3.8.4 2445 reference data
3.9 LTE2460: Automatic Access Class Barring with PLMN DisablingPLMN Disabling
The LTE2460: Automatic Access Class Barring with PLMN Disabling feature reduces user equipment's (UE's) access to a cell. The reduction is done with an automatic removal of further public land mobile network (PLMN) IDs in a high control plane load situation. Additionally, it supports an automatic recovery of removed PLMN IDs when the cell is no longer overloaded. The removal and recovery of PLMN IDs is performed by an eNB.
3.9.1 LTE2460 benefits
The LTE2460: Automatic Access Class Barring with PLMN Disabling feature provides the following benefits:
• automatic limitation of signalling during a high control plane load
• monitoring the time that passed when the PLMN IDs are removed
• planning the potential improvements for the network's capacity
3.9.2 LTE2460 functional description
Removal of PLMN IDs
The LTE2460: Automatic Access Class Barring with PLMN Disabling feature enhances the LTE1047: Control Plane Overload Handling feature with a possibility to disable the broadcast of further public land mobile network (PLMN) IDs from the
SystemInformationBlockType 1 (SIB1). Consequently, if the PLMN ID is not broadcasted, the cell becomes invisible for the user equipment (UE).
The automatic removal of a PLMN ID takes place if both of the following conditions are fulfilled:
• A control plane overload level 2 defined in the LTE1047: Control Plane Overload Handling feature is active.
• An eNB runs the access class barring operation in an overloaded cell according to the LTE1788: Automatic Access Class Barring feature.
g
Note: Public safety user equipment (PS UE) is allowed to access the cell even if the LTE2460: Automatic Access Class Barring with PLMN Disabling feature is enabled.Recovery of PLMN IDs
The LTE2460: Automatic Access Class Barring with PLMN Disabling feature enables recovering the PLMN IDs broadcasted in the SIB1. The recovery is performed by the eNB, and it takes place in a situation when a cell is no longer overloaded.
Monitoring the removal and recovery of PLMN IDs
The LTE2460: Automatic Access Class Barring with PLMN Disabling feature enables monitoring the automatic removal of PLMN IDs. In order to make this function available, a new counter is introduced Time period of automatic Access Class Barring with PLMN disabling. The counter informs the operator about how long the subscribers were not able to select a removed further PLMN due to the automatic removal procedure.
It is recommended to monitor also the quality of service for the neighbor cells in order to track the call and handover drop rates. High rates, in addition to the long PLMN ID disabling period, inform the operator about a potential need to improve the network's capacity.
3.9.3 LTE2460 system impact
Interdependencies between features
The following features must be activated before activating the LTE2460: Automatic Access Class Barring with PLMN Disabling feature:
• LTE1047: Control Plane Overload Handling
The removal of public land mobile network (PLMN) IDs is possible only if the overload achieves a self-defense level (level 2) defined in the LTE1047: Control Plane Overload Handling feature.
• LTE1788: Automatic AC Barring
The LTE1788: Automatic AC Barring feature applies the automatic access class barring in case there is a prolonged overload situation in a control plane. If the overload persists, the LTE2460: Automatic Access Class Barring with PLMN Disabling feature runs the autonomous removal of further PLMN IDs broadcasted in the SystemInformationBlockType 1 (SIB1).
Impact on interfaces
The LTE2460: Automatic Access Class Barring with PLMN Disabling feature has no impact on interfaces.
Impact on network management tools
The LTE2460: Automatic Access Class Barring with PLMN Disabling feature has no impact on network management tools.
Impact on system performance and capacity
The LTE2460: Automatic Access Class Barring with PLMN Disabling feature has no impact on system performance or capacity.
3.9.4 LTE2460 reference data
Requirements
Table 39 LTE2460 hardware and software requirements Multiradio 10
BTS
Nokia AirScale BTS
Flexi Zone Micro BTS
Flexi Zone Access Point
FDD-LTE 16A Not supported FL16A Not supported FL16A FL16A
Flexi Zone Controller
OMS UE NetAct MME SAE GW
FL16A LTE OMS16A 3GPP R8-R12 NetAct 16.8 Flexi NS4.0 Support not required Alarms
There are no alarms related to the LTE2460: Automatic Access Class Barring with PLMN Disabling feature.
BTS faults and reported alarms
There are no faults related to the LTE2460: Automatic Access Class Barring with PLMN Disabling feature.
Commands
There are no commands related to the LTE2460: Automatic Access Class Barring with PLMN Disabling feature.
Measurements and counters
Table 40 New counters introduced by LTE2460 Counter
ID
Counter name Measurement
M8001C 285
Time period of automatic Access Class Barring with PLMN disabling
LTE Cell Load
For counter descriptions, see LTE Radio Access Operating Documentation/Reference/Counters.
Key performance indicators
Table 41 New key performance indicators introduced by LTE2460
KPI ID KPI name
LTE_6005a Time period of further PLMN removal LTE_6006a Time ratio of further PLMN removal
A full list of KPIs including a change information will be available in the next delivery.
Parameters
Table 42 New parameters introduced by LTE2460
Full name Abbreviated name Managed object
Parent structure
Activate automatic PLMN removal
actAutoPlmnRemova l
LNBTS
-Table 42 New parameters introduced by LTE2460 (Cont.) Full name Abbreviated name Managed
object
Parent structure
Automatic AC barring and PLMN removal stop timer
autoAcbPlmnRmvlSt opTimer
SIB
-Autonomous further PLMN removal start timer
autoPlmnRmvlStart Timer
SIB
-Autonomous PLMN removal allowed
autoRemovalAllowe d
LNCEL furtherPlmnIdL
Table 43 Existing parameters related to LTE2460
Full name Abbreviated name Managed object
Parent structure
Activation of C-plane overload handling
actCplaneOvlHandl ing
LNBTS
-Activation of Automatic AC Barring
actAutoAcBarring LNBTS
-For parameter descriptions, see LTE Radio Access Operating Documentation/Reference/Parameters.
Sales information
Table 44 LTE2460 sales information
Product structure class License control Activated by default Application software (ASW) Pool license No