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Preben Mogensen - One of the best experts on this subject based on the ideXlab platform.
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Autonomous Component Carrier Selection for 4G Femtocells — A Fresh Look at an Old Problem
IEEE Journal on Selected Areas in Communications, 2012Co-Authors: L. G. Uzeda Garcia, Gustavo Wagner Oliveira Da Costa, Istvan Z. Kovacs, Klaus I. Pedersen, Preben MogensenAbstract:This paper addresses the interference management problem in the context of LTE-Advanced femtocells. Due to the expected large number of user-deployed cells, centralized network planning becomes increasingly less viable. Consequently, we consider an architecture of autonomous decision makers. Our main contribution in this paper, denominated Generalized Autonomous Component Carrier Selection (G-ACCS), is a distributed Carrier-based inter-cell interference coordination scheme that represents one step towards cognitive radio networks. The algorithm relies on expected rather than sensed interference levels. This approach facilitates scheduler-independent decisions, however, it can lead to overestimation of the interference coupling among cells when the resources are not fully utilized. Acknowledging this fact, G-ACCS leverages the power domain to circumvent the restrictive nature of expected interference coupling. This work focuses on the downlink and also provides an extensive characterization of the network performance as a function of the topology as well as the often overlooked temporal traits of traffic. We compare G-ACCS with other Carrier-based solutions, including the simplest universal reuse strategy. The encouraging simulation results demonstrate that G-ACCS achieves an efficient and fair distribution of resources in all considered traffic and deployment conditions. More importantly, this is attained in a truly autonomous fashion, without any explicit parametrization.
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autonomous Component Carrier selection for 4g femtocells a fresh look at an old problem
IEEE Journal on Selected Areas in Communications, 2012Co-Authors: L Uzeda G Garcia, Gustavo Wagner Oliveira Da Costa, Istvan Z. Kovacs, Klaus I. Pedersen, Preben MogensenAbstract:This paper addresses the interference management problem in the context of LTE-Advanced femtocells. Due to the expected large number of user-deployed cells, centralized network planning becomes increasingly less viable. Consequently, we consider an architecture of autonomous decision makers. Our main contribution in this paper, denominated Generalized Autonomous Component Carrier Selection (G-ACCS), is a distributed Carrier-based inter-cell interference coordination scheme that represents one step towards cognitive radio networks. The algorithm relies on expected rather than sensed interference levels. This approach facilitates scheduler-independent decisions, however, it can lead to overestimation of the interference coupling among cells when the resources are not fully utilized. Acknowledging this fact, G-ACCS leverages the power domain to circumvent the restrictive nature of expected interference coupling. This work focuses on the downlink and also provides an extensive characterization of the network performance as a function of the topology as well as the often overlooked temporal traits of traffic. We compare G-ACCS with other Carrier-based solutions, including the simplest universal reuse strategy. The encouraging simulation results demonstrate that G-ACCS achieves an efficient and fair distribution of resources in all considered traffic and deployment conditions. More importantly, this is attained in a truly autonomous fashion, without any explicit parametrization.
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VTC Spring - On the Impact of Explicit Uplink Information on Autonomous Component Carrier Selection for LTE-A Femtocells
2011 IEEE 73rd Vehicular Technology Conference (VTC Spring), 2011Co-Authors: Fernando Sanchez-moya, Luis G. Uzeda Garcia, Klaus I. Pedersen, Juan Villalba-espinosa, Preben MogensenAbstract:The increasing popularity of the femtocell concept has revamped the interest in dynamic interference coordination techniques for dense and uncoordinated deployments of low- power home base stations. One of the proposed schemes for 4G OFDMA femtocells is known as Autonomous Component Carrier Selection (ACCS). ACCS capitalizes on the Carrier aggregation framework of LTE-Advanced to curb inter-cell interference levels. Albeit being exclusively based on downlink information, previous contributions attested the effectiveness of the scheme in the uplink as well. This paper extends the initial argumentation by including uplink information into the Component Carrier selection process. We assess and discuss the uplink performance of two proposed variants of ACCS via extensive system level simulations. The striking conclusion based on the results is that the mere addition of uplink information, which is difficult to estimate in the real world, does not provide substantial performance improvements.
