KR20020004617A - Method for treating reject of deallocation in local exchange using v5.2 protocol - Google Patents

Abstract

PURPOSE: A method for processing the rejection of a resource release request in an LE(Local Exchange) according to a V5.2 protocol is provided to make resource release normally done in real time, even in case that an LE receives a release request rejection message for a resource release request message transmitted to an AN(Access Network). CONSTITUTION: If an LE(100) sends a resource allocation request message(ALLOC) containing port information(port A) and time slot information(time slot B) to an AN(102)(300), the AN transmits an allocation response message(ALLOC_COMP) to the LE so that resource allocation can be made(302). Afterwards, the LE sends a resource release request message(DE_ALLOC) to the AN(304) in order to release the time slot resource(304). If the AN transmits a release request rejection message(DE_ALLOC_REJ) in response to the resource release request message(306), the LE sends an audit message containing port information(port A) to the AN(308). Also the LE sends an audit message containing time slot information(time slot B) to the AN(310). However, in case that time slots C and B are connected to ports A and D respectively, the AN sends an audit response message containing the information of port A and the information of time slot C and an audit response message containing the information of port D and the information of time slot B to the LE(312,314). After confirming each time slot information and port information, the LE sends a resource release request message(DE_ALLOC) containing the information of port A and the information of time slot C and a resource release request message(DE_ALLOC) containing the information of port D and the information of time slot B to the AN(316,318). In response to the resource release request messages(DE_ALLOC), the AN sends resource request response messages(DE_ALLOC_COMP) to the LE(320,322).

Description

METHODS FOR TREATING REJECT OF DEALLOCATION IN LOCAL EXCHANGE USING V5.2 PROTOCOL}

The present invention relates to a local exchange and an access network interworked by V5.2, that is, a V5.2 interface. In particular, the present invention relates to an access network for resource release request according to the V5.2 protocol of a local exchange. It is about how to deal with the rejection.

The V5.2 interface provides the interworking standard of the local exchange (hereinafter referred to as "LE") and the access network (hereinafter referred to as "AN"). This is as recommended in International Telecommunication Union-Telecommunication Standardization Sector (ITU-T) Recommendation G.965. The V5.2 interface applies to the digital local exchange LE and the subscriber network AN.

The V5.2 protocol is a signaling protocol between LE and AN and consists of five subprotocols. These five subprotocols are the Public Switched Telephone Network (PSTN) protocol, control protocol, link control protocol, bearer channel control (BCC) protocol, and protection protocol. Among these subprotocols, the BCC protocol is a protocol for allocating or freeing time slots on a V5.2 interface. The BCC protocol is an allocation process, a de-allocation process, and an audit process. It supports three processes. The allocation process is a process for allocating a bearer channel, the deassignment process is a process for releasing an assigned bearer channel, and the audit process is a process for checking a connection of a bearer channel.

Resource allocation and release processing between the LE and the AN according to the BCC protocol will be described with reference to FIGS. 1 and 2. FIG. 1 shows that the LE 100 and the AN 102 are interworked by the V5.2 interface, and FIG. 2 shows the resource allocation and release processing procedure between the LE 100 and the AN 102 of FIG. 1.

First, in step 200 of FIG. 2, when the LE 100 loads port information Port_id and time slot information time-slot in the resource allocation request message ALLOC requesting allocation of resources in the time slot, the AN 100 transmits the AN 102. 102 assigns a time slot with the port information Port_id included in the resource allocation request message ALLOC and the time slot information time-slot. In step 202, the resource allocation is determined by transmitting the allocation response message ALLOC_COMP to the LE 100. Is done.

