Thomas Kunz
Systems and Computer Engineering
406
Snoop: Network Layer Solution
nidea: modify network
layer software at base station
nchanges are
transparent to MH and FH
–no changes in TCP semantics (unlike I-TCP)
–less software overhead (packets pass TCP layer only
twice)
–no application relinking on mobile host
nmodifications are
mostly in caching packets and performing
local retransmissions across the wireless link by monitoring (snooping) on TCP acks
nresults are
impressive:
–speedups of up to 20 times over regular TCP
–more robustness when dealing with multiple packet losses