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Method for Guaranteeing Survivability in Wireless Optical Networks Disclosure Number: IPCOM000198567D
Publication Date: 2010-Aug-09
Document File: 9 page(s) / 4M

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Method for Guaranteeing Survivability in Wireless Optical Networks

Silvia Pato, João Pedro, Pedro R. M. Inácio, João M. L. Santos, Artur Arsénio, Paulo Monteiro

This publication applies to the area of telecommuni- cations, specifically to cost-effective survivability to failures in a Distributed Antenna Systems (DAS) sup- ported over an optical fiber infrastructure, such as a point-to-multipoint Passive Optical Network (PON) or Next-Generation Optical Access (NGOA) physical ar- chitecture. The solution may be applied to scenarios based on the digital or analog transmission of signals from the remote terminals to the central office, and through different mobile access technologies.

In the described approach it is considered that DAS- compliance is provided by offering physical connectiv- ity for different radio systems between a central pro- cessing unit and a group of remote antennas within a fiber-optical network. Particularly, the proposed solu- tion is mainly concerned with optical layer and anten- na configuration procedures, abstaining itself from the upper layer algorithms and radio technologies. Hence, it requires basic knowledge about dynamic antennas, in the sense that the positioning of the antenna may be subjected to modification during its operation, and also some PON and NGOA background, mostly about

the fundaments of optical transmission and multiplex- ing over both architectures.

The following section will explain some of the con- cepts regarding the problem addressed by this publi- cation. Such description does not aim to be exhaustive, only to provide the sufficient information to correctly understand the proposed solution.

The main goal of the information society is to provide broadband services to everyone. Reaching such goal has been often promised through the deployment of optical fiber in the form of Fiber-to-the-Curb (FTTC) and Fiber-to-the-Home (FTTH) implementations. However, the impact of wireless telephony and wire- less LANs in society has been of such magnitude that the liberation of a wired connection created in the end user a sense of autonomy that he/she is compelled to preserve. In fact, being able to benefit from the high capacities envisioned for next-generation fixed access networks, while keeping the abovementioned au- tonomy, would certainly represent the most desirable scenario from an end user point of view. This is one

Figure 1: Proposed network architecture



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of the objectives addressed by the International Mo- bile Telecommunications Advanced (IMT-A) systems, which go beyond the capabilities of IMT-2000. In par- ticular, it specifies data rates of up to 1 Gb/s for low mobility users (e.g. pedestrians) and up to 100 Mb/s for high mobility users

Future wireless systems, namely the ones targeting the demanding IMT-A objectives, may...