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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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The measured RSSIs of the interference.
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f1-sensors-12-10930: The measured RSSIs of the interference.

Mentions: In order to investigate the interference effect on the performance of BANs, we conducted an empirical test. A BAN consists of a sender node (on wrist) and a receiver node (on pocket) on the person. The attached nodes are tmote sky [12] using the Chipcon CC2420 radio chip [13]. It operates in the 2.4 GHz. In this basic condition, we have 6 test scenarios. Scenario 1: A sender node continuously transmits carrier using CC2420 transmit test mode (duty cycle = 100%) with transmit power level 3. The distance between the sender node and receiver node is 0.5 m. Scenario 2: Based on the scenario 1, the distance between the sender node and receiver node is 1 m. Scenario 3: Based on the scenario 1, we added a barrier: a person's hand between the sender node and the receiver node. Scenario 4: Based on the scenario 1, we added another BAN that continuously generates interference using CC2420 transmit test mode (duty cycle = 100%) with transmit power level 7. The distance between two BANs is 4 m (Interference 1 in Figure 1). Scenario 5: Based on scenario 4, we changed the transmit power level to 11 (Interference 2 in Figure 1). Scenario 6: Based on scenario 4, we changed the distance between two BANs to 2 m (Interference 3 in Figure 1).


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

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

The measured RSSIs of the interference.
© Copyright Policy
Related In: Results  -  Collection

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

f1-sensors-12-10930: The measured RSSIs of the interference.
Mentions: In order to investigate the interference effect on the performance of BANs, we conducted an empirical test. A BAN consists of a sender node (on wrist) and a receiver node (on pocket) on the person. The attached nodes are tmote sky [12] using the Chipcon CC2420 radio chip [13]. It operates in the 2.4 GHz. In this basic condition, we have 6 test scenarios. Scenario 1: A sender node continuously transmits carrier using CC2420 transmit test mode (duty cycle = 100%) with transmit power level 3. The distance between the sender node and receiver node is 0.5 m. Scenario 2: Based on the scenario 1, the distance between the sender node and receiver node is 1 m. Scenario 3: Based on the scenario 1, we added a barrier: a person's hand between the sender node and the receiver node. Scenario 4: Based on the scenario 1, we added another BAN that continuously generates interference using CC2420 transmit test mode (duty cycle = 100%) with transmit power level 7. The distance between two BANs is 4 m (Interference 1 in Figure 1). Scenario 5: Based on scenario 4, we changed the transmit power level to 11 (Interference 2 in Figure 1). Scenario 6: Based on scenario 4, we changed the distance between two BANs to 2 m (Interference 3 in Figure 1).

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