Preserving bandwidth using a lazy packet discard policy in ATM networks
Azer Bestavros, Gitae Kim · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 1999
In this paper, we introduce Lazy Packet Discard (LPD), an AAL-level enhancement that improves effective throughput, reduces response time, and minimizes wasted bandwidth for TCP/IP over ATM. In contrast to the SCD and EPD policies, LPD delays as much as possible the removal from the network of cells belonging to a partially communicated packet. LPD preserves network bandwidth by keeping such cells alive and by ensuring that additional cells, obtained through Reed- Solomon block coding at the sender's AAL, are eventually transmitted to salvage the packet in question. We outline the implementation of LPD and show the performance advantage of TCP/LPD, compared to plain TCP and TCP/EPD through analysis and simulations.