LTE-advanced: next-generation wireless broadband technology [Invited Paper]
TL;DR: An overview of the techniques being considered for LTE Release 10 (aka LTEAdvanced) is discussed, which includes bandwidth extension via carrier aggregation to support deployment bandwidths up to 100 MHz, downlink spatial multiplexing including single-cell multi-user multiple-input multiple-output transmission and coordinated multi point transmission, and heterogeneous networks with emphasis on Type 1 and Type 2 relays.
Abstract: LTE Release 8 is one of the primary broadband technologies based on OFDM, which is currently being commercialized. LTE Release 8, which is mainly deployed in a macro/microcell layout, provides improved system capacity and coverage, high peak data rates, low latency, reduced operating costs, multi-antenna support, flexible bandwidth operation and seamless integration with existing systems. LTE-Advanced (also known as LTE Release 10) significantly enhances the existing LTE Release 8 and supports much higher peak rates, higher throughput and coverage, and lower latencies, resulting in a better user experience. Additionally, LTE Release 10 will support heterogeneous deployments where low-power nodes comprising picocells, femtocells, relays, remote radio heads, and so on are placed in a macrocell layout. The LTE-Advanced features enable one to meet or exceed IMT-Advanced requirements. It may also be noted that LTE Release 9 provides some minor enhancement to LTE Release 8 with respect to the air interface, and includes features like dual-layer beamforming and time-difference- of-arrival-based location techniques. In this article an overview of the techniques being considered for LTE Release 10 (aka LTEAdvanced) is discussed. This includes bandwidth extension via carrier aggregation to support deployment bandwidths up to 100 MHz, downlink spatial multiplexing including single-cell multi-user multiple-input multiple-output transmission and coordinated multi point transmission, uplink spatial multiplexing including extension to four-layer MIMO, and heterogeneous networks with emphasis on Type 1 and Type 2 relays. Finally, the performance of LTEAdvanced using IMT-A scenarios is presented and compared against IMT-A targets for full buffer and bursty traffic model.
Citations
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TL;DR: From the simulation results, by selecting the best modulation technique, the spreading of the signal due to the downstream and upstream process is controlled and such signals are used in various frequency‐based RF signals over various distances in single mode fiber PON.
Abstract: In this study, it is focused on designing a novel architecture for Next Generation Orthogonal Frequency Division Multiplexing (NG‐OFDM), for Passive Optical Networks (PON). This is called as NGOF‐ROFPON (Next generation Optical Fiber – Radio over Fiber PON). In order to improve the efficiency in providing a seamless data transmission and to extend it to all terrains, the Radio‐Over‐Fiber (ROF) transmissions is applied among base stations and remote antennas. For a better decision making on the NGOF‐ROFPON, a simulation‐based experiment is carried out on both OFDM (Orthogonal Frequency Division Multiplexing) and its RF (Radio Frequency) output signals quality performance at receiver side is compared. By analyzing the system parameters in the simulation results collaboratively in optical broadband OFDM and RF OFDM over PON the best performance for a PON architecture is decided as a optimum method to the PON for next generation and referred as NGOF‐ROFPON. Moreover, from the simulation results, by selecting the best modulation technique, the spreading of the signal due to the downstream and upstream process is controlled and such signals are used in various frequency‐based RF signals over various distances in single mode fiber PON.
5 citations
Book•
08 May 2014
TL;DR: This dissertation provides a framework, named SelfFit, for subscriber oriented automatic adaptation of connectivity from core network perspective for access network selection, efficient usage of the core network resources and the data path adaptation, addressing the previous scalability challenge.
