JPH04249432A - Radio line setting method - Google Patents

Abstract

PURPOSE:To set the optimum radio line by making a difference between a value of setting a receiving level for a radio line connecting a mobile radio apparatus and a fixed radio apparatus and a value of setting a receiving level for disconnecting the mobile radio apparatus and the fixed radio apparatus to discriminate the setting or the disconnection of the radio line between them. CONSTITUTION:Fixed radio apparatuses 3a-3n are connected to switch 1 that is connected to a communication network via wire line. Here, a mobile radio apparatus 4 sets radio lines between the mobile radio apparatus 4 and fixed radio apparatuses 3a-3n that sent a response signal thereto, and if there are a plurality of response signals, the sent relevant response signals are selected from radio apparatuses 3a-3n. Further, when a receiving level drops and trouble occurs with communication as the radio apparatus 4 moves, the radio apparatus 4 disconnects the radio lines. Further, radio apparatuses 3a-3n that received radio wave sent from the radio apparatus 4 detect whether or not a receiving level exceeds a threshold level. The radio apparatus 4 sets up a radio line with one of radio apparatuses 3a-3n that detected a call and sent a response signal earliest. Now, by making a difference between a receiving level setting value for setting a radio line and a setting value for disconnecting the radio line, the optimum radio line is set up regardless of the presence or absence of a control station.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio line setting system, and is useful when applied to a mobile communication system having a plurality of fixed radio devices and a plurality of mobile radio devices.

0002

2. Description of the Related Art FIG. 2 is a block diagram showing a prior art mobile communication system having a plurality of fixed radios and a plurality of mobile radios. In the figure, 1 is an exchange, 2 is a control station, 3a, 3b, . . . , 3n are fixed radio devices, and 4 is a mobile radio device (only one is shown in the figure). The exchange 1 is connected to a communication network (not shown) via a wired line. Each of the fixed wireless devices 3a to 3n is connected to the exchange 1 via a wired line and a control station 2, respectively.

[0003] In the above mobile communication system, the radio lines between the mobile radio device 4 and the fixed radio devices 3a to 3n are set up as follows.

[0004] A mobile radio device 4 moving within a service area constituted by fixed radio devices 3a to 3n sends a radio wave signal requesting line connection to the fixed radio devices 3a to 3n when setting up a radio line. Send. The fixed radio devices 3a to 3n that received the radio signal inform the control station 2 of the fixed radio device 3a to 3n that there has been a line connection request from the mobile radio device 4, and the reception level of the radio signal at that time. Notify.

[0005] In the control station 2, a plurality of fixed radio devices 3a
When the control station 2 is notified of a connection request for the same mobile radio device 4 from ~3n, the control station 2 compares the reception levels and selects the fixed radio device to be connected. That is, the fixed wireless devices 3a to 3n that have notified the highest reception level are determined to be the fixed wireless devices for setting up the wireless line.

[0006]

[Problems to be Solved by the Invention] The above-mentioned prior art has the following problems.

■ Control by the control station 2 is required. (2) When the number of mobile radio devices 4 or traffic increases in order to compare reception levels at the control station 2, the control station 2 becomes overloaded.

SUMMARY OF THE INVENTION In view of the above-mentioned prior art, it is an object of the present invention to provide a wireless line setting method that allows a fixed wireless device and a mobile wireless device to control the setting and disconnection of a wireless line between the two.

[0009]

[Means for Solving the Problems] The structure of the present invention that achieves the above object is as follows:

[0010] An exchange that is connected to a communication network via a wired line, a plurality of fixed wireless devices each connected to this exchange via a wired line, and a system that selectively connects these fixed wireless devices via a wireless line. This is a wireless line setting method for a mobile communication system having a plurality of mobile radios connected to a mobile radio, in which determination of whether to set up or disconnect a radio link between the mobile radio and each fixed radio is made based on radio waves in each fixed radio. It is characterized in that this is done based on the reception level, and the reception level for determining setting is set higher than the reception level for determining disconnection.

[0011]

[Operation] According to the present invention having the above configuration, the fixed radio device that receives the radio waves transmitted by the mobile radio device establishes a radio line between the mobile radio device and the mobile radio device based on the reception level of the radio waves. It is determined whether the level is such that it is possible to do so, and whether the level is such that the set wireless line should be disconnected.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described below in detail with reference to the drawings.

Each fixed radio device 13a to 13n in FIG.
is connected to a switchboard that is connected to the communication network via a wired line.
Each is connected via a wired line. When these fixed wireless devices 13a to 13n receive a line connection request from the mobile wireless device 14, they measure the reception level in the same manner as in the past. If the reception level at this time exceeds the preset threshold level, the fixed radio equipment 13a~
13n transmits a response signal to the mobile radio 14. When it is below the threshold level, fixed radio equipment 13a~
13n does not transmit a response signal.

[0014] The mobile radio device 14 establishes a radio line with the fixed radio devices 13a to 13n that have transmitted the response signal. When the mobile radio device 14 receives a response signal from a plurality of fixed radio devices 13a to 13n, the mobile radio device 14 receives response signals from a plurality of fixed radio devices 13a to 13n,
Fixed wireless device 13a (fixed wireless device that returned the response the fastest)
Select ~13n. Multiple fixed wireless devices 13a to 13n
Even if the fixed wireless device 13a to 13n returns a response, it does not matter which fixed wireless device 13a to 13n is selected because it is the fixed wireless device 13a to 13n that is at or above the threshold level.

[0015] After the radio line is set up, the reception level decreases as the mobile radio device 14 moves. When the reception level drops to such a level that it interferes with communication, the wireless line is disconnected, but the level at the time of disconnection is set lower than the level at the time of connection, as described above.

According to the above-mentioned embodiment, the fixed radio devices 13a to 13n that received the radio waves transmitted by the mobile radio device 14,
It is detected whether or not the received level of the radio wave exceeds a threshold level, and when the received level exceeds the threshold level, communication is performed with the fixed radio equipment 13a to 13n that detected this the earliest and transmitted the stress signal. The mobile radio device 14 sets up a radio line between the two stations.

On the other hand, if the reception level at the time of disconnection is lower than the reception level at the time of setting, the set wireless line is disconnected.

[0018]

As described above in detail with the embodiments, according to the present invention, a fixed wireless device and a mobile wireless device determine whether to set up or disconnect a wireless line between the two, and
Since there is a difference in the set value of the reception level at the time of setting and disconnection, the following effects are achieved.

[0019] ■ Eliminating the need for control by a control station when setting up a wireless line. ■ The wireless line can always be set as long as the determined reception level satisfies a predetermined condition. Therefore, when setting up a line, it is possible to select a more optimal wireless line setting target.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a block diagram showing a prior art.

[Explanation of symbols]

13a to 13b,...13n Fixed radio device 14 Mobile radio device

Claims (1)

[Claims] Claim 1: An exchange connected to a communication network via a wired line, a plurality of fixed wireless devices each connected to this exchange via a wired line, and a communication network for these fixed wireless devices via a wireless line. A wireless line setting method for a mobile communication system having a plurality of mobile radio devices that are selectively connected, the method comprising:
The setting and disconnection of wireless lines between the mobile radio device and each fixed radio device are determined based on the reception level of radio waves at each fixed radio device, and the reception level used to determine the setting is used to determine whether to disconnect. A wireless line setting method characterized by setting the level higher than the level.