JPS5812445A - Mobile body communication system - Google Patents

Abstract

PURPOSE:To utilize a circuit effectively by using a paging channel as an emergency radio channel. CONSTITUTION:A radio terrestrial station 1 and a general moving body 2 comminicate with each other on a paging channel P and a calling channel S. In the figures, 3-3'' are areas that the radio base station covers, and 5 is a moving body in an emergency. When there are many free channels in the areas 3-3'', specific channel assignment for emergency is not performed specially. When, however, free channels decrease in number, the number of general channels is decreased to increase the number of specific channels for emergency. Namely, once a specific channel flag for emergency is used, another channel is assigned newly as a specific channel. Further, when a free channel is only the paging channel, the paging channel itself is designated as the specific channel for emergency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mobile communication system having multiple wireless areas and multiple wireless channels within each wireless area. This relates to effectively securing wireless lines.

Conventionally, in this type of communication system, the specific call channel for ViP is a call channel with a predetermined specific number, and has the following characteristics.

(I) When a plurality of ViP mobile bodies converge in an emergency or the like, the ViP mobile bodies can only respond to a predetermined specific channel.

(11) General mobile objects cannot use the specific channel determined for ViP.

(i1+ In an emergency or when a mobile unit for ViP is not using it, the specific channel determined for ViP cannot be used.

It is an object of the present invention to eliminate these conventional drawbacks and provide a new mobile communication system that makes effective use of wireless lines.

This will be explained below along with examples. In Figure 1, 1
is a wireless base station, 2 is a general mobile object, 3 is a wireless area covered by wireless base station 1, 3' and 3' are each other wireless area, 4 is a communication area between wireless base station 1 and two mobile objects 2 Paging channel P and call channel S used for
, S is an urgent mobile object.

Normally, the radio base station 1 broadcasts a plurality of channel numbers of communication channels that the mobile unit 2 can use for communication on a paging channel. When the mobile unit 2.6 takes in this content and makes a call, it arbitrarily selects one channel from among the plurality of call channels shown in the paging channel and sends a calling signal to the wireless base station 1. When the station 1 receives the calling signal, it sends the calling response signal to the mobile unit 2,
Return to 6. Thereafter, communication between the wireless base station 1 and the mobile units 2 and 6 is performed using this communication channel.

Figure 2 shows signals broadcast from base radio station 1 to mobile units 2 and 5, where 21 is a number indicating the location of the corresponding radio station, and 2
2 to 24 are communication channel signals.

Figure 3 shows the details of the communication channels 22 and 24, where 31 is a system-specific number given to this system, and 32 is a general communication channel indicated by the communication channel number 33 and a specific channel for ViP. It is a distinguishing signal.

Note that the specific channel for ViP, which is distinguished by the signal 32, can be responded to only by emergency mobile units, and the general channel can be responded to by emergency and general mobile units.

FIG. 4 is an example of a channel management chart provided in a wireless base station, and the wireless base station broadcasts on paging channels according to this allocation. As shown in Figure 41, if there are a large number of channels that are assigned to area 1 and are not in use, the number of call channels broadcast on the baging channel is 6 channels, and the channel V reserved for ViP is In the case of 6, the number of channels for ViP is 0 channels and the number of channels for general use is 6 channels. In other words, a mobile unit for ViP can respond to all channels being broadcast, so it is possible to
The number of channels that can be answered by mobile units for general use is 6 channels, and the number of channels that can be responded to by mobile units for general use is also 6 channels.

In addition, there are many channels that are not being used, so even if the currently broadcasting channel is used, it will be immediately updated to the next new channel number and broadcast, so it is especially important to use Vi
There is no need to specify a channel for P.

At the same time, as shown in 42, when the number of channels that are not being used is 9, the general channels are set to 4 channels, and the number of channels for ViP is set to 2 channels. Thereafter, similarly, when the number of channels that are not being used for calls decreases, the number of general channels is decreased and the number of channels for ViP is increased.

That is, the flag of the communication channel signal broadcast from the wireless base station is not assigned to a channel with a certain specific number, but is assigned so as to secure the number of channels for ViP assigned to the corresponding area. Therefore V
When a channel with an iP flag is used, another channel is designated for ViP use. Furthermore, as shown in 43, if the number of channels that are not being used is 1 channel, that is, only the paging channel, the number of channels for ViP is 1 channel, that is, the paging channel itself is designated as the channel for ViP, and the flag and channel number are set as the paging channel. broadcast on the channel.

However, if the channel used for the call becomes vacant, the call on the paging channel can be forcibly transferred to the busy call channel, and the paging channel can be returned to its previous function.

As is clear from the above description, this embodiment has the following features.

(1) If there are many channels that are not being used,
No channel is specified for IP. Therefore, ViP
Both commercial and general mobile units can freely access the empty communication channel.

(2) When the number of unused channels decreases and it is necessary to secure channels for ViP, broadcast on a paging channel in order to secure as many channels for ViP as are allocated to the pot area. It is possible to attach a flag that can only be used for ViP to an empty communication channel, and prohibit access by general mobile devices.

(3) When a channel with a ViP flag is used, a new channel for ViP can be designated from channel 7:2 which is not used for the remaining calls.

4) When there is only one channel that is not used for calls, that is, when there is only a paging channel, the paging channel can be used only for ViP to make calls.
This is a great advantage for the effective use of wireless channels of a certain type of system.

As is clear from the above embodiments, according to the present invention, the paging channel can be used as a wireless channel, so that the line can be used effectively.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram of a mobile communication system according to an embodiment of the present invention, Fig. 2 is a schematic diagram of data broadcast from a base radio station to a mobile unit, and Fig. 3 is a detailed schematic diagram of a communication channel signal. , FIG. 4 is a channel management diagram for ViP provided in a wireless base station. 1... Radio base station, 2, 3... Mobile object.

Claims (1)

[Claims] In a mobile communication system that has a paging channel for broadcasting to and calling a mobile unit, and a call channel for making calls, a channel with a specific number is used for calls to and calls from a specific mobile unit. A mobile communication system characterized in that a paging channel is used as an emergency radio channel without providing a radio channel.