On the Coverage Extension and Capacity Enhancement of Inband Relay Deployments in LTE-Advanced Networks (original) (raw)

Relays-enhanced LTE-Advanced networks performance studies

2011

This paper proposes a study on the performance of multi-hop relays networks. We demonstrate the importance of the relays for coverage and capacity enhancement and study how the number of relays and their position inside the cell impact the performance, and how an efficient relay location scheme can guarantee better performance with less relays per cell. Further we give an estimation of the amount of power per square meter on the ground when relays are used, with respect to traditional network, showing the fundamental role of relays for green networking. We consider the downlink of an LTE-Advanced network, in which all the User Equipments (UE) are supposed to be attached to the eNode-B (eNB) or Relay Node (RN) from which they receive more power. Numerical results are obtained through Monte-Carlo simulations and the performance measures are represented by the average effective Signal to Interference and Noise Ratio (SINR) and the average spectral efficiency.

Performance Analysis of Relay Enhanced LTE-Advanced Network

International Journal of Computer Applications

Long Term Evaluation (LTE) Advanced networks are popular due to very high data rates with ultra-wide bandwidth spectrum, and broad coverage and are currently adopted as 4G standard. In spite of vast benefits of LTE Advanced, the propagation loss occurs due to low signal-to-noise-ratio (SNR) and results in low coverage and channel capacity at the cell boundaries. To overcome these problems, cooperative communication network is used by deploying relay nodes. In this paper, we conduct the performance analysis of LTE Advanced relay system on WINNER channel model with various communication scenarios. The simulations environment for the LTE Advanced network and WINNER channel models is created using Matlab. For easiness, only one base station and user equipment are used in the simulation setup. We observe the effect on LTE performance using one or two relay nodes in the LTE network. We conduct the experiments for four different environments and six scenarios. We analyze the performance using symbol-error-rate for different SNR. The results show that LTE Advanced network using relay nodes performs much better than other environments. It also provides least latencies, even wider coverage, and higher data rate with minimum outage.

Optimized dual relay deployment for LTE-Advanced cellular systems

2012 IEEE Wireless Communications and Networking Conference (WCNC), 2012

LTE-Advanced adopts relay deployment to support higher data rates and better coverage, especially at the cell edges which suffer from inter-cell interference. The solution of relaying is attractive because of its low cost and easy deployment. In this paper, we show that deploying just two relays per sector can significantly improve system capacity and coverage. We optimize the geometric deployment of relays that maximizes the spectral efficiency of the worst users or minimize outage. We consider the effects of different backhauling techniques such as wirelessly connected relays or wired radio remote heads. We also investigate the effect of different downlink frame structures and their impact on the system capacity or outage. The paper shows that the proper choice of the geometric deployment, frame structure and backhauling technique of the relays can improve the performance of LTE-Advanced.

Relay architectures for 3GPP LTE-Advanced

2009

The Third Generation Partnership Project's Long Term Evolution-Advanced is considering relaying for cost-effective throughput enhancement and coverage extension. While analog repeaters have been used to enhance coverage in commercial cellular networks, the use of more sophisticated fixed relays is relatively new. The main challenge faced by relay deployments in cellular systems is overcoming the extra interference added by the presence of relays. Most prior work on relaying does not consider interference, however. This paper analyzes the performance of several emerging half-duplex relay strategies in interference-limited cellular systems: one-way, two-way, and shared relays. The performance of each strategy as a function of location, sectoring, and frequency reuse are compared with localized base station coordination. One-way relaying is shown to provide modest gains over singlehop cellular networks in some regimes. Shared relaying is shown to approach the gains of local base station coordination at reduced complexity, while two-way relaying further reduces complexity but only works well when the relay is close to the handset. Frequency reuse of one, where each sector uses the same spectrum, is shown to have the highest network throughput. Simulations with realistic channel models provide performance comparisons that reveal the importance of interference mitigation in multihop cellular networks.

Optimal relay placement for coverage extension in LTE-A cellular systems

2012 National Conference on Communications (NCC), 2012

Third Generation Partnership Project (3GPP) Long Term Evolution-Advanced (LTE-A) has considered the deployment of Relay Nodes (RNs) for cost-effective throughput enhancement and coverage extension. The coverage extension (increase in cell radius) depends on the radial position of RNs in the cell. This is because the location of a RN affects the Signal-to-Interference-plus-Noise Ratio (SINR) of the received signal on the evolved-NodeB (eNB)-RN and RN-User Equipment (UE) links. In this paper, we investigate the problem of optimal relay placement for coverage extension in relay assisted LTE-A networks. Since DownLink (DL) and UpLink (UL) transmission scenarios in cellular networks are asymmetrical in terms of coverage (due to discrepancy in maximum transmit power), we consider both DL and UL transmission scenarios for optimal relay placement. In addition, we analyze the problem for the case when interference from neighbouring cells is taken into account.

