KR970008672B1 - Radio private exchanger - Google Patents

Abstract

The zone switching method between radio private exchanges is capable of maintaining a speeching state, even through a portable device during conversation within zone of a predetermined radio private exchange is moved to the zone of other radio private exchange. The zone switching method comprises the steps of: if the portable device is moved to the zone of a fixed device involved within a second system controller from the zone of a fixed device within a first system controller, sending a zone switching request message; transmitting the zone switching request message to the first and second system controllers sides; comparing the messages to select the fixed device having relative good field strength; transmitting zone switching request information to the first system controller; and if the field strength of the second system controller is higher than that of the first system controller, transmitting a zone switching response message to the second system controller and connecting a speech path to the second system controller, to thereby maintain a speeching state with the portable device.

Description

Zone transfer method of wireless private exchange period

1 is a block diagram of a conventional wireless private exchange.

2 is a view for explaining a zone transfer process of a conventional wireless private exchange.

3 is a diagram illustrating a message format used in zone switching of a conventional wireless private exchange.

4 is a block diagram of a wireless private exchange in accordance with the present invention.

5 is a view for explaining a zone transfer process of a wireless private exchange in accordance with the present invention.

6 is a flowchart illustrating a zone switching process of a wireless private exchange in accordance with the present invention.

* Explanation of symbols for main parts of the drawings

10, 30, 40: system control apparatus 11a-11n, 35a-35n, 45a-45n: fixed apparatus

12a-12n, 50a-50n: Portable device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless private exchange, and in particular, a zone switching method of a wireless private exchange during which a mobile device in a call in a zone of a predetermined wireless private exchange moves to a zone of another wireless private exchange. It is about.

The conventional wireless private exchange includes a system control device 10, a plurality of fixing devices 11a to 11n, and a plurality of portable devices 12a to 12n, as shown in FIG. The system controller 10 and the fixing devices 11a to 11n are interconnected via wired communication paths, and the fixing devices 11a to 11n communicate with the portable devices 12a to 12n located in their zones through a wireless channel. do. The fixing devices 11a to 11n transfer the message received from the portable devices 12a to 12n to the system controller 10 and the message supplied from the system controller 10 to the portable devices 12a to 12n. do. The system controller 10 sets not only a communication path between each of the portable devices 12a to 12n and the public network, but also sets an extension communication path between each of the portable devices 12a to 12n.

Since the electric field area of each of the fixing devices 11a to 11n is limited within a certain distance, each of the portable devices 12a to 12n can talk only within the electric field area of the fixing devices 11a to 11n. In FIG. 2, the fixing device 11a is capable of communicating with the portable device in the zone Z1, the fixing device 11b is capable of talking with the portable device in the zone Z2, and the fixing device 11c is in the zone. Talk to the handheld device in (Z3) is possible. For example, when the portable device 12a moves from the point A in the zone Z1 through the fixing device 11a to the point C via the point B, the mobile device 12a moves to the point C in the zone Z1. When the point B, which is the outer part, is reached, the communication state with the fixing device 11a is not good, and the zone transfer message of the form shown in FIG. 3 (a) is broadcast to the adjacent fixing device. At this time, the adjacent fixing devices receive the zone transfer message from the portable device 12a and transfer the same to the system controller 10 in the form of FIG. 3 (b). The system controller 10 receives the zone transfer message from the fixing device and sets the call path to the fixing device having the best electric field strength. In FIG. 2, the electric field strength of the fixing device 11b becomes the best, so that the fixing device ( The communication path with 11a) is disconnected and the communication path is set to the fixing device 11b. Accordingly, the portable device 12a continues to talk through the fixing device 11b.

Such a conventional wireless private exchange can be set as a call for a mobile device moving in a zone under its jurisdiction, but when a mobile device in a call moves into a zone of another wireless private exchange, a call path cannot be established. There is a problem that the area cannot be extended.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and when the mobile device in a call moves to a zone of another wireless private exchange, the call service area is expanded to reset the call path for the mobile device in the call. An object of the present invention is to provide a method for zone switching of a wireless private exchange.

In order to achieve the above object, the present invention provides that the field strength level is increased while the portable device in the call moves toward the zone of the fixed device belonging to the second system controller in the zone of the fixed device belonging to the first system control device. A first step of sending a zone transfer request message to adjacent fixed devices when the level is lowered below a predetermined level; when the fixed device receives a zone transfer request message, the zone transfer request message is sent to the first and second system controllers to which it belongs. A second process of transmitting a second process, and a third process of selecting a fixing device having the best electric field strength by comparing the zone transfer request message supplied from the fixing device belonging to the first and second system controllers; A fourth step of transmitting, by the system controller, the zone transfer request information to the first system controller in communication with the portable apparatus; Receive the transfer request information and compare the electric field strength of the second system controller with the electric field strength of the second system controller, and if the electric field strength of the second system controller is greater than the electric field strength of the second system controller, transfer the zone between systems to the second system controller. A fifth step of transmitting a response message and connecting a call path to the second system controller and maintaining a call state with the portable device; when the second system controller receives the zone transfer response message between the systems; Transmitting a zone transfer response confirmation message between systems to the first system controller; when the first system controller receives the zone transfer response confirmation message between the systems, releases the call state to the mobile device and The seventh process of recording the movement of the portable device on the VLR and the second system control device responds to the zone transfer between the systems. And an eighth step of transmitting a zone transfer response message between systems to the fixed device selected by the user after sending the response confirmation message to make a call with the portable device and recording the movement of the portable device on his VLR. A zone switching method of a wireless private exchange period is provided.

