Showing papers on "LTE Advanced published in 2008"

LTE-Advanced - Evolving LTE towards IMT-Advanced

Abstract: This paper provides a high-level overview of some technology components currently considered for the evolution of LTE including complete fulfillment of the IMT-advanced requirements. These technology components include extended spectrum flexibility, multi-antenna solutions, coordinated multipoint transmission/reception, and the use of advanced repeaters/relaying. A simple performance assessment is also included, indicating potential for significantly increased performance.

3G Evolution, Second Edition: HSPA and LTE for Mobile Broadband

Abstract: Reflecting the recent completion of LTEs specification, the new edition of this bestseller has been fully updated to provide a complete picture of the LTE system. The latest LTE standards are included on the radio interface architecture, the physical layer, access procedures, MBMS, together with three brand new chapters on LTE Transmission Procedures, Flexible Bandwidth in LTE and LTE evolution into IMT-Advanced. 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.The new edition has up-to-date coverage of the recently published LTE Release 8 radio-access standard, giving the reader insight into the ongoing and future process of LTE and LTE-Advanced standardisation. Coverage on LTE in this edition includes (an extra 160 pages): Easy-to-access overview of the LTE protocol layers Complete description of LTE physical layer including reference signals, control signalling, multi-antenna transmission schemes Covers both FDD and TDD, their fundamental difference and their impact on the LTE design Detailed description of access procedures including cell search, random access, broadcast of system information Transmission procedures, including retransmission protocols, scheduling, uplink power control Evolution towards IMT-Advanced ("4G") This book is a must-have resource for engineers and other professionals in the telecommunications industry, working with cellular or wireless broadband technologies, giving an understanding of how to utilize the new technology in order 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.* Includes details of the standards and technologies (160 new pages): LTE radio interface architecture, LTE physical layer and LTE access procedures* Contains three brand new chapters on LTE: Transmission Procedures, Flexible Bandwidth and LTE Evolution and expanded details on the physical layer (total LTE content is 270 pages)* Examines the latest developments in the evolution of LTE into IMT-Advanced, the next stage of 3G Evolution* Gives clear explanations of the role of OFDM and MIMO technologies in HSPA and LTE* Outlines the System Architecture Evolution (SAE) supporting LTE and HSPA evolution

Physical downlink control channel configuration for extended bandwidth systems

Abstract: The method includes forming a resource allocation for a particular system bandwidth, where the resource allocation has a larger number of resource blocks than a maximum number of resource blocks associated with the particular system bandwidth. The step of forming includes the use of an extended parameter in a derivation of the resource allocation. The method further includes transmitting information descriptive of the resource allocation to user equipment. The resource allocation may be a downlink resource allocation or an uplink resource allocation. The user equipment is enabled to employ a plurality of extended control channel elements as at least one of an extended physical downlink control channel and a physical hybrid automatic repeat request indicator channel. Modification of the PDCCH structure for LTE advanced in order to enable backward compatibility with Release 8 LTE and a greater choice of bandwidth. Carrier Aggregation concept.

On coverage and capacity of relaying in LTE-advanced in example deployments

Abstract: Relaying as a means of in-band backhaul has the potential to extend the coverage of Beyond 3G networks, enabling the expected high data rates of these networks to be delivered without increasing the density of traditional macro base stations. Assessing the performance of relaying is not simple, since traditional metrics fail and the performance depends strongly on the actual deployment. The current literature considers usually very artificial deployment environments and propagation models. This paper shows the coverage and achievable peak data rates for an urban area in central London using three-dimensional building data and a ray-tracing simulator. The number of relays per sector is determined for different scenarios, and compared to a Macro Deployment.

