KR100848803B1 - METHOD AND SYSTEM FOR QoS PROVIDE OF FLOW BASED IN IPv6 SERVICE NETWORK - Google Patents

Abstract

The present invention relates to a QoS providing technology in an IPv6-based service network. When a session service forming one flow is generated, the present invention transmits a flow service request message from an originating terminal to an access router of a network node to transmit QoS related flow information. Is configured to receive the flow information verified from the access router at the source terminal, construct a flow list, transmit an acknowledgment message to the access router, and receive an Ack message at the access router to obtain service session information of the source terminal. Configures the in-flow cache, sends the reconfigured packet including the flow information in the IPv6 hop-by-hop extension header to the access router at the source terminal, and flow information and access router in the extension header of the packet received at the access router. Compares the flow cache information configured in the As a result of the exchange, if the flow terminal can accept the flow service, the packet including the flow information is delivered to the network node on the path, and the flow information delivered to the router or the destination terminal, which is the network node on the path, is determined according to the available resources. Service admission control.

IPv6 service network, QoS information, flow processing router,

Description

METHOD AND SYSTEM FOR QoS PROVIDE OF FLOW BASED IN IPv6 SERVICE NETWORK}

1 is a block diagram showing an IPv6-based network configuration for guaranteeing flow-based QoS according to an embodiment of the present invention;

2 is a flowchart illustrating a configuration and collection procedure of QoS information in an IPv6-based network according to an embodiment of the present invention;

3 is a flowchart illustrating a procedure of transmitting QoS information collected on an IPv6-based network according to a preferred embodiment of the present invention;

4 is a view showing a flow information structure generated and delivered in a terminal and an access router according to an embodiment of the present invention;

The present invention relates to a technology for providing quality of service (hereinafter, referred to as QoS) in an IPv6 (Internet Protocol Version 6) -based service network, and in particular, collects flow-based QoS information between a terminal and a network, The present invention relates to a method and system for providing a flow-based quality of service in an IPv6 service network suitable for informing end-to-end flow-based QoS by notifying network devices on a service path.

In the conventional IP-based service network, a method for providing QoS is largely divided into two types, an integrated service (InteServ) and a differential service (DiffServ: Differential Service). The features are as follows.

The integrated service method includes QoS values defining QoS in a data structure called Tspec (Traffic Specification) and Rspec (reservation specification) between the terminal and the terminal at both ends, and is referred to as Resource ReSerVation Protocol (hereinafter referred to as RSVP). This is a method for guaranteeing QoS by passing these values to routers in a service intermediate path to reserve resources. Since this method is to establish end-to-end RSVP signal, it is mainly used in small network because there is a problem in providing service scalability when the number of service users increases.

The differential service method is a method of guaranteeing a service class of a user in a network based on a value of a differential service code point (DSCP) in a traffic class field of an IPv6 header, which defines a class according to a service in advance. This method is used to provide differentiated quality of service, not a method of providing QoS by flow (that is, by service session), because services are divided by class.

In addition, router equipment for processing flow-based packets for providing flow-based QoS has been developed, but the router itself only processes the flow-based packets in a unique manner.

In the conventional QoS providing method operating as described above, the integrated service method may provide QoS for each flow, but has a scalability problem that is difficult to use in a large network, and the differential service method is differentiated by service. By providing an advanced QoS processing scheme, there is a problem in that flow-based QoS cannot be provided.

The present invention is to overcome the above-mentioned limitations of the prior art, and provides a method and system for providing a flow-based quality of service in an IPv6 service network capable of providing end-to-end quality of service in an IPv6-based broadband converged network. Its purpose is to.

Another object of the present invention is a method and system for providing a flow-based quality of service in an IPv6 service network capable of delivering and processing QoS information to a router and a destination terminal on a path for guaranteeing flow-based QoS in an IPv6-based service network. To provide.

