Book•
3G Evolution : HSPA and LTE for Mobile Broadband
31 Jul 2007-
TL;DR: In this paper, the authors present a very up-to-date and practical book, written by engineers working closely in 3GPP, gives insight into the newest technologies and standards adopted by threeGPP with detailed explanations of the specific solutions chosen and their implementation in HSPA and LTE.
Abstract: This very up-to-date and practical book, written by engineers working closely in 3GPP, gives insight into the newest technologies and standards adopted by 3GPP, with detailed explanations of the specific solutions chosen and their implementation in HSPA and LTE. The key technologies presented include multi-carrier transmission, advanced single-carrier transmission, advanced receivers, OFDM, MIMO and adaptive antenna solutions, advanced radio resource management and protocols, and different radio network architectures. Their role and use in the context of mobile broadband access in general is explained. Both a high-level overview and more detailed step-by-step explanations of HSPA and LTE implementation are given. An overview of other related systems such as TD SCDMA, CDMA2000, and WIMAX is also provided.This is a 'must-have' resource for engineers and other professionals working with cellular or wireless broadband technologies who need to know how to utilize the new technology to stay ahead of the competition.The authors of the book all work at Ericsson Research and are deeply involved in 3G development and standardisation since the early days of 3G research. They are leading experts in the field and are today still actively contributing to the standardisation of both HSPA and LTE within 3GPP. * Gives the first explanation of the radio access technologies and key international standards for moving to the next stage of 3G evolution: fully operational mobile broadband* Describes the new technologies selected by the 3GPP to realise High Speed Packet Access (HSPA) and Long Term Evolution (LTE) for mobile broadband * Gives both higher-level overviews and detailed explanations of HSPA and LTE as specified by 3GPP
Citations
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08 Dec 2009
TL;DR: It is proposed that 12 DRS in a resource block gives about balanced performance at dual-layer beamforming.
Abstract: This paper studies the density of demodulation reference signals (DRS) for dual-layer beamforming. Both the channel estimation performance and DRS overhead were considered by translating both effects into Signal Interference Noise Ratio (SINR), and then the total effective SINR was calculated. By comparing the total effective SINR of different DRS density, it is proposed that 12 DRS in a resource block gives about balanced performance at dual-layer beamforming.
4 citations
01 Nov 2014
TL;DR: The development of a femtocell scenario is discussed with simulation outcomes and two-tier macro-femto scenario for Femtocells in LTE-Sim is explored.
Abstract: LTE is an emerging wireless data communication technology to provide broadband ubiquitous Internet access. Femtocells are included in 3GPP since Release 8 to enhance the indoor network coverage and capacity. System level simulation is used for performance evaluation of LTE-Femtocellular networks. Research works on performance optimization could not be justified since there was no common reference simulator to do so until the inception of LTE-Sim. The simulation scenarios for Femtocells in LTE-Sim encompasses two-tier macro-femto scenario but to the best of our knowledge there is no published work on coding and scripting of femtocell scenario in LTE-Sim. In this paper, the development of a femtocell scenario is discussed with simulation outcomes.
4 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...Orthogonal Frequency Division Multiple Access (OFDMA) [2]....
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...{ int x_offset [9] = { -1, 0, 1, -1, 0, 1, -1, 0, 1}; int y_offset [9] = { 1, 1, 1, 0, 0, 0,-1,-1,-1}; offset = new double[2]; offset[0] = (x_offset [idCell] * side); offset[1] = (y_offset [idCell] * side);...
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...High flexibility in scheduling and interference management is achieved by narrow, mutually orthogonal subcarriers through the use of Orthogonal Frequency Division Multiple Access (OFDMA) [2]....
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...Performance of mobile system can be enhanced by evolving to emerging broadband technologies such as WiMAX [1] and LTE [2] but this may not be able to endure the exponential rise in traffic volume....
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Proceedings Article•
09 Nov 2010
TL;DR: Alamouti SFBC multi-antenna capabilities of Long Term Evolution's downlink channel will be generalized by using four transmit antennas based on a combination of SFBC and Frequency Shift Transmit Diversity FSTD, and by using MIMO 2×2 transmission scheme.
Abstract: In this paper, we will introduce Alamouti SFBC multi-antenna capabilities of Long Term Evolution's downlink channel. Alamouti's simple algorithm will be generalized by using four transmit antennas based on a combination of SFBC and Frequency Shift Transmit Diversity FSTD, and by using MIMO 2×2 transmission scheme. To prove the efficiency of these techniques, we will consider spatial correlation between multiple antennas and frequency correlation between OFDM subcarriers. We will also present a theoretical demonstration of the correlations expressions. Our simulations results will confirm the performance degradation caused by the spatial and frequency correlation, and the strength of Alamouti SFBC against the spatial correlation. The paper demonstrate the advantage offered by using FSTD technique to combat frequency correlation.
4 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...LTE supports two types of multi-antenna transmission schemes [1], [2], the transmit diversity that improves the SINR (Signal to Interference and Noise Ratio), and the spatial multiplexing that shares SINR between parallel streams....
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01 Nov 2013
TL;DR: The area of study proposed in this paper is the evaluation of the Quality of Service provided by a Long Term Evolution (LTE) cellular data network and a methodology for QoS assessment based on a relatively small set of Key Performance Indicators (KPIs) is devised.
Abstract: The area of study proposed in this paper is the evaluation of the Quality of Service (QoS) provided by a Long Term Evolution (LTE) cellular data network. It is aimed to address the gap between the technical capabilities and the QoS experienced by the user. The analysis is based on the live data that are collected on commercial cellular network and compared against broadband wireless LAN. A methodology for QoS assessment based on a relatively small set of Key Performance Indicators (KPIs) is devised. The measured data are used to verify the proposed methodology.
4 citations
01 Dec 2017
TL;DR: A proposed protocol called Robust Evolved Packet System Authentication and Key Agreement protocol (REPS-AKA) introduced to solve the security vulnerabilities of standard one is introduced, containing a pre-authentication method based on Globally Unique Temporary Identifier (GUTI).
Abstract: User authentication is very important in mobile networks; Evolved Packet System Authentication and Key Agreement (EPS-AKA) protocol used in 4th generation (LTE) networks to allow legitimate users access services This algorithm has many security weaknesses, as DOS attack, reveal of user id, MITM, and Replay attack In this paper, a proposed protocol called Robust Evolved Packet System Authentication and Key Agreement protocol (REPS-AKA) introduced to solve the security vulnerabilities of standard one The proposed protocol contain a pre-authentication method based on Globally Unique Temporary Identifier (GUTI); this technique is efficient for mobile networks as a pre-authentication manner To verify the efficiency of the protocol we used a tool called Scyther Analysis done, using C language, by calculating the execution time for both algorithms Validation for the proposed protocol, using C# language, is implemented using client-server application program
4 citations