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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15 May 2011
TL;DR: A complete design and hardware implementation for the detection of the SSS is presented and the fixed point representation of the proposed system design is optimized to use the smallest word lengths at various system nodes while maintaining the overall performance within acceptable limits.
Abstract: Cell search has to be performed by the user equipment in 3GPP Long Term Evolution (LTE) systems to obtain cell identity before connecting to the cell. The cell identity is transmitted using the Primary Synchronization Symbol (PSS) and the Secondary Synchronization Symbol (SSS). The PSS carries one of three possible values for the sector identity whereas the SSS carries one of 168 possible values for the physical cell identity. Straightforward implementation of SSS detection incurs a large area due to the large number of required correlators. This paper presents a complete design and hardware implementation for the detection of the SSS. The fixed point representation of the proposed system design is optimized to use the smallest word lengths at various system nodes while maintaining the overall performance within acceptable limits. Different architectures are studied, compared and an all-serial architecture is chosen to minimize the design area and power consumption, while achieving an acceptable acquisition time.
14 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...In [6] and [7], the same structure is considered but without studying the hardware implementation of the detection algorithm....
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01 Oct 2011
TL;DR: This paper proposes delay-aware packet scheduling (DAPS) algorithm considering QoS requirements of delays for various traffic classes, channel conditions, and fairness, and shows that DAPS algorithm yields better delay performance compared with two existing PF and M-LWDF algorithms.
Abstract: In wireless mobile environments, large bandwidth and high quality of service (QoS) are recently required to support the increased demand for multimedia services. Long term evolution (LTE) is one of the promising solutions for the next generation broadband wireless access systems. In order to support high data rate with low latency, LTE simplifies network architecture and uses orthogonal frequency division multiple access (OFDMA) for downlink transmission technology. Packet scheduling algorithm is one of the important features to support QoS in LTE system. In this paper, we propose delay-aware packet scheduling (DAPS) algorithm considering QoS requirements of delays for various traffic classes, channel conditions, and fairness. To reflect delay experience at scheduling instance, DAPS algorithm observes how queue waiting time of head-of-line (HOL) packet is closed to allowed maximum packet delay. As a result, DAPS increases the number of transmitted packets with satisfying the required delay. Comprehensive simulation results show that DAPS algorithm yields better delay performance compared with two existing PF and M-LWDF algorithms.
14 citations
Cites background or methods from "3G Evolution : HSPA and LTE for Mob..."
...Therefore, in LTE system, peak data rate for each user on downlink and uplink could be supported up to 100 Mbps and 50 Mbps, respectively, in case of operating in 20 MHz transmission bandwidth [1], [2]....
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...NB conducts the transmission and reception of data to and from user equipments (UEs) in a cell or multiple cells and RNC connects several RANs with core network....
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...I. INTRODUCTION 3rd generation partnership project (3GPP) has standardized of long term evolution (LTE) to enhance capabilities of the universal mobile telecommunications system (UMTS) [1]....
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...WCDMA/HSPA RAN consists of several logical nodes, called NodeB (NB), and radio network controller (RNC)....
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...On the other hand, LTE RAN has only one node, called eNodeB (eNB), which has the same functionality as NB and it also has most functionality of WCDMA/HSPA RNC [1]....
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01 Jan 2014
TL;DR: This dissertation addresses network reconfiguration and dependability by cognitive measures from multiple perspectives – each covered by a respective part of this work – providing guidelines for cognitive networks design.