Mobility Management Survey for Home-eNB Based 3GPP LTE Systems

Abstract: The specification of the Home Evolved NodeB (Home-eNB), which is a small base station designed for use in residential or small business environment, is currently ongoing in 3GPP LTE (Long Term Evolution) systems. One of the key requirements for its feasibility in the LTE system is the mobility management in the deployment of the numerous Home-eNBs and other 3GPP network. In this paper, we overview the characteristic of Home-eNB and also describe the mobility management issues and the related approaches in 3GPP LTE based Home-eNB systems. Keywords : Home-eNB, 3GPP LTE (Long Term Evolution), Mobility Management 1. Introduction issues of HeNB in 3GPP LTE systems and related approaches A significant interest within the telecommunications industry has recently focused on the femto-cell which is defined broadly as low-cost, low-power cellular base stations that operate in licensed spectrum to connect conventional, unmodified mobile terminals to a mobile operator’s network [1][2][3]. Femto-cell has been actively discussed in 3

Online charging architecture in lte/epc communication networks

Abstract: Communication networks and methods are disclosed for performing online charging in LTE/EPC communication networks. In an LTE/EPC communication network, one or more LTE network elements connect to an Online Charging System (OCS) over an enhanced interface. The LTE network element that is serving a session for a mobile device triggers on a charging event, and generates a credit request message (e.g., Diameter CCR). The LTE network element identifies access information for the session indicating the type of access for the mobile device to the LTE/EPC communication network, and inserts the access information in the credit request message. Through the enhanced interface, the LTE network element is able to transmit the credit request message to the OCS with the access information. The access information may then be used in the OCS to determine a more accurate charging rate for the session.

Method and apparatus for supporting handoff from gprs/geran to lte eutran

Abstract: A method and apparatus for supporting a handoff (HO) from a general packet radio service (GPRS), global system for mobile communication radio access network (GERAN), and long term evolution (LTE) evolved universal terrestrial radio access network (EUTRAN) includes receiving an LTE measurement report. An HO is initiated to the LTE network and a relocation request signal is transmitted. A relocation command signal that includes an evolved Node-B (eNB) identifier (ID) is received.

MIMO Schemes in UTRA LTE, A Comparison

Abstract: The long term evolution of UMTS (Universal Mobile Telecommunications System) Terrestrial Radio Access, abbreviated as UTRA LTE, will be based on OFDM (orthogonal frequency division multiplexing). Furthermore, MIMO (multiple-input multiple-output) techniques have been considered as a means for the improvement of wireless connectivity. In wireless systems, high data rates in the downlink are desirable: Furthermore, with respect to an efficient implementation, the downlink requires a thorough assessment. In particular, the Alamouti and the V-BLAST (Vertical Bell Labs Layered Space Time) schemes are seen as interesting concepts. In this communication, the authors will compare these two MIMO schemes w.r.t. the achievable performance in the UTRA LTE downlink using up to two transmit and two receive antennas. Furthermore, the authors will discuss the deployment of spatial multiplexing in the UTRA LTE downlink and will show that the performance of successive interference cancellation (SIC) based data detection techniques for MIMO-OFDM is beneficial.

Wireless backhaul for LTE - requirements, challenges and options

Abstract: Next generation broadband wireless technologies such as 3GPP long term evolution (LTE) and WiMax offer significantly higher data rates and require suitably higher capacity backhaul networks. While some service providers have started rolling out WiMax, 3GPP LTE is expected to be standardized during 2009, and many service providers are planning to offer LTE services by 2010-2012. Apart from significantly higher speeds, LTE Base stations (eNBs) require logical full mesh connectivity due to the flat all-IP architecture. This paper explores the wireless backhaul network infrastructure options for addressing the LTE bandwidth and connectivity challenges. The paper details the backhaul requirements for 3GPP LTE as specified in the LTE specifications. The paper analyses different architectures for the backhaul access and aggregation networks. The paper proposes a logical topology model for the aggregation network, examines its realization via carrier Ethernet transport and IP/MPLS, and identifies technology gaps in realizing the logical topology model. The paper concludes that while MPLS satisfies the requirements better today, given the time available for LTE evolution, native carrier Ethernet transport could emerge as a strong candidate for future deployments.

Standardization of 3GPP LTE and LTE-Advanced

Abstract: 3GPP는 WCDMA의 3세대 이동통신 표준화 이후 HSDPA, MBMS, HSUPA 등의 기술을 지속적으로 추가하여 3세대 이동통신 시스템을 개량해 왔다. 또한 2005년부터는 OFDMA/SC-FDMA 전송방식을 기반으로 하는 LTE 표준화를 진행해 왔다. 현재는 ITU-R의 IMT-Advanced 표준을 위해 LTE를 개선한 LTE-Advanced를 준비하고 있다. LTE-Advanced는 IMT-Advanced 표준의 유력한 후보 중 하나로 사업자들의 폭넓은 지지를 받고 있다. 이에 본 고에서는 3GPP에서 추진하고 있는 LTE 표준 기술과 LTE-Advanced 표준화 동향을 살펴보고자 한다.

