KR20010047755A - Method of processing for Always On/Dynamic ISDN service - Google Patents

Abstract

PURPOSE: A method of providing ISND A0/D1(Always On/Dynamic ISDN) service is provided to reduce the load of the network which is increased with the Internet users, and also provide the service to more service consumers with the same network resource. CONSTITUTION: In the method of providing ISDN AO/DI service, low speed data are transmitted to D channel of ISDN according to the state of outbound queue of the packet service. Then, according to the state of the outbound queue of the packet service, one or two B channels are added to provide a high-speed data service. According to the state of the outbound queue, one or two B channels

Description

How to provide ISDN EO / DIA service for internet connection service {Method of processing for Always On / Dynamic ISDN service}

The present invention relates to an ISDN (Integrated Services Digital Network) AO / DI (Always On / Dynamic ISDN) service providing method, in particular, always using the D channel used only as a signal channel in the existing ISDN service consisting of 2B + D The present invention relates to a method for providing AO / DI service, which is one of new ISDN services providing a connected X.25 packet service and providing data communication service through a B channel as needed.

With the recent increase in dial-up subscribers, Internet access traffic has increased rapidly. Since this is handled in a public switched network (PSTN / ISDN) having a fixed bandwidth, there are problems such as overload of the public telecommunication network switch, inefficiency of transmission, and deterioration of the quality of the existing voice service. In other words, dial-up Internet users are connected to the Internet information provider by circuit switching, and the load of the public communication network is increased because the Internet call occupancy time is too long for the voice call. On the other hand, when analyzing the types of Internet traffic, there are services that require high bandwidth in order to transmit a large amount of information, including multimedia and graphics, while e-mail transmission, news provision, chatting, text data transmission, and stock information. Services such as the above can be serviced with a low bandwidth of 9.6 Kbps or less.

Therefore, in order to efficiently use the communication network, a method that can process low-speed data was sought. As a method of this, X.25 packet service can be provided to an ISDN D channel, which was previously used only as a signaling channel, and is 9.6 Kbps or less. Low-speed data is always connected to ISDN D channel, and high-speed data is ISDN AO / DI service that can provide services from 64 to 128 Kbps by connecting one or two ISDN B channels according to bandwidth. Developed. Therefore, data communication traffic, which was connected to circuit-switched network in the existing dial-up service, is connected to packet-switched and circuit-switched network according to bandwidth, so that network resources can be efficiently used and services can be provided to more service users with the same resources. have.

The present invention has been made to solve the problems of the prior art as described above, the Internet connection is always on the connection to reduce the load of the communication network, increasing the number of users, and to provide services to more service users with the same network resources The purpose is to provide various application services using Always On or Dynamic ISDN as a service.

1 is a block diagram of the AO / DI network applied to the present invention,

2 is a protocol structure diagram for providing an AO / DI service according to an embodiment of the present invention;

3 is a diagram illustrating PPP encapsulation on X.25 for providing AO / DI service according to an embodiment of the present invention;

4A and 4B are flowcharts illustrating additional bandwidth allocation and release of an AO / DI service according to an embodiment of the present invention.

According to the present invention for achieving the object as described above, in the method for providing an Integrated Services Digital Network (ISDN) AO / DI service, which is an always-connected Internet service, a low speed according to the state of the outbound queue of the packet service Providing a data on the D channel of the ISDN; A second step of additionally allocating one or two B channels according to a state of an outbound queue of the packet service to provide a high speed data service; There is provided an ISDN AO / DI service providing method comprising a third step of releasing one or two B channels according to a state of an outbound queue of a packet service.

The method further includes: providing, to the computer, low-speed data to the D channel of the ISDN according to the state of the outbound queue of the packet service; A second step of additionally allocating one or two B channels according to a state of an outbound queue of the packet service to provide a high speed data service; A computer-readable recording medium having recorded thereon a program capable of executing the step including the third step of releasing one or two B channels according to the state of the outbound queue of the packet service is provided.

In the following, with reference to the accompanying drawings, a preferred embodiment according to the present invention will be described in detail.

1 is an AO / DI network configuration diagram applied to the present invention, wherein the AO / DI service includes an AO / DI service user, an AO / DI terminal matching device, an ISDN, a packet network, and an Internet network.

The AO / DI ISP (Internet Service Provider) of the Internet network is composed of a RAS (Remote Access Server), an Internet server, an authentication server, and the RAS is a service access to an AO / DI service subscriber. And an authentication function. In addition, the Internet server provides a general Internet service and a D-channel packet service, the general Internet server can also be connected to the RAS, the authentication server performs the authentication function for the subscriber.

