Tag Archives: telecom

Handover Process in LTE

The source eNB issues a HANDOVER REQUEST message to the target eNB passing the necessary information to prepare the HO on target side (UE X2 signaling context reference at source eNB, UE S1 EPC signaling context reference, target cell ID,…

What is EPS Bearer in LTE?

Eps bearer LTE EPS is a connection-oriented transmission network and, as such, it requires the establishment of a “virtual” connection between two endpoints (e.g. a UE and a PDN-GW) This virtual connection is called an “EPS Bearer” It provides a…

How Downlink Control Information or DCI in LTE?

Downlink Control Information or DCI in LTE The PDCCH carries Downlink Control Information or DCI to indicate the resource assignment in UL or DL for one RNTI. A DCI can convey various pieces of information, but the useful content depends…

Packet Data Convergence Protocol (PDCP) in LTE

What is pdcp in lte: – PDCP means Packet Data Convergence Protocol means it convert data at protocol level let’s check its function at user plane and control plane in details. The main services provided by the Packet Data Convergence Protocol…

Timing Advance in LTE

Timing advance lte what is timing advance in lte: -The eNB measures the required timing advance based on the received UE signal arrival time. It commands the UE to adjust the transmission time. This is performed on a per-need basis.…

Resource Block & Physical Resource Block in LTE

What is Resource block in lte? :- A resource block is the smallest unit of resources which allocated to a user. The resource block is 1 slot long in time and 180 kHz wide in frequency. Resource Block Multiplex multiple…

What is the difference between LTE and VOLTE?

What is VOLTE:- Volte (voice over lte) refers to voice calls made through a 4G LTE network rather than traditional calls made using csfb (circuit-switched fall-back), a system that switches from 4g back to 2g or 3g technology before connecting…

Cell selection and reselection in LTE UE

To get service from the selected PLMN, the UE performs two types of  procedures: LTE cell selection and LTE cell reselection CELL SELECTION in LTE Upon PLMN selection, LTE UE uses “cell selection” for fast cell searching to camp on.…

State of RRC in LTE

RRC uses the following states: RRC_Idle: •The UE is not connected. There is no radio link. •The network knows that the UE is present on the network and is able to reach it in case of incoming call. •The UE…

Downlink Power control in LTE

The eNodeB determines the downlink transmit energy per resource element (lte epre). Downlink cell-specific reference-signal (RS) lte epre is constant across the downlink system bandwidth and constant across all subframes until different cell-specific RS power information is received. The downlink RS…

OFDM implementation in Detail

A typical OFDM transmitter is shown on the following figure. To reduce the amount of RF hardware required for OFDM the modulation process is split into two parts. A first part uses the inverse discrete Fourier transform (IDFT) or one…

What is AMC & its Algorithm in LTE

The effective Eb/No and hence the spectral efficiency depend on BLER. However there are QoS requirements which also have to be considered. Taking both into account leads to a target BLER. AMC is in use in order to tune BLER…