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<div class="div">
<h1>Radio Network Supervision</h1>

<p>Radio network supervision provides the operator with information
about the functioning and usage of TCHs and SDCCHs in the BSC. This information
is related to mean holding times that are too long or too short, traffic channel
interference levels, channel failure rates, SDCCH and TCH congestion, and
BTSs without traffic transactions.</p>


<p>The information is available for the operator from the
alarm system of the BSC, which generates alarms according to the input from
the BSC call control.</p>


<p>The BSC supervises the TCH and SDCCH transactions by measuring
call duration and observing different events related to these transactions.
At the end of each measurement period, the BSC compares the values of different
counters, which have been stored in its BTS and channel-specific files to
the corresponding threshold values set by the operator.</p>


<p>All the parameters associated with radio network supervision
are BSC-specific and can be defined by the operator. These parameters define
the alarm thresholds and the length of the measurement periods for the different
supervisions. The supervisions are activated and deactivated by modifying
these threshold values and measurement period lengths.</p>


<p>Once the supervision has been activated, the supervision
is continuous from measurement period to another as long as the supervision
stays active. An exception to this is the supervision of BTSs with no transactions,
which has daily starting and stopping times.</p>


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<h2>Radio
Network supervision alarms</h2>

<p>Too short mean holding time (TCH)</p>


<p>This alarm is generated if the mean holding time for any
working TCH during a measurement period is shorter than the time period defined
by the operator.</p>


<p>Too long mean holding time (SDCCH, TCH)</p>


<p>This alarm is generated if the mean holding time for any
working SDCCH or TCH during a measurement period is longer than or equals
the time period defined by the operator.</p>


<p>Channel failure rate exceeded (SDCCH, TCH)</p>


<p>This alarm is generated if the percentage of abnormally
ended transactions on SDCCH channels or on TCH channels during a measurement
period is greater than or equals the alarm threshold defined by the operator.
There are separate alarm thresholds for the SDCCH failure rate and for the
TCH failure rate.</p>


<p>BTS channel congestion (SDCCH, TCH)</p>


<p>This alarm is generated if the percentage of the SDCCH
or TCH seizure requests refused due to congestion is greater than or equals
the alarm threshold defined by the operator. Separate thresholds for the SDCCH
and TCH congestion.</p>


<p>BTS with no transactions (SDCCH, TCH)</p>


<p>This alarm is generated if there have not been any successfully
ended TCH transactions or there have not been any successfully ended SDCCH
transactions in the BTS during the measurement period, and the operator does
not block the BTS.</p>


<p>Traffic Channel Interference (TCH)</p>


<p>This alarm is generated if the average interference of
a TCH TSL is above a defined threshold during a measurement period.</p>


<p>Usable TCH number below limit</p>


<p>If the ratio, which is counted from the operational states
of the channels, falls below the defined limit, an alarm is raised. The limit
can be given as a percentage parameter in the BSC. The TCH and SDCCH channels
are supervised in the same way.  The alarms are set and cancelled for each
cell separately. </p>


<p>Alarms ‘too short mean holding time  (the SDCCH, TCH)’
and ‘channel failure rate exceeded (the SDCCH, TCH)’ are TRX specific. This
is because of the BSS8, which will lead to a considerable reduction in the
amount of alarms since only one alarm per TRX is generated. The data provided
in the alarm information will indicate the channel(s) that is (are) the object(s)
of the alarm.</p>
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