Carrier Aggregation
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USER DESCRIPTION
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Copyright
© Ericsson AB 2013-2014. All rights reserved. No part of this document may be
reproduced in any form without the written permission of the copyright owner.
Disclaimer
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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
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All trademarks mentioned herein are the property of their respective owners.
These are shown in the document Trademark Information.
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Contents
Contents
Introduction
1
1.1
Basic Characteristics
1
1.2
Benefits
1
1.3
Additional Information
2
Feature Operation
2.1
Network Requirements
2.2
Feature Overview
2.3
Bandwidths Supported by Carrier Aggregation
4
2.4
Inter-Band Aggregation
4
2.5
Intra-Band Aggregation
2.6
Secondary Cell Configuration
5
2.7
Secondary Cell De-Configuration
5
2.8
Dynamic Secondary Cell Activation and Deactivation
6
2.9
Downlink Data Transmission on Multiple Carriers
7
2.10
Carrier Aggregation up to 40 MHz
8
2.11
Supplemental Downlink for Carrier Aggregation
8
2.12
Dynamic SCell Selection for Carrier Aggregation
8
2.13
Limiting the Number of CA Users
9
2.14
3CC DL Carrier Aggregation Extension
10
3
Parameters
11
3.1
Feature Configuration Parameters
11
3.2
Affected Parameters
12
4
Network Impact
13
4.1
Capacity and Throughput
13
4.2
Mobility
13
5
Associated Features and Affected Functions
15
5.1
Prerequisite Features
15
5.2
Affected Features
15
5.3
Related Features
15
5.4
Affected System Functions
16
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1
3
3
3
5
Carrier Aggregation
Performance
17
6.1
KPIs
17
6.2
Counters
17
6.3
Events
18
7
O&M Information
21
7.1
Feature Activation and Deactivation
21
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Introduction
1
Introduction
1.1
Basic Characteristics
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This document describes the Carrier Aggregation (CA) feature and its main
benefits and impacts in the LTE RAN. This feature is specified by 3GPP.
This section describes the basic characteristics of the feature.
Feature name:
Carrier Aggregation
Product identity:
Replaces:
N/A
Dependencies
IN
See Feature Overview
•
Benefits
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1.2
Scheduler
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This feature affects the following RAN features:
PR
The benefit of the Carrier Aggregation feature is that it enables data to be
simultaneously transmitted on two bands to a single User Equipment (UE). The
main benefits of Carrier Aggregation are:
1.3
•
Increased downlink speed across the coverage area
•
More efficient use of scattered spectrum
•
Higher capacity
Additional Information
More information about this feature and related topics can be found in the
following documentation:
•
3GPP TS 36.331 v 10.5.0
•
3GPP TS 36.321 v 10.5.0
•
3GPP TS 36.213 v 10.5.0
•
Dynamic SCell Selection for Carrier Aggregation
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1
Carrier Aggregation
Supplemental Downlink for Carrier Aggregation
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Feature Operation
2
Feature Operation
This section describes the Carrier Aggregation feature in more detail, including
network configuration requirements and operation flows.
Network Requirements
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2.1
This is a licensed feature. This means that for the feature to be operational, a
valid license key must be installed and the feature must be explicitly activated
by setting a MOM attribute. See Section 7.1 on page 21.
The following must also be fulfilled at feature activation:
•
The UE must support Carrier Aggregation, release 10 or later, in order
to benefit from it.
IM
IN
The sCellCandidate parameter must be configured to ALLOWED, which
means that aggregation is allowed between the EUtranCellFDD and
the EUtranCellRelation cell. Only one EUtranCellRelation per
EUtranCellFDD can have parameter sCellCandidate set to ALLOWED.
