JPH0294829A - Call system for mobile radio equipment - Google Patents

Abstract

PURPOSE:To reduce the frequency of occurrence of a failure of a call and to improve the servicability to the user by setting a radio line with a stationary radio equipment of other radio zone if the setting of line with a stationary radio equipment of a radio zone is failed in the case of making a call while storing at least two radio zones. CONSTITUTION:A mobile radio equipment 3a is located at a location where radio zones 51, 52 are overlapped and stores the radio zones 51, 52 as the radio zones to which the mobile radio equipment belongs. In this case, when the mobile radio equipment 3a makes a call, e.g., a stationary radio equipment 41 is selected and the mobile radio equipment sends a call signal 1a including an identification signal of the stationary radio equipment 41. The stationary radio equipment 41 receiving the signal 41a sends a channel designation signal. Thus, if a designated speech channel is busy, the mobile radio equipment 3a sends a call signal 1b including an identification signal of other stationary radio equipment 42 after a prescribed time (t) elapses. Thus, the frequency of the occurrence of a failed call is reduced and the servicability to the user is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention (Industrial Application Field) The present invention relates to a calling method for a mobile communication system having a plurality of mobile radios moving within a plurality of radio zones.

(Prior Art) Conventionally, a plurality of fixed wireless devices are arranged so that a portion of their wireless zones (or service areas) overlap, and communication between mobile wireless devices moving within each wireless zone and a wired telephone line is established. There is a mobile communication system that performs communication.

FIG. 2 is a system block diagram showing the general configuration of this type of mobile communication system. In Figure 2, 3a~
3e is a mobile radio, 41-43 are fixed radios, 51-5
3 is! ! Line zones 6a to 6e are wired telephone lines, and 7 is a line control device. Here, 3a is 6a and 3b is 6b
, 3C corresponds to 6C, 3d corresponds to 6d, and 3e corresponds to 6e. Further, 51 to 53 are wireless zones covered by fixed wireless devices 41 to 43, respectively.

First, the line connection operation will be explained. wired telephone line 6
When there is an incoming call to a, the line control device 7 activates the fixed radio 41 in the wireless zone 51 where the mobile radio m 3 a corresponding to the line 6a exists, and causes the fixed radio 41 to send an incoming call signal. . When the mobile radio 3a receives the incoming call signal, it sounds a sounder to notify the user. When the user responds by going off-hook, the mobile radio device 3a returns a response signal to the line control device 7 via the fixed radio device 11.

The line control unit 'f17 detects this and fixes the wired line 6a, I! ! :Connects to the line device 41 and enables communication between the line 6a and the mobile radio Px 3a.

On the other hand, the user connects the mobile radio 3a to the fixed radio 41 to the line control device! 7, the line control device 7 connects the wired telephone line 6a and the fixed wireless device 41, making it possible to make a call to the wired telephone network.

By the way, when the above-mentioned wired telephone line 6a receives a call, in order for the line control device 7 to send an incoming call signal to the mobile radio device 3a via the fixed radio device 41, the line control device 7 needs to send a call signal to the mobile radio device 3a via the fixed radio device 41. It is necessary to know in advance that the location of 3a is in the wireless zone 51.

Similarly, in order to send a call signal from the mobile radio device 3a to the line control device 7 via the fixed radio device 41, the mobile radio device R3a must know in advance that its location is in the wireless zone 51. Must be.

Therefore, the line control device "f17 detects the location of each mobile radio device 3a to 3e in the following manner.

That is, the line control device 7 connects the fixed wireless 1R41 to 43.
A position notification signal transmission instruction signal is given to the fixed wireless devices 41 to 43 at different times, and position notification signals including a position notification signal and an identification signal unique to each fixed wireless device are sent at overlapping timings. send it so that it does not occur. This location notification signal is then received only for mobile radios located within the radio zone of each fixed radio.

