05 12 RA41155EN162GLA0 LTE1203 LBPS With Path Switch Off FL16
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05 12 RA41155EN162GLA0 LTE1203 LBPS With Path Switch Off FL16...
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Nokia Academy LTE1203 – Load-based Power Saving with Tx Path Switching Off RA4115 FL16 Feature Overview
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LTE1203 – Load-based Power Saving with Tx Path Switching Off Agenda Feature Overview Configuration and Testing Test Results Operational Hints and Guidelines
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Page: 3 Number: 1 Author: Presenter Subject: Presentation Notes Date: 2/4/2016 5:42:33 AM The LTE1203 – Load-based Power Saving with Tx Path Switching Off feature provides energy saving modes, in case of a low-load period, for cells configured for MIMO operations in the LTE technology.
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Feature Overview LTE1203 – Load-based Power Saving with Tx Path Switching Off The LTE1203 – Load-based Power Saving with Tx Path Switching Off feature provides energy saving modes, in case of a low-load period, for cells configured for MIMO operations. The cells in the eNB can be grouped for power saving mode. These power group cells have the same coverage and the load-based power saving cell switch off order (lbpsCellSOOrder) parameter defines the order in which the power group cells are switched off. Benefits of the feature: • Power saving during off-peak hours, which results in OPEX savings by: • Monitoring of the system to increase or reduce capacity as required, • Efficiently limiting capacity based on load that allows to switch off paths of the system, • Reduction of the capacity of each power group to only that which is required by the UEs being serviced by the commercial system, • Provides history of the power saving mode events for each eNB resource that is controlled by the LTE1203 feature.
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Feature Overview Functional Description – Monitor Load Based Power Saving (LBPS; LTE1103, FL15A) • The eNB monitors the load in the served cells and triggers cell switch off once all of the following conditions are met: -
During the time of the day defined by the user for cell switch off. There are no ongoing emergency calls and no queued messages for Earthquake and Tsunami Warning System (ETWS) or Commercial Mobile Alert System (CMAS) in the cell. The complete load of the cells in the power saving group is below the low load threshold (evaluation period 5 minutes). The estimated complete load immediately after cell switch off for the remaining active cells in the power saving group does not exceed the high load threshold.
• A cell that is being shutdown will utilize the LTE914 Graceful Cell Shutdown feature to ramp down power to allow UE to HO prior to being shut off. • The cell is barred before it is switched off in the eNB. The traffic is moved to other cells during cell switch off. The eNB turns the power amplifier to standby mode.
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Feature Overview Functional Description – Monitor Load Based Power Saving (LBPS; LTE1103, FL15A) 40
PSM = notEnergySavings (03:55)
35
PSM = energySavings (01:15)
30
PSM = notEnergySavings (05:10)
PSM = energySavings (01:15)
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Operator Enabled? 20
Off-Threshold On-Threshold
15 10 5
Actual Load
Operator set: Load-Based Power Savings Period Start (01:05)
Operator set: Load-Based Power Savings Period Stop (05:10)
0:00 0:10 0:20 0:30 0:40 0:50 1:00 1:10 1:20 1:30 1:40 1:50 2:00 2:10 2:20 2:30 2:40 2:50 3:00 3:10 3:20 3:30 3:40 3:50 4:00 4:10 4:20 4:30 4:40 4:50 5:00 5:10 5:20 5:30 5:40 5:50 6:00
0
Example of power saving mode operation in the eNB 7
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Feature Overview LTE1203 – Load-based Power Saving with Tx Path Switching Off The LTE1203 – Load-based Power Saving with Tx Path Switching Off feature uses separate minimum and maximum load thresholds to support different default values from those defined in the LTE1103 – Load-based Power Saving for Multi-layer Networks feature. The LTE1203 feature calculates the power group load using the offset cell capacity of reduced Tx path cells.
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Page: 7 Number: 1 Author: Presenter Subject: Presentation Notes Date: 2/4/2016 5:42:35 AM Each eNB independently decides the power saving state of its power group cells. LTE1203 does not support any X2 data exchange between eNBs. LTE1203 uses the same power group and cell switch off order parameters, the same power group and cell switch-off order determination algorithms, the same last cell switch off enabled parameter, and the same load counters that are defined for LTE1103. In order to support different default values, LTE1203 uses separate minimum and maximum load thresholds than those defined for LTE1103. LTE1203 will also need to modify the load calculations based on cell capacity of reduced TX path cells
Feature Overview LTE1203 – Feature relationships
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Feature Overview LTE1203 – Load-based Power Saving with Tx Path Switching Off The cells in the eNB can be grouped for power saving mode. These power group cells have the same coverage and the load-based power saving cell switch off order (lbpsCellSOOrder) parameter defines the order in which the power group cells are switched off. For power groups with cells that are configured for the NxN MIMO operation mode, the operator can activate the LTE1203 feature to save energy during a low load by switching off a set of cell’s Tx paths.
