Patent ID: 8233487
Filing Date: 2012-07-31
Classification: H04J,H04L,H04Q

Abstract:
1. A communication network system comprising plural data transfer equipment elements of data transfer equipment, the communication network system establishing a communication path by transferring a communication path establishment control signal among at least two of the data transfer equipment elements, wherein the data transfer equipment comprises a control information forwarding means; wherein the communication path establishment control signal includes a service identifier of a service provided by the communication path and a service attribute which characterizes the service identified by the service identifier, wherein the data transfer equipment holds an achievable maintenance condition for each network resource that is an attribute related to maintenance of the network resource; wherein the data transfer equipment specifies a required maintenance condition for the communication path to be established by the communication path establishment control signal including the service identifier and the service attribute; and wherein the data transfer equipment compares the specified required maintenance condition with the achievable maintenance condition to select a network resource that satisfies the required maintenance condition as a network resource used for the communication path to be established by the communication path establishment control signal; and wherein the data transfer equipment includes: a service definition table in which a service identifier, a service attribute, a requirement for maintenance, and adaptation are recorded in association with one another, wherein the achievable maintenance condition is included in a link attribute table in which a link and a maintenance attribute of the link are recorded in association with each other; and the data transfer equipment uses the service definition table to determine the required maintenance condition that should be satisfied by links for hops of a communication path to be established, on the basis of a received service identifier and service attribute, extracts a plurality of links of which maintenance attributes satisfy the determined requirement for maintenance, from the link attribute table, and either determines a candidate for a route of the communication path which satisfies the requirement for maintenance in relation to each of the hops, in a network formed with the extracted plurality of links, or determines an adaptation by searching the service definition table on the basis of the service identifier and service attribute.