In CCN (Content-Centric Networking), one request retrieves at most one data packet. Although the design intent of such rule is to maintain flow balance across the network, it may cause significant underutilization of Data downlink, especially in networks with asymmetric up/down link speed such as cellular networks. This paper describes an adaptive flow control mechanism where multiple Data messages per Interest are allowed in an adaptive manner without violating the operational principle of original CCN protocol. The performance of proposed scheme is demonstrated in an experimental testbed implementation built with CCNx open source code and its extension.
We propose an adaptive Interest (or content request message) adjustment scheme as an additional enhancement to the CCN (Content-Centric Networking) flow control algorithm described in [11], where the one-to-one message exchange nature of CCN was re-architected to enable more effective one-to-many message exchange. The proposed scheme adaptively determines the optimal transmission time of successive Interest messages, thus effectively adjusts the transmission window size to further enhance link utilization while preserving the benefit of reducing the total number of Interest messages. The optimality of this transmission time interval between Interest messages is a critical factor to the downlink throughput especially with a narrowband uplink as in cellular network, because too frequent Interest message transmissions likely cause uplink congestion while too infrequent transmissions may also cause underutilization of the downlink. This paper proposes an adaptive scheme for optimal Interest transmission time that fully utilizes the downlink while minimizing the unnecessary uplink congestion. The performance of proposed scheme is validated in an experimental testbed built with the CCNx [10] open source code.
Recently many types of mobile devices have spread out. And also needs for, emerging applications of contents mass distribution, on wireless network are rapidly increasing. Due to limited capacity of wireless, Matrix Network Coding (MNC) based multicast scheme was proposed to support these applications effectively. Though MNC based multicast scheme is considered as one of the optimal solutions for multicast applications, this still has problems on unpredictable wireless network condition. In this paper, we propose cache aided MNC multicast scheme to solve these problems and present experimental results demonstrating its effectiveness.
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