The Experts below are selected from a list of 16851 Experts worldwide ranked by ideXlab platform
Kin K Leung - One of the best experts on this subject based on the ideXlab platform.
-
cross layer Routing using cooperative transmission in vehicular ad hoc networks
IEEE Journal on Selected Areas in Communications, 2011Co-Authors: Zhiguo Ding, Kin K LeungAbstract:Wireless vehicular ad hoc networks are characterized by multi-hop transmission, where a key problem is the design of Routing, e.g., how to efficiently direct the information flow from the source to the destination via available intermediate nodes. In this paper, cross-layer Routing is studied by applying cooperative transmission and a new strategy of path selection is proposed to achieve a better tradeoff between the transmission power consumption and end-to-end reliability. The influence of cooperative transmission to the wireless link cost is first studied, which shows that the quality of wireless links could be improved significantly. Then we focus on formulating the objective functions for the addressed cross-layer optimization problem. Specifically, according to different quality of service requirements, two different types of Routing optimization are investigated to understand the effects of improved link cost to the Routing Decision. The closed-form expressions of the optimal solutions for two addressed optimization problems are developed and later used as quantitative criteria of the Routing Decision. Our developed analytical and simulation results show that the criteria using cooperative transmission typically yield more efficient routes than the comparable schemes in terms of end-to-end reliability and total transmission power.
Zhi Wang - One of the best experts on this subject based on the ideXlab platform.
-
enhancing real time delivery in wireless sensor networks with two hop information
IEEE Transactions on Industrial Informatics, 2009Co-Authors: Yanjun Li, Chung Shue Chen, Ye-qiong Song, Zhi WangAbstract:A two-hop neighborhood information-based Routing protocol is proposed for real-time wireless sensor networks. The approach of mapping packet deadline to a velocity is adopted as that in SPEED; however, our Routing Decision is made based on the novel two-hop velocity integrated with energy balancing mechanism. Initiative drop control is embedded to enhance energy utilization efficiency, while reducing packet deadline miss ratio. Simulation and comparison show that the new protocol has led to lower packet deadline miss ratio and higher energy efficiency than two existing popular schemes. The result has also indicated a promising direction in supporting real-time quality-of-service for wireless sensor networks.
-
A two-hop based real-time Routing protocal for wireless sensor networks
2008Co-Authors: Chung Shue Chen, Ye-qiong Song, Zhi Wang, Youxian SunAbstract:A two-hop neighborhood information based Routing protocol is proposed for real-time wireless sensor networks. The approach of mapping packet deadline to a velocity is adopted as SPEED; however, our Routing Decision is made based on the novel 2-hop velocity. Energyefficient probabilistic drop is embedded to enhance energy utilization efficiency while reducing packet deadline miss ratio. In case packet deadline requirement is not stringent, a new mechanism is included to release nodes which are frequently chosen as forwarders. Improvement on energy consumption balance throughout the network is observed. The true characteristics of physical and MAC layers are captured in the simulation. A real lossy link model is drawn from extensive experiments through Mica2 Motes. Simulation results show that the new protocol has achieved lower packet deadline miss ratio and higher energy efficiency.
Zhiguo Ding - One of the best experts on this subject based on the ideXlab platform.
-
cross layer Routing using cooperative transmission in vehicular ad hoc networks
IEEE Journal on Selected Areas in Communications, 2011Co-Authors: Zhiguo Ding, Kin K LeungAbstract:Wireless vehicular ad hoc networks are characterized by multi-hop transmission, where a key problem is the design of Routing, e.g., how to efficiently direct the information flow from the source to the destination via available intermediate nodes. In this paper, cross-layer Routing is studied by applying cooperative transmission and a new strategy of path selection is proposed to achieve a better tradeoff between the transmission power consumption and end-to-end reliability. The influence of cooperative transmission to the wireless link cost is first studied, which shows that the quality of wireless links could be improved significantly. Then we focus on formulating the objective functions for the addressed cross-layer optimization problem. Specifically, according to different quality of service requirements, two different types of Routing optimization are investigated to understand the effects of improved link cost to the Routing Decision. The closed-form expressions of the optimal solutions for two addressed optimization problems are developed and later used as quantitative criteria of the Routing Decision. Our developed analytical and simulation results show that the criteria using cooperative transmission typically yield more efficient routes than the comparable schemes in terms of end-to-end reliability and total transmission power.