For example, if the mobile radio 3a is located at the position shown by the broken line, it receives only the position notification signal from the fixed radio 43, so the mobile radio 3a is
It is recognized as existing within the wireless zone 53 of No. 3. Therefore, the mobile radio device 3a transmits a location registration signal including an identification signal of the fixed radio device 43, and registers the location of the wireless zone in which it exists to the line control device 7 via the fixed radio device 43. Registration is in the form of a fixed radio identification number.

On the other hand, when the mobile radio IR 3a moves as shown by the arrow, it receives position notification signals from the fixed radios 41 and 42, but the position notification 1 word from the fixed radio 43 is received by the receiver 1.
3 becomes disabled, the mobile radio 3a is connected to the fixed line R.
41 and 42, and performs location registration with the line control device 7 in the same manner as in the previous case.

When the mobile radio IJa 3 a/3 e makes a call, it transmits the identification signal of the registered fixed radio device in the calling signal, and starts a call with the registered fixed radio device. Set up a wireless line for.

Figure 3 shows mobile radio Il! 13a is a sequence diagram showing a wireless line setting operation when a call is made to the fixed radio device 41. First, when an off-hook operation for making a call is performed on the mobile radio device 3a, the mobile radio device 3a switches to the fixed radio device 41. A calling signal including a No. 41 identification signal is transmitted on the control channel.

When the fixed wireless 1fi 41 receives the calling signal, it transmits a designation signal for the communication channel in order to notify the idle communication channel that has been previously detected. The mobile radio 3a switches to the designated channel according to the designated signal of the call channel, and then transmits a channel switching completion signal indicating that the channel switching is completed.6 Fixed wireless fi 41 receives the channel switching completion signal. As a result, a calling signal is sent to the line control device 7, and when a calling response signal is returned, the audio circuit of the transmitter/receiver of the mobile radio 3a is turned on to enable communication. The signal is transmitted to the mobile radio*3a. On the other hand, after transmitting the call response signal, the line control device 7 closes the DC loop with the wired telephone line 6a. Thereby, the wired telephone line 6a is connected to the mobile hot wire device 3a via the line control device 7 and the fixed radio device 41, and a dial tone is sent from the wired telephone line 6a to the mobile radio fi 3a. Therefore, when a dialing operation is performed on the mobile radio device 3a, the dialing signal is sent to the wired telephone line 6a, and the other party's telephone is called via the wired telephone network.

Here, as shown in FIG. 3, when the mobile radio IR 3a receives a channel designation signal from the fixed radio 41, it checks whether or not the designated communication channel is vacant, and only if it is vacant, the mobile radio IR 3a selects a channel. Returns a switching completion signal.

However, if the designated communication channel is blocked due to the influence of incoming radio waves from mobile radios, etc., further connection operations (indicated by broken lines in Figure 3) will be stopped.
Generates a busy tone indicating that wireless line setup has failed and notifies the user.

(Problem to be Solved by the Invention) By the way, when the mobile radio device 3a is in a position where radio zones 51 and 52 in FIG. It is also registered for device 7. And a wired phone! l! When making a call to 7, one of the fixed radios in wireless zones 51 and 52 is selected and a call signal is sent. However, in the conventional connection operation, as explained in FIG. immediately generates a busy tone. Therefore, G-tones are generated even though there is a possibility of setting up a wireless line with the other fixed wireless device 42, which is a problem in that it is not desirable in terms of service to the user.

SUMMARY OF THE INVENTION An object of the present invention is to provide a call origination method for a mobile wireless device that can reduce the frequency of call failures and improve serviceability for users.

[Structure 1 of the Invention (Means for Solving the Problems) The present invention provides a method for transmitting signals while remembering that a mobile radio is located in a radio zone of at least two fixed radios or in an overlapping position. When making a call, if setting up a wireless link with the fixed wireless device in one of the wireless zones fails, a call will be made to set up a wireless link with the fixed wireless device in the other wireless zone after a predetermined period of time. It is characterized by transmitting radio waves.