Feature Overview
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2.2
•
The Carrier Aggregation feature supports the following characteristics:
Carrier Aggregation for FDD
•
Up to two downlink component carriers
•
Statically configured secondary component carrier
•
Single uplink component carrier
•
Dynamic activation or deactivation of secondary component carriers
•
Aggregated cells located on the same Digital Unit (DU)
•
No cross-carrier scheduling
•
Inter-band aggregation
•
Non-contiguous intra-band carrier aggregation
•
Intra- and Inter-LTE Mobility
PR
•
Figure 1 shows the UE configuration supported by Carrier Aggregation. The
only configuration that is supported is the asymmetric two downlink carrier and
one uplink carrier. For a release-8 or -9, or both UEs, each carrier configuration
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3
Carrier Aggregation
appears as an LTE release-8 carrier, whereas a UE capable of Carrier
Aggregation can exploit the total aggregated bandwidth for the two downlink
carrier configurations. For more details about Carrier Aggregation configuration
and setup of secondary carriers, refer to 3GPP TS 36.331.
Rel-8 behaviour
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Rel-10 behaviour
Downlink
Uplink
L0000724A
UE configurations supported by Carrier Aggregation. The left-hand
figure shows the asymmetric two-downlink and one-uplink case.
The right-hand figure shows the legacy case.
IN
Figure 1
Bandwidths Supported by Carrier Aggregation
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2.3
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A UE configured for carrier aggregation has one Primary Cell (PCell) and one
Secondary Cell (SCell). The PCell is the cell where the UE is connected, has
established the Radio Resource Control (RRC) connection, and is operating on
the primary frequency. The SCell operates on a secondary frequency and can
be configured once the RRC connection is established.
2.4
PR
Bandwidth support for Carrier Aggregation can be up to an aggregated
bandwidth of 40 MHz. For specific bandwidth combinations per band
combination, see 3GPP TS 36.101.
Inter-Band Aggregation
The Carrier Aggregation feature supports inter-band aggregation, that is,
carriers on different frequency bands, as shown in Figure 2.
1 CC
Frequency band A
1 CC
Frequency band B
L0000725A
Figure 2
4
Inter-Band Carrier Aggregation
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Feature Operation
2.5
Intra-Band Aggregation
The Carrier Aggregation feature supports intra-band aggregation, that is,
carriers on the same frequency band.
2.5.1
Non-Contiguous Intra-Band Carrier Aggregation
1 CC
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For non-contiguous carrier aggregation, the carriers are located within the
same band with some spectrum of uncoordinated operation between them, for
example spectrum owned by another operator.
1 CC
Figure 3
L0000954A
Non-Contiguous Intra-Band Carrier Aggregation
Secondary Cell Configuration
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2.6
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Frequency band A
PR
The operator decides which cells can be aggregated, by manually configuring
cells for a specific EUtranCellFDD PCell, and another EUtranCellFDD
that can be used as a secondary cell (SCell) for the carrier aggregation UE.
Parameter sCellCandidate for the SCell must be set.to enable successful
configuration by UEs capable of Carrier Aggregation.
At attach during reestablishment and incoming handover for either inter- or
intra-frequency, the eNodeB checks the CA license, the CA neighbor cell
configuration, that is, the SCell candidate, as well as the UE capability. If all the
conditions are fulfilled, the CA UE is configured with one Downlink (DL) SCell
in the same RRCConnectionReconfiguration message required for the
attach or outgoing handover reconfiguration to complete.
2.7
Secondary Cell De-Configuration
The SCell is always deconfigured at incoming handover.
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Carrier Aggregation
2.8
Dynamic Secondary Cell Activation and Deactivation
To facilitate UE battery saving, the Carrier Aggregation feature supports SCell
dynamic activation and deactivation.
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DL transmissions on an SCell are only possible if it is activated. If it is
deactivated although still configured, no transmissions are possible on that
carrier. The UE does not monitor the deactivated component carrier. This
results in UE battery saving.
