A system comprises a network congestion monitoring module for monitoring a congestion-related metric of a wireless medium, the congestion-related metric being based on traffic class, e.g., average contention window; a contention-period/contention-free-period (CP/CFP) adaptation module coupled to the network congestion monitoring module for generating CP/CFP information, e.g., CP/CFP duration information and/or traffic class shifting information, in response to the at least one congestion-related metric; a point coordinator module coupled to the CP/CFP adaptation module for coordinating access to the wireless medium using a point coordination function, e.g., HCCA, based on the CP/CFP information; and a distributed coordinator module coupled to the CP/CFP adaptation module for coordinating access to the wireless medium using a distributed coordination function, e.g., EDCA, based on the CP/CFP information.