Use Case Analysis
Simple use cases for configuring the test bed.
Stop the PSI/SI Process
- User clicks on "Stop" button under PSI/SI tab
- The webpage sends HTTP post message to http://cs-nsl-08.cs.surrey.sfu.ca:38000/ This http post message tells the back end script to terminate the main PSI/SI handler
- The backend script stops the TS NULL Shaper
Start the PSI/SI Process
- User clicks on "Start" button under PSI/SI tab
- The webpage sends HTTP post message to http://cs-nsl-08.cs.surrey.sfu.ca:48000/ This http post message tells the back end script to start the main PSI/SI handler
- The back end script parses the configuration file psisi.cfg
- The back end script based on psisi.cfg, creates the necessary PSI/SI files
- The back end script starts the TS NULL Shaper to replace null packets with PSI/SI info
Selecting Video to Broadcast
- User clicks on the "Video Files" tab.
- The system lists all available video on the server.
- Entries with existing check mark indicates it is currently in use.
- User selects video files that are not marked.
- User selects "Save" to submit the changes to the server.
- The system updates the videoslist.cfg file to reflect the changes.
Upload Video
- User clicks on the "Upload" tab.
- Select video to be uploaded from local computer.
- Enter assigned PID - Provider ID for the video. Example: 12343
- Enter length description for the video. Example: 2hrs 32 minutes
- Click Upload
- Browser post video file and data to the test bed server.
- User waits for the browser to refresh.
- The system confirms the video file was uploaded.
PSI/SI Configuration Parameters
- User clicks on "PSI/SI" tab
- User changes the parameters
- User clicks "Save"
- The system saves the changes to the psisi.cfg configuration file.
Adjusting Timeslicing Parameters
- User clicks on "Time Slicing" tab
- User selects the MPE_FEC Frame value, for example 1024 (possible values are 256, 512, 768, or 1024)
- Update dvbhparams.cfg with "MPE_FEC_Frame=1024"
- Backend script will add "-n 1024" to timeslicer
- User selects the OFDM guard interval value, for example 8 (possible values are 4, 8, 16, or 32)
- Update dvbhparams.cfg with "OFDM_Guard_Interval=8"
- Backend script will add "-g 8" to timeslicer
- User selects the OFDM bandwidth, for example 8 (possible values are 5, 6, 7, or 8)
- Update dvbhparams.cfg with "OFDM_Bandwidth=8"
- Backend script will add "-b 8" to timeslicer
- User selects the Code Rate, for example 3 (possible values are 1, 2, 3, 5 or 7)
- Update dvbhparams.cfg with "Code_Rate=3"
- Backend script will add "-c 3" to timeslicer
- User selects the constellation, for example qpsk (possible values are qpsk, 16qam, or 64qam)
- Update dvbhparams.cfg with "Constellation=qpsk"
- Backend script will add "-o qpsk" to timeslicer
- User sets the Delta_t value, for example 350 (possible values are integers between 100 and 3000)
- Update dvbhparams.cfg with "DeltaT=350"
- Backend script will add "-d 350" to timeslicer
- User selects the algorithm used, for example P2OPT (this is a faked feature though, may remove later)
- Update dvbhparams.cfg with "Time_Slicing_Algorithm=P2OPT"
- Backend script will not do anything for now :-)
- User clicks "Save"
- The system saves the changes to the timeslicing.cfg configuration file.
- Backend script use the latest configuration from timeslicing.cfg
Changing DVB-H Parameters
- User clicks on "DVB-H Parameters" tab
- User sets the Carrier Frequency value, for example 538Mhz (possible values are integers between 470 and 750)
- Update dvbhparams.cfg with "Carrier_Frequency=538"
- Backend script will add "-mf 538" to DtPlay
- User sets the Convolutional Rate value, for example 1/2 (possible values are 1/2, 2/3, 3/4, 4/5, 5/6, 6/7 or 7/8)
- Update dvbhparams.cfg with "Convolutional_Rate=1/2"
- Backend script will add "-mc 1/2" to DtPlay
- User sets the Guadr interval value, for example 1/4 (possible values are 1/4, 1/8, 1/16 or 1/32)
- Update dvbhparams.cfg with "Gaurd_Interval=1/4"
- Backend script will add "-mG 1/4" to DtPlay
- User selects the bandwidth, for example 8 (possible values are 5 6 7 or 8)
- Update dvbhparams.cfg with "Bandwidth=8"
- Backend script will add "-mB 8" to DtPlay
- User selects the constellation, for example QPSK (possible values are QPSK QAM16 or QAM64)
- Update dvbhparams.cfg with "Constellation=QPSK"
- Backend script will add "-mC QPSK" to DtPlay
- User selects the transmission mode, for example 8k (possible values are 2k 4k or 8k)
- Update dvbhparams.cfg with "Transmission_Mode=8k"
- Backend script will add "-mT 8k" to DtPlay
- User clicks "Save"
- The system saves the changes to the dvbhparams.cfg configuration file.
- Backend script use the latest configuration from dvbhparams.cfg
