Abstract
Software defined networks brings greater flexibility to networks and therefore generates new vitality. Thanks to the ability to update soft code to sensor nodes, wireless sensor networks (WSNs) brings profound changes to Internet of Things. However, it is a challenging issue to minimize delay and transmission times and maintain long lifetime when broadcasting data packets in high loss ratio and low duty cycle WSNs. Although there have been some research concerning code dissemination, those schemes can only achieve a tradeoff between different performances, instead of optimizing all these important performances at the same time. Therefore, in this paper we propose a new strategy that can reduce delay and transmission times simultaneously. In traditional method, the broadcasting nature of wireless communication is not sufficiently utilized. By allowing sons of the same parent node to share awake slots, the broadcasting nature is well exploited and delay is thus reduced as well as transmission times with lifetime not affected. And, as we discover there is energy surplus when collecting data in area away from sink, we further improve this strategy so that all the performances can be further bettered. Compared with traditional method, the methods we design (IFAS, BTAS and AAPS) can respectively reduce delay by 20.56%, 31.59%, 55.16% and reduce transmission times by 29.53%, 43.93%, 42.04%, while not reducing lifetime.
Highlights
Wireless sensor networks (WSNs), consisting of tiny wireless sensing devices equipped with data processing and communication capabilities, is an important element for realizing the Internet of Things (IoT) [1,2,3,4,5]
While If Fail Add Slot (IFAS) allows packets that need resending to be received within a cycle without increasing the number of deliveries, which is beneficial to the son nodes with small slot serial number, because it can add awake slots when the reception fails, reducing the delay and transmission times without increasing the energy consumption, it is not very efficient to the node with the largest slot serial number
Assuming there are son in order to completely cover the The slots cycle,individually, inofthe worst all the node should have one redundant slot added, theyall should addin a slots when minimum transmission delay is achieved is shown in Average Place Slot (AAPS), the slots are added scenario described above, since there are slots, all the nodes have to add a total of − 1 slots, that minimum transmission delay canitbe reached at most cases. nodes’ slots, the expectation of andsowhen node since can make brother slots per starts node.receiving
Summary
Wireless sensor networks (WSNs), consisting of tiny wireless sensing devices equipped with data processing and communication capabilities, is an important element for realizing the Internet of Things (IoT) [1,2,3,4,5]. While IFAS allows packets that need resending to be received within a cycle without increasing the number of deliveries, which is beneficial to the son nodes with small slot serial number, because it can add awake slots when the reception fails, reducing the delay and transmission times without increasing the energy consumption, it is not very efficient to the node with the largest slot serial number. Because this son node is the last node to receive data from its parent node.
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