LTE GBR, N-GBR, MBR, A-AMBR and UE-AMBR
To ensure that bearer traffic in LTE networks is appropriately handled, a mechanism is needed to classify the different types of bearers into different classes, with each class having appropriate QoS parameters for the traffic type.
GBR (Guaranteed Bit Rate) – A minimum bit rate required for services like Voice over Internet Pro- tocol (VoIP), Conversational Video, Real time gaming etc. This is the minimum guaranteed bit rate per EPS bearer.QCI 1 to 4 is associated with resource type GBR.
N-GBR (Non Guaranteed Bit Rate) – Non-GBR bearer does not provide guaranteed bit rate.This is used for services which does not required a minimum guaranteed bit rate like voice/video streaming, email,chat etc. QCI 5 to 9 is associated with resource type GBR.
MBR (Maximum Bit Rate) – The maximum guaranteed bit rate per EPS bearer.
A-AMBR (APN Aggregate Maximum Bit Rate) – APN Aggregate maximum bit rate is the maximum allowed total non-GBR throughput to specific APN.
UE-AMBR (UE-Aggregate Maximum Bit Rate) – UE Aggregate maximum bit rate is the maximum allowed total non-GBR throughput among all APN to a specific UE. A UE can be connected to more than one PDN like PDN1 for chat and PDN2 for VOIP and it has one unique IP address for each of its all PDN connections. Here, UE-AMBR (UL/DL) indicates the maximum bandwidth allowed for all the non-GBR EPS bearers associated to the UE.