FatVAP: Aggregating AP backhaul capacity to maximize throughput

Srikanth Kandula, Kate Ching Ju Lin, Tural Badirkhanli, Dina Katabi

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

96 Scopus citations

Abstract

It is increasingly common that computers in residential and hotspot scenarios see multiple access points (APs). These APs often provide high speed wireless connectivity but access the Internet via independent, relatively low-speed DSL or cable modem links. Ideally, a client would simultaneously use all accessible APs and obtain the sum of their backhaul bandwidth. Past work can connect to multiple APs, but can neither aggregate AP backhaul bandwidth nor can it maintain concurrent TCPs across them. This paper introduces FatVAP, an 802.11 driver that aggregates the bandwidth available at accessible APs and also balances their loads. FatVAP has three key features. First, it chooses the APs that are worth connecting to and connects with each AP just long enough to collect its available bandwidth. Second, it ensures fast switching between APs without losing queued packets, and hence is the only driver that can sustain concurrent high throughput TCP connections across multiple APs. Third, it works with unmodified APs and is transparent to applications and the rest of the network stack. We experiment with FatVAP both in our lab and hotspots and residential deployments. Our results show that, in today's deployments, FatVAP immediately delivers to the end user a median throughput gain of 2.6x, and reduces the median response time by 2.8x.

Original languageEnglish
Title of host publication5th USENIX Symposium on Networked Systems Design and Implementation, NSDI 2008
PublisherUSENIX Association
Pages89-103
Number of pages15
ISBN (Electronic)9781931971584
StatePublished - 2008
Event5th USENIX Symposium on Networked Systems Design and Implementation, NSDI 2008 - San Francisco, United States
Duration: 16 Apr 200818 Apr 2008

Publication series

Name5th USENIX Symposium on Networked Systems Design and Implementation, NSDI 2008

Conference

Conference5th USENIX Symposium on Networked Systems Design and Implementation, NSDI 2008
CountryUnited States
CitySan Francisco
Period16/04/0818/04/08

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