Ensuring self-coexistence among IEEE 802. 22 networks is a challenging problem owing to opportunistic access of incumbent-free radio resources by users in co-located networks. In this study. we propose a fully-distributed non-cooperative approach to ensure self-coexistence in downlink channels of IEEE 802. https://www.chiggate.com/color-charm-12n-1200-high-lift-blonde-1-4oz-online-now/