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DoD Interim Report Technical Feasibility of Accommodating IMT-2000 Within the 1755-1850 MHz Band

STUDY CONTEXT. Directed by the President Multiple Bands Under Consideration in U.S. 806 - 960 MHz; 1710 - 1885 MHz; 2500 - 2690 MHz DoD focus is 1755-1850 MHz Provide the Use, Cost and Operational Impacts and Trade-offs Scrutinized by NTIA, OMB and FCC Released to the Public.

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DoD Interim Report Technical Feasibility of Accommodating IMT-2000 Within the 1755-1850 MHz Band

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    1. DoD Interim Report Technical Feasibility of Accommodating IMT-2000 Within the 1755-1850 MHz Band Mike Williams Joint Spectrum Center Senior Engineer 1 December 2000 (410) 293-2681 williamsm@jsc.mil

    2. STUDY CONTEXT

    3. DOD IMT-2000 STUDY PLAN STRUCTURE

    4. DoD IMT-2000 WORKING GROUPS

    5. STUDY PURPOSE

    6. TECHNICAL APPROACH Identify major incumbent DoD systems Identify principal DoD analysis factors Tech parameters, including interference thresholds Operational scenarios Determine IMT-2000 analysis factors Perform 2-way interference analysis for different sharing/segmentation options Assess results

    7. MAJOR DOD SYSTEMS OPERATING IN 1755 - 1850 MHz

    8. TECHNICAL APPROACH INTERFERENCE ANALYSIS Antenna coupling Mainbeam-to-mainbeam, mainbeam-to-sidelobe Path loss Terrain dependent for fixed, known locations Smooth earth mode for transportables, mobiles Considered frequency dependent rejection Many-to-one for aggregate IMT-2000 envir To spaceborne, airborne receivers One-to-one for terrestrial situations Separation distance to prevent interference

    9. SUMMARY OF INTERIM RESULTS Full band sharing appears very difficult Substantial separation distances required for co-tuned operation Over 100 km for terrestrial systems Over 400 km for airborne systems SGLS receivers may be degraded by 2006 Segmentation plans will require access to additional spectrum in a comparable band Loss of channels for radios and control links Loss of links for ACTS, SGLS Vacating band will require replacement spectrum

    10. MITIGATION CONSIDERATIONS Examine possible mitigation options - DoD Antenna relocation, shrouding, radiation fences Sharing of event scheduling Limitations on training locations and operations Must maintain full operational capability Examine possible mitigation options - IMT Selected antenna orientations “Listen-before-transmit” capability Dynamic, event-dependent frequency management

    11. REMAINING EFFORTS Gather and characterize operational impacts for each option Determine cost impacts associated with sharing/vacating Complete technical assessments including other systems Consolidate final report Technical, operational, cost Coordinate final report within DoD

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