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VTC Spring - System Level Analysis of ACK/NACK Bundling for Multi-Component Carrier LTE-Advanced
2011 IEEE 73rd Vehicular Technology Conference (VTC Spring), 2011Co-Authors: Yuanye Wang, Klaus I. Pedersen, Troels B. Sorensen, Preben MogensenAbstract:This paper focuses on reducing the uplink overhead caused by Acknowledgement (ACK)/Non-acknowledgement (NACK) signaling in an Long Term Evolution (LTE)-Advanced system. Such a system typically aggregates multiple Component Carrier (CC)s to obtain a wide bandwidth. Usually it has much larger feedback overhead than the single-CC system, and hence reducing the overhead is of special importance. A technique called ACK/NACK bundling has been used for the overhead reduction of the ACK/NACK signaling. Along with the overhead reduction, the downlink performance is also degraded. The tradeoff between the downlink performance and the overhead is analyzed under various load conditions and antenna configurations. The presented results can be used for selecting the proper bundling scheme based on specific system setting.
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VTC Fall - Autonomous Component Carrier Selection for Local Area Uncoordinated Deployment of LTE-Advanced
2009 IEEE 70th Vehicular Technology Conference Fall, 2009Co-Authors: Luis G. Uzeda Garcia, Klaus I. Pedersen, Preben MogensenAbstract:Uncoordinated deployment of eNBs in local area environments will benefit from having support for dynamic frequency re-use mechanisms also known as "autonomous com- ponent Carrier selection", where each eNB dynamically selects to use only a subset of the available Component Carriers (i.e. using from one Component Carrier up to the maximum num- ber of available Component Carriers). Component Carriers are selected autonomously by each eNB depending on the offered traffic, interference coupling with neighboring cells, etc. In this contribution we propose a simple and distributed scheme based on so-called background interference matrices (BIMs) for autonomous Component Carrier selection. Extensive numerical simulation campaigns indicate that the proposed scheme effec- tively allows each eNB to select the most attractive frequency configuration; improving average user capacity and boosting cell edge performance considerably. Index Terms—Spectrum-sharing, LTE-Advanced, Local Area, Self-organizing, Inter-cell Interference Coordination (ICIC).
Klaus I. Pedersen - One of the best experts on this subject based on the ideXlab platform.
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Autonomous Component Carrier Selection for 4G Femtocells — A Fresh Look at an Old Problem
IEEE Journal on Selected Areas in Communications, 2012Co-Authors: L. G. Uzeda Garcia, Gustavo Wagner Oliveira Da Costa, Istvan Z. Kovacs, Klaus I. Pedersen, Preben MogensenAbstract:This paper addresses the interference management problem in the context of LTE-Advanced femtocells. Due to the expected large number of user-deployed cells, centralized network planning becomes increasingly less viable. Consequently, we consider an architecture of autonomous decision makers. Our main contribution in this paper, denominated Generalized Autonomous Component Carrier Selection (G-ACCS), is a distributed Carrier-based inter-cell interference coordination scheme that represents one step towards cognitive radio networks. The algorithm relies on expected rather than sensed interference levels. This approach facilitates scheduler-independent decisions, however, it can lead to overestimation of the interference coupling among cells when the resources are not fully utilized. Acknowledging this fact, G-ACCS leverages the power domain to circumvent the restrictive nature of expected interference coupling. This work focuses on the downlink and also provides an extensive characterization of the network performance as a function of the topology as well as the often overlooked temporal traits of traffic. We compare G-ACCS with other Carrier-based solutions, including the simplest universal reuse strategy. The encouraging simulation results demonstrate that G-ACCS achieves an efficient and fair distribution of resources in all considered traffic and deployment conditions. More importantly, this is attained in a truly autonomous fashion, without any explicit parametrization.
