A channel bonding scheme with packet dropping mechanism in centralized cognitive radio networks

In order to conserve the network resources and reduce the system average delay, we propose a channel bonding scheme with packet dropping mechanism to control the secondary user (SU) packets' transmission. In this paper we assume the central controller can dynamically bond part of channels in the system to realize resource saving. At the same time, a packet dropping mechanism to the interrupted SU packets is introduced to help the central controller to reduce the system average delay. By building and analyzing a two-dimensional Markov chain model, some important performance measures, such as the blocking rate, throughput and average delay of the SU packets, and the channel closed ratio are derived. Moreover, we show the numerical results by comparing the system performance between the available channel bonding scheme with 1 persistent retransmission mechanism and the proposed channel bonding scheme with packet dropping mechanism.