Localized paging in proxy mobile IPv6 networks

In Proxy Mobile IPv6 (PMIPv6) networks, proxy registrations are performed even for idle mobile nodes (MNs), resulting in unnecessary signaling traffic and protocol cost. Although there have been many paging techniques aimed at reducing the unnecessary location updates, those are mainly focused on telecommunication systems and how to adopt IP paging schemes in PMIPv6 is not yet well studied. In this paper, we introduce a new paging scheme that optimizes paging performance in a localized manner. The proposed localized paging scheme pages the idle MN through a mobility access gateway (MAG) while the operation is transparent to a local mobility anchor (LMA) in a PMIPv6 network domain. In this way, a bottleneck risk at the LMA can be avoided, without a huge requirement of buffer size and paging singling cost. We develop a thorough analytical model for evaluating the performance of the proposed scheme, compared with a LMA-based paging scheme in terms of the buffer size requirement and signaling cost. Analytical results demonstrate that the proposed paging scheme can significantly reduce the signaling cost for PMIPv6, achieving a less buffer size requirement and of course shorter paging delay, compared with those of the LMA-based paging scheme.