Download or read book Cognitive Interference Management in Heterogeneous Networks written by Dania Marabissi and published by Springer. This book was released on 2015-06-24 with total page 86 pages. Available in PDF, EPUB and Kindle. Book excerpt: This brief investigates the role of interference management in Heterogeneous Networks (Het Nets), focusing on cognitive approaches and the use of beamforming. Key concepts of Het Nets are introduced and different deployment strategies are examined, such as sharing the same frequency band of the macro cells or using new high frequency bands. Particular attention is devoted to co-channel deployment and to the problem of interference management, addressing various strategies that can be adopted to handle the interference between the cells. In addition, the brief explores cognitive small cells which are able to avoid or limit interference by using suitable beamforming and resource allocation schemes. The suggested solutions are supported by numerical results in terms of performance evaluations and comparisons.

Download or read book Heterogeneous Cellular Networks written by Rose Qingyang Hu and published by John Wiley & Sons. This book was released on 2013-04-03 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: A timely publication providing coverage of radio resource management, mobility management and standardization in heterogeneous cellular networks The topic of heterogeneous cellular networks has gained momentum in industry and the research community, attracting the attention of standardization bodies such as 3GPP LTE and IEEE 802.16j, whose objectives are looking into increasing the capacity and coverage of the cellular networks. This book focuses on recent progresses, covering the related topics including scenarios of heterogeneous network deployment, interference management in the heterogeneous network deployment, carrier aggregation in a heterogeneous network, cognitive radio, cell selection/reselection and load balancing, mobility and handover management, capacity and coverage optimization for heterogeneous networks, traffic management and congestion control. This book enables readers to better understand the technical details and performance gains that are made possible by this state-of-the-art technology. It contains the information necessary for researchers and engineers wishing to build and deploy highly efficient wireless networks themselves. To enhance this practical understanding, the book is structured to systematically lead the reader through a series of case-studies of real world scenarios. Key features: Presents this new paradigm in cellular network domain: a heterogeneous network containing network nodes with different characteristics such as transmission power and RF coverage area Provides a clear approach by containing tables, illustrations, industry case studies, tutorials and examples to cover the related topics Includes new research results and state-of-the-art technological developments and implementation issues

Download or read book Heterogeneous Networks in LTE Advanced written by Joydeep Acharya and published by John Wiley & Sons. This book was released on 2014-02-18 with total page 277 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive summary of theoretical and practical developments in LTE Heterogeneous Networks The last decade has witnessed the proliferation of mobile broadband data and the trend is likely to increase in the coming years. Current cellular networks are ill equipped to deal with this surge in demand. To satisfy user demand and maximize profits, a new paradigm to operate networks is needed. Heterogeneous networks, that deploy an overlay of small cells with limited coverage and transmit power, over a macro coverage area is the solution by providing capacity and coverage where it is needed. This book presents a comprehensive overview of small cell based heterogeneous networks within the framework of 3GPP LTE-Advanced which is the major enabler of current and future heterogeneous networks. The book first establishes the basics of LTE standards 8 -10. Wherever relevant, the underlying theory of wireless communications is explained and the signaling and protocol aspects of LTE Releases 8-10 are presented. Next the book presents a systematic study of the inter cell interference (eICIC and FeICIC) mechanisms that have been standardized in LTE releases 10 and 11 to mitigate the interference arising in heterogeneous networks. From simple blank subframe design and implementation, the book discusses more advanced transceiver signal processing and carrier aggregation (CA) based mechanisms to improve performance. Besides data, control channel enhancements such as enhanced PDCCH (ePDCCH) are also discussed. Subsequently the book discusses the possibility of base stations being allowed to coordinate to manage interference. This technique, called CoMP, has the potential of vastly improving network performance. However several practical challenges first have to be overcome before this potential can be realized. The book presents the different CoMP categories introduced in LTE release 11, the required signal processing and the changes that were introduced in Release-11 for supporting CoMP. The book then presents the state of the art developments in heterogeneous networks that are currently taking place in 3GPP with the initiation of Release 12. A whole array of new technologies have been introduced such as dynamic switching of small cells, new carrier types with reduced control signaling, dynamic reconfiguration of TDD-LTE, joint configuration of TDD and FDD via carrier aggregation and lastly advanced MIMO signal processing with three dimensional beamforming. All these technologies will work in unison leading to efficient operations of small cells. The authors thus comprehensively summarize the advances in heterogeneous networks over the last couple of years as reflected in various LTE releases and then look ahead at what to expect in the future. Fully illustrated throughout and with an accompanying website including Matlab code for simulating heterogeneous networks, LTE channel models, and References to 3GPP specifications, contributions, and updates on recent standardization activities. The authors, being involved in LTE standardization, are well placed to give an excellent view on this topic, including valuable background and design rationale. A comprehensive summary of wireless communications theory and practical developments in LTE heterogeneous networks. Authors are experts in this field and are active members in standardization proceedings, enabling up-to-date coverage of current developments Multiple case studies explain network design optimization of various heterogeneous network deployments. Accompanying website includes Matlab code for simulating heterogeneous networks, LTE channel models, and References to 3GPP specifications, contributions, and updates on recent standardization activities Essential reading for Engineers and practitioners in wireless industry.