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autonomous Component Carrier selection for 4g femtocells a fresh look at an old problem
IEEE Journal on Selected Areas in Communications, 2012Co-Authors: L Uzeda G Garcia, Gustavo Wagner Oliveira Da Costa, Istvan Z. Kovacs, Klaus I. Pedersen, Preben MogensenAbstract:This paper addresses the interference management problem in the context of LTE-Advanced femtocells. Due to the expected large number of user-deployed cells, centralized network planning becomes increasingly less viable. Consequently, we consider an architecture of autonomous decision makers. Our main contribution in this paper, denominated Generalized Autonomous Component Carrier Selection (G-ACCS), is a distributed Carrier-based inter-cell interference coordination scheme that represents one step towards cognitive radio networks. The algorithm relies on expected rather than sensed interference levels. This approach facilitates scheduler-independent decisions, however, it can lead to overestimation of the interference coupling among cells when the resources are not fully utilized. Acknowledging this fact, G-ACCS leverages the power domain to circumvent the restrictive nature of expected interference coupling. This work focuses on the downlink and also provides an extensive characterization of the network performance as a function of the topology as well as the often overlooked temporal traits of traffic. We compare G-ACCS with other Carrier-based solutions, including the simplest universal reuse strategy. The encouraging simulation results demonstrate that G-ACCS achieves an efficient and fair distribution of resources in all considered traffic and deployment conditions. More importantly, this is attained in a truly autonomous fashion, without any explicit parametrization.
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uplink Component Carrier selection for lte advanced systems with Carrier aggregation
International Conference on Communications, 2011Co-Authors: Hua Wang, Claudio Rosa, Klaus I. PedersenAbstract:Carrier aggregation (CA) is one of the key features for LTE-Advanced. By means of CA, two or more Component Carriers (CCs) can be aggregated to form a much wider transmission bandwidth up to 100 MHz in order to meet the IMT-Advanced requirements. With CA, it is possible to schedule a user equipment (UE) on multiple Component Carriers simultaneously. From radio resource management (RRM) perspective, CC selection plays an important role in optimizing the system performance with CA. In this paper, we investigate the uplink resource allocation for LTE-Advanced Systems, i.e., how to assign CCs to different users, and how to do the power scaling for each user. A pathloss threshold based CC selection algorithm is proposed to distinguish between power-limited and non-power-limited LTE-Advanced UEs, and assign only one CC to power-limited LTE-Advanced UEs, while assign multiple CCs to non-power-limited LTE-Advanced UEs. Simulation results show that the derived pathloss threshold works effectively and efficiently compared to other thresholds, and the proposed CC selection algorithm can achieve much better performance in terms of cell edge, average, and cell center user throughput compared to blindly assigning all LTE-Advanced UEs on all CCs.
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VTC Spring - On the Impact of Explicit Uplink Information on Autonomous Component Carrier Selection for LTE-A Femtocells
2011 IEEE 73rd Vehicular Technology Conference (VTC Spring), 2011Co-Authors: Fernando Sanchez-moya, Luis G. Uzeda Garcia, Klaus I. Pedersen, Juan Villalba-espinosa, Preben MogensenAbstract:The increasing popularity of the femtocell concept has revamped the interest in dynamic interference coordination techniques for dense and uncoordinated deployments of low- power home base stations. One of the proposed schemes for 4G OFDMA femtocells is known as Autonomous Component Carrier Selection (ACCS). ACCS capitalizes on the Carrier aggregation framework of LTE-Advanced to curb inter-cell interference levels. Albeit being exclusively based on downlink information, previous contributions attested the effectiveness of the scheme in the uplink as well. This paper extends the initial argumentation by including uplink information into the Component Carrier selection process. We assess and discuss the uplink performance of two proposed variants of ACCS via extensive system level simulations. The striking conclusion based on the results is that the mere addition of uplink information, which is difficult to estimate in the real world, does not provide substantial performance improvements.
