The Optimization on Macro Handover of Hierarchical Mobile IPv6
|Course||Applied Computer Technology|
|Keywords||Hierarchical Mobile IPv6 Mobility Anchor Macro switch Register Binding Update Switching delay Packet loss rate|
IPv6 mobility as the core of the next generation Internet, there is good support. However, the video, audio and other higher business and mobile communication requirements of real-time transmission of 3G and 4G technology requirements in the process of moving seamlessly smooth handoff handover performance of mobile IPv6 higher requirements. IETF has proposed a series of standards such as RFC3775, RFC4068, RFC4140, etc., MIPv6 Mobile IPv6 standard switching, fast switching FMIPv6 and level switch HMIPv6 describe quickly switch link prediction and tunneling mechanism level switching introduce mobile anchor MAP locally incorporated these in varying degrees to reduce the handover latency, improved switching performance, but at the same time there are some problems, such as the HMIPv6 Mobile node MN macro mobility complex binding update process, resulting in a longer registration delay. Existing mobile IPv6 macro switch on level study, the mobile node to start configuring the care-of address macro mobile, and duplicate address detection network layer switching registered, and then to move the anchor point, and finally to the registration of the home agent and the correspondent node Compared with the MIPv6, and increased to the MAP registration process, an increase of the switching delay, the process of switching in the macro can not be optimized. To solve the problem, we propose a tunneling mechanism is applied to the level switching optimization program TBFMH the main work: 1) the part of the network layer switching operation in advance, according to the switching information to the care-of address, and duplicate address detection to ensure the address only. 2) local binding update with the second floor switch before the tunnel to establish the operation to be executed in parallel, mainly by improving the original message, the node receiving the message bind operation. Only when mobile nodes to reach the new MAP domain the basic MIPv6 registration process, compared with the original HMIPv6 macro switch, reducing the cost of binding registration to reduce the total handoff delay. 3) In order to reduce the possibility of packet loss, the program by establishing the tunnel between the MAP to forward the handover process of the data packet by the MAP to be cached, when the mobile node enters a new link MAP then these packets are sent to the MN. 4) by means of NS2 simulation the platform and FHMIP1.3.1 expansion module, to construct a suitable topology, HMIPv6 and TBFMH, simulation, and the experimental data were analyzed and compared. The experimental results show that, compared with the original protocol, TBFMH not only reduce the handover delay, but also reduces the packet loss rate and significantly improve the overall performance of the macro switching.