KR20000021554A - Method for performing roaming between base station controllers of subscribers in wireless local loop system - Google Patents

Abstract

PURPOSE: A methode for performing roaming between base station controllers of subscribers in wireless local loop system is provided to register a current location of a subscriber when the subscriber moves from an area of a first local exchange to an area of a second local exchange. CONSTITUTION: A methode for performing roaming between base station controllers of subscribers in wireless local loop system comprises the steps of: transferring location information of a subscriber from a subscriber connection device(132) through a corresponding base station to a second base station controller(120); allocating unused V5.2 ports(210) corresponding to a subscriber connection device(132) and requesting an unblock for the ports to a second local exchange(220); transferring a registration request message from the second base station controller to a service controller(300); requesting a removal of the subscriber information to a first local exchange(210) and removing the information; updating the subscriber information; transferring a location registration finish message from the second local exchange to the second base station controller.

Description

A roaming method between Local Exchanges for subscribers of Wireless Local Loop system

The present invention relates to a roaming method between switching stations of a wireless subscriber line network subscriber, and in particular, a subscriber who is subscribed to a wireless local area network (WLL System) currently has his or her own radio interface unit (RIU). And a roaming method for registering location information of the WLL subscriber when moving from a management area of a local exchange (LE) managing a local exchange to a area managed by another local exchange.

1 is a physical diagram of the V5.2 interface, the local exchange 200 interfaces with each access network 100 through the V5.2 protocol.

The V5.2 interface is a signaling protocol that provides a standard interface from layer 1 to layer 3 between the access network 100 and the local exchange 200, as defined in ITU-T Rec. A variety of access networks (100) that accommodate Fiber Loop Carrier System (WLL), Wireless Local Loop (WLL), Private Branch Exchange (PBX), and other remote PSTN / ISDN subscribers can be accommodated at the local switchboard (200). Open interface.

This V5.2 interface has up to 16 E1 (2,048 Kbps) links per bundle, and 32 timeslots are assigned to each E1 link. Time slots 15, 16, and 31 of each E1 link can be used as physical communication channels, timeslots not assigned to a physical communication channel can be used as bearer channels, and channel 16 on the first and second links is protected. Include a protocol.

FIG. 2 is a network diagram of the WLL system, and the WLL system forms the access network 100 of FIG. 1. In this case, when the local exchanges 210 and 220 have a V5.2 interface function, the access network 100 is connected to the corresponding local exchanges 210 and 220 through the V5.2 interface.

At this time, the subscriber access device 132 performs a wireless access function, a DM (Diagnostic Monitor) access function by connecting with PSTN or ISDN, data terminal devices, voice encoding function, tone function, 56Kbps voice for PSTN. This device performs band data and G3-Fax functions.

The base station (131, 141: Radio Part) is a device for performing the resource management, radio access function, base station controller matching function, base station operation and maintenance function, DM access function of the radio access channel and the wired link channel.

The base station controller (110, 120: Radio Part Control) has a V5.2 interface function for call processing between the local exchange 210, 220 and the base station 131, 141, automatic location registration function when moving between cells in the base station controller, voice encoding and voice data, and G3-Fax. This equipment performs subscriber traffic processing function, operation management function, base station matching and management function, and local exchange matching function.

In addition, the service controller 300 (Service Control Point) is a key element for the intelligent network service, and serves to enable the switches 210 and 220 to complete the intelligent network service. Such a service controller 300 should be able to process a large amount of transactions online in real time, and should have a structure that allows easy addition and change of services.

Meanwhile, as shown in FIG. 2, the WLL system 100 may be connected to a plurality of local exchanges 210 and 220, and each of the local exchanges 210 and 220 has its own management area. In FIG. 2, the first area exchange 210 manages the management area A 130, and the second area switch 210 and 220 manages the management area B 140.

As an example, any subscriber of management area A 130 may use a first local exchange that manages its own area through its base station 131 and base station controller 110 using its subscriber access device 132. Communicate with 210). At this time, communication is performed wirelessly between the subscriber access device 132 and the base station 131.

That is, the WLL subscriber is connected to the local exchange 210 through the subscriber access device 132, the base station 131, and the base station controller 110 in order.

In operating the WLL system 100 as described above, an area managed by another base station controller 220 outside the area 130 of the local exchange 210 in which a WLL subscriber manages its subscriber access device 132. When moving to 140, there is a need to use its own subscriber access device 132 in the moved area 140.

Accordingly, the present invention has been made in order to meet the necessity as described above, and any WLL subscriber subscribed to the WLL system 100 manages the first regional exchange 210 or 220 in which the subscriber access device 132 is managed. If the user moves out of the area 130 to the area 140 managed by the second area exchange 220, the subscriber access device 132 can be used in the moved area 140, that is, the wireless subscriber. The purpose is to provide roaming methods between switchboards of line subscribers.

