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Path Balance in Huawei

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Ranking vs Link balnce
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Ranking vs Link balnce

Path balance stats are used to identify hardware issues in the base station. Therefore it is important to check path balance stats when you suspect hardware issues with degradation of KPIs.

Following equation should be satisfied if up link and down link is balanced (Huawei).

Downlink receiving level - Uplink receiving level – (MS sensitivity - BTS sensitivity) = 0 dB

The equation will be changed as per Huawei BTS sensitivity and MS sensitivity,

Downlink receiving level - uplink receiving level - 6 = 0 (Rank6)

Above table is used to matching path balance difference and Ranking.

Uplink and downlink balance level

Downlink receiving level - uplink receiving level - 6 (dB)

In ideal case when all the samples should be Rank 6 if path is balance. But in actual case sample distribution will be as follows.

 

Practically balanced uplink & downlink
Practically balanced uplink & downlink

High path loss in down link

If there is high path loss in down link, then downlink receiver level (MS receiver signal strength) will be low. Then path balance formula will result negative values.

Downlink receiving level - uplink receiving level - 6 < 0

Then high portions of samples will have rank 1 to rank 5.

 

Huawei HO parameters (watch time and valid time)

http://hubpages.com/hub/Watch-Time-and-Valid-Time-in-Huawei-GSM

 

High path loss in up link

If there is high path loss in up link, then uplink receiver level (BTS receiver signal strength) will be low. Then path balance formula will result positive values.

Downlink receiving level - uplink receiving level - 6 > 0

Then high portions of samples will have rank 7 to rank 11.

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