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Implementation-Based Evaluation of a Full-Fledged Multihop TDMA-MAC for WiFi Mesh Networks

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Title Implementation-Based Evaluation of a Full-Fledged Multihop TDMA-MAC for WiFi Mesh Networks
 
Creator SEVANI, V
RAMAN, B
JOSHI, P
 
Subject Wireless mesh networks
TDMA MAC protocol
TDMA mesh networks
 
Description Wireless mesh networks in general, and WiFi mesh networks in particular, offer a cost-effective option to provide broadband connectivity in sparse regions. Effective support for real-time as well as high throughput applications requires a TDMA-based approach. However, multihop TDMA implementations in wireless have been few and far-between, and for good reasons. These present significant issues in terms of time synchronization, TDMA schedule dissemination, multichannel support, routing integration, spatial reuse and so on. And achieving these efficiently, in the face of wireless channel losses presents a formidable challenge. In this work, we present an implementation of LiT MAC, a full-fledged multihop TDMA MAC, on commodity WiFi platforms. We undertake extensive evaluations using microbenchmarks as well as application level performance, using outdoor as well as indoor testbeds. We also present an integration of LiT MAC with various routing metrics, and a routing stability study of recently proposed routing metrics (ROMA, SLIQ). Our results show that we can achieve mu s granularity time synchronization across several hops, and TDMA slot size as small as 2 ms. These imply low control overheads. Experiments over several days, on our nine-node outdoor testbed shows that LiT MAC's soft-state-based approach is effective in robust operation even in the presence of significant external interference.
 
Publisher IEEE COMPUTER SOC
 
Date 2014-12-28T14:21:49Z
2014-12-28T14:21:49Z
2014
 
Type Article
 
Identifier IEEE TRANSACTIONS ON MOBILE COMPUTING, 13(2)392-406
1536-1233
1558-0660
http://dx.doi.org/10.1109/TMC.2012.251
http://dspace.library.iitb.ac.in/jspui/handle/100/16740
 
Language English