oeo300010 lte network tuning issue1.00

8/9/2019 Oeo300010 Lte Network Tuning Issue1.00

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Single site verification:

Single site verification step ensures every single site can work normally. Network tuning:

The main target of network tuning is to ensure the coverage, control interference

and clear basic handover problems. Normally network tuning is based drive test.

Network parameters optimization:

In network parameter optimization step, the main target is to ensure the KPI

performance by field test and KPI statistics analysis.

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The figure in the slide shows the RSRP distribution of the best cell.

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The figure in the slide shows the distribution of PCI for the best cell.

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The distribution of UE transmission power reflects the distribution of uplink interference

and uplink path loss.

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It can be seen from the figure in the slide that the UE transmission power is lower than 10

dBm in normal situations, and will rise dramatically over 10 dBm only when there is an

uplink interference or coverage area edge. In comparison, a macro cell is more likely to

subject to uplink coverage restriction than a micro cell.

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As shown in Figure, Over coverage is caused by the cell whose PCI is 288.

Over Coverage will interfere with other cells and increase the call drop probability.

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Uplink and downlink are not completely separated, poor downlink channel quality not only

affects the downlink signaling demodulation. For example, incorrect PDCCH demodulation

affects the scheduling of uplink signaling, resulting in uplink signaling lost. Therefore, we

cannot think easily that the lost of uplink signaling is the result of poor downlink channel

quality.

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All the parameters can shown in GENEX Probe which is HUAWEI drive test software.

IBLERis initial BLER.

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In the signaling trace result, UE sent several measurement reports to eNodeB by didnt

receive the handover command from eNodeB. Then call drop happened.

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To confirm the problem, we can also check the neighboring cell configuration in eNodeB.

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In eNodeB side we can see that eNodeB received several MEASUREMENT REPORT and

sent RRC CONNECTION RECONFIGURATION(handover command). Whats more,

eNodeB sent HANDOVER REQUEST to the target eNodeB.

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In UE side we can see that UE sent several MEASUREMENT REPORT to eNodeB, but it

didnt receive RRC CONNECTION RECONFIGURATION(handover command) from

eNodeB.

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We can see that the time duration is 2 seconds in which the RSRP in target cell is 1dB

higher than RSRP in serving cell. But after the 2 seconds RSRP in serving cell decrease very

fast. So UE can not receive handover command due to bad downlink channel quality.

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Mnis the measurement result of the neighboring cell.

Ofnis the frequency-specific offset for the frequency of the neighboring cell. Ocnis the cell-specific offset (that is, CIO) for the neighboring cell.

Ofsis the frequency-specific offset for the serving frequency.

Ocsis the cell-specific offset for the serving cell.

Hysis the hysteresis for event A3.

Offis the offset for event A3.

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oeo300010 lte network tuning issue1.00

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