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The proportional delay differentiation (PDD) is one of the most well-known quality of service (QoS) models and has drawn much attention because of its 'controllable' and 'predictable' characteristics. How to provide PDD in a wireless LAN (WLAN) is addressed and a cross-layer fine-tuning scheduling (CFS) scheme with the goal to maintain PDD among all wireless stations is proposed, while improving performance in a WLAN. CFS additionally considers the time-varying channel capacity to schedule packets, finely tunes the contention window and properly arbitrates the backoff time. Also, it operates in a fully distributed manner among all stations and in a cross-layer approach in each station. The simulation results demonstrate that the CFS scheme can provide more satisfactory PDD and higher performance in a WLAN, compared with 802.1 le.