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VTC Spring - System Level Analysis of ACK/NACK Bundling for Multi-Component Carrier LTE-Advanced
2011 IEEE 73rd Vehicular Technology Conference (VTC Spring), 2011Co-Authors: Yuanye Wang, Klaus I. Pedersen, Troels B. Sorensen, Preben MogensenAbstract:This paper focuses on reducing the uplink overhead caused by Acknowledgement (ACK)/Non-acknowledgement (NACK) signaling in an Long Term Evolution (LTE)-Advanced system. Such a system typically aggregates multiple Component Carrier (CC)s to obtain a wide bandwidth. Usually it has much larger feedback overhead than the single-CC system, and hence reducing the overhead is of special importance. A technique called ACK/NACK bundling has been used for the overhead reduction of the ACK/NACK signaling. Along with the overhead reduction, the downlink performance is also degraded. The tradeoff between the downlink performance and the overhead is analyzed under various load conditions and antenna configurations. The presented results can be used for selecting the proper bundling scheme based on specific system setting.
Mohammed Atiquzzaman - One of the best experts on this subject based on the ideXlab platform.
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QSHINE - Primary Component Carrier Assignment in LTE-A
Lecture Notes of the Institute for Computer Sciences Social Informatics and Telecommunications Engineering, 2017Co-Authors: Husnu S. Narman, Mohammed AtiquzzamanAbstract:Bandwidth requirement for mobile data traffic is on the rise because of increasing number of mobile users. To answer the requirement, Carrier Aggregation is proposed. With Carrier Aggregation and MIMO, operators can provide up to 3 Gbps download speed. In Carrier Aggregation, several Component Carriers from multiple bands are assigned to users. The assigned Component Carriers are classified as Primary and Secondary Component Carriers. The Primary Component Carrier (PCC) is the main Carrier and only updated during the handover and cell reselection but Secondary Component Carriers (SCC) are auxiliary Carriers to boost data rates and can be activated/deactivated anytime. During the Carrier assignment operations, PCC reassignment can lead packet interruptions because reassignments of PCC to users can lead SCCs reassignment. Several methods have been proposed to increase the efficiency of the Carrier assignment operations. However, none of them shows the system performance if LTE-A can have a procedure which allows one of SCCs to handle the duties of PCC during the PCC reassignment to eliminate packet transfer interruption. Therefore, we have used four different Carrier assignment methods to investigate the performance of LTE-A with and without the procedure. Results show that distinct Carrier assignment methods are differently affected by the procedure. Our results and analysis will help service providers and researchers to develop efficient Carrier assignment methods.
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Joint and selective periodic Component Carrier assignment for LTE-A
Computer Networks, 2016Co-Authors: Husnu S. Narman, Mohammed Atiquzzaman, Mehdi Rahmani-andebili, Haiying ShenAbstract:The bandwidth demand for mobile Internet access is significantly increased with the number of mobile users. Carrier aggregation has been proposed to answer this demand in mobile networks. In Carrier aggregation, the best available one or more Component Carriers of each band are assigned to each user to provide efficient services. Several works have been reported in the literature on mandatory and periodic Component Carrier assignment methods. Although the former works, especially periodic Component Carrier assignment methods, have significantly improved the performance of LTE-A systems, many limitations still exist. One limitation of previous works is that data transfer is interrupted during periodic Component Carrier assignment operations thus, decrease the performance of the system. Therefore, in this paper, selective periodic Component Carrier assignment technique, which allows continuous data transfer during periodic Carrier assignment operations, is proposed and followed by integration of selective technique into four Component Carrier assignment methods: Least Load, Least Load Rate, Random, and Channel Quality to observe the performance improvements. Results indicate that the proposed selective technique increases the throughput ratio up to 18% and decreases average delay up to 50%. Our analysis and proposed technique will assist service providers to build efficient periodic Component Carrier assignment methods to improve the performance of the system by reducing delay and increasing throughput ratio.
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GLOBECOM - Selective Periodic Component Carrier Assignment Technique in LTE and LTE-A Systems
2015 IEEE Global Communications Conference (GLOBECOM), 2015Co-Authors: Husnu S. Narman, Mohammed AtiquzzamanAbstract:Internet usage over mobile devices is on the rise. The bandwidth demand for mobile Internet access is also increasing with the number of mobile users. To answer users' demand, Carrier aggregation is proposed in LTE-A system. In Carrier aggregation, the best available one or more Component Carriers of each band are assigned to each user to provide efficient services. Several works have been reported in the literature on mandatory and periodic Component Carrier assignment methods. Although the previous works, especially periodic Component Carrier assignment methods, have significantly improved performance of LTE and LTE- A systems, many limitations still exist. One limitation of previous works is that data transfer is interrupted during periodic Component Carrier assignment operation which can decrease performance of the system. Therefore, in this paper, selective periodic Component Carrier assignment technique which allows continues data transfer during periodic Carrier assignment operations is proposed. Results show that the proposed technique increases throughput rate up to 25% and decreases average delay time up to 35%.
