KR20000065381A - Call processing method for call setup in V5.2 intergrated services digital network (ISDN) - Google Patents

Abstract

PURPOSE: A method for processing calls in a V5.2 ISDN call set is provided to offer a connection rate of the V5.2 ISDN call which is similar to a general ISDN call by minimizing a failure factor according to a BCC(bearer channel connection) protocol when requesting the V5.2 ISDN call. CONSTITUTION: If an access network(AN) transmits a setup message for a call connection to a switch(T1), a resource manager(RM) of the switch transmits an allocation request signal to a BCC protocol entity in the switch and the BCC protocol entity transmits the allocation request signal to a BCC protocol entity of the AN(T2). The AN transmits an allocation complete message to the switch in the case that a channel for an allocation is normal, and transmits an allocation reject message to the switch in the case that a bearer channel release to a previous call is abnormal(T3). The switch transmits an audit signal to the AN for grasping as to whether the current allocated bearer channel is a certain channel, and the AN performs an audit process and transmits an audit complete message to the switch(T4).

Description

5.2 Call processing method for call setup in V5.2 intergrated services digital network (ISDN)

The present invention relates to a call processing method in a general information communication network (hereinafter referred to as ISDN) call setup, and in particular, an electronic switch that accommodates subscribers of an access network (AN) using a V5.2 protocol is a V5. .2 An ALLOCATION REJECT message from the subscriber network (Reject Cause ') when performing Bearer Channel Connection (BCC) protocol processing due to an ISDN call establishment request. 5 ')), the present invention relates to a method for allowing a call to be connected normally without ending a call request.

In general, V5.2 ISDN calls perform BCC protocol unlike general ISDN calls, so there are block factors on the BCC protocol in addition to the call block factors in Q.931 messages.

At this time, the most common block factor is due to the occurrence of an assignment rejection message. Among these messages, a port was released on the exchange side. Mainly applicable.

Due to this, a conventional V5.2 ISDN call processing procedure in which call assignment is blocked will be described with reference to FIG.

When the subscriber network transmits a setup message (SETUP) for call connection to the exchange side (S1), the resource manager (RM) (not shown in the figure) of the exchange side receives a BCC protocol entity (BCC_PE (Protocol) in the exchange. Entity)) transmits an allocation request signal (MDU_BCC), and the BCC protocol entity in the exchange receiving the transmission transmits the allocation request signal to the BCC protocol entity of the subscriber network (S2).

The subscriber network receiving the allocation request signal transmits an ALLOCATION COMPLETE message to the exchange when the channel for allocation is normal, but allocates when the bearer channel for the previous call is not released normally. A rejection message (rejection value: '0000101') is transmitted to the exchange (S3).

The exchange side receiving the rejection message transmits an AUDIT signal to the subscriber network to find out which bearer channel is currently allocated, and the subscriber network receiving the signal performs an audit process and then completes an audit completion in response. Send an (AUDIT COMPLETE) message to the exchange (S4).

The exchange receiving the signal checks the bearer channel in the message, and then transmits a DEALLOCATION request message to the subscriber network for the bearer channel, and the subscriber network allocates the bearer channel according to the request and then releases a complete allocation. The message (DEALLOCATION COMPLETE) is transmitted (S5).

When the deallocation complete message is received at the exchange, the exchange terminates the currently generated call by transmitting a RELEASE COMPLETE message according to the call establishment request of the subscriber network (S6).

As described above, there is a problem in that a call access rate is lowered due to a channel deassignment error in the subscriber network.

In view of the conventional problems described above, the present invention improves the call connection rate in V5.2 ISDN by allowing the exchange to continue normally without terminating the call request when the exchange receives an assignment rejection message. It is aimed at letting.

In other words, after performing the audit procedure and the deassignment request procedure, the call is connected by re-performing the assignment procedure with a new BCC reference number.

At this time, in order not to conflict with the timer of the q.931 setup message, the deallocation and reassignment procedure requests are performed at the same time.

1 is a signaling diagram showing a conventional V5.2 ISDN call processing process.

Figure 2 is a signaling procedure showing a V5.2 ISDN call processing process according to the present invention.

