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State of the Debate on Interference: Technical Position Paper on Potential Mitigation Solutions and Future Standardization Work


01 Jul 2010



June 2010

This paper serves as a discussion document for the debate on the potential interference by mobile Electronic Communications Networks (ECN) deployed in the 800 MHz band affecting integrated broadband cable and television networks (HFC). It represents the cable industry’s views of the current state of the debate on LTE interference and seeks to clarify a number of technical facts regarding the technologies deployed by the cable industry. It also reviews proposals for potential mitigation solutions and presents a position for a way forward in efforts to increase the co-existence of both new and existing services in the 800MHz band.

While there are references to solutions for the cable industry to explore, it is our belief that any potential solutions be considered in a wider context where progress be made with a holistic view of all actors in the ICT community with a view to coexistence. Efficient use of spectrum is only possible if the facts regarding the cable industry and their relation to the wider debate are clarified. Coexistence in the 800MHz band represents the most efficient use of a band currently enjoyed by millions of cable customers relying on broadband, tv and telephony.

Cable’s role in Europe is important when considering that cable already delivers high speed broadband services that surpass the Digital Agenda’s speed goals. The cable industry already provides +100Mbps across a growing European footprint of DOCSIS 3.0-enabled networks. Our position as challenger to incumbent operators brings the benefits of competition to the European consumer. In the markets where cable invests in its networks, incumbents are spurred into responding with further network investments. All of this benefits Europe, its economy and its citizens.

We continue to invest in the 800MHz band to bring tangible consumer benefits by providing high speed broadband and interactive TV services including HD and VOD. The need for continued bandwidth is not unique to any one market player offering broadband or TV services. As first mover in the fixed line broadband market with an independent infrastructure to the incumbent, we also help to drive the market penetration through competitive pricing.

Our operators are committed to the efficient use of spectrum to the maximum extent. We achieve that through coexistence of mobile and cable services to the benefit of end users; for both networks physical limitations in the separation of signals for their undisturbed transmission have to be considered. To accomplish this demanding task the cable operator needs more spectrum than in the past.

To ensure bridging the digital divide in the rural area while maintaining the diversity of high power broadband fixed line infrastructure, a differentiated approach for rural and urban area has to be made that recognizes the role of a mix of technologies – not a focus on one to the detriment of others.



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