KR19980085286A - Parameter setting method of Broadband Bearer Capability information element field in public asynchronous transfer mode (ATM) switching system - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a parameter setting method of a broadband bearer capability information field.

2. The technical problem to be solved by the invention

The present invention is to provide a method for setting a parameter of the broadband transport capability information element field in a setup message defined in ITU-T Q.2931 to ensure quality of service (QoS).

3. Summary of Solution to Invention

The present invention distinguishes the destination party by the destination IP address of the IP header and distinguishes each application program from the source port of the TCP / UDP header in the public network ATM switching system. As a result, quality of services having different network characteristics can be guaranteed through different parameter mapping.

4. Important uses of the invention

The present invention is used in public network ATM switching system.

Description

Parameter setting method of Broadband Bearer Capability information element field in public asynchronous transfer mode (ATM) switching system

The present invention provides the International Telecommunication Union (ITU-T) Recommendation Q.2931 to ensure the Quality of Service (QoS) of Transmission Control Protocol / User Data Protocol (TCP / UDP). A parameter setting method of a Broadband Bearer Capability information element field in a setup message defined in FIG.

Existing Internet application services need to introduce new technologies due to the increase of subscribers and the demand for various services. As a result, a lot of researches are being conducted to provide existing Internet services in the asynchronous delivery mode (ATM) network. In order to realize Internet service in Asynchronous Transfer Mode (ATM) network, technologies such as LANE (LANE), Internet Protocol Over ATM (IPOA), Multi-Protocol Over ATM (MPOA), and IP switching and tag switching have been proposed. . In the interworking between heterogeneous networks, a service guarantee problem is newly raised when considering services using network characteristics. This is how to guarantee the quality of service (QoS) of the existing Internet service in the asynchronous delivery mode (ATM) network. Although the quality of service to be supported in different networks initially had many different characteristics, in recent years, it has been developed to support various traffic characteristics in any network. For example, services on the Internet basically only support Best-Effort services. That is, the data traffic was serviced without any guarantee using the first-come first-serve (FCFS) technique. However, users are demanding multimedia traffic that requires wide bandwidth, and efforts have been made to ensure the quality of service using technologies such as Resource ReSerVation Protocol (RSVP), and particularly, asynchronous delivery mode (ATM). ) Has the proper characteristics for the multimedia traffic transmission, and has been researched and developed as a technology with many advantages such as flexible bandwidth allocation, high speed transmission capability, and reliability. The existing approaches to guaranteeing the quality of Internet service in Asynchronous Networks (ATM) networks are available in two ways, as appropriate QoS parameter mapping and efficient virtual channel (VC) management.

When interworking between the internet network and the asynchronous delivery mode (ATM) network, the functions to be performed by the companion device can be roughly classified into an address translation function and a parameter mapping function. (E.g. IP, IPX address, etc.) to the asynchronous forwarding mode (ATM) address used in the asynchronous network (ATM) address (e.g. NSAP, E.164 address, etc.) related to the function related to the function I'm leaning. However, when supporting the services provided on the Internet in the asynchronous delivery mode (ATM) network, the technology for the part that can guarantee the quality of service of the Internet service is still insufficient.

In TCP / IP (Transmission Control Protocol / Internet Protocol), which is the most commonly used protocol among the Internet services, quality of service is guaranteed through the use of the service type field in the Internet Protocol header part of the network layer. Is done. What is defined in this field is to set up services that are sensitive to delay, throughput, and reliability, but this field is not actually used in the current Internet environment.

