Tham khảo tài liệu 'future aeronautical communications part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 138 Future Aeronautical Communications not applicable for the OP part. In the all-integrated scenario however CC is applicable to the NON-OP traffic in order to ensure that the NON-OP traffic cannot cause congestion in the network which is adversely affecting the OP services. Scheduling I Queuing Packets are stored in queues until they can be transmitted on the link. The scheduling algorithm then determines the order in which the queues are served . the order according to which packets of the different queues are sent. For DiffServ architectures in the Internet commonly known queues are Expedited Forwarding EF Assured Forwarding AF and Best Effort BE . Many different scheduling algorithms are known from the literature such as First In First Out FIFO Round Robin RR Weighted Round Robin WRR Weighted Fair Queuing WFQ Deficit Round Robin DRR Stochastic Fair Queuing SFQ or Worst Case Weighted Fair Queuing WF2Q . For wireless communication other scheduling algorithms taking the wireless nature of the medium into account are defined such as for instance Idealized Wireless Fair Queuing IWFQ Wireless Packet Scheduling WPS Channel Condition Independent Fair Queuing CIF-Q Wireless Fair Service Algorithms WFS or Proportional Fair Queuing PF . These lists are clearly not exhaustive but shall provide only a fundamental overview. Within the aeronautical scenario the queuing and scheduling has especial importance since the priority of a packet is directly impacted by it. The COCR defines a range of different Classes of Service CoS which also refer to the priority of a packet . measured in terms of TD95 . Proper scheduling techniques ensure that packets belonging to a higher priority service are also transmitted earlier over the link. The scheduling thus addresses the design requirements which state that the different services within a service category . for instance DG-C and DG-E within the ATS service category can be prioritized. Furthermore the scheduling ensures that .
