Đang chuẩn bị liên kết để tải về tài liệu:
Advanced Transmission Techniques in WiMAX Part 14

Tham khảo tài liệu 'advanced transmission techniques in wimax part 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 316 Advanced Transmission Techniques in WiMAX Fig. 26. Debit of HO from 802.16e to 802.11s Video With the video traffic the debit values decrease comparing to the other traffic types. 5. Conclusion The interoperability and the vertical handover between different networks present currently a real challenge to overcome. The difference of networks operation is the main reason of this problem. And for pass to the 4G networks it is important to resolve this problem of interoperability between different networks. Our work has focused on the interconnection between two wireless radio networks of the IEEE 802 family and we are concentrating on the QoS aspect for several traffics types especially during the handover process. For doing that we have proposed two interconnection models based on two recent handover mechanisms and we have simulated those two models with three mobile speeds and in the both directions of networks. Observing the results obtained we can conclude that with a low or medium speed of displacement of a mobile station the both techniques IEEE 802.21 and MSCTP present a good solution during the vertical handover. With the two techniques there are very few interruptions during the vertical handover. But based on details of simulation results we notice that with MSCTP protocol we obtained a QoS level slightly better than that obtained with MIH architecture. Interaction and Interconnection Between 802.16e 802.11s 317 Also the handover from 802.11s to 802.16e generates results better than the opposite case of handover. But with a high speed it is the opposite rather because the mobile WIMAX supports better the increasing speeds and also the results in this case are still not acceptable comparing by QoS level needed for each traffic type. It should be noted that during all the simulations the scenarios proposed does not include cell congestion or lack of available resources. For future work we will propose interconnection models between networks of different .