Abstract: The current trend in wireless operator networks is towards deploying in parallel a large number of heterogeneous access network technologies and core network functions in order to reach a higher capacity and thus accommodating the communication needs of a high number of connected devices. However, the wireless operator network is designed for handling uniformly all subscribers from the perspective of mobility management, subscription information, resource reservation and charging. The current architecture corroborated with a high increase of connected devices requires a new level of scalability to be attained which is not realizable. This dissertation provides a framework, named SelfFit, for subscriber oriented automatic adaptation of connectivity from core network perspective for access network selection, efficient usage of the core network resources and the data path adaptation, addressing the previous scalability challenge. In these three directions, a set of five innovative self-adaptation concepts for dynamic carrier grade network infrastructures was developed. The concepts were immediately exemplified as additions to the current 3GPP Evolved Packet Core (EPC) architecture, for proving their value in a standard, real-life deployed architecture. Additionally, the functionality was prototyped on top of the Fraunhofer FOKUS OpenEPC toolkit and evaluated on complete realistic testbed setups, providing a practical view on how it can be realized as part of future core network products. For assessing the limitations of existing technologies as well as of the proposed solutions, a rigorous generic evaluation framework was developed including the requirements definition, a simplified network model, qualitative metrics for assessing heterogeneous technologies, and comparative qualitative testbed measurements. The evaluation framework enables the reader to grasp a clear evidence of the innovation value included in this dissertation from innovative idea to pre-product prototyping. Zusammenfassung: Der aktuelle Trend bei Mobilfunknetzen besteht im parallelen Einsatz einer großen Zahl von heterogenen Zugangsnetztechniken und Kernnetzfunktionen, um eine höhere Kapazität zu erreichen und so den Kommunikationsbedürfnissen einer großen Zahl von angeschlossenen Endgeräten gerecht zu werden. Allerdings ist das Mobilfunknetz darauf ausgerichtet, alle Teilnehmer in Bezug auf Mobilitätsbetreuung, Teilnehmerinformationen, Ressourcenzuteilung, sowie Rechnungslegung gleich zu behandeln. Die aktuelle, durch den großen Anstieg der angeschlossenen Geräte bestärkte Architektur, erfordert das Erreichen eines neuen Maßes an Skalierbarkeit, das nicht realisierbar ist. Die vorliegende Dissertation stellt einen Rahmen Namens SelfFit bereit, für eine teilnehmerorientierte, automatische Anpassung der Konnektivität aus der Perspektive des Kernnetzwerks zur Zugangsnetzauswahl, zur effizienten Nutzung der Kernnetzressourcen und der Datenpfadanpassung zur Verfügung, und geht damit auf das bestehende Skalierbarkeitsproblem ein. In diesen drei Richtungen wurde ein Satz von fünf innovativen Selbstanpassungskonzepten für dynamische Netzwerk-Infrastrukturen auf Betreiberniveau entwickelt. Die Konzepte wurden sofort beispielhaft als Ergänzung zur aktuellen 3GPP Evolved Packet Core (EPC) Architektur eingesetzt, um sich in einer normalen, praxisnahen Einsatzarchitektur zu bewähren. Zusätzlich wurde die Funktionalität prototypisch auf dem Fraunhofer FOKUS OpenEPC Toolkit aufgesetzt und auf vollständigen realistischen Prüfstandaufstellungen bewertet, wodurch sichtbar wurde, wie sie in der Praxis als Teil zukünftiger Kernnetzwerk-Produkte realisiert werden könnte. Für die Beurteilung der Grenzen der bestehenden Technologien sowie der vorgeschlagenen Lösungen wurde ein strenger generischer Bewertungsrahmen entwickelt, einschließlich der Anforderungsdefinition, eines vereinfachten Netzwerkmodells, qualitativer Kennzahlen zur Beurteilung heterogener Technologien, sowie vergleichender qualitativer Prüfstandmessungen. Der Bewertungsrahmen liefert dem Leser einen klaren Beweis des in der vorliegenden Dissertation enthaltenen Innovationswerts, von der innovativen Idee bis zur Konstruktion des VorproduktPrototyps.
5 citations
Cites background from "LTE-advanced: next-generation wirel..."
...3GPP [18] has the mission to standardize the large wireless area networks, currently taking the lead of the initial standardization phases for the 4th Generation (4G) of mobile communication systems [83], [84], [85] while supporting 2G and 3G accesses....
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TL;DR: A novel resource allocation scheme based on the channel sensing and the spatial radio resource reuse mechanism is proposed, which enables femto users in the cognitive femtocell to obtain more feasible radio resource.
Abstract: A cognitive femtocell is a new small cell based on a smart home base station to solve the spectrum-scarcity problem. Recently, dedicated resource allocation for cognitive femtocells is extensively researched to mitigate the co-channel interference. However, the cognitive femtocell may suffer from the lack of frequency resource for its users due to high data traffic load of the macrocell. In this paper, we propose a novel resource allocation scheme based on the channel sensing and the spatial radio resource reuse mechanism, which enables femto users in the cognitive femtocell to obtain more feasible radio resource. The simulation results show that the capacity of the cognitive femtocell can be improved under high data traffic load of the macrocell compared to that of the conventional scheme.
5 citations
Proceedings Article•
16 Apr 2013TL;DR: Performance evaluation figures confirm that the end-end wireless packet delay and queue lengths of the high priority queues benefit significantly from the application of the WDSA algorithm without failing the rest of the network performance.
