4g LTE: Cell Search Procedure and Cell Selection Procedure in LTE
Once the PLMN is selected, the next step is to select a suitable cell inside that PLMN to camp on. Then after camping on, UE will frequently…
4g LTE: LTE Signalling Radio Bearers Mapping
Signalling Radio Bearers (SRB) are used to transmit RRC and NAS messages. We know that there are total of 11 radio bearers. The first 3 types…
4g LTE: LTE Paging
Introduction: Paging is used to network initiated connection setup. Typically, paging procedure should allow UE to sleep with no receiver…
4g LTE: LTE SIB: System Information Block
In the last chapter we saw about MIB. In this chapter we shall learn about SIB. After initial cell synchronization and reading Master…
4g LTE: LTE MIB: Master Information Block
UE when it is switched on, it cannot directly establish a connection with eNB. It needs system information. This system information is divided…
4g LTE: RRC Layer In depth
States in RRC There are 2 states in RRC layer. 1. RRC_CONNECTED 2. RRC_IDLE A UE is in RRC_CONNECTED when an RRC connection has been…
4g LTE: MAC Function
1. Mapping between logical channels and transport channel. 2. Multiplexing of MAC SDU form one or more different logical channels onto the…
4g LTE: LTE channels
Channel Mapping in LTE LTE downlink channel mapping: Images: LTE Up link channel Mapping LTE Uplink Information Flow: LTE Downlink…
4g LTE: RLC Layer in LTE in depth
In this chapter we shall see Radio Link Control layer in detail. Before that we shall see an example of Data Flow: SDU: Packets received by a…
4g LTE: LTE HARQ
HARQ stands for Hybrid Automatic Repeat Request (HARQ). This is a physical layer functionality in LTE. ARQ: Automatic Repeat Request. It…