LTE

DL scheduler in LTE

The DL scheduler is spit into 3 functional parts: 1.The Static Scheduler: Which assigns a fixed amount of Transport Blocks as well as PDCCH and PDSCH resources for the BCCH...
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Radio Bearer in LTE

There are 2 types of Radio Bearers (RB) in LTE:  To carry signaling. There are called the SRB (Signaling Radio Bearer) To carry user data. There are associated with an...
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What is EPS Bearer in 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...
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How Synchronization Channel Works in LTE?

After the power on, the UE knows:  the UE category and capability. the preferred PLMN. the carriers. The UE needs to know: The frame synchronization to be able to decode...
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access, BCH, cell, lte, lte sync, no of primary channel identifier in lte, radio, resource block, rrc, step in lte, sync, telecom

Synchronization & BCH for TDD Frame in LTE

The Primary synchronization signal (PSS): is placed at the third symbol in subframes #1 and #6. The secondary synchronization signal (SSS): is placed at the last symbol in subframes #0...
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access, BCH, cell, d-bch lte, lte, lte sync, lte tdd pbch, radio, rrc, step in lte, sync, telecom

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...
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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...
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System information & DL-SCH data in LTE

System information 1920 bits or 1728 bits are to be transmitted for normal or extended CP resp.. The PBCH is transmitted every 40 ms. The bit scrambling depends on the...
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cell, lte, number of symbols used for phich, ofdma, PBCH, pbch mapping, sch lte, symbol, telecom

How Time structure in LTE?

EUTRAN OFDM symbols have a basic duration of 66.667 ?s. This means up to 2048 complex samples per OFDM symbol in time domain representation. A cyclic prefix is pretended to...
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cell, eutran, lte, lte mbms, prefix in lte, telecom, time slot of lte, Time structure in LTE

Synchronization of signals in LTE

504 different physical-layer cell ids are composed of 168 different physical-layer cell id groups each of 3 physical layer ids within the group There are - primary synchronization signal –...
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cell, harq, lte, telecom, UL and DL control, UL-SCH

How Reference signals Map in LTE?

For channel estimation different types of reference signals are in use: - Cell specific reference signals. - MBSFN reference signals. - UE specific reference signals CELL-SPECIFIC REFERENCE SIGNALS These signals...
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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...
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