In the IP (Internet Protocal) switching technology, which is a technology considered when interworking with the Internet network and the asynchronous delivery mode (ATM) network, IP packets are directly processed on the asynchronous delivery mode (ATM) exchange according to the characteristics of the application rather than guaranteeing the quality of service. Whether to transfer IP data through asynchronous transfer mode (ATM) switching by mapping the IP address to an Asynchronous Virtual Mode Identifier / Virtual Channel Identifier (VPI / VCI) number. I'm interested. It is simply an approach to control the IP packet using the router function or to control the IP packet using the signaling function of an asynchronous transfer mode (ATM) exchange. In addition, the Forum on Asynchronous Transfer Mode (ATM) proposes Multiprotocol over ATM over Asynchronous Transfer Mode (ATM), which is basically applicable to private networks. Network Interface) based on 3.0 / 3.1 / 4.0.

Accordingly, the present invention classifies TCP / UDP (Transmission Control Protocol / User Data Protocol) appropriately for signaling supported by the public asynchronous transfer mode (ATM) network to ensure quality of service (QoS). Its purpose is to provide a method for parameter setting in the Broadband Capability Information Elements field in the setup message defined in ITU-T Recommendation Q.2931.

1 is a structural diagram of a public ATM network switching system to which the present invention is applied;

2A is a block diagram of a transmission control protocol (TCP) message header format to which the present invention is applied;

2B is a configuration diagram of a user data protocol (UDP) message header format to which the present invention is applied;

3 is a block diagram of a broadband transmission capability information element in an International Telecommunication Union (ITU-T) Recommendation Q.2931 setup message to which the present invention is applied;

4 is a flow chart of a parameter setting method in asynchronous delivery mode (ATM) signaling using Transmission Control Protocol / User Data Protocol (TCP / UDP) in accordance with the present invention.

* Explanation of symbols for main parts of the drawings

101: IP host

102: Ethernet / Token Ring

103: ATM Termination Equipment

116: ATM Switch

In order to achieve the above object, the present invention relates to a parameter setting method of a broadband bearer capability information element field applied to an asynchronous transfer mode (ATM) switching system. A first step of reading a source port of a user data protocol (TCP / UDP) message header part and searching a delivery control protocol / user data protocol (TCP / UDP) database to determine a service type; A second step of setting parameters of a delivery class field, a traffic type field, and a time constraint field according to the service type of the first step; And a third step of constructing a setup message according to the International Telecommunication Union (ITU-T) Recommendation Q.2931 specification and then transmitting it to the public network asynchronous delivery mode (ATM) switching system.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention;

FIG. 1 is a structural diagram of a public ATM network switching system to which the present invention is applied. In the drawing, 101 is an IP host, 102 is an Ethernet / token ring, 103 is an ATM end equipment, and 116 is an ATM switch.

Each subscriber's Internet Protocol (IP) host 101 terminates an asynchronous delivery mode (ATM) with IEEE 802.3's Carrier Sense Multiple Access / Collision Detection (CSMA / CD) or IEEE 802.5's Token Ring (102). It is matched to an equipment (ATM Router) 103 to form a local area network (LAN). The asynchronous transfer mode (ATM) termination equipment 103 is equipped with a commercial asynchronous transfer mode (ATM) interface card to provide a match between an asynchronous transfer mode (ATM) exchanger and an asynchronous transfer mode (ATM) scheme.

An Asynchronous Transfer Mode (ATM) exchange system consists of a delivery network that performs control and transfer of user information and a control network that controls them. The transport network is an Interconnect Switch Network Module (ISNM) 105, which is an internal connection switch network of the ATM Central Switching Subsystem (ACS) 104, and an Access Switch Network Module (ASNM) of an ATM Local Switching Subsystem (ALS) 106. 107, and a switch network portion consisting of a link interface module (LIM) 108 that is responsible for link matching between the ASNM 107 and the ISNM 105, and a subscriber interface module (SIM) responsible for subscriber matching function. ) And a matching portion consisting of a trunk interface module (TIM) 110 that is responsible for a relay line matching function, and a network synchronization part (NSP) 111 providing network synchronization and a system clock. The control network includes a call processing part (CPP) 112 for call control, a number translation part (NTP) 113 for performing number translation processing, a signaling handler part (SHP) 114 for signal processing, and It consists of an Operation and Maintenance Part (OPM) 115 that is responsible for the operation and maintenance of the system.

