fbpx
Thursday, March 28, 2024
No menu items!
Home5G knowledge4 different types of SRB in 5G New Radio (NR)

4 different types of SRB in 5G New Radio (NR)

  • SRB stands for Signaling Radio Bearer.”Signalling Radio Bearers” (SRBs) are defined as Radio Bearers (RBs) that are used only for the transmission of RRC and NAS messages.As defined per 3GPP specification TS38.331,  there are four different types of SRB in 5G New Radio (NR) defined as follows.
    • SRB 0 is for RRC messages using the CCCH logical channel;
    • SRB1 is for RRC messages as well as for NAS messages prior to the establishment of SRB2, all using DCCH logical channel;
    • SRB2 is for NAS messages, all using DCCH logical channel. SRB2 has a lower-priority than SRB1
    • SRB3 is for specific RRC messages when UE is in EN-DC, all using DCCH logical channel.
  • In comparison to 4G, NR has one more SRB called SRB3.
    • In case of EN-DC, SRB3 may be configured for the transfer of some NR RRC messages between UE and SgNB via the NR radio interface.
  • Advantages of SRB 3:
  • SRB3 is optional and provides a direct SRB between the Secondary RAN Node and the device, If SRB3 is not configured by network then LTE RRC (vai X2 interface) are able to pass the NR RRC messages between the UE and en-gNB and it’s utilizing SRB1.
  •  The advantages of introducing new SRB3:
    • Direct RRC communication between UE and SgNB
    • Enable the 5G node to make intra-SgNB handover decisions.
    • Reduced latency of the RRC signalling between UE and SgNB
    • Direct Measurement Reports sent to SgNB which leads to faster and direct reports for HO purposes.

 

Don’t miss our 5G KPI, 5G Optimization and Troubleshooting training for which we can provide you special offer, and you can check more details about the training below :

5G KPI, 5G Optimization and 5G Troubleshooting Training

 


Benefit from Massive discount on our 5G Training with 5WorldPro.com

The most complete and comprehensive 5G course, follow this link for more information

Start your 5G journey and obtain 5G certification

contact us:  [email protected]

Stay Aware of the last 5G news

Register to our newsletter to receive last 5G news and 5G training details

Follow Us On Linkedin

Most Popular

Receive the latest events

Do you want to participate to this event ?

Get notified about new events

× Which Training you are interested in ?