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LTE1336: Interference awareUL power control Issue 01 LTE1336: Interference aware UL power control The information in this document applies solely to the hardware/software product (“Product”) specified herein, and only as specified herein. Reference to “Nokia” later in this document shall mean the respective company within Nokia Group of Companies with whom you have entered into the Agreement (as defined below). This document is intended for use by Nokia's customers (“You”) only, and it may not be used except for the purposes defined in the agreement between You and Nokia (“Agreement”) under which this document is distributed. No part of this document may be used, copied, reproduced, modified or transmitted in any form or means without the prior written permission of Nokia. 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If you should have questions regarding our Environmental Policy or any of the environmental services we offer, please contact us at Nokia for any additional information. 2 © 2017 Nokia Issue: 01 LTE1336: Interference aware UL power control Table of Contents This document has 14 pages 1 Description of LTE1336: Interference aware UL power control......6 1.1 Benefits.......................................................................................... 6 1.2 Functional description.................................................................... 6 1.3 System impact................................................................................8 1.4 LTE1336 reference data.................................................................9 2 Activating and configuring LTE1336: Interference aware UL power control...........................................................................................11 3 Deactivating LTE1336: Interference aware UL power control...... 14 Issue: 01 © 2017 Nokia 3 LTE1336: Interference aware UL power control List of Figures Figure 1 Interference-aware UL power control diagram..................................... 7 4 © 2017 Nokia Issue: 01 LTE1336: Interference aware UL power control List of Tables Table 1 LTE1336 hardware and software requirements....................................9 Table 2 Existing counters related to LTE1336................................................. 10 Table 3 New parameters introduced by LTE1336........................................... 10 Table 4 LTE1336 sales information................................................................. 10 Table 5 Parameters used for activating and configuring LTE1336: Interference aware UL power control...................................................................... 11 Issue: 01 © 2017 Nokia 5 Description of LTE1336: Interference aware UL power LTE1336: Interference aware UL power control control 1 Description of LTE1336: Interference aware UL power control Introduction to the feature The LTE1336: Interference aware UL power control feature improves the uplink (UL) cell capacity and the cell-edge performance. The interference-aware uplink power control is used for the power control on the physical uplink shared channel (PUSCH). The eNB uses its own measurements and the UE's measurements as input for the algorithm. The eNB controls the UE-specific transmit power to optimize the trade-off between the throughput achieved in its own cell and the UL interference in the neighboring cells. 1.1 Benefits End-user benefits This feature increases the uplink throughput of end users. Operator benefits This feature provides higher uplink cell capacity and improved cell-edge throughput that offers additional services and better service coverage. 1.2 Functional description The LTE1336: Interference aware UL power control feature provides improved throughput over the existing closed-loop and open-loop UL power controls. The UL PUSCH transmissions from the UE are received as wanted signal from the cell, but are received as interference from the neighboring cells. Especially, UEs closer to the cell border cause high interference to the neighboring cells. Decreasing the transmit power of UEs close to the cell border decreases on first view the achieved throughput in the serving cell, but it reduces the interference in the neighboring cells. With this feature, achieving a higher throughput in a whole range of cells is possible by reducing the uplink interference level in a complete area. The main function of this feature’s mechanism is to make the UE UL power achieve the optimum system-wide throughput. This mechanism produces and updates the target signal-to-interference- plus-noise ratio (SINR) value for each UE based on the eNB measurements and UE- reported data. The power control loop converts deviations of the measured SINRs from the target SINR into power-up and power-down commands that are sent to the UE. This feature must be activated in all cells of an area to attain its full benefits. If this feature is activated on a single eNB, the reduced UL power in the cell is not accompanied by a reduced interference from the adjacent cells. This results in the decrease in SINR and degraded UL throughput. When activated in all eNBs of an area, but with an even distribution of the UEs, the operation of the feature shows an increase in the overall UL throughput, which is pronounced in cell centers and less visible in cell borders. Some downlink (DL) traffic is needed for the UEs to reliably report the channel quality indicator (CQI). 