Radio Operation

Download An Introduction to LTE: LTE, LTE-Advanced, SAE, VoLTE and 4G by Christopher Cox PDF

By Christopher Cox

Following on from the profitable 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 structures point, providing readers the chance to know the most important elements that make LTE the recent subject among proprietors and operators around the globe. The publication assumes not more than a uncomplicated wisdom of cellular telecommunication platforms, and the reader isn't anticipated to have any past wisdom of the advanced mathematical operations that underpin LTE.

This moment version introduces new fabric for the present country of the undefined, resembling the recent beneficial properties of LTE in Releases eleven and 12, significantly coordinated multipoint transmission and proximity companies; the most brief- and long term options for LTE voice calls, specifically circuit switched fallback and the IP multimedia subsystem; and the evolution and present kingdom of the LTE industry. It additionally extends many of the fabric from the 1st variation, similar to inter-operation with different applied sciences corresponding to GSM, UMTS, instant neighborhood quarter networks and cdma2000; extra beneficial properties of LTE complicated, particularly heterogeneous networks and site visitors offloading; info delivery within the advanced packet middle; assurance and potential 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 first and foremost introducing the structure of LTE, explaining the
techniques used for radio transmission and reception and the final operation of the approach, and concluding with extra really good issues equivalent to LTE voice calls and the later releases of the requisites. This methodical procedure allows readers to maneuver directly to take on the requirements and the extra complex texts with confidence.

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Extra info for An Introduction to LTE: LTE, LTE-Advanced, SAE, VoLTE and 4G Mobile Communications

Sample text

The process continues until the packet reaches the bottom of the protocol stack, at which point it is transmitted. The receiver reverses the process, using the headers to help it undo the effect of the transmitter’s processing. This technique is used throughout the radio access and core networks of UMTS and GSM. We will not consider their protocols in any detail at this stage; instead, we will go straight to the protocols used by LTE as part of Chapter 2. 1 From 1G to 3G Mobile telecommunication systems were first introduced in the early 1980s.

There are two aspects to this. Firstly, the requirements state that the time taken for data to travel between the mobile phone and the fixed network should be less than 5 ms, provided that the air interface is uncongested. Secondly, we will see in Chapter 2 that mobile phones can operate in two states: an active state in which they are communicating with the network and a low-power standby state. The requirements state that a phone should switch from standby to the active state, after an intervention from the user, in less than 100 ms.

There are three main technical differences between the air interfaces of cdma2000 and UMTS. 25 MHz. Secondly, cdma2000 is backwards compatible with IS-95, in the sense that IS-95 mobiles can communicate with cdma2000 base An Introduction to LTE 8 stations and vice-versa, whereas UMTS is not backwards compatible with GSM. Thirdly, cdma2000 segregates voice and optimized data onto different carrier frequencies, whereas UMTS allows them to share the same one. The first two issues hindered the penetration of WCDMA into the North American market, where there were few allocations of bandwidths as wide as 5 MHz and there were a large number of legacy IS-95 devices.

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