Download or read book Intercell Interference Managment in LTE A Heterogeneous Network written by Suman Ghimire and published by LAP Lambert Academic Publishing. This book was released on 2013 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: Frequency spectrum has become a rare resource these days; another mean is to be looked after to improve the existing wireless technology. Which gives rise to concept of Heterogeneous Network. So, LTE-A employs Heterogeneous Network which consist of several Low power nodes within one High power node. In this book, Macro eNB is a High power node and Femto eNB is a low power node. Chances of occurance of Intercell interference is high when the user is at the edge of the cell. This book focus on the interference due to the Macro eNB to the cell edge user of Femto eNB . 3GPP LTE-A Enhanced Inter-Cell Interference Coordination (eICIC) scheme has proposed Almost Blank Sub-frame (ABS) as a solution towards the intercell interference. The eICIC is able to remove the interference towards the data signal of the corresponding sub-frames of the co-channel victim Femto eNB with the help of Almost Blank Sub-frame (ABS). However, even with the usages of ABS, interference from CRSs and other physical signals still appears. This book has discussed the methodology to reduce the interference due to the collision of reference signal and demonstrated Matlab simulation results.

Download or read book Resource Management for Heterogeneous Networks in LTE Systems written by Rose Qingyang Hu and published by Springer Science & Business Media. This book was released on 2014-03-21 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: This SpringerBrief provides an in-depth look at the key issues that affect the performance of heterogeneous networks and presents schemes that can effectively tackle these issues. In particular, this book discusses unbalanced traffic load among the macro and micro Base Stations (BSs) caused by the transmit power disparity, and a load-balancing based mobile association scheme to balance the traffic load among the macro and micro BSs. This book also introduces a fractional frequency reuse (FFR) scheme with proper power control to help reduce interference at the UEs which are most vulnerable to such intra-cell interference. The last section investigates radio resource allocation issues for heterogeneous networks with cooperative relays, and proposes a resource allocation framework that could achieve proportional fairness among the UEs. Numerical results are provided to demonstrate the effectiveness of the proposed solutions in tackling the problem and improving network performance. Resource Management for Heterogeneous Networks in LTE-A Systems is designed for researchers and professionals working in networking and resource management. The content is also valuable for advanced-level students in computer science and electrical engineering.

Download or read book Interference and Resource Management in Heterogeneous Wireless Networks written by Jiandong Li and published by Artech House. This book was released on 2017-11-30 with total page 213 pages. Available in PDF, EPUB and Kindle. Book excerpt: This authoritative resource offers a comprehensive overview of heterogeneous wireless networks, small cells, and device-to-device (D2D) communications. The book provides insight into network modeling and performance analysis of heterogeneous wireless networks. Interference management framework and design issues are covered as well as details about resource mobility, channel models, and typical and statistical interference modeling. This resource explains leveraging resource heterogeneity in interference mitigation and presents the challenges and feasible solutions for concurrent transmission. Moreover, complete coverage of interference alignment in MIMO heterogeneous networks for both downlink and uplink is presented. This book provides performance results for an ideal partially connected interference network as well as a practical heterogeneous network. Readers find practical guidance for LTE and LTE-Advanced as well as 5G in this resource. New techniques and designs for heterogeneous wireless networks are included.

