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: Performance analysis revealed that varying time to trigger (TTT) values significantly impact radio link failure (RLF), ping pong effect as well as call drop ratio (CDR) and Handover ratio (HOR) at changing users’ velocities, ensuring that REHO continuously achieves increased energy efficiency compared to LTE standard.
Abstract: Data hungry users engage radio resources over long periods of time thus resulting into higher energy consumption by Base Stations (BSs). Mobile operators’ operational expenditure (OPEX) is directly affected by augmented electricity bills due to increased power consumption, thereby ensuing reduced economic and environmental benefits, i.e. profitability of vendors and green communication accordingly. This work provides performance analysis of our proposed reduced early handover (REHO) scheme which results in increased energy efficiency. Impact of reduced energy consumption is shown on OPEX, as well as greener aspects are investigated by inclusion of real life commercial tariffs adopted by one of the mobile operators in the UK. Performance analysis revealed that varying time to trigger (TTT) values significantly impact radio link failure (RLF), ping pong effect as well as call drop ratio (CDR) and Handover ratio (HOR), at changing users’ velocities. Paper investigates and provides a very useful insight for superlative value of TTT for unbiased RLF and Ping Pong, which can help vendors not only to achieve increased energy efficiency, but also maintain other salient performance parameters within acceptable limits. The work also achieves the fact that the time difference in terms of transmission time intervals (TTIs) for reduced early handover in REHO, always remain the same irrespective of the value of TTT, thus ensuring that REHO continuously achieves increased energy efficiency compared to LTE standard.
7 citations
Patent•
22 Dec 2010TL;DR: In this article, a method for measuring inter-frequency in a receiver including a plurality of reception antennas is described, which may include the steps of: performing a service using a first frequency through a first antenna and/or a second antenna; measuring a second frequency using the first antenna while the service continues to be performed using the second frequency through the second antenna.
Abstract: According to an embodiment of the present invention, a method is provided for measuring inter-frequency in a receiver including a plurality of reception antennas. The method may comprise the steps of: performing a service using a first frequency through a first antenna and/or a second antenna; measuring a second frequency using the first antenna while the service continues to be performed using the first frequency through the second antenna; and estimating the measurement result without the second frequency being practically measured through the second antenna by using the measurement result of the second frequency through the first antenna.
7 citations
TL;DR: A novel radio resource coordination and scheduling scheme in an ultra-dense cloud-based small cell network that can increase the system throughput by 20% compared with the clustering-based algorithm, decrease the signaling overhead by about 50%, and improve network’s quality of service is proposed.
Abstract: In a 5G ultra-dense network, dynamic network topology and traffic patterns lead to excessive system overhead and complex radio resource conflicts. The cloud radio access network and the fog computing have the advantages of high computation capabilities and low transmission delays. Therefore, by taking full advantage of these two characteristics, this study proposes a novel radio resource coordination and scheduling scheme in an ultra-dense cloud-based small cell network. Interference among small cells (or remote radio heads) can be avoided by implementing centralized cooperative processing in the base band unit pool in advance. Resource sharing in coordination and transfer depend on fog computing to relieve the overloaded cloud processing platform and reduce transmission delays, thereby maximizing resource utilization and minimizing system overhead when the network topology and number of users change dynamically. The simulation shows that the proposed scheme can increase the system throughput by 20% compared with the clustering-based algorithm; it can also increase system throughput by 33% compared with the graph coloring algorithm, decrease the signaling overhead by about 50%, and improve network’s quality of service.
7 citations
05 Jun 2017
TL;DR: A new architecture with emphasis on management applications of Heterogeneous Radio Access Networks (RANs) following Software-Defined Networking (SDN) paradigm is investigated and fairness index and capacity value are improved and joint evaluation of RAN controller's applications including radio resource management techniques are provided.
Abstract: Heterogeneous Networks (HetNets) adopted into Long Term Evolution Advanced networks, have become major candidate for next generation mobile networks. In HetNets, resource and interference management techniques become crucial to ensure high spectral as well as power efficiencies for Mobile Network Operators (MNOs) since they use frequency reuse of one and include cells that serve overlapping coverage regions. In this paper, we investigate a new architecture with emphasis on management applications of Heterogeneous Radio Access Networks (RANs) following Software-Defined Networking (SDN) paradigm. After giving brief explanations about advanced interference management techniques (i.e., enhanced inter-cell interference cancellation (eICIC) and Coordinated Multipoint (CoMP) transmission/reception) that are realized to top of the SDN/RAN controller, we present Monte-Carlo simulation results with the awareness of global view of the network infrastructure. Jain's fairness index and Shannon capacity are considered as key performance indicators. The simulation results indicate both fairness index and capacity value are improved with the use of eICIC technique and CoMP mechanism provides better service quality for cell-edge user equipments. SDN paradigm ensures realization of flexible architectures that can provide modular and pluggable platform for MNOs and we further provide joint evaluation of RAN controller's applications including radio resource management techniques.
7 citations
Cites background from "LTE-advanced: next-generation wirel..."
...Currently used cellular networks’ requirements have been initiated by International Telecommunication Union (ITU) as International Mobile Telecommunications - Advanced (IMT-A) [2]....
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...On the other hand, the provided network specifications have not been sufficient to meet the IMT-A requirements....
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18 Dec 2014
TL;DR: A novel strategy ensuring ultra-fast, safe and reliable wireless data transfer in mobile networks is proposed, combining the advantages of `standard' network architectures with non-conventional data transfer modalities.
Abstract: A novel strategy ensuring ultra-fast, safe and reliable wireless data transfer in mobile networks is proposed. By starting from state-of-the-art concepts in the present day mobile networks and by examining specific, largely underused, potentials in electromagnetic (EM) field propagation, a transforming paradigm, combining the advantages of `standard' network architectures with non-conventional data transfer modalities is put forward. The elements that are deemed requisite for one specific implementation of this paradigm are briefly cataloged.
7 citations
Cites background from "LTE-advanced: next-generation wirel..."
...The present state-of-the-art in ultra-fast data transfer is offered by Long Term Evolution (LTE) (see [5] for an overview of the basic concepts and performance metrics), with its ’Advanced’ version already supported by selected wireless providers [3]....
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...Nonetheless, the highest data-rate can only be offered by pico- and femto-cells [3], [5], with (very) low spatial extent and relatively few users/cell....
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...• physical bandwidth Bph – the physical bandwidth allocated for the relevant service; • effective bandwidth Beff – the effectively available bandwidth after carrier aggregation [5], [8]...
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...According to its specifications [3], [5], LTE– Advanced can, theoretically, achieve download data-rates of up to 3Gb/s and upload rates of up to 1....
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...The net result is an overgrown backhaul that starts having a large footprint on the network resources (see the analysis in [5])....
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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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