In such a state, when the LE 100 intends to release a resource of a time slot being used, the resource release request message DE_ALLOC including the port information Port_id and the time slot information time-slot is transferred to the AN 102 as shown in step 204. Send. Then, AN 102 checks whether the time slot connected to the port indicated by the port information Port_id matches the time slot indicated by the time slot information time-slot, or the port connected to the time slot indicated by the time slot information time-slot is assigned to the port information Port_id. Make sure it matches the port you point to. In the resource management, since the AN 102 and the LE 100 may be different from each other, the port information and time slot information at the time of resource allocation request do not necessarily match the resource release request. However, since the master of resource management is the LE 100, the LE 100 itself has priority over the request for release. As a result of the confirmation, if it is matched, the AN 102 transmits a normal release request response message for the resource release request to the LE 100 so that normal resource release is performed. Otherwise, if a mismatch occurs, the AN 102 transmits the cause of rejection to the release request reject message DE_ALLOC_REJ to the LE 100 in step 206.

The cause of the rejection may be various, but the cause of the rejection, which may occur frequently, is that the port information is incorrect, the time slot information is incorrect, or both the port information and the time slot information are not identical.

As such, when the LE 100 does not receive a normal response from the AN 102 and receives the release request reject message DE_ALLOC_REJ as in step 206, the LE 100 first determines what is causing the rejection. If the cause of the rejection is incorrect port information or wrong time slot information, processing is easy.

For example, if the cause of the rejection request rejection is that the time slot information matches but the port information is wrong, the LE 100 transmits the time slot information to the audit message to the AN 102. The AN 102 then transmits the port information connected to the time slot indicated by the time slot information of the audit message to the LE 100 in the audit response message, whereby the LE 100 includes a port included in the audit response message. A release request message is sent to the AN 102 with information and time slot information to release resources. On the contrary, if the cause of the rejection request rejection is that the port information matches but the time slot information is incorrect, the LE 100 transmits the port information to the AN 102 with the audit message. The AN 102 then transmits to the LE 100 the time slot information connected to the port indicated by the port information of the audit message in the audit response message, which the LE 100 sends to the port information contained in the audit response message. Releases the resource by sending a release request message to the AN 102 with time slot information.

However, if the cause of the resource release refusal is that the port and the time slot do not all match, the LE 100 does not send an audit message and merely informs the operator of the situation and the cause of the refusal as shown in step 208 of FIG. .

As a result, time slot resources are not released normally and the database is not properly managed. This means that the information of the resources of the LE 100 and the AN 102 do not coincide with each other, resulting in a failure to process the call normally.

Accordingly, an object of the present invention is to receive a release request rejection message caused by a mismatch between a port and a time slot for a resource release request message sent to AN to release resources of a time slot being used by LE. The present invention provides a resource release request rejection processing method that can release resources normally in real time.

1 is a system configuration diagram linked by V 5.2 interface,

2 is a flowchart illustrating a process of allocating and releasing resources between a local exchange and an access network;

3 is a resource allocation and release processing procedure between a local exchange and an access network according to an embodiment of the present invention;

4 is a flowchart illustrating a resource release request rejection process of a local exchange according to an embodiment of the present invention;

In order to achieve the above object, the present invention provides a first audit message including port information included in a resource release request when the LE receives a release request rejection message that causes both a port and a time slot to be inconsistent. A second audit message carrying time slot information included in the resource release request is transmitted to the AN. Thereafter, in response to the first audit message, a resource release request message including port information and timeslot information in the audit response message received from the AN is transmitted to the AN, and the audit response message received from the AN is responded to in response to the second audit message. Resource release request message including port information and time slot information is sent to AN for resource release.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description and the annexed drawings, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

3 illustrates a resource allocation and release processing procedure according to an embodiment of the present invention between the LE 100 and the AN 102 of FIG. 1 described above. The LE 100 sends a resource allocation request message ALLOC to the AN 102 with the port information as the port A and the time slot information as the time slot B in step 300, and the AN 102 responds in step 302. The resource allocation is made by sending an allocation response message ALLOC_COMP to the LE 100 at.

In the above state, the AN 100 rejects the release request from the AN 102 for transmitting the resource release request message DE_ALLOC including port information and time slot information to the AN 102 in order to release the resources of the time slot being used. When the message DE_ALLOC_REJ is received, the LE 100 checks the cause of rejection and processes according to the type of the cause of rejection.

