This paper improves the video prediction mechanism used for prediction of the uplink real-time traffic of an integrated satellite and WiMAX network. After a bibliographic search on mechanisms for video prediction in WiMAX and satellite networks, the NLMS (Normalized Least Mean Square) algorithm is chosen to be used as part of the existing mechanism, studying three possible alternatives that can be used. The first one proposes the implementation of the NLMS algorithm in the WiMAX BS (Base Station), the second one proposes the implementation of the NLMS algorithm in the satellite terminal, while the third one proposes the implementation of the NLMS algorithm in both the WiMAX BS and the satellite terminal. Simulation results show improved performance of all alternatives, while the best results are given by the second one which also has the lowest complexity in computations and memory. This alternative is finally presented and evaluated.

The IEEE 802.16e standard provides a high degree of flexibility for setting up and operating mobile WiMAX networks in metropolitan environments. While the standard supports differentiated Quality of Service (QoS), crucial functions such as traffic scheduling and slot allocation are left as open issues to the research community. This paper focuses on these two features, that consist an NP-Hard problem, and provides an integrated solution. The key component of the proposal is the “Colored OFDMA Frame Registry Tree Scheduler” (CO-FRTS) that achieves QoS-aware resource allocation by using an advanced tree structure to prepare the creation of time frames, and reduce processing requirements. An extended simulation model reveals the improved performance of the proposed solution, compared to other competent proposals.

In this paper, we describe and evaluate an advanced traffic scheduler for IEEE 802.16 point-to-multipoint networks, referred to as "Colored Frame Registry Tree Scheduler" (C- FRTS). The main characteristics of this scheduler are i) the use of a tree structure to prepare the creation of time frame maps and reduce processing requirements at the beginning of each frame, and ii) a colored discrimination of packets scheduled for transmission to guarantee the bandwidth reserved for different connections. Simulation results show that C-FRTS can guarantee major QoS parameters, such as the maximum latency and the minimum and maximum reserved bandwidth, as well as provide differentiated treatment to the various service types.

The IEEE 802.16 standard provides a high degree of flexibility for setting up and operating wireless broadband networks in metropolitan environments. The standard supports numerous capabilities, including mesh topologies and multimedia communications. In this paper, we study these two features by investigating how efficiently an IEEE 802.16 mesh network can treat distributed multimedia traffic by providing differentiated quality of service (QoS). A key component of the system is the ldquoenhanced frame registry tree schedulerrdquo (E-FRTS) that provides QoS-aware resource allocation using a tree structure to prepare the creation of time frames and reduce processing requirements at the beginning of each frame. Simulation results show that distributed multimedia traffic can be efficiently supported in mesh 802.16 networks, provided efficient scheduling and a reasonable number of hops.

IEEE 802.16 is considered today as the most promising technology, to provide extension of wireless broadband communications into metropolitan environments. One of the main design challenges in 802.16 is the introduction of an efficient traffic scheduler that handles resource allocation in the wireless interface. This paper proposes such a scheduler, referred to as the "frame registry tree scheduler", that aims at providing differentiated treatment to data connections, based on their QoS characteristics. The scheduler uses a tree structure in order to prepare time frame creation and reduce processing needs at the beginning of each time frame. Simulation results show that the proposed scheduler can attain considerable improvement in terms of throughput and packet losses