Download or read book Downlink Interference Management and Resource Sharing in Heterogeneous Networks written by Haining Wang and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: To cope with the ever-increasing cellular traffic demand, the heterogeneous network is introduced to densify the cells for places where that is most needed. However, heterogeneous deployment with a mixture of base-stations of different capabilities also imposes great challenges for inter-cell interference management. In Long-Term Evolution (LTE) systems, for example, radio resources can be shared in time, frequency and spatial domain, providing us with the flexibility for interference avoidance or suppression. But finding a near-optimal solution in such a complex system can be extremely difficult, if not impossible, with reasonable computational complexity. In this dissertation, we tackle the interference management in heterogeneous cellular networks under different system constraints, application scenarios and/or with different kinds of quality-of-service (QoS) metrics. In this context, we investigate four major problems. In the first problem, we address the throughput optimization with shared resources of macro and femto cells. Since the femto base-stations can be operated in closed mode implying that only a specific group of users have access to its service, significant downlink interference can be incurred to a nearby macro user equipment (MUE) with poor resource management. We proposed a stochastic approximation based scheme by allowing feedback in the macro-tier to be overheard by the femto tier without explicitly estimating the cross-tier channel gains. In the second problem, we model the network as a queueing system with dynamically generated traffic. For less delay-sensitive traffic, we can control the power for each resource element to maximize the average throughput given the constraint that the backlog for the macro-cell queue is not unbounded. Using Lyapunov drift analysis, we provide both a centralized and a distributed solution for femtocell power control utilizing macrocell queue length information. In the third problem, we further incorporate fairness into our consideration. To achieve better fairness than that obtained by purely optimizing total throughput, we provide a joint power control and resource allocation scheme to minimize the maximal outage probability constrained on macrocell user equipments' outage requirements. This ensures better interference management by providing uniform user experience for all femtocell users. In the last topic, we treat different nodes as agents participating in a game either independently or in a coordinated way. In a pure non-cooperative game, each base station maximizes its own profit in the form of sum throughput towards all users associated with it. The spectrum efficiency can be much improved with careful design and signal passing across nodes. When each base station has private information, the optimization problem is essentially an auction game. When a centralized powerful entity exists as for the case of a cloud-based radio access network (C-RAN), radio resources can be managed in a semi-centralized way with each node bidding for the services. Using this model, we provide different schemes to achieve joint user association and resource management considering the trade-off between complexity and performance.

Download or read book Inter Cell Interference Control for Heterogeneous Wireless Networks in 3GPP LTE Advanced Systems written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Inter cell Interference Mitigation in LTE advanced Heterogeneous Mobile Networks written by A. B. A. Al-Aaloosi and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Radio resource management strategies for interference mitigation in 4G heterogeneous wireless networks written by Aikaterini Koutlia and published by . This book was released on 2016 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt: The new era of mobile communications is dictated by the user demand for robust and high speed connections, data hungry applications and seamless connectivity. Operators and researchers all over the world are challenged to fulfill these requirements by providing enhanced coverage, increased capacity and efficient usage of the scarce spectrum. The introduction of the fourth generation systems (4G), LTE and LTE-A, have set the initiative for a technology evolution that offers new possibilities and is able to satisfy the user requirements and overcome the imposed challenges. However, and despite the improvements brought by the LTE and LTE-A systems, there are certain constraints that still need to be surpassed. LTE for example adopts innovating technologies, such as Orthogonal Frequency Division Multiplexing Access (OFDMA) that improves the spectral efficiency and reduces the Intra-Cell Interference. Nevertheless, Inter-Cell Interference (ICI) remains a constraining factor that can degrade the system capacity and limit the overall performance of the network. On that respect, Inter-Cell Interference Coordination (ICIC) techniques are adopted with target the interference mitigation. One of the limitations of these techniques is that follow static configurations lacking of flexibility and adaptation on network changes. Moreover, LTE-A employs enhanced and new techniques and involves alternative strategies. A promising solution lies on the introduction of Heterogeneous Networks (HetNets), which are networks that include low power small cells under the already existing macro cellular network and exploit several other technologies, such as WiFi. HetNets can further improve the network capacity, enhance the coverage and provide higher speed data transfer. However, due to the heterogeneous nature of the network, traditional methods for the user association, resource allocation and interference mitigation may not always be suitable since their design was based on homogeneous deployments. As such, new and enhanced methods are introduced, such as enhanced ICIC (eICIC), with their accompanied requirements and challenges. Motivated by the abovementioned aspects, this thesis has been focused on the study of ICIC and eICIC schemes, the identification of the related challenges, the enhancement of existing schemes and the proposal of novel solutions. In particular in the initial stages of the work, ICIC techniques have been studied and analyzed. A distributed algorithm that performs dynamic channel allocation has been developed for homogeneous deployments and extended later on to include heterogeneous networks. The solution has been optimized with the use of the Gibbs Sampler, while the setting of algorithm related parameters has been addressed through a detailed analysis. Moreover, a possible implementation of the solution has been presented in detail. The efficiency of the proposed schemes has been demonstrated through simulations and comparisons with benchmark schemes. In the next steps, the work has targeted eICIC techniques with purpose the investigation and analysis of the main constraining issues related to the user association, resource management and interference mitigation. Novel eICIC schemes that aim a better resource management and the overall capacity improvement have been developed and presented in detail, while the performance of the solutions has been shown through simulations and comparisons with reference schemes. Moreover, an optimized eICIC solution has been implemented based on genetic algorithms. Simulation results and comparisons with reference schemes have demonstrated the efficiency of the solution, while the selected configurations are discussed and analyzed.

