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LTE2091: FDD Supercell Extension
DN245601067
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Approved on 2015-05-08
Single RAN Features
Rel. 25R1-SR
Operating Documentation, Issue 02
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LTE2091: FDD Supercell Extension
Table of Contents
1 LTE2091: FDD SuperCell extension ........................................................................................... 5
1.1 Description of LTE2091: FDD Supercell Extension ...................................................... 5
1.2 LTE2091 reference data .................................................................................................. 8
1.3 Activating and configuring LTE2091 ............................................................................ 11
1.4 Deactivating LTE2091 .................................................................................................... 13
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LTE2091: FDD Supercell Extension
List of Tables
Table 1
Table 2
Table 3
4
Existing alarms related to LTE2091 ............................................................................. 9
Parameters modified by LTE2091 ............................................................................. 10
Existing parameters related to LTE2091 ................................................................. 10
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LTE2091: FDD Supercell Extension
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LTE2091: FDD Supercell Extension
1. LTE2091: FDD SuperCell extension
1.1 Description of LTE2091: FDD Supercell Extension
Introduction to the feature
The LTE2091: FDD Supercell Extension feature adds the support for 5, 15 and 20 MHz
supercells.
Benefits
End-user benefits
This feature can increase the throughput at cell edge in dense network deployments because of
reduced interference in comparison to “normal” cells.
Operator benefits
This feature helps to reduce the inter-cell interference in dense network deployments with slowly
moving UEs.
Requirements
For more information, see Reference data section.
Functional description
Functional overview
The Flexi Multiradio BTS supports the following extensions for the LTE1542: FDD Supercell
feature:
A single supercell in one basic cell set:
A basic cell set built with three distributed radio units supports the combination of two normal
15/20-MHz cells into a 15/20-MHz supercell. In addition, one normal 15/20-MHz cell can be
supported in the same basic cell set.
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One 20-MHz supercell plus one 10-MHz supercell:
In a basic cell set built with four distributed radio units providing two 5/10-MHz cells on band A
and two 15/20-MHz cells on band B, both cells of each band can be combined into one
supercell on each band. Chaining can be used between radio units of different bands if the first
RRH in chain supports 6 Gbps.
Special supercell configuration:
In a legacy dual band configuration in an extended cell set, three 10-MHz cells on band A and
three 20-MHz cells on band B, two cells of each band can be combined into one supercell on
each band. If the first RRH in chain supports 6 Gbps, chaining is used between radio units of
different bands. If RRHs only support 3-Gbps links, then chaining is used between one pair of
the 10-MHz radio units in the same band.
One supercell plus one normal 20-MHz cell
Triple band configurations with chaining - band A: one supercell plus one normal 20-MHz cell;
band B/C: each with one supercell plus one normal 10-MHz cell
Dual band configurations without chaining - band A: one supercell plus one normal 20-MHz cell;
band B: one supercell plus one normal 10-MHz cell
Dual band configurations with chaining - band A: one supercell plus one normal 20-MHz; band
B: one supercell plus one normal 10-MHz cell
The basic cell sets of this feature (first two bullets) can be combined with each other or replicated
up to a number of three instances. Alternatively, they can be combined with one instance of the
LTE2091: FDD Supercell Extension extended cell set (third bullet) or with up to two basic cell
sets from existing features.
Since LTE15A release, both two- and three-band downlink carrier aggregation is supported with
supercells.
Note:
The 10-MHz supercell configurations as defined in the LTE1542: FDD Supercell feature
are implemented in one basic cell set. They can be freely combined with each other or
other cell sets from existing features, or they can be combined with one basic cell set
defined under this feature (first two bullets).
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LTE2091: FDD Supercell Extension
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LTE2091: FDD Supercell Extension
Note:
Only (sub-)cells of the same bandwidth can be combined into supercells. This means there
cannot be a supercell consisting of, for example, a 20-MHz subcell plus a 15-MHz subcell.
The usage of the same type of radio units in all sub-cells of one supercell is strongly
recommended. Creating supercells across different types of radio units is not blocked but
might cause significant performance degradation.