Dynamic activation and deactivation ensures that the SCell is only activated
when there is DL data demand that could benefit from transmitting on more
than just one carrier. Furthermore, the activated SCell is only used for DL
transmissions if the SCell DL channel quality is above a certain threshold. The
SCell is deactivated either if the DL data demand drops to such an extent that it
can be handled through only one component carrier, or when the DL channel
quality of the activated SCell stays below a threshold for a certain time.
IN
To avoid a ping-pong effect of activation or deactivation, a timer is started
whenever a state change from deactivated to activated or from activated to
deactivated is triggered. No new state change is allowed until the timer expires.
Secondary Cell Activation or Deactivation Triggers
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2.8.1
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More details of the SCell activation or deactivation and its triggers are described
in the following sections.
The following conditions must be met so that SCell activation or deactivation
can take place:
The UE’s configured SCell can only be activated when the associated
cell is unlocked.
PR
Note:
•
Need-based: Allow activation or deactivation of the SCell based on the
amount of data available in the Radio Link Control (RLC) buffer.
•
Coverage-based: Allow deactivation of the SCell based on poor channel
quality.
Note:
•
6
An activated SCell is only used for transmission if it has good
channel quality.
Prohibit Timer: To avoid a ping-pong effect, allow activation or deactivation
of the SCell if the timer is not running. The prohibit timer must be started
whenever either activation or deactivation is triggered. No new activation or
deactivation can be triggered while the timer is running.
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Feature Operation
2.8.2
Secondary Cell Activation
Upon successful configuration after RRCConnectionReconfiguration was
received, an SCell can be activated if the trigger conditions are met. See
Section 2.8.1 on page 6.
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SCell activation is achieved through the transmission of an
Activation-Deactivation Medium Access Control (MAC) Control Element
(CE) with the SCell index bit set to one. The eNodeB sends the
Activation-Deactivation MAC CE on a PCell piggy-backed on data. The eNodeB
considers the activation successful when a HARQ ACK detection parameter is
received after the DL burst that carried the Activation-Deactivation MAC CE
occurred. As it is possible to receive a false HARQ ACK detection parameter,
the Activation-Deactivation MAC CE is repeated multiple times.
2.8.3
Secondary Cell Deactivation
IN
Once activated, the UE is polled for SCell channel status information. If the
SCell channel quality is above the specified threshold, DL data transmissions
are allowed on the SCell.
IM
The SCell is only deactivated if one of the conditions from Section 2.8.1 on
page 6 are met, while the prohibit timer is not running. Additional triggers are
described below.
EL
Locking the physical cell associated with the SCell also triggers deactivation
of the SCell.
2.9
PR
SCell deactivation is achieved through the transmission of an
Activation-Deactivation MAC Control Element with the SCell index bit set to
zero. As at activation, the MAC CE is piggy-backed on PCell data and repeated
multiple times. The eNodeB considers the SCell as deactivated when the
first HARQ ACK detection parameter is received after the burst occurred that
contained the Activation-Deactivation MAC CE.
Downlink Data Transmission on Multiple Carriers
The PCell is always active, whereas the SCell is dynamically activated or
deactivated. When a UE has an activated SCell and the DL channel quality
on the SCell is above a specified threshold, DL data can be transmitted over
both carriers. The amount of data sent on each carrier is proportional to the
bandwidth and the DL channel quality of the carrier. Data splitting onto multiple
carriers only occurs if the data to be sent exceeds a specified threshold. If the
amount of data sent does not exceed this threshold, transmission only occurs
on the carrier that could potentially send more data given the constraints of
carrier bandwidth and DL channel quality on the carrier.
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Carrier Aggregation
2.10
Carrier Aggregation up to 40 MHz
Carrier Aggregation increases the peak single User Equipment (UE) throughput
by combining the bandwidth of two downlink carriers. This allows operators
with more than one narrow band to compete favorably with other operators
that have larger bandwidth.
