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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 beacons according to the number of BANs.
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f13-sensors-12-10930: Delivery ratio of beacons according to the number of BANs.

Mentions: Figure 13 illustrates the delivery ratio of beacons depending on the number of BANs. As for the stationary case, the delivery ratio of beacons decreases as more BANs exist in the field. However, because of its local mobility within the BAN, even when one BAN exists in the field a few beacons are missed, resulting in about a 99% beacon delivery ratio. In the basic scheme and the beacon shifting scheme, the delivery ratio of beacons gradually decrease. It is marginal improvement compared with the stationary case because the interference effect is too low. However, the beacon is a very important packet. If a beacon fails to be delivered, the BAN cannot deliver data during the entire superframe since the time slots are not scheduled. Thus, the delivery ratio of data is highly dependent on the delivery ratio of beacon. The channel state obtained by carrier sensing is not perfectly accurate because the mobility of BANs continuously changes the channel state. For this reason, the delivery ratio of beacons decreases slightly in the beacon interval shifting scheme.


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

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

f13-sensors-12-10930: Delivery ratio of beacons according to the number of BANs.
Mentions: Figure 13 illustrates the delivery ratio of beacons depending on the number of BANs. As for the stationary case, the delivery ratio of beacons decreases as more BANs exist in the field. However, because of its local mobility within the BAN, even when one BAN exists in the field a few beacons are missed, resulting in about a 99% beacon delivery ratio. In the basic scheme and the beacon shifting scheme, the delivery ratio of beacons gradually decrease. It is marginal improvement compared with the stationary case because the interference effect is too low. However, the beacon is a very important packet. If a beacon fails to be delivered, the BAN cannot deliver data during the entire superframe since the time slots are not scheduled. Thus, the delivery ratio of data is highly dependent on the delivery ratio of beacon. The channel state obtained by carrier sensing is not perfectly accurate because the mobility of BANs continuously changes the channel state. For this reason, the delivery ratio of beacons decreases slightly in the beacon interval shifting scheme.

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