By Christopher Cox
Following on from the winning first version (March 2012), this booklet supplies a transparent clarification of what LTE does and the way it really works. The content material is expressed at a structures point, supplying readers the chance to understand the foremost elements that make LTE the new subject among proprietors and operators around the globe. The booklet assumes not more than a simple wisdom of cellular telecommunication platforms, and the reader isn't anticipated to have any prior wisdom of the complicated mathematical operations that underpin LTE.
This moment version introduces new fabric for the present nation of the undefined, akin to the hot positive aspects of LTE in Releases eleven and 12, significantly coordinated multipoint transmission and proximity companies; the most brief- and long term recommendations for LTE voice calls, specifically circuit switched fallback and the IP multimedia subsystem; and the evolution and present nation of the LTE marketplace. It additionally extends a few of the fabric from the 1st version, corresponding to inter-operation with different applied sciences corresponding to GSM, UMTS, instant neighborhood quarter networks and cdma2000; extra positive aspects of LTE complicated, significantly heterogeneous networks and site visitors offloading; information shipping within the advanced packet center; assurance and ability estimation for LTE; and a extra rigorous remedy of modulation, demodulation and OFDMA. the writer breaks down the procedure into logical blocks, by way of at the start introducing the structure of LTE, explaining the
techniques used for radio transmission and reception and the general operation of the procedure, and concluding with extra really expert themes resembling LTE voice calls and the later releases of the requirements. This methodical method permits readers to maneuver directly to take on the requisites and the extra complicated texts with confidence.
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Extra resources for An Introduction to LTE: LTE, LTE-Advanced, SAE, VoLTE and 4G Mobile Communications
8 shows the resulting architecture and the way in which that architecture developed from that of UMTS. In the new architecture, the evolved packet core (EPC) is a direct replacement for the packet switched domain of UMTS and GSM. There is no equivalent to the circuit switched domain, which allows LTE to be optimized for the delivery of data traffic, but implies that voice calls have to be handled using other techniques that are introduced below. The evolved UMTS terrestrial radio access network (E-UTRAN) handles the EPC’s radio communications with the mobile, so is a direct replacement for the UTRAN.
The main output from the study was a specification for a system known as LTE-Advanced , in which the main requirements were as follows. LTE-Advanced was required to deliver a peak data rate of 1000 Mbps in the downlink, and 500 Mbps in the uplink. In practice, the system has been designed so that it can eventually deliver peak data rates of 3000 and 1500 Mbps respectively, using a total bandwidth of 100 MHz that is made from five separate components of 20 MHz each. Note, as before, that these figures are unachievable in any realistic scenario.
It communicates with the radio access network over the air interface, also known as the radio interface. The direction from network to mobile is known as the downlink (DL) or forward link and the direction from mobile to network is known as the uplink (UL) or reverse link. A mobile can work outside the coverage area of its network operator by using the resources from two public land mobile networks: the visited network, where the mobile is located and the operator’s home network. This situation is known as roaming.
An Introduction to LTE: LTE, LTE-Advanced, SAE, VoLTE and 4G Mobile Communications by Christopher Cox