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A beacon interval shifting scheme for interference mitigation in body area networks.

Kim S, Kim S, Kim JW, Eom DS - Sensors (Basel) (2012)

Bottom Line: IEEE 802.15 Task Group 6 presented several schemes to reduce such interference, but these schemes are still not proper solutions for BANs.We present a novel distributed TDMA-based beacon interval shifting scheme that reduces interference in the BANs.The simulation results show that the proposed scheme has a lower packet loss, energy consumption, and delivery-latency than the schemes of IEEE 802.15 Task Group 6.

View Article: PubMed Central - PubMed

Affiliation: Department of Electrical Engineering, Korea University, Seoul 136-713, Korea. kskkck@korea.ac.kr

ABSTRACT
This paper investigates the issue of interference avoidance in body area networks (BANs). IEEE 802.15 Task Group 6 presented several schemes to reduce such interference, but these schemes are still not proper solutions for BANs. We present a novel distributed TDMA-based beacon interval shifting scheme that reduces interference in the BANs. A design goal of the scheme is to avoid the wakeup period of each BAN coinciding with other networks by employing carrier sensing before a beacon transmission. We analyze the beacon interval shifting scheme and investigate the proper back-off length when the channel is busy. We compare the performance of the proposed scheme with the schemes presented in IEEE 802.15 Task Group 6 using an OMNeT++ simulation. The simulation results show that the proposed scheme has a lower packet loss, energy consumption, and delivery-latency than the schemes of IEEE 802.15 Task Group 6.

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Delivery ratio of data according to the number of BANs.
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f14-sensors-12-10930: Delivery ratio of data according to the number of BANs.

Mentions: As shown in Figure 14, the delivery ratio of data exhibits a similar form as that of the delivery ratio of beacons in the mobile case. The delivery ratio of data in the basic scheme and the beacon shifting scheme falls as the number of BANs increases. The slope, however, is less steep than in the stationary case because the mobility of the BANs leads to less interference with each other, and the reduced interference decreases the number of packet losses and buffer overflow. The delivery ratio of the beacon interval shifting scheme gradually decreases as the number of BANs increases. Unlike the stationary case, buffer overflow seldom occurs because of the reduced interference. However, our scheme experiences some packet losses, which rarely happen in the stationary case. In the stationary case, packet losses can be avoided by performing carrier sensing before the beacon transmission. However, in the mobile case, the active period of BANs may partially overlap because the channel state is continuously changing. This degrades the delivery ratio of data, but the beacon interval shifting scheme still shows better performance than the other schemes.


A beacon interval shifting scheme for interference mitigation in body area networks.

Kim S, Kim S, Kim JW, Eom DS - Sensors (Basel) (2012)

Delivery ratio of data according to the number of BANs.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3472867&req=5

f14-sensors-12-10930: Delivery ratio of data according to the number of BANs.
Mentions: As shown in Figure 14, the delivery ratio of data exhibits a similar form as that of the delivery ratio of beacons in the mobile case. The delivery ratio of data in the basic scheme and the beacon shifting scheme falls as the number of BANs increases. The slope, however, is less steep than in the stationary case because the mobility of the BANs leads to less interference with each other, and the reduced interference decreases the number of packet losses and buffer overflow. The delivery ratio of the beacon interval shifting scheme gradually decreases as the number of BANs increases. Unlike the stationary case, buffer overflow seldom occurs because of the reduced interference. However, our scheme experiences some packet losses, which rarely happen in the stationary case. In the stationary case, packet losses can be avoided by performing carrier sensing before the beacon transmission. However, in the mobile case, the active period of BANs may partially overlap because the channel state is continuously changing. This degrades the delivery ratio of data, but the beacon interval shifting scheme still shows better performance than the other schemes.

Bottom Line: IEEE 802.15 Task Group 6 presented several schemes to reduce such interference, but these schemes are still not proper solutions for BANs.We present a novel distributed TDMA-based beacon interval shifting scheme that reduces interference in the BANs.The simulation results show that the proposed scheme has a lower packet loss, energy consumption, and delivery-latency than the schemes of IEEE 802.15 Task Group 6.

View Article: PubMed Central - PubMed

Affiliation: Department of Electrical Engineering, Korea University, Seoul 136-713, Korea. kskkck@korea.ac.kr

ABSTRACT
This paper investigates the issue of interference avoidance in body area networks (BANs). IEEE 802.15 Task Group 6 presented several schemes to reduce such interference, but these schemes are still not proper solutions for BANs. We present a novel distributed TDMA-based beacon interval shifting scheme that reduces interference in the BANs. A design goal of the scheme is to avoid the wakeup period of each BAN coinciding with other networks by employing carrier sensing before a beacon transmission. We analyze the beacon interval shifting scheme and investigate the proper back-off length when the channel is busy. We compare the performance of the proposed scheme with the schemes presented in IEEE 802.15 Task Group 6 using an OMNeT++ simulation. The simulation results show that the proposed scheme has a lower packet loss, energy consumption, and delivery-latency than the schemes of IEEE 802.15 Task Group 6.

Show MeSH
Related in: MedlinePlus