Adaptive interest adjustment in CCN flow control

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.