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

4 is a configuration diagram of a wireless private exchange according to the present invention, FIG. 5 is a view for explaining a zone transfer process of the wireless private exchange according to the present invention, and FIG. 6 is a zone transfer process of the wireless private exchange according to the present invention. It is a flow chart showing.

As shown in FIG. 4, the wireless private exchange in accordance with the present invention includes a plurality of system controllers 30 and 40, a plurality of fixing devices 35a to 35n, 45a to 45n, and a plurality of portable devices 50a to 50n. It is provided with a dedicated line (L) for transmitting zone transfer information and connecting the call path between the system control device (30, 40) between each other.

The zone transfer process of the present invention will be described with reference to FIG. 5 and FIG. For example, while the portable device 50a is talking through the fixing device 35n at the point A of the zone Zn managed by the system controller 30 (step S1), the point B is transferred. When moving to the point (C) side, the call quality is reduced when the point (B), which is the outer portion of the zone (Zn), the mobile device 50a checks the electric field strength during the call to fall below a predetermined level If so, the zone transfer request message is returned to the adjacent fixing device (step S2). When adjacent fixing devices (35n _-1 , 35n, 45, 45b) receives the zone transfer request message, the identification number, the system controller number belonging to the mobile device, The zone transfer request message including the channel number, the stationary device number, and the electric field strength information is sent. The stationary device 35n maintains the busy state with the mobile device 50a (step S3) and the system transfer device requests the system transfer device. (30), the fixing device 35n- ₁ sends the zone transfer request message to the system controller 30 (step S5), and the fixing unit 45a sends the zone transfer request message to the system control unit 30. The control unit 40 is sent out (step S6), and the fixing unit 45b sends out a zone transfer request message to the system control unit 40 (step S7). At this time, the system controller 30 determines the optimum fixing device 35n by comparing the zone transfer request messages supplied from the fixing devices 35n- ₁ , 35n, and the system controller 40 is the fixing device 45a. The optimum fixing device 45a is determined by comparing the zone transfer request messages supplied from 45b). The system controller 40 determines the fixing device 45a, and then passes through the dedicated line L to the system control device 30 that is in communication with the mobile device 50a. The system control device number, the fixing device number, and the mobile device number And zone change request information including field strength information (step S8). Accordingly, the system controller 30 compares the information between the systems, and the electric field strength of the fixing device 45a determined by the system controller 40 is greater than the electric field strength of the fixing device 35n determined by the system controller 30. Then, while maintaining the busy state between the fixing device 35n and the portable device 50a (step S9), the zone transfer response message between systems is transmitted to the system control device 40 via the dedicated line L ( Step S10), the mobile device 50a is connected to the call path for the other party on the line through the dedicated line L to the system controller 40 (step S11), and the fixing device 35n and the mobile device 50a are connected. The call state between them is maintained (step S12). When the system controller 40 receives the inter-system zone transfer response message from the system controller 30, the system controller 40 transmits the zone transfer response confirmation message between the systems to the system controller 30 via the dedicated line L (step S13). ). At this time, the system controller 30 releases the call state between the fixed device 30n and the portable device 50a (step S14), and registers the movement of the portable device 50a with its own VLR (Visitor Location Register). (Step S15). Further, the system controller 40 transmits the inter-system zone transfer response confirmation message to the system controller 30, and then sends the inter-system zone transfer response message to the fixing device 45a side (step S16). The movement of the portable apparatus 50a is registered in its own VLR (step S17). At this time, the portable apparatus 50a continues to talk through the fixing apparatus 45a (step S18).

In addition, when the mobile device in the call in the zone of the system control device 40 moves to the zone of the system control device 30, the zone transfer is performed through the same process as described above.

In the above, the case of zone transfer between two wireless private exchange systems has been described. However, the present invention is not limited thereto and may be usefully applied even when two or more wireless private exchange systems are interconnected.

As described above, according to the present invention, when the mobile device in a call moves to a zone of another wireless private exchange, the call path for the mobile device is reset, thereby effectively extending the call service area.

Claims (1)

In a wireless private exchange, the field strength level drops below a predetermined level while the portable device in the call moves toward the zone of the fixed device belonging to the second system controller in the zone of the fixed device belonging to the first system control device. A first process of sending a zone change request message to adjacent fixed devices, and if the fixed device receives the zone transfer request message, transmitting the zone transfer request message to the first and second system controllers to which the fixed device receives the zone transfer request message. And a third step of selecting the fixed device having the best electric field strength by comparing the zone transfer request message supplied from the fixed device belonging to the first and second system control devices. A fourth process of transmitting zone transfer request information to a first system controller in communication with a device, wherein the first system controller sends the zone transfer request information to the first system controller; Receives and compares the electric field strength of the second system control device with its own electric field strength and transmits a zone transfer response message between systems to the second system control device if the electric field strength of the second system control device is greater than its electric field strength. And a fifth process of connecting a call path to the second system controller and maintaining a call state with the portable device, and when the second system controller receives the zone transfer response message between the systems, controlling the first system. A sixth step of transmitting an intersystem transfer response acknowledgment message to a device side; when the first system controller receives the intersystem transfer response acknowledgment message, release the call state to the portable device and carry the portable unit to its own VLR. A seventh step of recording the movement of the device, and the second system controller sends a zone transfer response confirmation message between the systems; And transmitting an zone transfer response message between systems to a fixed device selected by the user after the transmission, to make a call with the portable device, and to record the movement of the portable device on his / her VLR. Zone transfer method of private exchange.