IP MOBILITY SUPPORT WITH IP-SQUARED (IP2) ENCAPSULATION TECHNIQUE

This paper proposes a protocol to support mobility in the Internet wit h a new encapsulation technique, IF-squared (IP2). A basic idea to sup port mobility is as follows; 1) to define two IF addresses for each mo bile host that indicate the host itself and its geographical location (logical and geographical identifiers), 2) to maintain an association of the logical identifier with the geographical identifier and 3) to c ontinue communications between hosts by converting their logical ident ifiers to the corresponding geographical identifiers dynamically where ver they migrate. The association is called mobility binding. A goal o f IP2 is to propose a mobility support feature which can simultaneousl y realize efficient routing paths to mobile hosts and less control tra ffics to maintain the mobility bindings into the current Internet Prot ocol without any modifications to both the conventional protocols and nodes. IP2 forms the efficient routing paths by enabling intermediate nodes to process the encapsulated datagrams. The key technique for thi s Feature is a new header detection algorithm based on CRC checksum ca lculation and an effective usage of a header structure. Percentage of efficient routing paths can be adaptively controlled, depending on dis positions of the nodes which can en- and de-capsulate datagrams approp riately based on the detection algorithm and the mobility bindings. Th e mobility binding must be updated whenever a mobile host migrates to another network. IP2 adopts an updating scheme combining self refreshm ent and on demand updating modes with taking a mechanism to form the e fficient routing paths into considerations. It is shown that IP2 can a chieve both an efficient routing path formation and a low traffic for mobility binding maintenance through analytical evaluations.