Download or read book Learning Based Techniques for Intercell Interference Coordination in LTE Advanced Heterogeneous Networks written by Meryem Simsek and published by . This book was released on 2013-09 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Architectures of Small Cell Networks and Interference Management written by Duy Trong Ngo and published by Springer. This book was released on 2014-07-08 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Springer Brief presents the architectures of small-cell networks and recent advances in interference management. The key challenges and values of small cells are first introduced, followed by the reviews of various small-cell architectures and interference management techniques in both heterogeneous CDMA and heterogeneous OFDMA small-cell networks. New adaptive power control and dynamic spectrum access techniques are discussed to promote a harmonized coexistence of diverse network entities in both 3G and 4G small-cell networks. Analytically devised from optimization and game theories, autonomous solutions are shown to effectively manage the intra-tier and cross-tier interferences in small cells. Informative and practical, this Springer Brief is designed for researchers and professionals working in networking and resource management. The content is also valuable for advanced-level students interested in network communications and power allocation.

Download or read book Interference Coordination for 5G Cellular Networks written by Lu Yang and published by Springer. This book was released on 2015-10-23 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt: This SpringerBrief presents interference coordination techniques for future 5G cellular networks. Starting with an overview of existing interference management techniques, it focuses on practical interference coordination schemes based on beamforming and user scheduling. The proposed schemes aim to deal with the inter-cell interference in multi-cell MIMO networks, cross-tier interference in device-to-device communications underlaying cellular network, and inter-network interference in cognitive radio networks. The performances of the proposed schemes are evaluated both analytically and numerically in terms of several performance parameters, including the sum rate, multiplexing gain, and outage probability of the networks. The results show that the proposed schemes can significantly reduce the effect of interference and improve the quality of service of the networks. Interference Coordination for 5G Cellular Networks is suitable for researchers and advanced students interested in interference coordination or 5G cellular networks.

Download or read book Small Cell Networks written by Holger Claussen and published by John Wiley & Sons. This book was released on 2017-11-06 with total page 582 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first and only up-to-date guide offering complete coverage of HetNets—written by top researchers and engineers in the field Small Cell Networks: Deployment, Management, and Optimization addresses key problems of the cellular network evolution towards HetNets. It focuses on the latest developments in heterogeneous and small cell networks, as well as their deployment, operation, and maintenance. It also covers the full spectrum of the topic, from academic, research, and business to the practice of HetNets in a coherent manner. Additionally, it provides complete and practical guidelines to vendors and operators interested in deploying small cells. The first comprehensive book written by well-known researchers and engineers from Nokia Bell Labs, Small Cell Networks begins with an introduction to the subject—offering chapters on capacity scaling and key requirements of future networks. It then moves on to sections on coverage and capacity optimization, and interference management. From there, the book covers mobility management, energy efficiency, and small cell deployment, ending with a section devoted to future trends and applications. The book also contains: The latest review of research outcomes on HetNets based on both theoretical analyses and network simulations Over 200 sources from 3GPP, the Small Cell Forum, journals and conference proceedings, and all prominent topics in HetNet An overview of indoor coverage techniques such as metrocells, picocells and femtocells, and their deployment and optimization Real case studies as well as innovative research results based on both simulation and measurements Detailed information on simulating heterogeneous networks as used in the examples throughout the book Given the importance of HetNets for future wireless communications, Small Cell Networks: Deployment, Management, and Optimization is sure to help decision makers as they consider the migration of services to HetNets. It will also appeal to anyone involved in information and communication technology.

Download or read book Heterogeneous Cellular Networks written by Rose Qingyang Hu and published by John Wiley & Sons. This book was released on 2013-04-03 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: A timely publication providing coverage of radio resourcemanagement, mobility management and standardization inheterogeneous cellular networks The topic of heterogeneous cellular networks has gained momentumin industry and the research community, attracting the attention ofstandardization bodies such as 3GPP LTE and IEEE 802.16j, whoseobjectives are looking into increasing the capacity and coverage ofthe cellular networks. This book focuses on recentprogresses, covering the related topics including scenariosof heterogeneous network deployment, interference management in theheterogeneous network deployment, carrier aggregation in aheterogeneous network, cognitive radio, cell selection/reselectionand load balancing, mobility and handover management, capacity andcoverage optimization for heterogeneous networks, trafficmanagement and congestion control. This book enables readers to better understand the technicaldetails and performance gains that are madepossible by this state-of-the-art technology. It contains theinformation necessary for researchers and engineers wishing tobuild and deploy highly efficient wireless networks themselves. Toenhance this practical understanding, the book is structured tosystematically lead the reader through a series of case-studies ofreal world scenarios. Key features: Presents this new paradigm in cellular network domain: aheterogeneous network containing network nodes with differentcharacteristics such as transmission power and RF coveragearea Provides a clear approach by containing tables, illustrations,industry case studies, tutorials and examples to cover the relatedtopics Includes new research results and state-of-the-arttechnological developments and implementation issues

