Benefits, functionality, system impact, reference data, instructions of the feature The LTE2754: Frequency Bands Priority Change in mFBI feature supports multiple frequency band indicator (mFBI) frequency band prioritization.
3.26.1 LTE2754 benefits
The LTE2754: Frequency Bands Priority Change in mFBI feature prioritizes mFBI-mapped band. The feature targets the UE to select the mapped band with higher priority when both bands are supported. In case the mFBI user equipment (UE) supports a native primary cell (PCell) and mapped PCell band, the mapped band is used to support carrier aggregation (CA). Otherwise, CA is not supported with the band combination of the mapped PCell, and an extra intra-cell handover is needed to support CA for these UEs.
3.26.2 LTE2754 functional description
The LTE2754: Frequency Bands Priority Change in mFBI feature introduces support for frequency band priority change in the mFBI. The feature is an extension to the LTE1534:
Multiple Frequency Band Indicator feature for UEs that only support certain band-related features (for example, the UE supports CA if PCell works on the mapped band). For more information, see the LTE1534: Multiple Frequency Band Indicator feature description.
Currently, the band-applying rule for accessing a carrier that belongs to a different overlapping frequency band causes an additional intra-cell handover to UEs that support certain band-related features in one of the overlapping bands.
To avoid additional handovers, a new freqBandIndicatorPriority information element (IE) in the system information broadcast 1 (SIB1) is introduced to change the priorities of the overlapping bands and the corresponding UE capabilities. The freqBandIndicatorPriority IE indicates whether the UE supports the prioritization of the frequency band in the multiBandInfoList IE or the band in the freqBandIndicator IE.
The evolved Node B (eNB) considers the UE capabilities to support band priority change and the SIB1 content to determine if the UE uses native or mapped band during initial call setup. During handover, the target eNB considers the UE capabilities to support band priority change and the SIB1 content to select the E-UTRA absolute radio frequency channel number (EARFCN) for the target cell.
When the eNB and the UE support both bands and the UE support frequency band adjustment capability, the mapped EARFCN is selected as an operation EARFCN with higher priority instead of the native EARFCN, which the LTE1534: Multiple Frequency Band Indicator feature introduces in the dedicated signaling for the following procedure:
• PCell measurement objects
• Any type of intra-LTE handover
• SCell handling for CA
The native or mapped band is selected as the secondary cell (SCell) operation band.
This is depending on the supported CA band combinations. The LTE2754:
Frequency Bands Priority Change in mFBI feature affects the CA band combination selection based on the operation band of the PCell.
• eNB internal checks for UE-supported bands
The eNB internal checks for UE-supported bands are extended to consider supported mapped bands with higher priority.
3.26.3 LTE2754 system impact
LTE2754: Frequency Bands Priority Change in mFBI impact on features and interfaces Interdependencies between features
The LTE1534: Multiple Frequency Band Indicator feature must be activated before activating the LTE2754: Frequency Bands Priority Change in mFBI feature (actMFBI parameter is set to true).
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Note: Activation of the LTE1534: Multiple Frequency Band Indicator feature must be in the eNB and its neighbor eNBs.The LTE2754: Frequency Bands Priority Change in mFBI feature affects the following features:
• LTE039: System Information Broadcast
The mFBI-specific freqBandIndicatorPriority IE extends the content of the SIB1.
• LTE53: Intra- and Inter-eNodeB Handover with X2 and LTE54: Intra-LTE Handover via S1
The mapped EARFCN is used to communicate between the UE and the eNB. If the UE supports the mapped band adjustment for the inter-frequency handover, the mapped EARFCN is selected with higher priority.
• LTE55: Inter-frequency Handover and LTE1060: TDD - FDD Handover
The selection of the inter-frequency handover targets is extended. If the UE supports the mapped band adjustment for the inter-frequency handover, the mapped EARFCN is selected with higher priority.
• LTE423: RRC Connection Release with Redirect, LTE487: Idle Mode Load Balancing, LTE1407: RSRQ-based Redirect, and LTE1677: Idle Mode Mobility Balancing Extensions
If the UE supports the mapped band adjustment and the redirection target is shown in the multiple frequency band indicator profile (MFBIPR), the native EARFCN is selected as a redirection target instead of the mapped band.
• LTE1089: Downlink Carrier Aggregation - 20 MHz and LTE1332: Downlink Carrier Aggregation - 40 MHz
If the PCell selects the mapped band as its operation band, the eNB checks if the UE supports the band combination for CA against the PCell with the mapped band.
• LTE2275: PCell Swap
The LTE2754: Frequency Bands Priority Change in mFBI feature can be enabled with this feature. When PCell swap is triggered, the target PCell finds the available CA band combination with the mapped band.
• LTE2838: CA Steering Intra-cell Handover
The LTE2838: CA Steering Intra-cell Handover feature targets the UE that selects the native band as the operation band when both bands are supported. If the UE only supports some features on the mapped band, intra-cell handover is triggered to direct the native EARFCN to the mapped EARFCN.
If the UE supports the mapped band adjustment with higher priority even if a specific feature cannot be performed on the mapped band, the eNB does not trigger an intra-cell handover using the steering PCell mapped EARFCN to the native EARFCN.
• LTE2612: ProSe Direct Communications for Public Safety
The LTE2612: ProSe Direct Communications for Public Safety feature covers the interaction with the LTE2754: Frequency Bands Priority Change in mFBI feature.
Impact on interfaces
The LTE2754: Frequency Bands Priority Change in mFBI feature affects the following interfaces:
• S1 interface
– freqBandPriorityAdjustment-r12 IE in UE-EUTRA-Capability IE
• X2 interface
– freqBandPriorityAdjustment-r12 IE in UE-EUTRA-Capability IE
– freqBandIndicatorPriority IE in X2 setup or X2 eNB configuration update procedure
• RRC interface
– freqBandPriorityAdjustment-r12 IE in UE-EUTRA-capability – new freqBandIndicatorPriority-r12 IE added to SIB1
Impact on network management tools
The LTE2754: Frequency Bands Priority Change in mFBI feature has no impact on network management tools.
Impact on system performance and capacity
The LTE2754: Frequency Bands Priority Change in mFBI feature has no impact on system performance or capacity.
3.26.4 LTE2754 reference data
LTE2754: Frequency Bands Priority Change in mFBI requirements, parameters, and sales information
Requirements
Table 111 LTE2754 hardware and software requirements Multiradio 10
BTS
Nokia AirScale BTS
Flexi Zone Micro BTS
Flexi Zone Access Point
FDD-LTE 16A Not supported FL16A FL16A FL16A FL16A
Flexi Zone Controller
OMS UE NetAct MME SAE GW
FL16A LTE OMS16A 3GPP R12 UE capabilities BTS faults and reported alarms
Table 112 New BTS faults introduced by LTE2754
Fault ID Fault name Reported alarm
Alarm ID Alarm name
6278 MFBI cell
configuration conflict
7652 BASE STATION
NOTIFICATION
Commands
There are no commands related to the LTE2754: Frequency Bands Priority Change in mFBI feature.
Measurements and counters
There are no measurements or counters related to the LTE2754: Frequency Bands Priority Change in mFBI feature.
Key performance indicators
There are no key performance indicators related to the LTE2754: Frequency Bands Priority Change in mFBI feature.
Parameters
Table 113 New parameters introduced by LTE2754
Full name Abbreviated name Managed object
Parent structure
Frequency band indication priority
freqBandIndPrio MFBIPR
-Sales information
Table 114 LTE2754 sales information
Product structure class License control Activated by default Application software (ASW) Pool license No