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Modeling On-Body DTN Packet Routing Delay in the Presence of Postural Disconnections.

Quwaider M, Taghizadeh M, Biswas S - EURASIP J Wirel Commun Netw (2011)

Bottom Line: Performance of the analyzed protocols are then evaluated experimentally and via simulation to compare with the results obtained from the developed model.Finally, a mechanism for evaluating the topological importance of individual on-body sensor nodes is developed.It is shown that such information can be used for selectively reducing the on-body sensor-count without substantially sacrificing the packet delivery delay.

View Article: PubMed Central - PubMed

Affiliation: Department of Computer Engineering, Jordan University of Science and Technology, Irbid, Jordan 22110-3030, Jordan.

ABSTRACT

This paper presents a stochastic modeling framework for store-and-forward packet routing in Wireless Body Area Networks (WBAN) with postural partitioning. A prototype WBANs has been constructed for experimentally characterizing and capturing on-body topology disconnections in the presence of ultrashort range radio links, unpredictable RF attenuation, and human postural mobility. Delay modeling techniques for evaluating single-copy on-body DTN routing protocols are then developed. End-to-end routing delay for a series of protocols including opportunistic, randomized, and two other mechanisms that capture multiscale topological localities in human postural movements have been evaluated. Performance of the analyzed protocols are then evaluated experimentally and via simulation to compare with the results obtained from the developed model. Finally, a mechanism for evaluating the topological importance of individual on-body sensor nodes is developed. It is shown that such information can be used for selectively reducing the on-body sensor-count without substantially sacrificing the packet delivery delay.

No MeSH data available.


Single node criticality in terms of (a) packet delay and (b) packet delay difference.
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Figure 16: Single node criticality in terms of (a) packet delay and (b) packet delay difference.

Mentions: The above mechanism is applied to the 7-node WBAN with node-3 as the source and node-6 as the destination as shown in Figure 1. Figure 16 shows the resulting end-to-end packet delay characteristics when a single node (chosen from the set 1, 2, 4, 5, or 7) is selectively removed from the network under different routing protocols. Figure 16(a) shows the new delay after a node is removed, and Figure 16(b) shows the difference between the new delay and delay obtained from the complete topology without any node removed. The latter indicates the topological criticality of the removed node from a routing standpoint. A positive low difference in Figure 16(b) would indicate that the removed node is not particularly critical for the corresponding routing protocol. Conversely, a positive high difference would indicate that the removed node is critical. A negative difference actually means that the routing performance has improved after the node is removed. This means that the corresponding routing protocol was nonoptimally choosing the node after removing which the routing protocol actually found a better route, leading to lower delay. Results for all the analyzed protocols except opportunistic routing (OPPT) are presented in Figure 16. Since OPPT relies on direct source-destination contact for packet delivery, removal of any intermediate node from the topology does not impact the delivery delay, which is why it is not included.


Modeling On-Body DTN Packet Routing Delay in the Presence of Postural Disconnections.

Quwaider M, Taghizadeh M, Biswas S - EURASIP J Wirel Commun Netw (2011)

Single node criticality in terms of (a) packet delay and (b) packet delay difference.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4269839&req=5

Figure 16: Single node criticality in terms of (a) packet delay and (b) packet delay difference.
Mentions: The above mechanism is applied to the 7-node WBAN with node-3 as the source and node-6 as the destination as shown in Figure 1. Figure 16 shows the resulting end-to-end packet delay characteristics when a single node (chosen from the set 1, 2, 4, 5, or 7) is selectively removed from the network under different routing protocols. Figure 16(a) shows the new delay after a node is removed, and Figure 16(b) shows the difference between the new delay and delay obtained from the complete topology without any node removed. The latter indicates the topological criticality of the removed node from a routing standpoint. A positive low difference in Figure 16(b) would indicate that the removed node is not particularly critical for the corresponding routing protocol. Conversely, a positive high difference would indicate that the removed node is critical. A negative difference actually means that the routing performance has improved after the node is removed. This means that the corresponding routing protocol was nonoptimally choosing the node after removing which the routing protocol actually found a better route, leading to lower delay. Results for all the analyzed protocols except opportunistic routing (OPPT) are presented in Figure 16. Since OPPT relies on direct source-destination contact for packet delivery, removal of any intermediate node from the topology does not impact the delivery delay, which is why it is not included.

Bottom Line: Performance of the analyzed protocols are then evaluated experimentally and via simulation to compare with the results obtained from the developed model.Finally, a mechanism for evaluating the topological importance of individual on-body sensor nodes is developed.It is shown that such information can be used for selectively reducing the on-body sensor-count without substantially sacrificing the packet delivery delay.

View Article: PubMed Central - PubMed

Affiliation: Department of Computer Engineering, Jordan University of Science and Technology, Irbid, Jordan 22110-3030, Jordan.

ABSTRACT

This paper presents a stochastic modeling framework for store-and-forward packet routing in Wireless Body Area Networks (WBAN) with postural partitioning. A prototype WBANs has been constructed for experimentally characterizing and capturing on-body topology disconnections in the presence of ultrashort range radio links, unpredictable RF attenuation, and human postural mobility. Delay modeling techniques for evaluating single-copy on-body DTN routing protocols are then developed. End-to-end routing delay for a series of protocols including opportunistic, randomized, and two other mechanisms that capture multiscale topological localities in human postural movements have been evaluated. Performance of the analyzed protocols are then evaluated experimentally and via simulation to compare with the results obtained from the developed model. Finally, a mechanism for evaluating the topological importance of individual on-body sensor nodes is developed. It is shown that such information can be used for selectively reducing the on-body sensor-count without substantially sacrificing the packet delivery delay.

No MeSH data available.