Nghiên cứu chất lượng trải nghiệm cho mạng IPTV1

B GIO DC V O TO TRNG I HC BCH KHOA H NI ng Th Yn NG TH YN in t - Vin thụng NGHIấN CU CHT LNG TRI NGHIM CHO MNG IPTV LUN VN THC S K THUT Chuyờn ngnh : in t - Vin thụng KHO 2010B H Ni Nm 2012 B GIO DC V O TO TRNG I HC BCH KHOA H NI - NG TH YN NGHIấN CU CHT LNG TRI NGHIM CHO MNG IPTV Chuyờn ngnh : in t - Vin Thụng LUN VN THC S K THUT IN T - VIN THễNG NGI HNG DN KHOA HC : TS TRNG THU HNG H Ni Nm 2012 Nghiờn cu cht lng tri nghim cho mng IPTV MC LC DANH MC HèNH V DANH MC BNG BIU DANH MC T VIT TT LI M U CHNG I TNG QUAN V IPTV 10 1.1 Gii thiu v truyn hỡnh s theo giao thc IP 10 1.2 Cu trỳc mng IPTV 11 1.3 Cỏc dch v v ng dng ca IPTV 13 1.3.1 Truyn hỡnh qung bỏ k thut s 13 1.3.2 Video theo yờu cu VoD 14 1.3.3 Qung cỏo cú a ch 14 1.4 u im ca IP v s la chn IP cho IPTV 15 CHNG II NGUYấN Lí THC HIN DCH V IPTV TRấN IMS 17 2.1 Tng quan IMS 17 2.1.1 IMS l gỡ? 17 2.1.2 Kin trỳc IMS 18 2.2 Kin trỳc IPTV trờn nn IMS 25 2.2.1 Kin trỳc chc nng 27 2.3 Li ớch tiờu dựng ca IPTV da trờn IMS 31 2.4 Nhng li ớch ca nh khai thỏc 32 2.5 Cỏc th tc x lý chng trỡnh 35 2.5.1 Quỏ trỡnh ng kớ 35 2.5.2 Quỏ trỡnh nhn v thụng tin cỏc kờnh 37 2.5.3 Quỏ trỡnh thit lp kt ni vi kờnh 38 CHNG III QoS TRONG IPTV 40 3.1 Khỏi nim v cht lng dch v (QoS) 40 3.3.Cỏc tham s nh hng n cht lng dch v mng IPTV 42 3.3.1 Bng thụng Bandwidth 42 3.3.2 tr - Delay 43 3.3.3 bin thiờn tr - Delay variation/Jitter 45 3.3.4 Mt gúi Packet loss 46 CHNG IV QoE TRONG IPTV 48 ng Th Yn CB100733 Nghiờn cu cht lng tri nghim cho mng IPTV 4.1.Tng quan v QoE 48 4.1.1 Gii thiu chung 48 4.1.2 Khỏi nim QoE 49 4.1.3 Liờn quan gia QoS v QoE 49 4.1.4 Cu trỳc v cỏc yu t nh hng QoE 52 4.1.5 QoE khỏch quan v QoE ch quan[20] 54 4.2.QoE cho dch v IPTV 56 4.2.1 Cỏc yu t ca QoE cho IPTV 56 4.2.2 Lm th no m bo IPTV QoE 58 4.2.3 Thỏch thc chớnh ca cỏc yu t IPTV QoE 59 4.2.3.1.Cht lng Media(Video v Audio) 59 4.2.3.2.Channel Zapping 60 4.2.3.3 Tớnh tin cy 61 4.2.3.4.Tớnh bo mt 62 4.2.4 o c IPTV QoE 63 4.2.4.1.Cỏc mụ hỡnh ỏnh giỏ QoE khỏch quan 63 4.2.4.2.Cỏc thụng s v gii thut ỏnh giỏ IPTV QoE 67 CHNG V C LNG QOE 73 5.1 Túm tt lý thuyt 74 5.1.1 Gii thiu phng phỏp mỏy hc Machine learning 74 5.1.2 Cỏc thut toỏn hc mỏy 75 5.1.3 Hc cú giỏm sỏt 76 5.1.4 Thut toỏn cõy quyt nh 78 5.1.4.1 Gii thiu chung 78 5.1.4.2 Cỏc loi cõy quyt nh 79 5.1.4.3 u im ca cõy quyt nh 80 5.1.4.4 Biu din cõy quyt nh 81 5.1.4.5 La chn thuc tớnh kim tra 83 5.2.Mt s hỡnh nh demo cho thut toỏn c lng c trin khai testbed 89 KT LUN 93 Ti liu tham kho .94 ng Th Yn CB100733 Nghiờn cu cht lng tri nghim cho mng IPTV DANH MC HèNH V Hỡnh 1.1 S n gin ca mt h thng IPTV .12 Hỡnh 2.1 Kin trỳc IMS theo 3GPP[5] 18 Hỡnh 2.2 Cỏc mỏy ch ng dng IMS 22 Hỡnh 2.3 Kt ni