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Carrier aggregation up to 40 MHz expands the maximum bandwidth that can
be aggregated. Using this functionality, it is possible to support two carriers
with maximum 20 MHz bandwidth each. The 20+20 MHz allocation increases
the peak throughput for a UE up to 300 Mbps. To support 300 Mbps, UE
category 6 or higher is required. For specific bandwidth combinations per
band-combination see 3GPP TS 36.101.
2.11
IN
No new attributes or parameters are introduced to handle the 20+20 MHz
configuration.
Supplemental Downlink for Carrier Aggregation
IM
The Supplemental Downlink for Carrier Aggregation feature makes it possible
to configure a cell as downlink (DL) only and utilize this cell as a secondary cell
for downlink carrier aggregation. A cell normally consists of two Component
Carriers (CC), uplink (UL) and downlink (DL).
EL
Supplemental Downlink for Carrier Aggregation allows a CA-capable UE to
use 1 UL CC and 2 DL CCs.
PR
The UE has one Primary Cell (PCell). This is also the cell to which the UE
is connected from an EPC perspective. The cell that is not the PCell is the
Secondary Cell (SCell).
The main benefits of Supplemental Downlink for Carrier Aggregation are:
•
Spectrum utilization on bands defined as downlink only, for example: Band
29, using Carrier Aggregation
•
Increased downlink User Equipment (UE) peak throughput
•
Increased aggregated downlink throughput and capacity
See Supplemental Downlink for Carrier Aggregation for more information.
2.12
Dynamic SCell Selection for Carrier Aggregation
The Dynamic SCell Selection for Carrier Aggregation feature adds great value
to the capability for the Carrier Aggregation feature to be applicable. In this
feature, coverage measurement reports are introduced, allowing SCell to stay
configured while the UE is under coverage of the configured SCell only.
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Feature Operation
Further, multiple PCell to SCell relationships are supported. This means that a
SCell with sufficiently good coverage among several others can be selected,
configured, and activated at the appropriate moment.
The Dynamic SCell Selection for Carrier Aggregation feature offers the
following benefits:
A cell can have more than one SCell candidate, which can be added or
deleted without having to block or unblock the cell for the change to take
effect.
•
The SCell of a UE is dynamically configured or deconfigured based on two
criteria: L3 measurements and the SCell selection algorithm.
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•
This feature is based on the Carrier Aggregation feature and has the following
additional functionality:
A cell used as PCell can have multiple cells as its SCell candidates.
•
The SCell of an UE is dynamically configured or deconfigured based on
two criteria: L3 measurements and the SCell selection algorithm.
IM
IN
•
See Dynamic SCell Selection for Carrier Aggregation for more information.
Limiting the Number of CA Users
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2.13
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A UE configured with an SCell consumes twice as many resources as a
UE that only has a PCell, yet it is still counted as one connected UE from
a connected UE license perspective. There are two ways to limit the extra
resources consumed by SCells:
•
Limit the total number of SCells configured on the eNodeB via
caUsageLimit, regardless of the number of connected UEs
•
Stop configuring new SCells when the total resource usage on a DU,
the total number of connected UEs + the total number of configured
SCells, exceeds loadingLimit * 100 - caPreemptionThreshold / 100.
By stopping the configuration of new SCells and natural UE attrition, the
number of SCells configured on the eNodeB is indirectly regulated
The loadingLimit is a DU hardware capacity limit which can be found in the
capacity section of the Network Impact Report depending on the DU type.
These two mechanisms work independently of each other. For example, the
eNodeB stops configuring SCells if the number of connected UEs is high, even
though the SCells configured are still below caUsageLimit. Using the correct
caPreemptionThreshold setting, there is a high probability that the licensed
connected user number can be reached at high loading without limiting the
number of CA users at low loading.
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Carrier Aggregation
2.14
3CC DL Carrier Aggregation Extension
The 3CC DL Carrier Aggregation Extension feature enables the capability
to transmit data to a single UE on three carriers simultaneously. The main
benefits of the feature are:
Increase downlink speed across the coverage area.
