Synchronization in LTE Mobile “Switch On”
Primary and Secondary Synchronization Signals occupy 2 blocks of symbols per 10 ms (central 72 subcarriers for all channel bandwidths). An example is shown below for 72 subcarrier- (1.4 MHz)…
Uplink data transmission in LTE
The mapping of transport channels and UL control information (UCI) to physical channels is a task of the physical layer (PHY). Furthermore reference signals are provided by the physical layer…
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…
RE – groups & CFI – Control Format Indication in LTE
RE – groups & CFI – Control Format Indication in LTE is as below. RE – groups In order to support DL control information mapping, RE-groups are defined. Four useful…
Apple Confirms Announcement for iPhone 5 Next Week
In the past few weeks, pretty convincing photos of the rumored iPhone 5 have flooded the Internets, which is surprising since Apple used to be able to keep a tight…
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 –…
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…
Apple and Samsung Get Sales Bans in South Korea
Two Major Mobile Product Company ban on sales by A South Korean court after it ruled that each company had infringed each other’s patents. The Seoul Central Court has imposed a…
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…
Layer and channel relationship in LTE
The radio interface is composed of different layers in order to set up, reconfigure and release the radio bearer services. The protocol layer is composed of physical layer (layer 1),…
MIMO Principles
MIMO is effectively radio antenna technology because multiple antennas are used at the transmitter and receiver to allow a variety of signal paths to transmit the data, with separate paths…
QoS Mechanisms in Packet Networks
There are Three Types of QoS Mechanisms in Packet Networks. Control Plane Mechanisms Data Plane Mechanisms Its Tradeoffs Control Plane Mechanisms Such mechanisms include QoS policy management, signaling, and admission…