Why NEMO protocols do not pre-fetch more than one CoA?

Protocols for managing network mobility (NEMO) should reduce handoff latency significantly to provide uninterrupted Internet connectivity. Since the path of a high-speed vehicle is predefined in most cases, it could be beneficial for a NEMO protocol to pre-fetch care-of-addresses of the potential future cells. However, the current NEMO protocols either do not use pre-fetching or use it for at most one cell. While investigating this behavior of the NEMO protocols analytically, we find that pre-fetching beyond the next one cell does not necessarily improve the handoff performance even though the future route of the vehicle could be known beforehand.