Patent ID: 9191863
Filing Date: 2015-11-17
Classification: H04L,H04W

Abstract:
1. A bandwidth guaranteeing method in an MPLS (MULTI PROTOCOL LABEL SWITCHING) network adopting adaptive modulation, comprising the steps of: setting an adaptive modulation changeover margin that is based on communication quality of a radio transmission channel section; prior to performing the adaptive modulation, in the adaptive modulation changeover margin, according to a deterioration condition of the communication quality, reserving a bandwidth of an alternative LSP (Label Switched Path) for establishing an alternative path by restoration for an LSP being established in the radio transmission channel section and continuing communication by performing changeover to the alternative path using the alternative LSP; discriminating an LSP which requires the restoration among the LSPs established in the radio transmission channel section and instructing the initiator node to reserve a bandwidth of the alternative path, when the communication quality has reached a predetermined first threshold value in the adaptive modulation changeover margin; and instructing the initiator node to perform changeover to the alternative LSP for which a bandwidth has been reserved, when the communication quality has reached a second threshold value which indicates further deteriorated state more than the first threshold value.