Pub Date : 2017-09-01DOI: 10.1109/VTCFall.2017.8288145
Y. Masuda, H. Shinoda, A. Noda
This paper proposes a method to determine a physical layer (PHY) parameter that minimizes energy-per-bit rate (EBR) in a two-dimensional communication (2DC) environment. EBR is the power consumption used for 1- bit transmission/reception. 2DC uses a sheet-like waveguide medium, which guides the micro-wave along the sheet. In our previous work, the possibility of energy- efficient data transmission by using TransferJet devices in 2DC environment was reported. The reported maximum transmission rate was 71.1 Mbps with a power consumption of 118 mW. The EBR was two orders of magnitude lower than that of ZigBee despite the same power consumption. However, the data rate significantly degraded at some transceiver positions depending on the delay spread of the 2DC channel. The decrease of the transmission rate was caused by a mismatch between the PHY parameter of the communication system and the characteristics of the communication environment. This pa-per presents a method to determine an optimum PHY parameter for minimizing EBR. The experimental results demonstrate the feasibility of the energy-efficient data transmission in 2DC environments.
{"title":"Physical Layer Design of Energy-Efficient Data Transmission in 2D Communication Environments","authors":"Y. Masuda, H. Shinoda, A. Noda","doi":"10.1109/VTCFall.2017.8288145","DOIUrl":"https://doi.org/10.1109/VTCFall.2017.8288145","url":null,"abstract":"This paper proposes a method to determine a physical layer (PHY) parameter that minimizes energy-per-bit rate (EBR) in a two-dimensional communication (2DC) environment. EBR is the power consumption used for 1- bit transmission/reception. 2DC uses a sheet-like waveguide medium, which guides the micro-wave along the sheet. In our previous work, the possibility of energy- efficient data transmission by using TransferJet devices in 2DC environment was reported. The reported maximum transmission rate was 71.1 Mbps with a power consumption of 118 mW. The EBR was two orders of magnitude lower than that of ZigBee despite the same power consumption. However, the data rate significantly degraded at some transceiver positions depending on the delay spread of the 2DC channel. The decrease of the transmission rate was caused by a mismatch between the PHY parameter of the communication system and the characteristics of the communication environment. This pa-per presents a method to determine an optimum PHY parameter for minimizing EBR. The experimental results demonstrate the feasibility of the energy-efficient data transmission in 2DC environments.","PeriodicalId":375803,"journal":{"name":"2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121491781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-09-01DOI: 10.1109/VTCFall.2017.8288012
Ricardo Candeias, João Guerreiro, R. Dinis, P. Montezuma
Massive multiple input, multiple output (MIMO) schemes have been considered to support the physical layer of 5G systems and its combination with single-carrier with frequency-domain equalization (SC-FDE) schemes is particularly interesting for the uplink. However, the receiver complexity increases with the number of antennas, and it is important to have low complexity massive MIMO schemes. In this paper we consider the receiver design for the uplink of massive MIMO schemes where SC-FDE techniques are employed by the user terminals. To achieve this, we empoly low resolution analog-to- digital converters (ADCs) at each receive branch of the BS, combined with low complexity FDE techniques. It is shown that, although the nonlinear distortion levels inherent to the use of low resolution ADCs can be very high, we can have excellent performance, even with low complexity FDE receivers, provided that the number of receiver antennas is higher than the number of user terminals.
