Tese de mestrado integrado. Engenharia Electrotécnica e de Computadores. Universidade do Porto. Faculdade de Engenharia. 2011

Internet protocol TV (IPTV) is predicted to be the key technology winner in the future. Efforts to accelerate the deployment of IPTV centralized model which is combined of VHO, encoders, controller, access network and Home network. Regardless of whether the network is delivering live TV, VOD, or Time-shift TV, all content and network traffic resulting from subscriber requests must traverse the entire network from the super-headend all the way to each subscriber's Set-Top Box (STB).IPTV services require very stringent QoS guarantees When IPTV traffic shares the network resources with other traffic like data and voice, how to ensure their QoS and efficiently utilize the network resources is a key and challenging issue. For QoS measured in the network-centric terms of delay jitter, packet losses and bounds on delay. The main focus of this thesis is on the optimized bandwidth allocation and smooth datatransmission. The proposed traffic model for smooth delivering video service IPTV network with its QoS performance evaluation. According to Maglaris et al [5] First, analyze the coding bit rate of a single video source. Various statistical quantities are derived from bit rate data collected with a conditional replenishment inter frame coding scheme. Two correlated Markov process models (one in discrete time and one incontinuous time) are shown to fit the experimental data and are used to model the input rates of several independent sources into a statistical multiplexer. Preventive control mechanism which is to be include CAC, traffic policing used for traffic control.QoS has been evaluated of common bandwidth scheduler( FIFO) by use fluid models with Markovian queuing method and analysis the result by using simulator andanalytically, Which is measured the performance of the packet loss, overflow and mean waiting time among the network users.

Internet protocol TV (IPTV) is predicted to be the key technology winner in the future. Efforts to accelerate the deployment of IPTV centralized model which is combined of VHO, encoders, controller, access network and Home network. Regardless of whether the network is delivering live TV, VOD, or Time-shift TV, all content and network traffic resulting from subscriber requests must traverse the entire network from the super-headend all the way to each subscriber's Set-Top Box (STB). IPTV services require very stringent QoS guarantees When IPTV traffic shares the network resources with other traffic like data and voice, how to ensure their QoS and efficiently utilize the network resources is a key and challenging issue. For QoS measured in the network-centric terms of delay jitter, packet losses and bounds on delay. The main focus of this thesis is on the optimized bandwidth allocation and smooth data transmission. The proposed traffic model for smooth delivering video service IPTV network with its QoS performance evaluation. According to Maglaris et al [5] first, analyze the coding bit rate of a single video source. Various statistical quantities are derived from bit rate data collected with a conditional replenishment inter frame coding scheme. Two correlated Markov process models (one in discrete time and one in continuous time) are shown to fit the experimental data and are used to model the input rates of several independent sources into a statistical multiplexer. Preventive control mechanism which is to be including CAC, traffic policing used for traffic control. QoS has been evaluated of common bandwidth scheduler( FIFO) by use fluid models with Markovian queuing method and analysis the result by using simulator and analytically, Which is measured the performance of the packet loss, overflow and mean waiting time among the network users.

Το αντικείμενο της παρούσας διπλωματικής εργασίας είναι η μελέτη της ψηφιακής τηλεόρασης μέσω πρωτόκολλου Internet, γνωστής και ως IPTV (Internet Protocol TeleVision) με ιδιαίτερη εστίαση στον αποκωδικοποιητή που χρησιμοποιείται για την επίτευξη της τηλεοπτικής μετάδοσης. Αυτός ο αποκωδικοποιητής ονομάζεται Set-Top Box. Στην ουσία το IPTV είναι η μετάδοση τηλεοπτικού σήματος μέσω ευρυζωνικής σύνδεσης που χρησιμοποιεί το πρωτόκολλο IP μέσω ενός ιδιωτικού κλειστού δικτύου και όχι του δημοσίου Internet. Το IPTV θεωρείται το παρόν και το μέλλον όσον αφορά τα είδη τηλεόρασης καθώς ο χρήστης έχει την δυνατότητα για πρόσβαση σε τηλεοπτικά κανάλια με ψηφιακή εικόνα ενώ η δυνατότητα που παρέχουν οι on-demand υπηρεσίες για παρακολούθηση τηλεοπτικού περιεχομένου παντός τύπου την ώρα που επιθυμεί ο χρήστης καθιστά το «πακέτο» πολύ πιο ελκυστικό. Συγκεκριμένα, σε αυτή την διπλωματική εργασία, παρουσιάζεται αρχικά ο ορισμός της δικτυακής τηλεόρασης και γενικά όλων αυτών που συνέβαλλαν στην δημιουργία του IPTV. Κατόπιν γίνεται μια συνοπτική ιστορική αναδρομή στα γεγονότα που οδήγησαν στην μορφή του IPTV όπως την ξέρουμε σήμερα. Έπειτα συγκρίνεται το IPTV με το γνωστό μας Internet TV. Στην συνέχεια γίνεται μια γενική περιγραφή ενός δικτύου IPTV ενώ έπειτα εμβαθύνουμε περισσότερο καθώς περιγράφονται και τεχνικές λεπτομέρειες για ένα τέτοιο δίκτυο. Ακολούθως περιγράφονται οι κωδικοποιήσεις που πραγματοποιούνται αλλά και οι διάφορές τους. Επιπλέον γίνεται ιδιαίτερη αναφορά και ανάλυση στα διάφορα είδη των αποκωδικοποιητών (Set-Top Box) που χρησιμοποιούνται και επισημαίνονται οι διαφορές που έχουν στη δομή και στα χαρακτηριστικά τους. Τέλος γίνεται μια αναφορά στους παρόχους πακέτων IPTV στην Ελλάδα ενώ γίνεται και μια σύγκριση αυτών των πακέτων μεταξύ τους. / The theme of this particular thesis is the study of the digital television via Internet protocol, also known as IPTV (Internet Protocol TeleVision) with special focusing on the decoder which is used in order to achieve television broadcasting. This decoder is called Set-Top Box. Essentially, IPTV is the transmission of television signals over broadband which is using IP protocol through a closed private network and not the public Internet. IPTV is considered to be the present and the future regarding the types of television because the user has the ability to access TV channels with digital view, while the ability provided by on-demand services about watching every type of television content at every time the user wants makes the whole “package” much more attractive. Particularly, in this thesis, is firstly presented the definition of networking TV and generally of all these things which have contributed to the creation of IPTV. Following is a brief historical background to the events that led to the form of IPTV as we know it today. Afterwards, the IPTV is compared to the Internet TV, which is familiar to us. After that, a general description of an IPTV network is taking place and then we go further as technical details of such a network are described. Moreover, the encodings performed and their differences are mentioned. Additionally, there is much reporting and analysis in various types of decoders (Set-Top Box) used and marked the differences they have on their structure and their profile. Finally, there is a reference to IPTV packet providers in Greece and is happening a comparison among these packets.