KR20040055449A - Fallback connection service method on universal plug and play network - Google Patents

Abstract

PURPOSE: A fallback connection service method on a UPnP network is provided to drive a backup connection service to flexibly cope with a default connection trouble. CONSTITUTION: A backup connection service is set. when a packet is received from a CP(Control Point) which has not made a connection request and the packet is forwarded through pre-set default connection, it is checked whether a trouble occurs for a default connection service during fallback transition time. If a trouble occurs for the connection service, a TMWConn(True Multiple WAN Connection)-IGD(Internet Gateway Device) substitutes the trouble-generated default connection service with a backup connection service. The TMWConn-IGD transmits a warning event informing about the connection state change to an active CP which has used the previously set default connection, so that the CP can cope with the connection state change.

Description

FALLBACK CONNECTION SERVICE METHOD ON UNIVERSAL PLUG AND PLAY NETWORK}

The present invention relates to a UPnP network system, and more particularly, to an alternative connection service method for a multiple wide area network (WAN) connection service.

The communication between two or more devices in a home is called a home network.

As an attempt to integrate networks in the current home, Universal Plug and Play (UPnP) has been proposed.

The UPnP standard establishes devices and services. UPnP devices provide services, which consist of actions, state variables, and events.

The control point (abbreviated as CP) calls a service provided by the device as an action, observes state variables, subscribes to events provided by the device, and reads device changes.

The UPnP Internet Gateway Device (IGD, hereinafter abbreviated as IGD) is located at a boundary between a LAN and a WAN constituting a home network to provide Internet access services to devices in the home network. In other words, UPnP version 1.0's IGD features automatic identification in home networks, convenient control of network address translation (NAT), and support for multiple Internet connections.

Therefore, anyone who wants to connect to the Internet using an IGD 1.0 device invokes the RequestConnection action via IGD-CP.

After that, if the connection is granted, the packet can be sent to the IGD from this time.

If connection termination occurs, receive an event from the IGD 1.0 device and report the cause.

The UPnP IGD 1.0 device may be configured with a plurality of wide area network (WAN) connection services.

However, although the current UPnP IGD 1.0 device can be configured with a plurality of wide area network (WAN) connection services, only the default connection service is present in the UPnP IGD 1.0 standard Layer3 forwarding service. Can be set.

In addition, IGD 1.0 devices currently have multiple WAN connectivity services and do not have a mechanism to dynamically use different connectivity.

Accordingly, the present invention provides an alternative connection service method on a UPnP network in which multiple WAN connection services provided by the IGD 1.0 specification provide a backup connection service when a default connection service fails in order to improve a conventional problem. There is a purpose.

1 is a block diagram of an alternative connection service system for an embodiment of the present invention.

2 is an exemplary diagram of a forwarding table in an embodiment of the present invention.

3 is a flowchart illustrating an alternative connection service process according to an embodiment of the present invention.

4 is an operation flowchart showing a CP operation upon receiving an alert event according to an alternate connection in an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

110: TMWConn-IGD 121,122: TMWConn-CP

In the multi-connection service method on a UPnP network comprising the step of providing a predetermined default connection service to the CP when a packet is received without a connection request from any CP to achieve the above object, a backup connection Setting a service, setting an alternative transition time, replacing a backup connection service if a default connection service fails during the replacement transition time, and connecting when the replacement operation to the backup connection service is completed. And transmitting a warning event notifying the status change to the CP.

In addition, when the CP receives the warning event, the CP ignores the warning event and maintains a disconnected state from the previous default connection service. When the CP receives the warning event, the CP requests a connection to the backup connection service. Characterized in that made.

Hereinafter, the present invention will be described in detail with reference to the drawings.

Figure 1 is a block diagram of a multi-forwarding service system for an embodiment of the present invention, as shown therein, a plurality of TMWConn-CP (121) 122, which controls the function of the UPnP Internet function and vendor specifications, TMWConn (True Multiple) that executes UPnP Internet function and vendor specification function under the control of the UPnP device 130 and the TMWConn-CP 121 or 122 and performs packet forwarding of the TMWConn-CP 121 or 122. WAN Connection) -IGD (110) is configured.

The TMWConn-IGD 110 and the TMWConn-CP 121, 122 are configured to have vendor specific functions that are compliant with the UPnP IGD version 1.0 specification to utilize multiple WAN connection services. do.

The TMWConn-IGD 110 determines a vendor specific QoS that is compliant with the UPnP IGD version 1.0 specification in determining which connection to forward a received packet to when forwarding a plurality of connection services. Provides connection service by managing a forwarding table containing relevant information while referring to a connection request from any TMWConn-CP (121 or 122) on the UPnP network by referring to a forwarding entry meeting the QoS requirements of that TMWConn-CP; In case of default connection failure when forwarding connection using QoS service, backup connection service is executed and configured to send warning event notifying connection status change to the corresponding TWMConn-CP.

Referring to the operation and effect of the embodiment of the present invention configured as described above are as follows.

In an embodiment of the present invention, the TMWConn-IGD 110 mounts and manages a forwarding table such as the example of FIG. 2 to determine which connection to forward a received packet to when a plurality of connection services exist.

