JPH0250533A - Position registering system in mobile communication - Google Patents

Abstract

PURPOSE:To reduce control traffic and to effectively use a frequency for control by providing a static detecting mechanism to generate a detecting output to a mobile terminal unit when the moving terminal unit is static, and suppressing a position registering control by the detecting signal from the static detecting mechanism. CONSTITUTION:An external power source 9 is supplied through a terminal part 10 to a mobile terminal, the electric power is supplied and charged through a rectifier 12 and a resistance 13 to a battery 14, the mobile terminal is supplied to an electric power circuit terminal 15, then direct current voltage is fetched from a detecting terminal 16 to a CPU 6 and a static condition is detected. When the device is carried as the mobile terminal, by switching off, the device itself acknowledges that it is moved at present. The CPU 6 to acknowledge the movement turns on a transmitter 3, reads its own identifying signal from an IDROM 7, converts it to a suitable frequency by the output of a frequency generating circuit 5 and sends a position registering request signal through an antenna sharing device 2 and an antenna. Thus, since the position registering signal is not transmitted in the static condition, the exchange of the control signal is minimized and traffic of the radio frequency is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] The present invention relates to a location registration method for reducing control traffic in a mobile radio system that requires recognition of the current location of a mobile object.

[Prior art and its problems]

Knowing where various mobile units are currently located within the service area is a requirement in this type of mobile radio system, and various methods have been put into practice for this purpose. The purpose of knowing the current location of a moving object is to simply know the location, and to take some action after knowing the location.

The former is used, for example, to know the range of activity of cats, to collect various statistical data, and to collect information on VIPs (VIPs).
Or conversely, the whereabouts of a person of interest, such as a wandering elderly person, must be constantly monitored and confirmed.

The latter, as typified by car telephones, is one that knows the zone in which a mobile object is located and allows calls to be made and received through the zone in which the mobile object is located. From now on, the explanation will be mainly related to the latter.

In the current general car telephone system, in order to accommodate many subscribers (cars as mobile terminals), the service area is divided into many zones called cells, and radio waves reach cells that are more than a certain distance away. A method is being used to utilize the same frequency reuse to make effective use of frequencies, construct multiple service areas, and allow a large number of automobiles to subscribe.

Although it is easy to make a call using a mobile terminal such as a car phone, many tricks are required to receive a call. Methods for calling a mobile terminal moving to an unspecified location include a method of calling all cells at once, and a method of calling each cell sequentially. However, although these methods can be used in small-scale systems with a small number of cells and mobile terminals, in large-scale systems, there are many unnecessary calls, which is undesirable in terms of radio frequency usage. Particularly in the latter case, the time required for the call increases, making it impractical.

As a countermeasure to this problem, location registration technology for mobile terminals has been devised. In other words, the mobile terminal automatically informs the control station, which is the backbone of the entire system, of its location through the wireless base station, and the control station that receives this memorizes it and uses it when calling the mobile terminal. There is a method of calling from the corresponding wireless base station by referring to the following.

As a method for location registration, there is a method in which the mobile terminal automatically sends a short transmission at regular intervals to notify the control station of the name of the wireless base station to which it has been connected. In this method, many mobile terminals emit radio waves for location registration many times even when they are not moving, resulting in increased traffic, which is good for small-scale systems, but inappropriate for large-scale systems. Furthermore, since mobile terminals often emit radio waves, their batteries are consumed rapidly, making them unsuitable for portable devices that operate on batteries.

Therefore, it is desirable to register the location only when the mobile terminal moves to the zone where the location should be registered. As a method, the mobile terminal constantly monitors the radio field intensity or demodulation S/N of the broadcasting radio waves from the radio base station, and when it falls below a certain value, it switches the channel and listens to radio waves from radio bases in other zones. Detects the radio field strength or demodulated S/N of radio waves for notification,
If the intensity of the notification radio waves in another zone exceeds a certain value, it is determined that the zone has moved.

