Optimizing Uplink Scheduling in IEEE 802.11bn UHR Networks with NPCA Primary Channel Access (Published)
This article explores uplink scheduling optimization in IEEE 802.11bn Ultra High Reliability (UHR) networks utilizing Non-Primary Channel Access (NPCA) functionality. NPCA enhances network resilience by enabling devices to switch to alternative channels when the primary channel experiences congestion, but introduces challenges in uplink scheduling efficiency and fairness. Traditional Enhanced Distributed Channel Access (EDCA) mechanisms prove inadequate in time-constrained NPCA scenarios due to collision probability and fairness concerns. The proposed solution implements a trigger-based uplink optimization approach through carefully configured Multi-user EDCA parameters. By setting Arbitration Interframe Space values to zero for all Access Categories and implementing maximum MU-EDCA timer values with timer reset mechanisms, the approach shifts from distributed contention to centralized AP-controlled scheduling. This comprehensive architecture delivers multiple technical benefits: enhanced fairness through sophisticated scheduling algorithms, collision elimination through coordinated access, reduced overhead through parameter optimization, and extended control windows through timer management. The trigger-based approach transforms NPCA operation into a highly efficient, predictable communication channel suitable for applications with strict quality of service requirements in interference-prone environments.
Keywords: MU-EDCA parameters, non-primary channel access, trigger-based scheduling, ultra-high reliability, uplink optimization