Frequency Reuse Parameter

The Frequency Reuse parameter allows operators to define which APs are co-located (or within radio range) with other APs. This definition results in an automatic radio network modification such that self-interference is reduced amongst the co-located sectors.

A network in which two frequencies “F1” and “F2” are reused throughout the deployment as shown right.

The set of APs to configure the Frequency Reuse option on is dependent on the GPS synchronization sources in the whole network, CMM3, CMM4 or “onboard GPS” (GUI options are: GPS or CMM).

The GPS sync source is the same on all APs or is a combination of “onboard GPS” and CMM4

In this configuration the GPS synchronization source in the whole network is one of the following:

  • “onboard GPS” or
  • CMM4 or
  • CMM3 or
  • Mix of “onboard GPS” and CMM4 (but NOT CMM3)

For examples of how to configure Frequency Reuse to ensure that interference is reduced throughout the deployment, see figure right.

The rules in selecting the APs to enabling the Frequency Reuse in this deployment are:

  • Only ONE of the APs on the same tower configured with the same frequency must be configured with the Frequency Reuse parameter set to Back Sector; the other AP must be configured with Frequency Reuse set to Front Sector.  Also, APs on different towers facing each other with overlapped coverage must be configured with Frequency Reuse set to Back Sector.

 

The GPS sync source is a mixture of all types (CMM3, CMM4 & “onboard GPS”)

In this configuration the GPS sync source in the whole network is one of the following:

  • (CMM3 and “onboard GPS”) or
  • (CMM3 and CMM4) or
  • (CMM3 and CMM4 and “onboard GPS”)

For more examples of which APs to enable the Frequency Reuse feature in this mixture of sync sources, see figures right.

The rules in selecting the APs to configure Frequency Reuse to Front Sector or Back Sector in a mixture of sync sources deployments are:

  • Only ONE of the APs on the same tower configured with the same frequency must have Frequency Reuse set to Back Sector if the sync source of both APs is the same or the sync is a combination of “onboard GPS” and CMM4; the other AP will be configured with Frequency Reuse set to Front Sector
  • For the APs on different towers facing each other with overlapped coverage:
    1. If both APs have the same sync source then only ONE of them must have Frequency Reuse set to Back Sector; the other AP shall be configured with Frequency Reuse set to Front Sector
    2. If one AP has “onboard GPS” as sync source and the other one has CMM4 then only ONE of them must have Frequency Reuse set to Back Sector; the other AP shall have Frequency Reuse set to Front Sector
    3. If one AP has “onboard GPS” or CMM4 as sync source and the other one has CMM3 then:
      1. If the AP with CMM3 sync source has Frequency Reuse set to Back Sector, then the other AP (with “onboard GPS” or CMM4 sync source) must have the Frequency Reuse set to Back Sector
      2. If the AP with CMM3 sync source has Frequency Reuse set to Off, then the other AP (with “onboard GPS” or CMM4 sync source) must have Frequency Reuse set to Off.
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