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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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f9-sensors-12-10930: Delivery ratio of beacons according to the number of BANs.

Mentions: A beacon contains limited information (e.g., beacon interval, time slot scheduling information, timestamp). The beacon is an important packet as it schedules time slots for each node. If a node fails to receive the beacon, it cannot transmit and receive until the next beacon interval. This influences the delivery ratio, and is thus closely related to energy consumption and delivery-latency. Figure 9 shows the delivery ratio of beacons according to the number of BANs. By increasing the number of BANs, the basic scheme indicates a lower delivery ratio of beacons due to high interference in the channel. If the beacon shifting scheme is used, each BAN transmits beacons according to its unique beacon sequence index. Thus, IEEE 802.15.6 expects to avoid repeated beacon collisions with its neighbor BANs. Figure 9, however, shows similar results to the basic scheme. Since there is no central coordinator among BANs, interference and collision still occur randomly even if each BAN uses the unique beacon sequence index. Our beacon interval shifting scheme displays almost a 100% beacon delivery ratio. Carrier sensing before beacon transmission enables this scheme to identify the channel state, and, thus, each BAN can avoid beacon collisions with other BANs.


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

f9-sensors-12-10930: Delivery ratio of beacons according to the number of BANs.
Mentions: A beacon contains limited information (e.g., beacon interval, time slot scheduling information, timestamp). The beacon is an important packet as it schedules time slots for each node. If a node fails to receive the beacon, it cannot transmit and receive until the next beacon interval. This influences the delivery ratio, and is thus closely related to energy consumption and delivery-latency. Figure 9 shows the delivery ratio of beacons according to the number of BANs. By increasing the number of BANs, the basic scheme indicates a lower delivery ratio of beacons due to high interference in the channel. If the beacon shifting scheme is used, each BAN transmits beacons according to its unique beacon sequence index. Thus, IEEE 802.15.6 expects to avoid repeated beacon collisions with its neighbor BANs. Figure 9, however, shows similar results to the basic scheme. Since there is no central coordinator among BANs, interference and collision still occur randomly even if each BAN uses the unique beacon sequence index. Our beacon interval shifting scheme displays almost a 100% beacon delivery ratio. Carrier sensing before beacon transmission enables this scheme to identify the channel state, and, thus, each BAN can avoid beacon collisions with other BANs.

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