Download Heterogeneous Networks in LTE-Advanced by Joydeep Acharya PDF
By Joydeep Acharya
A entire precis of theoretical and functional advancements in LTE Heterogeneous Networks
The final decade has witnessed the proliferation of cellular broadband info and the fashion is probably going to extend within the coming years. present mobile networks are sick built to house this surge admired. to meet person call for and maximize earnings, a brand new paradigm to function networks is required. Heterogeneous networks, that set up an overlay of small cells with constrained insurance and transmit energy, over a macro insurance sector is the answer by means of supplying ability and insurance the place it's needed.
This e-book provides a entire evaluation of small telephone dependent heterogeneous networks in the framework of 3GPP LTE-Advanced that's the foremost enabler of present and destiny heterogeneous networks. The booklet first establishes the fundamentals of LTE criteria eight -10. anyplace appropriate, the underlying conception of instant communications is defined and the signaling and protocol features of LTE Releases 8-10 are offered. subsequent the publication provides a scientific examine of the inter telephone interference (eICIC and FeICIC) mechanisms which have been standardized in LTE releases 10 and eleven to mitigate the interference coming up in heterogeneous networks. From easy clean subframe layout and implementation, the e-book discusses extra complicated transceiver sign processing and service aggregation (CA) established mechanisms to enhance functionality. along with info, keep watch over channel improvements equivalent to more advantageous PDCCH (ePDCCH) also are discussed.
Subsequently the ebook discusses the potential of base stations being allowed to coordinate to control interference. this system, known as CoMP, has the possibility of greatly enhancing community functionality. even though numerous sensible demanding situations first must be triumph over prior to this strength may be learned. The publication offers different CoMP different types brought in LTE free up eleven, the necessary sign processing and the adjustments that have been brought in Release-11 for aiding CoMP. The e-book then provides the state-of-the-art advancements in heterogeneous networks which are presently occurring in 3GPP with the initiation of unlock 12. a complete array of latest applied sciences were brought resembling dynamic switching of small cells, new provider forms with lowered regulate signaling, dynamic reconfiguration of TDD-LTE, joint configuration of TDD and FDD through provider aggregation and finally complex MIMO sign processing with 3 dimensional beamforming. a lot of these applied sciences will paintings in unison resulting in effective operations of small cells.
The authors therefore comprehensively summarize the advances in heterogeneous networks over the past couple of years as mirrored in quite a few LTE releases after which glance forward at what to anticipate sooner or later. totally illustrated all through and with an accompanying web site together with Matlab code for simulating heterogeneous networks, LTE channel versions, and References to 3GPP requisites, contributions, and updates on contemporary standardization actions. The authors, being fascinated by LTE standardization, are good positioned to offer an exceptional view in this subject, together with necessary historical past and layout rationale.
- A complete precis of instant communications conception and useful advancements in LTE heterogeneous networks.
- Authors are specialists during this box and are lively contributors in standardization lawsuits, permitting up to date insurance of present developments
- Multiple case reviews clarify community layout optimization of varied heterogeneous community deployments.
- Accompanying site comprises Matlab code for simulating heterogeneous networks, LTE channel versions, and References to 3GPP standards, contributions, and updates on contemporary standardization activities
Essential examining for Engineers and practitioners in instant industry.
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Additional info for Heterogeneous Networks in LTE-Advanced
The peak to average power ratio (PAPR) of a signal x(t) over a period T is a commonly used metric to measure the dynamic range of the input and hence the effect of non-linear distortions , defined as max |x(t)|2 0≤t≤T . 21) PAPR = T 1∕T ∫0 |x(t)|2 dt A signal should have low PAPR to avoid non-linear distortions. However, OFDM signals have high PAPR. In the LTE downlink, Orthogonal Frequency Division Multiple Access (OFDMA) may therefore introduce non-linear distortion. No techniques for reducing PAPR in OFDM have been standardized in LTE, but the eNodeB vendors can implement their own solutions.
3. A higher-category UE can receive and transmit data at a higher rate. It can avail the advanced features of a LTE release which a lower category UE may not be able to. For example, the categories 6–8 were added in LTE Release 10 to address the bandwidth increase due to Carrier Aggregation. UE categories thus lead to service and price differentiation. 1 3GPP Standardization Process A major change from initial generations of cellular systems to latter releases is increased collaboration among various companies leading to the process of standardization.
In a LTE transmission the values of these parameters are selected based on various theoretical and practical considerations. In this section, we explain these with a series of examples. 1 Consider OFDM transmission over a fading channel with delay spread 5 μs. Let the UE velocity be 350 kmph and the carrier frequency be 4 GHz. How should the OFDM symbol duration and subcarrier spacing values be selected? The CP should be greater than or equal to the delay spread, so a prudent choice would be ∼5 μs.