The AO / DI ISP is provided with three network access methods according to the packet processing method. First, the RAS accesses a packet network through an X.25 packet link and simultaneously accesses an ISDN through a PRI (Primary Rate ISDN) link. The RAS accesses a circuit switched network using a PRI link and provides a B channel circuit access service. At the same time, it connects to the packet network using X.25 packet link and provides D channel packet service. At this time, the D channel packet service is serviced through the packet network.

Second, the RAS is connected to ISDN by BRI / PRI. This RAS accesses a circuit switched network using basic rate ISDN (BRI) / PRI and provides a B channel circuit access service. At the same time, it provides D channel packet service using specific channel of PRI. Here, the D channel packet service is serviced using the packet service of ISDN, not through the packet network, and the allocation of PRI resources for the D channel packet should be able to flexibly cope with data traffic and network construction status of the network operator.

Third, the RAS is connected to ISDN through BRI / PRI and SS No. 7 link (E1). The RAS accesses a circuit switched network using an SS No. 7 link (E1) and provides D channel packet service. Here, the D channel packet service is serviced using the packet service of the ISDN without passing through the packet network, and all the resources of the packet PRI are used for the D channel packet.

2 is a diagram illustrating a protocol structure for providing AO / DI service according to an embodiment of the present invention.

ISDN D Channel X.25 SVC calls are routed from the service subscriber to the D Channel Packet Service Provider (ISP). The Multi Link Point To Point Protocol (MLPPP) and TCP / IP protocol on the D channel are encapsulated on an X.25 logical circuit. The B channel uses a multi-link point-to-point protocol without Q.920 / 921 and X.25 encapsulation used on the D channel, and requests a bandwidth allocation protocol (BAP) by request of bandwidth allocation control (BAC). Protocol and Bandwidth Allocation Control Protocol (BACP) procedures are additional allocations between the terminal and the ISP. That is, the circuit switched connection between the ISP and the service subscriber is established on the B-channel, and the data are transmitted through PPP encapsulation on the established B-channel. The protocol stack of FIG. 2 may be implemented in an AO / DI terminal and an AO / DI router, that is, a remote access server (RAS) to provide AO / DI services.

3 is a diagram illustrating PPP encapsulation on X.25 for providing AO / DI service according to an embodiment of the present invention.

If a logical X.25 SVC is established by the AO / DI terminal request, PPP negotiation with the RAS will begin, and the AO / DI terminal will attempt to call the RAS. The RAS accepts a call input from the AO / DI terminal and authenticates the AO / DI service call using an authentication protocol (eg PAP, CHAP). When a datagram is input from the upper PPP layer to the X.25 layer, the PPP header, information, and padding fields are encapsulated in the X.25 payload and transmitted.

4A and 4B are flowcharts illustrating additional bandwidth allocation and release of an AO / DI service according to an embodiment of the present invention.

First, in step S401, when power is supplied to the PC for the present invention to operate, in step S402, the AO / DI terminal matching device is connected to the ISP by means of an X.25 SVC call setup procedure on the ISDN D channel, and in step S402 In S403, the AO / DI service user can always receive the data service for the low speed data (9.6 Kbps) on the D channel.

Subsequently, in step S404, if the AO / DI subscriber is requesting a new data service of 9.6 Kbps or more while performing a data communication service by connecting to the Internet via a D channel (for example, downloading a file including graphics), Bandwidth should be increased by adding B channels through the Bandwidth Allocation Protocol (BAP) and the Bandwidth Allocation Control Protocol (BACP). To this end, in step S405, after checking the state of the outbound queue of the packet service to check the time required to process the data accumulated in the queue, in step S406, the required time checked in step S405 is Determine whether it is smaller than the set value In this embodiment, the determined predetermined time is set to 5 seconds.

As a result of the determination in step S406, if the time required is less than 5 seconds, in step S407, since the current queue state can be serviced only by the D channel, the service continues without adding bandwidth. Subsequently, in step S408, if the PC power is cut off or the connection to the network becomes impossible while the data communication service continues to be performed on the D channel, the service is terminated, and when the network condition is improved or the power is supplied to the PC later, The process proceeds again from the step S402.

On the other hand, if the time taken to process the packet data accumulated in the queue is 5 seconds or more as a result of the determination in step S406, it is determined in step S409 whether the required time is 5 seconds or more and less than 10 seconds.

As a result of the determination in step S409, if the required time is 5 seconds or more and less than 10 seconds, in step S410, it is determined whether the B1 channel is available in order to add the B1 channel for increasing the bandwidth.

