The offset of E-DPDCH power relative to DPCCH RX power is one of the major factors that determine the DPCCH RX power. A UE in low-rate little retransmission state requires less DPCCH RX power than it does in high-rate little retransmission state.

1. HUAWEI TECHNOLOGIES CO., LTD.
www.huawei.com
Huawei Performance Team
East JAVA 3G
Adaptive Configuration of Traffic Channel
Power offset for HSUPA

2. HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential
Background
With the increasing use of HSPA/HSPA+, the downlink peak data rate increases. The uplink performance needs to
be improved accordingly. According to the changes in UE behavior and network status, this feature dynamically
configures the optimum power control parameters for the uplink data channel of a UE, thereby increasing HSUPA
capacity. This feature only applies to HSUPA 10 ms BE services.
Solution
The offset of E-DPDCH power relative to DPCCH RX power is one of the major factors that determine the DPCCH
RX power. A UE in low-rate little retransmission state requires less DPCCH RX power than it does in high-rate
little retransmission state.
Feature1: Adaptive Configuration of Traffic Channel Power offset for HSUPA(R14 & R15)
DPCCH RX power in the small and large retransmission states
with this feature
DPCCH RX power in the small and large retransmission states
without this feature

3. HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential
The little retransmission state can be classified into high-rate little retransmission state or low-rate little
retransmission state according to the date rate.
UE is in the low-rate little retransmission state if following condition is met:
For a UE in the low-rate little retransmission state, HarqPOLitRetrLRate specifies the Hybrid Automatic Repeat
reQuest (HARQ) power offset. A larger HARQ offset increases the E-DPDCH power offset, decreases the DPCCH
RX power of the UE, and reduces cell uplink power load. The saved power can be used by other UEs to perform
high-rate data transmission, thereby increasing the HSUPA capacity in the cell.
When the average data rate of a UE is higher than the value of EdPOAdpAdjRateUpThd, the UE is in high-rate
little retransmission state. For a UE in the high-rate little retransmission state, HarqPOLitRetrHRate specifies the
HARQ offset. The DPCCH RX power can be adjusted by setting HarqPOLitRetrHRate to different values to
ensure that the HSUPA performance does not deteriorate.
For a UE in the large retransmission state, HarqPOLargeRetr specifies the HARQ offset. The HARQ offset can
be set to a proper value to ensure a stable DPCCH RX power.
UEData Rate >
EdPOAdpAdjRateDnThd
CellULLoad >
(MAXTARGETULLOADFACTOR
x TrigRatioforUlRTWP)
Feature1: Adaptive Configuration of Traffic Channel Power offset for HSUPA(R14 & R15)

4. HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential
Measurement
1. The HSUPA throughput increases after this feature is enabled. The increase can be monitored by checking
the RNC counters in the following table.
2. This feature is activated in RNC level, no cell level switch available for time being. Suggest to implement in
RNC TTCHMUHAMMAD1
Counter Description
VS.HSUPA.MeanChThroughput.TotalBytes Number of Total Bytes Received in Uplink of HSUPA MAC-d Flow for Cell
VS.HSUPA.MeanChThroughput Mean Uplink Throughput of single HSUPA MAC-d Flow for Cell
Feature1: Adaptive Configuration of Traffic Channel Power offset for HSUPA(R14 & R15)

5. HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential
Negative Impact
1. In the E-DPDCH power offset reconfiguration procedure, the Uu interface signaling is reconfigured. This
consumes radio resources and may affect key performance indicators (KPIs) such as the call drop rate.
Note:
PC_HSUPA_HARQNUM_AUTO_ADJUST_SWITCH only activated in RNCJEMBER1
2. This feature is highly dependent on parameter setting, the relevant parameter must retain the default values.
This feature may fail if these parameter are changed.
* Propose to fallback these parameter after 1 days this feature implemented to see the effect.
Feature1: Adaptive Configuration of Traffic Channel Power offset for HSUPA(R14 & R15)

6. HUAWEI TECHNOLOGIES Co., Ltd. HUAWEI Confidential
Thank You
www.huawei.com