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Tang X.,Wuhan University | Tang X.,City University of Hong Kong | Wang J.,Wuhan Fiberhome Networks Co. | Wang J.,Wuhan Research Institute of Post and Telecommunications | And 4 more authors.
Advances in Information Sciences and Service Sciences | Year: 2012

Most existing routing protocols for CR ad hoc networks attempt to build a stable and reliable route for data transmission. However, establishing such a route for a whole flow is usually not possible due to the instability and unpredictability of channel conditions in CR environment. In this paper, we discuss a geographic based opportunistic routing protocol for CR ad hoc networks. The problem of our concern is: given a set of CR nodes with geographical positions and temporarily available channels, how to design a protocol so that the average number of transmissions per packet is minimized. We propose a novel routing protocol where packets are transmitted through successively geographic closer intermediate destination nodes, until eventually destination is reached. The intermediate destination nodes are within a two-hop neighborhood and locally chosen by a heuristic algorithm we develop. We also propose an algorithm for selecting the operating channel for opportunistic routing. Extensive simulations are conducted to show the performance of our protocol. Source


Zhang Y.,Wuhan Textile University | Hao F.,Wuhan University | Li J.,Wuhan Textile University | Wang J.,Wuhan Textile University | And 4 more authors.
2015 12th International Computer Conference on Wavelet Active Media Technology and Information Processing, ICCWAMTIP 2015 | Year: 2015

With network coding, data flows from the source to the destinations may be jointly coded in some intermediate nodes to achieve the maximum network capacity. There is scarcely any theory to systematically model and evaluate the loss of network coding. Without such a theory, the analysis of network coding under various settings is far from practical. To fill the vacancy, we introduce a loss model into network coding through the theory of stochastic network calculus. In order to obtain an ideal loss model, we deduce the loss probability under two bounds, respectively maximum coding opportunity and minimum coding opportunity. © 2015 IEEE. Source


Zhu W.,Wuhan Research Institute of Post and Telecommunications
2nd International Conference on Future Networks, ICFN 2010 | Year: 2010

This paper first presents a brief overview of the PBB and the H-VPLS technologies, along with the shortcomings of existing H-VPLS, and then designs the solutions by deploying PBB interoperating with H-VPLS over networks with a MPLS core, which improve the standard H-VPLS. © 2010 IEEE. Source


Li W.,Hubei University | Li W.,Wuhan Research Institute of Post and Telecommunications | Xu Z.-Q.,Hubei Engineering University | Yang Z.,Wuhan Research Institute of Post and Telecommunications
Communications in Computer and Information Science | Year: 2012

Peer participation in P2P systems is inherently dynamic and must be taken into account in both the design and evaluation of any large scale DHT network. P2P network needs to deal with the current churn to provide high availability and quality of service especially, for example, in the mobile environments. Previous study can not provide a method to obtain the churn status in real-time. Thus they can not propose a valuable reference to resolve current churn problems. In this paper, we transfer the information of Churn status into the lookup delay time by lookup delay model. Thus we can measure the churn status of the network by lookups of the network. A general method to get lookup information was provided. At last, we evaluate the factors which will affect the efficiency of the measurement by simulations. © 2012 Springer-Verlag Berlin Heidelberg. Source


Qi N.,Oregon State University | Li X.,CAS Institute of Semiconductors | Li H.,Oregon State University | Xiao X.,Wuhan Research Institute of Post and Telecommunications | And 7 more authors.
Conference on Optical Fiber Communication, Technical Digest Series | Year: 2015

A 25Gb/s heterogeneously-integrated Silicon-Photonic transmitter is designed entirely in CMOS, consisting of a high-swing driver wire-bonded to a MZ modulator. Measurement results demonstrate clean optical eye diagrams with > 4dB extinction ratio while consuming 0.52W. © 2015 OSA. Source

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