EuroFGI Workshop on IP QoS and Traffic Control TITOLO. A Receiver Side Approach for Real-Time Monitoring of IP Performance Metrics

Transcription

1 EuroFGI Workhop on IP QoS n Trff Conrol TITOLO A Rvr S Approh for Rl-T Monorng of IP Prforn Mr TESI R. G. Grroppo, S. Gorno, F. Oppno, G. Pro Dp. of Inforon Engnrng Unvry of P 1 Lbon, Porugl, Dbr 6-7, 27

2 Ouln Movon for h work Prpul n Nwork QoS prr RTP/RTCP b rvr urn frwork Exprnl rul Conulon 2 Lbon, Porugl, Dbr 6-7, 27

3 Movon Currn rn: onor rl- prv quly of vo rv hrough IP lvl urn MOS-lk or b on rl urn of IP lvl QoS prr Pk lo On wy ly Dly Jr N for pl hnqu o IP lvl QoS prr Objv: vlop purly rvr ofwr frwork o xr IP lvl QoS r fro RTP/RTCP flow Sll n for NTP ynhronzon bu no n for ny ohr oopron bwn rnl 3 Lbon, Porugl, Dbr 6-7, 27

4 # * # * Quly of Srv (QoS) L n n g M O S Co n v ro n l M O S S u b j v q u ly n Lo u n Do ro n D ly E h o O b j v q u ly n T r n l q u ly p r r J r b u ff r ly J r b u ff r o v rflo w Co n g o ro n N wo rk q u ly p r r N wo rk p k lo N wo rk ly N wo rk j r E h o n llo n Nwork Pk lo T r n l gn p r r Co r/ D o r D j r b u ff r P k z N wo rk gn / n g n p r r IP p k ly J r E h o n ll r Ln k u lzo n Nwork jr Nwork Dly IP N w ork IP P h o n IP P h o n 4 Lbon, Porugl, Dbr 6-7, 27

5 IP lvl QoS Prr Pk lo On wy ly Jr T T +Δ Auo Doron N for pk lo onln (PLC) My pr onvron N n xr ly oul nrou lo (jr buffr ovrflow) T IP Nwork Djr buffr Dor Snr Rvr Dyn jr buffr rqur rl- onorng 5 Lbon, Porugl, Dbr 6-7, 27

6 RTP Hr: V P X CC M RTP proool 31 P T Squn Nu br RTP p Synhronzon Sour ID (SSR C) Conrbung Sour ID (CSRC) - oponl Squn Nubr RTP p RTP p Nubr of rn pk T gp bwn rn pk No nough for on wy ly on! Pk lo Jr 6 Lbon, Porugl, Dbr 6-7, 27

7 RTCP proool RTCP Hr : 31 V P R C P k y p Lngh S nr S S R C N T P p ( on ) N T P p (fr onl) R T P p S nr P k oun S nr O oun RTCP-Snr-Rpor NTP p RTP p Trnon of h fr rv RTP pk 7 Lbon, Porugl, Dbr 6-7, 27

8 RTP p Snr : Δ NTP * β β = RTP_ClokR 1 RTP p Fr RTP RTP_n Tp un NTP p 1 n Fr NTP Δ NTP! #! " ( ) ( ) ( ) ( ) SR 1 1 = SR #! #! " ( ) ( ) ( ) ( ) 1 # 1 = NTP_n RTP RTCP-SR 8 Lbon, Porugl, Dbr 6-7, 27

9 D r rf opnon Th bolu of h fr rv RTP pk opu by ung h o r β Th ul o r vr wh n y ffr gnfnly fro nonl vlu 2 18 y l Dly (.) Soluon: up on of β vry rv RTCP-SR ( ) (1) g ˆ! SR, n $! SR,1 " n # n = = # ( ) (1) n + $ % 9 Lbon, Porugl, Dbr 6-7, Ph rrv x 1 4 Rv pk SR, n SR,1 SR, n

10 Exprnl Tb nx Mu nx95 Cllr Cll Gnong (now Ekg) VoIP rnl Cor nwork ul by Lnux rour runnng NIST N Opnour w h n nrou uoz lo, ly n jr 1 Lbon, Porugl, Dbr 6-7, 27

11 Pk Lo r p h p Pk rop r n o z r F PERDITA DI PACCHETTI Ph rrv PCM CODEC Pk Lo Rv pk PCM r p h p Pk rop r n o z r F % Pk Lo Pk Lo PERDITA DI PACCHETTI GSM Ph rrv Rv pk GSM CODEC 11 Lbon, Porugl, Dbr 6-7, 27

12 Dly Jr 3 Pk jr (ly=5) JITTER DEI PACCHETTI RTP (ly=5) r j Jr () Jr 5 PCM Ph rrv PCM CODEC Rv pk r j Jr () Pk jr (ly=5) JITTER DEI PACCHETTI RTP (ly=5) GSM Ph rrv Rv pk GSM CODEC 12 Lbon, Porugl, Dbr 6-7, 27

13 On wy ly (1) 1 9 On wy ly RITARDO END-TO-END DEI PACCHETTI RTP PCM y l Dly () Dly Ph rrv x 1 4 PCM Rv pk y l Dly () On wy ly RITARDO END-TO-END DEI PACCHETTI RTP GSM Ph rrv GSM Rv pk 13 Lbon, Porugl, Dbr 6-7, 27

14 On wy ly (2) 14 On wy ly RITARDO END-TO-END DEI PACCHETTI RTP PCM y l Dly () Dly On wy ly RITARDO ENDTOEND DEI PACCHETTI RTP GSM Ph rrv x 1 4 PCM Rv pk y l Dly () Ph rrv GSM Rv pk 14 Lbon, Porugl, Dbr 6-7, 27

15 On wy ly (3) 2 On wy ly RITARDO END-TO-END DEI PACCHETTI RTP y l Dly () PCM Ph rrv x 1 4 PCM Rv pk y l Dly () Dly On wy ly RITARDO END-TO-END DEI PACCHETTI RTP 4 2 GSM Ph rrv GSM Rv pk x Lbon, Porugl, Dbr 6-7, 27

16 Conluon Ingr ofwr frwork for IP lvl urn of RTP onnon Rvr pproh b on nforon rr by RTP n RTCP proool Aul plnon wh oluon of plnng u: Co rf opnon Cop wh ou-of-nr RTCP g onruon Exprnl vlon 16 Lbon, Porugl, Dbr 6-7, 27