S. Katti, H. Rahul, W. Hu, D. Katabi, M. Medard, J. Crowcroft, "XORs in the Air: Practical Wireless Network Coding," ACM SIGCOMM Conference, (September 2006). [PDF]

Summary

This paper present COPE, a new forwarding architecture for wireless mesh networks that significantly improves the overall throughput by exploiting the shared nature of wireless medium using Continue Reading ››

S. Biswas, R. Morris, "ExOR: Opportunistic Multi-Hop Routing for Wireless Networks," ACM SIGCOMM Conference, (August 2005). [PDF]

Summary

ExOR is an integrated routing and MAC technique that opportunistically exploits the broadcast characteristics of the wireless environment. Unlike the traditional routing protocols, where the best sequence of nodes from a source to a destination is decided … Continue Reading ››

J. Broch, D. Maltz, D. Johnson, Y-C Hu, J. Jetcheva, "A Performance Comparison of Multi-Hop Wireless Ad Hoc Network Routing Protocols," ACM Mobicom Conference, (October 1998). [PDF]

Summary

This paper presents packet level simulation results of four multi-hop wireless ad hoc network routing protocols: DSDV, TORA, DSR, and AODV, in networks of 50 mobile nodes. … Continue Reading ››

D. De Couto, D. Aguayo, J. Bicket, R. Morris, "A High Throughput Path Metric for Multi-Hop Wireless Routing," ACM Mobicom Conference, (September 2003). [PDF]

Summary

This paper presents ETX (expected transmission count), a new metric to find high-throughput paths on multi-hop wireless networks (802.11b), which minimizes the expected total number of packet transmissions (including retransmissions) … Continue Reading ››

J. Bicket, D. Aguayo, S. Biswas, R. Morris, "Architecture and Evaluation of an Unplanned 802.11b Mesh Network," ACM Mobicom Conference, (September 2005). [PDF]

Summary

Planning and deployment of a large wireless mesh network in a urban area is complex, time-consuming, and expensive . This paper argues that an unplanned wireless mesh network with commodity hardware … Continue Reading ››

Andrei Gurtov, Sally Floyd, "Modeling Wireless Links for Transport Protocols," ACM SIGCOMM Computer Communications Review, Volume 34, Number 2, (April 2004). [PDF]

Summary

Intrinsic characteristics of wireless links (e.g., variable bandwidth, bit corruption, channel allocation delays, and asymmetry) significantly affect performance of transport protocols. In addition, different types of wireless links show noticeable variance in … Continue Reading ››

H. Balakrishnan, V. Padmanabhan, S. Seshan, R. H. Katz, "A Comparison of Mechanisms for Improving TCP Performance over Wireless Links," IEEE/ACM Transactions on Networking, (December 1997). [PDF]

Summary

Unlike wired networks, congestion is not the only source of packet loss in wireless networks. Networks with wireless and lossy links also suffer from significant losses due … Continue Reading ››

V. Bharghavan, A. Demers, S. Shenker, L. Zhang, "MACAW: A Media Access Protocol for Wireless LANs," ACM SIGCOMM Conference, (August 1994). [PDF]

Summary

The media in a wireless network is a shared and scarce resource; as a result, controlling access to this shared media to maximize performance is one of the key issues in wireless … Continue Reading ››

Y. Chen, R. Griffith, J. Liu, A. Joseph, R. H. Katz, "Understanding TCP Incast Throughput Collapse in Datacenter Networks," Workshop on Research in Enterprise Networks (WREN'09), (August 2009). [PDF]

Summary

This paper presents a diagnosis of the TCP incast collapse problem and proposes a framework for a solution that should be:

1. generalized: not limited to … Continue Reading ››

V. Vasudevan, A. Phanishayee, H. Shah, E. Krevat, D. G. Andersen, G. R. Ganger, G. A. Gibson, B. Mueller, "Safe and Effective Fine-grained TCP Retransmissions for Datacenter Communication," ACM SIGCOMM Conference, (August 2009). [PDF]

The TCP Incast Collapse Problem

In data centers with high-fan-in, high-bandwidth synchronized TCP workloads, receivers can experience a drastic … Continue Reading ››