Abstract: Radio communication is used in increasingly diversified device typologies. Telecommunications with a reduced detrimental impact on health and environment, and an improved cost-efficiency and working lifetime are expected by institutions, end-users, operators and manufacturers. Moreover, with more networks present or more articulated systems, dependability of the entirety is to be ensured. The related need of efficiency in various compartments – such as in the use energy or the radio spectrum – and of effectiveness in adapting to changing operating conditions can be achieved with cognitive features. This dissertation addresses network reconfiguration and dependability by cognitive measures from multiple perspectives – each covered by a respective part of this work – providing guidelines for cognitive networks design. A rationalising view on cognitive networks with related taxonomies and models includes a discussion on the dynamics and interactions in networks operating closely and simultaneously (here, concurrent networks). While cognitive domains are specified for cognitive functions, with a more generic scope control functions are assigned to topological domains. This allows a flexible exploitation of the system design by decoupling the specification of system functions from their mapping onto network devices that will host them. As interaction plays an important role in many topical scenarios, a model for networked engineered cognitive entities comprising four categories (observation, interworking, consolidation, operation) and two levels (a cognitive frontier and a metacognitive hub) is presented here. Its cognitive phases are considered with regard to the other architectural elements. Moving the focus down to the levers for exploitation of context awareness, are presented solutions for efficient use of resources and dependability in general, considering the network dynamics. For communication link and network adaptation, the effective capacity is captured by a compact-form expression also considering imperfections, while learning is exploited for reducing overhead, and collaboration for fairly maximising energy save.
14 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...From the well-known Shannon capacity limit, the required information-bit-energy to noise-power-density can be obtained as (Dahlman et al. 2008):...
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03 Apr 2016
TL;DR: A numerical analysis confirms the validity of the design in generating ZT DFT-s-OFDM reference sequences with zero autocorrelation, limited cross-correlation, flat frequency response and low Peak-to-Average Power Ratio (PAPR).
Abstract: Zero-tail Discrete Fourier Transform-spread OFDM (ZT DFT-s-OFDM) modulation replaces the Cyclic Prefix (CP) with a low power tail whose length can be dynamically configured to cope with the instantaneous delay spread of the channel. In this paper, we discuss the reference sequence design for ZT DFT-s-OFDM. Our proposed approach is based on a deliberate distortion of the known Zadoff-Chu (ZC) sequences aiming at adapting them to the ZT DFT-s-OFDM waveform while preserving their attractive properties. A numerical analysis confirms the validity of our design in generating ZT DFT-s-OFDM reference sequences with zero autocorrelation, limited cross-correlation, flat frequency response and low Peak-to-Average Power Ratio (PAPR).
14 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...In case the length L of the ZC sequence is a prime number, the set of sequences fullfilling the mentioned properties has cardinality equal to L−1....
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TL;DR: A new data flow controller for use in 4G and 5G wireless applications where the incoming internet data flow is split in support of multipoint downlink wireless transmission to keep the delay skew within a prespecified interval of time, when the packets arrive in the mobile.
Abstract: The paper presents a new data flow controller for use in 4G and 5G wireless applications where the incoming internet data flow is split in support of multipoint downlink wireless transmission. The different paths of the data from the node of the split to the wireless transmission nodes and on to the mobile may then result in different travel times. The mobile can cope with small values of this delay skew by means of buffers and reordering protocols. The control objective is therefore to keep the delay skew within a prespecified interval of time, when the packets arrive in the mobile. The proposed algorithm solves the problem by cascade control. The packet dwell time of each wireless transmission node data queue is controlled by an inner loop, with the reference dwell times being determined by an outer delay skew control loop. The delay skew control loop exploits a deadzone to achieve interval control. In a further contribution the $\mathcal{L}_2$ -stability of the controller is analyzed for the dual connectivity functionality of the coming 5G cellular network deployment. A combined use of the input–output Nyquist- and Popov-criteria is required for the analysis. The performance is also evaluated by a laboratory testbed implementation.
14 citations
Cites background or methods from "3G Evolution : HSPA and LTE for Mob..."
...Other reasons for multi-point access include capacity enhancements using coordinated wireless transmission schemes, [3]....
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...This is believed to give a good prediction also of the 5G performance since the delays and sampling period are selected to be close to 1 ms, and since the radio access methods of 4G and 5G both use orthogonal frequency division multiple access (OFDMA) [3]....
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...DC was introduced in release-12 of the long term evolution (LTE) fourth generation (4G) cellular system [3], [23], and it aggregates connectivity from multiple transmission resources that may belong to different radio access technologies like 4G LTE and future 5G wireless access....
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