As an important field of emerging technology,\r\nwireless sensor networks (WSN) offer many new possibilities\r\nfor applications such as target tracking and environmental\r\nsurveillance by allowing the observer to move around\r\nfreely. However, disseminating sensing data to the mobile\r\nobserver raises significant design challenges for the routing\r\nscheme. In addition, WSN often operate under certain\r\nenergy constraints, and therefore reducing energy dissipation\r\nin order to prolong the lifetime of the WSN is another\r\nchallenge that must be faced. Most proposed routing protocols\r\nfocus on achieving effective data dissemination and\r\nenergy efficiency at the same time as working to satisfy the\r\nrequirements of the mobile observer. However, almost all of\r\nthese methods use frequent rerouting as a way of handling\r\nthe mobility issue. Such rerouting increases both overheads\r\nand energy consumption, resulting in a trade-off between\r\nthe need for rerouting to optimize network operations and\r\nthat of maximizing network lifetime. This paper presents\r\nthe Energy-aware Grid-based Routing Scheme (EAGER)\r\nfor WSN with mobile observers, which is an approach that\r\nseeks to save more energy in the context of dynamic topology.\r\nIn this paper, EAGER is compared to other proposed\r\ngrid-based schemes by using extensive simulations. These\r\nsimulations clearly show that EAGER outperforms other grid-based schemes in terms of both energy efficiency and\r\nrouting performance.
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