{"title":"Performance Evaluation of Low-Complexity FDE Receivers for Massive MIMO Schemes with 1-Bit ADCs","authors":"Ricardo Candeias, João Guerreiro, R. Dinis, P. Montezuma","doi":"10.1109/VTCFall.2017.8288012","DOIUrl":"https://doi.org/10.1109/VTCFall.2017.8288012","url":null,"abstract":"Massive multiple input, multiple output (MIMO) schemes have been considered to support the physical layer of 5G systems and its combination with single-carrier with frequency-domain equalization (SC-FDE) schemes is particularly interesting for the uplink. However, the receiver complexity increases with the number of antennas, and it is important to have low complexity massive MIMO schemes. In this paper we consider the receiver design for the uplink of massive MIMO schemes where SC-FDE techniques are employed by the user terminals. To achieve this, we empoly low resolution analog-to- digital converters (ADCs) at each receive branch of the BS, combined with low complexity FDE techniques. It is shown that, although the nonlinear distortion levels inherent to the use of low resolution ADCs can be very high, we can have excellent performance, even with low complexity FDE receivers, provided that the number of receiver antennas is higher than the number of user terminals.","PeriodicalId":375803,"journal":{"name":"2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121494064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-09-01DOI: 10.1109/VTCFall.2017.8288186
H. Hamouda, M. O. Kabaou, M. Bouhlel
IEEE 802.16 OFDMA wireless network is expected to be the dominant system used by operators in these last decade due to its promising solutions for providing high data rate. However, IEEE 802.16 packet scheduling and resources assigning among Mobile Stations (MSs) is still the main challenge due to unfairness and low performance which occur when allocating resources to MSs. Furthermore, MaxSNR scheduler is often recognized by the scientific community as the most effective in OFDMA wireless networks. Thanks to its opportunistic operation, it takes into account changes in the states of links, maximizes system throughput and so can accommodate a very large number of users in the network. However, this does not come cheap: MSs far from the access point are systematically penalized compared to closer ones; this is because of their little favorable transmission conditions (caused by path loss). In this paper, we propose an improvement to MaxSNR scheduler called Dynamic and Fair MaxSNR (DFMaxSNR). The DFMaxSNR consists not only of exploiting the concept of opportunistic scheduler in order to maximize system throughput, but also of correcting the unequal spectral efficiencies induced by path loss attenuations in order to minimize the delay and the packet loss rate for real time applications. Performance evaluation shows that this well-balanced resource allocation scheme outperforms other existing schedulers (MaxSNR, PF and RR) and demonstrate that choosing between high system capacity and high fairness is not required.
{"title":"A Cross-Layer Downlink Scheduling Scheme for Balancing QoS in IEEE 802.16 Broadband Wireless Access Systems","authors":"H. Hamouda, M. O. Kabaou, M. Bouhlel","doi":"10.1109/VTCFall.2017.8288186","DOIUrl":"https://doi.org/10.1109/VTCFall.2017.8288186","url":null,"abstract":"IEEE 802.16 OFDMA wireless network is expected to be the dominant system used by operators in these last decade due to its promising solutions for providing high data rate. However, IEEE 802.16 packet scheduling and resources assigning among Mobile Stations (MSs) is still the main challenge due to unfairness and low performance which occur when allocating resources to MSs. Furthermore, MaxSNR scheduler is often recognized by the scientific community as the most effective in OFDMA wireless networks. Thanks to its opportunistic operation, it takes into account changes in the states of links, maximizes system throughput and so can accommodate a very large number of users in the network. However, this does not come cheap: MSs far from the access point are systematically penalized compared to closer ones; this is because of their little favorable transmission conditions (caused by path loss). In this paper, we propose an improvement to MaxSNR scheduler called Dynamic and Fair MaxSNR (DFMaxSNR). The DFMaxSNR consists not only of exploiting the concept of opportunistic scheduler in order to maximize system throughput, but also of correcting the unequal spectral efficiencies induced by path loss attenuations in order to minimize the delay and the packet loss rate for real time applications. Performance evaluation shows that this well-balanced resource allocation scheme outperforms other existing schedulers (MaxSNR, PF and RR) and demonstrate that choosing between high system capacity and high fairness is not required.","PeriodicalId":375803,"journal":{"name":"2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121672727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-09-01DOI: 10.1109/VTCFall.2017.8288182
Zhonghu Xu, Kai Xing
Motivated by the observation that there is an increasingly aggravated conflict between the expanding sensor capabilities for sensing service/content and the limited network performance in wireless multimedia sensor networks (usually caused by cost, congestion, packet loss, resource limit, etc.), we provide a bottom-up approach to speedup the network by leveraging a group of nodes' (fog nodes) capacity and piling them up as a considerable amount for fastlane service. Specifically, our approach is based on the following designs: 1. A novel way for capacity cumulation based on temporal and spatial diversity of network content/service access: there always exists redundant resources and ability among other sensors in time and spatial domain that can be piled up as a considerable amount, though each piece may be really small; 2. Content/Service Recoding, it is often the case that some content/service access require various resources (e.g., bandwidth) at a sensor who cannot meet. we divide content/service into ultimate small slices; 3. fog computing based network virtualization and distributed coordination enable the fog nodes be efficiently connected, and the recoded fragmented content/service can pass through the formed virtual network. Based on theoretical analysis, it is shown that our approach could achieve global optimal request/resource allocation in a distributed manner and maximize the network service ability. The extensive experimental study conducted in various scenarios (TCP, UDP, and both, etc.) also shows that the proposed approach could adapt to different networking environments and achieve significant improvement of quality of service (QoS) and experience (QoE). Furthermore, our approach is shown to be able to achieve linear speedup as the number of fog nodes increases.