•
More efficient use of scattered spectrum – possible to combine three
chunks of bandwidth instead of only two.
•
Improve end-user experience by achieving up to 450 Mbps.
Note:
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•
UE category 9 or 10 and 60 MHz aggregated bandwidth is required
to reach the peak throughput of 450 Mbps.
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For more information about the feature, see 3CC DL Carrier Aggregation
Extension.
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Parameters
3
Parameters
This section describes configuration parameters for the Carrier Aggregation
feature and parameters affected by activating the feature.
Feature Configuration Parameters
Table 1 describes the feature parameters.
Table 1
Feature Parameters
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3.1
Description
sCellCandidate
Indicates the secondary component carrier status. The value
indicates whether the cell indicated by MO EUtranCellRelation
can be used as secondary component carrier (SCell) for UEs
using this cell as their primary component carrier (PCell).
sCellActDeactDataThres
If the minimum time needed to transmit all bits in all priority queues
of a UE is higher than this threshold, activation of one or more
secondary cells is considered. Minimum time needed to transmit
all bits is calculated as the number of bits in all priority queues,
divided by the number of bits that can be transmitted in one TTI by
all active serving cells prior to the activation decision, assuming
the UE is given all resources in those cells.
IM
IN
Parameter
If the minimum time needed to transmit all bits in all priority
queues of a UE is lower than sCellActDeactDataThres
minus sCellActDeactDataThresHyst, deactivation of one
component carrier is considered. Minimum time needed to
transmit all bits is calculated as number of bits in all priority
queues, divided by the number of bits that can be transmitted in
one TTI by all active serving cells after deactivation decision,
assuming the UE is given all resources in those cells. This is
computed as though the UE is given all resources in those cells.
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sCellActDeactDataThresHyst
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sCellActDeactProhibitTimer
Activation or deactivation prohibit timer. No new activation or
deactivation of an SCell is allowed while this timer is running.
sCellScheduleSinrThres
No data is scheduled on the SCell if wideband SINR is lower than
sCellScheduleSinrThres. If the SINR persists in staying
below the threshold, the SCell eventually becomes deactivated.
caPreemptionThreshold
Configures the resource consumption margin in percentage,
beyond which secondary cells must not be configured.
caRateAdjustCoeff
This parameter is used to adjust factor of carrier component (CC)
aggregated rate, which is used in scheduler's proportional fairness
algorithm. A smaller value gives CA UE a greater advantage
over non-CA UE.
Value 10 makes the rate as original aggregated rate of all CCs.
Values 9 to 6 make the rate as cell rate plus rate influence from
other CCs in decreased order.
Value 5 makes cell based rate.
Value 4 to 1 make the rate as fraction of the cell rate in decreased
order.
Value 0 makes rate as zero and this is not recommended for
deployments.
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Carrier Aggregation
Description
caUsageLimit
Carrier Aggregation Usage limit. The value configures the number
of SCell connections which can be in use for carrier aggregation.
A secondary cell (SCell) costs in memory the same as a primary
cell (PCell) for each UE.
CarrierAggregationFunction
Id
The value component of the Relative Distinguished Name (RDN).
noOfChannelSelectionSets
The number of channel selection PUCCH resource sets (CS sets)
to reserve in each cell for secondary cell HARQ feedback.
channelSelectionSetSize
Determines the number of Channel Selection (CS) PUCCH
resources in a CS set.
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Parameter
Set to 1 when all SCell candidates are configured with transmission
mode 1.
Set to 2 when at least one SCell candidate is configured with
transmission mode 3 or higher.
Affected Parameters
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3.2
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The implementation of this feature affects no parameters.
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Network Impact
4
Network Impact
4.1
Capacity and Throughput
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This section describes how the Carrier Aggregation feature impacts the network
functions and capabilities.
Each Carrier Aggregation UE with one configured SCell consumes the memory
of two connected users in the system. As a result, the maximum total number
of RRC_CONNECTED users decreases by the number of Carrier Aggregation
UEs connected.
