Uplink Coordinated Multi-Point Reception Feature Description 130/221 04-LZA 701 6014/1 Uen D3 Copyright © Ericsson AB 2016. All rights reserved. No part of this document may be reproduced in any form without the written permission of the copyright owner. Disclaimer The contents of this document are subject to revision without notice due to continued progress in methodology, design and manufacturing. Ericsson shall have no liability for any error or damage of any kind resulting from the use of this document. Trademark List All trademarks mentioned herein are the property of their respective owners. These are shown in the document Trademark Information. 130/221 04-LZA 701 6014/1 Uen D3 | 2017-01-27 Contents Contents 1 Introduction 1 1.1 Basic Characteristics 1 1.2 Uplink Coordinated Multi-Point Reception Summary 1 2 Feature Operation 2 2.1 Network Requirements 2 2.2 Hardware Configurations 3 2.3 Process Steps 4 3 Parameters 5 3.1 Feature Configuration Parameters 5 3.2 Affected Parameters 6 4 Network Impact 7 5 Associated Features and Affected Functions 8 5.1 Prerequisite Features 8 5.2 Affected Features 8 5.3 Related Features 8 5.4 Affected System Functions 8 6 Performance 9 6.1 KPIs 9 6.2 Counters 9 6.3 Events 9 7 Activate Uplink Coordinated Multi-Point Reception 11 8 Deactivate Uplink Coordinated Multi-Point Reception 12 130/221 04-LZA 701 6014/1 Uen D3 | 2017-01-27 Uplink Coordinated Multi-Point Reception 130/221 04-LZA 701 6014/1 Uen D3 | 2017-01-27 Introduction 1 Introduction This document describes the Uplink Coordinated Multi-Point Reception feature and its main benefits and impacts in the LTE RAN. The Uplink Coordinated Multi-Point Reception feature combines antenna signals from multiple sector carriers in different cells to increase uplink throughput, especially for cell-border users. 1.1 Basic Characteristics This section describes the basic characteristics of the feature. Feature name: Uplink Coordinated Multi-Point Reception Product identity: DU Radio Node, see Feature Overview. Baseband Radio Node, see Licensed Feature Overview. Replaces: N/A Dependencies This feature requires the following RAN features to be active: • Interference Rejection Combining This feature affects no other features. 1.2 Uplink Coordinated Multi-Point Reception Summary This feature increases the cell-border users uplink throughput by increasing the received signal power and receive diversity. The cell-border user uplink throughput gains depend on the load and scenario. The gain is significant in a scenario where the UE is connected to a macro cell being close to a micro cell. 130/221 04-LZA 701 6014/1 Uen D3 | 2017-01-27 1 Uplink Coordinated Multi-Point Reception 2 Feature Operation This section describes the Uplink Coordinated Multi-Point Reception feature in more detail, including network configuration requirements and operation flows. In this feature, the operator can configure several sector carriers from different cells in an Uplink Coordinated Multi-Point Reception (UL CoMP) group. The feature adaptively selects two sector carriers (a primary one and a secondary one) to receive signals from a UE. When a UE is on the border between two cells, the combinations of the two selected sector carriers can increase the UE uplink throughput. Figure 1 provides an overview of the feature concept. UE1 UE1 UE2 UE2 Disabling UlComp group Enabling UlComp group L0000931A Figure 1 Overview Concept of the Feature The two sector carriers to combine are selected as follows: • The primary sector carrier is the one in the serving cell of the UE. • The secondary one is the best of the others in the same UL CoMP group. This feature works on the Physical Uplink Shared Channel (PUSCH), but not on the Physical Random Access Channel (PRACH) or the Physical Uplink Control Channel (PUCCH). This feature is not supported in the micro RBS. 2.1 Network Requirements This is a licensed feature. For the feature to be operational, a valid license key must be installed and the feature must be activated by setting a MOM attribute. The following must be fulfilled at feature activation: 2 130/221 04-LZA 701 6014/1 Uen D3 | 2017-01-27 Feature Operation • The Uplink Coordinated Multi-Point Reception feature license must be activated. Information about licenses is found in License Management • The class UlCompGroup MO and the class SectorCarrier MO must be configured. • At least one SectorCarrier complies to the 5+5 MHz Sector Carrier license requirement. Note: 2.2 If sector carriers of an UL CoMP group belong to capacity cells with Cell Sleep Mode feature enabled, the UL CoMP group can be disabled or degraded as those cells enter cell sleep mode. Hardware Configurations This section describes the hardware configurations of this feature. 