Looking at Large Networks: Coding vs. Queueing

— Traditionally, network buffer resources have been used at routers to queue transient packets to prevent packet drops. In contrast, we propose a scheme for large multi-hop networks where intermediate routers have no buffers for queueing transient packets. In the proposed scheme, network storage resources (memory) are used only at source and destination nodes to encode/decode packets using random linear coding over time. Our scheme utilizes the observation that for large networks with many flows through each router, if packet loss occurs in a flow path, it will very likely occur only at only one link in the path. Unfortunately, the location of this congested link varies with time, hence, preventing static buffer allocation strategies from exploiting this observation. We propose network coding as a means of “sharing” memory across links along a flow path. We call this spatial buffer multiplexing – where buffering and coding implemented at the source compensates for packet los...

• Type: Conference
• Year: 2006
• Where: INFOCOM
• Authors: Sandeep Bhadra, Sanjay Shakkottai
• Keywords: Communications, INFOCOM 2006, Network Buffer Resources, Packet Drop, Transient Packets