   An embodiment of the present invention is a method for providing a flow-based quality of service (QoS) in an IPv6 service network. When a session service forming one flow is generated, a flow service request is requested from an originating terminal to an access router of a network node. Verifying QoS related flow information by transmitting a message; constructing a flow list by receiving verified flow information from the access router at the source terminal; and transmitting a receipt success message to the access router And receiving the Ack message at the access router to configure a flow cache which is service session information of the source terminal, and accessing the packet reconstructed by including the flow information in the IPv6 hop-by-hop extension header at the source terminal. Transmitting to a router and receiving at the access router Comparing the flow information in the extended header of a packet with the flow cache information configured in the access router, and if the comparison result allows the source terminal to accept the flow service, forwarding the packet including the flow information to a network node on a path; And confirming flow information delivered to a router or a destination terminal, which is a network node on the path, and performing service admission control according to network available resources.

An embodiment system of the present invention is a flow-based quality of service system in an IPv6 service network. When a session service forming one flow is started, a flow service request message is transmitted to an access router, and the flow is transmitted from the access router. When the information is received, an originator for constructing a flow list, transmitting an acknowledgment message to the access router, and transmitting the reconstructed packet to the access router by including the flow information in an IPv6 hop-by-hop extension header. The terminal and the flow service request message received from the source terminal are verified, the verified flow information is transmitted to the source terminal, and the flow information in the extended header of the packet transmitted from the source terminal and the configured flow cache information are compared. To accommodate flow service, An access router that transmits a packet including flow information to a network node, and checks the flow information of the source terminal delivered from the access router to perform service admission control according to network available resources, flow flow that is flow-based QoS information And a network node or a destination terminal for constructing the information and delivering the flow information to the next network node.

Hereinafter, the operating principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, when it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. Terms to be described later are terms defined in consideration of functions in the present invention, and may be changed according to intentions or customs of users or operators. Therefore, the definition should be made based on the contents throughout the specification.

The present invention delivers and processes QoS information to a router and a destination terminal on a path for guaranteeing flow-based QoS in an IPv6-based service network. That is, in order to provide a quality of service such as an integrated service scheme in a broadband network such as a broadband convergence network (BcN), the service quality value of each user terminal is authenticated on a network operating server on a router capable of processing flow-based packets. The service quality value is provided to all routers in the path to provide end-to-end service quality in an IPv6-based broadband converged network.

For this purpose, a method of extracting information for processing flow-based QoS on a router capable of processing flow-based data packets and a method of informing the routers of the information are needed. In order to provide the flow-based QoS to the terminal, the flow-based QoS values of the source terminal are extracted from the access router, and the extracted QoS values are provided to the source terminal, and the terminal receives the verified QoS information from the access router and sends these information to the destination. Up to the middle routers, and the intermediate routers provide end-to-end flow-based QoS by configuring resources for end-to-end flow-based QoS guarantee using received flow-based QoS information values. can do.

1 is a block diagram showing an IPv6-based network configuration for guaranteeing flow-based QoS according to an embodiment of the present invention.

Referring to FIG. 1, the source terminal 102 and the destination terminal 116 attempt to use a service that guarantees flow-based QoS when generating a plurality of flows 118, 120, and 122 services from a network. To this end, the access routers 104 and 114 of the access network are configured as routers capable of processing flow-based packets, respectively. In addition, the network management servers 106 and 112 connected to the network have service-specific flow information of subscribers that can be provided by the source / destination terminals 102 and 116, and are transmitted from the access routers 104 and 114. Check whether the flow information is included in the subscriber's service-specific flow information. In addition, the routers 108 and 110 on the service path of the access and core networks are configured as routers capable of processing packets on a flow-by-flow basis.

2 is a flowchart illustrating a configuration and collection procedure of QoS information on an IPv6-based network according to an embodiment of the present invention.

Referring to Figure 2, in the IPv6-based access network as a procedure for receiving the flow information from the network equipment for the terminal between the two ends to perform the flow-based QoS service, in step 210, one flow in the source terminal 202 Session service is formed, and in step 212, the source terminal 202 transmits a flow service request message including flow information that is a QoS requirement to the access router 204, and the access router 204 in step 214. The flow information is extracted from the flow service request message, and the network information server 206 having the service information 216 of the subscriber station is requested to confirm the flow information.

