Introduction to No Traffic When no traffic occurs, subscribers cannot initiate calls in a normal cell or a normal cell cannot be occupied. Introduction When no traffic occurs, a cell or some TRXs serving the cell become faulty. As a result, cell coverage may be affected. In some cases, subscribers in an area cannot make calls. Therefore, when no traffic occurs, immediately resolve the problem to minimize the impact. The no traffic problem in a cell has the following symptoms: Performance counter: The value of the K3014:Traffic Volume on TCH counter is 0 during peak hours. User experience: MSs have trouble in accessing this cell and even cannot detect the cell. Maintenance console alarm: In the cell whose BCCH TRX is configured with TCHs or PDTCHs, the alarm file includes ALM-28008 Radio Link Failure (tributary No. = 2). The alarms associated with no traffic are reported at the TRX level. No traffic may occur in a BTS, cell, board, or TRX on the board, depending on the cell configurations. Associated Alarm For BSC6900 versions earlier than V900R014C00, ALM-28008 Radio Link Failure with tributary 2 serves as the no traffic alarm. For BSC6900 versions later than V900R014C00, the diagnosis on no traffic faults is enhanced and the function for independently reporting the alarm related to no traffic on TRXs is added. For details, see the description of ALM-28009 Carrier No Traffic. Whether to report the ALM-28008 Radio Link Failure or ALM-28009 Carrier No Traffic depends on the setting of the Reporting No Traffic Alarm Independently parameter in the MML command SET GTRXRLALM. For details, see Reporting the No Traffic Alarm Independently and No-Traffic Self-Healing. Symptom Check whether there is no traffic by using the following methods: Monitor BTS channel status. If channels in the problem cell cannot be occupied, but channels in neighboring cells can be occupied, there is no MS to access the cell. The no traffic problem is caused during the access phase. If the channel request has been received but the access fails, the no traffic problem is caused during the channel assignment.
1- Introduction of no traffic 2- locating no traffic 3- troubleshooting No Traffic Due to no Traffic 4-troubleshooting No Traffic Due to Transmission or Equipments faulty 5- troubleshooting No Traffic Due to incorrect data configuration 6- troubleshooting No Traffic Due to poor Um interface quality 7- troubleshooting No Traffic antenna system faulty 8- reporting the No Traffic alarm independenlty
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Transcript
Introduction to No Traffic
When no traffic occurs, subscribers cannot initiate calls in a normal cell or a normal cell cannot
be occupied.
Introduction
When no traffic occurs, a cell or some TRXs serving the cell become faulty. As a result, cell
coverage may be affected. In some cases, subscribers in an area cannot make calls. Therefore,
when no traffic occurs, immediately resolve the problem to minimize the impact.
The no traffic problem in a cell has the following symptoms:
Performance counter: The value of the K3014:Traffic Volume on TCH counter is 0
during peak hours.
User experience: MSs have trouble in accessing this cell and even cannot detect the cell.
Maintenance console alarm: In the cell whose BCCH TRX is configured with TCHs or
PDTCHs, the alarm file includes ALM-28008 Radio Link Failure (tributary No. = 2).
The alarms associated with no traffic are reported at the TRX level. No traffic may occur in a
BTS, cell, board, or TRX on the board, depending on the cell configurations.
Associated Alarm
For BSC6900 versions earlier than V900R014C00, ALM-28008 Radio Link Failure with
tributary 2 serves as the no traffic alarm. For BSC6900 versions later than V900R014C00, the
diagnosis on no traffic faults is enhanced and the function for independently reporting the alarm
related to no traffic on TRXs is added. For details, see the description of ALM-28009 Carrier No
Traffic.
Whether to report the ALM-28008 Radio Link Failure or ALM-28009 Carrier No Traffic
depends on the setting of the Reporting No Traffic Alarm Independently parameter in the
MML command SET GTRXRLALM. For details, see Reporting the No Traffic Alarm
Independently and No-Traffic Self-Healing.
Symptom
Check whether there is no traffic by using the following methods:
Monitor BTS channel status. If channels in the problem cell cannot be occupied, but
channels in neighboring cells can be occupied, there is no MS to access the cell. The no
traffic problem is caused during the access phase. If the channel request has been
received but the access fails, the no traffic problem is caused during the channel
The distributed indoor antenna system is powered off, and therefore no downlink signals are
available. As a result, MSs fail to access the network.
Troubleshooting Procedure
1. View the traffic statistics when the problem occurs in the cell. No channel requests are
reported in the cell, but the interference band messages are reported. The downlink
transmit power may be abnormal.
2. Reset the board hardware and software. The problem persists.
3. Perform the dialing tests onsite. No cell signals can be searched for in the coverage area.
4. Locate faults in the distributed indoor antenna system. The antenna connections are
correct and calls can be initiated on the TRX power output port.
5. Locate faults in the distributed indoor antenna system again. Extra power is supplied to
the distributed indoor antenna system. This indicates that no traffic occurs because the
distributed indoor antenna system is powered off.
Reporting the No Traffic Alarm
Independently
This section describes how to set the mode for reporting the no traffic alarm.
Function Description
The ALM-28008 Radio Link Failure alarm has seven tributaries, of which tributary 2 indicates
that no traffic is available on TRX.
Due to this reason, ALM-28008 Radio Link Failure is ignorable when it is reported. This
function is used for users to independently report the no traffic alarm and enabled by running the
MML command SET GTRXRLALM with Reporting No Traffic Alarm Independently set to
ON(On). After that, the TRX reports ALM-28009 Carrier No Traffic if no calls are processed on
the TRX within the specified period.
NOTE:
1. 3900 series base stations in V100R014C00 and later support reporting ALM-28009 Carrier No Traffic.
2. 3900 series base stations in versions later than BTS3000 V100R009 support reporting ALM-28008 Radio Link Failure . 3900 series base stations, 3012 series base stations, and other base stations in versions earlier than BTS3000 V300R008 still report ALM-4122 Radio Link Prompt Alarm for indicating no traffic on a TRX or BCCH TRX.
Procedure
GBTS
1. Run the MML command SET GTRXRLALM to enable the function for reporting the no traffic alarm independently. In this step, set the following parameters as follows:
o Set Wireless Link Alarm Flag to YES(Yes). o Set Reporting No Traffic Alarm Independently to ON(On).
2. Run the MML command LST GTRXRLALM to query the parameter settings of the function for reporting the no traffic alarm independently.
eGBTS
For an eGBTS, there is no command for enabling the BTS to report the no traffic alarm. By
If Reporting No Traffic Alarm Independently is set to ON(On) and if there is no traffic on any TRX, the BTS reports the ALM-28009 Carrier No Traffic alarm.
If Reporting No Traffic Alarm Independently is set to OFF(Off) and if there is no traffic on any TRX, the BTS reports the ALM-28008 Radio Link Failure alarm with the specific cause of No Traffic on TRX.
eGBTS
If the no traffic alarm is reported, ALM-28009 Carrier No Traffic is reported on the BSC LMT.