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RALI FX3 Microwave Fixed Services Frequency Coordination. Glenn Odlum Senior Engineer Spectrum Engineering Section [email protected] FX3 - Key Points. Point-to-Point and Point-to-Multipoint Fixed Links in 1 - 60 GHz Line-of-Sight systems only Analogue and Digital Systems

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rali fx3 microwave fixed services frequency coordination
RALI FX3Microwave Fixed ServicesFrequency Coordination

Glenn Odlum

Senior Engineer

Spectrum Engineering Section

[email protected]

fx3 key points
FX3 - Key Points
  • Point-to-Point and Point-to-Multipoint Fixed Links in 1 - 60 GHz
  • Line-of-Sight systems only
  • Analogue and Digital Systems
  • Technical Policy - Planning Rules
  • Frequency Coordination Procedures
  • Not a Link Planning Tool



-Spectrum Plan

-ITU Radio Regulations

-ITU-R Recommendations

-Sharing Requirements

-Spectrum Planning Reports

-Industry Consultation


-Channel Plans

-Planning Rules

-Coordination Rules

input spectrum plan
Input - Spectrum Plan
  • The Australian Radiofrequency Spectrum Plan identifies which radiocommunications services may operate in which frequency band
  • Can’t issue a licence contrary to the Spectrum Plan
  • Spectrum Plan may identify a frequency band for fixed service use but FX3 may not have an entry for it
input itu radio regulations
Input - ITU Radio Regulations
  • Sets many aspects of fixed services
  • Article S5 - Frequency allocations by region
  • Article S15 - Interference
  • Article S21 - maximum eirp of fixed service transmitter in direction of a GSO satellite
input itu r recommendations
Input - ITU-R Recommendations
  • F- series (Fixed Service)
    • Radiofrequency channel arrangements
    • Error performance and availability objectives
    • Protection criteria (protection from other services)
    • Characteristics of fixed services to facilitate sharing with other services
    • Many others
input itu r recommendations1
Input - ITU-R Recommendations
  • Other Series
    • IS series - Inter-service sharing and compatibility
    • P series - Radiowave propagation
    • SF series - frequency sharing between the fixed-satellite service and fixed service
    • SM series - Spectrum management
input sharing requirements
Input - Sharing Requirements
  • In some bands fixed services are required to share spectrum with other services such as the mobile service, space service, fixed satellite service, or mobile satellite service.
  • Sharing may impose restrictions on the fixed service and/or other services
  • Increasing demand for fixed service to share with other services
input industry consultation
Input - Industry Consultation
  • Vital part of policy development
  • Objective is reach agreement on how to make best use of a band
  • Total agreement not always possible
  • ACMA has a very good working relationship with most sectors of the industry
output channel plan
Output - Channel Plan
  • Usually based on ITU-R recommendations
  • Takes account of what type of use is supported (wide-band analogue, FM-FDM, low, medium or high capacity digital)
  • Main and interleaf pattern
  • Centre frequency and channel width
  • Transmit / receive duplex spacing
output planning rules
Output - Planning Rules
  • Expresses many policy requirements
  • Consists of Assignment Instructions and Assignment Restrictions on a per band basis and Section 3
  • Some flexibility is available on a case-by-case basis
  • Planning rules are reviewed from time-to- time
output assignment instructions
Output - Assignment Instructions
  • Specific to each band
  • Typical use
  • Assignment priority
  • Minimum path length
  • Antenna Requirements
  • Notes
Antenna Requirements

: Refer to Appendix 11

output assignment restrictions
Output - Assignment Restrictions
  • Identifies constraints placed on assignments
  • Could be channel or geographic location specific
  • May express additional coordination requirements
  • May require application of special conditions or advisory notes to licences
output protection ratio
Output - Protection Ratio
  • Sets minimum ratio of wanted signal to unwanted signal (W/U)
  • Sets the maximum level of unwanted (interference) signal level
  • Minimum C/I for victim link BER
  • Allowable BER degradation
  • Fade margin (multi-path or rain) required on wanted link (outage time)
  • NOTE Protection Ratios in FX3 are default values - real performance parameters of equipment can be used
frequency coordination
Frequency Coordination
  • Determines the compatibility of a proposed new fixed link service with existing services operating on a particular channel frequency in a given geographic area
  • Focus is on the wanted signal to unwanted signal ratio (protection ratio)
required data
Required Data
  • Preferred frequency band
  • Geographic coordinates of link ends
  • System type / capacity / emission details
  • Nominal mean emission power
  • Antenna type and characteristics
coordination problem








Coordination Problem

A B - Existing service route

C D - Proposed service route

A D and C B - Interference path

basic coordination steps
Basic Coordination Steps
  • Identify potentially affected existing fixed services
  • Calculate wanted and unwanted (interference) levels to / from proposed and existing fixed services
  • Compare levels against the interference management criteria (protection ratio)
  • Check compliance with assignment instructions and policy requirements
  • Check compliance with sharing requirements for other services