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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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f10-sensors-12-10930: Delivery ratio of data according to the number of BANs.

Mentions: A node cannot use the channel until it successfully receives a beacon. Therefore, the delivery ratio of data is closely related to the delivery ratio of beacons. Figure 10 shows that, as the number of BANs increases, the delivery ratio of data decreases. In the basic scheme and the beacon shifting scheme, the main reason for this decrease is packet loss due to active time overlaps among BANs. Moreover, in cases of beacon reception failure and packet losses, the retransmission of data increases. These retransmissions lead to a higher probability of buffer overflow, resulting in packet drops. In contrast, the beacon interval shifting scheme hardly has any packet losses as it guarantees an idle channel by performing carrier sensing before beacon transmission. Nevertheless, the delivery ratio of data declines as the number of BANs increases. A BAN with many neighbor BANs has a higher probability of encountering a busy channel, and extends its back-off time to occupy the channel. The extended back-off time causes frequent buffer overflows, resulting in many packet drops. As shown in Figure 10, the delivery ratio of data gradually decreases in the beacon interval shifting scheme. It does, however, show an approximately 35% higher delivery ratio than the other schemes because it has lower packet loss.


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

f10-sensors-12-10930: Delivery ratio of data according to the number of BANs.
Mentions: A node cannot use the channel until it successfully receives a beacon. Therefore, the delivery ratio of data is closely related to the delivery ratio of beacons. Figure 10 shows that, as the number of BANs increases, the delivery ratio of data decreases. In the basic scheme and the beacon shifting scheme, the main reason for this decrease is packet loss due to active time overlaps among BANs. Moreover, in cases of beacon reception failure and packet losses, the retransmission of data increases. These retransmissions lead to a higher probability of buffer overflow, resulting in packet drops. In contrast, the beacon interval shifting scheme hardly has any packet losses as it guarantees an idle channel by performing carrier sensing before beacon transmission. Nevertheless, the delivery ratio of data declines as the number of BANs increases. A BAN with many neighbor BANs has a higher probability of encountering a busy channel, and extends its back-off time to occupy the channel. The extended back-off time causes frequent buffer overflows, resulting in many packet drops. As shown in Figure 10, the delivery ratio of data gradually decreases in the beacon interval shifting scheme. It does, however, show an approximately 35% higher delivery ratio than the other schemes because it has lower packet loss.

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