The Experts below are selected from a list of 4026 Experts worldwide ranked by ideXlab platform
Jie Zhang - One of the best experts on this subject based on the ideXlab platform.
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Coverage Analysis of Reduced Power Subframes Applied in Heterogeneous Networks With Subframe Misalignment Interference
IEEE Wireless Communications Letters, 2018Co-Authors: Haonan Hu, Baoling Zhang, Qi Hong, Jie ZhangAbstract:In heterogeneous networks (HetNets), to reduce the interference to users in cell range expansion (CRE) areas of small cells, reduced power Subframes (RPSs) are used by macro base stations (BSs) to serve their center region users. CRE users can receive full power Subframes (FPSs) from small-cell BSs in the same time slots as RPSs. However, it is difficult to maintain strict subframe alignment (SA) between neighboring cells. Subframe misalignment (SM) between RPSs and FPSs transmitted by neighboring macro BSs and small-cell BSs may degrade the coverage performance for macrocell center and small-cell CRE users. With existing time synchronization techniques used in HetNets, the SM offsets are actually upper-bounded. In this letter, we propose a novel SM model for a two-tier HetNet adopting RPSs with SM offsets restricted within a subframe duration, and analyze the coverage probability under the effects of RPSs and SM based on stochastic geometry. The results show that the strict SA requirement can be relaxed by up to 20% of subframe duration with below 5% coverage loss.
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Modelling and Analysis of Reduced Power Subframes in Two-Tier Femto HetNets
2016 IEEE 83rd Vehicular Technology Conference (VTC Spring), 2016Co-Authors: Haonan Hu, Jie Zhang, Jialai Weng, Jiliang Zhang, Yang WangAbstract:The Reduced Power Subframes (RPS) are encouraged to be applied in the LTE-Advanced Heterogeneous Networks (HetNets), to reduce the capacity loss caused by the Almost Blank Subframes (ABS). However, the RPS are supposed to be used in the macrocells only. In fact, the RPS can also be used in femtocells to mitigate the interference that the macrocell edge users suffers, but its performance is not investigated yet. In this paper, we introduce the RPS both in the macrocells and the femtocells. The results of the Signal to Interference Ratio (SIR) coverage probability under the stochastic geometry framework are derived in a closed-form which is verified through Monte Carlo simulation. Based on these results, the macrocell edge users' SIR coverage and the average rate coverage of the network (the average fraction of users achieving a target rate) are analysed numerically. Our proposed scheme enhanced both the SIR of the macro edge users and the average rate coverage probabilities.
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VTC Spring - Modelling and Analysis of Reduced Power Subframes in Two-Tier Femto HetNets
2016 IEEE 83rd Vehicular Technology Conference (VTC Spring), 2016Co-Authors: Haonan Hu, Jie Zhang, Jialai Weng, Jiliang Zhang, Yang WangAbstract:The Reduced Power Subframes (RPS) are encouraged to be applied in the LTE-Advanced Heterogeneous Networks (HetNets), to reduce the capacity loss caused by the Almost Blank Subframes (ABS). However, the RPS are supposed to be used in the macrocells only. In fact, the RPS can also be used in femtocells to mitigate the interference that the macrocell edge users suffers, but its performance is not investigated yet. In this paper, we introduce the RPS both in the macrocells and the femtocells. The results of the Signal to Interference Ratio (SIR) coverage probability under the stochastic geometry framework are derived in a closed-form which is verified through Monte Carlo simulation. Based on these results, the macrocell edge users' SIR coverage and the average rate coverage of the network (the average fraction of users achieving a target rate) are analysed numerically. Our proposed scheme enhanced both the SIR of the macro edge users and the average rate coverage probabilities.
Haonan Hu - One of the best experts on this subject based on the ideXlab platform.
