Relay Node Deployment Strategies in Heterogeneous Wireless Sensor Networks
In a heterogeneous wireless sensor network (WSN), relay nodes (RNs) are adopted to relay data packets from sensor nodes (SNs) to the base station (BS). The deployment of the RNs can have a significant impact on connectivity and lifetime of a WSN system. ...
Handling Mobility in Wireless Sensor and Actor Networks
In Wireless Sensor and Actor Networks (WSANs), the collaborative operation of sensors enables the distributed sensing of a physical phenomenon, while actors collect and process sensor data and perform appropriate actions. WSANs can be thought of as a ...
Multiple RFID Tags Access Algorithm
One of the main problems that affect the data integrity of passive RFID systems is the collision between the tags. A popular anticollision algorithm which dominates the standards in HF and UHF passive RFID systems is Framed Slotted Aloha (FSA) and some ...
Handoff Performance in Wireless Mobile Networks with Unreliable Fading Channel
Handoff is an indispensable operation in wireless networks to guarantee continuous, effective, and resilient services during a Mobile Station (MS) mobility. Handoff counting, handoff rate, and handoff probability are important metrics to characterize ...
A Multichannel Scheduler for High-Speed Wireless Backhaul Links with Packet Concatenation
Capacity has been an important issue for many wireless backhaul networks. Both the multihop nature and the large per packet channel access overhead can lead to its low channel efficiency. The problem may get even worse when there are many applications ...
Cost Analysis of Short Message Retransmissions
Short Message Service (SMS) is the most popular mobile data service today. In Taiwan, a subscriber sends more than 200 short messages per year on average. The huge demand for SMS significantly increases network traffic, and it is essential that mobile ...
MAC for Networks with Multipacket Reception Capability and Spatially Distributed Nodes
The physical layer of future wireless networks will be based on novel radio technologies such as UWB and MIMO. One of the important capabilities of such technologies is the ability to capture a few packets simultaneously. This capability has the ...
Quantifying Impact of Mobility on Data Availability in Mobile Ad Hoc Networks
In mobile ad hoc networks, there are many applications in which mobile users share information, e.g., collaborative rescue operations at a disaster site and exchange of word-of-mouth information in a shopping mall. For such applications, improving data ...
Optimal Relay Station Placement in Broadband Wireless Access Networks
To satisfy the stringent requirement of capacity enhancement in wireless networks, cooperative relaying is envisioned as one of the most effective solutions. In this paper, we study the capacity enhancement problem by way of Relay Stations (RSs) ...
Asymptotic Distortion Performance of Source-Channel Diversity over Multihop and Relay Channels
A key challenge in the design of real-time wireless multimedia systems is the presence of fading coupled with strict delay constraints. A very effective answer to this problem is the use of diversity achieving techniques to overcome the fading nature of ...
Superdiffusive Behavior of Mobile Nodes and Its Impact on Routing Protocol Performance
Mobility is the most important component in mobile ad hoc networks (MANETs) and delay-tolerant networks (DTNs). In this paper, we first investigate numerous GPS mobility traces of human mobile nodes and observe superdiffusive behavior in all GPS traces, ...
