กลไกการรับส่งข้อมูลที่มีประสิทธิภาพสำหรับเครือข่ายยานพาหนะที่เน้นเนื้อหาเป็นศูนย์กลาง

Abstract

This thesis presents the three mechanisms. In the first part, the clustering technique is performed, the second part is caching replacement management for the cluster head, and the third part is cluster maintenance mechanism. In the first part, the Vehicular Content-Centric Networking in Cluster (VCCN-C) is the sub-clustering technique performed by the speed of the vehicle. A node of cluster acts as a cluster head to provide data services for cluster members. The cluster head handles to deliver packets among clusters. The advantage of this mechanism is to reduce the packet overhead and the data redundancy. The results are demonstrated the VCCN-C increases the performance of packet delivery delay and the hop counts are greater than the VCCN. In the second part, we design the Cache Replacement Content Popularity (CRCP) mechanism on the cluster head. The research is based on the Content Popularity (CP) of the data cached on the cluster head. The Exponential Moving Average (EMA) function is applied to evaluate the popularity of the content data in the cluster head. The results are proved the CRCP is better than the standard of cache replacement technique in term of average cached hit ratio. In the third part, the cluster maintenance mechanism is designed to solve the problem of the cluster head leaves from the cluster in the first part. We modify the mechanism in the first part in order to allow selecting one additional node for data backup, called Secondary Cluster Head (SCH). The local data access is guaranteed for cluster members. The results are explained the proposed mechanism improves the performance of the packet delivery delay and the average hop counts are better than the VCCN.