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Coverage Analysis of Reduced Power Subframes Applied in Heterogeneous Networks With Subframe Misalignment Interference
IEEE Wireless Communications Letters, 2018Co-Authors: Haonan Hu, Baoling Zhang, Qi Hong, Jie ZhangAbstract:In heterogeneous networks (HetNets), to reduce the interference to users in cell range expansion (CRE) areas of small cells, reduced power Subframes (RPSs) are used by macro base stations (BSs) to serve their center region users. CRE users can receive full power Subframes (FPSs) from small-cell BSs in the same time slots as RPSs. However, it is difficult to maintain strict subframe alignment (SA) between neighboring cells. Subframe misalignment (SM) between RPSs and FPSs transmitted by neighboring macro BSs and small-cell BSs may degrade the coverage performance for macrocell center and small-cell CRE users. With existing time synchronization techniques used in HetNets, the SM offsets are actually upper-bounded. In this letter, we propose a novel SM model for a two-tier HetNet adopting RPSs with SM offsets restricted within a subframe duration, and analyze the coverage probability under the effects of RPSs and SM based on stochastic geometry. The results show that the strict SA requirement can be relaxed by up to 20% of subframe duration with below 5% coverage loss.
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Modelling and Analysis of Reduced Power Subframes in Two-Tier Femto HetNets
2016 IEEE 83rd Vehicular Technology Conference (VTC Spring), 2016Co-Authors: Haonan Hu, Jie Zhang, Jialai Weng, Jiliang Zhang, Yang WangAbstract:The Reduced Power Subframes (RPS) are encouraged to be applied in the LTE-Advanced Heterogeneous Networks (HetNets), to reduce the capacity loss caused by the Almost Blank Subframes (ABS). However, the RPS are supposed to be used in the macrocells only. In fact, the RPS can also be used in femtocells to mitigate the interference that the macrocell edge users suffers, but its performance is not investigated yet. In this paper, we introduce the RPS both in the macrocells and the femtocells. The results of the Signal to Interference Ratio (SIR) coverage probability under the stochastic geometry framework are derived in a closed-form which is verified through Monte Carlo simulation. Based on these results, the macrocell edge users' SIR coverage and the average rate coverage of the network (the average fraction of users achieving a target rate) are analysed numerically. Our proposed scheme enhanced both the SIR of the macro edge users and the average rate coverage probabilities.
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VTC Spring - Modelling and Analysis of Reduced Power Subframes in Two-Tier Femto HetNets
2016 IEEE 83rd Vehicular Technology Conference (VTC Spring), 2016Co-Authors: Haonan Hu, Jie Zhang, Jialai Weng, Jiliang Zhang, Yang WangAbstract:The Reduced Power Subframes (RPS) are encouraged to be applied in the LTE-Advanced Heterogeneous Networks (HetNets), to reduce the capacity loss caused by the Almost Blank Subframes (ABS). However, the RPS are supposed to be used in the macrocells only. In fact, the RPS can also be used in femtocells to mitigate the interference that the macrocell edge users suffers, but its performance is not investigated yet. In this paper, we introduce the RPS both in the macrocells and the femtocells. The results of the Signal to Interference Ratio (SIR) coverage probability under the stochastic geometry framework are derived in a closed-form which is verified through Monte Carlo simulation. Based on these results, the macrocell edge users' SIR coverage and the average rate coverage of the network (the average fraction of users achieving a target rate) are analysed numerically. Our proposed scheme enhanced both the SIR of the macro edge users and the average rate coverage probabilities.
Wen Chen - One of the best experts on this subject based on the ideXlab platform.
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On Dynamic Time-Division-Duplex Transmissions for Small-Cell Networks
IEEE Transactions on Vehicular Technology, 2016Co-Authors: Ming Ding, Ruiqi Xue, David López-pérez, Athanasios V. Vasilakos, Wen ChenAbstract:Motivated by the promising benefits of dynamic time division duplex (TDD), in this paper, we use a unified framework to investigate both the technical issues of applying dynamic TDD in homogeneous small-cell networks (HomSCNs) and the feasibility of introducing dynamic TDD into heterogeneous networks (HetNets). First, HomSCNs are analyzed, and a small-cell base-station (BS) scheduler that dynamically and independently schedules downlink (DL) and uplink (UL) Subframes is presented, such that load balancing between the DL and UL traffic can be achieved. Moreover, the effectiveness of various interlink interference mitigation (ILIM) schemes and their combinations is systematically investigated and compared. Moreover, the interesting possibility of partial interference cancelation (IC) is also explored. Second, based on the proposed schemes, the joint operation of dynamic TDD together with cell range expansion (CRE) and almost blank subframe (ABS) in HetNets is studied. In this regard, scheduling polices in small cells and an algorithm to derive the appropriate macrocell traffic offload and ABS duty cycle under dynamic TDD operation are proposed. Moreover, the full IC and the partial IC schemes are investigated for dynamic TDD in HetNets. The user-equipment (UE) packet throughput performance of the proposed/discussed schemes is benchmarked using system-level simulations.
