ISSN : 1796-2056
Volume : 1    Issue : 2    Date : June 2006

Design of a Prioritized Error Control Scheme based on Load Differentiation for Time Sensitive
Traffic on the Wireless LAN
Mikyung Kang, Junghoon Lee, Yongmoon Jin, Gyung-Leen Park, and Hanil Kim
Page(s): 45-51
Full Text:
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This paper proposes and analyzes the performance of a prioritized error control scheme for time
sensitive application on the wireless sensor network. As a modified version of IEEE 802.11 WLAN,
the proposed scheme further divides DCF into H-DCF and L-DCF without changing PCF, aiming at
maximizing the successful retransmission of a packet that carries critical data. While channel
estimation elminates the unnecessary polls to the sensor node currently unreachable during PCF,
two DCF subperiods enable prioritized error recovery by making only the high priority packet be
retransmitted via H-DCF. A good chop value, which distributes the retransmission to each period,
can maximize recovered weight, or criticality, minimizing the possible degradation of network
throughput. The simulation results show that the proposed scheme can improve recovered weight
by 8% while showing 97% successful transmission at maximum for the given simulation parameter.

Index Terms
Time-sensitive application, wireless sensor network, IEEE 802.11 WLAN, Prioritized error control,
Packet criticality