270 ◾ Weihuang Fu, Kuheli Louha, and Dharma P. Agrawal
© 2011 by Taylor & Francis Group, LLC
additional procedures are needed to enable the transmission using multiple hops
so as to improve the performance. When MN u has the connection with MN v, it
rst transmits a summary vector to v, which is a compact representation of all the
messages buered at u. en, v performs a logical operation to check the dierence
in stored messages at u and v. After that, v sends a request message for the trans-
mission of unknown messages.
For multicopy forwarding, the storage problem becomes important. Multiple
copies of the messages require a larger buer size for a roaming MN. When the buf-
fer size is limited, MN has to make policy and decide which message ...