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
Citations
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TL;DR: This article proposes a simple, yet efficient, strategy to enable power domain non‐orthogonal multiple access (PD‐NOMA) aided grant‐free communication, where devices can transmit their data in an arrive‐and‐go manner by using randomly chosen power levels.
Abstract: Grant‐free access has been identified as a potential solution to support massive machine‐type communications by avoiding the high signaling overhead and latency issues of existing grant‐based channel access mechanisms. Motivated by this, the work in this article proposes a simple, yet efficient, strategy to enable power domain non‐orthogonal multiple access (PD‐NOMA) aided grant‐free communication, where devices can transmit their data in an arrive‐and‐go manner by using randomly chosen power levels. The focus here is on collision detection, which is of prime importance in grant‐free systems. In the considered grant‐free PD‐NOMA scheme, collisions occur when multiple users randomly choose the same resource block and power level for data transmission, which makes it difficult for the base station (BS) to distinguish between their data. Accordingly, the proposed technique aims at early collision detection by introducing special activity indicator symbols (AIS), which are transmitted by each active device before, or at the start of, the actual data packet. The BS then exploits these known AIS to identify successful transmissions and collisions before processing actual data, which avoids unnecessary data transmission by users and/or receiver processing in case of collisions, and prepares the receiver for appropriate data recovery otherwise. It is demonstrated that the proposed technique provides a low complexity and high performance solution to enable transmission status detection in grant‐free PD‐NOMA.
3 citations
08 Apr 2011
TL;DR: Analysis of the two proposed algorithms namely Max Rate (MR) and Round Robin (RR) at different value of SNR shows that maximum throughput is achieved by MR and fairness by RR.
Abstract: Long Term Evolution (LTE) represents an emerging and promising technology for providing a high throughput. In this paper we are analyzing the two proposed algorithms namely Max Rate (MR) and Round Robin (RR) at different value of SNR. Result shows that maximum throughput is achieved by MR and fairness by RR.
2 citations
Patent•
04 Nov 2016TL;DR: In this paper, the authors proposed a method for processing a constant amplitude sequence that yields a transmission signal exhibiting a low PAPR by adding to the sequence one or more complexvalued elements that have the same amplitude as other complex-valued elements in the sequence.
Abstract: An apparatus and method for processing a constant amplitude sequence yields a transmission signal exhibiting a low PAPR. The method comprises extending a constant amplitude sequence, such as a Zadoff-Chu sequence, by adding to the sequence one or more complex-valued elements that have the same amplitude as other complex-valued elements in the sequence. The method also includes upsampling the extended sequence by linearly interpolating a difference in phase between adjacent complex-valued elements in the extended sequence. The method further entails limiting a bandwidth of the upsampled sequence by low pass filtering the upsampled sequence. The method may also include transmitting the band limited sequence. Due to the low PAPR of the transmitted signal, a power amplifier, which may be integrated with other circuits in a System-on-Chip, may have a low backoff. This yields high efficiency for the amplifier, hence low power consumption, and extended battery life in radio network devices.
2 citations
05 Feb 2010
TL;DR: In this article, the authors investigated the effect of different optimization criteria for dynamic subcarrier allocation in a single carrier - frequency division multiple access (SC-FDMA) system simulation results show that using the minimum bit error rate (BER) as the optimization criterion has the best BER performance and an almost optimal capacity performance.
Abstract: This paper investigates the effect of using different optimization criteria for dynamic subcarrier allocation in a single carrier - frequency division multiple access (SC-FDMA) system Simulation results show that using the minimum bit error rate (BER) as the optimization criterion has the best BER performance and an almost optimal capacity performance The other criteria referred to as maximum spectral efficiency (SE), maximum channel gains and maximum output signal-to-interference-to-noise ratio (SINR), do not attain the same performance trade-off as the minimum BER In addition, the simulation results show that the optimization criteria, is just as important as the dynamic subcarrier allocation algorithm in determining the overall performance of the system
2 citations
Journal Article•
TL;DR: The simulation result shows that the throughput of TCP NewReno is a bit better than TCP Vegas, whereas TCP Vegas shows significantly better end-to-end delay and packet loss.
Abstract: Long Term Evolution (LTE) is a mobile broadband technology that can provide the implementation of wireless networks. It offers a variety of advantages such as better access speed, bandwidth capacity, architectural simplicity and ease of implementation, as well as breadth of type of user equipment (UE) that can access the LTE. The majority of Internet connections in the world are implemented using one of the transport protocols, i.e. TCP (Transmission Control Protocol) due to its reliability in transmitting packets in the network. TCP reliability lies on the ability to control congestion in the network. Formerly, TCP was originally designed for wired media which is more stable compared to wireless medium like LTE. Currently, there are many variants of TCP designed for better performance depending on its usage and network scenarios. In this paper, the performance evaluation is conducted to compare the performance of TCP NewReno and TCP Vegas based on simulation using NS-2. The TCP performance is analyzed in terms of throughput, RTT, packet loss and end-to-end delay. In comparing the performance of TCP NewReno and TCP Vegas, the simulation result shows that the throughput of TCP NewReno is a bit better than TCP Vegas, whereas TCP Vegas shows significantly better end-to-end delay and packet loss.
2 citations
Additional excerpts
...Built by the 3GPP family which had previously been successful in establishing GSM technology, GPRS, EDGE, and WCDMA and HSDPA now and then HSPA +, LTE offers a smooth evolution towards more speed high with low latency [4]....
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