Mobility
IN
4.2
IM
There are no changes to mobility from the previous releases. Mobility is based
on PCell coverage. Refer to 3GPP TS 36.331:
Event A1: Serving values improve to a higher level than threshold level.
•
Event A2: Serving values improve to a higher level than threshold level.
•
Event A3: Neighbor offset values improve to a higher level than PCell
values.
•
Event A5: PCell values deteriorate to a lower level than threshold1 values
and neighbor values improve to a higher level than threshold 2 values
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•
•
Event B1: Inter-RAT neighbor values improve to a higher level than
threshold values.
•
Event B2: PCell values deteriorate to a lower level than threshold1 and inter
RAT neighbor values improve to a higher level than threshold 2 values.
PCell values always change at handover. In the new PCell. the old SCell is
removed and a new SCell is configured even if the SCell is the same. All this
is handled in the same RRCConnectionReconfiguration message at the
handover event.
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Carrier Aggregation
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Associated Features and Affected Functions
5
Associated Features and Affected
Functions
5.1
Prerequisite Features
This feature has no prerequisite features.
Affected Features
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5.2
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This section describes how the Carrier Aggregation feature affects other
features and functions.
This feature affects no other feature.
Related Features
Table 2
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5.3
Related Features
Description
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Feature
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Dynamic SCell Selection for This feature adds great value to the capability
Carrier Aggregation
for the Carrier Aggregation feature to
be applicable. In this feature, coverage
measurement reports are introduced, allowing
SCell to stay configured while the UE is
under coverage of the configured SCell only.
Further, multiple PCell to SCell relationships
are supported, so that a SCell with sufficiently
good coverage among several others can
be selected, configured, and activated at the
appropriate moment.
LTE Broadcast
• A cell activated with one or more
Multicast/Broadcast over Single Frequency
Network (MBSFN) area can be subsequently
configured and activated as an SCell.
• Activation of additional MBSFN areas or
deactivation of MBSFN areas of a cell that
is configured as an SCell, leads to SCell
deactivation.
Supplemental Downlink for
Carrier Aggregation
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This feature introduces the capability of utilizing
a carrier designated as downlink-only, for an
SCell with Carrier Aggregation (CA).
15
Carrier Aggregation
Multiple Frequency Band
Indicators
Carrier Aggregation is affected by the Multiple
Frequency Band Indicators feature. For more
information see Multiple Frequency Band
Indicators.
Carrier Aggregation-Aware
IFLB
When the Carrier Aggregation Aware-IFLB
feature is operable a UE, which when
connecting to a cell that uses a frequency
where the UE’s CA capability is not best
utilized, can be redirected to a target cell on
possibly another frequency with better CA
utilization potential. The feature makes sure to
maintain the UEs CA potential
Affected System Functions
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Description
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5.4
Feature
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This feature affects no system functions.
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Performance
6
Performance
This section describes performance indicators, counters, and events associated
with the Carrier Aggregation feature.
KPIs
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6.1
Table 3 lists the main Key Performance Indicators (KPI) associated with the
Carrier Aggregation feature.
Table 3
Description
Downlink Throughput,
Downlink Throughput per
QCI
Carrier Aggregation can provide end-user downlink throughput
improvement by aggregating the 2 DL CC. Carrier Aggregation can
increase the PDCP throughput in the networks as a PDCP packet can be
sent on multiple cells in parallel. Scheduling flexibility can be increased by
using frequency selectivity.
Downlink Latency, Downlink
Latency per QCI
Latency with Carrier Aggregation support observed over multiple cells is
on par or better than latency without Carrier Aggregation support. When
measured on PDCP, latency is cell agnostic. Total latency depends on the
number of cells used and the available scheduling resources.
IM
Counters
IN
KPI
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6.2
KPIs
Table 4 lists the most important counters associated with the Carrier
Aggregation feature.