2A is a block diagram of a transmission control protocol (TCP) message header format to which the present invention is applied, and FIG. 2B is a diagram of a user data protocol (UDP) message header format to which the present invention is applied. It is a block diagram.

The data frame of the application driven by the user is added to the transport layer (TCP / UDP), which is added with the TCP / UDP header, and the data layer with the TCP / UDP header is added with the IP header, and the network layer. (IP) is sent. The data frame encapsulated in the IP header and the TCP / UDP header is transmitted to the called party through the data link layer and the physical layer. The data frame arriving at the called party goes up to the user application layer in the reverse order of the calling process, thereby making Internet service. In this communication procedure, the other party's identification is performed using the destination IP address of the IP header, and each application program is identified using the source port number of the TCP / UDP header. Eventually, the application protocol can be distinguished using the originating port of TCP / UDP, and in the present invention, the quality of services having different network characteristics through different parameter mapping according to the application identified as the originating port is will be.

In the present invention, application protocols are classified into a real-time service (RTS), a non-real-time service (NRTS), and a best-effort service. However, application services using TCP / UDP are still being developed, and since there may be various classification schemes of service types, the present invention will not be discussed in detail regarding the classification of such Internet services.

3 is a block diagram of a broadband transmission capability information element in an International Telecommunication Union (ITU-T) Recommendation Q.2931 setup message to which the present invention is applied.

Asynchronous transfer mode (ATM) signaling is defined in terms of signaling standards for data transmission between the calling party and the called terminal. It is published in the International Telecommunication Union (ITU-T) as Recommendation Q.2931. In the present invention, in the Q.2931 signaling, the broadband transport capability information element field among the information elements in the setup message transmitted to the called party for circuit establishment is appropriately set to the service of the aforementioned TCP / UDP application protocol. The three parts of the Broadband Capability Information Element field configured for service guarantee are a 5-bit bearer class field, a 3-bit traffic type field, and a 2-bit timing requirement. Field, as shown in the following table.

TABLE 1

Bearer Class-5 bits One Broadband Connection Oriented Bearer-type A (BCOB-A) 11 Broadband Connection Oriented Bearer-type C (BCOB-C) 10000 Broadband Connection Oriented Bearer-type X (BCOB-X)

TABLE 2

Traffic Type-3 bits 0 No indication One Constant Bit Rate (CBR) 10 Variable Bit Rate (VBR) 11 Unspecified Bit Rate (UBR)

TABLE 3

Timing Requirements-2 bits 0 No indication One End-to-End Timing Required 10 End-to-End Timing Not Required

FIG. 4 is a flowchart illustrating a parameter setting method in asynchronous delivery mode (ATM) signaling using a transmission control protocol / subscriber data protocol (TCP / UDP) according to the present invention, and information on a port number of an application service using TCP / UDP. Shows a method of setting a parameter of a broadband transport capability information element field supported by asynchronous transfer mode (ATM) signaling using.

The Asynchronous Interworking Mode (ATM) interworking device includes protocol discriminators, message types, ATM Adaptation Layer (AAL) parameters, calling party numbers, and called party numbers. A setup message is constructed and sent to an asynchronous transfer mode (ATM) exchange to request call setup. When a call request at the upper layer is received from the network layer (IP layer) (401), the source port of the TCP / UDP packet header portion encapsulated inside the IP datagram is read (402). The TCP / UDP application protocol database (Data Base) is retrieved using the value as a key (403). When a service type is determined based on this database, a parameter setting process for each service type is performed.

