Ethernet Passive Optical Network (epon)

Ethernet Passive Optical Network (EPON) is a point to multipoint network architecture and suitable for carrying Internet Protocol Television (IPTV) service because it provisions higher bandwidth for downstream, but it also cannot satisfy the bandwidth requirement of tens of thousands of IPTV channels and carry these channels simultaneously. Previous papers had proposed some multicast mechanisms to carry IPTV over EPON carry, but an effective admission control is required to determine which IPTV channel request has to be admitted to transmit over EPON, to efficiently promote bandwidth usage of EPON and satisfy most user’s requirements for IPTV channels. This paper proposes a popular channel first (PCF) admission control (AC) algorithm for determining IPTV channel transmission admission over EPON. As a result, the simulation result of the proposed method shows that the algorithm can improve the bandwidth utilization and can satisfy more IPTV channel requests, and achieve a more scalable IPTV service network and satisfy most user’s channel requirements. Introduction The evolution of technologies in access network are expediting much quicker in the recent year, such as DSL (Digital Subscriber Line), Wireless Network (WiFi and WiMAX), Cable Network (Hybrid Fiber Coaxial, HFC) and Ethernet Passive Optical Network (EPON) [1-3]. The downlink and uplink bandwidth increase dramatically. Thus, more and more bandwidth-intensive applications are emerging, such as Voice over IP (VoIP), video-conferencing, interactive gaming and IPTV (Internet Protocol Television) [4]. EPON is considered as the best candidate for the next generation access network technologies in the access technologies. IPTV is considered as the killer application in the new emerging bandwidth-intensive applications. Thus if one can combine the EPON and the IPTV successfully, one will get the benefits. In the following parts, this paper will introduce the IPTV, EPON and the difficulty of deploying IPTV over EPON. IPTV uses Internet Protocol (IP) to transmit the Television (TV) to end users. The essential properties of the IPTV are (1) Interactive: end users can use the IP network to interactive with the service provider. (2) Multicast [5]: channels are transmitted to the specific group and end users use Internet Group Management Protocol (IGMP) join/leave messages [6] to receive/reject the group. (3) Locally/Private: IPTV is usually deployed in private network. (4) Bandwidthintensive: per HDTV (High-definition TV) digital stream (MPEG-2 compressed) requires 12-18 Mbps, and per SDTV (Standard-definition TV) digital stream (MPEG-2 compressed) requires 3-8 Mbps [15]. Thus, to deploy IPTV well, it must need the access network with high downlink bandwidth, such as EPON (1Gbps downlink bandwidth).