Patent ID: 8130646
Filing Date: 2012-03-06
Classification: H04L

Abstract:
1. A method of reserving resources in an IP-based mobile network environment including a mobile node which performs a handover, the method comprising: transmitting query messages from the mobile node to a plurality of adjacent access routers using a plurality of CoAs (care of address); transmitting the query messages from the plurality of adjacent access routers to a crossover node; recording available resource information in the query messages by at least one intermediate node located between the plurality of adjacent access routers and the crossover node on each of a plurality of communication paths, while the query messages are transmitted to a correspondent node; receiving, from the crossover node, the query messages comprising available resource information of each of the communication paths at the correspondent node; analyzing the available resource information recorded in the received query messages at the correspondent node; selecting a first communication path, from the plurality of communication paths which transferred a query message, that provides available resources required by the mobile node, as a selected communication path; and transmitting a resource reservation message from the correspondent node to the mobile node through the selected communication path, wherein, the recording step comprises, receiving the query messages at the at least one intermediate node on each of a plurality of communication paths; comparing own available resource information of the intermediate node and pre-recorded resource information in the query message, if there is a recorded resource information in the query message, and if not, recording the own available resource information; updating the pre-recorded resource information with the own available resource information as the available resource information, if the own available resource information is smaller than the pre-recorded resource information, otherwise maintaining the pre-recorded resource information; and transmitting the query message comprising the updated or maintained available resource information toward the correspondent node.