Among many Infrastructures based Middle-wares proposed Global Sensor Network (GSN) is one among them to mitigate the co-existence issue to interconnect IP based and legacy Wireless Sensor Networks. It is an open-source, Infrastructure based abstraction Middle-ware developed in Java. Though there are advantages like simplicity, adaptability, lightweight and scalability, there are still few areas for improvement. This paper attempts to identify those, propose an enhanced architecture and analyze with a case-study. Data-Acquisition module is one area to peek in. GSN represents every WSN as a Virtual Sensor (VS) using XML. Based on its requirements, each user application aggregates data from various Wireless Sensor Networks (Virtual Sensors). As the data format is Virtual Sensor specific, it is the responsibility of every heterogeneous user application to identify and resolve data discrepancy if any. Moreover, the data aggregation method employed is not explicitly described and when investigated, is no different than the lower level abstractions. Hence this paper proposes an enhanced architecture with an adaptable data aggregation achievable via integrated Network Coding and a global data format as part of the Middle-ware. .

1. Berlin Erin Anzelmo, Alex Bassi, Dan Caprio, Sean Dodson, Rob van Kranenburg, Matt Ratto. :Discussion Paper on the Internet of Things commissioned by the Institute for Internet and Society, (2011 )
2. Joseph Davies. : Understanding IPv6 book
3. Montenegro G, Kushalnagar N, Hui J, Culler D. : Transmission of IPv6 Packets over IEEE 802. 15. 4 Networks. Internet Engineering Task Force, Request for Comments 4944, (2007).
4. K. Aberer, M. Hauswirth, A. Salehi: Global Sensor Networks. Technical report LSIR-REPORT-2006-001, Lausanne, Switzerland (2006)
5. Teemu Laukkarinen, Jukka Suhonen, and Marko H ? nnik ? inen :A Survey of Wireless Sensor Network Abstraction for Application Development , Department of Computer Systems, Tampere University of Technology, Research Article, International Journal of Distributed Sensor Networks ,(2012)
6. K. Aberer, M. Hauswirth, A. Salehi: A Middle-ware for fast and flexible sensor network Deployment. Proc. Of International Conference on Very Large Data Bases (VLDB), Seoul, Korea (2006)
7. Miao-Miao Wang, Jian-Nong Cao2, Jing Li1, and Sajal K. Das: Middle-ware for wireless sensor networks: a survey : Journal of Computer Science and Technology 23(3): 305–32, (2008 )
8. Cecilia Mascolo, Stephen Hailes. : Survey of Middle-ware for networked embedded systems. Technical Report for Project: Reconfigurable Ubiquitous Networked Embedded Systems, University College London, (2005).
9. Kay R ?omer, Oliver Kasten, Friedemann Mattern. : Middle- ware challenges for wireless sensor networks. Mobile Computing and Communications Review, (2002).
10. Salem Hadim and Nader Mohamed : Middle-ware for Wireless Sensor Networks: A Survey : Department of Electrical and Computer Engineering , Stevens Institute of Technology , Hoboken, NJ 07030, USA , IEEE, (2006)
12. Hnin Yu Shwe and Xiaohong Jiang : Efficient power savings in wireless sensor networks with network coding and overhearing avoidance :Electrical and Communication Engineering, Graduate School of Engineering, Tohoku University, 6-6-05 Aza-Aoba, Aramaki, Aoba-ku, Sendai, 980-8579 Japan. , International Journal of Computer Engineering Research Vol. 2(2), pp. 34-44, (2011)
14. Hnin Yu Shwe and Fumiyuki Adachi : Power Efficient Adaptive Network Coding in Wireless Sensor Networks , Department of Electrical and Communication Engineering Graduate School of Engineering, Tohoku University , Sendai, Japan, IEEE ICC proceedings (2011 )
16. Takahiro MATSUDA, Taku NOGUCHI, and Tetsuya TAKINE: Survey of Network Coding and Its Applications :INVITED SURVEY PAPER ,IEICE TRANS. COMMUN. , VOL. E94–B, NO. 3 ,(2011 )
18. Luca Mainetti, Luigi Patrono, and Antonio Vilei: Evolution of Wireless Sensor Networks towards the Internet of Things: a Survey: 19th International Conference on Software, Telecommunications and Computer Networks (SoftCOM), (2011 )

Global Sensor Networks (gsn) Data Aggregation Network Coding