In order to achieve the above object, in the roaming method of the wireless subscriber line network subscriber roaming method according to the present invention, a predetermined location registration message is transmitted from a subscriber access device moved to an area managed by a predetermined second area exchange to a corresponding base station. Handed WLL subscriber movement step; A location registration message notification step of transmitting the predetermined location registration message from a corresponding base station to a predetermined second base station controller; The second base station controller allocates a port for all subscribers corresponding to the subscriber access device among the V5.2 ports which are not currently used, and then requests an unblock for this port to the second local exchange. Allocation and unblock requirements; A roaming registration request process in which a registration request message from the second base station controller is transmitted to a predetermined service controller through the second local area switch; Deleting the subscriber information by the service controller requesting deletion of subscriber information from a predetermined first local exchange, and deleting the corresponding subscriber information by exchanging messages with the first local exchange and the first base station controller; The first regional exchange performs a block on the deleted subscriber port, and the second local exchange updates the subscriber station information and the port block; Transmitting a location registration complete message for transmitting a location registration complete message from the second local exchange to the second base station controller; And the second base station controller transmits a location registration permission message to a corresponding base station, and the base station transmits a location registration permission message for transmitting a permission message for location registration to the subscriber access device. .

In this case, the roaming registration request process may include: sending, by the second base station controller, a roaming registration request message (Registration) requesting roaming registration to the second local area exchange; The second regional exchange sending the roaming registration request message to the service controller; And sending the predetermined roaming acknowledgment message (ROAMING ACK) to the second base station controller.

In addition, the subscriber information deletion process includes the step of the service controller confirms the previous location information of the subscriber, and sends a message (Registration Can.) Requesting the location information deletion to the first local exchange; Sending, by the first local exchange, a message (Registration Can.) Requesting deletion of the location information to the first base station controller; The first base station controller transmitting a predetermined acknowledgment message (ROAMING ACK) to the first local exchange, and then performing a location deletion operation; Sending, by the first base station controller, a location information deletion completion message (Location Can.Com.) To the first local exchange; And sending a predetermined confirmation message (Registration Can. ACK) to the service controller after sending a predetermined confirmation message (ROAMING ACK) to the first base station controller. have.

The port block and subscriber information updating process may include: sending, by the first local area exchange, a message (Port block req.) To the first base station controller to perform a block operation on the deleted port; After the first base station controller blocks the corresponding ports, sending a port block completion message to the first local exchange; The service controller sending a registration ACK to the second local exchange for a corresponding subscriber registration request; And updating the information on the corresponding subscriber.

1 is a physical diagram of a V5.2 interface,

2 is a network configuration diagram of a wireless subscriber line network (WLL system),

3 is a flowchart of a roaming method according to the present invention;

4 is a detailed flowchart of a roaming method according to the present invention.

* Explanation of symbols for main parts of the drawings

100: access network 110: first base station controller

120: second base station controller 131, 141: base station

132: subscriber access device 210: first regional exchange

220: second area exchange 300: service controller (SCP)

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

3 is a schematic flowchart of a roaming method according to the present invention.

Any WLL subscriber uses his own subscriber interface 132 in the region 130 managed by the first local exchange 210 and then manages the second regional exchange 220 with the subscriber interface 132. Go to 140.

When moving to the area 140 managed by the second area exchange 220, the subscriber access device 132 transmits its location registration message. The registration message includes a location registration cause (Power Up Registration, Power Down Registration, Zone Based Registration, Registration by Reject Cause, Periodic Registration), a location identification number, and an identification number for identifying a subscriber from the subscriber access device 132. The base station 141 that has received the location registration message wirelessly transmits the location registration message to the second base station controller 120 (S315).

After receiving the location registration message from the base station 141, the second base station controller 120 examines the subscriber table. As a result of the investigation, if this subscriber does not exist, a port assignment is made to a subscriber access device 132 which has moved ports among V5.2 ports which are assigned but not used, and the second local exchange 220 for all assigned ports. Port Unblock () is requested (P320).

The second base station controller 120 registers roaming by the V5.2 protocol message with the second local exchange 220 when the second local exchange 220 recognizes the port unblock by the V5.2 control protocol procedure. Requires. At this time, the layer 3 address of the roaming registration request message uses the highest port number among the newly allocated subscriber ports.

The second local area exchange 220 that has received the roaming registration request from the second base station controller 120 requests the service controller 300 to register the location of the subscriber (P325). At this time, the service controller 300 has information such as an exchange ID and a subscriber directory (DN) for the WLL subscriber.