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GLOBECOM - Analysis of Joint and Partial Component Carrier Assignment Techniques in LTE and LTE-A
2015 IEEE Global Communications Conference (GLOBECOM), 2015Co-Authors: Husnu S. Narman, Mohammed AtiquzzamanAbstract:Large multimedia files are accessed by a high number of mobile users over the Internet. Therefore, the bandwidth demand for mobile Internet access is increasing exponentially. To answer users' demand, Carrier aggregation is proposed in LTE-A. In Carrier aggregation, the best available one or more Component Carriers of each band are assigned as primary and secondary Component Carriers to each user for efficient services. The previous works have significantly improved the performance of LTE-A by using efficient Component Carrier assignment methods. The previous works, however, have two limitations. First, they have not investigated which of joint or partial secondary Component Carrier assignment techniques shows better performance. Second, overall system performance is analyzed in order to evaluate methods by ignoring system behavior such as packet drops and delay metrics during Carrier reassignment operations. Therefore, in this paper, firstly, packet drops and delay which are experienced by users during the Carrier reassignment process are investigated. Secondly, joint and partial secondary Component Carrier assignment techniques are compared. Results show that the partial Carrier assignment technique increases efficiency of resource usage, throughput rate up to 15% and decreases average delay time up to 12%.
Lan Chen - One of the best experts on this subject based on the ideXlab platform.
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improved Component Carrier selection method for non continuous Carrier aggregation in lte advanced systems
Vehicular Technology Conference, 2011Co-Authors: Hui Tian, Jianchi Zhu, Songtao Gao, Lan ChenAbstract:In order to meet the requirement of wider bandwidth in IMT-Advanced, Carrier aggregation (CA) is introduced by 3GPP to support bandwidth up to 100MHz in its LTE-Advanced standards. An LTE Rel.10 UE can aggregate up to 5 Component Carriers (CCs) simultaneously, but may be assigned only part of the total available CCs depending on its capability or traffic load. Thus, a proper CC selection method is necessary. First, two traditional CC selection methods respectively named Random and Round Robin CC selection are investigated, which can well balance the load across different CCs. However, neither of them is suitable for non-continuous CA scenarios through our analysis. To solve this problem, an improved CC selection method for non-continuous CA is proposed in this paper. Simulation results demonstrate that the proposed method outperforms both of the traditional ones.
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Component Carrier management for Carrier aggregation in lte advanced system
Vehicular Technology Conference, 2011Co-Authors: Liu Liu, Xiaoming She, Lan Chen, Juejia Zhou, Yuta Sagae, Mikio IwamuraAbstract:This paper focuses on investigating appropriate management of Component Carriers(CCs) in Carrier aggregation( CA) system, which is identified as one of the most distinct features of 4G systems including Long Term Evolution- Advanced (LTE-A). An LTE-A user equipment (UE) is allowed to concurrently utilize multiple Carriers, which leads to scalable increase in user throughput. However, in certain circumstances, aggregating entire available Carriers for a UE is not meaningful due to probably low channel quality or high traffic load in some of the CCs. Therefore, how to make good use of multiple Carriers in real deployment scenarios is an important issue. Based on the analysis of resource allocation across multiple Carriers in Layer-2, two CC management methods in Layer- 3 are proposed. The proposed method is shown by simulation results to be effective in providing comparable user throughput with lower implementation complexity, as compared to solely ingenious resource allocation.