The flow information confirmed by the network management server 206 is transmitted from the access router 204 to the source terminal 202 in step 220, and the source terminal 202 receiving the flow information receives the flow information reception success (step 222). Ack) message to the access router 204. The source terminal 202 then builds a flow list 224, which is session information, and the access router 204, which receives the Ack message, builds a flow cache 226 of the session.

3 is a flowchart illustrating a procedure of transmitting QoS information collected on an IPv6-based network according to a preferred embodiment of the present invention.

FIG. 3 illustrates flow packet processing routers on a path from the source terminal 302 to the destination terminal 312 using the QoS information collected in FIG. 2 to ensure that the flow-based QoS is guaranteed. A procedure for delivering flow information to the 304, 306, 308, 310 and the destination terminal 312 is shown.

First, in step 314 of the originating terminal 302, a session service forming one flow is started, and in step 316, a flow service request message including flow information that is a QoS requirement is sent to the access router 304, and the access router In step 304, the flow information is extracted from the flow service request message, and the flow information is requested from the network management server having the service information of the subscriber station.

When confirmed by the network management server, the received flow information is received by the access router 304 and transmitted to the source terminal 302, and the source terminal 302 builds a flow list 318 which is session information. In addition, the source terminal 302 forwards the acknowledgment message of the flow information to the access router 304 to establish the flow cache 320 of the session at the access router 304.

Thereafter, in step 322, the source terminal 302 sends the flow information constituting the information list of the session to the hop-by-hop extension header of IPv6, which is transmitted to all the routers of the intermediate waypoints in the transmission packet. And a packet including the session flow information to the access router 304.

The access router 304 of the source terminal 302 compares the session flow information of the hop-by-hop extension header of the packet forwarded in step 324 with the flow cache information 320 of the session at the access router 304 to obtain the same. If the flow information is a value, the packet is forwarded to the router 306 of the next path in step 330. If the flow information added to the extension header has a different value from the flow cache information of the session, the source terminal 302 is sent to the source terminal 302 in step 332. By sending an error message of a kind similar to ICMPv6, in step 334 the session information list is removed and the session cache information in access router 304 is also removed.

Core router 1 306 in the next hop checks whether it can provide the requested flow-based QoS based on the flow information in the hop-by-hop extension header of the packet validated by access router 304 in step 336. do. If there is a resource to provide QoS, a flow cache of the service session is established in step 338 and the packet is sent to core router2 308 of the next hop in step 340, and the previous access in step 342 if there is no resource to provide QoS. An error message is sent to the router 304 and the source terminal 302, and the flow cache 344 of the access router 304 in the path and the flow list 348 of the source terminal 302 are also removed.

That is, determining whether the requested flow-based QoS can be provided based on the flow information in the hop-by-hop extension header of the packet received on each router (304, 306, 308, 312) (324, 336, If available at 350, 360, and 370, performing the steps of transmitting the packet to the next hop (330, 340, 354, 364) to configure the session flow cache, thereby making the destination terminal 312 at the source terminal 302. The flow information cache is configured 338, 352, 362, 372 at routers 304, 306, 308, 312 and destination terminal 312 on the path to. However, a value of an idle timer (Idle_Timer), which is a self-timer, is placed in each flow cache and a flow list to recover flow resources when there is no service transmission for a predetermined time.

However, flow information transmitted from the source terminal 302 in the network node consisting of the destination terminal 312 and the routers 304, 306, 308, and 312 compares the flow cache information configured in the access router 1 304 (324). If there is no network available resources to be accommodated in the network node when it is not matched or whether the QoS of the transmitted flow information is provided (336, 350, 360, 370), each network node, that is, the destination terminal 312, Access router 1 304 sends error messages 332, 342, 356, 366, 374 to flow caches 344, 358, 368, 376 of each network node 302, 304, 306, 308, 310. To remove the list 348.

4 is a diagram illustrating a flow information structure generated and transmitted in a terminal and an access router according to an exemplary embodiment of the present invention.

FIG. 4 shows components 402 of the session flow information generated and transmitted in the access terminal and the access terminal in FIGS. 2 and 3, flow list information 406 of the session configured in the source terminal based on the access terminal, and routers on the path. And components of the flow cache information 404 of the session configured in the destination terminal are shown. The components of the flow list 406 and the flow cache 404 refer to values of the region defined in the IPv6 packet header, and the source IP address, which is a component, indicates the IP address of the source, and the destination IP. The Destination IP Address represents the IP address of the destination. In addition, the traffic class (Traffic Class) represents the required QoS information, the idle timer (Idle_Timer) is a timer value for maintaining the flow information of each session.

