How is QoS (Quality of Service) implemented in wireless networks?

QoS in wireless networks ensures different traffic types receive appropriate treatment. Techniques include: Traffic classification marks packets by priority (VoIP highest, best-effort lowest). Scheduling algorithms (round-robin, weighted fair queuing, priority queuing) allocate resources. Admission control limits new connections to protect existing services. Rate limiting prevents bandwidth monopolization. WiFi uses WMM (WiFi Multimedia) with four access categories (Voice, Video, Best Effort, Background) and different AIFS, CWmin, CWmax. LTE provides QCI (QoS Class Identifier) mapping to bearers with guaranteed/non-guaranteed bit rates. 5G introduces network slicing for end-to-end QoS isolation.