CAPÍTULO II.- MARCO TEÓRICO 2.1 Marco Jurídico Normativo
2.4 Proceso del Entrenamiento
2.4.1 Detección de Necesidades de Entrenamiento
The LTE2557: Supplemental DL Carrier Extension feature enhances LTE2149:
Supplemental Downlink Carrier. A supplemental DL carrier (SDLC) is a cell only with downlink channel and not with the physical hybrid-ARQ indicator channel (PHICH). An SDLC can be used only as a secondary cell (SCell) in combination with downlink carrier aggregation for LTE.
3.16.1 LTE2557 benefits
The LTE2557: Supplemental DL Carrier Extension feature improves network coverage, capacity, and peak rates for the end user. This feature enables configuring cells as DL only which is beneficial in situations where interference on UL is too high, or UL spectrum is reserved (for example for military usage), but operators would like to make use of the DL spectrum.
3.16.2 LTE2557 functional description
The LTE2557: Supplemental DL Carrier Extension feature enhances the LTE2149:
Supplemental Downlink Carrier feature. This feature allows configuring the DL-only cell as a supplemental DL carrier (SDLC) and as an enhancement this feature allows to configure SDLC:
• on any FDD band used by an eNB
• for cells with any allowed bandwidth (5, 10, 15, and 20 MHz)
• for 1 TX, 2 TX, as well as 4 TX cell configurations
• for intra-eNB and inter-eNB carrier aggregation (CA) configurations There are two possible scenarios for feature deployment:
• All neighbor cells on a given frequency are DL-only cells; the whole frequency can be set as an SDLC frequency.
• Only part of neighbor cells are DL-only; such DL-only cells should be blacklisted to avoid unnecessary mobility, or the LTE1944: Dynamic Handover Blacklisting feature should be used.
It is possible to configure any cell as a DL-only cell by setting the TX and RX
usage (txRxUsage) LCELL parameter to a Tx value. This parameter change triggers BTS Site Manager (BTS SM) to automatically set the Activate supplemental downlink carrier (actSdlc) LNCEL activation flag to true.
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Note: Any reconfiguration from a DL and UL cell to DL-only, and vice versa, may lead to a BTS restart. It depends on what kind of parameters were modified. If the eNB decides that a BTS restart is needed, all UEs will be lost, affecting also the shutdown of all other cells served by this eNB.A barred cell from the perspective of LTE2557: Supplemental DL Carrier Extension In the LTE2557: Supplemental DL Carrier Extension feature, after configuring a cell as a supplemental DL carrier (SDLC), its status is broadcasted over an air interface, in a system information block 1 (SIB1), as a barred cell so that it cannot act as a primary cell (PCell) and is not used for mobility purposes. This is unrelated to the configuration of O&M parameter for a cell barred status (the cellBarred LNCEL parameter has a notBarred value). Since a cell is not barred from the O&M's perspective, adding SDLC as an SCell for downlink carrier aggregation is also possible.
Mobility towards supplemental DL carrier (SDLC)
Mobility towards SDLC is not possible. When a cell is declared as an SDLC cell, to avoid unnecessary signaling and measurements for handover to DL-only cells or SDLC cells, there is a need to blacklist such a cell for a handover or use the LTE1944: Dynamic Handover Blacklisting feature (this allows temporarily blacklisting the neighbor relation).
On such a cell, any incoming Handover Request will be rejected by the eNB with cause Radio Network Layer (Cell not Available) value in Handover Preparation Failure message. Outgoing handovers targeting SDLC cells can be forbidden by configuring the Supplemental DL carrier frequency list (sdlcFreqList) LNBTS parameter list. This parameter list contains the frequencies (DL E-UTRA
absolute radio frequency channel numbers) of cells that are operated in downlink only and are used as SCells in carrier aggregation. This list can be used to forbid outgoing mobility procedures.
Load-balancing relation with supplemental DL carrier (SDLC)
DL-only cells are excluded from all types of load balancing, apart from the one available for an SCell of the LTE2006: Flexible SCell Selection feature. For an SCell selection, the LTE2006 feature uses the normalized load compare value (NLCV) mechanism which selects a less loaded SCell when radio admission control has the choice between two or more SCells on different frequency layers.
3.16.2.1 A barred cell from the perspective of LTE2557: Supplemental DL Carrier Extension
In the LTE2557: Supplemental DL Carrier Extension feature, after configuring a cell as a supplemental DL carrier (SDLC), its status is broadcasted over an air interface, in a system information block 1 (SIB1), as a barred cell so that it cannot act as a primary cell (PCell) and is not used for mobility purposes. This is unrelated to the configuration of O&M parameter for a cell barred status (the cellBarred LNCEL parameter has a notBarred value). Since a cell is not barred from the O&M's perspective, adding SDLC as an SCell for downlink carrier aggregation is also possible.
