The Road to IMT-Advanced Communication Systems: State-of-the-Art and Innovation Areas Addressed by the WINNER plus Project

Ericsson AB, Stockholm
IEEE Communications Magazine (Impact Factor: 4.01). 07/2009; 47(6):38 - 47. DOI: 10.1109/MCOM.2009.5116799
Source: IEEE Xplore


Phases I and II of the WINNER project contributed to the development, integration, and assessment of new mobile network techniques from 2004 to 2007. Some of these techniques are now in the 3GPP LTE and IEEE 802.16 (WiMAX) standards, while others are under consideration for LTE-Advanced and 802.16m. The WINNER+ project continues this forwardlooking work for IMT-advanced technologies and their evolution, with a particular focus on 3GPP LTE-advanced. This article provides an overview of the WINNER system concept and several of its key innovative components.

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    • "Moreover, relaying was investigated during the Wireless World Initiative New Radio (WINNER) project which was a major European Unionfunded initiative. The WINNER project contributed to the development and assessment of new mobile network techniques which are already in 3GPP LTE and IEEE 802.16 (WiMAX) standards or under consideration for 3GPP LTE- Advanced and IEEE 802.16m [9]. In addition, very recently in January 2010 another major European Union-funded project, namely Advanced Radio Interface Technologies for 4G Systems (ARTIST4G) has been initiated to improve the allover user experience of cellular mobile radio communications via innovative concepts such as new relay concepts [10]. "
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    ABSTRACT: Relaying is a promising enhancement to current radio technologies, which has been considered in IMT-Advanced candidate technologies such as 3GPP LTE-Advanced and IEEE 802.16m. Relay enhanced networks are expected to fulfill the demanding coverage and capacity requirements in a cost efficient way. Among various relaying architectures multi-hop moving relays can provide additional capacity for the cases when fixed relays are inaccessible or not able to provide adequate solutions in terms of cost. In this paper, an overview of multi-hop moving relays along with some of the envisioned deployment scenarios is presented. Furthermore, different types of multi-hop moving relays are discussed and the challenges are addressed.
    Preview · Article · Jan 2012
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    • "The BSs are interconnected and directly linked to a gateway managing connections to other IP-based networks. This so-called flat architecture simplifies the user data flow and enables flexible and cost-effective capacity scaling [12], [13]. Previously, the High Speed Packet Access (HSPA) architecture (Release 7) has already made simplifications in the core network, reducing the number of functional elements from four in Release 6 to two in Release 7 [14]. "
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    ABSTRACT: The Ultra Flat Architecture is a new concept of fixed mobile convergent networks that aims to scale well with the mobile internet traffic explosion prognosticated for the next 5–10 years. This paper investigates the adequacy of three different sig-naling protocol alternatives for the Ultra Flat Architecture based on operator requirements. The applied evaluation method is the Multiplicative Analytic Hierarchy Process. After the presentation of the evaluation process, we define our evaluation criteria. It is followed by the presentation of the main features of three UFA signaling protocol alternatives. Finally, the terminal scores of the alternatives are analyzed under different circumstances. The SIP-based alternative shows high performance, and low deployment cost. It is adequate for IMS applications. However by the increase of the demand to support the mobility of legacy internet applications, HIP or MIP-based signaling schemes are more suitable to our criteria. The evaluation shows the effect of the criteria weights and the network scenario on the suitability of the alternatives.
    Full-text · Article · Aug 2010
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    • "In particular, capacity bounds for AF MIMO relay systems have been derived in [14] and [15], and optimal power allocation schemes which maximize the capacity of AF MIMO relay systems have been studied in [5], [6], and [16]–[18]. Furthermore, for practical applications (such as Winner project, LTE and IMT-Advanced [19], [20]), fixed relay stations with multiple antennas are being considered to be installed at the border of base stations' coverage area, to enhance the coverage of base stations. "
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    ABSTRACT: This paper addresses the problem of robust linear relay precoder and destination equalizer design for a dual-hop amplify-and-forward (AF) multiple-input multiple-output (MIMO) relay system, with Gaussian random channel uncertainties in both hops. By taking the channel uncertainties into account, two robust design algorithms are proposed to minimize the mean-square error (MSE) of the output signal at the destination. One is an iterative algorithm with its convergence proved analytically. The other is an approximated closed-form solution with much lower complexity than the iterative algorithm. Although the closed-form solution involves a minor relaxation for the general case, when the column covariance matrix of the channel estimation error at the second hop is proportional to identity matrix, no relaxation is needed and the proposed closed-form solution is the optimal solution. Simulation results show that the proposed algorithms reduce the sensitivity of the AF MIMO relay systems to channel estimation errors, and perform better than the algorithm using estimated channels only. Furthermore, the closed-form solution provides a comparable performance to that of the iterative algorithm.
    Preview · Article · Apr 2010 · IEEE Transactions on Signal Processing
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