IMS v mng PSTN/CS 222 Hỡnh Liờn kt vi mng IP phiờn bn khỏc 25 Hỡnh Cỏc chớnh IMS 26 Hỡnh Kin trỳc chc nng cỏc dch v IPTV da trờn IMS [15] 27 Hỡnh Mụ hỡnh IPTV da trờn IMS [2] .30 Hỡnh Quỏ trỡnh ng nhp h thng (1) .35 Hỡnh Quỏ trỡnh ng nhp h thng (2) 36 Hỡnh 10 Quỏ trỡnh ng nhp h thng (3) .37 Hỡnh 11 Quỏ trỡnh nhn v thụng tin cỏc kờnh .37 Hỡnh 12 Quỏ trỡnh thit lp kt ni vi kờnh .39 Hỡnh ỏnh giỏ theo h th giỏc ch quan ca NSD 51 Hỡnh Cu trỳc QoE 52 Hỡnh Cỏc yu t k thut ca IPTV QoE 57 Hỡnh 4 Mụ hỡnh trin khai tham chiu khụng y .67 Hỡnh Mụ hỡnh MPQM ỏnh giỏ QoE ca IPTV 70 Hỡnh Mụ hỡnh MPQM mc tng quan 70 Hỡnh Mụ hỡnh c ch t ỏnh giỏ QoE 73 Hỡnh Cõy quyt nh QoE 88 Hỡnh Mụ hỡnh kho sỏt QoE IPTV trờn nn IMS 89 Hỡnh Giao din ghi li kt qu d liu .90 Hỡnh 5 Thi gian chuyn kờnh .91 Hỡnh im thi gian chuyn kờnh .91 Hỡnh im ỏnh giỏ cht lng 92 Hỡnh Cỏc kt qu c cp nht vo bng d liu 92 ng Th Yn CB100733 Nghiờn cu cht lng tri nghim cho mng IPTV DANH MC BNG BIU Bng Phõn loi cỏc lp dch v theo ITU T[8] .41 Bng Phõn loi cỏc lp dch v theo ETSI 41 Bng Thng kờ v s quan tõm n khỏi nim QoE v QoS 49 Bng Vớ d v cỏc thụng s chớnh QoE .53 Bng Vớ d v o c khỏch quan hiu sut s dng 55 Bng 4 Vớ d v o c ch quan hiu sut s dng .56 Bng nh ngha cỏc thang im MOS 67 Bng Kt qu test th nghim QoE 82 ng Th Yn CB100733 Nghiờn cu cht lng tri nghim cho mng IPTV DANH MC T VIT TT STT T vit Tờn y 01 3GPP Third Generation Partnership Project 02 3GPP2 Third Generation Partnership Project 03 ACK Acknowledgment 04 ADSL Asymmetric Digital Subscriber Line 05 AS Application Server 06 ATM Asynchoronous Transfer Mode 07 B2BUA Back-to-back User Agent 08 BGCF Breakout Gateway Control Function 09 BICC Bearer Independent Call Control 10 COPS Common Open Policy Service 11 CSCF Call Session Control Function 12 DHCP Dynamic Host Configuration Protocol 13 DNS Domain Name System 14 ENUM Telephone Number Mapping 15 GGSN Gateway GPRS Support Node 16 GPRS General Packet Radio Service 17 GSM Global System for Mobile Communications 18 HLR Home Location Register 19 HSS Home Subscriber Server 20 HTTP Hypertext Transfer Protocol 21 I-CSCF Interrogating-CSCF 22 IETF Internet Engineering Task Force 23 IFC Initial Filter Criteria 24 IM-SSF IP Multimedia Service Switching Function 25 IMS IP Multimedia Subsystem 26 IMSI International Mobile Subscriber Identifier ng Th Yn CB100733 Nghiờn cu cht lng tri nghim cho mng IPTV 27 IP Internet Protocol 28 IP-CAN IP Connectivity Access Network 29 ISC IMS Service Control 30 ISIM IP multimedia Services Identity Module 31 ISUP ISDN User Part 32 ITU-T International Telecommunication Union- 33 MAP Mobile Application Part 34 MEGACO Media Gateway Control 35 MGCF Media Gateway Control Function 36 MGW Media Gateway 37 MIME