Resource Management in Satellite Networks part 21 doc

... communication infrastructure, IP QoS provisioning is a strategic issue in any kind of network. A view that has been gaining considerable interest in the scientific community considers that the IP Integrated ... ε 2 <ε 1 since real-time traffic is characterized by stringent QoS constraints. A similar CAC technique is combined in [23] with an in- band signaling scheme in order to comba...

Ngày tải lên: 05/07/2014, 19:20

... (Chapter 4), the two following parts are conceived according to the ETSI SES/BSM protocol stack, thus distinguishing cross-layer issues involving satellite- dependent layers (Part II, Chapters 5, 6 ... translated or copied in whole or in part without the bidden. The use in this publication of trade names, trademarks, service marks and similar terms, Resource Management in Sa...

Ngày tải lên: 05/07/2014, 19:20

... (from Earth to satellite to Earth and back) since layer 2 control functions are in the Earth station. In case of GEO regenerating satellites, RTD varies in the range 239-280 ms. In particular, RTD ... system, but the greater the difficulty in acquiring and maintaining synchronism. Time access to the satellite link can be managed either in centralized or in distributed mode. Ce...

Ngày tải lên: 05/07/2014, 19:20

... Fraunhofer Institute - FOKUS, Berlin, Germany 2.1 Introduction The efficient exploitation of common resources is an important aspect in networking, at all protocol layers. In satellite networking, in particular, ... channel-state information and the point-to-multipoint service set the difference between the packet scheduler in the satellite radio interface from its counterpart in p...

Ngày tải lên: 05/07/2014, 19:20

... quality (interpreted in this context in terms of E b /I 0 ) increases for GOOD and decreases for BAD channel conditions. Likewise, if the information rate is kept constant, maintaining the same ... scheduled UE in each TTI. In particular, the HS-DSCH encoding scheme is based on the Release’99 rate-1/3 turbo encoding, but adds rate matching with puncturing and repetition to obtain a hi...

Ngày tải lên: 05/07/2014, 19:20

... (thus incurring in packet losses due to channel state 2 Video packets exceeding the deadline are dropped; while, Web packets exceeding their deadline are sent anyway since they are related to interactive ... PACKET SCHEDULING TECH. 147 the video performance in the presence of significant Web traffic load. To cope with this, a differentiation in the priority index in equation (5.3) is need...

Ngày tải lên: 05/07/2014, 19:20

... most critical part in satellite communications is the communication link between the satellite and the user terminal (i.e., downlink). The downlink availability could be the limiting factor for ... and multipath fading. Shadowing of the satellite signal is due to obstacles in the propagation path (buildings, trees, bridges, etc). Whereas multipath fading occurs because the satell...

Ngày tải lên: 05/07/2014, 19:20

... to bottom (according to the reading order). Regarding signaling issues, this is translated into a simple FCT, since it indicates the common timeslot type (which is described in the Time Composition ... various bottleneck links, determined by 10 different fading classes (stemming from different source- destination pairs), under the Hotbird 6 link budget [28] and real fading traces. The “instan...

Ngày tải lên: 05/07/2014, 19:20

... IETF in proposing two IP QoS frameworks. These frameworks are mainly designed with terrestrial networks in mind. However, the problems of achieving QoS in networks with wireless medium such as satellite ... the potential of what can be achieved in terms of QoS provision. Being in adjacent layers in the protocol stack, resource management (layer 2) in satellite netwo...

Ngày tải lên: 05/07/2014, 19:20

... efficiency. In the forward link, the introduction of spreading requires the design of a new DVB-S2 receiver. In the return link, each terminal could in principle implement direct spreading within the ... 189, 195, 214 , 233 Inter -satellite handover, 54, 190, 194, 214 Intra -satellite handover, 54, 190, 191, 214 CDMA, 14 Channel quality indicator, 138 Channel utilization, 162, 305...

Ngày tải lên: 05/07/2014, 19:20