If the B1 channel is not available as a result of the determination in step S410, in step S423, the data accumulated in the queue is continuously processed to empty the queue. In step S424, after checking the state of the queue, the flow returns to step S410. .

As a result of the determination in step S410, if the B1 channel is available, in step S411, the bandwidth allocation by BAP / BACP and MLPPP is negotiated, and the B1 channel is further allocated, and then in step S412, data communication is performed on the B1 channel ( 64 Kbps). Subsequently, in step S413, the queue status is checked while the data communication service is in progress, and in step S414, it is determined whether the time required for processing the data accumulated in the queue is less than 5 seconds.

As a result of the determination in step S414, if the time taken to process the data accumulated in the queue is less than 5 seconds, the channel B1 is released and then the flow returns to step S407.

As a result of the determination in step S414, if the time required for processing the data accumulated in the queue is 5 seconds or more, it is determined in step S415 whether the required time is 5 seconds or more and less than 10 seconds.

As a result of the determination in step S415, if the required time is 5 seconds or more and less than 10 seconds, the process returns to step S412. If the required time is 10 seconds or more, it is determined in step S417 whether the B1 and B2 channels are available. do.

As a result of the determination in step S417, if the B1 and B2 channels are available, the B1 and B2 channels are allocated in step S418, and data communication proceeds at 128 Kbps in step S419.

As a result of the determination in step S417, if the B1 and B2 channels are not available at the same time, it is determined in step S420 whether the B1 channel is in use.

As a result of the determination in step S420, if the B1 channel is not in use, the process proceeds to the step S419. If the B1 channel is in use, it is determined in step S421 whether the B2 channel is available.

As a result of the determination in step S421, if the B2 channel is not available, the process returns to the step S412. If the B2 channel is available, the process further allocates the B2 channel in step S422, and then proceeds to the step S419. .

In other words, when the B1 channel is in use and the B2 channel is not available, the outbound queue of the packet service is continuously checked while data communication is performed with one B1 channel.

If the required time is 10 seconds or more as a result of the determination in step S409, the flow proceeds to step S417.

On the other hand, the process after step S419 is shown in Figure 4b.

In step S425, the time for emptying the outbound queue of the packet service is checked while data communication is performed on the two B channels, and in step S426, it is determined whether the required time is 10 seconds or more.

As a result of the determination in step S426, if more than 10 seconds is required, the process returns to the step S419, and if less than 10 is required, it is determined in step S427 whether the required time is 5 seconds or more and less than 10 seconds.

As a result of the determination in step S427, if the required time is 5 seconds or more and less than 10 seconds, in step S428, after canceling the B2 channel, in step S429, data communication is performed in the B1 channel, and in step S430, the B1 channel is disconnected. After checking the time for emptying the outbound queue of the packet service to check whether it can be released, it is determined in step S431 whether the time required is less than 5 seconds.

As a result of the determination in step S431, if the required time is less than 5 seconds, in step S432, after canceling the B1 channel, the process returns to the step S407. If the required time is not less than 5 seconds, an error is displayed in step S433. do.

On the other hand, as a result of the determination in step S427, if the required time is not more than 5 seconds and less than 10 seconds, the flow proceeds to step S431.

The present invention as described above is recorded on a computer-readable recording medium, and can be processed by a computer.

As described in detail above, according to the present invention, the AO / DI service can be separated from the subscriber station into the circuit network and the data network according to data traffic, thereby increasing network efficiency than when all existing data communication services are connected to the circuit network. Therefore, many subscribers can be provided with the same network resources. Therefore, service providers can reduce their network investment and service users can use the Internet service at a low cost.

The technical spirit of the present invention has been described above with reference to the accompanying drawings, but this is by way of example only and not by way of limitation to the present invention. In addition, it is obvious that any person skilled in the art may make various modifications and imitations without departing from the scope of the technical idea of the present invention.

Claims (2)

In the method for providing an integrated services digital network (ISDN) AO / DI service, which is an always-connected Internet service, A first step of providing low-speed data to a D channel of an ISDN according to a state of an outbound queue of a packet service; A second step of additionally allocating one or two B channels according to a state of an outbound queue of the packet service to provide a high speed data service; And a third step of releasing one or two B-channels according to the state of the outbound queue of the packet service. On your computer, A first step of providing low-speed data to a D channel of an ISDN according to a state of an outbound queue of a packet service; A second step of additionally allocating one or two B channels according to a state of an outbound queue of the packet service to provide a high speed data service; And a third step of releasing one or two B-channels according to the state of the outbound queue of the packet service.