  BM compression is a straightforward and operable way to reduce buffer message
length as well as to improve system performance. In this paper, we thoroughly
discuss the principles and protocol progress of different compression schemes,
and for the first time present an original compression scheme which can nearly
remove all redundant information from buffer message. Theoretical limit of
compression rates are deduced in the theory of information. Through the
analysis of information content and simulation with our measured BM trace of
UUSee, the validity and superiority of our compression scheme are validated in
term of compression ratio.
