What is T304 timer in LTE?

What is T304 timer in LTE?

T304. Reception of RRCConnectionReconfiguration message including the MobilityControl Info or reception of MobilityFromEUTRACommand message including CellChangeOrder. Criterion for successful completion of handover to EUTRA or cell change order is met (the criterion is specified in the target RAT in case of inter-RAT)

What is T311 LTE?

T311 is a supervision timer for the cell selection procedure after a OoS scenario. If before T311 expires the UE finds a suitable cell, it stops T311, starts T301, send RRCConnectionReestablishmentRequest and wait for the eNodeB response. The T301 is a supervision timer for the RRCConnectionReestablishment procedure.

What is T300 in 5g?

The Timer T300 starts at the transmission of RRC Connection Request. It stops at receptionof RRC Connection Setup or RRC Connection Reject message, cell selection.

What is RRC connection reestablishment?

The object of the RRC connection reestablishment procedure is to reestablish the RRC connection, which includes restoring Signaling Radio Bearer 1 (SRB1) and reactivating the security. Scenarios in which a UE needs an RRC connection reestablishment request are defined in the 3GPP RRC protocol.

What is radio link failure in LTE?

RLF is defined as Physical layer break. → Below reasons for RLF from UE side: The measured RSRP is too low (under a certain limit) It failed to decode PDCCH due to power signal quality (e.g, low RSRP, RSRQ) It failed to decode PDSCH due to power signal quality (e.g, low RSRP, RSRQ).

What is Rach LTE?

Random Access Procedure:- In order to be synchronized with the network, RACH procedure is used. Suppose a UE wants to access the network, so first it will try to attach or syncronise with the network. In LTE a separate channel PRACH ( Physical Random Access Channel) is provided for initial access to the network.

What is ENDC in 5G?

In short, ENDC is an NSA 5G architecture that allows smartphones to access both 5G and 4G LTE networks at the same time. A key benefit of ENDC is that it combines the bandwidth of 5G and 4G LTE, effectively allowing carriers to take advantage of the benefits of both network technologies simultaneously.

What is difference between Rrcconnectionreconfiguration and RRC re-establishment?

RRC CONNECTION RECONFIGURATION message is the command to modify an RRC connection. While the purpose of RRC CONNECTION RE-ESTABLISHMENT procedure is to re-establish the RRC connection, which involves the resumption of SRB1 operation and the re-activation of security (without changing algorithms).

What causes radio link failure?

Following are the possible causes of radio link failure in wireless system. Failure at lower layers of stack i.e. at RF or physical layer due to higher frequency offset or time offset, poor carrier to interference conditions on the channels exchanged between UE and NB (i.e. base station).

What is the reason of handover failure in LTE?

Handover failure can occur at any stage, but poor radio conditions and patchy coverage caused by fad- ing and pathloss are the main reasons. The majority of failures are expected to occur before HO command has been successfully delivered.

What is IMS in VoLTE?

The Ribbon VoLTE and IP Multimedia Subsystem (IMS) solution combines robust IMS service functionality with the ability to securely and intelligently route high volumes of Session Initiation Protocol (SIP) and Diameter traffic together with media processing and transcoding at both the core and the edge of the network.

What is Msg1 and Msg2?

Msg1 : Random Access Preamble (RA) Msg2 : Random Access Response (RAR)

How many types of RACH LTE are there?

The answer would be 14, because UE can send the RACH in any SFN and any slots within the frame.

Is ENDC same as NSA?

What is SGNB?

Secondary gNB. A device operating in 5G DC (Dual Connectivity), NGEN-DC (NG-RAN – E-UTRA NR Dual Connectivity) or EN-DC (E-UTRA – NR Dual Connectivity), identifies the Secondary RAN node as the “Secondary gNB”. In the case of EN-DC, it is also identified as the “en-gNB”.

What is SRB1 and SRB2?

SRB1 used to transfer RRC messages which use DCCH channel. • SRB2 used to transfer RRC messages which use DCCH channel and encapsulates a NAS message. SRB1 is also used to encapsulate NAS message if SRB2 has not been configured. SRB2 has lower priority then SRB1 and it is always configured after security activation.

What is SRB DRB?

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.