(Function) There are at least two mobile radio devices! ! When making a call with the line zone memorized, if the line setting with the fixed wireless device in one wireless zone fails, the line setting with the fixed wireless device in the other wireless zone is attempted and the line setting conditions are set. If this is established, a wireless line is set up with the fixed wireless device.

(Embodiment) FIG. 1 is a sequence diagram showing an embodiment of the wireless line setting operation of the calling method according to the present invention. In the figure, the mobile radio device 3a is located at a position where radio zones 51 and 52 in FIG.
1 and 52 are written/hidden. At this time, off-hook ti +i= for making a call in the mobile radio 3a
When this is done, the mobile radio 3a selects, for example, the fixed radio 41 from among the fixed radios 41, 42 in the wireless zones 51 and 52 being recorded/obstructed, and makes a call containing the identification signal of the fixed radio a41. Transmit signal 1a. The fixed radio device 41 that has received the calling signal 1a transmits a channel designation signal.

Therefore, the mobile radio JA3A switches to the communication channel specified by the channel designation signal, but if the communication channel is occupied, it stops transmitting radio waves for a predetermined period of time without generating a busy tone, and then switches to the communication channel specified by the channel designation signal. After a lapse of time, a calling signal 1b containing an identification signal of the fixed wireless device 42 in the other wireless zone 52 is transmitted. The purpose of setting the predetermined time period is to limit the occupied time of the control channel in terms of the system. In response to this calling signal 1b, fixed wireless 1t
! When a channel designation signal is returned from 142, the mobile radio 3a switches the communication channel to the designated channel. Then, it is checked whether the communication channel is empty, and if it is empty, a channel switching completion signal is transmitted as in the conventional case, and the subsequent wireless line connection operation is performed.

Therefore, even if the line setting with one fixed wireless device 41 fails, a wireless line will be set up with the other fixed wireless R42, reducing the frequency of call failures and improving serviceability for users. do.

In addition, in FIG. 2, the system configuration is such that two wireless zones partially overlap, so the maximum number of wireless zones stored in the mobile wireless devices 3a to 3e is two, but if there are three or more wireless In a system configuration where some of the zones overlap, the number of wireless zones stored in the mobile radios @3a to 3e also increases in proportion to the number of overlapping zones. If the number of stored wireless zones is three or more, it may be configured to sequentially attempt to make a call to the fixed wireless device in each wireless zone.

[Effects of the Invention] As explained above, according to the present invention, when a mobile radio device memorizes a plurality of radio zones and makes a call, it is difficult to set up a radio line with a fixed radio device in one radio zone. Even if a call fails, it is configured to set up a wireless line with the fixed wireless device in the remaining wireless zone, reducing the frequency of call failures and improving service to users. .

[Brief explanation of the drawing]

FIG. 1 is a sequence diagram showing one embodiment of the wireless line setting operation according to the present invention, FIG. 2 is a block diagram showing the general configuration of a mobile communication system, and FIG. 3 is a sequence diagram showing the conventional wireless line setting operation. It is. 3a-3e...mobile radio equipment, 41-43...fixed radio equipment, 51-52...wireless zone, 6a-6e...
Wired telephone line, 7... line control device.

Claims (1)

[Scope of Claims] A plurality of mobile radio devices, a plurality of fixed radio devices forming radio lines between these mobile radio devices, and a plurality of fixed radio devices connected between these fixed radio devices and a plurality of wired telephone lines, a line control device that forms a communication path between the mobile radio device and a wired telephone line, and the mobile radio device can control the radio of any fixed radio device by a position notification signal transmitted from the fixed radio device. In a mobile communication system that identifies and memorizes whether the mobile radio is located in a zone, and sets up a wireless line with the memorized fixed radio when making a call, the mobile radio sets the radio of at least two fixed radios. When making a call while remembering that the zones are located at overlapping locations, if you fail to set up a wireless link with a fixed wireless device in one of the wireless zones, the call will be made after a predetermined period of time. A calling method for a mobile wireless device characterized by transmitting radio waves for setting up a wireless line with a fixed wireless device in the other wireless zone.