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Handover methods in Carrier aggregation environment
IET International Conference on Communication Technology and Application (ICCTA 2011), 2011Co-Authors: Liu Liu, Xiaoming She, Lan ChenAbstract:Carrier aggregation is one of important technologies to improve the performance of LTE-A. When Carrier aggregation is conducted, UE will have a set of serving cells (Component Carrier, CC), which introduces some new problems during handover decision process. By traditional handover method, channel condition of only one serving cell is considered, a proper set of serving cells can not be selected. In order to solve this problem, this paper proposes two handover methods considering the entire channel condition of multiple cells. Method 1 proposes to adjust handover margin according to difference between PCell and SCell in serving eNB; Method 2 proposes to make handover decision by equivalent channel condition of multiple cells in both serving eNB and neighboring eNB. Simulation results show that proposed methods provide higher cell edge throughput and a much smoother handover with almost same number of handovers.
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A throughput-optimized Component Carrier selection algorithm for LTE-advanced systems
IET International Conference on Communication Technology and Application (ICCTA 2011), 2011Co-Authors: Gao Songtao, Hui Tian, Lan Chen, Jianchi Zhu, Xiaoming SheAbstract:Carrier aggregation (CA) technology has emerged as a promising solution to provide up to 100MHz bandwidth in 3 GPP LTE-Advanced standards. An LTE-Advanced UE can work over scalable frequency bands but is limited to aggregate up to 5 Component Carriers (CCs) simultaneously. In this paper, it is focused on the CC selection algorithm to optimize the system throughput. First, two traditional CC selection methods named Random and Least Load CC selection are investigated, both of which can well balance the load across different CCs. However, through their assignment principles, it can be found that neither of them contributes to the system throughput improvement, which is also proved by the system-level simulation. To solve this problem, a throughput-optimized CC selection algorithm is derived in this paper. Simulation results demonstrate that the proposed strategy outperforms the traditional ones and the system throughput is dramatically improved.
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VTC Spring - Component Carrier Management for Carrier Aggregation in LTE-Advanced System
2011 IEEE 73rd Vehicular Technology Conference (VTC Spring), 2011Co-Authors: Liu Liu, Xiaoming She, Lan Chen, Juejia Zhou, Yuta Sagae, Mikio IwamuraAbstract:This paper focuses on investigating appropriate management of Component Carriers(CCs) in Carrier aggregation( CA) system, which is identified as one of the most distinct features of 4G systems including Long Term Evolution- Advanced (LTE-A). An LTE-A user equipment (UE) is allowed to concurrently utilize multiple Carriers, which leads to scalable increase in user throughput. However, in certain circumstances, aggregating entire available Carriers for a UE is not meaningful due to probably low channel quality or high traffic load in some of the CCs. Therefore, how to make good use of multiple Carriers in real deployment scenarios is an important issue. Based on the analysis of resource allocation across multiple Carriers in Layer-2, two CC management methods in Layer- 3 are proposed. The proposed method is shown by simulation results to be effective in providing comparable user throughput with lower implementation complexity, as compared to solely ingenious resource allocation.
Husnu S. Narman - One of the best experts on this subject based on the ideXlab platform.
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QSHINE - Primary Component Carrier Assignment in LTE-A
Lecture Notes of the Institute for Computer Sciences Social Informatics and Telecommunications Engineering, 2017Co-Authors: Husnu S. Narman, Mohammed AtiquzzamanAbstract:Bandwidth requirement for mobile data traffic is on the rise because of increasing number of mobile users. To answer the requirement, Carrier Aggregation is proposed. With Carrier Aggregation and MIMO, operators can provide up to 3 Gbps download speed. In Carrier Aggregation, several Component Carriers from multiple bands are assigned to users. The assigned Component Carriers are classified as Primary and Secondary Component Carriers. The Primary Component Carrier (PCC) is the main Carrier and only updated during the handover and cell reselection but Secondary Component Carriers (SCC) are auxiliary Carriers to boost data rates and can be activated/deactivated anytime. During the Carrier assignment operations, PCC reassignment can lead packet interruptions because reassignments of PCC to users can lead SCCs reassignment. Several methods have been proposed to increase the efficiency of the Carrier assignment operations. However, none of them shows the system performance if LTE-A can have a procedure which allows one of SCCs to handle the duties of PCC during the PCC reassignment to eliminate packet transfer interruption. Therefore, we have used four different Carrier assignment methods to investigate the performance of LTE-A with and without the procedure. Results show that distinct Carrier assignment methods are differently affected by the procedure. Our results and analysis will help service providers and researchers to develop efficient Carrier assignment methods.