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Page: 9 Number: 1 Author: Presenter Subject: Presentation Notes Date: 2/4/2016 5:42:35 AM When the resulting number of Tx antennas in the power saving mode is 2, each antenna must correspond to a different polarization. The reduction of transmission antennas also affects the available set of transmission modes. In case precoding vector switching (PVS) was activated in a cell for the primary synchronization signal (PSS)/secondary synchronization signal (SSS) and/or positioning reference signal (PRS), proper coding will be applied in the 2Tx cell. If a cell was modified to the 1Tx mode, PVS cannot be used. For the 2Tx or 4Tx cells, the UEs needs to reconnect, and the best transmission modes will be used from the available ones at the target number of Tx antennas. When exiting the power saving mode, transmission on the previously muted antennas will resume with normal functionality after a cell reset.
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Feature Overview LTE1203 – Load-based Power Saving with Tx Path Switching Off
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Page: 10 Number: 1 Author: Presenter Subject: Presentation Notes Date: 2/4/2016 5:42:35 AM Multi-layer coverage areas with TX paths switched off: UEs at the edge of the impacted cell experience a drop in signal strength. These UEs may initiate hand over to neighboring cells with a better signal strength. The load is increased at the neighboring cells, but the overall power group load is maintained if the handover is to another cell in the power group. UEs at the new edge of the impacted cell experience a slight drop in signal strength; the drop is not sufficient to initiate handover. UEs at the center of the power group coverage area; if too many UEs hand over from the impacted power group cell to other cells serving the same coverage area, then load equalization may redistribute some UEs at the center of the other power group cells into the impacted power group cell. Multi-layer coverage areas with TX paths switched on: UEs at the edge of the impacted cell experience an improved signal strength. UEs at the new edge of the impacted cell experience an increase in the signal strength of the impacted cell. Depending on UE measurements, UEs may hand over into the impacted cell. There is no impact on the UEs at the center of the power group coverage area.
Feature Overview Feature Interdependencies The following features must be deactivated before activating the LTE1203 feature: • LTE1542: FDD SuperCell • LTE1709: Liquid Cell Carrier aggregation (CA) is affected in the following manner: • For 4TX and 2TX cells, the cell is reset when the cell transitions into or out of reduced energy saving. Thus, if the cell is the Pcell, the UE disconnects from the Pcell. In this case, the Pcell and assigned Scells are no longer allocated for CA. If the cell is an Scell, the UE disconnects from the Scell and CA may continue to be allocated for the Pcell and other Scells.
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Management Data New Performance Measurement Counters • New Counters by LTE1203 Counter ID
Counter name
Measurement
M8020C9
Number of samples when the cell is in reduced TX power saving mode
8020 - LTE Cell Availability
M8020C10
Number of cell state changes to reduced TX power saving mode
8020 - LTE Cell Availability
• Counters modified by LTE1203
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Fault ID
Counter name
Measurement
M8020C2
Number of cell state changes to unplanned unavailable
8020 - LTE Cell Availability
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Management Data New Parameters introduced by LTE1203 • New Parameters
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Parameter Name
Abbreviated Name
Managed Object
Activate load-based reduced TX power saving
actLBRTXPowerSaving
LNBTS
Load-based power saving last cell reduced TX min load
lbpsLastCellRTXMinLoad
PSGRP
Load-based power saving reduced TX cell capacity offset
lbpsRTXCellCapOffset
PSGRP
Load-based power saving reduced TX maximum load
lbpsRTXMaxLoad
PSGRP
Load-based power saving reduced TX minimum load
lbpsRTXMinLoad
PSGRP
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Page: 13 Number: 1 Author: Presenter Subject: Presentation Notes Date: 2/4/2016 5:42:36 AM Note: Whether the LTE1203: Load-based Power Saving with Tx Path Switching Off feature acts on all cells or just the lowest layer depends both on the actLBPowerSaving and actLBRTXPowerSaving parameter.