If the service type is a real-time service, set the class of transmission field in the Broadband Capability Information element in the ITU-T Recommendation Q.2931 Setup message to 1 for broadband connection-oriented delivery (Type A). 404, the traffic type field value is set to 1, which is a fixed bit rate (405), and the time limit field value is set to 1, respectively, indicating that end-to-end time restrictions are required (406). The other information elements that make up the setup message are then set in accordance with the rules laid down in the International Telecommunication Union (ITU-T) Recommendation Q.2931 specification to form a complete setup message, and then the user of an Asynchronous Exchange Mode (ATM) exchange. A protocol matching (UPIF: User Protocol Interface Function) block is sent (413). Subsequently, the call establishment request goes through a process for call processing through a User Protocol Interface Function (UPIF) block and a User Protocol Control Funtion (UPCF) block.

On the other hand, if the service type is a non-real-time service, the value of the class of transmission field is set to 11 for broadband connection-oriented delivery (type C) in the broadband transport capability information element in the ITU-T Recommendation Q.2931 Setup message. In step 407, the traffic type field value is set to 10, which is a variable bit rate, and the time limit field value is set to 10, indicating that no end-to-end time restriction is required (409). The other information elements that make up the setup message are then set in accordance with the rules laid down in the International Telecommunication Union (ITU-T) Recommendation Q.2931 specification to form a complete setup message, and then the user of an Asynchronous Exchange Mode (ATM) exchange. A protocol matching (UPIF: User Protocol Interface Function) block is sent (413).

And, if the service type is best service, set the class of delivery field value in the Broadband Capability Information element in the ITU-T Recommendation Q.2931 Setup message to 10000 for broadband connection-oriented delivery (Type X). 410, the traffic type field value is set to 11, which is an unspecified bit rate (411), and the time constraint field value is set to 10, indicating that no end-to-end time restriction is required (412). The other information elements that make up the setup message are then set in accordance with the rules laid down in the International Telecommunication Union (ITU-T) Recommendation Q.2931 specification to form a complete setup message, and then the user of an Asynchronous Exchange Mode (ATM) exchange. A protocol matching (UPIF: User Protocol Interface Function) block is sent (413).

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains, and the above-described embodiments and accompanying It is not limited to the drawing.

As described above, the present invention can satisfy the user's needs by ensuring the quality of various services required by the user in the interworking problem between the internet network currently being researched and developed and the asynchronous delivery mode (ATM) network. In this case, it is possible to guarantee the TCP / UDP-based quality of service provided by the existing internet network by using the asynchronous transfer mode (ATM) signaling provided by the public network asynchronous transfer mode (ATM) exchange. The use of the International Telecommunication Union (ITU-T) Recommendation Q.2931 signaling implemented on public network asynchronous transfer mode (ATM) exchanges, which will be used as a time base, is significant.

Claims (2)

In the parameter setting method of the Broadband Bearer Capability information element field applied to an ATM switching system, Upon receiving a call request message, reads the originating port of the delivery control protocol / user data protocol (TCP / UDP) message header part and searches the delivery control protocol / user data protocol (TCP / UDP) database to determine the type of service. step; A second step of setting parameters of a delivery class field, a traffic type field, and a time constraint field according to the service type of the first step; And Parameter setting of the broadband transport capability information element field comprising a third step of constructing a setup message according to the International Telecommunication Union (ITU-T) Recommendation Q.2931 and then transmitting it to the public asynchronous transfer mode (ATM) switching system. Way. The method of claim 1, The second step, If the service type is a real-time service, the transmission class field is set to broadband connection-oriented forwarding-type (BCOB-A), the traffic type field is set to a fixed bit rate, and the time constraint field is set to require end-to-end timeout. Fourth step; If the service type is non-real-time service, set the class of transmission field to Broadband Connection-oriented Forwarding-C (BCOB-C), set the traffic type field to variable bit rate, and then set the time constraint field to eliminate the need for end-to-end timeout. Setting a fifth step; And If the service type is best service, set the Delivery Class field to Broadband Connection-oriented Forwarding-Type (BCOB-X), set the Traffic Type field to Unspecified Bit Rate, and then set the Time Constraints field to No End-to-End Timeout Required. And a sixth step.