Counters
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Table 4
Counter
Description
pmCaCapableDlSum,
pmCaCapableDlSamp
Shows the number of UEs capable of Carrier Aggregation and
their number of corresponding SCells.
pmCaConfiguredDlSum,
pmCaConfiguredDlSamp
Shows the number of configured Carrier Aggregation UEs and
their number of corresponding SCells.
pmCaActivatedDlSum
Shows the number of activated Carrier Aggregation UEs and their
number of corresponding SCells.
pmCaScheduledDlSum
Shows the number of scheduled Carrier Aggregation UEs and
their number of corresponding SCells.
pmRadioThpVolDlSCell
Accumulates data traffic at cell level for UEs that use this cell
as their SCell.
pmRadioThpVolDl
This existing counter is modified to account for SCell traffic.
Accumulates data traffic at cell level for UEs that use this cell
as their PCell or SCell.
pmCaAssignedCsSetsDistr
The number of Channel Selection (CS) resource sets assigned to
UEs sharing this PCell within the HARQ bundling window.
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Carrier Aggregation
More information about counters can be found in Managed Object Model
(MOM) RBS.
6.3
Events
Table 5 list the events associated with the Carrier Aggregation feature.
Events
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Table 5
Event
Event Parameter
Description
INTERNAL_PER_CELL_TR
AFFIC_REPORT
EVENT_PARAM_PER_SCELL_MAC
_DTX_DL_QPSK
INTERNAL_PER_CELL_TR
AFFIC_REPORT
EVENT_PARAM_PER_SCELL_MAC_
DTX_DL_16QAM
INTERNAL_PER_CELL_TR
AFFIC_REPORT
EVENT_PARAM_PER_SCELL_MAC_
DTX_DL_64QAM
The total number of times an
uplink grant was given for HARQ
transmission in the uplink direction
with 64QAM where DTX is
considered to be the reason for
no reception of HARQ in uplink in
the eNodeB. Only the secondary
component carrier traffic the SCell is
included, that is the UE uses another
cell as its primary component carrier
PCell.
INTERNAL_PER_CELL_TR
AFFIC_REPORT
EVENT_PARAM_SCELL_HARQ_DL
_NACK_QPSK
The total number of unsuccessful
HARQ transmissions in the downlink
direction using a QPSK modulation.
Failure is based on the HARQ
NACK from the UE. Only the
secondary component carrier traffic,
the SCell is included, that is the
UE uses another cell as its primary
component carrier PCell.
INTERNAL_PER_CELL_TR
AFFIC_REPORT
EVENT_PARAM_SCELL_HARQ_DL_
NACK_16QAM
The total number of unsuccessful
HARQ transmissions in the
downlink direction using a 16QAM
modulation. Failure is based on the
HARQ NACK from the UE. Only the
secondary component carrier traffic,
the SCell is included, that is the
UE uses another cell as its primary
component carrier PCell.
The total number of times an
uplink grant was given for HARQ
transmission in the uplink direction
with 16QAM, where DTX is
considered to be the reason for
no reception of HARQ in uplink in
the eNodeB. Only the secondary
component carrier traffic, the
SCell is included, that is the UE
uses another cell as its primary
component carrier PCell.
IN
IM
EL
PR
18
The total number of times a
downlink HARQ feedback was not
received from a UE for a Transport
Block where QPSK and DTX are
considered to be the reason. Only
the secondary component carrier
traffic, the SCell is included, that
is the UE uses another cell as its
primary component carrier, PCell.
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Performance
Event Parameter
Description
INTERNAL_PER_CELL_TR
AFFIC_REPORT
EVENT_PARAM_SCELL_HARQ_DL_
NACK_64QAM
The total number of unsuccessful
HARQ transmissions in the
downlink direction using a 64QAM
modulation. Failure is based on the
HARQ NACK from the UE. Only the
secondary component carrier traffic,
the SCell is included, that is the
UE uses another cell as its primary
component carrier PCell.