After checking the previous location information of the corresponding subscriber, the service controller 300 requests the first local exchange 210 to delete the location. Upon receiving the location deletion request, the first local exchange 210 requests the first base station controller 110 to delete the corresponding subscriber's information, wherein the V5.2 layer 3 address of the message for the deletion request is an existing subscriber port. Use the middle port number.

After performing the subscriber information deletion operation, the first base station controller 110 sends a location deletion completion message to the first local exchange 210. At this time, the V5.2 layer 3 address of the message for completing the deletion uses the highest port number among the existing subscriber ports (P330).

After receiving the deletion completion message from the first base station controller 110, the first local area network 210 performs a block on the deleted subscriber port, and the location deletion request from the service controller 300. Send a confirmation message.

After receiving the confirmation message from the service controller 300, the second area exchange 220 updates the corresponding subscriber information (P335). At this time, the information elements to be updated include subscriber number (IWUI: International WLL User Identity), new interface identifier, new port number, IWEI (International WLL Equipment Identity), and location area identification (LAI). Etc. are included.

When the subscriber information update is completed in the second area switch 220, the second base station controller 120 transmits a location registration completion message to the second base station controller 120 (step S340).

Then, the second base station controller 120 transmits a location registration permission message to the base station 141, and the base station 141 transmits a location registration permission message to the subscriber access device 132 (S345).

Through this process, the mobility of the WLL subscriber can be realized.

Figure 4 is a detailed flowchart of a roaming method according to the present invention, with reference to this will be described in detail the present invention.

First, in the WLL subscriber movement step (S310), any WLL subscriber uses his subscriber access device 132 in the area 130 managed by the first local exchange 210, and then managed by the second local exchange 220. It moves to the area 140 to be.

Then, the subscriber access device 132 transmits its own location registration message (Registration). The location registration message includes an identification number, a location identification number, and a location registration form for identifying a subscriber, and is wirelessly transmitted to the base station 141.

In step S315, the base station 141 transmits a location registration message (Registration) received by the base station 141 to the second base station controller 120.

In the port allocation and unblock request process (P320), the second base station controller 120 refers to the received location registration message (Registration), examines the corresponding subscriber table, and if the corresponding subscriber does not exist, the port is assigned. It allocates certain ports among the V5.2 ports not in use to the subscriber access unit 132 which has moved.

In more detail, the second base station controller 120 sends a port control message (Port Unblock Req.), Which is a request to unblock the V5.2 port allocated thereto, to the second local exchange 220. The second local exchange 220 performs an unblock for the corresponding port by a predetermined V5.2 control protocol procedure, and then port control that the port unblock was successfully performed to the second base station controller 120. Send a confirmation message (Port Unblock).

Through this process, the second base station controller 120 receives an unblocked response to the port to be used by the subscriber access device 132.

In the roaming registration request process P325, since the second local area network 220 recognizes the port unblocking, the second base station controller 120 generates a roaming registration request message (Registration) requesting roaming registration. Send to 220.

The second area exchange 220 sends this roaming registration request message to the service controller 300, and sends a roaming acknowledgment message to the second base station controller 120.

In the subscriber information deletion process (P330), after checking the previous location information of the corresponding subscriber, the service controller 300 sends a message (Registration Can.) Requesting deletion of the location information of the corresponding subscriber to the first local exchange 210. The first local exchange 210 sends a message (Registration Can.) Requesting deletion of location information to the first base station controller 110 again. At this time, as mentioned above, the V5.2 layer 3 address of the message for deletion request uses the highest port number among existing subscriber ports.

Now, the first base station controller 110 sends a confirmation message (ROAMING ACK) for the location information deletion request message of the subscriber to the first local exchange 210, and performs the location information deletion operation. When the location information deletion ends, the location information deletion completion message (Location Can.Com.) Is sent to the first local exchange 210. At this time, the V5.2 layer 3 address of the location information deletion complete message uses the highest port number among the existing subscriber ports.

Then, the first regional exchange 210 sends a confirmation message (ROAMING ACK) that the location information deletion completion message well received to the first base station controller 110, and then the location information deletion operation for the subscriber to the service controller 300 Sends a message (Registration Can.ACK) indicating that this has been completed.

In the port block and subscriber information update process (P335), the first local area network 210 sends a message (Port block req.) To perform a block operation on the deleted port to the first base station controller 110, The base station controller 110 accordingly blocks the corresponding ports, and then sends a port block completion message (Port block) to the first local exchange 210.

On the other hand, after the service controller 300 receives the message of the completion of the location information deletion from the first regional exchange 210, and sends a response (Registration ACK) to the registration request of the subscriber to the second regional exchange 220 In response to this message, the second regional exchange 220 updates the information on the subscriber.

