IP MOBILITY MANAGEMENT

Two basic aspects are envisaged in mobility management:  mobile terminal idle and mobile terminal Active. A signaling traffic load is associated to the mobility tracking procedures, with strong impact into the: Fixed network (With a significant amount of bandwidth) and Radio interface (The electromagnetic resource is rather scarce).

About the implementations in Cellular systems, Vicente Casares talks about the location Management in the different systems:

 2G -> two level hierarchical structures (HLR and VLR) and a cell lay-out configuration in location areas: LA.

 2.5G (GPRS) -> a two level hierarchical structure (SLR and GR as an extension of the HLR) and the cell lay-out configuration as routing Areas

 3G (UMTS) -> A two level hierarchical structure (SGSN and GGSN) and a cell lay-out that combines UTRAN Registration Area and Routing Areas

About the solutions for all-IP networks, two types or levels of mobility are defined:

-Macromobility : The movement of mobile users between two network domains. Is defined by MIP and his enhancement.  MIP allow to move from one network to another without having to make a change in their IP address, allows nodes to maintain all ongoing communications while moving and is scalable, robust and secure. Vicente Casares explains to types: IPv4 and IPv6.

-Micromobility: The movement of mobile users between two subnets within one administrative domain. Diferent tipes of implementations: IDMP: INTRA Domain MM Protocol, MIP-RR (MIP-Regional Registration), HMIP (Hierarchical MIP), CIP (Cellular IP) and HAWAII.