Msg3 and Msg4 are used for contention resolution. The uplink time synchronization are completed in Msg1 and Msg2. The purpose of Msg3 and Msg4 is to identify the C-RNTI for the subsequent data transmission. During CBRA, there are chances that multiple UE may use the same …
Once the RACH configuration and preambles are selected, it is to be sent out to the available PRACH occation. For that RA-RNTI is to be calculated according to the PRACH occation. In this chapter we shall see: 1. What is the power required to send Msg1 …
In previous 2 chapters, we had a a brief of RACH procedure. In the next chapters we shall have indepth understanding of all the messages. In brief: 1. CBRA procedure is as below: i) UE –> NW : RACH Preamble (RA-RNTI, indication for L2/L3 message size) …
In this chapter we shall see where the UE can get the resources for PRACH transmission. Before UE can send a PRACH, it needs to select an SSB then UE will selects an SSB with SS-RSRP above rsrp-ThresholdSSB for PRACH transmission. For normal RACH procedure, UE …
RACH: Random Access procedure is used for uplink synchronization and RRC Connection. UE will get downlink synchronization after successfully decoding SSB. Before Rel 16, there was only 1 type of RACH that is similar to LTE i.e 4-step RACH. But after Rel-16, 3GPP introduced new 2-step …
SIB4: SIB4 contains information relevant for inter-frequency cell re-selection (i.e. information about other NR frequencies and inter-frequency neighbouring cells relevant for cell re-selection), which can also be used for NR idle/inactive measurements. SIB4 ::= SEQUENCE { interFreqCarrierFreqList InterFreqCarrierFreqList, lateNonCriticalExtension OCTET STRING OPTIONAL, ... } InterFreqCarrierFreqList …
SIB3 is OSI It provides neighboring cell related information related to intra-frequency cell re-selection. Includes cells with specific re-selection parameters SIB3 cell specific information can be provided for up to 16 intra frequency cells SIB3 scheduling information is provided by SIB1 Transmission Details Signalling radio bearer: …
SIB2 contains cell re-selection information common for intra-frequency, inter-frequency and/or inter-RAT cell re-selection as well as intra-frequency cell re-selection information other than neighbouring cell related. SIB2 ::= SEQUENCE { cellReselectionInfoCommon SEQUENCE { nrofSS-BlocksToAverage INTEGER (2..maxNrofSS-BlocksToAverage) OPTIONAL, absThreshSS-BlocksConsolidation ThresholdNR OPTIONAL, rangeToBestCell RangeToBestCell OPTIONAL, q-Hyst ENUMERATED { …
