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Location based services are the hottest applications on mobile device nowadays. Indoor wireless position is the key technology to enable location based service to work well indoors, where Global Position System normally couldn't work. The main tendency of indoor wireless position is based on Bluetooth and RSSI (radio signal strength indicator). RSSI is the key parameter for wireless position. But...
Cooperative content offloading is a promising technology to lessen heavy burden of wireless networks and improve the quality of downloading services. Since few users are voluntary in providing free assistance, auction-based incentive mechanisms are designed to encourage participation. In existing auction-based incentive mechanisms, each provider only acts as a service seller. However, a provider could...
This paper describes the development of RFID background and the advantages and disadvantages of the Cigarette pallet, the radio frequency identification technology has been fully described in the cigarette pallet management system and research. Has analyzed the questions of the RFID cigarette pallet which exist in the warehousing management process and proposed solutions. Combining with bar code technology,used...
A wireless FAEM (facility agriculture environmental monitoring) system is presented by using ZigBee and GPRS technology, and the hardware realization and software flow are given too. By means of ZigBee wireless sensor module, the method can get together much information on soil humidity, Carbon dioxide, temperature, humidity and so on. Then such information is delivered to the remote control center...
Experiments show that FMIPv6 may suffer long handover latency even in the predictive mode in the real IEEE 802.11 based WLANs. To figure out the latency reason and identify potential enhancement of FMIPv6, we analyze the handover latency of the predictive FMIPv6 from a cross layer perspective using data collected in a real IEEE 802.11 test-bed. We find that the key issues affecting the handover latency...
TCP is primarily designed for wired networks and became very efficient and robust with years of enhancements. However, experiments and research showed that TCPpsilas congestion control algorithm performs very poorly over Wireless Sensor Networks with degraded throughputs. This paper studies TCPpsilas throughput issues in Wireless Sensor Networks, and designs an improved congestion control algorithm...
Transmission control protocol (TCP) is a reliable, end-to-end transport protocol, which is widely used for data services and is very efficient for wired networks. However, experiments and research showed that TCP's congestion control algorithm performs very poorly over wireless sensor networks with degraded throughputs. This paper studies TCP's throughput issues in wireless sensor networks, and designs...
Localization in wireless sensor networks has become a significant research challenge, attracting many researchers in the past decade. This paper provides a review of basic techniques and the state-of-the-art approaches for wireless sensors localization. The challenges and future research opportunities are discussed in relation to the design of the collaborative workspaces based on cooperative wireless...
Multihoming feature enables stream control transmission protocol (SCTP) to be a handover and mobility scheme for mobile users in multihomed environment. However, there are two flaws deteriorating SCTP handover performance. First, the congestion control mechanism of SCTP makes entire association experience a slow-start phase after handover, thus leading to a sudden-shrink of throughput. Second, the...
In heterogeneous wireless networks, handoff can be separated into two parts: horizontal handoff (HHO) and vertical handoff (VHO). VHO plays an important role to fulfill seamless data transfer when mobile nodes cross wireless access networks with different link layer technologies. Current VHO algorithms mainly focus on when to trigger VHO, but neglect the problem of how to synthetically consider all...
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