3.16.2.2 Mobility towards supplemental DL carrier (SDLC)
Mobility towards SDLC is not possible. When a cell is declared as an SDLC cell, to avoid unnecessary signaling and measurements for handover to DL-only cells or SDLC cells, there is a need to blacklist such a cell for a handover or use the LTE1944: Dynamic Handover Blacklisting feature (this allows temporarily blacklisting the neighbor relation).
On such a cell, any incoming handover request will be rejected. When the whole frequency is configured as an SDLC frequency, the BTS will not start any mobility towards target cells on the SDLC frequency.
3.16.2.3 Load-balancing relation with supplemental DL carrier (SDLC)
DL-only cells are excluded from all types of load balancing, apart from the one available for an SCell of the LTE2006: Flexible SCell Selection feature. For an SCell selection, the LTE2006 feature uses the normalized load compare value (NLCV) mechanism to select a less loaded SCell when radio admission control (RAC) has the choice between two or more SCells on different frequency layers.
3.16.2.4 Idle-mode mobility relation with supplemental DL carrier (SDLC)
An SDLC cell is always broadcasted as a barred cell (via SIB); therefore, even if the SDLC frequency is used in reselection, SDLC cells should be excluded from idle-mode mobility. In addition, idle-mode-related managed object classes (MOCs) cannot point to the frequency which is configured as an SDLC frequency.
3.16.3 LTE2557 system impact
Interdependencies between features
The following features must be activated before activating the LTE2557: Supplemental DL Carrier Extension feature:
• any of the downlink carrier aggregation features are a prerequisite
• LTE2149: Supplemental DL Carrier
This feature is a baseline for the LTE2557 feature.
The LTE2557: Supplemental DL Carrier Extension feature is impacted by the following features:
• The following features can be used together with LTE2557 to increase flexibility of Carrier Aggregation configurations:
– LTE2006: Flexible SCell Selection
An SDLC cells play a role of candidates for SCell swap.
– LTE2233: N-out-of-M Downlink Carrier Aggregation
An SDLC cells play a role of candidates for SCell swap based on A6 measurement reports or average cell load.
– LTE2007: Inter-eNodeB Carrier Aggregation
An SDLC cells can be configured in inter-eNB CA deployments (including cases where one of the eNBs hosts SDLC cells only).
• LTE1944: Dynamic Handover Blacklisting
This feature allows temporarily blacklisting the neighbor relation. It is recommended to use LTE1944 together with LTE2557 to avoid unnecessary signaling and
measurements for a handover to DL-only cells (SDLC cells).
Impact on interfaces
The LTE2557: Supplemental DL Carrier Extension feature has no impact on interfaces.
Impact on network management tools
The LTE2557: Supplemental DL Carrier Extension feature has no impact on network management tools.
Impact on system performance and capacity
The LTE2557: Supplemental DL Carrier Extension feature can improve peak and download throughput for non-GBR UEs with the secondary cell (SCell) configured.
Additionally, a system capacity gain is expected. It can be doubled for bandwidth combinations with an equal bandwidth of two involved cells.
3.16.4 LTE2557 reference data
Requirements
Table 65 LTE2557 hardware and software requirements System release Flexi Multiradio
BTS
Flexi Multiradio 10 BTS
Flexi Zone Micro BTS
Flexi Zone Access Point
FDD-LTE 16A not supported FL16A FL16A FL16A
Flexi Zone Controller
OMS UE NetAct MME SAE GW
FL16A LTE OMS16A 3GPP R10 UE capabilities is the minimum
NetAct 16.8 support not required
support not required
BTS faults and reported alarms
There are no faults related to the LTE2557: Supplemental DL Carrier Extension feature.
Commands
There are no commands related to the LTE2557: Supplemental DL Carrier Extension feature.
Measurements and counters
There are no measurements or counters related to the LTE2557: Supplemental DL Carrier Extension feature.
Key performance indicators
There are no key performance indicators related to the LTE2557: Supplemental DL Carrier Extension feature.
Parameters
Table 66 Parameters modified by LTE2557
Full name Abbreviated name Managed object
Parent structure
TX and RX usage txRxUsage LCELL resourceList Activate supplemental
downlink carrier
actSdlc LNCEL
-For parameter descriptions, see FDD-LTE BTS Parameters.
Sales information
Table 67 LTE2557 sales information
Product structure class License control Activated by default Application software (ASW) Pool license No