What is e-Rab in LTE?

What is e-Rab in LTE?

An E-RAB (E-UTRAN Radio Access Bearer) refers to the concatenation of an S1 bearer and the corresponding radio bearer. When an E-RAB exists, there is a one-to-one mapping between this E-RAB and an EPS bearer of the Non Access Stratum.

What is Erab setup in LTE?

E-UTRAN Radio Access Bearer (ERAB) is an important parameter in LTE Key Performance Indicator analysis. That’s why optimization engineers insist on making improvements on it. This parameter is formed by combining the S1 bearer and the corresponding radio bearer.

What is Erab failure in LTE?

Consequently, eNB sends Initial Context Setup Failure to the MME resulting in ERAB setup failure. This happens if the security configuration on the eNB is not supported by the UE or sometimes it can happen if the UE cannot handle both the Security Mode Command and the RRC Connection Reconfiguration together.

What is Erab modification?

The purpose of the E-RAB Modification Indication procedure is to enable the eNB to request modifications of already established E-RABs for a given UE. The procedure uses UE-associated signalling.

What is srb3?

Simple answer: The establishment of a signaling radio bearer (SRB) 3 in EN-DC mode means that RRC Measurement Reports for NR quality can be sent directly to the SgNB. This enables the 5G node to make intra-SgNB handover decisions and start the handover execution without involving the master eNodeB of the connection.

Which network entity initiates the RAB establishment procedure?

Establishment and modification of the E-RAB dedicated bearer are initiated by the MME entity by sending the E-RAB SETUP/MODIFY REQUEST messages.

What is Erab ID?

The E-RAB-ID IE uniquely identifies a radio access bearer for a particular UE, which makes the E-RAB ID unique over one S1 connection. The E-RAB ID shall remain the same for the duration of the E-RAB even if the UE-associated logical S1-connection is released or moved using S1 handover.

What is RRC setup success rate?

This means that if the network has a higher ratio of RRC Mo-Signalling requests then it will have a lower RRC Success Rate. Usually, Mo-Signalling is around 20 to 25% while Mo-data has the highest percentage. Still it can vary from network to network based on TAC planning and mobility strategy.

What is srb3 in 5G?

How do I improve my VoLTE call drop?

Consider activating features that will improve VoLTE retainability: TTI- Bundling, RRC connection re-establishment. Check parameter inconsistences associated with DRX settings, ROHC parametrisation, inactivity timers, etc. Check specific mobility parameterisation for QCI=1.

What is ESM information request?

The ESM information request procedure is used by the network to retrieve protocol configuration options like APN etc. from the UE during the attach procedure. This procedure is used as the UE has indicated (in the PDN CONNECTIVITY REQUEST) that it has ESM information that needs to be sent with security.

What is SRB and DRB in 5G?

There are two types of bearers SRB and DRB (Data radio bearer). SRB (Signaling Radio Bearer) is a type of radio bearer that carries signaling message i.e. RRC or NAS messages or both. DRB is used to carry the data associated with EPS bearer.

What is radio bearer setup?

Establishment of the radio bearers is achieved using an RB Setup procedure. The RB Setup procedure configures how both the DCCH and DTCH will be carried on the radio bearers. The RB Setup may specify a different DCCH RLC block size from the DCCH RLC block size that was being used when only an SRB was present.

What is DRB in NR?

Data Radio Bearer. In LTE there are two main types of bearers, namely the SRB (Signalling Radio Bearer) and the DRB (Data Radio Bearer). The DRB is used to carry the data associated with an EPS bearer. If you enjoy using our glossary, here are some other useful resources you might like…