In named data networking, a router forwards Interests to all available contents including copies under the original design of forwarding strategy. All of these redundant copies of requested contents are returned to the user, which leads to unnecessary waste of network resources. In this paper, we propose a new forwarding strategy named counteracting redundant data CRD to reduce the transmission of redundant Data. The CRD strategy introduces a new packet called Data Acknowledgement DACK to stop forwarding redundant data. When a router receives a DACK, it will delete the matched Pending Interest Table PIT entry with the same name prefix and same incoming interface as the DACK. Thus, subsequent Data will be discarded when the corresponding PIT entry in the router no longer exists. According to the transmission model with tree structure, forwarding number that indicates the number of DACK being forwarded is a very important factor affecting the transmission overhead of CRD strategy. In our simulation, the results show the CRD strategy can improve transmission efficiency, reduce transmission overhead while ensuring a certain reliability, and also decrease the storage of content store at the same time. Copyright © 2015 John Wiley & Sons, Ltd.
['Huan Yan', 'Deyun Gao', 'Wei Su', 'Han-Chieh Chao']
A forwarding strategy of counteracting redundancy data in named data networking