Frequency coordination
Encyclopedia
Frequency Coordination is a technical and regulatory process which is intended to remove or mitigate radio-frequency interference
between different radio systems which utilize the same operational frequency
.
Normally frequency coordination is undertaken by "administrations" (i.e. national governmental spectrum regulators) as part of a formal regulatory process under the procedures of the Radio Regulations
(an intergovernmental treaty text regulating the use and sharing of the radio frequency spectrum.
Before an “administration” allows an operator to commence operation of a new radiocommunications network it must in principle undergo coordination. This involves the following steps:
Coordination thus ensures:
Coordination is thus closely bound to "date of protection" or "priority", defined by the date on which complete coordination data is received by the ITU. New planned networks must coordinate with all networks with an earlier “date of protection” but are protected against all networks with a later "date of protection". Planned (but not implemented) networks acquire status under this procedure but time limits ensure that protection is not for ever if networks are not implemented.
Congress Authorizes FCC
In 1982, Congress also provided the FCC with the authority to use frequency coordinators:
AASHTO *
APCO *
FCCA *
IMSA *
For Business and special emergency -
AAA *
AAR *
EWA *
FIT *
UTC *
Co-channel interference
Co-channel interference or CCI is crosstalk from two different radio transmitters using the same frequency. There can be several causes of co-channel radio interference; four examples are listed here....
between different radio systems which utilize the same operational frequency
Frequency
Frequency is the number of occurrences of a repeating event per unit time. It is also referred to as temporal frequency.The period is the duration of one cycle in a repeating event, so the period is the reciprocal of the frequency...
.
Normally frequency coordination is undertaken by "administrations" (i.e. national governmental spectrum regulators) as part of a formal regulatory process under the procedures of the Radio Regulations
Radio Regulations
The Radio Regulations is an intergovernmental treaty text of the International Telecommunication Union , the Geneva-based specialised agency of the United Nations which coordinates and standardises the operation of telecommunication networks and services and advances the development of...
(an intergovernmental treaty text regulating the use and sharing of the radio frequency spectrum.
Before an “administration” allows an operator to commence operation of a new radiocommunications network it must in principle undergo coordination. This involves the following steps:
- Inform other operators about the plans
- Receive comments if appropriate
- Conduct technical discussions with priority networks
- Agree technical and operational parameters
- Gain international recognition and protection on the Master International Frequency RegisterMaster International Frequency RegisterThe Master International Frequency Register is the formal database of satellite and terrestrial frequency assignments maintained by the International Telecommunication Union . Recording in the MIFR is the final stage of the frequency coordination process, and confers international recognition...
- Bring the network into use
Coordination thus ensures:
- All administrations know the technical plans of other administrations
- All operators (satellite and terrestrial) have the opportunity to determine if unacceptable interference is likely to be caused to their existing and planned “priority” networks
- An opportunity to object
- An opportunity to discuss and review
- An opportunity to reach technical and operational sharing agreements
Coordination is thus closely bound to "date of protection" or "priority", defined by the date on which complete coordination data is received by the ITU. New planned networks must coordinate with all networks with an earlier “date of protection” but are protected against all networks with a later "date of protection". Planned (but not implemented) networks acquire status under this procedure but time limits ensure that protection is not for ever if networks are not implemented.
Congress Authorizes FCC
In 1982, Congress also provided the FCC with the authority to use frequency coordinators:
- Assist in developing and managing spectrum.
- Recommend appropriate frequencies (designated under Part 90)
List of Coordinators
For Public Safety frequency coordination -AASHTO *
APCO *
FCCA *
IMSA *
For Business and special emergency -
AAA *
AAR *
EWA *
FIT *
UTC *