Uplink Coordinated Multi-Point
Reception
Feature Description
130/221 04-LZA 701 6014/1 Uen G4
Copyright
© Ericsson AB 2016, 2017. All rights reserved. No part of this document may
be reproduced in any form without the written permission of the copyright
owner.
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130/221 04-LZA 701 6014/1 Uen G4 | 2017-08-28
Contents
Contents
1
Uplink Coordinated Multi-Point Reception Overview
1
2
Feature Operation
2
2.1
Network Requirements
2
2.2
Hardware Configurations
3
2.3
Process Steps
4
3
Parameters
6
3.1
Feature Configuration Parameters
6
3.2
Affected Parameters
7
4
Network Impact
8
5
Associated Features and Affected Functions
9
5.1
Prerequisite Features
9
5.2
Affected Features
9
5.3
Related Features
9
5.4
Affected System Functions
9
6
Performance
10
6.1
KPIs
10
6.2
Counters
10
6.3
Events
10
7
Activate Uplink Coordinated Multi-Point Reception
12
8
Deactivate Uplink Coordinated Multi-Point Reception
13
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Uplink Coordinated Multi-Point Reception
130/221 04-LZA 701 6014/1 Uen G4 | 2017-08-28
Uplink Coordinated Multi-Point Reception Overview
1
Uplink Coordinated Multi-Point Reception
Overview
Feature Identity:
FAJ 121 3043
Licensing:
Licensed feature. One license per
node.
Introduced in:
DU Radio Node: L14A
Baseband Radio Node: L15B
Replaces:
N/A
Belongs to:
CoMP, FAJ 801 0442
Summary
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.
The feature increases the uplink throughput of cell-border users by increasing
the received signal power and receive diversity.
The uplink throughput gains of the cell-border users 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.
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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
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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 two SectorCarriers, complying to the 5+5 MHz Sector Carrier
license requirement, must be combined in an UL CoMP group. All
bandwidths are supported.
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
Number of
Evaluated
Sectors
Maxi
mum
Cha
nnel
Ban
dwit
h
DUS 31
24
8
240 MHz(1)
6
20
MHz
DUS 41
24
8
480 MHz(1)
12
20
MHz
BB5212
48
8
960 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.
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Uplink Coordinated Multi-Point Reception
2.2.2
Sector Carrier Configuration
This feature supports the following sector carrier combination scenarios:
•
1 RX sector carrier + 1 RX sector carrier
•
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
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Feature Operation
•
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.
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Uplink Coordinated Multi-Point Reception
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.
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Parameters
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.
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Uplink Coordinated Multi-Point Reception
4
Network Impact
The implementation of this feature has no impact on the network.
8
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Associated Features and Affected Functions
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.
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Uplink Coordinated Multi-Point Reception
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
10
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
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Performance
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.
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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.
12
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Deactivate 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.
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