Real-time mixed-traffic wireless networks
Hong Ye
Walsh, G.C.
Bushnell, L.G.
Dept. of Mech. Eng., Maryland Univ., College Park, MD;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Oct 2001
Volume: 48,
Issue: 5
On page(s): 883-890
ISSN: 0278-0046
References Cited: 11
CODEN: ITIED6
INSPEC Accession Number: 7070147
Digital Object Identifier: 10.1109/41.954551
Current Version Published: 2002-08-07
Abstract
In this paper we introduce a new protocol, prioritized carrier
sense multiple access with collision avoidance, for real-time wireless
local area networking. Wireless networks increasingly will be called
upon to carry mixed traffic, some portion of which will be devoted to
real-time control and monitoring. Our protocol, based upon the IEEE
802.11 wireless standard, mixes real-time traffic with standard
multimedia data in a way which assures loop stability. Scheduling the
real-time traffic is the primary issue considered. Under our framework,
we propose and validate several new algorithms for dynamically
scheduling the traffic of wireless networked control systems: constant
penalty, estimated error order and lag first-order schemes. All
algorithms are compared via simulation and the results show that dynamic
scheduling algorithms achieve better system performance on average than
static scheduling algorithms like fixed-order polling. The results of a
real experiment involving two dryer plants and three IEEE 802.11 nodes
are reported with static scheduling employed as it lower bounds the
closed-loop behavior
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