Christos A Kontovas - One of the best experts on this subject based on the ideXlab platform.
-
ship speed optimization concepts models and combined speed Routing scenarios
Transportation Research Part C-emerging Technologies, 2014Co-Authors: Harilaos N Psaraftis, Christos A KontovasAbstract:The purpose of this paper is to clarify some important issues as regards ship speed optimization at the operational level and develop models that optimize ship speed for a spectrum of Routing scenarios in a single ship setting. The paper’s main contribution is the incorporation of those fundamental parameters and other considerations that weigh heavily in a ship owner’s or charterer’s speed Decision and in his Routing Decision, wherever relevant. Various examples are given so as to illustrate the properties of the optimal solution and the various trade-offs that are involved.
Ye-qiong Song - One of the best experts on this subject based on the ideXlab platform.
-
enhancing real time delivery in wireless sensor networks with two hop information
IEEE Transactions on Industrial Informatics, 2009Co-Authors: Yanjun Li, Chung Shue Chen, Ye-qiong Song, Zhi WangAbstract:A two-hop neighborhood information-based Routing protocol is proposed for real-time wireless sensor networks. The approach of mapping packet deadline to a velocity is adopted as that in SPEED; however, our Routing Decision is made based on the novel two-hop velocity integrated with energy balancing mechanism. Initiative drop control is embedded to enhance energy utilization efficiency, while reducing packet deadline miss ratio. Simulation and comparison show that the new protocol has led to lower packet deadline miss ratio and higher energy efficiency than two existing popular schemes. The result has also indicated a promising direction in supporting real-time quality-of-service for wireless sensor networks.
-
A two-hop based real-time Routing protocal for wireless sensor networks
2008Co-Authors: Chung Shue Chen, Ye-qiong Song, Zhi Wang, Youxian SunAbstract:A two-hop neighborhood information based Routing protocol is proposed for real-time wireless sensor networks. The approach of mapping packet deadline to a velocity is adopted as SPEED; however, our Routing Decision is made based on the novel 2-hop velocity. Energyefficient probabilistic drop is embedded to enhance energy utilization efficiency while reducing packet deadline miss ratio. In case packet deadline requirement is not stringent, a new mechanism is included to release nodes which are frequently chosen as forwarders. Improvement on energy consumption balance throughout the network is observed. The true characteristics of physical and MAC layers are captured in the simulation. A real lossy link model is drawn from extensive experiments through Mica2 Motes. Simulation results show that the new protocol has achieved lower packet deadline miss ratio and higher energy efficiency.
-
Real-Time Routing Protocols for Wireless Sensor Networks
2008Co-Authors: Chung Shue Chen, Ye-qiong SongAbstract:Developing real-time Routing protocols under energy constraint is one of the key points for providing end-to-end delay guarantee in multi-hop wireless sensor networks. In this paper, we give, at first, an overview of the existing real-time Routing protocols and point out some potential approaches to improve them. To enhance existing protocols, one way is to make Routing Decision based on multi-hop rather than 1-hop neighborhood information. We study the asymptotic performance of a generic Routing metric as the quantity of information a priori increases and propose then a 2-hop neighborhood information based real-time Routing protocol. As an example, the approach of mapping packet deadline to a velocity is adopted as in SPEED; however, our Routing Decision is made based on the 2-hop velocity. An energy efficient probabilistic drop is proposed to improve energy utilization efficiency. When packet deadline requirement is not stringent, a design is integrated to release nodes from heavy consumption. Energy balance over nodes is thus improved. Simulation results show that, compared with protocol SPEED that only utilizes 1-hop information, the proposed scheme leads to lower deadline miss ratio and higher energy efficiency.
