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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