eRAN13.1 Cross LTE Carriers Dynamic Power Sharing Feature Introduction.pptx

eRAN13.1 Cross LTE Carriers Dynamic Power Sharing Feature Introduction.pptx

1. eRAN13.1 Cross LTE Carriers Dynamic Power Sharing Feature Introduction

2. Objectives Upon completing this course, you will be able to: Have general knowledge of feature benefits and application scenarios. Have general knowledge of feature specifications. Explain feature principles. Perform installation, configuration, commissioning, and verification by following instructions provided in related manuals .

3. Reference Documents Cross LTE Carriers Dynamic Power Sharing Feature Parameter Description eNodeB Performance Counter Reference eNodeB MO Reference

4. Required Knowledge Communications basics LTE basics, including resource mapping and physical channels

5. Disclaimer This training document is used only for technical exchanges, and shall not be disclosed to customers.

6. Change History Version Description Date Author 1.0 Completed the draft. 2017-11-08 Zhang Yan (employee ID: 00193900) 1.1 Revised this document based on the review comments of GTS engineers. 2018-01-02 Zhang Yan (employee ID: 00193900) 1.2 Revised this document based on the review comments drawn during feature presentation. 2018-01-04 Zhang Yan (employee ID: 00193900)

7. Contents 1. Feature Roadmap 2. Feature Overview 3. Application Scenarios and Network Impacts 4. Engineering Guidelines 5. Application Cases 6. FAQs

8. 1. Feature Roadmap 2014 2013 2016 Q2 2017 Q2 eRAN12.1 eRAN11.1 None None eRAN13.1 Cross LTE Carriers Dynamic Power Sharing Cross LTE Carriers Dynamic Power Sharing (LTE FDD) Cross LTE Carriers Dynamic Power Sharing (LTE TDD) UMTS and LTE Dynamic Power Sharing (LTE FDD) 2018 Q2 Released Ready for Contract Planned Planning

9. Instantaneous data services are unevenly distributed among frequencies for the same sector. @YTAS: F1 (10 MHz)+F2 (15 MHz) (The probability of scheduling TTI-level resources of two frequencies at the same time is only 15 %.) Instantaneous distribution of UEs served by different frequencies in a single sector differ greatly. @YJSF: F1 (10 MHz)+F2 (20 MHz) (The instantaneous user load ratio of the two frequencies is 2:28.) 2. Feature Overview – Background An increasingly small time granularity is used for observation. The single-cell instantaneous PRB usage fluctuates significantly. 　 　 　 　 　 　 Sector 1 Sector 2 Sector 3 F2 F1 F3 The above network analysis shows that instantaneous load distribution is uneven among frequencies. In this situation, power of these frequencies can be mutually shared to obtain performance gains.

10. 2. Feature Overview – Technical Principles Maximum power restriction Time Maximum power that can exceed the statically configured TTI-level (1 ms) power in a cell Cell B Cell A Cross LTE Carriers Dynamic Power Sharing is enabled. Before Cross LTE Carriers Dynamic Power Sharing is enabled, the maximum power of each cell equals the statically configured power. After this feature is enabled, one cell can share the idle power of another cell at the TTI level. However, the total power of a power sharing group cannot exceed the sum of statically configured power of all cells. Maximum power restriction (statically configured power in a cell) Time Cell B Cell A Power used by cell A Power used by cell B Note: Cell A and cell B must use the same power amplifier .

11. 2. Feature Overview – Process and Constraints Specifications of a power sharing group Cells established on each BBP can form a maximum of three power sharing groups. There are at least two cells in a power sharing group. Each power sharing group supports power sharing between a maximum of four cells. Constraints on a power sharing group Cells using the same power amplification channel can share power with each other. Cells with the same number of downlink TX channels can share power with each other. If an RF channel serves an NB-IoT cell or a less than 5 MHz LTE cell, no power sharing group can be formed on this RF channel . eMTC -only cells cannot participate in power sharing. TDD cells can use only the subframe configuration 2 and special subframe configurations 5, 6, and 7. After this feature is enabled, a power sharing group is automatically set up. TTI-level (1 ms) power sharing Start Set up a power sharing group. Check the cell status. Does a cell share its power to other cells? Restrict the power used by a cell. A cell can use the statically configured power for scheduling. End No Y es Does a cell share power from other cells? A cell can use the power (which exceeds the statically configured power) for scheduling. Yes No

