Case studyTypical scenario · demonstration dataLTE · band 20Indoor · DASUplink noise rise · PIM

Uplink noise rise on a shared DAS: diagnosing passive intermodulation

Stationary test point in a building covered by a shared multi-operator DAS, LTE band 20 (800 MHz), uplink, downlink and simultaneous tests.

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Verification

Before/after comparison

KPI	Before	After
PUSCH power, simultaneous test	23 dBm	11 dBm
UL throughput, simultaneous test	1.0 Mbit/s	15.5 Mbit/s
UL retransmissions, simultaneous test	19%	3%
Allocated UL RBs, simultaneous test	6	40
DL throughput, simultaneous test	36 Mbit/s	53 Mbit/s
Correlation of DL throughput with PUSCH power	0.93	−0.37

Typical scenario replayed in AKCELL Analyzer on demonstration data; the values are those computed by the tool on these sessions.

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