A Fully Distributed Game Theoretic Approach to Guarantee Self-Coexistence among WRANs

Abstract

Although the proliferation of wireless applications operating in unlicensed spectrum bands has resulted in overcrowding, recent analysis has shown that license bands are still underutilized. Cognitive Radio is seen as the key enabling technology to address the spectrum shortage problem, opportunistically using the spectrum allocated for TV bands. In this paper, we present a novel game theoretic framework that uses the potentialities of the new IEEE 802.22 Standard to guarantee self-coexistence among Wireless Regional Area Networks. We address this problem as a channel assignment problem where each WRAN acquires a chunk of spectrum free of interference in a dynamic and distributed way. Using a novel technique to compute backoff windows, we show that the channel assignment problem can be formulated as a multi-player non-cooperative repeated potential game that converges to a Nash Equilibrium point. We consider each WRAN as a player of our game and we use two different types of utility functions to maximize the spatial reuse and minimize the interference. An extensive simulation study shows that having the interference minimization as objective is not necessarily the best solution with selfish players

A Decentralized Approach for Self-Coexistence Among Heterogeneous Networks in TVWS

“…The self-coexistence problem between wireless regional area networks was presented in [21]. The channel assignment problem was formulated as a non-cooperative potential game with utility functions aiming at maximizing the spatial reuse and minimizing the interference.…”

“…Again, it chooses the duplet of channels (c,c') which maximize the value of !,!,!! , and performs the switch (lines [18][19][20][21] Calculate ! given !…”

Self-Coexistence Strategy in Heterogeneous Cognitive Radio Networks

“…only one WRAN can changes its strategy in each stage. Similar to the IEEE 802.22, we take backoff window (BW) to solve this problem [24]. As shown in the following section.…”

Cooperative vs. non-cooperative: Self-coexistence among selfish cognitive devices

“…We adopt the backoff mechanism defined in [3] where each player computes its backoff window based on the amount of interference on the transmission channel and on the number of competitors.…”

“…We choose to have 1/3 for the uplink and 2/3 for the downlink. The BS transmission range is random in [20, 23] km, the capture threshold is chosen random in [3,4] and the maximum coalition size is set to 5 because using The experiments were conducted considering 20 digital TV transmitters (DTVs) and 10 microphones in a square area of 200 × 200 km 2 . The transmission range of a microphone is 10 m and the transmission power of a DTV is in [1,5000] kW.…”