PITA Fiscal Year 2013 Projects

Filtering Packet Delay Variations In Wireless Backhaul Networks For Precise Time Distribution

Lead University: Lehigh University
PI: Shalinee Kishore, Dept. of Electrical & Computer Engineering
Co-PI(s): Rick Blum, Dept. of Electrical & Computer Engineering
PA Industry: LSI Corp.

Wireless networks have undergone significant advances in the last two decades. The most recent advancements have placed increasing pressure on the wireless backhaul network to support higher and higher data rates in a scalable and low-cost manner. For this reason, current and future wireless backhaul networks will be packet-based, i.e., data will be transmitted and routed independently in segments known as packets. As is the case of earlier generations of wireless backhaul networks, packet-based wireless backhaul networks require highly accurate timing sychronization across the entire network. Packet-based timing schemes to enable this type of synchronization have been developed and standardized; they aim to ease deployment of timing synchronization at any node in the backhaul network, at any location and time. However, due to the unpredictable nature of packet-based networks, in which packets can arrive at a destination node with variable delay, the accuracy of such schemes cannot be assured or kept within tolerable limits. The proposed work aims to study packet delay variation characteristics in wireless backhaul networks to devise algorithms for reducing the expected value of this variation to a specified frequency offset. The efficiacy of the proposed schemes will be studied via simulations. The project is a collaboration between the Lehigh team and System Architecture Group at the LSI facilities in Allentown, PA. LSI is an electronics company that develops semiconductors and software for mobile network technologies.