Tag Archives: enodeb


Random Access Procedure in LTE

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

Step of RRC Connection Setup in LTE

When the UE is powered up, it has to be RRC connected to be able to exchange data and signaling with the network. After the RRC connection, the Initial network

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

MIMO Multi User in LTE

MIMO-MU = Multi user It is used only in Uplink. MIMO-MU does not increase the individual user’s data rate but it does offer cell capacity gains that are similar to,

MIMO = Multiple Input Multiple Output in LTE

MIMO = Multiple Input Multiple Output 2 or more transmitters and 2 or more receivers. MIMO transmits several streams whereas SIMO or MISO transmits only one stream. If there are

H-ARQ Mechanism in DL

1. The Transport block is transmitted to the UE on the PDSCH. 2. The UE receives it but it is erroneous. The TB is stored in a buffer. 3. The

what is Radio Retransmission in LTE?

The radio retransmission mechanism is called Hybrid Automatic Request (H-ARQ). H-ARQ allows to retransmit fastly erroneous blocks between the eNodeB and the UE. It avoids long retransmission between 2 TCP

LTE : Data Transmission in DL

The data in DL are sent on the PDSCH  A minimum of 2 RBs are allocated by the eNodeBs.  A RB is 12 sub-carriers on a slot (7 symbols).  The

Traffic Operation Overview in LTE

DL Data Transmission in LTE UL Data Transmission in LTE DL and UL schedulers are running in the eNodeB.  From the following inputs, the eNodeB schedules the data on the

QoS Parameters of LTE

The QoS Class Identifier (QCI) is a scalar that is used as a reference to access node-specific parameters that control bearer level packet forwarding treatment (e.g. scheduling weights, admission thresholds,