Richard Jhon 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) / single antenna case. During the initial cell search, the mobile station searches for the strongest cell. It then … Read more
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 which do not transfer any higher layer information. Logical channel mapping is provided by the MAC layer. Physical channel for … Read more
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 cell id and is starting in radio frames 0, 4, 8 … . PBCH uses QPSK. I.e. 960 … Read more
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 symbols are bundled, useful in the sense that RE’s carrying the cellspecific reference symbols … Read more
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 lock on their secrets before they hold announcement events like this. Apple has confirmed the worst kept secret about its forthcoming press conference – that … Read more
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 – based on a frequency domain Zadoff-Chu sequence indicating the physical layer id, – secondary synchronization signal indicating the physical layer cell id group. The mapping … Read more
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 are transmitted for all non-MBSFN subframes only where subcarrier spacing is 15 kHz. In MBSFN subframes only the first … Read more
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 sales ban on several devices as a result: Apple’s Iphone 3GS, Iphone 4 and the original Ipad and Ipad 2 tablets, along with Samsung’s GalaxyS … Read more
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 the symbol. The size of the cyclic prefix can be chosen from three options: Normal prefix for 15 kHz: This is the standard option. It … Read more
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), data link layer (layer2), and the network layer (layer3). In the E-UTRAN layer 2 is divided into two sub-layers: … Read more