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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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Average end-to-end delivery-latency according to the number of BANs.
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f12-sensors-12-10930: Average end-to-end delivery-latency according to the number of BANs.

Mentions: Delivery-latency is also an important factor determining the performance of a BAN. In this paper, the end-to-end delivery-latency indicates the duration from the occurrence time of application data at a sender to the arrival time of the data at a receiver. This is different meaning from the network delivery-latency in Figure 8. Figure 12 indicates the average end-to-end delivery-latency according to the number of BANs. In case of one BAN in the field, the average end-to-end delivery-latency of the basic scheme and our beacon interval shifting scheme are 625.95 ms and 625.14 ms, respectively. This is due to no interference from other BANs. The beacon shifting scheme, on the other hand, has variable beacon intervals from 320 ms to 2,240 ms according to the beacon sequence index. Because of these variable beacon intervals, its average end-to-end delivery-latency is 800.96 ms, which is longer than the other schemes. As the increase of BANs, the interference increases, and the delivery ratio of data decreases. It causes more retransmissions and buffered data that result in a longer average end-to-end delivery-latency. Therefore, the beacon interval shifting scheme has fewer retransmissions due to packet losses. Thus, it can deliver more data than the other schemes and has a lower average end-to-end delivery-latency in Figure 12.


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

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

Average end-to-end delivery-latency according to the number of BANs.
© Copyright Policy
Related In: Results  -  Collection

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

f12-sensors-12-10930: Average end-to-end delivery-latency according to the number of BANs.
Mentions: Delivery-latency is also an important factor determining the performance of a BAN. In this paper, the end-to-end delivery-latency indicates the duration from the occurrence time of application data at a sender to the arrival time of the data at a receiver. This is different meaning from the network delivery-latency in Figure 8. Figure 12 indicates the average end-to-end delivery-latency according to the number of BANs. In case of one BAN in the field, the average end-to-end delivery-latency of the basic scheme and our beacon interval shifting scheme are 625.95 ms and 625.14 ms, respectively. This is due to no interference from other BANs. The beacon shifting scheme, on the other hand, has variable beacon intervals from 320 ms to 2,240 ms according to the beacon sequence index. Because of these variable beacon intervals, its average end-to-end delivery-latency is 800.96 ms, which is longer than the other schemes. As the increase of BANs, the interference increases, and the delivery ratio of data decreases. It causes more retransmissions and buffered data that result in a longer average end-to-end delivery-latency. Therefore, the beacon interval shifting scheme has fewer retransmissions due to packet losses. Thus, it can deliver more data than the other schemes and has a lower average end-to-end delivery-latency in Figure 12.

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