Seamless handoff mechanism for multicast service in aviation communication NEMO network

Abstract

The invention discloses a seamless handoff mechanism for multicast service in an aviation communication NEMO (Network Mobility) network. In view of fixity of a flight path of an aircraft, before the aircraft accesses a next foreign domain anchor, a handoff request is sent to the anchor; a multicast agent is added to a multicast group of an aircraft node in advance, breaking of a multicast data flow during a handoff process is avoided, and seamless handoff of the aircraft node is ensured; and the handoff state of the aircraft is judged, the next to-be-accessed anchor is predicted, and a predicted handoff mechanism is carried out in advance, or otherwise, if the predicted mode fails, a handoff mechanism in a reaction mode is carried out. multicast service handoff is carried out on the aircraft node through the mentioned seamless handoff mechanism, the mobile node multicast flow continuity and the message transmission reliability are ensured, the handoff delay is reduced, the tunnel pressure is avoided, and the aviation communication process reliability is improved.

Description

technical field [0001] The invention relates to a multicast technology seamless switching scheme under the aviation NEMO network, effectively solves the problem of multicast service disconnection during the switching process based on the pre-registration technology, and belongs to the technical field of aviation wireless communication. Background technique [0002] ICAO (International Civil Aviation Organization) has adopted IPv6 as the basic protocol of the future IP-based aviation communication network ATN. The communication in the hierarchical ATN network environment is mainly the exchange of data messages between the pilot and the ground control center, and does not involve too much in the air passenger communication level, especially the multicast service. The NEMO working group of the IETF (Internet Engineering Task Force) was established in October 2002. The working group proposed the NEMO basic protocol for the NEMO network, that is, RFC3963. As an extension protoco...

AI Technical Summary

Problems solved by technology

[0005] At present, the method of identity authentication in the NEMO network is mainly implemented through remote joining or bidirectional tunneling in the mobile multicast technology, but in the aviation ATN network, the implementation and deployment of this multicast service implementation method exists Problem: 1. The aviation ATN communication environment has the characteristics of handover in a large geographical area, resulting in a large distance between the local domain and the home domain network. During the signaling interaction process, the transmission delay of message data will increase, resulting in handover The delay increases, and the multicast service is interrupted; 2. In the process of aviation communication, the aircraft travels at high speed on a fixed line. In order to maintain the continuity of the session, the packet loss rate needs to be reduced during the handover process, and the traditional handover process will be between PAR and A two-way tunnel is established between NARs to store the data packets sent during the switching process. Due to the limited storage capacity of the tunnel, data loss and switching overhead will increase; 3. The aviation NEMO network does not deploy a multicast foreign proxy server. Communication bandwidth and node storage capacity are limited, so if the traditional multicast technology is directly applied to the ATN network, the overhead of the handover process will be increased, resulting in an increase in handover delay

[0006] Based on the above problems, the present invention proposes a seamless switching mechanism for multicast services under the aviation communication NEMO network, which effectively solves the security problem of identity authentication in the aircraft switching process

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