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モバイルバックホールの光パケット伝送の将来性The Future of Packet-Optical Transport for Mobile Backhaul
目次
Even casual observers recognize that mobility is what's driving the telecom industry today. More specifically, the driving force is mobile broadband – using high-speed mobile connections for packetized data and multimedia applications. Pyramid Research forecasts that the number of mobile broadband connections worldwide will reach 1 billion during 2012. The excerpt below breaks out the mobile broadband connection forecast by 3G and 4G technology types.
High Speed Packet Access (HSPA) is expected to overtake Evolution-Data Optimized (EVDO) as the dominant mobile broadband technology by the end of this year, a significant occurrence given the high bandwidth of HSPA-based services compared to EVDO-based services. In short, mobile broadband connections are set to increase dramatically, along with the bandwidth per connection. As a result, mobile broadband traffic is set to boom over the next five years at rates three times the rate of wireline traffic. Heavy Reading divides the optical opportunity for packet backhaul into three network segments: access, edge/aggregation, and metro core. The access network will be dominated by lower-capacity access P-OTS equipment that sits at the cell tower and feeds traffic into aggregation sites. We see midrange-capacity P-OTS sitting at edge/aggregation sites, collecting traffic from cell sites. The excerpt below shows Heavy Reading's global forecast for P-OTS for mobile backhaul applications, broken out by network segment.  Report Scope and Structure Report Scope and Structure Backhaul Evolution Strategies for LTE Operators is structured as follows: Section I includes a full executive summary and report key findings. Section II provides a summary of the slow rate of progress in transitioning to packet backhaul among cellular operators throughout the world to date. It depicts deployments by architecture and by technology while also examining the reasons for the slow rate of adoption up until now. Section III considers the upcoming challenges of the LTE architecture in the context of broader "IP transformation" strategies being implemented by carriers worldwide. It depicts the changes in the logical architecture from 3G to LTE, as well as the objectives driving those changes. It also addresses some of the background context against which operators are evolving their packet backhaul networks from being optimized for 3G to being optimized for 3G and LTE. The evolving nature of cell site planning, the role of voice services in LTE, and the support of transport features in the eNodeBs are considered. Section IV analyzes the interface, topology, and protocol options for LTE backhaul. It weighs the options for operators in migrating from 3G's largely point-to-point backhaul connectivity model to LTE's many-to-many connectivity model. It examines operators' initial planning assumptions for the new S1 and X2 interfaces and scenarios in which the balance of traffic that flows across these interfaces could potentially change over time. It also describes the different choices that operators are making in terms of topology and supporting network protocols. Section V considers the greater exposure of the LTE network to security breaches resulting from the new, flatter architecture. It explores options for mitigating the risk with tighter physical security as well as different implementation models associated with deploying IPsec in the backhaul. Section VI looks at how the potential synchronization requirements change with LTE, depending on whether it is launched in TDD or FDD spectrum. Particular emphasis is placed on the challenges faced by operators deploying in FDD spectrum and picking a path through the variety of options available to them to support phase synchronization over time should they need to. Section VII looks at the ways in which the implication of a "collapse" in the transport and core domains, as provided for by 3GPP, is likely to play out in the commercial environment. Drivers and barriers associated with operators implementing this approach are considered, along with a discussion of the most likely candidate features for distribution out from the core to the edge. Section VIII profiles the LTE backhaul strategy of Verizon Wireless, which is likely to be the world's leader in rolling out LTE. The operator's approach to supporting all its 2G, 3G and upcoming LTE traffic across its new packet backhaul network are described together with specifics on how it plans to support features which are particularly to the LTE requirements. Section IX provides short profiles of the primary vendors in the backhaul equipment space, how they are evolving their portfolios to meet the new LTE requirements, and what successes they are able to point to for the early phases of LTE rollout. The report is essential reading for a wide range of industry participants, including the following:
Table of Contents I. INTRODUCTION & KEY FINDINGS
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