Emulation is a cost effective and efficient tool to perform performances evaluation and innovative access and network techniques validation. Its ability to interconnect real equipments with real applications provides excellent demonstrations means. The main problem is to overcome the emulation weakness which is the accuracy of the model reproducing the systems to be evaluated. Owing to its modular design and implementation, the PLATINE satellite emulation platform, presented in this paper, is able to emulate a complete DVB-RCS (Digital Video Broadcasting -Return Channel via Satellite)-DVB-S2 (Digital Video Broadcasting -Second) system in a realistic and flexible way. It is possible to configure the platform to emulate a transparent DVB-RCS system dimensioned around a single Hub, or to emulate a system using a regenerative satellite with an onboard switching matrix. Different DVB-RCS protocol stacks are implemented, and the adaptive physical layer is emulated in real time thanks to precalculated DRA schemes and MODCOD files. A DiffServ-like QoS Architecture that couples MAC and IP-Layer QoS mechanisms and Layer 2 security framework are currently under development. At the network side, IPv4 and IPv6 are fully supported as well as IPv6 mobility and dynamic multicast. In this paper, we mainly focus on the emulation platform and the tools developed to help the performance analysis of the emulated system.
The Datagram Congestion Control Protocol (DCCP) [1] is being proposed by IETF as a transport protocol to support multimedia traffic. Two congestion controls mechanisms have been proposed so far for DCCP, namely TCP-Like [2] and TCP-Friendly Rate Control (TFRC) [3]. In this paper, we experimentally investigate the DCCP performance with its two congestion control algorithms for two kinds of video streaming applications, those using XVID [4] and MPEG [5] codecs. The first stream want to make quick use of any available bandwidth, while the second prefer to minimize abrupt changes in the sending rate. Our results confirm these preferences for each stream regard to DCCP congestion controls.
Next-generation broadband satellite systems will have the capability to provide costeffective universal broadband access for the users. In order to meet users' requirements on high quality multimedia services, many enhancements have to be made on the existing satellite technologies. One of the promising methods is the introduction of cross-layer design. There are several advantages of a layered approach since modularity, robustness and ease of designs are achieved without difficulty. However the properties of the different layers have substantial interdependencies and a modularised design may therefore be suboptimal with regards to performance and availability in a hybrid satellite and mobile wireless environment. In this paper, we will carry out a review of the cross-layer design in satellite systems. Based on this, a cross-layer architecture for the next-generation broadband satellite system is proposed. The proposed cross-layer architecture has two main components: QoS and resource management and mobility management. In each component, the cross-layer techniques that have been used are described in details.
Next-generation broadband satellite systems will have the capability to provide cost-effective universal broadband access for the users. But in order to meet users' requirements, many enhancements have to be made on the existing satellite technologies. One of the promising methods is the introduction of cross-layer design. There are several advantages of a layered approach, since modularity, robustness and ease of designs are easily achieved. However the properties of the different layers have substantial interdependencies and a modularized design may therefore be suboptimal with regards to performance and availability. In this paper, we will carry out a review of crosslayer design in general, and based on this a cross-layer architecture for the next-generation broadband satellite system is proposed. Two main components are identified in the proposed cross-layer architecture: QoS and resource management and mobility management. ©2008 IEEE
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