What is RRC connection setup in LTE?
The RRC CONNECTION SETUP message is used to establish SRB1. It contains configuration information for SRB1. This allows subsequent signaling to use the DCCH logical channel. The configuration for SRB1 can be a specific configuration or the default configuration.
What is RRC drop in LTE?
In simple words, a call drop in LTE means that a user’s ongoing session is dropped requiring the user to initiate a new connection to resume services. At the eNB level, this can be seen as an abnormal release which is verified from the cause code inside the Context Release message.
How can I improve my RRC setup success rate?
T302 should be increased to limit the RRC signalling load. When a UE gets a RRC Reject from eNB, it has to wait for T302 seconds before sending another RRC Connection Request. So, increasing T302 will increase the interval between such RRC Connection Requests and therefore, reduce the signalling load on the eNB.
Why is RRC connection needed?
RRC Connection Establishment procedure lets user inform network what it wants to do- attach, tracking area update, service request etc. It is used to make transition from RRC IDLE mode to RRC CONNECTED mode.
What is DRB in LTE?
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.
What is the function of RRC in LTE?
The RRC layer performs the following functions such as broadcast of system information, paging, establishment/release of an RRC connection, transfer of NAS information, AS security configuration, transfer of UE radio access capability, measurement configuration and reporting and mobility control.
What is the reason of handover failure in LTE?
There are many reasons for RLF in wireless networks. According to [9], there are two cases of RLF during handover: failures due to too late handover (LHO) and failures due to too early handover (EHO).
What is the difference between SRB and DRB in LTE?
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.
What is DRB?
A Dispute Resolution Board (DRB) is a form of alternative dispute resolution typically used on larger construction projects such as highway and transportation projects. A DRB is proactively appointed on a project before any disputes arise.
What is RRC Connection establishment for LTE?
The network triggers the RRC connection establishment procedure by sending a Paging message. This could be used to allow the delivery of an incoming SMS or notification of an incoming voice call RRC connection establishment for LTE is relatively simple compared to RRC connection establishment for UMTS.
Why is the RRC connection setup complete message not working?
It can also happen if the UE fails to decode RRC Connection Setup message so it will never send the RRC Connection Setup Complete message. This is the second issue that can happen but it is usually much less observed in commercial networks compared to the failures due to no response.
How to keep the RRC Connection while security is activated?
UE in RRC Connected state can initiate RRC Connection Re-Establishment procedure in order to keep the RRC connection while security is activated. Once this procedure is initiated, the UE will perform below steps: 2. Start T311 This message is used to request the reestablishment of an RRC connection.
How to trigger RRC connection from UE?
Or UE can trigger if it moves to a new Tracking Area and has to complete Tracking Area Update signaling procedure. Network can trigger by sending a Paging message. After a paging message has been sent by eNB, then RRC Connection setup request will be sent by the UE.