Yang Wang - One of the best experts on this subject based on the ideXlab platform.
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Modelling and Analysis of Reduced Power Subframes in Two-Tier Femto HetNets
2016 IEEE 83rd Vehicular Technology Conference (VTC Spring), 2016Co-Authors: Haonan Hu, Jie Zhang, Jialai Weng, Jiliang Zhang, Yang WangAbstract:The Reduced Power Subframes (RPS) are encouraged to be applied in the LTE-Advanced Heterogeneous Networks (HetNets), to reduce the capacity loss caused by the Almost Blank Subframes (ABS). However, the RPS are supposed to be used in the macrocells only. In fact, the RPS can also be used in femtocells to mitigate the interference that the macrocell edge users suffers, but its performance is not investigated yet. In this paper, we introduce the RPS both in the macrocells and the femtocells. The results of the Signal to Interference Ratio (SIR) coverage probability under the stochastic geometry framework are derived in a closed-form which is verified through Monte Carlo simulation. Based on these results, the macrocell edge users' SIR coverage and the average rate coverage of the network (the average fraction of users achieving a target rate) are analysed numerically. Our proposed scheme enhanced both the SIR of the macro edge users and the average rate coverage probabilities.
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VTC Spring - Modelling and Analysis of Reduced Power Subframes in Two-Tier Femto HetNets
2016 IEEE 83rd Vehicular Technology Conference (VTC Spring), 2016Co-Authors: Haonan Hu, Jie Zhang, Jialai Weng, Jiliang Zhang, Yang WangAbstract:The Reduced Power Subframes (RPS) are encouraged to be applied in the LTE-Advanced Heterogeneous Networks (HetNets), to reduce the capacity loss caused by the Almost Blank Subframes (ABS). However, the RPS are supposed to be used in the macrocells only. In fact, the RPS can also be used in femtocells to mitigate the interference that the macrocell edge users suffers, but its performance is not investigated yet. In this paper, we introduce the RPS both in the macrocells and the femtocells. The results of the Signal to Interference Ratio (SIR) coverage probability under the stochastic geometry framework are derived in a closed-form which is verified through Monte Carlo simulation. Based on these results, the macrocell edge users' SIR coverage and the average rate coverage of the network (the average fraction of users achieving a target rate) are analysed numerically. Our proposed scheme enhanced both the SIR of the macro edge users and the average rate coverage probabilities.
Yen-ming Sheu - One of the best experts on this subject based on the ideXlab platform.
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A Go-back-N HARQ time bundling for Machine Type Communication devices in LTE TDD
2013 IEEE Wireless Communications and Networking Conference (WCNC), 2013Co-Authors: Shiann-tsong Sheu, Chih-cheng Yang, Yen-ming SheuAbstract:In LTE TDD, some configurations which assign more Subframes for Downlink (DL) are designed for heavy DL traffic. In such case, multiple HARQ ACK/NACKs for different DL Subframes shall be transmitted in a given Uplink (UL) subframe. This situation will become worse while the Machine Type Communication (MTC) User Equipments (UEs) come into the LTE network because the number of the MTC UEs is very large and with several particular features. Indeed, to efficiently reduce the UL overhead caused by control signalling, the time bundling is adopted to combine multiple HARQ ACK/NACKs into an ACK/NACK by AND operation. However, the time bundling increases the number of transmissions and also degrades the overall system throughput. In this paper, we propose the Go-back-N (GBN) time bundling to decrease the number of transmissions and to increase the system throughput by strategically mixing the transmitted Transport Blocks (TBs) and the new coming TBs controlled by the transmit window. The simulation results show that the GBN time bundling can significantly improve the efficiency of HARQ feedback operation in LTE TDD. In other words, the overall throughput performance and the number of transmissions are improved especially for a large number of MTC UEs in LTE TDD network.