In the location registration complete message transmission step (S340), after the subscriber information update is completed, the second local exchange 220 transmits a location update complete message (Location Update Com.) To the second base station controller 120, and then the second base station 220. The controller 120 sends a confirmation message ROAMING ACK to the second local exchange 220 indicating that it received a location update com.

In operation S345, the second base station controller 120 transmits a permission message for registration of the location to the corresponding base station 141, and the base station 141 is again connected to the subscriber. In step 132, a permission message for registration of a location is transmitted.

Through the above procedure, the location of the WLL subscriber who has moved from one area to another area is identified and registered at the local exchange, so that the mobility of the WLL subscriber can be realized. It becomes possible to plan.

As described above, when using the roaming method according to the present invention, any WLL subscriber subscribed to the WLL system leaves the area of the local exchange 210 where the subscriber access device 132 is managed. Even when the mobile station 220 moves to the area managed by the user, the subscriber access device 132 can be used.

Therefore, it is possible to realize the roaming of the WLL subscriber, thereby widening the use range of the subscriber access device of the WLL subscriber, and thus, the convenience of the WLL user is provided.

Claims (4)

When the subscriber access device 132 in the management area 130 of the predetermined first area exchange 210 is moved to the management area 140 of the predetermined second area exchange 220, the first area exchange 210 is located. In the method of registering the current location of the subscriber access device 132 through a predetermined service controller 300 is commonly connected to the second area exchange 220, the second area exchange 220 is managed. A WLL subscriber movement step of transmitting a predetermined location registration message to the base station 141 from the subscriber access device 132 which has moved to the region of interest; A location registration message notification step of transmitting the predetermined location registration message from the base station 141 to the corresponding second base station controller 120; The second base station controller 120 allocates a port for all subscribers corresponding to a subscriber access device among V5.2 ports that are not currently used, and then unblocks the port to the second local exchange 220. Port assignment and unblock request process requiring Unblock); A roaming registration request process in which a registration request message from the second base station controller 120 is transmitted to the service controller 300 through the second local area network 220; The service controller 300 requests deletion of subscriber information to the first local exchange 210, and the first local exchange 210 and the corresponding first base station controller 110 exchange corresponding subscriber information with each other. Deleting subscriber information to be deleted; The first regional exchange 210 performs a block on the deleted subscriber port, and the second local exchange 220 updates the subscriber station information and the port block; A location registration completion message transmitting step of transmitting a location registration completion message from the second local exchange 220 to the second base station controller 120; And The second base station controller 120 transmits a location registration permission message to the base station 141, and the base station 141 transmits a location registration permission message to transmit a permission message for location registration to the subscriber access device 132. Roaming method between the base station controller of the wireless subscriber line network subscriber comprising a transmitting step. The method of claim 1, wherein the roaming registration request process comprises: sending, by the second base station controller (120), a roaming registration request message (Registration) requesting roaming registration to the second local area network (220); Sending, by the second regional exchange (220), the roaming registration request message (Registration) to the service controller (300); And The second area switch 220 is configured to include a step of sending a predetermined roaming acknowledgment (ROAMING ACK) to the second base station controller 120 roaming method between the base station controller of the wireless subscriber line network subscriber . The method of claim 1, wherein the deleting of the subscriber information comprises: a message for requesting deletion of location information from the first local exchange 210 after the service controller 300 checks the previous location information of the corresponding subscriber. Sending; Sending, by the first local exchange (210), a message (Registration Can.) Requesting deletion of the location information to the first base station controller (110); The first base station controller (110) sending a predetermined confirmation message (ROAMING ACK) to the first local exchange 210, and then performing a location deletion operation; Sending, by the first base station controller (110), a location information deletion completion message (Location Can. Com.) To the first local exchange 210; And The first regional exchange 210 sends a predetermined confirmation message (ROAMING ACK) to the first base station controller 110, and then sends a predetermined subscriber information deletion completion message (Registration Can. ACK) to the service controller 300. Roaming method between the base station controller of the wireless subscriber line network subscriber comprising a sending step. The method of claim 1, wherein the updating of the port block and subscriber information comprises a message for the first local area network 210 to perform a block operation on the deleted port to the first base station controller 110 (Port block req.). Sending; Blocking the corresponding ports by the first base station controller (110), and then sending a port block completion message (Port block) to the first local exchange 210; The service controller (300) sending a predetermined response message (Registration ACK) to the second local exchange (220) for a corresponding subscriber registration request; And The second regional exchange 220 is roaming method between the base station controller of the wireless subscriber line network subscriber, characterized in that it comprises the step of updating the information for the subscriber.