Mobile communication access system, packet transfer device, and path re-establishing method

Abstract

Disclosed is a technique for providing a mobile communication access system, etc., that can eliminate the useless consumption of resources due to route redundancy, reduce the load on the processing, such as the setup of an LSP, performed by an ingress LSR, avoid an increase in the length of a signal route for setting up an LSP, suppress a delay in providing a notification of a change for an egress LSR to which a mobile terminal is to be connected, and perform a rapid handover process. According to this technique, based on identification information for a second edge device 101b that is received from a mobile terminal 100, a first edge device 101a determines whether an output interface that has been decided on for the second edge device is the same as an input interface for a path that has been established for the mobile terminal, and when the interfaces are the same, transmits a path request message to the other packet transfer device. This packet transfer device determines whether the output interface that has been decided on for the second edge device is the same as the input interface for the path that has been established for a mobile terminal, and when the interfaces are not the same, transmits the path message to the output interface and re-establishes the path in accordance with a reserve message.

Description

technical field [0001] The present invention relates to a mobile communication access system, a packet transmission device, and a path reconstruction method for controlling path changes in label switching technologies such as MPLS (Multi Protocol Label Switching, Multi Protocol Label Switching) that uses labels to transmit data. Background technique [0002] As a conventional label switching technique, a standard protocol technique constituting an LSP (Label Switching Path) is disclosed in Non-Patent Document 1 below. The technique disclosed in Non-Patent Document 1 is a protocol that constitutes a point-to-point path, and makes the exchange of PATH messages and Resv messages through an ingress LSR (Label Switching Router) and an egress LSR working as an edge (edge). Possibly, thereby forming a label path and reserving bandwidth (reserve band). On the other hand, standardization is underway to form paths for point-to-multipoint paths for multicasting and the like, and this ...

AI Technical Summary

Problems solved by technology

For mobile communication in which the mobile terminal moves while sequentially changing the egress LSR, the delay in communication with the ingress LSR for notifying the change of the egress LSR increases according to the increase in the network size

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