JPH01238328A - Radio channel switching system for mobile radio equipment - Google Patents

Abstract

PURPOSE:To prevent a mobile station from interrupting communication even if all radio channels of a radio base station are in busy by assigning priority to each mobile station in advance and giving the priority to the radio channel of a radio zone of a mobile destination to the mobile station based on the said priority. CONSTITUTION:If a mobile station 5-1 moves from a radio zone 2-3 to a radio zone 2-2, a control station 3 sends a mobile destination decision signal representing that the mobile station 5-1 is moving to the radio zone 2-2 to the radio base station 1-2 having the said radio zone 2-2. Then the control station 3 discriminates whether or not the radio channel of the radio base station 1-2 is idle based on the communication control between the control station 3 and the radio base station 1-2. In case of busy, the control station 3 discriminates to which of the mobile station 5-2 located in the radio zone 2-2 and the mobile station 5-1 moving to the radio zone 2-2 the priority is to be given. Thus, a trouble of interrupting communication without any possibility is avoided.

Description

DETAILED DESCRIPTION OF THE INVENTION OBJECTS OF THE INVENTION (Field of Industrial Application) The present invention relates to a wireless channel switching scheme for mobile thermal mvtets.

(Prior Art) This type of mobile S-less device is equipped with a plurality of wireless base stations each having a wireless zone, and a plurality of mobile stations that move in these wireless zones. Communication is performed in the wireless zone using the wireless channel of the wireless base station, and the communication network is connected through the wireless base station. When the mobile station moves to the destination wireless zone,
The communication is continued by switching to the II channel of another radio base station having the radio zone.

However, conventionally, when all the wireless channels of a wireless base station are blocked, a mobile station in communication that has moved to the wireless zone of this M, line base station cannot stay in the wireless zone because there are no free wireless channels. Unable to switch wireless channels. For this reason, this mobile station had no choice but to interrupt communication even when it was in the middle of very important communication.

For example, even people designated as important people using this mobile radio device sometimes have their calls cut off midway through.

(Problem to be Solved by the Invention) As described above, in the conventional mobile Sless device, when all the radio channels of a radio base station are blocked, a communicating mobile station that has moved into the radio zone of this radio base station cannot switch wireless channels in the wireless zone,
There was a problem in that communication had to be interrupted indiscriminately.

Therefore, the present invention proposes a mobile heat 5WAW1 system that is capable of giving priority to a wireless channel to a communicating mobile station that has moved to this wireless base station even when all the wireless channels of an S-less base station are blocked. The purpose is to provide a wireless channel switching method.

[Structure of the invention]

(Means for Solving the Problems) The present invention includes a plurality of wireless wireless base stations and a plurality of mobile stations that move in each wireless zone of these wireless wireless base stations, and the mobile stations are connected to other mobile stations. ! When moving to the wireless zone of the i1 base station, a mobile radio @ switches from the wireless channel of the source wireless zone to the wireless channel of the destination wireless zone.
In the wireless channel switching method of the mobile station, a priority is assigned to each of the mobile stations in advance, and based on the priority, the mobile station is given priority over the wireless channel of the wireless zone to which it is moving. .

(Operation) According to the present invention, when a mobile station moves to a destination wireless zone, this mobile station is given priority over the wireless channel of the M, line zone based on the priority of the mobile station. . Therefore, this mobile station can preferentially use the wireless channel of the wireless zone if its priority is higher than the priority of other mobile stations communicating in the wireless zone.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a configuration diagram showing a mobile radio device to which an embodiment of the radio channel switching method according to the present invention is applied. Each radio base station 1-1.1-2 and 1-3 in the same figure has each radio zone 2-1.2-2 and 2-3, respectively, and also has a switching network 4 via a control station 3. are connected to each. Each mobile station 5-1 and 5-2 is mounted on a vehicle, and is located in each wireless zone 2-1 to 2-2.
If it is located at position 3, communication can be performed.

Currently, the mobile station 5-2 located in the wireless zone 2-2 is transmitting a call signal using the H and a channels of the wireless base station 1-2 that has the wireless zone 2-2. This communication signal is received by the non-#J base station 1-2, transmitted to the control station 3, and then roughly transmitted from the control station 3 to the switching network 4. The switching network 4 transmits the call signal to the terminal f16-2, which is the other party of the mobile station 5-2. Further, the call signal sent from the terminal 6-2 is transmitted to the W control station 3 via the switching network 4, and is further transmitted from the control station 3 to the wireless control station 3! It is transmitted to base station 1-2. The radio base station 1-2 transmits the call signal to the mobile station 5-2 through the radio channel of the radio base station 1-2. Therefore, as shown in FIG. 2, mobile station 5-2 and terminal 416
- A call is being made between the two.

On the other hand, the mobile station 5-1 located in the wireless zone 2-3 is transmitting a call signal using the wireless channel of the Imless base station 1-3 having the wireless zone.

This call signal is received by the radio base 81-3 and is sent to the control station 3.
The signal is then transmitted from the control station 3 via the switching network 4 to the terminal 6-1, which is the other party of the mobile station 5-1.