In order to operate as described above, the process of transmitting an allocation request message at the exchange for the call establishment of the subscriber network, the step of transmitting an audit request message to the subscriber network when the allocation rejection message for the allocation request is received by the exchange, In the call processing method in the V5.2 ISDN call establishment, including receiving an audit complete message for the audit request,

The exchange receiving the audit complete message from the subscriber network sends an allocation request message for detecting and releasing a bearer channel included in the audit complete message, and at the same time, assigns an allocation request including a BCC reference number different from the assignment request message. Transmitting the request message to the subscriber network;

And when a complete message for each request message is received, transmitting a setup acknowledgment (ACK) signal for a call requesting the setup to a subscriber network.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a view illustrating a V5.2 ISDN call processing procedure according to the present invention. When a setup message (SETUP) for call connection is transmitted from a subscriber network to a switch side (T1), a resource manager (RM) of the exchange side is shown. (Not shown) transmits an allocation request signal (MDU_BCC) to the BCC protocol entity (BCC_PE (Protocol Entity)) inside the exchange, and the received BCC protocol entity in the exchange is sent to the BCC protocol entity of the subscriber network. The allocation request signal is transmitted (T2).

The subscriber network receiving the allocation request signal transmits an ALLOCATION COMPLETE message to the exchange when the channel for allocation is normal, but allocates when the bearer channel for the previous call is not released normally. Send a reject message (reject value: '0000101') to the exchange (T3).

The exchange side receiving the rejection message transmits an AUDIT signal to the subscriber network to find out which bearer channel is currently allocated, and the subscriber network receiving the signal performs an audit process and then completes an audit completion in response. Sends an (AUDIT COMPLETE) message to the exchange (T4).

The exchange receiving the signal checks the bearer channel in the message, and then transmits a DEALLOCATION request message (the BCC reference number, for example, A1) for the bearer channel to the subscriber network. An allocation re-request message (with a BCC reference number, for example, A2) having a new BCC reference number different from the deassignment request message is transmitted to the subscriber network (T5).

Since the BCC protocol entity of the subscriber network receiving each message processes each message in BCC reference number units (A1 and A2) (the same in the exchange), the allocation and allocation of the same interface and the same port are performed. Even if the request message is received at the same time, it is not affected by the processing, and the allocation re-request message is transmitted after the de-allocation message is sent to the resource manager of the subscriber network. The message and the assignment complete message are transmitted (T6).

As described above, when the deassignment complete message and the allocation complete message are received to the exchange after the procedure in the subscriber network according to each deassignment and allocation request is performed, the exchange confirms the establishment acknowledgment of the call setup requested by the subscriber network. SETUP ACK) signal is transmitted (T7).

In the above process, if a DEALLOCATION REJECT message is received when retrying the allocation request procedure, a call generated by sending a RELEASE COMPLETE message to the subscriber network is treated as a failure. do.

For reference, the reason for transmitting the deassignment request and the reassignment request message at the same time is that the resource manager of the exchange transmits the deassignment request message, receives the deassignment complete message, and then transmits the reassignment request message and attempts to connect the bearer channel. The call is not successful because a time-out occurs in Q.931's setup message.

Therefore, the setup timer value of Q.931 is satisfied by simultaneously transmitting the deallocation request message and the allocation request message.

As described in detail above, the present invention has an advantage of providing a V5.2 ISDN call access rate without discrimination from a general ISDN call by minimizing a failure factor due to a BCC protocol when a V5.2 ISDN call is requested.

In addition, a preferred embodiment of the present invention is disclosed for the purpose of illustration, those skilled in the art will be able to make various modifications, changes, additions, etc. within the spirit and scope of the present invention, such modifications and modifications belong to the following claims You will have to look.

Claims (2)

A process of transmitting an allocation request message at the exchange for call establishment in the subscriber network, a process of transmitting an audit request message to the subscriber network when an allocation rejection message for the allocation request is received at the exchange, and an audit complete for the audit request ( A method for processing a call in a V5.2 ISDN call setup comprising receiving a complete message, The exchange receiving the audit complete message from the subscriber network sends an allocation request message for detecting and releasing a bearer channel included in the audit complete message, and at the same time, assigns an allocation request including a BCC reference number different from the assignment request message. Transmitting the request message to the subscriber network; V5.2 Integrated Information Communication Network (ISDN) call, characterized in that it comprises the step of transmitting a configuration acknowledgment (ACK) signal for the call requesting the configuration to the subscriber network when a complete message for each request message is received. How to handle calls in configuration. The method of claim 1, V5.2 comprehensive information, characterized in that the exchange transmits a release complete message to the subscriber network after the allocation re-request message is transmitted, thereby causing the call to fail to be processed. Call processing method in an ISDN call establishment.