EQPR: Enhancing QoS in Named Data Networking using Priority and RTT Driven PIT Replacement Policy

Abstract

Named Data Networking (NDN) is a newly-emerging future Internet Architecture which focuses on content rather than hosts. It changes the communication model from ‘delivering content to a specific host’ to ‘fetching content by using names’. One of the major components in NDN is Pending Interest Table (PIT). Its unique design brings the following advantages in NDN: anonymity, loop-free forwarding, multipath delivery, and multicast. One of the key challenges in NDN is choosing the appropriate PIT size. Current NFD (NDN Forwarding Daemon) does not limit the PIT size. Over-allocation of the PIT does not help in improving network performance. So, PIT needs to have a limited size. However, under bursty traffic, the PIT may become full. In this paper, we present a novel PIT replacement policy called EQPR. It evicts the existing entry based on two factors: Priority and Estimated Round Trip Time (RTT), aiming towards achieving Quality of Service for the valuable users who pay an additional cost for better service. We evaluate EQPR using ndnSIM simulator and compare the results with basic NDN under moderate to high traffic. Simulation results show that EQPR maintains a similar overall satisfaction rate as Basic NDN and most importantly it provides 99.7% Interest satisfaction rate for valuable users.