2.2.1 Baseband Capacity Table 1 lists the baseband capacity of the Uplink Coordinated Multi-Point Reception feature. Table 1 Baseband Capacity Maximum Number of Antenna Streams Maximum Number of Combinin g Antennas in One UL CoMP Group Maximum Antenna Bandwidt h Maximum Maximum Number of Channel Evaluated Bandwith Sectors DUS 31 24 8 240 MHz(1) 6 20 MHz DUS 41 24 8 480 MHz(1) 12 20 MHz BB5212 48 8 480 MHz 12 20 MHz BB5216 72 8 960 MHz 18 20 MHz (1) For DUS 31/DUS41, the evaluated antenna bandwidth aligns with corresponding release capacity. 2.2.2 Sector Carrier Configuration This feature supports the following sector carrier combination scenarios: • 1 RX sector carrier + 1 RX sector carrier 130/221 04-LZA 701 6014/1 Uen D3 | 2017-01-27 3 Uplink Coordinated Multi-Point Reception • 2 RX sector carrier + 1 RX sector carrier • 2 RX sector carrier + 2 RX sector carrier • 4 RX sector carrier + 1 RX sector carrier • 4 RX sector carrier + 2 RX sector carrier • 4 RX sector carrier + 4 RX sector carrier When configuring sector carriers for this feature, consider the following conditions: 2.3 • In a UL CoMP group, all the sector carriers are configured in the same Digital Unit (DU) or Baseband unit and share the carrier frequency and bandwidth. • A sector carrier can be included in only one UL CoMP group. • A sector carrier already included in a combined cell is not allowed to be added in a UL CoMP group. Process Steps This section describes the main process steps for the feature function. To indicate that Uplink Coordinated Multi-Point Reception feature is possible, the operator must check configurations of the RBS in the following way: 4 • Licenses described in Network Requirements on page 2 are installed and operable. See License Managementfor details. • A UlCompGroup MO instance is added successfully and a set of SectorCarriers references are added in the instance. • The UlCompGroup MO instance is unlocked. This is identified by the following parameters of the instance: – administrativeState is UNLOCKED – operationalState is ENABLED – availabilityStatus is NO STATUS or DEGRADED • A sector carrier can be added or removed only when the UlCompGroup MO instance administrativeState is LOCKED. • A UL CoMP group can only be deleted, when this group is locked. 130/221 04-LZA 701 6014/1 Uen D3 | 2017-01-27 Parameters 3 Parameters This section describes parameters introduced by the Uplink Coordinated MultiPoint Reception feature and parameters affected by activating the feature. For information about parameter limitations, see Parameter and Counter Limitations. 3.1 Feature Configuration Parameters Table 2 describes the feature parameters. Table 2 Introduced Parameters Parameter Description ulForcedTimingAdvanceComman d Forced extra value for Timing Advance Command in Random Access Response according to 3GPP TS 36.213. In a HetNet scenario, the timing of the UL reception may be different between macro and small cell. This is due to the difference in the DL power level which could result the UE being closer to the small cell than the macro cell (for example, handover point). ulForcedTimingAdvanceCommand increases the timing advance on the small cell (lower output power) so the UL signal could be received from both reception points (macro + small) at the same time. If d = distance (in km) between the antennas of the small cell and the nearest macro cell of the same UL-CoMP group. When d ≤ 300m, number of timing advances = ulForcedTimingAdvanceCommand = 0 When d> 300m, ulForcedTimingAdvanceCommand = [6.4×dkm] where [.] means round to the nearest integer. UL arrives faster due to shorter pathloss in Micro Cell d1 d2 L0001234A The counter pmCompUlToADiffDistr can be used to identify the necessity of configuring ulForcedTimingAdvanceCommand. If majority of small cells pmCompUlToADiffDistr samples are < −2µs or> 2µs, then need to set ulForcedTimingAdvanceCommand accordingly. SectorCarrierRef Defines a set of sectorCarriers. UL CoMP of antenna signals is possible only between antenna signals from sectorCarrierswithin the same set of sectorCarriers. There must be at least one sectorCarrier per UlCompGroup. The UL CoMP group becomes disabled or degraded in some fault situations, see Table 3. 130/221 04-LZA 701 6014/1 Uen D3 | 2017-01-27 5 Uplink Coordinated Multi-Point Reception Table 3 States for UlCompGroup operationalState availabilityStatus Comments Enabled NO_STATUS The UL CoMP group is doing the joint processing of the sector carriers. DEGRADED An uplink part of a SectorCarrier resource in the UlCompGroup becomes disabled or degraded. DEPENDENCY_LOCKED All referenced SectorCarriers Operational States become Disabled and have AvailabilityStatus being Offline or DependencyLocked. DEPENDENCY_FAILED All referenced SectorCarriers Operational States become Disabled and have AvailabilityStatus being Failed or Dependency_Failed. FAILED The Uplink Coordinated Multi-Point Reception optional feature or Interference Rejection Combing optional feature Service State, or both, become Inoperable. Disabled Not all the configuration conditions as described in Hardware Configurations on page 3 are fulfilled. 