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Articles 1 - 6 of 6
Full-Text Articles in Physical Sciences and Mathematics
Roar: A Multi-Rate Opportunistic Aodv Routing Protocol For Wireless Ad-Hoc Networks, Kwan-Wu Chin, Darryn Lowe
Roar: A Multi-Rate Opportunistic Aodv Routing Protocol For Wireless Ad-Hoc Networks, Kwan-Wu Chin, Darryn Lowe
Associate Professor Kwan-Wu Chin
In this paper, we outline a simple approach, called ROAR, that enables the Ad-Hoc On-Demand Distance Vector (AODV) routing protocol to strengthen its routes by recruiting neighbors of nodes on the least cost path as support nodes during the route construction process, and working closely with the medium access control (MAC) to employ an opportunistic forwarding scheme that takes advantage of the node diversity at each hop. We have implemented ROAR in the ns-2 simulator over the IEEE 802.11a physical layer. From our simulation studies conducted using various network topologies and realistic radio propagation model, we find that ROAR increases …
A Novel Anti-Collision Protocol For Energy Efficient Identification And Monitoring In Rfid-Enhanced Wsns, Kwan-Wu Chin, Dheeraj Klair
A Novel Anti-Collision Protocol For Energy Efficient Identification And Monitoring In Rfid-Enhanced Wsns, Kwan-Wu Chin, Dheeraj Klair
Associate Professor Kwan-Wu Chin
This paper presents a dynamic framed slotted Aloha (DFSA) protocol that is energy efficient, and more importantly, is the first protocol capable of monitoring tags. Our protocol uses three separate frames: 1) reservation, 2) body, and 3) monitor. The reservation and body frame are used to identify tags, whereas the monitor frame is used to keep track of identified tags. We have performed extensive simulation studies on all three frames, and compared our protocol with existing framed Aloha protocols. From our results, we confirm that our protocol is suitable for use in RFID-enhanced Wireless Sensor Networks (WSNs).
Coordination In Wireless Sensor-Actuator Networks: A Survey, Hamidreza Salarian, Kwan-Wu Chin, Fazel Naghdy
Coordination In Wireless Sensor-Actuator Networks: A Survey, Hamidreza Salarian, Kwan-Wu Chin, Fazel Naghdy
Associate Professor Kwan-Wu Chin
"Wireless Sensor-Actuator Networks (WSANs) have a myriad of applications, ranging from pacifying bulls to controlling light intensity in homes automatically. An important aspect of WSANs is coordination. Unlike conventional Wireless Sensor Networks (WSNs), sensor and actuator nodes must work hand-in-hand to collect and forward data, and act on any sensed data collaboratively, promptly and reliably. To this end, this paper reviews current state-of-the-art techniques that address this fundamental problem: More specifically, we review techniques in the following areas: (i) sensor-actuator coordination, (ii) routing protocols, (iii) transport protocols, and (iv) actuator-to-actuator coordination protocols. We provide an extensive qualitative comparison of their …
Novel Association Control Strategies For Multicasting In Relay-Enabled Wlans, Kwan-Wu Chin, Shinan Li
Novel Association Control Strategies For Multicasting In Relay-Enabled Wlans, Kwan-Wu Chin, Shinan Li
Associate Professor Kwan-Wu Chin
Multicast is a fundamental communication service in Wireless Local Area Networks (WLANs). Unfortunately, multicast packets are transmitted at the base rate needlessly, which prevents rich multimedia contents from being delivered to users. To this end, a number of prior studies have proposed to increase multicast capacity whereby an Access Point (AP) transmits at the highest data rate that can be decoded by all subscribers. Another approach is by controlling subscriber-AP associations such that a given objective, e.g., AP load, is met. Moreover, they have also proposed using relays to help boost stations with weak channel condition. In this paper, we …
Aloha-Based Protocols, Kwan-Wu Chin, Dheeraj Klair
Aloha-Based Protocols, Kwan-Wu Chin, Dheeraj Klair
Associate Professor Kwan-Wu Chin
In RFID systems, the primary aim of the reader is to identify tags quickly. Hence, anti-collision protocols play an important role in arbitrating tag replies such that a reader experiences minimal or no collisions in each read round. Moreover, they must minimize idle slots to ensure high system efficiency. Otherwise, a RFID reader will experience prolonged identification delays, and also energy and bandwidth wastage. Henceforth, this chapter presents a comprehensive review of Aloha based anti-collision protocols. Specifically, we will present Pure Aloha (PA), Slotted Aloha (SA), Framed Slotted Aloha (FSA), and theirvariants. In addition, we will analyze their read performance …
Minimesh: An Opportunistic Transmission Protocol For The Ieee 802.15.3 Mac , Kwan-Wu Chin, Darryn Lowe
Minimesh: An Opportunistic Transmission Protocol For The Ieee 802.15.3 Mac , Kwan-Wu Chin, Darryn Lowe
Associate Professor Kwan-Wu Chin
This paper proposes MiniMesh, an opportunistic transmission mechanism for theIEEE 802.15.3 medium access control (MAC) protocol; a key technology torealizing wireless personal area networks (WPANs). MiniMesh exploits thevarying channel conditions to devices in a WPAN, thereby enabling the senderand receiver of a flow to transmit at high data rates when the channelcondition is favorable. In addition, MiniMesh addresses the coverage problemthat limits peer-to-peer communications and is backward compatible with theIEEE 802.15.3 specification. We have implemented MiniMesh and the DS-UWBphysical layer that offers data rates ranging from 28 Mbps to 1 Gbps in the{\it ns-2} simulator. Our results show devices obtain …