The resource release request rejection process of the LE 100 will be described with reference to the flowchart of FIG. 4 shown in steps 400 and 414. When the LE 100 receives the release request rejection message from the AN 102 in step 400, the LE 100 checks the cause of the rejection in steps 402 to 406. According to the V5.2 protocol, the AN 102 transmits the cause of rejection to '10001000' when the port information is incorrect, and the cause of rejection to the '10001001' when the time slot information is incorrect. If the slot information does not all match, the cause of rejection is transmitted to '10000111'.

If the cause of rejection is '10001000', the LE 100 transmits an audit message including port information to the AN 102 at step 408. If the cause of rejection is '10001001', the LE 100 at step 410 An audit message carrying time slot information is sent to the AN 102. On the contrary, if the cause of rejection is '10000111', the LE 100 transmits an audit message including port information and an audit message including time slot information to the AN 102 in step 412, '10001000', '10001001', If it is other than '10000111' in step 414, the operator is notified of the rejection and the cause. Here, steps 408, 410, and 414 are the same as in the related art, but the processing of step 412 is added according to the present invention.

Referring again to FIG. 3, in response to the LE 100 transmitting a resource release request message DE_ALLOC to the port 102 and the time slot B to the AN 102 in step 304 to release the resources of the time slot being used. When the AN 102 sends a release request reject message DE_ALLOC_REJ to the LE 100 in step 306 that the port A and the time slot B do not coincide, the LE 100 is configured as described above with reference to FIG. In step 308 and 310 of FIG. 3, an audit message including port A as port information when a resource release request is performed, and an audit message with time slot B as time slot information when a resource release request is performed are performed. 102).

The AN 102 then transmits an audit response message carrying time slot information connected to port A and an audit response message carrying port information connected to time slot B to the LE 100. FIGS. 312 and 314 of FIG. Step 2 shows the audit response message AUDIT_COMP with port A and time slot C, if time slot C is connected to port A and port D with time slot B, and the audit response message AUDIT_COMP with port D and time slot B. An example of sending to 100 is shown.

The LE 100 confirming the port information and the time slot information as described above may read the resource release request message DE_ALLOC carrying the port A and the time slot C and the resource release request message DE_ALLOC carrying the port D and the time slot B (316) and (318). The resource is released by transmitting to the AN 102 in the step, and the AN 102 transmits the release request response message DE_ALLOC_COMP to the LE 100 in steps 320 and 322 in response thereto.

Therefore, when the LE 100 receives a release request reject message from the AN 102, which causes the port and time slots to be inconsistent, the corresponding port and time slots are audited to audit each port and time slot. By checking the time slot and port connected to each slot and requesting resource release again, resource release can be normally performed in real time.

Meanwhile, the audit response message AUDIT_COMP may be an audit response that no information is connected to the port information or time slot information of the audit message AUDIT. In this case, since the LE 100 has connected information, but the AN 102 means that there is no connected information, the LE 100 releases resources connected to itself.

As described above, the present invention does not end with notifying the operator of the rejection of the rejection request that causes the port and time slot not to coincide with each other. By requesting the release, the release of resources is normally performed in real time, which prevents the call from being processed normally and has the advantage of facilitating resource management more easily.

Claims (2)

In a local exchange and an access network interworked by a V5.2 interface, a port and a time slot do not coincide with a resource release request message sent to the access network to release a resource of a time slot in use by the local exchange. In the processing method when receiving a release request rejection message as a cause, Transmitting, to the access network, a first audit message carrying only port information included in the resource release request and a second audit message carrying only time slot information included in the resource release request; Transmitting a resource release request message including port information and time slot information in an audit response message received from the access network in response to the first audit message to the access network, and in response to the second audit message, the access network And transmitting the resource release request message including the port information and time slot information in the audit response message received from the access network to release the resource. The method of claim 1, further comprising releasing internally connected resources when the audit response message is an audit response that no information is connected to the port information or time slot information of the first and second audit messages. How to handle resource rejection request rejection of the local exchange.