Different Tasks and States of RRC Protocol in LTE-EUTRAN The RRC protocol for EUTRAN is responsible for the basic configuration of the radio protocol stack. But one should note, that some radio management functions (scheduling, physical resource assignment for physical channels) are handled by layer 1 and layer 2 autonomously. MAC and layer 1 signaling … Read more
Handover Process in LTE In LTE, the handover process involves transferring a mobile device’s connection from one cell to another seamlessly. It includes the following key steps: Measurement: The mobile device continuously measures signal strength and quality from neighboring cells. Triggering: When certain threshold values are met, a handover is triggered. This can be due … Read more
How Downlink Control Information or DCI in LTE? DCI serves as a means of communication from the network infrastructure (eNodeB) to the user equipment (UE), providing essential instructions and information for efficient downlink data transmission. This information includes details about resource allocation, modulation schemes, transmission power control, and more, enabling UEs to accurately decode and … Read more
When the UE has obtained system information, it has to request an RRCconnection. Like it has no dedicated resources, the UE requests the connection using the Random Access Procedure using common uplink resources. At the end of the procedure, the UE is RRC connected UE and eNodeB are able to exchange data using dedicated radio … Read more
The PDCCH, Physical Downlink Control Channel, allocates the DL and UL resources. There is one PDCCH per sub-frame. It helps the UE retrieve the transport blocks from the PDSCH: Allocated RB Modulation and Coding Scheme (MCS) Multi-antenna transmission PDCCH Shared between all UE of the cell Each TTI contains an aggregation of PDCCH allowing … Read more
Random access procedure is performed for the following five events: • Initial access from RRC_IDLE; • RRC Connection Re-establishment procedure; • Handover; • DL data arrival during RRC_CONNECTED requiring random access procedure; • UL data arrival during RRC_CONNECTED requiring random access procedure; E.g. when UL synchronization status is “non-synchronized” or there are no PUCCH resources for … Read more
Based on DCI formats In LTE Three types of allocation are used: type 0: DCI formats 1, 2, 2A type 1: DCI formats 1, 2, 2A type 2: DCI formats1A, 1B, 1C, 1D One bit in the header is indicating if DCI formats 1, 2, 2A are of type 0 or type 1. Type 0: … Read more