Download or read book Interference Management in Heterogeneous Networks written by Min Sung Kim and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Cellular wireless data traffic is now growing at about 80% compound annual growth rate (CAGR), and hence creating a corresponding demand for additional capacity. This traffic growth in the developed world comes mainly from the increasing use of video file transfers or viewings. In the emerging countries, the increasing smart-phone penetration is an additional factor. The demand for capacity can be met by more spectrum, higher spectrum efficiency, and a greater number of cells. However, increasing spectrum and spectrum efficiency has proved to be slow because of both regulatory and technological barriers. Therefore, increasing the number of cells is an effective way to add capacity. Because of the diverse types of mobile data, the use of different tiers of cells has become necessary: high-power and high-capacity large macro cells to serve vehicle based users, medium-power and medium-capacity small pico cells for outdoor pedestrian users, and very low-power and low-capacity femto cells for indoor users. These cells often work together and are known as a heterogeneous network. The cells in a heterogeneous network often share the limited spectrum available to the operator. They reuse the spectrum across tiers as well as within the same tier. This inter-tier reuse creates interference, e.g., femto to macro interference. In addition, intra-tier interference arises from frequency reuse within a tier, e.g., femto to femto interference. Managing interference in heterogeneous networks is hence complex compared to the interference management of earlier single-tier macro cell networks, which is well understood. The research presented in this dissertation studied two interference management problems: inter-tier interference management between a macro cell and a femto cell, and intra-tier interference among femto cells. Chapter 2 presents the downlink femto-macro inter-tier interference management problem. This chapter proposes a cost criteria of maximizing the minimum (worst-case) rate of femto users while constraining the worst-case performance degradation of macro cell users caused by interference from the femto base station. Analysis shows that a combination of frequency (resource-block) allocation for femto users and power control of each resource block can lead to good results. Because the general joint resource block-allocation and power-control problem is very complex (NP-hard), a suboptimal method is developed using a decoupled resource allocation and power control. All these solutions were also verified by simulations. An analytical solution for the single femto user case also appears. Chapter 3 presents the management of downlink intra-tier interference in an enterprise femto network with multiple femto base stations. This chapter discusses admission of users to receive service, allocation of users to femto base stations, and the downlink power control to maximize the service rate while maintaining the QoS criteria, which specifies the worst-case 95th percentile download time of a file. The analysis demonstrates the effectiveness of the proposed algorithm by simulation and also discusses naive (baseline) scheduling, which does not manage intra-tier interference, that leads to poor throughput as the density of femto cells increase. Last, this chapter explores a flexible user-base station association approach wherein the base station associated with a given user can be dynamically changed during a download period at network events. Such flexibility adds a significant performance improvement. Chapter 4 concludes the thesis by summarizing the results, discussing the limitations of the work presented, and making suggestions for future research.

Download or read book Evaluation of Interference Cancellation Architectures for Heterogeneous Cellular Networks written by Skander Kacem and published by . This book was released on 2013-07 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: Diploma Thesis from the year 2012 in the subject Engineering - Communication Technology, grade: excellent, Technical University of Berlin (Intelligent Networks), language: English, abstract: With the increasing data throughput requirements, the cellular network needs to move from homogeneous to heterogeneous system. In fact, the coexistence of different types of base stations with different capabilities such as femto/pico base stations as well as relays and macro base stations in random placements should improve the coverage and the spectral efficiency of the cellular networks. However, the complexity of inter-cell interference management will grow drastically and traditional interference avoidance/mitigation approaches need to be revised. Approaching this problem at the user equipment (UE), is of great interest since it can rely on little coordination among base stations. The work presented in this thesis focuses on a downlink interference cancellation at the UE and shows that such an intelligent receiver can bring its promised benefit only if the base stations get involved in the interference cancellation, specifically in the channel estimation process. The limitations of this approach are evaluated and depending on the surrounding base stations two solutions are proposed and discussed.