An MPLS-based handover solution for cellular networks

The convergence of wireless networks can primarily be observed in cellular networks that are going to comprise a variety of different access technologies. The handover solutions currently deployed in the core networks of cellular systems will thus have to be extended or replaced in order to allow seamless packet-switched services between the legacy and the new access technologies. In this paper, a new MPLS-based handover solution is presented, primarily aiming at real-time packet-switched services in the core networks of cellular systems. The main advantages over other solutions are efficiency and scalability. The solution avoids long signalling delays arising when a handover notification message is issued during handover from an old point of attachment to a new one. This is done by continuously rerouting packets to the new point of attachment while the handover notification message travels through the network. The solution also avoids the establishment of per-user paths so that scalability is achieved.