Patent ID: 7382726
Filing Date: 2008-06-03
Classification: H04L,Y02D

Abstract:
1. A communication method, which is for a bi-directional dual ring communication system including a plurality of node systems, the communication method comprising: (a) with congestion occurring in a first node system, the first node system generating a congestion information packet and forwarding the generated congestion information packet to an upper node system positioned in a direction opposed to a direction of forwarding a data packet; b) a second node system determining whether or not it is the last node involved in the congestion, upon receiving the congestion information packet; (c) the second node system adding its congestion-related information to the congestion information packet and forwarding the congestion information packet to an upper node system, when the second node system is not the last node involved in the congestion; (d) the second node system performing bandwidth allocation for individual node systems based on information included in the congestion information packet, when the second node system is the last node involved in the congestion; and (e) after performing the bandwidth allocation, the second node system generating a bandwidth allocation packet and transmitting the generated bandwidth allocation packet to the individual node systems involved in the congestion, thereby causing the corresponding node systems to vary their transmission bandwidth and relieve congestion.