| With the development of full-services and Internet, the requirement of users for the multimedia applications such as IPTV, HDTV and VoD is also daily increasing. At the same time, as the quad-play services (voice, video, Internet and wireless) push the communication technologies ahead rapidly, the users require the network can provide full-covering, mobility and flexibility. It is necessary for the integrated broadband network to meet the various requirements of the users. However, considering the diversity of the requirements, the complex of the access environment, and the contradiction of the bandwidth and transmission distance in the wireless network, the integration of the optical and wireless is proposed for their complementation with each other. Moreover, the intelligence of the whole network including the service layer and the edge of network makes it necessary to enhance the management and control of the access network.A combination of optical and wireless network can be an attractive solution to the broadband access network. Therefore, an integrated architecture based on the Ethernet PON and Wireless LAN (802.11) is proposed, which takes the advantage of the two networks and reduces the CAPEX and OPEX. Based on the integration of optical and wireless, we have researched on the intelligent management and control technologies in the wireless-optical broadband access network. It mainly includes the schemes of service handoff, survivability and energy saving. Some innovative results have been proposed as following:1. A novel integrated architecture based on the EPON and WLAN has been proposed. And this thesis elaborated the characteristic, key-technologies, networking technologies and future applications of the proposed architecture. This architecture implements the information interaction and funaction cooperation between the optical network and wireless network. It can provide the service intelligently and manage the network dynamically to guarantee the diversity of service and optimize the utilization of the network resource.2. Considering the user-centric services, a service handoff scheme based on the user location management and dynamical resource allocation has been proposed. It includes two respects:an environment-aware localization scheme for the user location management and a service handoff scheme based on the middleware. With the complexity of the network, an environment-aware and range-free localization algorithm was proposed to overcome the irregular transmission of the wireless signal. It can reduce the localization error and have higher localization accuracy compared to DV-Hop and CDL. In addition, to implement the service handoff automatically and allocate the network resource dynamically, a middleware has been designed and developed to support the users’mobility in the integrated network. The goal of the middleware is to keep users’logical service environment despite changes in the physical environment, so it can guarantee the diversity of service and optimize the utilization of the network resource.3. Considering the survivability and fault management, a wireless protection scheme based on the mesh technology has been proposed. According to the information of network topology, available resource and service deployment, it setups the point-to-point wireless link to reroute the affected traffic of the failed ONU with the help of the ad-hoc architecture in the mesh network. And an ONU with wireless and protection function was also proposed to meet the requirement of mobility and flexibility. The problems about fault detection, protection switch, and bandwidth adjustment have been discussed in detail. Furthermore, a QoS-aware dynamic resource allocation scheme for the video service was especially proposed to guarantee the QoS of users.4. Based on the discussion in the ITU-T and IEEE standardization, a sleep and periodical wake-up scheme has been proposed to reduce the energy consumption in the ONUs. The OLT intensively monitors and controls the work state of the ONUs. The messages of REPORT and GATE were utilized to implement the sleeping scheme in the ONUs. Furthermore, with the hierarchical access architecture, the integrated network reduces the power-consumption through traffic aggregation and energy-aware routing algorithm to put low-load ONUs into sleep. Experimental results show that the proposed energy saving scheme can reduce the power consumption by at least40%. |
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