12. 3. Application Scenarios and Network Impacts Gains Gains in different scenarios (light- or medium-load scenarios) The average downlink RB usage is less than or equal to 40%. The proportion of benefited UEs is greater than or equal to 20%. Benefited UEs include: UEs using the QPSK modulation scheme, excluding signaling transmission and MCS selection with prioritized RBs UEs using DMRSs in TM9 mode UEs using TM7 or TM8 for LTE TDD The proportion of the last TTI before the downlink buffer is empty is less than 40 %. Item Average Downlink User-Perceived Rate ( RmvLastTTI ) Average Downlink User-Perceived Rate for CEUs ( RmvLastTTI ) Average Cell Throughput Quantitative gains 2% to 15% 5% to 20% 0 to 10%

13. 3. Application Scenarios and Network Impacts Network Impacts – Impact on the Network Modifying the switch controlling this feature will cause system parameter adjustment, which may cause service fluctuation for 3s to 4s. The impact of this feature on the downlink packet delay ( L.Traffic.DL.PktDelay.Time ) is related to services. If the tail packet ratio (the proportion of the last TTI before the downlink buffer is empty) is low, the downlink packet delay decreases. If the tail packet ratio is high, the downlink packet delay may increase. The average uplink and downlink user-perceived rates may decrease for cells that are sharing out power in most cases . To minimize the impact, you are advised to set CellPdcchAlgo . PdcchSymNumSwitch to ECFIADAPTIONON when enabling this feature. When this feature is enabled, the power utilization of RF modules increases. However, the power consumption of eNodeBs increases but does not exceed the maximum power consumption of all cells in full load. This feature adjusts the power of cells in a power sharing group in each TTI, which requires information exchange between cells. This may slightly increase the BBP CPU load by less than 5%. This feature determines and processes TTI-level power sharing based on UE scheduling in the previous TTI. A deviation may occur due to the real-time performance of LTE services. You are not advised to enable this feature when testing the downlink peak rate of the eNodeB . This feature increases the instantaneous power for PDSCH scheduling and may increase interference to neighboring cells. If the average cell throughput decreases or the interference to neighboring cells significantly increases (which is indicated by counters L.UL.Interference.PUSCH.Index0 to L.UL.Interference.PUSCH.Index15) when this feature is enabled, decreasing the CellDynPowerSharing . MaxPowerSharingRate parameter value can maximize the benefits. A larger value of this parameter helps increase the gains provided by this feature. Differences between FDD and TDD: For FDD, when this feature is enabled, the CFI increases to ensure uplink services in the cell that is sharing out power. As a result, the number of the second and third OFDM symbols occupied by the PDCCH increases, the number of available CCEs increases, and the CCE usage decreases. For TDD, power sharing is not performed on the PDCCH, and these impacts will not be generated.

14. 4. Engineering Guidelines 1 – Requirements Hardware/NEs Only macro eNodeBs support this feature. UMPT series main control boards or later boards are required to support this feature. UBBP series baseband processing boards or later boards are required to support this feature. The following RF modules are required to support this feature: FDD: RRU3962, RRU5507, and RRU5501 TDD: RRU3257 and RRU3279 License Feature ID Feature Name License Control Item NE Sales Unit LCOFD-131311 Cross LTE Carriers Dynamic Power Sharing (LTE FDD) Cross LTE Carriers Dynamic Power Sharing(LTE FDD)(per Cell) eNodeB Per Cell TDLCOFD-131311 Cross LTE Carriers Dynamic Power Sharing (LTE TDD) Cross LTE Carriers Dynamic Power Sharing(LTE TDD)(per Cell)

