With consideration of the invalid registration flows and load balance problems in hierarchical mobile IPv6 (HMIPv6) networks, a collaborative load control scheme (COLC) for HMIPv6 networks is proposed to reduce registration flows and balance load. In COLC, mobile anchor point (MAP) is allowed to transfer part of its packet delivery load to its neighboring MAPs with lower load, by which the invalid registration flows decrease, and more mobile nodes (MNs) register with their favorite MAPs without capacity expansion. The validities of the scheme in reducing registration flows of HMIPv6 and performing better load balance are examined in the simulations.
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