Tag Archives: lte downlink

DL & UL Physical Channel in LTE

How Physical channel of LTE works in UL & DL?A distinction has to made between:  The Physical channel The Physical signal The DL physical channels are: Physical DL Shared Channel (PDSCH) It is a shared channel used to carry user…

From the Transport to the Physical Channel in LTE

Transport channels are then mapped on the physical channels which are sent over the air interface A CRC is calculated and appended to each TB. It allows the receiver to detect errors. It is used by retransmission mechanisms like H-ARQ…

How Transport Channel Work in LTE?

A transport channel defines how and with what characteristics the information is transmitted. Inherited from the WCDMA, data on the transport channel is organized into “Transport Blocks”, TBs. A Transport block can be transmitted every TTI = 1 ms The…

How Many Logical Channel in LTE ?

The following control logical channels have been defined by the 3GPP: BCCH, Broadcast Control Channel, used for the transmission of system control information. A UE needs to decode it before requesting a connection. PCCH, Paging Control Channel, is a downlink…

How Channel Architecture in LTE?

A Logical Channel is defined by the type of information it carries. Logical channels are classified into control and traffic channels. Answer to the question: what is it being transported? A Transport Channel is defined by how and with what…

How MAC Protocol Work In LTE?

The MAC protocol provides the following services: Logical Channel to Transport channel mapping Scheduling: There is no dedicated channel allocated to a UE. Time and frequency resources are dynamically shared between the users in DL and UL. The scheduler is…

Radio Link Control (RLC) protocol services in LTE

The Radio Link Control (RLC) protocol provides the following services: Segmentation of SDU according to the size Re-Segmentation of PDU Radio Bearer to logical channel mapping Transfer of data in 3 modes: TM Transparent Mode Without retransmission. For real-time service.…

Current LTE Features and Benefits of LTE

Here i write current LTE Features and benefits of LTE in small point note which will short description of LTE technology. Current LTE version features The following are the features of LTE Technology: Spectral efficiency (5 bps/Hz DL, 2.5 bps/Hz…

Space time block coding based transmit antenna diversity STTD in UMTS

The TX diversity methods in the open-loop mode are as below Space time-block coding-based transmit-antenna diversity (STTD) Time-switched transmit diversity (TSTD). In UMTS STTD the data to be transmitted is divided between two UMTS transmission antennas at the base station…

Why to select UE Distribution, Channel Model and TDD Specific Configuration properly during LTE Planning

Here I write down about How to UE Distribution and Channel Model : Pedestrian vs High Mobility, TDD Specific Uplink and Downlink Configuration and Power Boosting Configuration selection during initial planning of LTE Network and why it needs to take…