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Medium Access Control (MAC) protocols for Wireless Local Area Networks (WLANs) as well as Wireless Personal Area Networks (WPANs) like Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) are known to provide stable distributed channel access for multiple users. The wide acceptance of wireless systems operating in licensed-exempt frequencies demands for efficient spectrum usage of the scarce radio resources. In partially overlapping network scenarios where channel reuse becomes possible, the non-deterministic behavior prevents random access protocols from exploiting substantial reuse gain.
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