System impact
Interdependencies between features
The following features have to be activated and configured before activation of the LTE2091:
FDD Supercell Extension feature:
LTE72: 4-way RX diversity
LTE70: Downlink Adaptive open Loop MIMO for Two Antennas or LTE703: Downlink
Adaptive Closed Loop MIMO for Two Antennas
The following features are not supported simultaneously with the LTE2091: FDD Supercell
Extension feature:
LTE48: Support of high speed users
LTE495: OTDOA
LTE1195: Repeater Interface Unit
RF Sharing features (for exampe: LTE447: SW support for RF sharing GSM-LTE, LTE435: RF
sharing WCDMA-LTE)
any higher order MIMO functionality (for example: LTE568: DL adaptive closed loop MIMO
(4x2), LTE1402: Uplink Intra-eNB CoMP, or LTE1691: Uplink intra-eNB CoMP 4Rx)
in order to use chained radios, LTE977: RF Chaining must be activated
The following features can be used with workarounds as multiple transmission points are used:
LTE468: PCI Management
LTE783 ANR InterRAT UTRAN
LTE784 ANR InterRAT GSM
Impact on interfaces
The connection between RRH and RF module has to be done via OBSAI RP03. Chaining is
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supported for some configurations, details can be found in Creating LTE Configurations.
Impact on network management tools
SON features are supported equally for supercells and “normal” cells. The supercell is a
decentralized site configuration.
If the supercell is not a distributed site configuration, then SON functions can be based on site
geo-location data as fallback.
Impact on system performance and capacity
The capacity of the 20 MHz supercell, combined from two normal cells, corresponds to a regular
20 MHz cell in a three cells eNB configuration. The number of users per cell and supercell is the
same (840).
The performance of the 20 MHz supercell, combined from two normal cells, corresponds to a
normal 20 MHz cell in a three cells eNB configuration.
Management data
For more information, see Reference data section.
Sales information
For more information, see Reference data section.
1.2 LTE2091 reference data
LTE2091: FDD SuperCell extension requirements, alarms and faults, commands, measurements
and counters, KPIs, parameters, and sales information
For reference data descriptions, see Reference Documentation/Reference document.
Requirements
For supported hardware and software, see Operating Documentation/Single RAN Features/List
of Features and Documents.
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LTE2091: FDD Supercell Extension
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LTE2091: FDD Supercell Extension
Alarms
Table 1: Existing alarms related to LTE2091
Alarm ID
Alarm name
7654
CELL OPERATION DEGRADED
7653
CELL FAULTY
7655
CELL NOTIFICATION, fault TX failure in MIMO
BTS faults and reported alarms
There are no BTS faults related to the LTE2091: FDD SuperCell extension feature
Commands
There are no commands related to the LTE2091: FDD SuperCell extension feature.
Measurements and counters
There are no measurements or counters related to the LTE2091: FDD SuperCell extension
feature.
Key performance indicators
There are no key performance indicators related to the LTE2091: FDD SuperCell extension
feature.
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LTE2091: FDD Supercell Extension
Parameters
Table 2: Parameters modified by LTE2091
Full name
Abbreviated name
Managed object
Downlink channel
bandwidth
dlChBw
LNCEL
Uplink channel
bandwidth
ulChBw
LNCEL
Activate supercell
configuration
actSuperCell
LNCEL
Table 3: Existing parameters related to LTE2091
Full name
Abbreviated name
Managed object
PRACH high speed flag
prachHsFlag
LNCEL
Downlink MIMO mode
dlMimoMode
LNCEL
PRS activation
actOtdoa
LNCEL
Activation of downlink
carrier aggregation
actDLCAggr
LNBTS
Sub cell identifier
subCellId
LCELL
Uplink CoMP Cell List
ulCoMpCellList
ULCOMP
RIP tracing
ripTracing
MTRACE
Max number of secondary
cells for DL carrier
aggregation
maxNumScells
LNCEL
Activate RIP alarming
actRIPAlarming
LNCEL
Sales information
For licensing information, see Operating Documentation/Single RAN System/Licenses.
