Service prioritization among different traffic classes is an important goal for the future Internet. Conventional approaches to solving this problem consider the existing best-effort class as the low-priority class, and attempt to develop mechanisms that provide ``better-than-best-effort" service. We explore the opposite approach, and devise a new distributed algorithm to realize a low-priority service (as compared to the existing best effort) from the network endpoints. To this end, we develop TCP Low Priority (TCP-LP), a distributed algorithm whose goal is to utilize only the excess network bandwidth as compared to the ``fair share" of bandwidth as targeted by TCP. The key mechanisms unique to TCP-LP congestion control are the use of one-way packet delays for congestion indications and a TCP-transparent congestion avoidance policy.

On the other hand, HSTCP-LP (High-Speed TCP Low Priority) is an advanced TCP version targeted towards fast long-distance networks (i.e., networks operating at 622 Mb/s, 2.5 Gb/s, or 10 Gb/s and spanning several countries or states).� HSTCP-LP is a TCP-LP version with aggressive window increase policy. More details on HSTCP-LP could be found below.�

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