Where is SSB located in the time domain?
SSB Burst is contained inside a 5ms time frame and up to a max of 64 SSB beams are transmitted within the 5ms time period. A radio frame is of 10ms and the SSB burst can happen in the first…
5G-NR
RACH Decision-Making: How gNB Chooses CFRA or CBRA
In the 5G-NR RACH process, the gNB’s ability to configure Contention Free RACH to UE hinges on transmitting specific dedicated information. This includes the SSB index, PRACH Preamble, and RACH Occasion. For CFRA RACH to be initiated, the network must…
5G-NR Master Information Block (MIB)
MIB is mandatory system information that is broadcasted by the gNB at a set periodicity. During the initial cell selection procedure, UE assumes that the SSB is broadcasted every 20ms by the gNB. UE gets MIB by decoding the PBCH…
Guide to reading 3GPP Specifications
Reading specs from 3GPP can be sometimes very difficult as there are so many specs and navigating through each of them can be a daunting task and there is no definitive and clear guide on how to use the specs…
Protection of 5G RRC messages
There are certain messages that 3GPP has defined that can be sent prior to Access stratum security activation and some messages which should not be sent without integrity protection or unciphered after AS security activation Below are the list of…
5G PS Icon Indicator on Mobile Phones
If you are working in Wireless communications for modem/device or RAN industry Have you ever wondered when the 5G ICON is displayed on the mobile? A UE will display 5G PS ICON when it is in the SA Coverage area…
Conditional Handover (CHO) in 5G NR Release16
In Release-16, 3GPP Introduced a new Handover procedure that allows UE to decide to perform handover when certain conditions are met, In the Legacy handover procedure network was in charge of making the decision whether the handover should be performed…
2-Step RACH: msgB Contents information
In 2-Step RACH the msg2 i.e msgB Consists of a Random Access response and Contention resolution identity. It is a combination of msg2+msg4 from a 4-step RACH perspective. The details of msgA transmission and msgB reception are discussed in another…
2-Step RACH : MsgB Reception-Part2
msgB is a combination of Msg2 and Msg4. In response to a transmission of a PRACH and a PUSCH i.e msgA transmission, UE expects a Response from gNB containing MsgB information. The details related to msgB reception are discussed in this article.
2-Step RACH in Release-16 of 5G-NR
In Earlier versions of NR Releases prior to R-16, There was only one type of RACH procedure which is kind of similar to the LTE RACH procedure also known as the 4-Step RACH procedure. In the Release-16 NR version, 3GPP…