15. 4. Engineering Guidelines 1 – Feature Dependencies Feature ID Description Prerequisite features None None Impacted features LOFD-003029/TDLOFD-001075 SFN Cross LTE Carriers Dynamic Power Sharing is performed based on physical cells that share one RF module. When any of the listed features and Cross LTE Carriers Dynamic Power Sharing are enabled, Cross LTE Carriers Dynamic Power Sharing cannot provide maximum gains. If one of the RF modules serving an SFN cell does not support power sharing, negative gains will be generated. Therefore, Cross LTE Carriers Dynamic Power Sharing is not recommended in SFN cells. LOFD-070205/TDLOFD-002008 Adaptive SFN/SDMA LAOFD-111204 Adaptive SFN/SDMA with TM10 LOFD-001074 Intelligent Power-Off of Carriers in the Same Coverage of UMTS Network The cells that enter the energy saving state do not perform power sharing. LOFD-001042 Intelligent Power-Off of Carriers in the Same Coverage MRFD-121133 Multi-RAT Carrier Joint Intelligent Shutdown (eNodeB) LOFD-001039 RF Channel Intelligent Shutdown LOFD-001040 Low Power Consumption Mode TDLAOFD-003002 Intra-eNodeB DL CoMP in Adaptive Mode For TDD only: Intra-eNodeB CoMP involves DCS, JT, and CBF. Power sharing does not affect DCS and CBF. However, when the serving cell that support JT is sharing out power, fewer cell resources will be available for JT. This affects JT performance. TDLOFD-001077 MU-Beamforming For TDD only: When multiple UEs are paired, the power of each piece of data is reduced because multiple pieces of data share the same resource. When power sharing is enabled, the power of each piece of data increases and positive gains can be obtained. TDLEOFD-111505 DL D-MIMO For TDD only: Cross LTE Carriers Dynamic Power Sharing is performed based on physical cells that share one RF module. When any of the listed features and Cross LTE Carriers Dynamic Power Sharing are enabled, Cross LTE Carriers Dynamic Power Sharing cannot provide maximum gains. If one of the RF modules serving a D-MIMO cell does not support power sharing, negative gains will be generated. Therefore, Cross LTE Carriers Dynamic Power Sharing is not recommended in D-MIMO cells.

16. 4. Engineering Guidelines 1 – Feature Dependencies Feature ID Description Mutually exclusive features TDLBFD-00202201 Downlink Static Inter-Cell Interference Coordination The cell with power sharing enabled does not support both of the listed features as the cell adjusts power by restricting the number of RBs that can be scheduled. LOFD-060201/TDLOFD-060201 Adaptive Inter-Cell Interference Coordination LOFD-070208/TDLOFD-080203 Coordinated Scheduling based Power Control LOFD-070208/TDLOFD-080203 and Cross LTE Carriers Dynamic Power Sharing cannot be enabled at the same time. LOFD-081208/TDLOFD-001080 Inter- eNodeB SFN Based on Coordinated eNodeB Inter- eNodeB SFN cells and inter- eNodeB Adaptive Signaling Frequency Network (ASFN) cells cannot be added to a power sharing group. LOFD-081209/TDLOFD-001082 Inter-eNodeB Adaptive SFN/SDMA Based on Coordinated eNodeB LOFD-081221 Super Combined Cell Super Combined Cell is mainly used in high-speed or ultra high-speed mobility cells in high-speed railway scenarios. In these scenarios, cell load changes so rapidly that downlink power adjustment cannot promptly follow the load changes. A super combined cell must be a high-speed cell. LOFD-001007/TDLOFD-001007 High Speed Mobility In high-speed mobility scenarios, cell load changes so rapidly that downlink power adjustment cannot promptly follow the load changes. LOFD-001008/TDLOFD-001008 Ultra High Speed Mobility MRFD-231806 GSM and LTE Dynamic Power Sharing (LTE) GSM and LTE Dynamic Power Sharing supports power sharing involving a single LTE carrier. Cross LTE Carriers Dynamic Power Sharing supports power sharing between multiple LTE carriers. The two features cannot work together. TDLOFD-130205 Soft Splitting For TDD only: Soft split cells cannot be involved in dynamic power sharing. TDLEOFD-130501 Inter-Cell DL D-MIMO For TDD only: TDLEOFD-130501 and Cross LTE Carriers Dynamic Power Sharing cannot be enabled at the same time.

