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SRB stands for Signaling Radio Bearer.? Signalling Radio Bearers? (SRBs) are defined because Radio Bearers (RBs) used only for the transmission regarding RRC and EM messages. As defined per 3GPP specs TS38. 331, presently there are four several 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 effectively as for EM messages prior to be able to the establishment of SRB2, all applying DCCH logical route;
SRB2 is with regard to NAS messages, almost all using DCCH rational channel. SRB2 provides a lower-priority than SRB1
SRB3 will be for specific RRC messages when UE is in EN-DC, all using DCCH logical channel.
Throughout comparison to 4-G, NR has another SRB called SRB3.
In case involving EN-DC, SRB3 might be configured for your transfer of several NR RRC messages between UE and even SgNB via typically the NR radio interface.
Advantages of SRB 3:
SRB3 is recommended and provides a direct SRB between your Secondary RAN Node in addition to the device, When SRB3 is not configured by network then LTE RRC (vai X2 interface) can pass the particular NR RRC communications between UE and en-gNB and this? s utilizing SRB1.
The advantages of introducing new SRB3:
Direct RRC connection between UE plus SgNB
Enable the particular 5G node to be able to make intra-SgNB handover decisions.
Reduced latency of the RRC signalling between UE and SgNB
Primary Measurement Reports sent to SgNB which leads to faster plus direct reports with regard to HO purposes.
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