Relaying operation in 3GPP LTE: challenges and solutions

IEEE Communications Magazine, 2000

With the ever growing demand of data applications, traditional cellular networks face the challenges of providing enhanced system capacity, extended cell coverage, and improved minimum throughput in a cost-effective manner. Wireless relay stations, especially when operating in a halfduplex operation, make it possible without incurring high site acquisition and backhaul costs. Design of wireless relay stations faces the challenges of providing backward compatibility, minimizing complexity, and maximizing efficiency. This article provides an overview of the challenges and solutions in the design of relay stations as one of the salient features for 3GPP LTE advanced.

Performance of Amplify-and-Forward and Decode-and-Forward Relays in LTE-Advanced

2009 IEEE 70th Vehicular Technology Conference Fall, 2009

Current broadband wireless networks are characterized by large cell sizes. Yet, even in advanced networks, users on the cell edge will face relatively low Signal-to-Interference-plus-Noise-Ratio (SINR). An attractive solution for this problem is provided by multi-hop technologies. In this paper, we consider the performance of full duplex Amplify-and-Forward (AF) and half duplex Decode-and-Forward (DF) Relay Nodes (RNs) from 3G LTE-Advanced perspective. The comparison between AF and DF relaying is important because both approaches are currently under consideration in LTE-Advanced study item in 3GPP. Performance evaluation considers AF RN loop back signal interference and concurrent DF RN transmissions on the access link. Results show that the concurrent transmissions improve the spectral efficiency for DF RN over performing AF RN.

Resource allocation in relay enhanced LTE-Advanced networks

EURASIP Journal on Wireless Communications and Networking, 2012

Relay deployment in future mobile networks is a vital measure to enhance the coverage region of regular base stations, to overcome shadowing dips, and to bring improvements in the cell-edge performance. In this regard, resource allocation in a relay-enhanced scenario is a key design task, and has become a very interesting research topic over the past few years. In this article, we study two main resource allocation aspects of a relay-enhanced scenario. First, we concentrate on the problem of multiplexing the relay backhaul link and the direct link at the base station scheduler for in-band as well as out-band relay operations. We propose three distinct resource partitioning strategies, and evaluate their performance via long-term evolution (LTE) system level simulations in the downlink direction. We observe that even the low implementation effort algorithms bring appreciable improvement for the cell-edge users with or without small loss in performance for the other users, thereby enhancing system fairness. Second, we visit the problem of supporting heterogeneous quality of service (QoS) requirements in a multi-user relay-enhanced network. To this end, we introduce a QoS-aware scheduler which uses packet latency and rate requirements to prioritise the scheduling decisions. Moreover, we also propose a mechanism to support QoS-constrained services to the relayed users, served over two (or more) hops. Employing an LTE system level simulator, for relay-enhanced scenario with a traffic mix having distinct QoS requirements, we demonstrate that the proposed QoS-aware resource allocation strategy significantly increases the fraction of QoS-satisfied users.

Configuration and Demonstration of Relay-Enhanced Technique in LTE-Advanced Systems

— LTE (Long Term Evolution) specified by 3GPP (3 rd Generation Partnership Project) as very high flexible for radio interfacing. LTE deployment started in the last of 2009 and the first LTE release is providing greatest rate reaches to 300 Mbps, delay of radio network not as much of as 5 msec, a spectrum significant increasing in efficiency of spectrum if comparing with any other cellular systems, and a different regular architecture in radio network that is designed to shorten the operations and to decreasing the cost. Long Term Evolution Advanced (LTE-Advanced) network is the continuation of 3GPP-LTE and it targets to advanced develop of the requirements of LTE in terms of throughput and coverage. Recently, LTE-Advanced network is the promised candidate for 4G cellular systems to run into top rates of data reaches to 100 Mbps with high mobility and 1Gbps with low mobility, where that are wanted in 4G system. Furthermore, LTE-Advanced must be capable to upkeep broader bandwidth than it provided by LTE. This article offered the architecture and the model of LTE-Advanced with the configurations of the relay-Enhanced technology used in this system that are improved to enhance the radio signal between the mobile station and the base station in LTE-Advanced system.