Abstract: This paper evaluates a novel mapping and scheduling scheme which allows efficient control over the quality-of-service (QoS) experienced by long term evolution (LTE) users when backhauled over an orthogonal frequency division multiple access-passive optical network (OFDMA-PON). With respect to mapping, the LTE QoS class identifiers (QCIs) are assigned to the OFDMA-PON priorities based on class-of-service (CoS) differentiation. Scheduling involves the allocation of subcarriers to each optical network unit/enhanced node B (eNB/ONU) ensuring that the bandwidth allocation accounts for the QoS requirements of the respective LTE wireless bearers. Since the transmission pipes allocated to each eNB/ONU are to be shared by all CoS queues, fairness across traffic priorities throughout the network is achieved by introducing a weighted dynamic subcarrier assignment (WDSA) algorithm. Simulations are based on a 10Gbps OFDMA-PON with 1024 subcarriers, 20km reach and 32 eNB/ONUs. Performance evaluation figures confirm that the end-end wireless packet delay and queue lengths of the high priority queues benefit significantly from the application of the WDSA algorithm without failing the rest of the network performance.
5 citations
01 Dec 2017
TL;DR: The transporter gathering is highlighted which supports the between band mixture connecting part bearers, intra-band add up to non-touching fragment bearers and between band aggregation and there benefits in arrange.
Abstract: LTE-Advanced framework is monetarily available at extended speed while LTE is updating well ordered and gave speedier broadband organizations. LTE passed on every one of these upgrades by offering the best in a class mix of new air interface base development (OFDMA/SC-FDMA) and more noticeable flexibility for utilizing range. As we understand that LTE has flexibility of information exchange limit decision and it goes up to 20 MHz transmission limit (BW). On account of this versatile nature, it can suit various customers with change and the blend of information transmission relegated to the chairman. LTE-Advanced is required for higher data rates and full extension in a future circumstance. One of the key components of LTE-Advanced is conveyor add up to. All executives are moving towards Carrier Aggregation as this component keeps up the idea of the framework and augmentation the customer contribution to the extent data rates and apex customer throughput. This paper highlights the transporter gathering which supports the between band mixture connecting part bearers, intra-band add up to non-touching fragment bearers and between band aggregation. This paper similarly focuses on various circumstance of utilization of Carrier Aggregation and there benefits in arrange.
5 citations
Cites background from "LTE-advanced: next-generation wirel..."
...The vital LTE Advanced points of interest [1] are depended upon to be set in mid 2011 while appraisals drove by 3GPP givers and external social events have demonstrated that LTE-A meets all the IMT-Advanced necessities [2,3]....
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...The key piece of the conveyor mixture is to give the ability to transmit data to single UE on the no less than two gatherings in the meantime [1,6,7] as showed up in Figure 2....
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References
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01 Sep 2006
TL;DR: A preliminary look at the air interface for Evolved UTRA (E-UTRA) and associated key technologies required to reach its design objectives are provided.
Abstract: With the emergence of packet-based wireless broadband systems such as 802.16e, it is evident that a comprehensive evolution of the universal mobile telecommunications system specifications is required to remain competitive. As a result, work has begun on long term evolution (LTE) of the UMTS terrestrial radio access and radio access network aimed for commercial deployment in 2010. Goals for the evolved system include support for improved system capacity and coverage, high peak data rates, low latency, reduced operating costs, multi-antenna support, flexible bandwidth operations and seamless integration with existing systems. To reach these goals, a new design for the air interface is envisioned. This paper provides a preliminary look at the air interface for Evolved UTRA (E-UTRA) and associated key technologies required to reach its design objectives. Initial E-UTRA system performance results show a 2 to 3x improvement over a reference Rel-6 UMTS system configuration [1, 2] for both uplink and downlink.
30 citations
24 Oct 2008
TL;DR: The proposed channel estimation technique is shown to have significant gains in performance compared to other well known channel estimation techniques such as the maximum-likelihood (ML) and the inverse fast Fourier transform (IFFT) channel estimation methods.
Abstract: The performance of the uplink physical channel of the 3GPP LTE system is considered in this paper. Assuming a single user spatial division multiple access transmission scheme, where users' signals are transmitted over different subcarriers, a low complexity channel estimation technique is proposed for the physical uplink shared channel (PUSCH). The proposed channel estimation technique is shown to have significant gains in performance compared to other well known channel estimation techniques such as the maximum-likelihood (ML) and the inverse fast Fourier transform (IFFT) channel estimation methods [5]. Simulation results for different channel models and modulation and coding schemes (MCS) using incremental redundancy (IR) based hybrid automatic repeat request (HARQ) operation are also shown. Finally, a robust detection scheme is proposed for the physical uplink control channel (PUCCH) and simulation results are summarized.
10 citations
"LTE-advanced: next-generation wirel..." refers methods in this paper
...The DFT precoding operation is performed to reduce the cubic metric (CM) of the signal, leading to higher maximum transmit power [2]....
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