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In this work, we mainly consider the synchronization problem of hybrid transmit-only nodes for slight modified IEEE 802.15.4 wireless sensor networks, which is called TRO 802.15.4. However, we should let the IEEE 802.15.4 networks to fit transmission cycle of transmit-only nodes in order to achieve the synchronization. The adaptive beacon interval shifting and resizing (ABISR) algorithm is then proposed...
The IEEE 802.15.4 standard for the Low Rate Wireless Personal Area Networks (LR-WPANs)is popular and widely used for many areas of applications. The standard uses slotted CSMA/CA protocol in it's contention access period (CAP) in the beacon enabled mode. The protocol adopted a Binary Exponential Backoff (BEB)algorithm. In this paper, we investigate the saturation throughput of this standard using...
The Low Rate Wireless Personal Area network (LR-WPAN), that is IEEE 802.15.4 is extensively used for many areas of applications. The Slotted CSMA/CA mechanism is used by the standard in its contention access period (CAP) in beacon enabled mode. The protocol supported a binary exponential backoff (BEB) algorithm. In this paper, we investigate the saturation throughput, mean frame service time or delay...
Wireless Body Area Network (WBAN) is a special purpose sensor application network which can be applied for applications relating to the health care. WBAN should support immediate and reliable data transmission for medical service during an emergency situation. Hence this paper proposes a new MAC superframe structure which can handle emergency data as well as a regular periodic data at the time of...
This paper evaluates an analytic method for throughput measurement of IEEE 802.15.4 WSN networks under the interference of an IEEE 802.11 WLAN network with help of mathematical calculations. The presence of mutual interference between IEEE 802.15.4 and IEEE 802.11 makes the packet to be lost due to collision in data packets. In this paper, the transmission phenomenon is evaluated by five different...
A significant number of previous studies have shown, however, network traffic exhibited frequently large bursty traffic possesses self-similar properties. For the future applications of wireless sensor networks (WSNs) with large number of cluster structures, such as Internet of Things (IoT) and smart grid, the network traffic should not be assumed as conventional Poisson process. We thus employ ON/OFF...
To meet the requirements on data collection from wireless sensor network for healthcare application especially in hospital, the performance of wireless communication is an important issue. In particular, simultaneous transmissions from numerous sensors will cause serious collision which leads to transmission packets loss and delay. In this paper, a management scheme, multi-criteria decision making...
Wireless Sensor Network (WSN) is a promising technology for many applications, such as industrial, environment, and health-care application. The first requirement of WSN is energy efficiency in order to increase the network node lifetime. The second is reliability because packet drop cannot be tolerated in critical time applications. In this paper, we use NS2 simulation to evaluate and analyze the...
IEEE 802.15.4 standard is designed for low power wireless personal area networks (LR-WPANs). Recently, both industry and academia are attracted to IEEE 802.15.4 because of its applicability in wireless sensor networks (WSNs) and wireless body area sensor networks (WBANs). An important feature of IEEE 802.15.4 is the very low duty cycle operation to conserve sensor node's energy. In this paper, we...
Wireless sensor networks (WSN) are used in many fields such as industrial control, building automation, environmental monitoring, etc. IEEE 802.15.4 standard defines the features of MAC layer and physical layer for WSN. Many analytical models studied the performance of the multihop IEEE 802.15.4 networks under the assumption of ideal wireless channel, and they did not consider the effect of imperfect...
Today in the era of wireless technology, everything seems to be possible. One of the wireless techniques that made the things easier is Zig-Bee technology. Zig-Bee is a wireless personal area network (WPAN) based on IEEE 802.15.4 standard to provide communication in short distance with low data rate in low cost. Zig-Bee 802.15.4 WPANs are made up of end devices, routers and a co-ordinator by using...
Wireless Sensor Networks (WSNs) have been proposed for various monitoring applications including environmental, industrial, military and health care. The use of WSNs with cluster-tree topologies for such applications solves the limited coverage issue of the wireless sensor devices and allows them to be deployed in wider area. WSNs with cluster-tree topologies suffer from various problems including...
Energy efficient protocol design for Wireless Sensor Networks (WSNs) is a very challenging task because of limited battery capacity of nodes. This necessity for energy efficient operation of a WSN has prompted the development of new protocols in all layers of the communication stack. Layer-wise utilization of densely deployed nodes to effectively prolong the overall network life is presented in this...
In this paper, theoretical analysis of network throughput of IEEE 802.15.4 enabled wireless sensor networks under WLAN interference shall be introduced. Analysis of achievable network throughputs is presented under multiple network configurations and WLAN interference scenarios.
Recent advances in wireless communications have a strong impact on the development of wireless sensor networks(WSNs). The development of wireless sensor networks can be originally promoted by military applications such as battlefield surveillance and now used in many civilian application areas. The IEEE 802.15.4 protocol is a rising standard for WSN applications because it pays particular attention...
Wireless Sensor Networks (WSNs) have emerged as a new class of large scale networks of embedded systems with limited communication, computation and energy resources. Recently IEEE 802.15.4 standards are accepted as Low-Rate Wireless Personal Area Network (LR-WPAN) which are most extensively used communication platform for WSNs. Traditional routing in IEEE 802.15.4 networks is based on Ad hoc On-demand...
In IEEE 802.15.4 beacon-enabled mode, the personal area network (PAN) coordinator can assign guaranteed time slot (GTS) to allocate a particular duration for requested devices. The main challenge in GTS mechanism is how the PAN coordinator allocates time slot duration for the devices which request GTS. However, if the allocated devices use GTS slot partially or the traffic pattern is not suitable,...
IEEE 802.15.4 that is standard for Wireless Sensor Network (WSN) has been becoming prominent due to its wide variety of real time applications such as medical care, vehicle traffic control, embedded, etc. But for proper working of these sensor networks, certain performance parameters should be taken into consideration. We are analyzing three parameters namely-throughput, loss rate and average delay...
Inter-user interference degrades the reliability of data delivery in Wireless Body Sensor Networks (WBSNs) in dense deployments when multiple users wearing WBSNs are in close proximity to one another. The impact of such interference in realistic WBSN systems is significant but has not been well explored. To this end, we investigate and analyze the impact of inter-user interference in practical WBSN...
IEEE 802.15.4 defines a popular MAC standard for wireless sensor and actuator networks. With the default parameters, under medium to high load, 802.15.4 generates excessive collisions and packet losses. Low duty cycles even exacerbate the problem, because more nodes become active after long periods of sleep and contend for channel access. In this paper, we have applied the models that led to the Idle...
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