Further, the call signal sent from the terminal 6-1 is transmitted to the wireless base 81-3 via the switching network 4 and the control station 3. II base station 1-3 receives the call signal as "No!". It is transmitted to the mobile station 5-1 using the radio channel of the base station 1-3. Therefore, as shown in FIG. 2, a call is being made between the mobile station 5-1 and the terminal 6-1.

Here, when the mobile station 5-1 is moving from the wireless zone 2-3 to the wireless zone 2-2, the reception level of the 311 signal transmitted from the mobile station 5-1 is It starts to decline. At this time, the radio base station 1-3 is connected to the mobile station 5-
1, and transmits a reception level reduction signal (shown in FIG. 2) indicating this to the control station 3. In response to this reception level reduction signal, the control iI1 station 3 sends a level request signal (shown in FIG. 2) requesting detection of the reception level for the mobile station 5-1 to each S-less base station 1-1.1. -2 respectively.

Each one is free! In response to the level request signals, the base stations 1-1, 1-2 each detect the reception level of the speech signal transmitted from the mobile station 5-1.

Here, since mobile station 5-1 has moved to wireless zone 2-2, the reception level for mobile 11JF65-1 detected at wireless base station 1-2 is higher than that at wireless base station 1-1. expensive.

When each radio base station 1-1.1-2 detects the reception level of the mobile station 5-1, it sends a level notification signal (shown in FIG. 2) indicating the detected reception level to the control station 3. Transmit. Control station 3 is each Retsu! ! Base station 1-1.
Mobile station 5 indicated by the level notification signal from 1-2
Compare the respective reception levels for -1 and
It is identified that the reception level at wireless base station 1-2 is higher than that at i-base station 1-1, and based on this identification result, mobile station 5-1 moves to 811M zone 2-2. Determine. When the control station 3 makes this determination, it sends a transfer destination determination signal (shown in FIG. 2) indicating that the mobile 85-1 is moving to the wireless zone 2-2 to the wireless zone 2-2.
The information is transmitted to the non-IPJ base station 1-2 having the following information. The wireless base station 1-2 determines that the mobile station 5-1 has moved to the wireless zone 2-2 based on this destination determination signal.

Moreover, the control station 3 is not connected to the control station 3! & It is determined whether the wireless channel of the wireless base station 1-2 is free based on the communication 1Iilt11 performed with the base station 1-2.

Here, the radio channels of the radio base station 1-2 are already used by the mobile station 5-2, so they are abundant. In this case, the control station 3 controls the mobile 8 located in the wireless zone 2-2.
5-2 and mobile station 5 moving to wireless zone 2-2.
-1 to give priority to the wireless channel of the S-less base station 1-2. This determination of priority is made based on a table as shown in FIG. 3, which is stored in advance in the internal memory of the control station 3. That is, this table includes, for example, the PID (Personal I) assigned to the mobile station 5-1.
Priority level 1 is registered corresponding to number 1 of PID (abbreviation for Dentification), and priority level 1 is registered corresponding to PID number 2 assigned to mobile station 5-2.

2 are registered. Then, control station 3 has PID number 2
Since priority 1 corresponding to PID number 1 has a lower priority than priority 2 corresponding to give priority to

Next, since the control 183 has given the priority to the mobile station 5-1, the mobile station 5-2 is being used by the mobile station 5-2.
Control is performed to free up the radio channel of base station J 1-2. First, the control station 3 sends a call termination notice signal (
(shown in FIG. 2) is sent to the S-less base station 1-2 and the switching network 4. This call termination notice signal is, for example, a message urging the user to terminate the call, and is transmitted to the terminal 6-2 via the switching network 4.

As a result, the message is sounded on the terminal fl16-2 side, prompting the user to end the call. Further, this call termination notice signal is transmitted from the wireless base station 1-2 to the mobile station 5-2, and the message is thereby sounded on the mobile station 5-2 side to prompt the call to end.

After transmitting the call termination notice signal, the control station 3 measures a preset time, and the call between the mobile station 5-2 and the terminal 6-2 ends by the time this timing ends. If not, the communication path between the mobile station 5-2 and the terminal 6-2 is cut off and the communication is interrupted.

In addition, the control station 3 also controls the mobile station 5-
When the call between terminal n6-2 and terminal n6-2 ends, the call path is also disconnected. As a result, the radio channel of the radio base station 1-2 used by the mobile station 5-2 becomes available.

Next, when the wireless channel of the S-less base station 1-2 becomes vacant, the control station 3 sends a busy channel switching signal (shown in FIG. 2) to the wireless base station 1-2 to instruct it to switch to the wireless channel. -3. The radio base station 1-3 transmits this busy channel switching signal to the mobile station 5-1. When the mobile station 5-1 receives this busy channel switching signal on the wireless channel of the wireless base station 1-3, it switches from the wireless channel to the wireless channel of the wireless base station 1-2 indicated by the busy channel switching signal. .

And the mobile station 5-1 has no II! A conduction signal (shown in FIG. 2) is transmitted on the unregistered channel of the local station 1-2 to confirm that the wireless base station 1-2 is connected to the wireless base station 1-2.

