By Christopher Cox
Following on from the winning first version (March 2012), this e-book provides a transparent rationalization of what LTE does and the way it really works. The content material is expressed at a platforms point, providing readers the chance to understand the most important components that make LTE the new subject among proprietors and operators around the globe. The publication assumes not more than a simple wisdom of cellular telecommunication platforms, and the reader isn't really anticipated to have any past wisdom of the complicated mathematical operations that underpin LTE.
This moment variation introduces new fabric for the present nation of the undefined, akin to the hot good points of LTE in Releases eleven and 12, particularly 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 kingdom of the LTE marketplace. It additionally extends a few of the fabric from the 1st version, equivalent to inter-operation with different applied sciences reminiscent of GSM, UMTS, instant neighborhood region networks and cdma2000; extra positive factors of LTE complicated, particularly heterogeneous networks and site visitors offloading; info shipping within the advanced packet center; insurance and skill estimation for LTE; and a extra rigorous remedy of modulation, demodulation and OFDMA. the writer breaks down the method into logical blocks, by way of at first introducing the structure of LTE, explaining the
techniques used for radio transmission and reception and the final operation of the method, and concluding with extra really expert subject matters reminiscent of LTE voice calls and the later releases of the requirements. This methodical procedure permits readers to maneuver directly to take on the standards 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
Reproduced by permission of ETSI. 17 GUTI reallocation procedure. (a) Non access stratum messages. (b) Message transport using the access stratum. GUTI Reallocation Command , the MME can give the mobile a new globally unique temporary identity. In response, the mobile sends the MME an acknowledgement using an EMM GUTI Reallocation Complete. 17(b). The usual S1-AP messages are known as Uplink NAS Transport and Downlink NAS Transport , while the usual RRC messages are known as UL Information Transfer and DL Information Transfer .
The 36 series is devoted to the techniques that are used for radio transmission and reception in LTE and is an important source of information for this book. In the other series, some speciﬁcations are applicable to UMTS alone, some to LTE alone and some to both, so it can be tricky to establish which speciﬁcations are the relevant ones. To help deal with this issue, the book contains references to all the important speciﬁcations that we will use. 0. Here, TS stands for technical speciﬁcation, 23 is the series number and 401 is the number of the speciﬁcation within that series.
3rd Generation Partnership Project (2011) FTP Directory. org/specs/latest/ (accessed 12 December, 2011). 21. 3rd Generation Partnership Project (2011) FTP Directory. org/Information/ WORK_PLAN/Description_Releases/ (accessed 12 December, 2011). 2 System Architecture Evolution This chapter covers the high-level architecture of LTE. We begin by describing the hardware components in an LTE network and by reviewing the software protocols that those components use to communicate. We then look in more detail at the techniques used for data transport in LTE, before discussing the state diagrams and the use of radio spectrum.