IPTV QoS/QoE

This paper discusses a concept of predicting interactions between measurable (technical) parameters of telecommunications network – QoS (Quality of Service) and QoE (Quality of Experience) of the video under realistic triple play network conditions using IPTV (Internet Protocol TV). Here is represented a simulation method using OPNET as simulation tool that includes a complete scenario of IPTV channels distributio in the hypothetical IP / MPLS network. Based on simulation results of the QoS parameters in the network and using of certain well-known regression analysis of QoS/QoE correlation model it is possible to evaluate the quality of the received video perceived by the user. It performs the mapping between quality assessment VQR (Video Quality Ratings), VQM (Video Quality Metric) and DMOS (Difference Mean Opinion Score) subjective rating scales. In that way it performs validation of IPTV service in terms of comparing the original video and the received video by the end user. The aim of this paper is to demonstrate the possibility of video quality validation under laboratory conditions using simulation method.

this paper compares the values of the indicators of data link layer QoS (Quality of Service) of several access lines, which can serve as a measure of the quality of the physical link or QoPh (Quality of Physical Layer), in real environment without reference video signal (No Reference), during the delivering of IPTV (Internet Protocol Television) multicast services to multiple users. It also focuses on the fact that an increase in channel capacity reduces the number of indications of signal degradations in data link layer, because it increases the resistance of useful information on the interference. The paper proves the fact that at the same time, improving the physical layer conditions, the values of indicator of network QoS such as packet loss or delay is reduced which affects the final grade at the end-user QoE (Quality of Experience) of IPTV (Internet Protocol Television) services.

Internet Protocol Television (IPTV) and Voice over Internet Protocol (VoIP) have gained unprecedented growth rates in the past few years. Data rate and high coverage area of IEEE 802.11n motivate the concept of combined IPTV and VoIP over IEEE 802.11n. Transmission of combined IPTV and VoIP over a wireless network is a challenging task. In this paper, we deal with the capacity evaluation of combined IPTV and VoIP over IEEE 802.11n. We evaluate the use of Datagram Congestion Control Protocol (DCCP) at transport layer of IPTV and VoIP. Our study shows that DCCP can enhance capacity of IPTV by 25%. Our study confirms that performance of DCCP deteriorates severely in presence of any other UDP flow because of congestion-less mechanism of UDP. Our fairness analysis with TCP traffic shows that IPTV and VoIP using DCCP provides fair share in bandwidth to TCP with 19% increase in combined capacity. We study the effect of IEEE 802.11n parameters and obtain optimal values. We show the optimal values and trends of Access Point (AP) parameters including Queue size, Transmission Opportunity, Aggregation and Block ACK etc. Our study shows that nearly 9 more VoIP users are supported with a queue size of 70 packets and transmission opportunity of 9. Our study concludes that selection of DCCP and optimized parameters over IEEE 802.11n can enhance the capacity of IPTV and VoIP by atleast 25% and 19% respectively as compared to the use of UDP.