Therefore, placement of ONU is very important in FiWi. By adding such criterion in ONU we can save energy in FiWi network.Īs mentioned earlier ONU works as an interpreter between both PON and WMN technology. If an ONU has low traffic then it transfers its traffic to other ONUs and goes into sleeping mode and if traffic increases then ONU comes into awakening mode. Due to increasing concern in global warming, energy saving is the current issue in all the networks. This issue is directly related to network deployment cost. with fewer number of ONUs all wireless routers can communicate. ONU placement means how optimally network designer can place the ONUs in the network i.e. Mainly survivability is related to backend since it has tree topology. Survivability is defined as the ability to provide services to users if any failure occurs in the network. Survivability, ONU placement and energy saving are the key issues in FiWi network. In a reverse fashion the services are provided to the users. Finally OLT inject the packets into internet backbone. The ONU forwards this packet to OLT via feeder fiber, RN and distribution fiber. In FiWi, to access internet services packets are sent to primary ONU via wireless router. The optical signal to wireless signal and vice-versa is converted through ONU. The ONU and wireless gateway combined to work as an interpreter between two ends. PON has Optical Line Terminal (OLT), Remote Node (RN), Optical Network Unit (ONU) and fibers whereas WMN has wireless gateways, wireless routers and end-users. FiWi consist PON network at back-end whereas WMN network at frontend. The architecture of FiWi is shown in Fig. FiWi provides many advantages to users such as cost-effectiveness, higher bandwidth, better flexibility and reliability. Initially FiWi called as Hybrid optical/wireless broadband access network. Therefore, various researches are carried to integrate the technical merits of PON and WMN network to form Fiber-Wireless (FiWi) network1-5. The WMN network includes WiFi, WiMAX and cellular technology. The limitation of WMN is lower bandwidth and interference problem. Another technology, WMN provides services to user at lower cost with better flexibility, which is ideal for mobile users. Peer-review under responsibility of organizing committee of the International Conference on Information and Communication Technologies (ICICT 2014) doi:10.1016/j.procs.2015.01.055 This is an open access article under the CC BY-NC-ND license (). According to According to technique used PON may be categorized as TDM PON, WDM PON, Hybrid TDM/WDM PON and Also the PON suffers from limited connectivity due to requirement of physical channel to the end-users. PON provides higher bandwidth capacity to users but due to usage of optical devices the overall network cost increases. The existing networks such as Passive Optical Network (PON) and Wireless Mesh Network (WMN) provide broadband services to user. The user wants to access internet in Any where-Anytime fashion. In recent years, the increased number of internet users has created a demand of low cost and high bandwidth network. Keywords: Fiber-Wireless (FiWi) Passive Optical Network (PON) Wireless Mesh Network (WMN) ONU Placement. Peer-reviewunderresponsibility of organizing committee of the International Conference on Information and Communication Technologies(ICICT2014) Publishedby ElsevierB.V.This is an open access article under the CC BY-NC-ND license (). Hence, by using proposed algorithm we can make cost-efficient FiWi network. Simulation results show that proposed algorithm offers better solution for optimal placement of ONUs. Then we minimize the number of ONUs by ensuring that all the wireless routers are connected to at least one ONU. Initially we place ONUs in center region of each grid. The present work proposes a cost efficient algorithm for ONU placement. One of the key issues in FiWi network is ONU placement since it is related to network deployment cost. The FiWi network is a combination of optical backend and wireless front end. of Electronics and Telecommunication,Institute of Engineering and technology, Devi Ahilya University, Indore,452001,India Uma Rathore Bhatta*, Nitin Chouhana, Rakhsa UpadhyayaĪDept. International Conference on Information and Communication Technologies (ICICT 2014)Ĭost Efficient Algorithm for ONU Placement in Fiber-Wireless
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