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Call Setup Analysis
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Call Performance Issues
at 3g 3g,, performance performance,, tutorial Got some reading which i though useful for u who work on network performance or fault management, kinda action that can taken in solving common issue in 3G network. Behaviour Call set-up failure
Problem Poor coverage area
Call drop
Description
If problem is poor coverage, this means poor RSCP (<-95 dBm) thus also the EcNo derades very rapidly (< -12 dB) when the coverage border is reached.
Possible solutions Check Antenna line installation (antenna position and quality, cable length and quality). Check that CPICH powers are balanced between the studied cells. Check presence of shadowing obstacles.
Call set-up failure
Poor dominance area.
No main server in the area, too many cells with weak CPICH level.
Add a site to the area. Use buildings and other environmental structures to isolate cell(s) coverage.
Call drop CPICH EcNo is usually very bad even the RSCP is good e.q. RSCP –80… RSCP –80…-90 -90 dBm but EcNo about – about – 10 10 dB
Call set-up failure
Pilot Pollution
Call drop
Dropped call/SHO failure
Missing neighbour
Bad CPICH Ec/Io (<-12 dB) level although CPICH RSCP level is good. High site in the neighbourhood may cause interference.
A good usable neighbour is present within cells coverage area, can cause DL interference if it is not in the active set. Swapped sectors in WBTS.
Down tilt antennas to make cells dominant and limit effects of interfering cell(s). Check antenna bearing. Add a site. Find interfering cell from Scanner results. Adjust antenna bearing and down tilt or lower the antenna height (too much tilt will break the dominance). Add interfering cell to the neighbour of the serving cell. Check scanner data and look for missing neighbours. Check the cabling in antenna line.
Behaviour Call set-up Failure Call drop
Problem High PrxTotal due to UL External interference
Description The PrxTotal level is significantly higher than expected in no/low load conditions.
Possible solutions Try to figure the possible area/direction of the interference by checking PrxTotal level on neighbouring cells. Alternatively use spectrum analyser & directive antenna to locate interferer. Inform operator/regulator about the found conditions.
Call set-up failure
High PrxToatal due to wrong MHA settings
Call drop
The PrxTotal level is significantly higher than expected in no/low load conditions. MHA settings should be checked, see more in reference [7]
Call set-up failure Call drop Cell set-up failure
Long call set-up time
Check if auto tuning range is large enough (20 dB). In case of MHA is used in BTS check MHA and cables loss parameters, otherwise PrxTotal value will be too high.
High Prxtotal due to Installation problems
The PrxTotal level is significantly higher than expected in no/low load conditions.
(If MHA parameter is set to ON, Cable loss parameter is used, Cable loss = Real MHA gain = Feeder loss parameter) Check the antenna installation as the last alternative in high PrxNoise case.
Bad RRC connection setup success rate due to slow Ue cell reselection
RRC connection set-up complete message not heard by BTS.
Set parameters so that reselection process will start earlier:
Long time interval for sync between RNC and BTS before connection
The value of Parameter N312 is too high: maximum number of “in sync” indications received from L1 during the establishment of a physical channel
Qqualmin, Sintrasearch and Qhyst2 as per latest recommendation [8] Use smaller value N312 (2, recommendation is 4). Use Actix for checking the call set-up delay (L3 messages). Use call set-up time optimisation feature Dynamic setting of “ActivationTimeOffset” (possible in RAN1.5.2 ED2) enables 200 to 500ms reduction for set up delay.
Behaviour Dropped call
Problem SHO to wrong cell will cause drop call.
Dropped call
Cell suffering from UL interference = DL (CPICH) coverage much bigger than UL coverage
Dropped call
Dropped call
Dropped call/SHO failure
DL CPICH coverage <>
Round the corner effect
Too many neighbours
Description Overshooting cell come temporarily into active set and forces a suitable serving cell to be dropped out. Later RSCP suddenly drops in the “wrong cell” and causes a dropped call because there is no neighbour defined. As the UE Tx power is not enough for target cell synchronisation, the SHO fails which will cause call drop later.
Cell with lower CPICH power than the surrounding is having “too good” UL performance, as this cells’ UL cannot be used efficiently due to SHO is decided upon DL (CPICH Ec/No). The call drops due to too rapid CPICH coverage degradation for Cell A, and therefore there is not enough time for SHO.
In SHO area the number of combined neighbouring cells become more than 31. HO list is created using RNC algorithm in the final stage some of the neighbours will randomly be removed.
Possible solutions Pan away overshooting cell if it is too close to the serving cell, otherwise apply down tilting as well.
Use cell individual offset (negative value) parameter to balance the DL and UL coverage. Check traffic direction of incar UEs to decide which cell requires offsets. Use cell individual offset (positive value) parameter to balance the DL and UL coverage. Note: Cell individual offsets are not taken into account when calculating the added cell Tx power. Use cell individual offset (positive value) parameter to balance the DL and UL coverage. Note: Cell individual offsets are not taken into account when calculating the added cell Tx power. Delete unnecessary neighbours. Improve dominance.
