An Approach for Scalable Proxy Mobile IPv6

Because of its salient features such as ease of deployment, Proxy Mobile IPv6 (PMIPv6) is a promising solution for mobility management and is attracting considerable attention among the telecommunication and Internet communities. To the best of our knowledge, however, it is still an open issue how to build a scalable PMIPv6 domain so that a PMIPv6 domain is able to support as many mobile nodes (MNs) as possible while keeping low handover delay. In this paper, we propose an approach for building Scalable And Robust PMIPv6 (SARP) domains. We propose that every mobile access gateway (MAG) behaves as both an MAG and a local mobility anchor (LMA). All MAGs in a proxy mobility domain then organize into a ring and (key = MN-identifier, value = MN´s LMA) pairs are distributed to all MAGs using consistent hashing. In this way, every MAG can send proxy binding update messages to the LMA identified by hashing the MN-identifier of the MN. We show that SARP is robust, scalable, and has very low handover delay. In particular, our results show that with SARP, a single PMIPv6 domain is able to support 10⁸ MNs.