QUALITY OF SERVICE MAINTENANCE OF A WIRELESS LINK IN A WIRELESS LAN

摘要

To provide suitable QoS in a WLAN distributing voice, data and multimed ia broadband in any end-to-end context, RF link errors are monitored in real ti me and applied as input to recovery and corrective procedures. The performance measures considered in normally evaluating a link QoS include throughput (bandwidth), delay, jitter and bit error rate (BER) but these alone do not properly evaluate a QoS for real-time services. In the exemplary embodiment, the frame error rate (FER) is compared with a threshol d to define quality. If the error threshold is exceeded recovery procedures are instituted to restore the desired signal quality. The exemplary WLAN system has a capacity for providing isochronous services, such as broadband multimedia (including high speed video) and real-time toll quality voice service, and includes real time erro r detection and recovery procedures to maintain a desired individualized Quality of Service (QoS) appropriate for individual services.