Disruptive CSMA with credit payback (CP) protocols for multi-radio network

In this paper, we study a multi-radio network, where at least one station has multi-standard transceivers operated simultaneously. A radio at the multi-radio device can suffer service disruptions due to interference from collocated radios or due to constraints from shared resources. In this paper, we study the impact of temporal disruption on fairness for CSMA-based network, such as WLAN. We propose a novel credit payback (CP) mechanism to mitigate the impact of such disruptions. Credits are saved during disruptions and used to compensate the lost transmission opportunities of disruptive stations. We study the key parameter-credit payback ratio via theoretical analysis and simulations, considering two specific cases: random and regular. We also propose a local adaptive credit payback algorithm to achieve desired fairness performance without global information. Numerical results from both analytical models and simulations are presented to illustrate several interesting observations and to demonstrate the benefits of our solution.