Multipurpose Internet Mail Extensions 38 MRF Media Resource Function 39 MRFC Media Resource Function Controllers 40 MRFP Media Resource Function Processors 41 MSISDN Mobile Subscriber ISDN Number 42 NAI Network Access Identifier 43 OSA-SCS Open Service AccessService Capability 44 P-CSCF Proxy-CSCF 45 PA Presence Agent 46 PDF Policy Decision Function 47 PEP Policy Enforcement Point 48 PIDF Presence Information Data Format 49 PS Presence Agent 50 PSTN Public Switched Telephone Network 51 QoE Quality of Experience 52 QoS Quality of Service 53 RTP Real-Time Transport Protocol 54 RTCP RTP Control Protocol ng Th Yn CB100733 Nghiờn cu cht lng tri nghim cho mng IPTV 55 RTSP Real Time Streaming Protocol 56 S-CSCF Serving-CSCF 57 SCTP Stream Control Transmission Protocol 58 SDP Session Description Protocol 59 SFC Subsequent Filter Criteria 60 SGSN Serving GPRS Support Node 61 SGW Signalling Gateway 62 SIM Subscriber Indetity Module 63 SIP Session Initiation Protocol 64 SLF Subscriber Location Function 65 SPT Service Point Trigger 66 SS7 Sinaling System No 67 TCP Transmission Control Protocol 68 THIG Topology Hiding Inter-network Gateway 69 UA User Agent 70 UAC User Agent Client 71 UAS User Agent Server 72 UDA User Data Answer 73 UDP User Datagram Protocol 74 UDR User Data Request 75 UE User Equipment 76 UICC Universal Integrated Circuit Card 77 UMTS Universal Mobile Telecommunication System 78 URI Uniform Resource Identifier 79 URL Uniform Resource Locator 80 USIM Universal Subscriber Identity Module 81 VoIP Voice over IP 82 VoD Video on Demand ng Th Yn CB100733 Nghiờn cu cht lng tri nghim cho mng IPTV 83 VQM Video Quanlity Metrics 84 WLAN Wireless Local Access Network 85 WFQ Weighted Fair Queuing 86 WLSS WebLogic SIP Server ng Th Yn CB100733 Nghiờn cu cht lng tri nghim cho mng IPTV Ta xột xem cỏc thụng s Delay, Jitter, Packet loss nh hng nh th no ti im ỏnh giỏ cht lng ca ngi dựng vi cỏc thang im nh sau : MOS = Excellent - khụng cm nhn thy MOS = Good - Cm nhn thy nhng khụng khú chu MOS = Fair - Cm nhn thy nhng hi khú chu MOS = Poor - khú chu MOS = Bad - rt khú chu Sau th nghim thỡ ta cú bng kt qu d liu sau : Bng Kt qu test th nghim QoE STT 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 Bit Rate (kbps) 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 15 Frame Rate (Frame/s) 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 ng Th Yn CB100733 Delay (ms) 500 400 400 200 700 800 500 500 300 300 300 300 150 500 500 500 500 500 500 500 500 500 500 500 500 500 500 Jitter (ms) 500 400 200 0 0 100 150 200 120 120 450 400 300 200 100 100 200 100 200 100 150 150 150 Packet loss (%) MOS 0 0 1 1 2 3 3 3 2 1 1 2 1 82 Nghiờn cu cht lng tri nghim cho mng IPTV 28 29 30 15 15 15 64 