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
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TL;DR: Simulations reveal that the proposed AMC scheme with power control and symbol interleaving can provide a maximum 10.2% increase of average beam spectral efficiency and a maximum of 8-dB power gain compared with a conventional AMC scheme.
Abstract: SUMMARY
The adaptive modulation and coding (AMC) scheme is mandatory for modern wireless communication systems to overcome inevitable channel impairments. Many of the limitations using AMC are due to the long round-trip delay of a satellite system. This paper proposes an efficient AMC scheme with power control and symbol interleaving that can be effectively applied to satellite systems. In particular, we focus on mobile satellite systems that have maximum compatibility in a Long Term Evolution system. Simulations reveal that the proposed scheme can provide a maximum 10.2% increase of average beam spectral efficiency and a maximum of 8-dB power gain compared with a conventional AMC scheme. Copyright © 2012 John Wiley & Sons, Ltd.
5 citations
Cites methods from "3G Evolution : HSPA and LTE for Mob..."
...In this paper, we consider 3GPP LTE standard [1, 3]....
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TL;DR: This paper considers the problem of determining optimal assignments sequentially over a given time horizon, where consecutive assignments are coupled by constraints that control the cost of reconfiguration, and develops fast approximation and online algorithms for this problem with provable approximation guarantees and competitive ratios.
Abstract: Resource assignment problems occur in a vast variety of applications, from scheduling problems over image recognition to communication networks. Often these problems can be modeled by a maximum weight matching problem in (bipartite) graphs or generalizations thereof, and efficient and practical algorithms are known for these problems. Although in some of the applications an assignment of the resources may be needed only once, in many of these applications, the assignment has to be computed more often for different scenarios. In that case it is often essential that the assignments can be computed very fast. Moreover, implementing different assignments in different scenarios may come with a certain cost for the reconfiguration of the system. In this paper, we consider the problem of determining optimal assignments sequentially over a given time horizon, where consecutive assignments are coupled by constraints that control the cost of reconfiguration. We develop fast approximation and online algorithms for this problem with provable approximation guarantees and competitive ratios. Moreover, we present an extensive computational study about the applicability of our model and our algorithms in the context of orthogonal frequency division multiple access (OFDMA) wireless networks, finding a significant performance improvement for the total bandwidth of the system using our algorithms. For this application (the downlink of an OFDMA wireless cell) , the run time of matching algorithms is extremely important, having an acceptable range of a few milliseconds only. For the considered realistic instances, our algorithms perform extremely well: the solution quality is, on average, within a factor of 0.8–0.9 of optimal off-line solutions, and the running times are at most 5 ms per phase even in the worst case. Thus, our algorithms are well suited to be applied in the context of OFDMA systems.
5 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...It is conveyed via the physical downlink control channels Dahlmann et al. (2008)....
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...For most urban wireless communication settings, where the movement speed of the objects in the environment is low to medium, this assumption is appropriate (Dahlmann et al. 2008)....
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...Both of these scenario settings are based on a set of common system parameters, which we choose equally and that represent the downlink transmission in 3GPP LTE (Long Term Evolution) OFDMA systems (3rd Generation Partnership Project 2008, Dahlmann et al. 2008)....
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28 Mar 2013
TL;DR: This paper proposes a graph-based method using minimum cut operations to partition a planning instance automatically into an appropriate number of k sub-problems and demonstrates the benefits of this approach by numerical evaluation of exemplary application to the problem of planning LTE cell site locations in an urban environment.
Abstract: Common approaches for partitioning cell site planning problems into smaller instances typically suffer from the lack of knowledge about the number of clusters k that is appropriate for the particular problem. When applying an iterative processing over methods such as the k-means algorithm or the related k-medoids approach to determine the optimum k, the computational effort can be higher than solving the original problem instance directly. This is particularly the case if the optimum k is small, which happens most likely in urban environments where the user density and the number of cells are high. In this paper, we propose a graph-based method using minimum cut operations to partition a planning instance automatically into an appropriate number of k sub-problems. We demonstrate the benefits of this approach by numerical evaluation of exemplary application to the problem of planning LTE cell site locations in an urban environment.
5 citations
Cites methods from "3G Evolution : HSPA and LTE for Mob..."
...When applying an iterative processing over methods such as the k-means algorithm or the related k-medoids approach to determine the optimum k, the computational effort can be higher than solving the original problem instance directly....
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...According to the LTE system specification [2], we distinguish 16 Channel Quality Indicators (CQI) to describe link quality from eNBs to users....
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01 Nov 2010
TL;DR: The proposed Person Wide Web (PWW), a new type of location based web service architecture that effectively recognizes the location specific web resources to the mobile device user based on his geographical position, has a potential to open up a new market area of provider triggered wireless data services.
Abstract: Due to the recent advancements of Wi-Fi technologies, people can receive various types of data services via their portable devices such as laptop, smart-phone, and PDA. Especially, as the localization technologies are well developed, the LBS (Location Based Service) is recognized as a promising technology in the upcoming ubiquitous era. In most of LBS applications, users generally tend to visit shops, restaurant and public facilities in his surroundings. To exploit this feature, we propose Person Wide Web (PWW), a new type of location based web service architecture that effectively recognizes the location specific web resources to the mobile device user based on his geographical position. Among so-many resources in the WWW, only the things closely located to the user, make up his PWW. By using the PWW, various location specific data services such as shop advertisement, restaurant menu, and discount coupon, are expected to form a new type of business model in which marketers can actively promote the mobile device users to gladly use their services. We implemented a prototype of PWW system on Android platform and saw that our prototype has reasonable performance on service establishment and message delivery time. We believe the PWW has a potential to open up a new market area of provider triggered wireless data services.
5 citations
08 May 2011
TL;DR: A Signal-Strength based Medium Access Protocol (SSMAP) is proposed to orchestrate the channel access in OFDMA based mobile ad hoc networks and introduces a sub-channel selection criterion which is based on the interference power of the subchannels in the receiver side aiming to reduce the co-channel interference and reduce the signaling overhead.
Abstract: Orthogonal Frequency Division Multiple Access (OFDMA) has been used as a multiple access scheme in many infrastructure based wireless networks, such as IEEE 802.16, 3GPP LTE etc. because of its prominent features. Interestingly, there are only a few proposals on implementing OFDMA in mobile ad hoc networks. In this paper, a Signal-Strength based Medium Access Protocol (SSMAP) is proposed to orchestrate the channel access in OFDMA based mobile ad hoc networks. SSMAP introduces a sub-channel selection criterion which is based on the interference power of the subchannels in the receiver side aiming to reduce the co-channel interference and reduce the signaling overhead. The proposed sub-channel allocation scheme is fully distributed and each node does not need to exchange periodic update information with its neighbors. The simulation results illustrate the major performance advantages of SSMAP compared to prior channel access protocols, such as signal-radio multi-channel and multi-radio multi-channel in wireless ad hoc networks.
5 citations