As described above, the present invention delivers and processes QoS information to a router and a destination terminal on a path for guaranteeing flow-based QoS in an IPv6-based service network.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by those equivalent to the scope of the claims.

In the present invention operating as described in detail above, the effects obtained by the representative ones of the disclosed inventions will be briefly described as follows.

The present invention is capable of providing flow-based service quality, which is a disadvantage of the differential service scheme, in a broadband IPv6 network such as BcN, and flow-based service quality of end-to-end to a user terminal without restriction on the scalability of the integrated service scheme. Can be provided. In addition, the end-to-end flow-based quality of service providing method can be applied as it is in the mobile environment due to wired / wireless integration.

Claims (8)

As a flow-based quality of service (QoS) providing method in an IPv6 service network, When the session service forming one flow is generated, verifying QoS related flow information by transmitting a flow service request message from an originating terminal to an access router of a network node; Receiving flow information verified from the access router at the source terminal to construct a flow list, and transmitting a reception success message to the access router; Receiving an Ack message at the access router to configure a flow cache which is service session information of a source terminal; Transmitting, by the source terminal, a reconstructed packet including flow information in an IPv6 hop-by-hop extension header to the access router;  Comparing the flow information in the extension header of the packet received by the access router with the flow cache information configured in the access router; If it is possible to accept the flow service of the source terminal as a result of the comparison, transmitting a packet including flow information to a network node on a path; Checking the flow information delivered to a router or a destination terminal that is a network node on the path and performing service admission control according to network available resources; Flow based service quality providing method in an IPv6 service network comprising a. The method of claim 1, The verification process, Delivering, by the access router, QoS related flow information included in the flow service request message received from the source terminal to a network management server; Checking flow information delivered from service information for each service subscriber previously stored in the network management server; If the identification is confirmed, transmitting the flow information to the source terminal through the access router. Flow based service quality providing method in an IPv6 service network comprising a. The method of claim 1, The comparing process, Transmitting an error message to a previous network node if the network node fails to accept the flow service of the source terminal; Removing the flow cache stored on the network node The flow-based quality of service providing method in the IPv6 service network further comprising. The method of claim 1, The flow-based service quality providing method in the IPv6 service network, characterized in that the flow resource is restored when there is no service transmission for a predetermined time by setting the idle timer (Idle_Timer) value in the configured flow cache and flow list.  As a flow-based quality of service system in an IPv6 service network, When the session service forming one flow is started, a flow service request message is transmitted to an access router, when flow information is received from the access router, a flow list is constructed, and an acknowledgment message is received by the access router. And a source terminal for transmitting the reconstructed packet to the access router, including the flow information in the IPv6 hop-by-hop extension header, Verifying the flow service request message received from the source terminal, transmitting the verified flow information to the source terminal, comparing the flow information in the extension header of the packet transmitted from the source terminal with the configured flow cache information, The access router for transmitting a packet including flow information to a network node on a path, if service is available; Checking the flow information of the source terminal transmitted from the access router to perform service admission control according to network available resources, configuring flow cache information that is flow-based QoS information, and delivering the flow information to a next network node; Network node or destination terminal Flow based service quality providing system in an IPv6 service network comprising a. The method of claim 5, The system, Receiving flow information from the access router, and confirms the flow information received from the service information for each service subscriber stored in advance, and if confirmed, includes a network operating server for delivering the flow information to the access router Flow-based Quality of Service System in IPv6 Service Network. The method of claim 5, The network node, If the flow service of the source terminal is not received, flow-based quality of service providing system in the IPv6 service network, characterized in that for transmitting an error message to the forwarded network node and removes the stored cache cache information. The method of claim 5, A flow-based service in an IPv6 service network, wherein an idle timer (Idle_Timer) is set in a flow cache and a flow list configured in the source terminal or a network node, and there is no transmission of a service for a predetermined time. Quality offer system.

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