What is RRC connection reestablishment?

LTE: RRC Connection Reestablishment Request 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 is RRC connection in LTE?

The RRC protocol is the signaling exchanged between the mobile and the evolved Node Base station (eNB) over the LTE-Uu radio interface. The RRC protocol performs the following functions: Broadcast of system information related to the characteristics of the radio interface.

What is LTE RRE?

When LTE is introduced, the RRE is connected by optical cable to the BDE of the LTE base station equip- ment. Then, the W-CDMA system is connected through the BDE of the LTE system, which has a relay function for the W-CDMA CPRI signal.

When to request RRC connection re-establishment request?

RRC Connection re-establishment request This process starts when UE is in RRC_CONNECTED mode. The purpose of this procedure is to re-establish the RRC connection to continue RRC connection, which involves the resumptions of SRB1 operation and the re-activation of security.

When do I send RRC request to 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.

When does UE initiate RRC re-establishment procedure?

This procedure will be initiated by UE on below scenarios: 1. Upon re-entry into service area after radio link failure 2. Handover failure 3. When lower layers detect problems as specified in TS 36.322

What do you need to know about RRC connection?

RRC connection request is used to establish an RRC Connection. Information Elements in RRC Connection Request are: ue-Identity: It can be either S-TMSI (40-bits) from upper layer or a bit of randomValue (40-bits). If the UE is registered in TA of current cell, then upper layers can send S-TMSI number.