Remember that for 5G features, you also need to configure the Use Case Level Activation
Parameters (UCLAPs). For more information, see Operating Documentation/Single RAN
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LTE2091: FDD Supercell Extension
System/Licenses/5G and SRAN License Operation.
1.3 Activating and configuring LTE2091
Instructions to activate the feature
Before you start
Restart of the eNB is required after activation of this feature.
The following features have to be activated and configured before activation of the LTE2091:
FDD Supercell Extension feature:
LTE72: 4-way RX diversity
LTE70: Downlink Adaptive open Loop MIMO for Two Antennas or LTE703: Downlink
Adaptive Closed Loop MIMO for Two Antennas
The following features are not supported simultaneously with the LTE2091: FDD Supercell
Extension feature:
LTE48: Support of high speed users
LTE495: OTDOA
LTE1195: Repeater Interface Unit
RF Sharing features (for exampe: LTE447: SW support for RF sharing GSM-LTE, LTE435: RF
sharing WCDMA-LTE)
any higher order MIMO functionality (for example: LTE568: DL adaptive closed loop MIMO
(4x2), LTE1402: Uplink Intra-eNB CoMP, or LTE1691: Uplink intra-eNB CoMP 4Rx)
in order to use chained radios, LTE977: RF Chaining must be activated
Additionally:
The Enhanced cell vendor specific tracing
(enhCellVendorSpecTracing)/RIP tracing (ripTracing) MTRACE parameter value
must be set to false in all MTRACE instances belonging to the LNCEL object.
The RIP alarming configuration (ripAlarmingConfig)/Activate RIP
alarming (actRIPAlarming) parameter value must be set to false in LNCEL_FDD
object.
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Procedure
1
Go to the HW Selection page.
1.1
Make sure the two RMODs are connected to one SMOD.
The Supercell requires two radio modules.
2
Go to the Cell Resources page.
2.1
To activate Supercell select a local cell from the list of available cells or create a
new cell by clicking New Cell.
Modification of sub cell IDs causes BTS restart.
2.2
In the Activate specific cell configuration section select Super
cell.
2.3
Assign Sub cell IDs and set antennas to TXRX for both RMODs according to the
one of the supported configurations.
For more information on the supported hardware configurations for LTE2091: FDD
Supercell Extension , see Creating LTE Configurations.
2.4
Set the Downlink MIMO mode (dlMimoMode) parameter in MIMO mode to one
of the following values:
TXDiv
Dynamic Open Loop MIMO
Closed Loop MIMO
Note:
Modification of the Downlink MIMO mode (dlMimoMode) parameter
causes BTS restart.
3
Go to LTE Carriers page and configure the cell bandwidth.
3.1
In the table Downlink (TX) carriers set the Downlink channel
bandwidth (dlChBw) parameter to desired value. Set also the relevant EARFCN
value (the Uplink channel bandwidth (ulChBw) parameter will be filled in
automatically).
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LTE2091: FDD Supercell Extension
4
Go to Antenna Line Settings page and configure each antenna line settings.
5
Go to Radio Network Configuration page.
6
Go to the LNBTS_FDD object.
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LTE2091: FDD Supercell Extension
Object path: MRBTS›LNBTS›LNBTS_FDD
7
Set the Activate flexible base band usage (actFlexBbUsage) LNBTS_FDD
parameter to true.
8
Send parameters to the eNB.
Result
The LTE2091: FDD Supercell Extension feature combines “normal” overlapping cells into super
cell(s).
1.4 Deactivating LTE2091
Instructions to deactivate the feature
Before you start
Deactivation of this feature requires the eNB restart.
Procedure
1
Go to the Cell resources page.
1.1
In the Activate specific cell configuration section deselect Super
cell.
1.2
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Configure “normal” cells according to the selected transmission mode.
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Result
The LTE2091: FDD Supercell Extension feature does not combine “normal” overlapping cells
into super cell(s).
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LTE2091: FDD Supercell Extension