As shown in the example diagram of FIG. 2, the forwarding table includes a destination address, a prefix length, and a prefix length used when the TMWConn-IGD 110 searches for a forwarding table entry such as a destination address of a received packet. Connection Service Instances, which represent outgoing interfaces to which packets will be forwarded, and the User Interface (UI; User Interface) of the TMWConn-CP 121 or 122 to facilitate management of the forwarding table. It consists of a number of entries including information such as a general description shown as a string.

In the embodiment of the present invention, the TMWConn-CP 121 or 122 defines an action for inserting, deleting, and querying an entry in the forwarding table of FIG. 2.

Accordingly, in the embodiment of the present invention, the TMWConn-IGD 110 includes an improved packet forwarding function that utilizes connection management by a connection request of a CP, whether a default connection is set, and a plurality of forwarding table entries. This is included in the Layer3Forwarding service, which describes the connection service process using the following.

In the embodiment of the present invention, different operations are performed depending on whether the TMWConn-CP 121 or 122 is requested to connect and whether a default connection is established.

First, when a connection request is performed from a TMWConn-CP 121 or 122 to a current connection service instance (ConnectionService Instance), when a packet is received from the TMWConn-CP 121 or 122, the TMWConn-IGD 110 is configured to receive the packet. Forward the packet using the connection service described in the connection request.

If a packet is received without performing a connection request from the TMWConn-CP 121 or 122, the TMWConn-IGD 110 checks whether a default connection is established. Accordingly, if a default connection is established, the TMWConn-IGD 110 forwards the packet using the default connection.

If a packet is received from the TMWConn-CP 121 or 122 that did not perform the connection request, but the default connection is not established, the TMWConn-IGD 110 searches the forwarding table based on the packet's destination address, and Refer to Connection Service Instance to forward the packet.

In addition, the present invention may define and provide a QoS service.

Quality of Service (QoS) refers to various technologies and concepts that differentiate traffic levels according to importance for users or applications, and manage traffic and bandwidth in a limited WAN bandwidth. The QoS solution does not simply increase the network bandwidth by increasing the limited bandwidth, but effectively monitors and analyzes the bandwidth and the traffic generated therein to effectively configure and manage the policy-based network and improve the network management. It is.

That is, in the embodiment of the present invention, the QoS description may be additionally inserted into the forwarding table entry of FIG. The QoS description is information representing a quality characteristic of the connection service and may be represented by a maximum speed (Mbps) value of the corresponding connection.

Accordingly, in the embodiment of the present invention, in effectively performing a multiple WAN connection service, when the TMWConn-CP 121 or 122 performs a connection request (RequestConnetion) action, the TMWConn is referred to by referring to the QoS information of the forwarding table entry. It is possible to provide a connection service that provides the QoS required by the CP 121 or 122.

However, at present, the device of the IGD 1.0 specification does not define a method that allows a different connection to be used in the event of a default connection failure while having multiple WAN connection services.

Therefore, in the embodiment of the present invention, when a default connection failure occurs, the TMWConn-IGD 110 has a function for replacing the failed default connection with a backup service.

That is, when a failure occurs in the default connection service, the TMWConn-IGD 110 replaces the failed default connection service with a backup connection service, which will be described with reference to the operation flowchart of FIG. 3.

First, the SetBackupConnectionService action and the GetBackupConnectionService action are further defined in the TMWConn-IGD 110 to set up the backup connection service.

The TMWConn-IGD 110 further defines a state variable called a fallback transition time and a SetFallbackTransTime action. However, if the alternative transition time value is small, the transition to the backup connection service can be made quickly, but a trade-off may occur even in the case of short-term default connection service failure, so it must be set according to the environment.

Accordingly, when the TMWConn-IGD 110 makes a default connection to the TMWConn-CP 121 or 122, for example, a packet is received from a CP on which a connection request has not been performed and thus packet forwarding is performed through a preset default connection. Check if the default connection service fails during the alternate transition period.

If the connection service fails in the replacement transition period, the TMWConn-IGD 110 replaces the failed default connection service with the backup connection service. Accordingly, the previously established default connection service is placed in the Pending Disconnect state when the idle disconnect time expires as defined in the IGD 1.0 specification.

At this time, the TMWConn-IGD 110 transmits a warning event notifying the connection state change to the Active CP using the default connection previously established for the period specified as Warn Disconnect Delay so that the CP can respond to the connection state change. do.

Accordingly, the TMWConn-CP 121 or 122 receiving the warning event notifying the change of the connection state ignores the warning event and maintains the disconnected state to the preset default connection as shown in the operation flowchart of FIG. In order to use the new connection service, the request connection action can be performed again.

As described in detail above, the present invention provides a plurality of WAN connection services proposed in IGD version 1.0, and when a default connection failure occurs, the backup connection service can be dynamically driven to more flexibly cope with the failure.

Claims (4)

In the multi-connection service method on a UPnP network to perform the step of providing a predetermined default connection service to the CP when the packet is received in the IGD, Setting up a backup connection service, Substituting a backup connection service if a default connection service failure occurs; And when the replacement operation to the backup connection service is completed, transmitting a warning event to the CP informing of a change in the connection state. 2. The method of claim 1, comprising setting an alternate transition time to check whether there is a failure in the default connection service during the alternate transition time. 2. The method of claim 1, comprising ignoring a warning event and maintaining a disconnected state to a previous default connection service. 2. The method of claim 1, comprising requesting a connection to a backup connection service for a warning event.