Co., Ltd. Agent, Patent Attorney: Naoto Ide, Takayoshi 2. Draft procedure amendments] Case description: 1982 Patent Application No. 14458 2, Title of invention: Saikodo Ryoukoizumi L4 Yoshikata Iri 3 Make amendments Relationship with patent applicant case Patent applicant 4, agent 6 Number of inventions increased by amendment None 7, subject of amendment
Contents of amendment (1) The scope of claims is amended as shown in the attached sheet. (2) Page 4, lines 6 to 7 of the specification “...
...Includes information on the usage status of each call channel and remaining call time, and...'' is changed to [...Includes information on the usage status of each call channel, and...'' ” he corrected. (3) On page 4, line 9 of the specification, after ``...'', it is stated that ``In addition, the signal transmitted from the control station includes information on the remaining call time, and the base station and It is preferable that at least part of the station is provided with means for optically displaying this information.''. (4) In the 15th line of page 7 of the specification, replace ``...consisting of 86 bits...'' with ``
. . . 80 bits..." is corrected. (5) After "Go up" on page 9, line 14 of the specification, the following sentence was added: "In addition, the clock-down timer displays the remaining call time on the mobile station during a call." do. [Attachment] [Claims] (1) A plurality of communication channels are shared by a plurality of groups of base stations and/or mobile stations under the control of one or more control stations, and the base stations and mobile stations In a mobile radio communication system configured to wait on a control channel, receive a communication channel designation through this control channel, and conduct communication between base stations and mobile stations of one group on this communication channel, the control station transmits A mobile radio communication system, characterized in that the signal includes at least information on the usage status of each communication channel, and means is provided for optically displaying this information on at least some of the base station and mobile station.

Claims (1)

[Claims] (1) Multiple communication channels are shared by multiple groups of base stations and/or mobile stations under the control of one or more control stations, and the base stations and mobile stations stand by on the control channel and communicate using this control channel. In a mobile radio communication system configured to receive a designated channel and conduct a call between one group of base stations and mobile stations on this communication channel, the signal transmitted from the control station includes at least the usage status of each communication channel. and information on remaining call time, and comprising means for optically displaying this information on at least some of the base station and mobile station.