No I! When the base station 1-2 receives this conduction signal, it sends the conduction signal to the control W station 3 and also sends a conduction completion signal (shown in FIG. 2) indicating that the conduction with the mobile station 5-1 is completed. is transmitted to the mobile station 5-1.

When mobile station 5-1 receives this conduction completion signal, it determines that it has completed switching from the radio channel of radio base station 1-3 to the radio channel of S-less base station 1-2.

On the other hand, when the control station 3 receives the conduction signal from the wireless base station 1-2, it connects the S-less base station 1-2 to the switching network 4 instead of the wireless base station 1-3 in response. . As a result, the radio base station 1-2 is connected to the terminal 6-1 via the control station 3 and the exchange W44, and as a result, the communication between the mobile 85-1 and the terminal 6-1 is connected to the radio base station 1-2. This can be done through

Therefore, the mobile station 5-1 in communication is in the wireless zone 2-3.
When moving to wireless zone 2-2, the mobile station 5-2 is given priority because it has a higher priority than other mobile stations 5-2 communicating in wireless zone 2-2, and the communication of other mobile stations 5-2 is given priority. By interrupting the communication, communication can be continued using the freed wireless channel.

By the way, in this embodiment, after prompting the mobile station 5-2 located in the wireless zone 2-2 to end the call, when a preset time has elapsed, the communication of the mobile station 5-2 is interrupted and the wireless channel is freed. However, instead of interrupting communication, wireless zone 2-
Mobile station 5-1, which has moved to Mobile Station 2, interrupts the radio channel used by mobile station 5-2, and takes over the radio channel by establishing an M connection with mobile station 5-2. I don't mind.

Although a voice message is used to prompt the mobile station to end the call, it is not limited to this, and the mobile station may also sound a buzzer or turn on a lamp, LED, etc. to prompt the mobile station to end the call. You can do it like this.

Furthermore, in this embodiment, the wireless base station and the greeting station communicate one-on-one, but there is no I! The present invention can be effectively applied even if a multiple access method is adopted in which an 1lIs base station and a plurality of mobile stations can communicate through their own radio channels. In this case, even if all the radio channels belonging to the radio base station are blocked, the moving mobile station has higher priority than any of the other mobile stations using these radio channels. For example, priority is given to radio channels used by other mobile stations with lower priority.

If there are a large number of mobile stations, it is recommended to allocate each priority to some of the mobile stations and grant wireless channels to some of the mobile stations based on their respective priorities. It doesn't matter.

〔Effect of the invention〕

As explained above, according to the present invention, when a mobile station moves to a destination wireless zone, this mobile station is given priority over the wireless channel of the wireless zone based on the priority of the mobile station. .

Therefore, even if all the radio channels of this radio base station are occupied, the mobile station will not interrupt communication indiscriminately.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing a pre-movement a device to which an embodiment of the wireless channel switching method according to the present invention is applied, and FIG. 2 is used to explain the operation of the embodiment shown in FIG. 3 are diagrams showing a table storing the priority of each mobile station in the embodiment shown in FIG. 1. 1-1 to 1-3... SII-free base station, 2-1 to 2-3
...Radio zone, 3...1 control station, 4...Switching network, 5-1゜5-2...Mobile station, 6-1.6-2...
Terminal. Figure 12 Figure 3

Claims (5)

[Claims] (1) A plurality of radio base stations and a plurality of mobile stations that move in each radio zone of these radio base stations are provided, and when the mobile station moves to the radio zone of another radio base station, it In a wireless channel switching method for a mobile wireless device that switches from a wireless channel in a wireless zone to a wireless channel in a destination wireless zone, a priority is assigned to each mobile station in advance,
A wireless channel switching method for a mobile wireless device, characterized in that a wireless channel is set for the mobile station within a destination wireless zone based on the priority. (2) If the priority of the moving mobile station is higher than the priority of other mobile stations communicating in the destination wireless zone, the communication of the mobile station with lower priority is interrupted and the wireless 2. The radio channel switching method for a mobile radio device according to claim 1, wherein a channel is vacated and a moving mobile station having a high priority continues communication using the radio channel. (3) If the priority of the mobile station that has moved is higher than the priority of other mobile stations that are communicating in the wireless zone of the destination, the mobile station with a lower priority is terminated and wireless 2. The radio channel switching method for a mobile radio device according to claim 1, wherein a notification is made to prompt the user to vacate a channel. (4) If the communication does not end within a predetermined time after giving a notification to the mobile station with a lower priority to urge the mobile station to end the communication and free up the wireless channel,
Radio channel switching of a mobile radio device according to claim 3, characterized in that the communication is interrupted to free the radio channel, and a moving mobile station having a high priority continues communication using the radio channel. method. (5) If the communication does not end within a predetermined time after giving a notification to the mobile station with a lower priority to urge the mobile station to end the communication and free up the wireless channel,
4. The wireless channel switching method for a mobile wireless device according to claim 3, wherein a moving mobile station having a high priority interrupts the wireless channel.