Management Data Parameters already introduced by LTE1103 (FL15A)
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Full name
Abbreviated name
Managed object
Structure
Activate load-based power saving
actLBPowerSaving
LNBTS
-
Energy saving state
energySavingState
LNCEL
-
Load-based power saving iSON control enabled
lbpsISONCtlEnabled
PSGRP
-
Load-based power saving last cell minimum load
lbpsLastCellMinLoad
PSGRP
-
Load-based power saving last cell switch off enabled
lbpsLastCellSOEnabled
PSGRP
-
Load-based power saving maximum load
lbpsMaxLoad
PSGRP
-
Load-based power saving minimum load
lbpsMinLoad
PSGRP
-
Load-based power saving PDCCH load offset
lbpsPdcchLoadOffset
PSGRP
-
Full name
Power saving group identifier
psGrpId
PSGRP
-
Load-based power saving cell list
lbpsCellList
PSGRP
-
Load-based power saving cell switch off order
lbpsCellSOOrder
PSGRP
lbpsCellList
LTE cell configuration identifier
lnCelId
PSGRP
lbpsCellList
Load-based power saving period list
lbpsPeriodList
PSGRP
-
Load-based power saving day of week
lbpsDayOfWeek
PSGRP
lbpsPeriodList lbpsPeriodList
Load-based power saving duration
lbpsDuration
PSGRP
Load-based power saving start time hour
lbpsStartTimeHour
PSGRP
lbpsPeriodList
Load-based power saving start time minute
lbpsStartTimeMinute
PSGRP
lbpsPeriodList
Load-Based Power Saving Suspended
lbpsSuspended
PSGRP
lbpsPeriodList
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Configuration and Testing Activation of the LTE1203 and LTE1103 features, respectively
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Configuration and Testing Activation of the LTE1203 feature – Creating a Power Saving Group (similar to LTE1103)
New parameters introduced by LTE1203 – used in LTE1103 and LTE1203 17
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Page: 16 Number: 1 Author: Presenter Subject: Presentation Notes Date: 2/4/2016 5:42:37 AM Load-based power saving reduced TX cell capacity offset (lbpsRTXCellCapOffset): Defines the percent cell throughput at a reduced TX path cell relative to the full TX path cell throughput expected due to the change in supported transmission mode due to reduction in cell TX paths. The cell throughput is expected to decrease due to the change in supported transmission mode by the cell with reduced TX paths. Load-based power saving reduced TX maximum load (lbpsRTXMaxLoad): Defines the high-watermark for the aggregate load of a power group for reduced TX power saving. Load-based power saving reduced TX minimum load (lbpsRTXMinLoad): Defines the low-watermark for the aggregate load of a power group for reduced TX power saving. The eNB will switch off TX paths of a power group cell in cell switch off order if the aggregate power group load is less than the low-watermark for reduced TX power saving value of lbpsRTXMinLoad for a minimum duration and the expected aggregate power group load for the reduced aggregate power group capacity is less than the high-water mark for reduced TX power saving value of lbpsRTXMaxLoad.
Configuration and Testing Test setup • Equipment: - 1 eNB with minimum two cells operational and on different frequencies. - Wireshark PC to monitor M-plane (for CCN OM messages). - EMIL to monitor RRC messages. - One UE to generate load. - iPerf on UE and application server (optional), can be used to maintain a constant load to determine if cells should be switched on or off. • Configuration: - Enable the feature with the parameter actLBRTXPowerSaving= ‘true’, - Set the other parameters (PSGRP) accordingly,
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Configuration and Testing Test execution • Observe the eNB behavior for the following settings: - Activate only LBPS with Tx Path Switching Off (Activate only LTE1203); - Attach a UE to one cell and generate some load; RRC indicates TM4; - After a certain time (defined by the operator), one cell goes to „Reduced Energy Saving“ and RRC indicates TM1. - Activate (in addition to LTE1203) also the LTE1103 feature (LBPS). - Observe the different eNB behavior for the two features.
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Test Results Cell#1 in “Reduced Energy Saving” state
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Page: 19 Number: 1 Author: Presenter Subject: Presentation Notes Date: 2/4/2016 5:42:38 AM As soon as the configured Power Saving Start time is reached, the eNB turns OFF one MIMO path and the cell changes the status to „Reduced Energy Saving“. A couple of seconds later, the cell chages its state to „Disabled“ and shortly later (1 sec) back to „Enabled“. Thus leads to a new call trace in EMIL, now indicating the transmission mode TM1 (Single Transmission without MIMO).
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Test Results Cell#2 is “Not Energy Saving”
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Page: 20 Number: 1 Author: Presenter Subject: Presentation Notes Date: 2/4/2016 5:42:38 AM While Cell #1 changed its state to „Reduced Energy Saving“ the other cell of the eNB stays in the state „Not Energy Saving“.
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Test Results BOTH cells in “Reduced Energy Saving” states – accompanied with Alarms
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Page: 21 Number: 1 Author: Presenter Subject: Presentation Notes Date: 2/4/2016 5:42:38 AM Without changing anything and waiting further 5 minutes, the other cell (#2) also goes to „Reduced Energy Saving“ – accompanied by 2 faults: Fault #4003: „Transmission Path Failure“ Fault #4090: „Cell power failure“
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Test Results Wireshark traces
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Page: 22 Number: 1 Author: Presenter Subject: Presentation Notes Date: 2/4/2016 5:42:39 AM Delta CCN true 1 1 2 2 Fri 15 13 45 notSuspended 680
Test Results EMIL traces: Initial rrcConnectionReconfiguration
}, antennaInfo explicitValue : { transmissionMode tm4, codebookSubsetRestriction n2TxAntenna-tm4 : '111111'B, ue-TransmitAntennaSelection release : NULL } }
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Test Results EMIL traces: Later rrcConnectionReconfiguration
}, antennaInfo explicitValue : { transmissionMode tm1, ue-TransmitAntennaSelection release : NULL } }
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