17. 4. Engineering Guidelines 2 – Deployment Activate the feature. Step 1: Run the MOD CELLDYNPOWERSHARING command with the LTE_DYN_POWER_SHARING_SW option of the DynamicPowerSharingSwitch parameter selected. MOD CELLDYNPOWERSHARING: LocalCellId=0, DynamicPowerSharingSwitch=LTE_DYN_POWER_SHARING_SW-1 Step 2: Configure feature parameters. MOD CELLDYNPOWERSHARING: LocalCellId=0, MaxPowerSharingRate=50 (default value) Deactivate the feature. Run the MOD CELLDYNPOWERSHARING command with the LTE_DYN_POWER_SHARING_SW option of the DynamicPowerSharingSwitch parameter deselected. MOD CellDynPowerSharing: LocalCellId=0, DynamicPowerSharingSwitch=LTE_DYN_POWER_SHARING_SW-0

18. Configure the following parameter when this feature is enabled. Retain the default value ( 50 ) of this parameter for UEs in the center area of a cell using this feature. For the edge area, set this parameter to a value less than 50 to reduce interference to neighboring cells . 4. Engineering Guidelines 3 – Key Parameter Adjustment Parameter ID Recommended Value Description MaxPowerSharingRate 50 (unit: %) This parameter indicates the maximum proportion of power that an LTE cell can share from other carriers to the statically configured power. Cells not using this feature Center areas of cells using this feature Edge areas of cells using this feature

19. 4. Engineering Guidelines 4 – Activation Verification Check feature activation. The following commands are added to verify the feature validation status. The following counters are added. The values of these counters are not 0 after this feature is enabled. Use the following KPI calculation formulas to check feature gains . MML Command Description DSP CELLDYNPWRSHASTATUS Use this command to query the status of dynamic power sharing in a cell. DSP ENODEBPAGRP Use this command to query the dynamic power sharing group. Counter Description L.PwrShare.PwrIn.TTI.Num This counter measures the number of TTIs in which the power of a cell is shared from other cells. It is used to analyze when feature gains are available in the cell. L.PwrShare.PwrOut.TTI.Num This counter measures the number of TTIs in which a cell shares the power with other cells. It is used to analyze when a cell shares the power with other cells. KPI Calculation Formula Average downlink user throughput ( L.Thrp.bits.DL – L.Thrp.bits.DL.LastTTI )/ L.Thrp.Time.DL.RmvLastTTI Average downlink CEU throughput* ( L.Thrp.bits.DL.BorderUE – L.Thrp.bits.DL.LastTTI.BorderUE )/ L.Thrp.Time.DL.RmvLastTTI.BorderUE Average cell downlink throughput L.Thrp.bits.DL / L.Thrp.Time.Cell.DL.HighPrecision TB transmission rate of UEs using QPSK L.Traffic.DL.SCH.QPSK.TB.bits / L.Traffic.DL.SCH.QPSK.TB The asterisk (*) indicates that you can activate this counter by selecting the BasedA3EdgeUserSwitch option of the CellCounterParaGroup . CellCounterAlgoSwitch parameter and setting EdgeUserA3Offset to –12 .

20. 4. Engineering Guidelines 5 – Optimization Feature optimization guidelines cover performance optimization, fault locating methods, and parameter adjustment suggestions. To minimize the possible impact of cells sharing power with other carriers on the user-perceived rate, you are advised to retain the default value ( ECFIADAPTIONON ) of the CellPdcchAlgo . PdcchSymNumSwitch parameter when enabling this feature. If the average cell throughput decreases or the interference to neighboring cells significantly increases (which is indicated by counters L.UL.Interference.PUSCH.Index0 to L.UL.Interference.PUSCH.Index15) when this feature is enabled, decreas ing the CellDynPowerSharing . MaxPowerSharingRate parameter value can maximize feature benefits. A larger value of this parameter helps increase the gains provided by this feature .

21. 5. Application Cases None

22. 6. FAQs None