Implementation of an efficient UE decoder for 3G LTE system

Abstract: In order to migrate toward 4G, studies on 3G LTE (Long Term Evolution) have been announced recently in the 3GPP(3rd Generation Partnership Project) and standardization is under way. Therefore, 3G LTE (Long Term Evolution) systems have been designed and developed over many countries. We also have been developing a 3G LTE testbed system at ETRI. 3G LTE system is adopting OFDM (Orthogonal Frequency Division Multiplexing) method, especially 2times2 MIMO (Multiple Input Multiple Output) OFDM and convolutional and turbo encoder for control channels and data channels respectively. In this paper, we describe the structure and implementation method of control channels and data channels of the UE decoder which is being developed at ETRI and propose an efficient implementation method to minimize clock cycle to complete the derate matching algorithm of shared channel data.

Long term evolution of 3GPP and its physical layer technologies

Abstract: The long term evolution(LTE) program of 3GPP is the biggest research program launched in recent years.It has achieved many great progresses since it has been initiated in 2004.3GPP LTE has fulfilled the high data rate,low latency and all-packet basis.This paper introduced its design objectives for E3G system service capabilities and the advanced technologies and novel concepts related to the physical layer in LTE program.

Standardization of MIMO-OFDM Technology

Abstract: Standards development organizations around the world are making rapid advances in adopting MIMO-OFDM as the technology of choice for emerging broadband wireless standards. These include IEEE 802.11n - the next generation standard for wireless local networking, IEEE 802.16e - a new standard for metropolitan area networks, and 3 GPP Long Term Evolution (LTE) - the next generation standard for cellular networking. When multiple antennas are deployed at the transmitter, they can be used to increase data rates and/or enhance link robustness. Data rates can be increased by using space division multiplexing, which requires standardization. Link robustness can also be enhanced through transmit beamforming, which requires channel state information at the transmitter. FDD systems generally require standardization, but TDD systems also benefit from standardization. Transmit diversity techniques also enhance link robustness. However, some transmit diversity techniques require standardization (such as space time block coding), whereas some do not (such as delay diversity). In this tutorial, we will discuss the various flavors of MIMO-OFDM that are being standardized in 802.11n, 802.16e, and LTE. We will describe in detail the similarities and differences of these systems. For example, 802.11n is a TDD based system and only supports one user in the channel at any given time. LTE, on the other hand, is primarily an FDD based system, and aims to support multiple users in the channel at any given time. Hence, the concept of centralized control with multi-user MIMO is being developed within LTE and 802.16e, whereas 802.11n with decentralized control only supports single-user MIMO. However, space division multiplexing is similar across 802.11n, 802.16e, and LTE.

Software implementation and performance analysis of the LTE physical layer blocks on a next generation baseband processor platform

Abstract: Summary form only given. The Third Generation Partnership Project (3GPP) has been defining the Long Term Evolution (LTE) for 3G radio access. LTE has several areas of focus. These areas include enhancement of the Universal Terrestrial Radio Access (UTRA), as well as optimization of the network architecture with HSDPA (downlink) and HSUPA (uplink). LTE project aims to ensure the continued competitiveness of the 3GPP technologies for the future LTE focuses on download rates of 100 Mbit/s, upload rates of 50 Mbit/s per 20 MHz of bandwidth, increased spectrum efficiency and sub-5ms latency for small IP packets. This paper provides an overview of the radio interface physical layer requirements. The paper then presents the implementation of the current LTE standards on a second generation flexible baseband processor. The implementation will be be limited to the receiver chain blocks and will be entirely in ANSI C, written for a fixed point digital signal processors. The underlying assumption of this implementation is to avoid any hardware accelerators that would make the hardware platform for the baseband processing standard specific. The SB3500 is the second generation of SandBlaster-based low power, high performance system on a chip (SoC) products developed to serve the software defined radio (SDR) modem applications space. It is a multi-core device, containing 3 dasiaSBXpsila DSP cores. The software implementation of LTE physical layer includes implantation of OFDM and receiver chain processing in ANSI C. The projected processing requirements of an LTE UE on the SB3500 are presented with the expected number of cores needed for the data rates analyzed. The down-sampling filter used for the initial synchronization and for the fine synchronization, FFT block, Channel estimation for each reference symbol, MIMO detector and the CRC block are included in this analysis. The specific architectural features of the SB3500 and the compiler optimizations to yield a real time software implementation of LTE are also presented.

