A Hybrid ICN Cache Coordination Scheme Based on Role Division between Cache Nodes

Abstract

Information-Centric Networking(ICN) is a paradigm shift from traditional TCP/IP's host-centric approaches,which relies on self-certifiable content, built-in pervasive innetwork caching and flexible request routing to provide native support for efficient and scalable content distribution from the architectural layer. Caching in ICN diverts from traditional Web Caching due to its arbitrary network topology and the requirement for line-rate operation, which makes cache coordination a crucial task. However, most of the cache coordination schemes proposed to date use uniform caching coordination policies within the same cache network, which is either hard to achieve good balance between user QoE and resource utilization or hard to scale. This paper proposes a hybrid cache coordination scheme that bases on cache node role separation. The cache network is divided into a core area and several edge areas. The core area applies an explicit and off-path cache coordination policy such as the HASH-based cache coordination to improve cache diversity within the cache network, whereas the edge areas can apply any implicit and on-path cache coordination policies such as LCE and LCD. The separation allows this scheme to be easily extended to large networks, and simulation results show that the hybrid schemes can achieve good balance between user QoE and network resource utilization.

Path Segmentation-Based Hybrid Caching in Information-Centric Networks

“…As shown in Figure 4a-c, the cache hit ratio increases with skewness (α). The cache hit ratio is related to network resource utilization [8]. In the three network topologies, LCE causes cache redundancy, and the hit ratio of LCE is the lowest.…”

“…We chose to divide each data return path into two segments-one segment is near the requesting user, called the user-edge area, and the other is relatively far from the user edge, called the non-edge area. Unlike node area division based on network topology information [8], this division of each return path is dynamic and temporary. We divide the nodes on the data return path according to the data transmission distance.…”

“…From the overall network perspective, the cache's diversity should be increased as much as possible [7]. An excellent caching scheme requires effective coordination between these two targets [8].…”

“…Caching schemes in ICN can be divided into several categories, including cooperative and non-cooperative caching, off-path, and on-path caching [9]. In cooperative caching, cache nodes make cooperative caching decisions based on network topology, as well as partial or global cache status [8], while in non-cooperative caching, each cache node makes caching decisions individually. Compared to non-cooperative caching, cooperative caching requires additional communication and computation overhead but is more practical.…”

Information‐Centric Networking Cache Placement Method Based on Cache Node Status and Location

“…At present, there are two classifications of ICN cache deployment strategies in academia. One is classified according to the cache location, which is divided into an on-path strategy and an off-path strategy [9]. On-path strategy means that the cache is deployed on the sending path of interest packages.…”