64 64 500 0 0 1 T bng d liu ny ta s tin hnh phõn tớch v xõy dng cõy quyt nh phn sau 5.1.4.5 La chn thuc tớnh kim tra Ti mi nỳt, chn thuc tớnh kim tra nh th no? Chn thuc tớnh quan trng nht cho cho vic phõn lp cỏc vớ d hc gn vi nỳt ú Lm th no ỏnh giỏ kh nng ca mt thuc tớnh i vi vic phõn tỏch cỏc vớ d hc theo theo nhón lp ca chỳng?? S dng mt ỏnh giỏ thng kờ Information Gain Vớ d: Xột bi toỏn phõn lp cú lp (c1, c2) thuc tớnh no A1 hay A2 nờn c chn l thuc tớnh kim tra Entropy Mt ỏnh giỏ thng c s dng lnh vc Information Theory ỏnh giỏ mc hn (impurity/inhomogeneity) ca mt S i vi vic phõn lp cú c lp p log p Trong ú, pi l t l cỏc vớ d S thuc vo lp i ng Th Yn CB100733 83 Nghiờn cu cht lng tri nghim cho mng IPTV Entropy ca S i vi vic phõn lp cú lp : log í ngha ca entropy lnh vc lý thuyt truyn tin Entropy ca S ch s lng bits cn thit mó húa lp ca mt phn t c ly ngu nhiờn t S Entropy ca S i vi phõn lp cú lp bi toỏn QoE: Phõn tớch 30 dũng d liu cú MOS = 1:4 ú cú : 13 giỏ tr cú MOS = 10 giỏ tr cú MOS = giỏ tr cú MOS = giỏ tr cú MOS = giỏ tr cú MOS = Vy ta s tớnh c Entropy ca S: Entropy(S) = -(13/30).log2(13/30) -(10/30).log2(10/30) -(6/30).log2(6/30) - (1/30).log2(1/30) -(0/30).log2(0/30)= 1,679 Entropy =0, nu tt c cỏc vớ d thuc cựng mt lp ng Th Yn CB100733 84 Nghiờn cu cht lng tri nghim cho mng IPTV Entropy =1, s lng cỏc vớ d thuc v lp c1 bng s lng cỏc vớ d thuc v lp c2 Entropy = mt giỏ tr khong (0,1), nu nh s lng cỏc vớ d thuc v lp c1 khỏc vi s lng cỏc vớ d thuc v lp c2 Information Gain Information Gain ca mt thuc tớnh i vi mt cỏc vớ d: Information Gain ca thuc tớnh A i vi S Gain S, A |S | |S| S ú Values(A) l cỏc giỏ tr cú th ca thuc tớnh A, v Sv = {x | x S, xA=v} Trong cụng thc trờn, thnh phn th th hin giỏ tr Entropy sau S c phõn chia bi cỏc giỏ tr ca thuc tớnh A í ngha ca Gain(S, A): S lng bits gim c (reduced) i vi vic mó húa lp ca mt phn t c ly ngu nhiờn t S, bit giỏ tr ca thuc tớnh A Hóy tớnh giỏ tr Information Gain ca thuc tớnh Delay i vi hc S Gain(S,Delay)? Thuc tớnh Delay cú cỏc giỏ tr cú th: 800, 700, 500, 400, 300, 200, 150, ms - S800 = {1 im cú giỏ tr Delay = 800 ms} => Entropy(S800) = - S700 = {1 im cú giỏ tr Delay = 700 ms} => Entropy(S700) = - S500 = { im 1, im 2, im cú giỏ tr Delay = 500 ms} => Entropy(S500) = -(9/18).log2(9/18) -(7/18).log2(7/18) -(2/18).log2(2/18) = 1,382 ng Th Yn CB100733 85 Nghiờn cu cht lng tri nghim cho mng IPTV - S400 = {1 im v im 1cú giỏ tr Delay = 430ms} =>Entropy(S430) = - S300 = {1 im 1, im 2, im 3, im cú giỏ tr Delay=300 ms} => Entropy(S300) = -(1/4).log2(1/4) -(1/4).log2(1/4) -(1/4).log2(1/4) (1/4).log2(1/4) = - S150 = {1 im cú giỏ tr Delay=150 ms} => Entropy(S150) = - S0 = {1 im v im cú giỏ tr Delay = ms} => Entropy(S0) = Gain (S, Delay) = Entropy(S) - (1/30).Entropy(S800) - (1/30).Entropy(S700) (18/30).Entropy(S500) - (2/30).Entropy(S400) - (4/30).Entropy(S300) - (1/30).Entropy(S200) - (1/30).Entropy(S150) - (2/30).Entropy(S0) = 0,45 Ti nỳt gc, thuc tớnh no s {Delay, Jitter, Packet loss, } nờn c chn l thuc tớnh kim tra? Tng t tớnh nh thuc tớnh delay Gain(S, Delay) = 0,45 Gain(S, Jitter) = 0,462 Gain(S, Packet loss) = 0,623 Chn thuc tớnh Cú giỏ tr IG cao nht Vỡ vy, Packet loss c chn l thuc tớnh kim tra cho nỳt gc! ng Th Yn CB100733 86 Nghiờn cu cht lng tri nghim cho mng IPTV Ti nỳt Node1, thuc tớnh no s {Delay, packet loss} nờn c chn l thuc tớnh kim tra? Lu ý! Thuc tớnh Packet loss b loi bi vỡ nú ó c s dng bi cha ca nỳt Node1 (l nỳt gc) Gain(S0 , Delay) = 1,46 Gain(S0, Jitter) = Tng t tớnh nh vy ta cú cõy quyt nh ng Th Yn CB100733 87 Nghiờn cu cht lng tri nghim cho mng IPTV Hỡnh Cõy quyt nh QoE T cõy quyt nh rỳt kt lun - Vi ngun video cú tc bit rate 64kbps v Frame rate = 16 thỡ ngi dựng luụn cm nhn thy li vỡ th khụng cú MOS = - Khi Packet loss thỡ cht lng video mc khụng th chp nhn c, ngi dựng cm nhn khú chu xem video - Tng t vi mc packet loss = , thỡ cg luụn gõy khú chu cho ngi xem Vi packet loss = , delay 400, jitter 120 thỡ cht lng mc chp nhn c , delay 700 thỡ li gõy cm giỏc khú chu ngi xem - Vi packet loss = 1, jitter 150 thỡ cht lng mc chp nhn c, jitter v delay mc cao hn thỡ cht lng khụng th chp nhn c ng Th Yn CB100733 88 Nghiờn cu cht lng tri nghim cho mng IPTV =>Vi lung video ny nh hng ca packet loss ti cm nhn ngi dựng l rt ln vỡ vy cn chỳ ý luụn cho packet loss v mc thp 5.2 Mt s hỡnh nh demo cho thut toỏn c lng c trin khai testbed Mụ hỡnh kho sỏt QoE IPTV trn nn IMS Hỡnh Mụ hỡnh kho sỏt QoE IPTV trờn nn IMS Cỏc thnh phn: Open IMS core : Open IMS Core l mt d ỏn mó ngun m ca vin FOKUS ca c bao gm : + CallSession Control Functions (CSCFs) : nh tuyn cỏc yu t trung tõm cho tớn hiu IMS + Home Subscriber Server (HSS) nhiờn dng thu gn v ng Th Yn CB100733 89 Nghiờn cu cht lng tri nghim cho mng IPTV c gi l FhoSS : Qun lý h s ngi dựng v liờn kt cỏc qui tc nh tuyn Appication Server AS : l mt thnh phn SIP, thc hin chc nng tip nhn v x lý dch v AS kt ni vi S-CFCS thụng qua giao tip SIP Media streaming server : Lu tr v thc hin truyn d liu media õy ta dựng Darwin streaming server lu tr v truyn d liu video IMS client : c phỏt trin chy cỏc dch v qua IMS core Sau cu hỡnh cho h thng testbed chy ta s thc hin nhim v test: Hỡnh Giao din ghi li kt qu d liu ng Th Yn CB100733 90 Nghiờn cu cht lng tri nghim cho mng IPTV Hỡnh 5 Thi gian chuyn kờnh Hỡnh im thi gian chuyn kờnh ng Th Yn CB100733 91 Nghiờn cu cht lng tri nghim cho mng IPTV Hỡnh im ỏnh giỏ cht lng Hỡnh Cỏc kt qu c cp nht vo bng d liu ng Th Yn CB100733 92 Nghiờn cu