5G NR MAC Control Elements
In this chapter we shall look at the MAC CE (MAC Control Elements). In following chapters we shall discuss in-detail of some of the CEs. MAC…
5G NR MAC Uplink Grant Request
In this chapter we shall learn, in how many ways a UE can request uplink grant to gNB. UE can request uplink grant in 3 different ways: 1.…
5G NR MAC PDU for RACH
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…
5G NR MAC Sub Headers, MAC PDU and MAC Control Elements
Difference between 5G NR MAC PDU and LTE MAC PDU: From the above image we can infer below points: 1. A MAC PDU in LTE has a single header that…
5G NR MAC Layer Introduction
5G NR Protocol stack is divided into 2 planes: User Plane and Control Plane. User Plane is used to transfer user data and control plane is…
5G NR RLC ARQ Procedure
ARQ: Automatic Repeat Request In this procedure, RLC re-transmits RLC PDU or RLC PDU segment according to RLC status report. RLC sending…
5G NR RLC UM PDU and data transfer procedure
UM stands for “Unacknowledged Mode”. In UM mode, RLC adds protocol header to RLC SDU and if required SDU can be segmented. The…
5G NR RLC TM PDU and data transfer procedure
In TM mode, RLC does not perform any operations on the SDU and it is transmitted transparently. It will only buffer data on Tx side. No RLC…
5G NR RLC State variables, Constants and Timers
In this chapter we shall see the state variables that are used in UM and AM mode. SN = Sequence Number. All state variables related to AM data…
5G NR RLC entity handling Procedures and SDU discard procedure
In this chapter we shall see how an RLC entity is established, re-established and released. RLC entity establishment procedure When any upper…