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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24 Nov 2014
TL;DR: A novel transport protocol - queue-length-aware TCP (TCP-QLA), that tackles the problem of bufferbloat to provide better QoS for applications requiring low end-to-end delay and/or high bandwidth utilization.
Abstract: Knowledge of the queue length of the bottleneck link has many potential applications such as congestion control, traffic engineering, traffic policing, content adaptation, QoS monitoring and provisioning, etc. A recent work proposed a new Sum-of-Delay with Timestamp (SoD-TS) algorithm which can accurately estimate queue length in mobile networks with both bandwidth variations and uplink delay variations by exploiting the existing TCP Timestamp option. By making use of SoD-TS we developed a novel transport protocol - queue-length-aware TCP (TCP-QLA), that tackles the problem of bufferbloat to provide better QoS for applications requiring low end-to-end delay and/or high bandwidth utilization. Trace-driven simulation shows that compared to TCP CUBIC TCP QLA can reduce the RTT by a factor of 2.7 while still achieving over 97% bandwidth utilization. Moreover, TCP-QLA further reduces RTT by 50% compared to delay-based TCP such as FAST TCP and TCP Vegas.
4 citations
Cites background or methods from "3G Evolution : HSPA and LTE for Mob..."
...Naturally this will affect the estimation accuracies of Vegas and SoD methods....
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...With the emergence of mobile data networks such as 3G/4G [6], the challenge of changing network conditions is even more critical for application designers, content providers as well as mobile operators....
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TL;DR: This work argues that a non-parametric approach to rate prediction is necessary, and proposes two distinct rate-prediction algorithms that simultaneously estimate the best Markov model for each UE and then perform prediction based on the estimated model.
Abstract: In cellular broadband access systems, such as 3GPP long-term evolution, the user equipment (UE) feeds back a quantized rate metric to the base station (eNodeB), in order to perform rate adaptation. The periodicity of this rate feedback is fixed so as to minimize the overhead without eroding its benefits. However, between two feedback instants $n$ and $n+\delta $ , the actual rate that the UE can correctly decode might change due to the: 1) Doppler shift and 2) change in the active set of interferers. Hence, to fully exploit the benefits of adaptation, an accurate prediction of the attainable rate is required. In this context, we argue that a non-parametric approach to rate prediction is necessary. Since the selected rate is from a set of discrete values, the rate prediction problem is mapped by us onto a discrete sequence prediction problem, and we construct higher order Markov models for the discrete sequences using source encoding algorithms. We then propose two distinct rate-prediction algorithms. One of them is the adaptive maximum $a~posteriori$ estimator, while the other is the adaptive Bayesian risk-based estimator. Both of these algorithms simultaneously estimate the best Markov model for each UE and then perform prediction based on the estimated model.
4 citations
Cites background or methods from "3G Evolution : HSPA and LTE for Mob..."
...For certain receiver categories, where the receiver cannot receive high data rates, a high CQI value is used for achieving transmission power reduction at the base-station [8]....
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...1 Mbps and uses QPSK, 16-QAM and 64-QAM modulation schemes [6], [8]....
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...The CQI levels in HSDPA indicate not only the modulation and coding rate to be used but also the transport block size (code block size) [8]....
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30 Sep 2008
TL;DR: The traffic separation technique enables QoS differentiations of HSPA and R99 traffic, while at the same time aims to achieve a maximum utilization of the transport resources in the radio access network.
Abstract: This paper presents a general traffic separation approach to transmit HSPA traffic in the existing ATM-based UMTS network, together with Release 99 (R99) traffic. The traffic separation technique enables QoS differentiations of HSPA and R99 traffic, while at the same time aims to achieve a maximum utilization of the transport resources in the radio access network. The potential benefit of applying traffic separation and its impact on the performance of the transport network as well as the end users are explored in this paper. The quantitative evaluations are provided by means of simulations. The results presented are obtained from a UMTS simulation model developed in this work which transmits both HSPA and R99 traffic, either with traffic separation enabled or disabled.
4 citations
19 Apr 2010
TL;DR: The results show that even when an operator provisions network capacity below the peak load, cooperation with other network providers can help maintain quality of service for most sessions and confirm that WiFi 802.11b/g consistently delivers superior performance compared to 3G.
Abstract: Today's mobile networks prevent users from freely accessing all available networks. Instead, seamless network composition could present a win-win situation for both users and operators. Users can gain better quality of service with more resources to choose from, while each individual operator can provision lesser bandwidth since resources can be shared during times of peak demand. In this paper, we analyze the benefits of operator cooperation using real trace data of cellular data access. We leverage the difference in burstiness at small timescales across network providers to shed the peak usage of one operator on to another. Our results show that even when an operator provisions network capacity below the peak load, cooperation with other network providers can help maintain quality of service for most sessions. In addition, we investigate the performance delivered by various kinds of cellular data cards. Our results confirm that WiFi 802.11b/g consistently delivers superior performance compared to 3G. It will take the next generation 4G technologies such as LTE to deliver end-user performance comparable to widely-deployed 802.11 networks.
4 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...3) Long-Term Evolution (LTE): LTE [17] is a new radio access standard developed by 3GPP aiming towards mobile broadband 4G....
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23 Aug 2012
TL;DR: An effective packet scheduling algorithm based on proportional fairness (PF) scheduling algorithms for LTE is presented and the performance of optimized scheduling algorithm is evaluated through simulation of multimedia traffics being currently transmitted to users the over LTE links in a multi-cell environment.
Abstract: The Long Term Evolution (LTE) system is already able to provide a various background of media to mobile users, including multimedia services such as audio, video, data. In fact, the High Speed Downlink Access plus (HSPA+) solution within LTE can greatly enhance bit rates on downlinks. However, the supporting for multimedia applications with different QoS requirements is not devised yet. Hence, in this paper we present an effective packet scheduling algorithm based on proportional fairness (PF) scheduling algorithms for LTE. We optimize traffic class weightings and instantaneous user data rates that are central to packet prioritization approach of packet scheduling. Finally, we evaluated and showed the performance of optimized scheduling algorithm through simulation of multimedia traffics being currently transmitted to users the over LTE links in a multi-cell environment.
4 citations
Cites background from "3G Evolution : HSPA and LTE for Mob..."
...© Springer-Verlag Berlin Heidelberg 2012 Keywords: LTE, packet scheduling, PF, multimedia traffic....
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...LTE [1] is a new radio access technology proposed by the 3GPP(Third Generation Partnership Project) to provide a smooth migration towards fourth generation (4G) wireless systems....
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...Hence in this paper, we focus on optimization a packet scheduling algorithm for multimedia traffic over the LTE link based on PF scheduling algorithm....
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...In this paper, we have introduced our proposed WDLM-PF packet scheduling algorithm for downlink LTE system based on proportional fairness....
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...The ability to support high data rates of LTE system enables application developers to create rich contents such as “multimedia” applications, typically consisting of a number of classes of media or data with different QoS requirements (i.e. delay constraint and rate constraint) which are downloaded to a single user....
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