Research And Implementation Of Mobility Management Technologies For Network Mobility

With the rapid development of communications technologies and wireless networks, along with the popularity of various mobile terminals and the emergence of new mobile service and applications, people are no longer satisfied with the current accessing methods to Internet, which include fixed terminals or a single mobile terminal, but hope to be able to use a group of interconnected set of fixed or mobile terminals to form a relatively stable movement unit, known as the mobile sub-network or mobile network. Mobile networks can provide uninterrupted Internet services at any time and any place.The Network Mobility Basic Protocol (NEMO) is a new technology of studying the mobile network. The protocol introduces the mobile router (MR) as a default gateway accessing to the Internet. By the care-of address registration, it can be ensured that all mobile nodes within the subnet can maintain business continuity when MR changes its Internet access point. However, in the coexistence of IPv4 and IPv6 networks and multi-access heterogeneous network environment, the existing NEMOv6 protocol only support IPv6 care-of address registration, without the IPv4 care-of address registration support. So when the mobile sub-network moves in the heterogeneous networks, it is difficult to ensure business continuity.This paper first introduces the research background of mobile network and the work mechanisms of mobile IP technology, According to this background, basic mechanisms of the NEMO protocol is further studied, and NEMO protocol is extended to support IPv4 and the registration of multiple Care-of Address. IPv4 care-of address registration functions is completed, through the introduction of extended mobile detection mechanism, using the binding registration, monitoring function of multiple interfaces, and IPv6-in-UDP tunnel encapsulation format based on the Linux system. By building a single-access network test environment, we test the signaling process and FTP data transfer while MR with a single interface to switch between the IPv6 and IPv4 networks, verify the feasibility and correctness of the extension solution in WLAN environment, and test the handoff performance. To test the running status of the expansion solution in a heterogeneous network environment, we configure MR with WLAN, GPRS and TD-SCDMA three kinds of network interfaces further, test handoff delay, FTP data transfer and VLC video streaming in a multi-access and heterogeneous network environment, and verify that the extension programs in heterogeneous network environment is feasible.