INTERNAL_PER_CELL_TR
AFFIC_REPORT
EVENT_PARAM_SCELL_HARQ_DL_
ACK_QPSK
The total number of successful
HARQ transmissions in the
downlink direction using a QPSK
modulation. Success is based on
the HARQ ACK from the UE. Only
the secondary component carrier
traffic, the SCell is included, that
is the UE uses another cell as its
primary component carrier PCell.
INTERNAL_PER_CELL_TR
AFFIC_REPORT
EVENT_PARAM_SCELL_HARQ_DL
_ACK_16QAM
INTERNAL_PER_CELL_TR
AFFIC_REPORT
EVENT_PARAM_SCELL_HARQ_DL
_ACK_64QAM
EL
IM
IN
A
R
Y
Event
PR
INTERNAL_PER_CELL_TR
AFFIC_REPORT
INTERNAL_PER_CELL_TR
AFFIC_REPORT
The total number of successful
HARQ transmissions in the
downlink direction using a 16QAM
modulation. Success is based on
the HARQ ACK from the UE. Only
the secondary component carrier
traffic, the SCell is included, that
is the UE uses another cell as its
primary component carrier PCell.
The total number of successful
HARQ transmissions in the
downlink direction using a 64QAM
modulation. Success is based on
the HARQ ACK from the UE. Only
the secondary component carrier
traffic, the SCell is included, that
is the UE uses another cell as its
primary component carrier PCell.
EVENT_PARAM_PER_SCELL_DL_M
AC_DELAY
The aggregated time for the
downlink delay measurement in the
MAC layer with one sample per
MAC SDU. The time recorded for
each sample is the time measured
between RLC PDU packet reception
until the packet is received by the
UE or the HARQ transmission
failure value on this MAC SDU. Only
the secondary component carrier
traffic, the SCell is included, that
is the UE uses another cell as its
primary component carrier PCell.
EVENT_PARAM_SCELL_RADIOTHP
_VOL_DL
The total successfully transferred
data volume on the DL MAC level.
Only the secondary component
carrier traffic, the SCell data is
included, that is the UE uses another
cell as its primary component carrier
PCell.
The total successfully transferred
data volume on MAC level in
the downlink C276. This counter
includes possible padding bits. Only
the secondary component carrier
traffic, the SCell is included, that
is. the UE has another cell as its
primary component carrier PCell.
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19
Carrier Aggregation
Event Parameter
Description
INTERNAL_PER_CELL_TR
AFFIC_REPORT
EVENT_PARAM_SCELL_RADIOTHP
_RES_DL
The total amount of physical
resources used for transmission
in the downlink. All transmissions
whether successful or unsuccessful
are counted. Only the secondary
component carrier traffic, the
SCell is included, that is the UE
uses another cell as its primary
component carrier PCell.
INTERNAL_PER_CELL_TR
AFFIC_REPORT
EVENT_PARAM_PER_SCELL_SCHE
D_ACTIVITY_UE_DL
The sum of the contributions from
each UE in the cell of the number
of ms where SRB/DRB data was
scheduled in the DL for secondary
component carrier traffic. the SCell,
that is the UE uses another cell as
its primary component carrier PCell.
A
R
Y
Event
PR
EL
IM
IN
More information about events can be found in PM Event List.
20
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O&M Information
7
O&M Information
This section provides Operation and Maintenance (O&M) information for the
Carrier Aggregation feature.
Feature Activation and Deactivation
A
R
Y
7.1
This feature license is implemented by the MO instance OptionalFeature
License=CarrierAggregation.
To enable feature operation:
IN
1. Ensure that the corresponding license key is installed by checking that the
licenseState attribute for the feature is set to ENABLED.
2. Activate the feature by setting the attribute featureState to ACTIVATED.
PR
EL
IM
To deactivate the feature, set the attribute featureState to DEACTIVATED.
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21