Even with this method, each cell's wireless base station continues to emit radio waves to notify mobile terminals of its presence.
The dedicated frequency will be monopolized. Therefore,
This method has the disadvantage of being unfavorable from the standpoint of effective frequency utilization.

[Purpose of the invention]

The present invention provides a location registration method for mobile communications that can reduce control traffic and effectively utilize control frequencies using a wireless system that suppresses location registration of a mobile body while the mobile body is stationary. The purpose is to

[Structure and operation of the invention]

In order to achieve this objective, the location registration method for mobile communication of the present invention includes a mobile terminal device equipped with a stationary detection mechanism that outputs a detection output when the mobile terminal device is stationary, and a stationary detection mechanism that outputs a detection output when the mobile terminal device is stationary. The sensor is configured to perform control to suppress location registration control based on the detection signal.

Before giving a detailed explanation of the present invention, a description will be given of common elements among systems that have been put into practical use in car phone systems and various mobile phone devices that have been proposed. Figure 5 shows this situation. A hexagonal portion 23 indicates a radio wave service area (cell), and a wireless base station 25 is located in the center of the area, from which wired/wireless conversion is performed. Control station 26 via wired line 29 from wireless base station 25
are collected in. The control station 26 is connected to a wired circuit w128 via a line 27. The central station 26 stores the location of the mobile terminal 24 through location registration, which will be described later.
and calls the mobile terminal 24.

The above is a general wireless system configuration, and the location registration method of the present invention used in these will be explained in detail below.

FIG. 1 is a hardware configuration diagram of a mobile terminal for implementing the present invention.

The characteristic feature is that the stationary detection structure 8 is built in as a sensor, and the signal from this sensor is taken in and processed by the CPU 6.

FIG. 2 shows a principle diagram of an example of a stationary detection structure constituting the present invention. The stationary detection structure is for detecting that the mobile terminal is currently in a stationary state, and in FIG. 2, the time when the mobile terminal is charging is treated as being in a stationary state.

In Fig. 2(a), the external power supply 9 for charging is connected to the terminal lO.
The power is supplied to the mobile terminal via the rectifier 12 and the resistor 13 to charge the battery 14, and the mobile terminal is also supplied to the power circuit terminal 15.
The DC voltage at that time is taken into the CPU 6 from the detection terminal 16 to detect the stationary state.

In FIG. 2(b), for charging, the output from an external AC power source 17 is rectified by a rectifier 18 and a capacitor 19 and supplied to the mobile terminal, and the power is supplied to the mobile terminal through a diode 12 and a resistor 1.
3 and is supplied to the battery 14 and charged. It is also supplied to the power circuit terminal 15 of the mobile terminal, but the ripple included in the DC voltage at that time is taken out by a resistor 11 and a capacitor 20, rectified by a rectifier supply 21 and a capacitor 22, and converted into DC. , this voltage is taken into the CPU 6 from the detection terminal 16 to detect a stationary state.

Regarding the stationary detection structure, for example, a protrusion 30 may be provided on the charging stand 40 as shown in FIG. 2(C), or a protrusion 30 may be provided as shown in FIG.
A protrusion 31 is provided on the mobile terminal as shown in FIG. There is a way to do it. Many other variations such as magnetic sensors and light can be used.

When a device configured in this manner is placed on a charging stand or on a stand, the mobile terminal itself recognizes that it is in a stationary state. The CPU 6, which recognizes the stationary state, stops sending out the location registration request signal.

When a person carries a device configured in this way as a mobile terminal, the device recognizes by itself that it is currently moving by turning off the switch 32 or 33. CP that recognized the movement
U6 turns on transmitter 3 and transmits its own identification signal to IDRO.
The signal is read from M7, converted to an appropriate frequency by the output of a frequency generating circuit 5 such as a synthesizer, and sent out as a location registration request signal via the antenna sharing device 2 and the antenna 1. The wireless base station that received this signal replies with its own base station ID indicating that it has received the signal.

