Wireless Network-on-Chip (WNoC) has been proposed to overcome long-distance communication bottlenecks of wired NoCs. Token passing mechanism has generally been adapted to allocate the wireless channel among Wireless Interfaces (WIs). In this work, we propose a comparator based controller to provide a flexible and efficient channel allocation scheme. It utilizes a comparator attached to the antenna, along with modifications to header flit to perform channel allocation along with power gating WIs to save energy. Evaluation of proposed scheme on CPU/GPU system shows 53% reduction in token passes and 9% energy saving as compared to timer based approach.