6 © 2017 Nokia Issue: 01 LTE1336: Interference aware UL power control Description of LTE1336: Interference aware UL power control The UE transmit power can be reduced at the same time the interference level is reduced. In noise-limited scenarios, the UEs reach their power limits. Reducing the transmit power directly affects the UL throughput. This feature is not suitable for the following: • Scenarios with neighboring cells whose DL powers differ by more than ~12 dB. • Networks with repeaters that operate with different gains between uplink and downlink directions. Repeaters with asymmetric gains distort the eNB's calculation of path loss ratio. Unexpected results are acquired if the DL gain differs from the UL gain. Figure 1 Interference-aware UL power control diagram owncell ownUE othercells Pown,PL DL SINR Pother ,PL' SINR Target DL CQI UL interference + power command - UL Signal RSSI UL SINR UL interference This feature deals with various SINR values: • UL SINR is the UE-specific SINR of the UE’s UL transmission, received at the eNB, over interference and noise level at the eNB’s receiver(s). The UL SINR is one input to the control loop and it is compared to a variable threshold, SINR_Target. • SINR_Target is the UE-specific target value for the UL SINR. With the LTE1336: Interference aware UL power control feature activated, the eNB calculates and transmits power-up/down commands to its UEs to keep the UL SINR as close as possible to the calculated SINR_Target. The SINR_Target depends on the ratio PL’/PL of path losses at the UE’s location, which the eNB derives from DL SINR. • DL SINR is the UE’s SINR at the UE. The DL SINR is a measure of the ratio of the path loss from the UE towards another eNB and the path loss towards its own eNB. The DL SINR is reflected in the UE’s CQI reports which are received at eNB and used to derive the path loss ratio that enters into the SINR_Target equation. The LTE1336: Interference aware UL power control feature introduces the actUlpcMethod parameter that replaces ulpcEnable, ulpcPuschEn, ulpcPucchEn, and ulpcSrsEn parameters from the previous releases, and offers to select one of the valid modes of UL power control. The parameter actUlpcMethod is used for feature activation and offers various combinations between the open-loop, closed-loop, and interference-aware power control for the PUSCH, physical uplink control channel (PUCCH), and the sounding reference signal (SRS). The following parameters are also introduced in this feature: Issue: 01 © 2017 Nokia 7 Description of LTE1336: Interference aware UL power LTE1336: Interference aware UL power control control • The Cell-center/edge balancing for interference-aware UL- PC (ulpcCEBalanceIAw) parameter controls the target SINR in the interference- aware UL-PC and provides a tilt in balancing the target SINR in the cell center and cell edge. • The Minimum waiting time for next UL-PC decision (ulpcMinWaitForPc) parameter defines the minimum transmission time interval (TTI) (ms) before another UL power decision is made for the UE. • The Minimum UL quality for interference-aware UL- PC (ulpcMinQualIAw) parameter defines the minimum quality for the interference- aware UL-PC. The target SINR for the UEs during poor condition cannot be lower than the limit defined by this parameter even if it generates a higher UL interference. • The Reference UL power value for interference-aware UL- PC (ulpcRefPwrIAw) parameter controls the target SINR in the interference-aware UL-PC. Regardless of the path loss ratio, this parameter provides an equal shift of the target SINR for all the UEs in the cell. • The Maximum RSSI for interference-aware UL-PC (ulpcRssiMaxIAw) parameter sets the upper limit for the received signal strength indicator (RSSI), which is received from the UE. If this upper limit is exceeded, the next power command indicates a -1 dB UL power change even if the current UL power is insufficient for reaching the target SINR. • The Nominal PUSCH P0 for interference-aware UL- PC (p0NomPuschIAw) parameter is used for SIB2 broadcasting of the P0 when the interference-aware UL-PC is activated. The ulpcCEBalanceIAw, ulpcMinWaitForPc, ulpcMinQualIAw, ulpcRefPwrIAw, and ulpcRssiMaxIAw parameters are used for tuning the UL-PC algorithm. 