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Joint and selective periodic Component Carrier assignment for LTE-A
Computer Networks, 2016Co-Authors: Husnu S. Narman, Mohammed Atiquzzaman, Mehdi Rahmani-andebili, Haiying ShenAbstract:The bandwidth demand for mobile Internet access is significantly increased with the number of mobile users. Carrier aggregation has been proposed to answer this demand in mobile networks. In Carrier aggregation, the best available one or more Component Carriers of each band are assigned to each user to provide efficient services. Several works have been reported in the literature on mandatory and periodic Component Carrier assignment methods. Although the former works, especially periodic Component Carrier assignment methods, have significantly improved the performance of LTE-A systems, many limitations still exist. One limitation of previous works is that data transfer is interrupted during periodic Component Carrier assignment operations thus, decrease the performance of the system. Therefore, in this paper, selective periodic Component Carrier assignment technique, which allows continuous data transfer during periodic Carrier assignment operations, is proposed and followed by integration of selective technique into four Component Carrier assignment methods: Least Load, Least Load Rate, Random, and Channel Quality to observe the performance improvements. Results indicate that the proposed selective technique increases the throughput ratio up to 18% and decreases average delay up to 50%. Our analysis and proposed technique will assist service providers to build efficient periodic Component Carrier assignment methods to improve the performance of the system by reducing delay and increasing throughput ratio.
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GLOBECOM - Selective Periodic Component Carrier Assignment Technique in LTE and LTE-A Systems
2015 IEEE Global Communications Conference (GLOBECOM), 2015Co-Authors: Husnu S. Narman, Mohammed AtiquzzamanAbstract:Internet usage over mobile devices is on the rise. The bandwidth demand for mobile Internet access is also increasing with the number of mobile users. To answer users' demand, Carrier aggregation is proposed in LTE-A system. In Carrier aggregation, the best available one or more Component Carriers of each band are assigned to each user to provide efficient services. Several works have been reported in the literature on mandatory and periodic Component Carrier assignment methods. Although the previous works, especially periodic Component Carrier assignment methods, have significantly improved performance of LTE and LTE- A systems, many limitations still exist. One limitation of previous works is that data transfer is interrupted during periodic Component Carrier assignment operation which can decrease performance of the system. Therefore, in this paper, selective periodic Component Carrier assignment technique which allows continues data transfer during periodic Carrier assignment operations is proposed. Results show that the proposed technique increases throughput rate up to 25% and decreases average delay time up to 35%.
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GLOBECOM - Analysis of Joint and Partial Component Carrier Assignment Techniques in LTE and LTE-A
2015 IEEE Global Communications Conference (GLOBECOM), 2015Co-Authors: Husnu S. Narman, Mohammed AtiquzzamanAbstract:Large multimedia files are accessed by a high number of mobile users over the Internet. Therefore, the bandwidth demand for mobile Internet access is increasing exponentially. To answer users' demand, Carrier aggregation is proposed in LTE-A. In Carrier aggregation, the best available one or more Component Carriers of each band are assigned as primary and secondary Component Carriers to each user for efficient services. The previous works have significantly improved the performance of LTE-A by using efficient Component Carrier assignment methods. The previous works, however, have two limitations. First, they have not investigated which of joint or partial secondary Component Carrier assignment techniques shows better performance. Second, overall system performance is analyzed in order to evaluate methods by ignoring system behavior such as packet drops and delay metrics during Carrier reassignment operations. Therefore, in this paper, firstly, packet drops and delay which are experienced by users during the Carrier reassignment process are investigated. Secondly, joint and partial secondary Component Carrier assignment techniques are compared. Results show that the partial Carrier assignment technique increases efficiency of resource usage, throughput rate up to 15% and decreases average delay time up to 12%.