Resource Management in Satellite Networks part 23 pps

... another, either by incorporating Inter -Satellite Links (ISLs) or a ground-based hub station in each footprint. All these issues contribute in making DBA an essential approach for providing the proper ... downlink spot-beams, the channel allocation will have to take into account also this aspect in order to maintain the overall QoS; this is particularly important in satellite- based...

Ngày tải lên: 05/07/2014, 19:20

... Chapter 1: INTRODUCTION TO SATELLITE COMMUNICATIONS 29 Fig. 1.9: Examples for the use of satellite links in telecommunication networks. interworking, to define a new network architecture and to include ... Multi-spot-beam satellite antenna • Bent-pipe satellite • Terrestrial gateway containing the scheduler (MAC layer) • Direct return link via satellite for channel quality measur...

Ngày tải lên: 05/07/2014, 19:20

... of multiple links corresponding to all the users that have activated the service in each (multicast) group. The role of the packet scheduler in S-MBMS is not that dominant in determining the system ... such information were available, it would have to be exploited in a complex way due to the point-to-multipoint nature of the services, i.e., the decisions regarding the scheduling of a...

Ngày tải lên: 05/07/2014, 19:20

... LEO satellites’ coverage area changes continuously over time, in order to maintain connectivity, end-users must switch from beam to beam and from satellite to satellite, resulting in frequent intra- ... functions of the individual modules in Figure 6.4 are as follows: • Switch Fabric: switching cells from input ports to appropriate output ports. • Input Processor: scheduling, buffer m...

Ngày tải lên: 05/07/2014, 19:20

... schemes. In this model, satellite footprints are modeled as rectangles. The overlapping area between successive satellites in the same orbital plane is not taken into account since in that case ... global revolution in information technology and satellite systems can be instrumental in the emerging network infrastructure. Nonetheless, CAC schemes for heterogeneous networks rem...

Ngày tải lên: 05/07/2014, 19:20

... guaranteed. In doing this, the effect of fading on the satellite channel is also taken into account. As in other works (see, e.g., [25]), when the fade countermeasure in use is modulation and coding rate ... the minimum SD bandwidth provision needed to track the SI QoS thresholds. Chapter 8: RESOURCE MANAGEMENT AND NETWORK LAYER 265 Redundant codes in hybrid networks Hybrid ne...

Ngày tải lên: 05/07/2014, 19:20

... specifies a satellite terminal known as a Satellite interactive Terminal (ST) or Return Channel Satellite Terminal (RCST) that supports a two-way DVB satellite system. The return link in DVB-RCS ... give the STs all the information needed for receiving and transmitting in the system. This includes, in addition to the tables already existing in the DVB-S system, tables informing...

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 ... 184, 189, 199, 257 Complete partitioning, 52, 179 Complete sharing, 52, 179 Call handover, 53, 189, 195, 214, 233 Inter -satellite handover, 54, 190, 194, 214 Intra -satellite handove...

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 ... considering interactions This page intentionally left blank Resource Management in Satellite Networks Optimization and Cross-Layer Design

Ngày tải lên: 05/07/2014, 19:20

... entitled “Integrated Space/Terrestrial Mobile Networks . He also contributed to the Resource Management activity of the Working Group 3000 within the RACE Project, called Satellite Integration in the ... (PRMA) protocols suitable for supporting voice and data transmissions in low earth orbit mobile satellite systems. In 1999 he joined the Information Engineering Department of th...

Ngày tải lên: 05/07/2014, 19:20