JPS5888940A - Zone selection type portable telephone system - Google Patents

Abstract

PURPOSE:To set lines via a medium-scale zone, when channels in a small-sized zone are jammed, by forming a service area into a plurality of small-sized zones and medium-scale zones including a plurality of small-sized zones, in a portable telephone system. CONSTITUTION:A service area is aplit into a plurality of zones, a medium-sized zone G1 corresponds to small-sized zones F1, F2 and F3 and the two zone constructions are overlapped. In setting a radio line between said zones and a portable telephone set 5 of the F1 zone, N channels can be set in the F1 zone via a terminal station 1 and when the channels in use are (N-1), the telephone set 5 can be connected to the terminal station 1 without fail. If the margin of the channels is lost, the terminal station 1 transmits congestion information and the registration number ID1 of the station 1 to a paging channel, registers the ID signal of the portable set to a terminal station 4 of a medium-scale zone via an exclusive control line 8, the call from the terminal station is done from the terminal station 4 and the access from a portable telephone set 6 is done to the terminal station 4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a zone configuration that copes with congestion of radio channels in a mobile phone system without reducing the frequency utilization rate.

A possible example of a public phone service is a mobile phone service that allows calls to be made anytime and from anywhere. In order to improve portability, it is necessary to make it as small as possible.
It is difficult to use small batteries. Since a small battery has a small power capacity, it is necessary to reduce the high frequency output power in order to extend the usage time of the battery. Therefore, when a mobile phone service is provided in a small zone configuration, the size of the basic zone is approximately 100 m to 300 m in diameter, which is very small and the density of the zone is also very high.

FIG. 1 shows an example in which a conventional small zone configuration (three zones repeated) is applied to a mobile phone. A group of wireless channels F, , F, , F, is assigned to each zone, and the wireless communication channel connected to the mobile phone is connected to the existing telephone line network or dedicated line for each zone. By the way, in such a small zone configuration, since the size of each zone is quite small, the frequency of temporary traffic concentration occurring in some zones is quite high. Also,
Since the number of wireless channels in each zone decreases, the line concentration effect decreases, and the average line usage efficiency also decreases. Therefore, in order to prevent each zone from becoming congested, it is necessary to set the number of wireless channels in each zone considerably more than the average number of used channels, and to make effective use of the radio frequency spectrum. The drawback was that it was impossible to do so.

The present invention aims to improve the above-mentioned drawbacks of the prior art, and its features are that the service area is divided into a plurality of zones, and each zone is connected to a mobile phone by a wireless line. In mobile phone systems where terminal stations connected to the telephone line network are established, the service area is divided into multiple small zones, and the service area is arranged to include multiple small zones and overlap with the small zones. If a large-scale zone is created and the wireless line in the nearest small-scale zone is available at the time the mobile phone makes a call and starts talking, a wireless line is set up via the small-scale zone and the call begins. If the wireless channel in the nearest small-scale zone is crowded at the time of This is a mobile phone system in which control is given so that when a channel in a small zone becomes available, the channel is preferentially switched to that channel. Examples will be described below with reference to the drawings.

An embodiment of the invention is shown in FIG. −As shown in the figure, a medium-sized zone corresponds to each repeating unit of a small-sized zone,
Overlap the two zone configurations.

For example, small-scale zones F, , F2. Medium-sized zone G corresponds to F3. Here, the procedure for setting up a wireless line with a mobile phone in the F1 zone will be explained in detail using FIG. 3. 1.2 in the same figure
．． 3 is a terminal station in a small-scale zone, and 4 is a terminal station in a medium-sized zone. 4 to 1.2.3 are dedicated control lines 8 and 9, respectively.
．． There are 10. The radio line is connected to a general telephone network or a dedicated telephone line at these terminal stations. Assume that in zone F, N communication channels can be set via terminal station 1.

Now, when setting a communication channel with the mobile phone 5 in the F1 zone, if the number of channels already in use is N-1 or less, 5 is necessarily connected to 1. 5 is connected, all N communication channels are set, and there are no more channels left. At this time, terminal station 1 sends the congestion information to the paging channel.
It is sent together with the registration number ID. In addition, the dedicated control line 8
The ID signal of the portable device whose location has been registered in the terminal station 1 is registered in the terminal station 4 using . Therefore, in this case, the call from the terminal station is made from 4K. Now, when accessing from the mobile phone 6, by reading the congestion information, it is possible to know that there is no free communication channel on Fl, so a line is established between the mobile phone 6 and the terminal station 4 in the medium-sized zone. An access signal is sent to the terminal station 4 to request the setting.

