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Disclaimer

This technical study ("Technical Study") has been prepared by Ofcom, in connection with the award of wireless telegraphy licences to use the three spectrum bands at 2500-2690 MHz, 2010MHz -2025MHz and 2290-2300MHz (the “Spectrum Bands”). It is referred to in the Consultation Document on Ofcom’s proposals for the grant of wireless telegraphy licences to use the Spectrum Bands and the method for their allocation

This Technical Study is intended for information purposes only. This Technical Study is not intended to form any part of the basis of any investment decision or other evaluation or any decision to participate in the award process for the Spectrum Bands, and should not be considered as a recommendation by Ofcom or its advisers to any recipient of this Technical Study to participate in the award process for the Spectrum Bands. Each recipient of this Technical Study must make its own independent assessment of the potential value of a licence after making such investigation as it may deem necessary in order to determine whether to participate in the award process for the Spectrum Bands. All information contained in this Technical Study is subject to updating and amendment.

The content of the Technical Study, or any other communication by or on behalf of Ofcom or any of its advisers, should not be construed as technical, financial, legal, tax or any other advice or recommendation. Accordingly, any person considering participating in the award process for the Spectrum Bands (either directly or by investing in another enterprise) should consult its own advisers as to these and other matters or in respect of any other assignment of any radio spectrum.

Introduction

This report is divided into three sections:

• Compatibility concerning interference from services in other bands into the award band
• Compatibility issues for interference generated in the award band that may affect services in other bands.
• In-band compatibility issues.

For each section Ofcom has modelled a range of scenarios that we believe represent realistic deployments of the systems concerned, using simulation parameters agreed by industry for such purposes.

We have assumed that deployments in the 2500 – 2690 MHz award band will be UMTS FDD, UMTS TDD or mobile WiMAX (802.16e), because we think these are the most likely technologies that would be deployed, but recognise that other technology types could be used.

Our results do not attempt to analyse in detail the impacts on each technology, instead we have looked at where agreed interference limits could be breached by interfering systems in neighbouring bands or neighbouring countries.

The following diagram shows the channel numbering used for the 2500 – 2690 MHz band. Our analysis focuses on channels 30 and 38, 2645-2650MHz and 2685-2690MHz respectively. (The TDD/FDD split is for illustrative purposes only.)

Channel numbering for the 2500 – 2690 MHz band

The full document is available below:

• Technical Study - 2010-2025MHz, 2290-2302MHz and 2500-2690MHz Spectrum Awards - Adjacent and In-Band Compatibility Assessment for 2500-2690MHz [pdf]
  Full print version of the technical study by Ofcom published: 11|12|2006

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