VNPT HSPA Plus Analysis 20120319
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Transcript of VNPT HSPA Plus Analysis 20120319
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VNPT HSPA+ Analysis Low Data Rate Investigation
Preliminary version Mar, 2012
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Hanoi HSPA+ Analysis Low Data Rate Investigation
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HSPA+ Log Analysis
UE is Release 8 HSDPA Cat24 supporting DC-HSDPA up to 42Mbps on downlink
If network supports Release 7 only, then UE can support HSDPA Cat14 (up to 21Mbps)
HSUPA Cat 6 supports up to 5.7Mbps on uplink
Low Data Rate under Excellent RF
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HSPA+ Log Analysis
Network sent Radio Bearer Setup to configure HSDPA but not with 64QAM servingHSDSCH-RL-indicator: 1
User data payload carried on HS-DSCH
Signaling Radio Bearers (SRBs) on R99 A-DPCH (SF256)
64QAM configured not found
Measurement Power Offset: 7.5dB
DeltaACK, DeltaNACK, DeltaCQI = 7
4 HS-SCCHs thus the max number of HS-PDSCHs = 14
Uplink R99 with SF16 (64kbps) servingEDCH-RL-indicator: 0
Low Data Rate under Excellent RF
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HSPA+ Log Analysis Low Data Rate 100% scheduling Avg TBS = Max TBS
Very low NACK %
100% 16QAM
Top CQI L1 data rate: 12.55Mbps
# of HS-PDSCHs = 14
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HSPA+ Log Analysis
UE is capable of supporting up to 42Mbps on DL and up to 5.7Mbps on UL
Network configured only HSDPA Cat 10 (up to 14Mbps) without 64QAM If 64QAM is configured, then we should see the following in the RB Setup message:
Due to 4 HS-SCCHs configured, network could only assign up to 14 HS-PDSCHs so the max L1 data rate would be 12.55Mbps Max TBS = 25105 bits per 2ms TTI
Max L1 data rate = 25105 / 0.002 = 12.55Mbps
With one HS-SCCH and 64QAM support, 15 HS-PDSCHs can be assigned with TBS = 42192 bits (Max L1 data rate = 42192 / 0.002 = 21Mbps)
Suggest checking the 64QAM support in the network (feature license, Node B SW/HW, RNC SW, etc)
Low Data Rate under Excellent RF - Conclusions
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VNPT HSPA+ Analysis Low Data Rate InvestigationHanoi HSPA+ Analysis Low Data Rate InvestigationHSPA+ Log AnalysisHSPA+ Log AnalysisHSPA+ Log AnalysisHSPA+ Log Analysis