1.3 System impact Interdependencies between features This feature requires one of the following features to be activated: • LTE27: Open loop UL power control and DL power setting • LTE28: Closed-Loop UL power control The feature gain (throughput improvement over open-loop UL-PC) is limited if the influence of interference from the adjacent cells is mitigated by other features, such as: • Antenna tilt (LTE160: Flexi BTS 3GPP antenna tilt support) With the antenna downtilt, cells are decoupled from each other and both outer-loop power control (OL-PC) and interference-aware UL-PC achieve higher throughput. • Interference rejection combining (IRC) (LTE979: IRC for 2 RX paths and LTE980: IRC for 4 RX paths) The IRC can significantly reduce the influence of one single source of interference against an individual wanted transmission. This benefit applies to both OL-PC and interference-aware UL-PC. • LTE619: Interference-aware UL Scheduler (in conditions of fractional UL load) The interference-aware UL schedulers in adjacent cells can reduce mutual interference by assigning UL transmissions in different areas of the UL spectrum. This benefit also applies to all kinds of UL-PC. 8 © 2017 Nokia Issue: 01 LTE1336: Interference aware UL power control Description of LTE1336: Interference aware UL power control Impact on interfaces This feature has no impact on interfaces. Impact on network and network element management tools This feature has no impact on network management or network element management tools. Impact on system performance and capacity The feature is expected to show an increase in the overall UL throughput, pronounced in cell centers and less visible at cell borders. 1.4 LTE1336 reference data Description of LTE1336: Interference aware UL power control requirements, alarms and faults, commands, measurements and counters, KPIs, parameters, and sales information Requirements Table 1 LTE1336 hardware and software requirements FDD TDD System release RL60 RL45TD Flexi Multiradio 10 BTS LBTS6.0 TD-LBTS4.0 Flexi Multiradio 10 Indoor BTS Not supported TD-LBTS4.0 Nokia AirScale BTS FL16A TL16A Flexi Zone BTS LBTS7.0 TD-LBTS5.0 Flexi Zone Access Point FL15A TL15A Cloud Flexi Zone Controller FL17A TL15A OMS Support not required Support not required NetAct NetAct8 EP1 NetAct8 EP1 MME Support not required Support not required SAE GW Support not required Support not required UE 3GPP R8 mandatory 3GPP R8 mandatory Alarms There are no alarms related to the Description of LTE1336: Interference aware UL power control feature. Measurements and counters Issue: 01 © 2017 Nokia 9 Description of LTE1336: Interference aware UL power LTE1336: Interference aware UL power control control Table 2 Existing counters related to LTE1336 Counter ID Counter name Measurement M8012C21 PDCP Throughput UL Min LTE Cell Throughput M8012C22 PDCP Throughput UL Max LTE Cell Throughput M8012C23 PDCP Throughput UL Mean LTE Cell Throughput Key performance indicators There are no key performance indicators related to the Description of LTE1336: Interference aware UL power control feature. Parameters Table 3 New parameters introduced by LTE1336 Full name Abbreviated name Managed Parent structure FDD/TDD object Maximum RSSI for ulpcRssiMaxIAw LNBTS - common interference-aware UL-PC Method for UL power actUlpcMethod LNCEL - common control Interference aware ulpcIAwConfig LNCEL - common UL-PC configuration Nominal PUSCH P0 p0NomPuschIAw LNCEL ulpcIAwConfi common for interference- g aware UL-PC Cell-center/edge ulpcCEBalanceI LNCEL ulpcIAwConfi common balancing for Aw g interference-aware UL-PC Minimum UL quality ulpcMinQualIAw LNCEL ulpcIAwConfi common for interference- g aware UL-PC Minimum waiting ulpcMinWaitFor LNCEL ulpcIAwConfi common time for next UL-PC Pc g decision Reference UL power ulpcRefPwrIAw LNCEL ulpcIAwConfi common value for g interference-aware UL-PC Sales information Table 4 LTE1336 sales information Product structure class License control Activated by default ASW SW Asset Monitoring No 10 © 2017 Nokia Issue: 01 LTE1336: Interference aware UL power control Activating and configuring LTE1336: Interference aware UL power control 2 Activating and configuring LTE1336: Interference aware UL power control Before you start Restart of the eNB is not required after activation of this feature. The following must be set before the activation of LTE1336: Interference aware UL power control: • The LNCEL parameter Alpha (ulpcAlpha) is set to 1. • The LNCEL parameter Enable DL AMC (dlamcEnable) is set to true. • The LNCEL parameter Enable OLQC (dlOlqcEnable) is set to true. • The LNCEL parameter Enabled TB size impact to UE PUSCH power calculation (deltaTfEnabled) is set to false. g Note: Activation and deactivation of this feature cause an execution of the System Information Modification