DCI stands for Downlink Control Information. It is used to carry downlink control information for one or more cells with one RNTI. It also provides the UE with necessary information such as physical layer resource allocation, power control commands, HARQ information for both uplink and downlink. …
Before we understand 5G frame structure, let us look at the below diagram: From the above image we can see that, each frame will have number of sub frames. A sub frame can have number of slots. Each slots can have a number of symbols (7 …
In this chapter we shall see in detail of 5G NR MAC PDU for RACH. After sending Msg1, UE will monitor PDCCH window and then PDCCH will indicate the location of PDSCH and PDSCH will contain RAR. Msg2 is a RAR message. We will discuss MAC …
ARQ: Automatic Repeat Request In this procedure, RLC re-transmits RLC PDU or RLC PDU segment according to RLC status report. RLC sending entity can request RLC status report as needed. The AM RLC entity provides ACK/NACK to the peer M RLC entity through the STATUS PDU. …
AM stands for “Acknowledge Mode”. In AM mode, RLC adds protocol header to the RLC SDU and if necessary, the RLC SDU can be segmented and then protocol header is updated. AM mode expects ACK/NACK from the other party. AM supports ARQ transmission. When the size …