3.2 Affected Parameters The implementation of this feature affects no parameters. 6 130/221 04-LZA 701 6014/1 Uen D3 | 2017-01-27 Network Impact 4 Network Impact The implementation of this feature has no impact on the network. 130/221 04-LZA 701 6014/1 Uen D3 | 2017-01-27 7 Uplink Coordinated Multi-Point Reception 5 Associated Features and Affected Functions This section describes how the Uplink Coordinated Multi-Point Reception feature affects other features and functions. 5.1 Prerequisite Features Table 4 lists prerequisite features to the Uplink Coordinated Multi-Point Reception feature, that is, they must be active before introducing the feature. Table 4 5.2 Prerequisite Features Feature Description Interference Rejection Combining Interference Rejection Combining (IRC) is a method for antenna combining and is superior to Maximum Ratio Combining (MRC) when suppressing interference on received signals. Affected Features This feature affects no other feature. 5.3 Related Features This feature is not related to any other feature. 5.4 Affected System Functions This feature affects no system functions. 8 130/221 04-LZA 701 6014/1 Uen D3 | 2017-01-27 Performance 6 Performance This section describes performance indicators, counters, and events associated with the Uplink Coordinated Multi-Point Reception feature. 6.1 KPIs This feature has no associated Key Performance Indicator (KPI). 6.2 Counters Table 5 lists the counters associated with this feature. Table 5 Counters Counter Description FDD only: EUtranCellFDD.pmCompUlDeltaSinr PuschDistr TDD only: EUtranCellTDD.pmCompUlDeltaSinr PuschDistr Distribution of the SINR difference for PUSCH between multipoint and single-point reception pmCompUlToADiffDistr Distribution of observed time-of-arrival difference between sectorCarriers. More information about counters can be found in Managed Object Model (MOM). 6.3 Events Table 6 lists the events associated with this feature. Table 6 Events Event Event Parameter Description INTERNAL_PER_RADIO_U E_MEASUREMENT INTERNAL_PER_UETR_RA DIO_UE_MEASUREMENT INTERNAL_PER_CELL_TR AFFIC_REPORT INTERNAL_PER_UETR_CE LL_TRAFFIC_REPORT EVENT_PARAM_DELTA_SINR_MEA S_PUSCH_0 Number of samples for the measured DeltaSINR on PUSCH =< -2 dB EVENT_PARAM_DELTA_SINR_MEA S_PUSCH_1 Number of samples for the measured DeltaSINR on PUSCH in range]-2..0] dB EVENT_PARAM_DELTA_SINR_MEA S_PUSCH_2 Number of samples for the measured DeltaSINR on PUSCH in range]0..2] dB EVENT_PARAM_DELTA_SINR_MEA S_PUSCH_3 Number of samples for the measured DeltaSINR on PUSCH in range]2..4] dB 130/221 04-LZA 701 6014/1 Uen D3 | 2017-01-27 9 Uplink Coordinated Multi-Point Reception Event Event Parameter Description EVENT_PARAM_DELTA_SINR_MEA S_PUSCH_4 Number of samples for the measured DeltaSINR on PUSCH in range]4..6] dB EVENT_PARAM_DELTA_SINR_MEA S_PUSCH_5 Number of samples for the measured DeltaSINR on PUSCH in range]6..8] dB EVENT_PARAM_DELTA_SINR_MEA S_PUSCH_6 Number of samples for the measured DeltaSINR on PUSCH in range]8..10] dB EVENT_PARAM_DELTA_SINR_MEA S_PUSCH_7 Number of samples for the measured DeltaSINR on PUSCH>10 dB For a full list with detailed information about PM events, see the list files in the List Files library folder. 10 130/221 04-LZA 701 6014/1 Uen D3 | 2017-01-27 Activate Uplink Coordinated Multi-Point Reception 7 Activate Uplink Coordinated Multi-Point Reception Prerequisites • The license key is installed in the node. • Continuous Cell Trace Recording (CCTR) is activated since at least one week. This ensures there is troubleshooting data available if something goes wrong. Steps 1. Set the attribute featureState to ACTIVATED in the applicable MO instance, depending on node type: Node Type License Control MO DU Radio Node OptionalFeatureLicense=UlComp Baseband-based Node FeatureState=CXC4011444 After This Task Let the CCTR be active for one week, for continued collection of troubleshooting data. 130/221 04-LZA 701 6014/1 Uen D3 | 2017-01-27 11 Uplink Coordinated Multi-Point Reception 8 Deactivate Uplink Coordinated Multi-Point Reception Prerequisites Continuous Cell Trace Recording (CCTR) is activated since at least one week. This ensures there is troubleshooting data available if something goes wrong. Steps 1. Set the attribute featureState to DEACTIVATED in the applicable MO instance, depending on node type: Node Type License Control MO DU Radio Node OptionalFeatureLicense=UlComp Baseband-based FeatureState=CXC4011444 After This Task Let the CCTR be active for one week, for continued collection of troubleshooting data. 12 130/221 04-LZA 701 6014/1 Uen D3 | 2017-01-27