procedure and increase the valueTag parameter (see, 3GPP TS36.331). There can be a mismatch between SIB in the cell and SIB data held by a UE if the valueTag is increased 31 or more times within 3 hours. Table 5 Parameters used for activating and configuring LTE1336: Interference aware UL power control Parameter Purpose Requires eNB restart or object locking Method for UL power control activation value no (actUlpcMethod) Interference aware UL-PC configuration optional configuration no (ulpcIAwConfig) set of parameters Maximum RSSI for interference-aware optional configuration no UL-PC (ulpcRssiMaxIAw) One of the following features needs to be activated/configured before activation of LTE1336: Interference aware UL power control, in order to provide PUCCH power control: • LTE27: Open loop UL power control and DL power setting • LTE28: Closed-Loop UL power control Procedure 1 Follow the general procedure described in section Activating and deactivating LTE features using BTS Site Manager. In Step 3 (Modify the feature-specific eNB configuration settings) of the general procedure, perform the steps described in this procedure. Issue: 01 © 2017 Nokia 11 Activating and configuring LTE1336: Interference aware LTE1336: Interference aware UL power control UL power control 2 Set the activation value. a) Go to the Radio Network Configuration page. b) Expand the MRBTS object. c) Expand the LNBTS object. d) Select the LNCEL object corresponding to the cell where the LTE1336: Interference aware UL power control feature will be activated. e) Set the Method for UL power control (actUlpcMethod) parameter value to either: • PuschIawPucchOL • PuschIawPucchCL g Note: This parameter activates the feature. 3 Define Interference aware UL-PC configuration (ulpcIAwConfig). a) Expand the MRBTS object. b) Expand the LNBTS object. c) In each LNCEL object under selected LNBTS, repeat the following actions: 1. If the Interference aware UL-PC configuration object is not available under LNCEL, right-click the LNCEL object and then select New Interference aware UL-PC configuration. 2. Expand Interference aware UL-PC configuration under LNCEL object. 3. Select Interference aware UL-PC configuration-1 and define all the parameters within this object. g Note: This action is optional because the Interference aware UL-PC configuration (ulpcIAwConfig) parameter's structure has default values set during the object creation. The modification of the default values is not mandatory. 4 Configure the Maximum RSSI for interference-aware UL- PC (ulpcRssiMaxIAw) (optional). a) Go to the Radio Network Configuration page. b) Expand the MRBTS object. c) Select the LNBTS object. d) Set the value for the Maximum RSSI for interference-aware UL- PC (ulpcRssiMaxIAw) parameter. 5 Send the parameters to the eNB according to the procedure described in section Activating and deactivating LTE features using BTS Site Manager. Expected Outcome 12 © 2017 Nokia Issue: 01 LTE1336: Interference aware UL power control Activating and configuring LTE1336: Interference aware UL power control The LTE1336: Interference aware UL power control feature is activated in the cell. Issue: 01 © 2017 Nokia 13 Deactivating LTE1336: Interference aware UL power LTE1336: Interference aware UL power control control 3 Deactivating LTE1336: Interference aware UL power control Before you start Restart of the eNB is not required after deactivation of this feature. The Method for UL power control (actUlpcMethod) parameter is used to deactivate the feature. g Note: Activation and deactivation of this feature cause an execution of the System Information Modification procedure and increase the valueTag parameter (see, 3GPP TS36.331). There can be a mismatch between SIB in the cell and SIB data held by a UE if the valueTag is increased 31 or more times within 3 hours. Procedure 1 Follow the general procedure described in section Activating and deactivating LTE features using BTS Site Manager. In Step 3 (Modify the feature-specific eNB configuration settings) of the general procedure perform the steps described in this procedure. 2 Set the Method for UL power control (actUlpcMethod) parameter. a) Go to the Radio Network Configuration page. b) Expand the MRBTS object. c) Expand the LNBTS object. d) Select the LNCEL object corresponding to the cell where the LTE1336: Interference aware UL power control feature will be deactivated. e) Set the Method for UL power control (actUlpcMethod) parameter to any value other than: • PuschIawPucchOL • PuschIawPucchCL 3 Send the parameters to the eNB according to the procedure described in section Activating and deactivating LTE features using BTS Site Manager. Expected Outcome The LTE1336: Interference aware UL power control feature is deactivated in the cell. 14 © 2017 Nokia Issue: 01
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