S-CRITERION The cell selection criterion S is a pre-condition for suitable cells. The conditions for E-UTRAN, UTRAN FDD and GSM cells are listed in the figure. R – CRITERION – CELL RESELECTION The cell reselection evaluation process depends on whether Hierarchical Cell Structure (HCS) is used or not. In order to perform cell reselection UE … Read more
PLMN Selection Process in LTE The UE scans all RF channels in the UTRAN band according to its capabilities to find available PLMNs. On each carrier, the UE searches for the strongest cell according to the cell search procedure (refer cell searching) and read its system information in order to find out which PLMN the … Read more
Based on DCI formats In LTE Three types of allocation are used: type 0: DCI formats 1, 2, 2A type 1: DCI formats 1, 2, 2A type 2: DCI formats1A, 1B, 1C, 1D One bit in the header is indicating if DCI formats 1, 2, 2A are of type 0 or type 1. Type 0: … Read more
The scheduling is performed on cell basis. The two main functions are to decide which UE(s) shall be scheduled, the number of resources and the MCS to be applied. Furthermore the scheduler needs to be QoS aware. There is priority given to random access responses, control data, HARQ retransmissions. The channel quality may be taken … Read more
A variety of scheduling strategies is available in LTE. The scheduling strategy is based on a certain metric. – Round-Robin. No quality indication is taken into consideration. The resources are mainly shared in an equal manner. – Max C/I. The UE with the best channel conditions gets the highest priority. The cell throughput is maximized. … Read more
Logical channels are in a one-to-one fashion associated with radio bearers. Logical channel types are used to distinguish the type of information transmitted within the attached radio bearer. The two major groups of logical channel types are therefore control channels for signaling and traffic channels for IP user data. Currently the following logical channel types … Read more
Transport channels are used as the basic transmission service offered by layer 1 to MAC. MAC will use transport channels to multiplex and demultiplex logical channels onto and from them. In contrast to logical channel types, referring to the type of information transmitted, transport channel types are used to indicate the transport characteristics. This means … Read more
PISCATAWAY, N.J., USA. (October 29, 2012) – AT&T, Google and Starbucks today announced that they have joined the Power Matters Alliance (PMA). Founded by Powermat Technologies and Procter & Gamble, the PMA’s Honorary Chairman is Google’s Vint Cerf – one of the fathers of the Internet – and its board now also includes AT&T, Duracell, … Read more
Feature for feature, the iPad mini mainly bests its rivals in the 7-inch tablet market, but it does so at a price that’s 65 percent higher than those competitors. The mini has a larger display than Amazon’s Kindle Fire HD and Google’s Nexus 7. Its screen measures 7.9 inches diagonally, while the Fire and Nexus … Read more
T-Mobile USA has signed a US$2.4 billion deal with Crown Castle that lets the towers operator have sole rights to use and lease out 6,400 of T-Mobile’s towers for the next 28 years. The deal also includes the sale of 800 towers to Crown Castle. The payment of the $2.4 billion will be a single … Read more