cht lng tri nghim cho mng IPTV KT LUN Theo xu hng phỏt trin ngy nay, IPTV thc s hn l ngnh cụng nghip dch v bựng n trờn internet IPTV c cỏc chuyờn gia nhỡn nhn l mt cụng ngh cú kh nng mang ti li nhun rt ln cho cỏc nh cung cp vin thụng mt tng lai gn Vi s phỏt trin ca cụng ngh truy cp bng rng v cỏc thit b sn xut chng trỡnh truyn hỡnh, cỏc chuyờn gia tin tng rng IPTV thc s cú kh nng cnh tranh vi cỏc chng trỡnh truyn hỡnh v tinh, truyn hỡnh cỏp hay cỏc loi truyn hỡnh thụng thng Mc dự cú nhiu u im cnh tranh vi truyn hỡnh truyn thng hin nay, nhng truyn hỡnh IPTV cú nhc im ln l cht lng ph thuc hon ton vo ng truyn internet Vỡ vy trin khai thỏc cỏc dch v IPTV cn phi cú mt nn tng mng bng rng cht lng v an ton Bờn cnh ú, vic qun lý mng IPTV i vo hot ng cng l cn phi c bit chỳ ý, vỡ hiu qu ca mng cao hay thp ph thuc vo yu t ny Trờn õy, thụng qua thut toỏn cõy quyt nh, em ó ỏnh giỏ s b s nh hng ca cỏc yu t QoS nh : delay, jitter, packet loss ti cht lng tri nghim QoE v a cỏc ch tiờu k thut v QoS m bo c QoE Hin nay, QoE cho IPTV cũn nhiu cn nghiờn cu nh QoE cho yu t channel zapping, tỡm cỏc cụng thc ỏnh x chun t QoS sang QoE, cỏc v tớnh tin cy, tớnh bo mt.Nu cỏc trờn c gii quyt thi gian ti thỡ dch v IPTV s cũn phỏt trin bựng n hn na Tuy nhiờn thi gian v lng kin thc ca bn thõn cũn hn ch nờn s ỏnh giỏ ny cha c y Vỡ th rt mong s quan tõm v úng gúp ý kin ca thy v cỏc bn ni dung lun hon thin hn Em xin chõn thnh cm n! ng Th Yn CB100733 93 Nghiờn cu cht lng tri nghim cho mng IPTV Ti liu tham kho [1] Alan B.Johnston (2004), SIP Understanding the session initiation protocol, second , edition Artech House telecommunications library [2] Anne Bodzinga (2008), Interworking IPTV Services with IMS, Lucent Tecnology, [3] Bjứrn Hestnes, Peter Brooks, Svein Heiestad , QoE (Quality of Experience) measuring QoE for improving the usage of telecommunication services [4] David Soldani, Man Li and Renaud Cuny (2006), QoS and QoE Management in UMTS Cellular Systems John Wiley & Sons, Ltd ISBN: 0-470-01639-6 [5] Fernando Kuipers, RobertKooij , Danny De Vleeschauwer, Kjell Brunnstrửm, Techniques for Measuring Quality of Experience [6] Gerard ODriscoll (2008), Next Generation IPTV Services and Technologies First edition, John Wiley & Sons, Inc [7] Georg Mayer, Hisham Khartabil and Aki Niemi (2006), The IMS IP Multimedia Concepts and Services, Second Edition Miikka PoikselkọJohn Wiley &Sons [8] Gilbert Held (2007), Understanding IPTV, First edition, Auerbach Publications, [9] ITU (11-18 December 2007), Quality of Experience Requirements for IPTV Services, 7thFG IPTV meeting: Qawra, St Pauls Bay, Malta [10] Jinyun Zhang, Yige Wang, Bo Rong (August 2009) QoS/QoE Techniques for IPTV Transmissions, TR2009-010 [11] Josộ Luis Martớnez, Pedro Cuenca, Francisco Delicado, Luis Orozco-Barbosa Instituto de Investigaciún en Informỏtica, On the capabilities of quality measures in video compression standards, Universidad de Castilla La Mancha, 02071, Albacete, Spain ng Th Yn CB100733 94 Nghiờn cu cht lng tri nghim cho mng IPTV [12] K Kilkki (2007), Next Generation Internet and Quality of Experience, EuroFGI IA.7.6 Workshop on Socio-Economic Issues of NGI, Santander, Spain, [13] Kuan-Ta Chen, and Chi-Jui Chang, Academia Sinica Chen-Chi Wu, Yu-Chun Chang, and Chin-Laung Lei, National Taiwan University ,Quadrant of Euphoria: A Crowdsourcing Platform for QoE Assessment [14] Markus Fiedler, Blekinge Institute of Technology Tobias Hossfeld v Phuoc Tran-Gia, University of Wỹrzburg, A Generic Quantitative Relationship between Quality of Experience and Quality of Service [15] Mikocry, (2008) IPTV Services over IMS: Architecture and Standardization, IEEE Communications Magazine [16]M Nunez (1991), The use of background knowledge in decision tree induction, Machine Learning, 6(3): 231-250, [17] Peter Brooks, Teolys, France Bjứrn Hestnes, User Measures of Quality of Experience: Why Being Objective and Quantitative Is Important, Telenor Research & Innovation, Norway [18] Tran Trong Son, Bong-Kyun Lee, Young-Tak Kim , Analysis of Transport Network QoS and QoE of IPTV Services, Dept of Information and Communication Engineering, Graduate School, Yeungnam University [19] T M Mitchell (1997) Machine Learning, McGraw-Hill [20] Yubing Wang, Survey of Objective Video Quality Measurements, EMC Corporation Hopkinton, MA 01748, USA [21] 2005Ensure IPTV Quality of Experience White PaperAgilent Technologies, Inc ng Th Yn CB100733 95 Nghiờn cu cht lng tri nghim cho mng IPTV [22] Trng Thu Hng (Nm hc 2010-2011), bi ging Cht lng tri nghim cho mng ni dung s IPTV vin in t - Vin thụng , H Bỏch Khoa H Ni [23] Hong Trng Minh (2007), Cht lng dch v IP [24] Nguyn Nht Quang (nm hc 2011-2012), bi ging Hc mỏy, vin Cụng ngh thụng tin v truyn thụng, H Bỏch khoa H Ni [25] http://www.tapchibcvt.gov.vn/ [26] http://iptv-vn.blogspot.com ng Th Yn CB100733 96 ... chất lượng trải nghiệm QoE(Quanlity of Experience) quan tâm Một cách đơn giản nhất, chất lượng trải nghiệm QoE nhận xét chủ quan người sử dụng đánh giá dịch vụ họ sử dụng Do việc nghiên cứu chất. .. loại bỏ hoàn toàn ảnh hưởng lỗi, cố mạng xử lý nội dung IPTV • Mạng gia đình Đồng Thị Yến – CB100733    12  Nghiên cứu chất lượng trải nghiệm cho mạng IPTV  Mạng gia đình liên kết thiết bị kỹ... CB100733    8  Nghiên cứu chất lượng trải nghiệm cho mạng IPTV  LỜI MỞ ĐẦU Trong năm gần truyền hình số phát triển rộng khắp, với phát triển nhanh chóng mạng internet băng rộng cho đời kĩ thuật