Trade-Off between Cost and Goodput in Wireless: Replacing Transmitters with Coding
We study the cost of improving the goodput, or the useful data rate, to user in a wireless network. We measure the cost in terms of number of base stations, which is highly correlated to the energy cost as well as capital and operational costs of a network provider. We show that increasing the available bandwidth, or throughput, may not necessarily lead to increase in goodput, particularly in lossy wireless networks in which TCP does not perform well. As a result, much of the resources dedicated to the user may not translate to high goodput, resulting in an inefficient use of the network resources. We show that using protocols such as TCP/NC, which are more resilient to erasures and failures in the network, may lead to a goodput commensurate with the throughput dedicated to each user. By increasing goodput, users’ transactions are completed faster; thus, the resources dedicated to these users can be released to serve other requests or transactions. Consequently, we show that translating efficiently throughput to goodput may bring forth better connection to users while reducing the cost for the network providers.
KeywordsNetwork Code Packet Loss Rate Transport Protocol Network Provider Lossy Network
Unable to display preview. Download preview PDF.
- 1.Cisco, Cisco visual networking index: Global mobile data traffic forecast (2011)Google Scholar
- 3.Padhye, J., Firoiu, V., Towsley, D., Kurose, J.: Modeling TCP throughput: A simple model and its empirical validation. In: Proceedings of the ACM SIGCOMM (1998)Google Scholar
- 4.Balakrishnan, H., Padmanabhan, V.N., Seshan, S., Katz, R.H.: A comparison of mechanisms for improving TCP performance over wireless links. IEEE/ACM Transactions on Networking 5 (December 1997)Google Scholar
- 5.Kim, M., Médard, M., Barros, J.: Modeling network coded TCP throughput: A simple model and its validation. In: Proceedings of ICST/ACM Valuetools (May 2011)Google Scholar
- 6.Cáceres, R., Iftode, L.: Improving the performance of reliable transport protocols in mobile computing environments. IEEE Journal on Selected Areas in Communications 13(5) (June 1995)Google Scholar
- 8.Hacker, T.J., Athey, B.D., Noble, B.: The end-to-end performance effects of parallel TCP sockets on a lossy wire-area network. In: Proceedings of the IEEE IPDPS (2002)Google Scholar
- 9.Ford, A., Raiciu, C., Handley, M., Barre, S., Iyengar, J.: Architectural guidelines for multipath tcp development. IETF, Request for Comments, no. 6182 (March 2011)Google Scholar
- 11.Lott, C., Milenkovic, O., Soljanin, E.: Hybrid ARQ: Theory, state of the art and future directions. In: Proceedgins of IEEE Information Theory Workshop (ITW), Bergen, Norway (July 2007)Google Scholar