On the Effect of Malicious User on D2D Cluster: CSI Forgery and Countermeasures

Device-to-device (D2D) communication in cellular networks refers to a technology that enables direct transmission and reception between devices proximity without infrastructures such as base stations (BSs). It has consistently attracted attention due its key role extending coverage through the configuration of clusters, which D2D belonging cluster can either be head or member. In this paper, we investigate effect channel state information (CSI) forgery attacks single malicious user (i.e., attacker) cluster. Particularly, two major threat models: 1) CLUSTERING FAILURE ATTACK, where an attacker reports overestimated CSI instead original one BS during clustering, 2) quality service (QoS) degradation attack underestimated intra-cluster communications multicasting). We define metrics measure each PROBABILITY CLUSTER SUM-RATE, respectively, further derive closed-form expression for PROBABILITY. addition, propose threshold-based defense mechanisms countermeasures against find suboptimal threshold values. Through simulations, evaluate performance terms comparing with optimal simulation results.