At this time, the access signal includes, in addition to your own ID information,
It also sends out ID1 information to notify that the signal came from zone F. With this control, the call channels that were traditionally installed in each small zone can be
Can be grouped into medium-sized zones.

Therefore, the waste of the system can be saved (also,
The frequency spectrum can be used effectively.

By the way, since the medium-sized zone has a relatively large degree of friendliness, it is generally necessary to increase the transmission RF output power.

This is undesirable because it shortens the battery usage time. Therefore, the terminal station 4 measures the average received power, and if 4 and 6 are close, controls are performed to suppress the transmitted RF output power of 6, thereby suppressing power consumption. Furthermore, when terminal station 1 has a free call channel, it notifies terminal station 1 to terminal station 4 via the control line 8 that there is a free call channel, and the call that should originally have been made with terminal station 1 is sent to terminal station 4. channels, i.e. 6
The communication channel between and 4 is switched to the channel between 6 and 1. In this case, if there are several calls to be switched, the end station is switched from the longest call time to the next.
Switch to

For example, when terminal station 1 has one free channel, mobile phones 6 and 7 are talking to terminal station 4, and 6
If ``6'' has started talking first, 6 is switched to ``1''. In addition, priority is given to setting a new communication channel between the other mobile phones 11 and 1 in zone F to avoid one mobile phone from being in a high output power state for a long time. In the above channel switching, the line between -6 and 4 was originally supposed to be set up between 6 and 1, rather than between 6 and 2 or 6 and 3. When setting up the line,
Of the congestion information sent by 1, the registration number ID is transferred to 4 via 6, so it is easy to understand. In addition, even if you move from F zone to F zone during a call in a medium-sized zone, first set the channel as 1, then terminal station 1 detects that the reception rep is low, and selects the adjacent channel. The electric field level information is collected at the terminal station IIC through the control circuits 9Iill, 12°15.16, and the optimum channel voice switching to F4 V-1 is performed.

Furthermore, if terminal station 1 is equipped with a device that monitors the fading pitch during a call, and the pitch corresponds to high-speed Ray-Ray fading, it is obvious that the mobile phone is moving at high speed. Therefore, the ID of the mobile phone and information identifying that it is moving at high speed are transmitted to the terminal station 4 through the control line 8, and a communication channel is set up with the medium-sized zone. that way,
Since the zone range is wide, there is no need to switch channels frequently. However, for mobile phones that receive many calls from mobile devices, the power unit 1 with a large transmitting RF output power is required.
8 must be used as an adapter. In addition, in FIG. 4, 17 is a mobile phone, and a power unit 18 can be coupled to the lower end.

In the present invention, a small-scale zone has a service area of 100 to 300 m in diameter, each small-scale zone includes approximately 10 additional lines or less, and a medium-sized zone overlaps a small-scale zone with 10 or less lines. In this case, it is sufficient that the output power of the mobile phone when using the medium-sized zone is within three times that when using the small-scale zone.

As explained above, instead of σ being prepared in each small-scale zone as a backup line to prevent congestion, it is prepared all at once in the medium-sized zone, which can improve line usage efficiency. Therefore, the frequency spectrum utilization efficiency can also be increased.

[Brief explanation of the drawing]

FIG. 1 is a conceptual diagram of a conventional small zone configuration, FIG. 2 is an embodiment of the present invention, and is a conceptual diagram showing the overlap of a small zone and a medium zone. FIG. 3 is an explanatory diagram of a line connection procedure. FIG. 4 shows an example of how the power unit is used. 1.2.3... Each small zone F,
, F2. Terminal station 4 in F......Terminal station 5 in medium-sized zone G1 6, 7, 11...Mobile phone 1 in zone F1
2.13, 14, 15, 16... Control line between small zones 17... Mobile phone 18...・・・・・・Power unit patent applicant Nippon Telegraph and Telephone Public Corporation Patent application agent Megumi Yamamoto

Claims (1)

[Claims] In a mobile phone system where the service area is divided into multiple zones, and each zone is connected to a mobile phone via a wireless line and has a terminal station connected to the telephone line network, the service area is divided into multiple small zones. In addition to being divided into large-scale zones, a medium-sized zone is created that includes multiple small-scale zones and is placed so as to overlap the small-scale zones, and when a mobile phone starts a call, it connects to the wireless of the nearest small-scale zone. If the line is empty, set up a wireless line through the relevant small zone, and if the wireless channel of the nearest small zone is busy at the time of starting the call, set up the wireless line via the mobile phone. The feature is that a wireless channel is set through the nearest medium-sized zone while performing high-frequency output power control, and when a channel in the small-scale zone becomes vacant, the channel is controlled to be switched preferentially to the corresponding channel. Mobile phone system.