Table 4-6: Dfs Behavior On Rbs Using Etsi Based Country Codes - Alvarion BreezeNET B System Manual

Chapter 4 - Operation
While associated, the RB also performs In-Service Monitoring, meaning that it
periodically scans the operating channel for radar signals. If radar is detected, it
will notify the BU and stop transmitting on the respective frequency.
ETSI requirements enforce particular implementations for the DFS functionality
on RBs. Implementations of DFS on the RB for ETSI 5.8 and ETSI 5.4 based
country codes are compared in

Table 4-6: DFS behavior on RBs using ETSI based country codes

Feature
Applicable country
codes
Startup
Operating Frequency
Radar Detected or
Adjacent to Radar
frequency
Radar Free frequency
4.2.6.2.3.2.3 Channel shutdown
Before ceasing transmission on the frequency where radar signals had been
detected, the BU sends a special disassociation message to its associated RB. This
message includes an indication whether the RB should wait for this BU. If the RB
should wait, the message includes also the waiting time. During this time each RB
searches for the BU in the defined frequencies subset. If the BU was not found
within the waiting time, or if a waiting request was not included in the message,
the RB starts searching for any BU, using the Best BU mechanism if applicable.
Typically, operators prefer to preserve the original frequency planning and to
avoid moving to a new channel unless they are sure that there is a continuous
radar activity in the original channel. It should be noted that detection of radar
activity does not necessarily indicate a continuous radar activity in the channel. A
BreezeNET B
ETSI 5.8 based country codes
 ETSI 5.8

Other country codes based on ETSI 5.8
(UK 5.8, Germany 5.8 and Universal
5.8 with Detection Algorithm set to
ETSI)
RB checks each frequencyand tags it as
either Radar Free or Radar Detected.
RB performs In-Service Monitoring and
dissasociates when radar is detected.
Expires after a predefined Channel
Avoidance Period. The frequency's status
is then set to Radar Free, but the RB needs
to check for radar before using it to
associate.
Expires. Afterward, the frequency is still
tagged as Radar Free, but the RB needs to
check for radar before using it to associate.
Table 4-6.
ETSI 5.4 based country codes
 ETSI 5.4

Other country codes based on ETSI 5.4
(ETSI F 5.4 and Universal 5.4 with
Detection Algorithm set to ETSI)
All frequencies are tagged as Radar Free
by default
RB performs In-Service Monitoring and
dissasociates when radar is detected.
Expires after a predefined Channel
Avoidance Period. The frequency's status
is then set to Radar Free, but the RB needs
to check for radar before using it to
associate.
No revalidation required. The RB may use
the frequency to associate at any time.
103
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