Ericsson Radio Systems AB PKRC1311004-1 Manual De Usuario
Frequency Allocation Support
34
Frequency Allocation Support
The FAS function measures the interference level on a number of
frequencies, specified by the operator. The measurements are performed
on idle channels or idle burst positions.
frequencies, specified by the operator. The measurements are performed
on idle channels or idle burst positions.
The TRXC:s execute the FAS function independently of each other
(however all TRXC:s don’t have to be used). Thus it is here described
only how the FAS function works on one TRXC.
(however all TRXC:s don’t have to be used). Thus it is here described
only how the FAS function works on one TRXC.
FAS measurements can start when the TRXC has been configured with
a list of FAS frequencies. Measurements are performed during one or
several FAS measurement periods.
a list of FAS frequencies. Measurements are performed during one or
several FAS measurement periods.
Each FAS measurement period is started and stopped by Abis O&M
messages. During the FAS measurement period the TRXC shall handle
the measurement of the signal levels, on all specified frequencies, once
every 15:th second and accumulate the result in one histogram for each
frequency.
messages. During the FAS measurement period the TRXC shall handle
the measurement of the signal levels, on all specified frequencies, once
every 15:th second and accumulate the result in one histogram for each
frequency.
The result of the measurements is reported on Abis O&M interface on
request as calculated median and percentile values for each frequency.
The number of times each frequency has been measured on is also
reported.
request as calculated median and percentile values for each frequency.
The number of times each frequency has been measured on is also
reported.
34.1
References
/GSM:05.05/
34.2
Concepts
Percentile value: The proportion of samples in a distribution.
An example: The 90 percentile value for a distribution is the value for
which 90 percent of the samples have a value equal to or less than the
percentile value.
which 90 percent of the samples have a value equal to or less than the
percentile value.
34.3
Functions
34.3.1
FAS configuration
A Frequency List is received on Abis O&M interface containing
maximum 150 frequencies to measure on. The frequencies are coded in
a way that can be interpreted as ARFCN:s with a value ranging from 0
until 1023. This value range is accepted (The BTS can however only
measure on frequencies for which it has capability). The relation
between frequencies and ARFCN:s is specified in /GSM:05.5:1.1/.
maximum 150 frequencies to measure on. The frequencies are coded in
a way that can be interpreted as ARFCN:s with a value ranging from 0
until 1023. This value range is accepted (The BTS can however only
measure on frequencies for which it has capability). The relation
between frequencies and ARFCN:s is specified in /GSM:05.5:1.1/.
The FAS support capability and the number of frequencies transferred
are checked.
are checked.
All eventually on-going measurements are stopped.
Measurement result are cleared.
34.3.2
Start measurement
FAS measurement will be started by O&M message. Old measurement
results are Optionally cleared.
results are Optionally cleared.
EN/LZT 720 0008
R1A
2001-06-26
265 (421)
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