A Simulation-Based Study of Scheduling Algorithms for DVB- RCS Based Satellite Communication Systems Students: Inbal Cohen Jonatan Roisman Supervisors: Dr. Yehuda Ben-Shimol Mr. Itzik Kitroser Ben-Gurion University of The Negev, Department of Communication System Engineering

The Project’s Goals  MF-TDMA networks  Allocation of the resources  The project ’ s goal Implement a simulated DVB-RCS based system that supports QoS to the applications and efficiently utilizes the channel bandwidth DVB-RCS = Digital Video Broadcasting - Return Channel Satellite

Solution Outlines Step 1: Study the evolving DVB-RCS standard Step 2: Study the network simulator Step 3: Develop a detailed block diagram Step 4: Modular software implementation Step 5: Simulation based-study

The DVB-RCS Standard  Part of the DVB standards for satellite communication  Purpose of the standard  Maintained by the DVB Project  Officially defined in ETSI EN

VSat NCC: Network Control Center Includes: Feeder and Traffic Gateway Network Control Center: provides Control and Monitoring Functions (CMF) Traffic Gateway: receives the Vsat’s return signals Satellite Forward Link Satellite Return Link Feeder: transmits the forward link signal VSat: Very Small Aperture Terminal Internet/ Intranet PSTN Satellite Networks

Simulator Modules Satellite Forward LinkSatellite Return Link Internet/ Intranet PSTN VSat NCC: Network Control Center Includes: Feeder and Traffic Gateway Network Control Center: a NCC provides Control and Monitoring Functions (CMF). It generates control and timing signals for the operation of the Satellite Interactive Network to be transmitted by one or several Feeder Stations Traffic Gateway: a TG receives the VSat return signals, provides accounting functions, interactive services and/or connections to external public, proprietary and private service providers (data bases, pay-per-view TV or video sources, software download, tele-shopping, tele-banking, financial services, stock market access, interactive games etc.) and networks (Internet, ISDN, PSTN, etc.) Feeder: a Feeder transmits the forward link signal, which is a standard satellite digital video broadcast (DVB-S) uplink, onto which are multiplexed the user data and/or the control and timing signals needed for the operation of the Satellite Interactive Network VSat: Very Small Aperture Terminal Satellite Forward LinkSatellite Return Link Internet/ Intranet PSTN VSat NCC: Network Control Center Includes: Feeder and Traffic Gateway Network Control Center: a NCC provides Control and Monitoring Functions (CMF). It generates control and timing signals for the operation of the Satellite Interactive Network to be transmitted by one or several Feeder Stations Traffic Gateway: a TG receives the VSat return signals, provides accounting functions, interactive services and/or connections to external public, proprietary and private service providers (data bases, pay-per-view TV or video sources, software download, tele-shopping, tele-banking, financial services, stock market access, interactive games etc.) and networks (Internet, ISDN, PSTN, etc.) Feeder: a Feeder transmits the forward link signal, which is a standard satellite digital video broadcast (DVB-S) uplink, onto which are multiplexed the user data and/or the control and timing signals needed for the operation of the Satellite Interactive Network VSat: Very Small Aperture Terminal Satellite Forward LinkSatellite Return Link Internet/ Intranet PSTN VSat NCC: Network Control Center Includes: Feeder and Traffic Gateway Network Control Center: a NCC provides Control and Monitoring Functions (CMF). It generates control and timing signals for the operation of the Satellite Interactive Network to be transmitted by one or several Feeder Stations Traffic Gateway: a TG receives the VSat return signals, provides accounting functions, interactive services and/or connections to external public, proprietary and private service providers (data bases, pay-per-view TV or video sources, software download, tele-shopping, tele-banking, financial services, stock market access, interactive games etc.) and networks (Internet, ISDN, PSTN, etc.) Feeder: a Feeder transmits the forward link signal, which is a standard satellite digital video broadcast (DVB-S) uplink, onto which are multiplexed the user data and/or the control and timing signals needed for the operation of the Satellite Interactive Network VSat: Very Small Aperture Terminal Satellite Forward LinkSatellite Return Link Internet/ Intranet PSTN VSat NCC: Network Control Center Includes: Feeder and Traffic Gateway Network Control Center: a NCC provides Control and Monitoring Functions (CMF). It generates control and timing signals for the operation of the Satellite Interactive Network to be transmitted by one or several Feeder Stations Traffic Gateway: a TG receives the VSat return signals, provides accounting functions, interactive services and/or connections to external public, proprietary and private service providers (data bases, pay-per-view TV or video sources, software download, tele-shopping, tele-banking, financial services, stock market access, interactive games etc.) and networks (Internet, ISDN, PSTN, etc.) Feeder: a Feeder transmits the forward link signal, which is a standard satellite digital video broadcast (DVB-S) uplink, onto which are multiplexed the user data and/or the control and timing signals needed for the operation of the Satellite Interactive Network VSat: Very Small Aperture Terminal Satellite Forward LinkSatellite Return Link Internet/ Intranet PSTN VSat NCC: Network Control Center Includes: Feeder and Traffic Gateway Network Control Center: a NCC provides Control and Monitoring Functions (CMF). It generates control and timing signals for the operation of the Satellite Interactive Network to be transmitted by one or several Feeder Stations Traffic Gateway: a TG receives the VSat return signals, provides accounting functions, interactive services and/or connections to external public, proprietary and private service providers (data bases, pay-per-view TV or video sources, software download, tele-shopping, tele-banking, financial services, stock market access, interactive games etc.) and networks (Internet, ISDN, PSTN, etc.) Feeder: a Feeder transmits the forward link signal, which is a standard satellite digital video broadcast (DVB-S) uplink, onto which are multiplexed the user data and/or the control and timing signals needed for the operation of the Satellite Interactive Network VSat: Very Small Aperture Terminal Internet/ Intranet PSTN VSat Satellite Forward LinkSatellite Return Link VSat Channel VSat Hub

Hub Module DataRequestDataRequest Data Scheduling Algorithm SI Tables Map Data Scheduling Principles Prefix Method/ Contention Method Data & Request

Scheduling Principles Time Domain Frequency Domain Policer High Priority Low Priority Medium Priority Input Queues Scheduling Algorithm Under Qos Constrains 2D Mapping According to DVB-RCS Standard Superfarme

SI Tables Time Domain Frequency Domain Superframe 2 Frame 3 Timeslot Frame Timeslot SI Tables 1. Superframe Composition Table (SCT) 2. Frame Composition Table (FCT) 3. Time-Slot Composition Table (TCT) 4. Satellite Position Table (SPT) 5. Correction Message Table (CMT) 6. Terminal Burst Time Plan (TBTP)

VSat Module Data Voice Update Classify: Queue number? Sequence number is 0? C_R Data SI Tables Time Out? Threshold? Data Prefix Method? Contention Method? Request Data

Packet Channel Module Packet

OMNeT ++  Objective Modular Network Test-bed in C++  OMNeT++ attributes  Primary application area  Generic and flexible architecture

Read Standard (DVB-RCS) Team Work Design Review for Satellite Network Working with The Industry (Gilat Satellite Networks) How to Simulate a Communication Network OMNeT++ (Simulation Tool) Practicing C++ How to combine Study, Project and Mundial…. ( ) What have we learned so far ?