The mobile terminal in FIG. 1 transmits this signal to the antenna 1. Antenna sharing device 2. It is received via the receiver 4 using the output of the frequency generation circuit 5, and if the signal level or demodulation S/N is above a certain value, the location is registered again through the same wireless base station and sent to the control station. Notice.

A signal processing flow according to the present invention is shown in FIG.

As can be seen from the flowchart in FIG. 3, when stationary, there is no need to wastefully emit radio waves for location registration, resulting in effective use of frequencies.

If the signal processing of a mobile device incorporating the stationary detection structure 8 is changed, it will function more efficiently.

This processing flow is shown in FIG. The difference from Figure 3 is that a counter is included. This counter is C
It may be processed internally by the PU or may be added externally using hardware. This made it possible to respond to the following events.

(1) In the flow shown in Figure 3, if the mobile terminal is not moved at all, no location registration is performed at all, but there is a mode in which the control station deletes information that is too old because it is unreliable. By registering your location on a timer from time to time, you can now provide new location registration information.

(2) Generally, location registration is performed by registering with the wireless base station closest to the mobile terminal, but if this wireless base station is in use for a long period of time due to other incoming calls or other outgoing calls, ,
It becomes impossible to receive calls to the mobile terminal. When the process is performed according to the flow shown in FIG. 4, after a certain period of time, the user can register his location with another available wireless base station and receive incoming calls without having to move.

As mentioned above, it has been found that the functionality can be greatly improved by using the stationary detection structure and the timer together as shown in FIG.

〔Effect of the invention〕

As explained in detail above, in the present invention, a location registration signal is not transmitted in a stationary state, so the exchange of control signals is reduced, radio frequency traffic is reduced, and connection time is shortened by this amount. It became possible to increase the number of cars accommodated. Another feature is that the number of times a mobile terminal transmits a location registration signal is reduced, which reduces battery consumption, allowing it to be powered by a small battery, which can greatly contribute to making devices smaller and lighter.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing a configuration example of a mobile terminal used in the present invention, Fig. 2 is a circuit diagram showing the principle of a stationary detection structure used in the present invention, and Fig. 2 (C) (d) is used in the present invention. A schematic diagram of a cross section and a circuit showing a specific configuration example of a stationary structure, FIG. 3 is a flowchart showing a signal processing flow from a stationary detection structure in the present invention, and FIG. 4 shows an operation flow in combination with a timer in the present invention. The flowchart, FIG. 5, is a schematic diagram of a general mobile telephone system. 1... Antenna, 2... Antenna sharing device, 3
...Transmitter, 4...Receiver, 5...Frequency generation circuit, 6...CPU, 7...I D-R
OM, 8... Stationary detection structure, 9, 14... Battery,
10...terminal, 11.13...resistance, 12.
18.21... Rectifier, 15... Circuit terminal, 16
...Detection signal terminal, 17...External AC power supply, 1
9.20.22... Capacitor, 23... Service area, 24... Mobile terminal, 25... Wireless base station, 26... Control station, 27... Line, 28...
Wired circuit network, 29...Wired line, 30, 31...
・Protrusion, 32.33...Detection switch, 40...
Charging stand. salary 1 figure

Claims (2)

[Claims] (1) The mobile terminal device is equipped with a stationary detection mechanism that outputs a detection output when the mobile terminal device is stationary, and the detection signal from the stationary detection mechanism is used to perform control to suppress location registration control. A location registration method in mobile communication characterized by the following configuration. (2) The mobile terminal is equipped with a stationary detection mechanism that outputs a detection output when the mobile terminal is stationary and a timer that outputs a timer output at predetermined intervals, and the position is registered based on the detection signal from the stationary detection mechanism. 1. A location registration method for mobile communications, characterized in that the method is configured to perform control to suppress the location registration and to perform control to permit location registration based on the output of the timer.