UMTS LTE; Network, Services, Technologies, and Operation

Abstract: This book explains the basic components, technologies used, and operation of UMTS LTE systems. You will discover why mobile telephone service providers are upgrading their 2nd and 3nd generation digital mobile to a more efficient and feature rich UMTS LTE generation system. Discover the key features that UMTS LTE systems provide that go beyond the capabilities of existing 2G and 3G mobile systems such as ultra high-speed Internet (100 Mbps+), television (multicast video), and low latency services (packet voice).Explained are the physical and logical radio channel structures of the UMTS LTE systems along with the basic frame and slot structures. Described are the fundamental capabilities and operation of the UMTS LTE radio channel including channel coding, modulation types, low-latency transmission and how transmission reliability is improved using MIMO technology.You will discover the key functional sections of UMTS LTE networks and how they communicate with each other. Learn how and why UMTS LTE systems separate control channels from user data channels. Learn how UMTS LTE systems can co-exist and interoperate with existing mobile systems and simplify the migration plan from less efficient mobile systems to more cost effective and capable UMTS LTE systems.Learn how spatial division multiple access (SDMA) can be used by UMTS LTE systems to provide dramatic increases in system capacity. The evolution of 3G systems into UMTS LTE systems explained. Some of the most important topics featured in this book are: How UMTS LTE systems operate UMTS LTE voice, data, and multimedia services The types of UMTS LTE products and their uses The UMTS LTE radio channel structure The different types of physical and logical channels UMTS LTE network components and interfaces Evolved multimedia broadcast multicast services (E-MBMS) Location bases services (LBS) IP multimedia subsystem (IMS) How UMTS LTE technology is evolving into 4G systems

Long-Term Evolution (LTE) of Mobile Radio Communications

Abstract: LTE (long-term evolution) is an evolution of GSM (global system for mobile communications) and UMTS (universal mobile telecommunications system). LTE introduces a new radio access network that implements technologies, which provide higher data rates, improvements in efficiency and quality of service, lower costs, and integration with existing open standards. The LTE radio access network is connected with a core network known as SAE (system architecture evolution) that implements flat network architecture and is exclusively packet switched. Peak data rates of 100 Mb/sec on the downlink and 50 Mb/sec on the uplink within a 20 MHz spectrum allocation. Control plane capable of carrying signalization for 200 simultaneously active users for spectrum allocations up to 5 MHz and for at least 400 users for higher spectrum allocations. Switch time between idle and active state shorter than 100 msec. Radio access network latency below 10 msec. Spectral efficiency 5 bit/sec/Hz on the downlink and 2.5 bit/sec/Hz on the uplink. Radio access network optimized for mobile user speeds up to 15 km/hr. The system should support high performance for speeds up to 120 km/hr. Links should be maintained at speeds up to 350 km/hr or up to 500 km/hr depending on the frequency band. The system should support the targeted performance within a 5-km range. A slight degradation in performance is tolerated within a 30-km range. Ranges up to 100 km or even more should not be precluded by the specifications. Enhanced broadcast and multicast transmissions compared to HSPA standards. Scalable bandwidth allocation of 1.25 MHz, 1.6 MHz, 2.5 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz. Bandwidths narrower than 5 MHz enable a smooth transition to the spectrum of the previous generations of mobile systems. Deployment in frequency bands of the previous generations of mobile systems: 450 MHz, 700 MHz, 800 MHz, 900 MHz, 1600 MHz, 1700 MHz, 1900 MHz, 2100 MHz, and others. Because a large set of frequency bands is available, global roaming will be possible. Support for paired and unpaired spectrum for FDD (frequency division duplex), TDD (time division duplex) and the combination of both. The advantage of combined •