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Statistics for Spatial Data.

"A Survey of Mobility Models for Ad Hoc Network Research," Wireless Comm. & Mobile Computing (WCMC) : Special issue on Mobile Ad Hoc Networking : Research

In the performance evaluation of a protocol for an ad hoc network, the protocol should be tested under realistic conditions including, but not limited to, a sensible transmission range, limited buffer space for the storage of messages, representative data traffic models, and realistic movements of the mobile users (i.e., a mobility model). This paper is a survey of mobility models that are used in the simulations of ad hoc networks. We describe several mobility models that represent mobile nodes whose movements are independent of each other (i.e., entity mobility models) and several mobility models that represent mobile nodes whose movements are dependent on each other (i.e., group mobility models). The goal of this paper is to present a number of mobility models in order to offer researchers more informed choices when they are deciding upon a mobility model to use in their performance evaluations. Lastly, we present simulation results that illustrate the importance of choosing a mobility model in the simulation of an ad hoc network protocol. Specifically, we illustrate how the performance results of an ad hoc network protocol drastically change as a result of changing the mobility model simulated.

/pdf/a-survey-of-mobility-models-for-ad-hoc-network-research-ygkxat400x.pdf

A survey of mobility models for ad hoc network research

http://www.csun.edu/~andrzej/COMP529-S05/papers/Mesh%20Networks%20Survey.pdf

Wireless mesh networks: a survey

Network virtualization enables diversified network architectures to coexist in a substrate network. Content-centric network (CCN), as one of the major proposals for the future network, can be deployed in the virtualized environment. However, the recent work that has attempted in this direction has not addressed issues concerning the unique resource usage of CCN in resource allocations during the embedding procedure when instantiating a virtual CCN (VCCN). The unique problem is the cache component, i.e., the content store, in CCN. This paper will develop a VCCN Mapping Algorithm (VCCNMA) that optimizes the performances of VCCN considering the content store request in addition to CPU and bandwidth. Since the resource allocation problem is NP-hard, this paper thus proposes a heuristic algorithm. Several sets of simulation experiments are performed to evaluate the acceptance ratio, the network cost, the storage utilization ratio and load balance. Results show that the algorithm can achieve better performances. Moreover, the paper also studies the tradeoffs between the network cost and the load balance.

/pdf/embedding-algorithm-for-virtualizing-content-centric-4hb3sxq5zw.pdf

Embedding Algorithm for Virtualizing Content-Centric Networks in a Shared Substrate

Drifting with oceanic current forces is an unique mobility pattern for the underwater sensor networks. The different current velocities at the different depth levels and the periodic velocities can impact the three dimensional network deployment greatly over time. One outcome of such impact is the disruption to the network connectivity. In this paper, a routing protocol that utilizes the bridging nodes is introduced to tackle the connectivity problem. The protocol bears features that explore the unique mobility pattern and geological structure to suppress transmission overhead and improve energy efficiency.

http://wuwnet.acm.org/2012/files/Papers/06_paper47.pdf

Routing with bridging nodes for drifting mobility

In this paper, we propose a distributed online multichannel assignment and routing algorithm called LOAM. Using LOAM algorithm, a node in the network assigns channels for the incoming traffic flows and forwards them based on the channel usage information of its nearby nodes. We also present a model to analyze the throughput of multichannel networks and prove LOAM can achieve more than a fraction of the optimal throughput. Furthermore, we compare the achievable throughput of LOAM with a centralized offline channel assignment algorithm in average cases considering different channel rate and traffic load scenarios, the results of which demonstrate that LOAM can achieve more than 90% of theoretical maximum throughput and has a more balanced load distribution. Finally, we evaluate LOAM in a realistically simulated 802.11a wireless multihop network, compared with a random channel assignment algorithm. The simulation results show that LOAM can deliver up to 25 percent more messages with a shorter delivery latency.

A locally-optimizing approach for multichannel assignment and routing

Wireless sensor networks, in our paper, MICAz radio boards with sensors attached to them. Allow us to collect many information around us. When multiple collaborated input streams present, understanding the data with correct data fusion algorithms is important. In this paper, we will present the influences of the thresholds on data from wireless sensors. The hardware used in our project is the Berkeley mote MPR2400 and the MTS310 sensor board. The MIB600 is used as the Ethernet gateway interface for the motes. The MTS310 sensor is used successfully in the project to collect data from passing vehicles. The main topic of this project was to implement a form of machine learning by having the back end computer predict with high confidence that there is a vehicle present. The program MoteView is very efficient in configuring and surveying the motes in real time. This paper is an attempt to demonstrate the abilities of the current wireless sensor network technology.

Effects of multiple collaborated data streams in wireless sensor networks

In recent years, Open Flow [1] is becoming a popular network architecture. As more and more users starts to join the conventional Internet, the drawbacks of the conventional networks are now gradually appearing. OpenFlow network provides us a brand new sight to the development of networks. This architecture separates the control plane and data plane from the hardware level(physically). OpenFlow has plenty of benefit compare to other network structures. Firstly, the control plane and data plane are decoupled, this means more flexible networks can be figure out with customized rules in the network. Secondly, OpenFlow provides us a new platform to design and test network protocols. Researchers could test new protocols in a real network environment. Thirdly, in OpenFlow architecture networks we could monitor flow traffic statistics. This fine-grained monitoring of flows enables us to better understanding the network protocols and scheme we applied.

Xiaoyan Hong

Papers

Embedding Algorithm for Virtualizing Content-Centric Networks in a Shared Substrate

Routing with bridging nodes for drifting mobility

A locally-optimizing approach for multichannel assignment and routing

Effects of multiple collaborated data streams in wireless sensor networks

A Control-Message Quenching Algorithm in Openflow-Based Wireless Mesh Networks with Dynamic Spectrum Access