{"title":"Coordinationless Coordinated Fastlane Network Service in Wireless Multimedia Sensor Networks","authors":"Zhonghu Xu, Kai Xing","doi":"10.1109/VTCFall.2017.8288182","DOIUrl":"https://doi.org/10.1109/VTCFall.2017.8288182","url":null,"abstract":"Motivated by the observation that there is an increasingly aggravated conflict between the expanding sensor capabilities for sensing service/content and the limited network performance in wireless multimedia sensor networks (usually caused by cost, congestion, packet loss, resource limit, etc.), we provide a bottom-up approach to speedup the network by leveraging a group of nodes' (fog nodes) capacity and piling them up as a considerable amount for fastlane service. Specifically, our approach is based on the following designs: 1. A novel way for capacity cumulation based on temporal and spatial diversity of network content/service access: there always exists redundant resources and ability among other sensors in time and spatial domain that can be piled up as a considerable amount, though each piece may be really small; 2. Content/Service Recoding, it is often the case that some content/service access require various resources (e.g., bandwidth) at a sensor who cannot meet. we divide content/service into ultimate small slices; 3. fog computing based network virtualization and distributed coordination enable the fog nodes be efficiently connected, and the recoded fragmented content/service can pass through the formed virtual network. Based on theoretical analysis, it is shown that our approach could achieve global optimal request/resource allocation in a distributed manner and maximize the network service ability. The extensive experimental study conducted in various scenarios (TCP, UDP, and both, etc.) also shows that the proposed approach could adapt to different networking environments and achieve significant improvement of quality of service (QoS) and experience (QoE). Furthermore, our approach is shown to be able to achieve linear speedup as the number of fog nodes increases.","PeriodicalId":375803,"journal":{"name":"2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)","volume":" 27","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113952907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-09-01DOI: 10.1109/VTCFall.2017.8288109
Toni Levanen, J. Kaikkonen, Sari Nielsen, K. Pajukoski, M. Renfors, M. Valkama
For the 5G new radio physical layer the CP-OFDM waveform has been chosen as the baseline for communications below 40 GHz. The requirement for multicarrier waveforms used for uplink is to achieve similar coverage as achieved by SC-FDMA in LTE uplink. In this paper, multiple candidate waveforms with enhanced CP-OFDM processing proposed for 5G incorporating realistic 3GPP compliant power amplifier model and peak clipping are evaluated in uplink transmission, and compared against SC-FDMA in terms of maximum average power amplifier output power and coded block error rate. It is shown that multicarrier waveforms have minor disadvantage in single-PRB transmission, but as the allocation size increases to encounter frequency selective fading the multicarrier waveforms provide similar or even improved link budget compared to SC-FDMA uplink. This implies that given the expected cell edge throughput requirements for 5G mobile broadband services and expected power amplifier development, enhanced CP-OFDM waveforms can achieve the uplink coverage requirement.
{"title":"5G New Radio UL Coverage with Peak Clipping","authors":"Toni Levanen, J. Kaikkonen, Sari Nielsen, K. Pajukoski, M. Renfors, M. Valkama","doi":"10.1109/VTCFall.2017.8288109","DOIUrl":"https://doi.org/10.1109/VTCFall.2017.8288109","url":null,"abstract":"For the 5G new radio physical layer the CP-OFDM waveform has been chosen as the baseline for communications below 40 GHz. The requirement for multicarrier waveforms used for uplink is to achieve similar coverage as achieved by SC-FDMA in LTE uplink. In this paper, multiple candidate waveforms with enhanced CP-OFDM processing proposed for 5G incorporating realistic 3GPP compliant power amplifier model and peak clipping are evaluated in uplink transmission, and compared against SC-FDMA in terms of maximum average power amplifier output power and coded block error rate. It is shown that multicarrier waveforms have minor disadvantage in single-PRB transmission, but as the allocation size increases to encounter frequency selective fading the multicarrier waveforms provide similar or even improved link budget compared to SC-FDMA uplink. This implies that given the expected cell edge throughput requirements for 5G mobile broadband services and expected power amplifier development, enhanced CP-OFDM waveforms can achieve the uplink coverage requirement.","PeriodicalId":375803,"journal":{"name":"2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)","volume":"29 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113988327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-09-01DOI: 10.1109/VTCFall.2017.8288196
W. Ali, Junyuan Wang, Huiling Zhu, Jiangzhou Wang
High-speed trains have become one of the most leading transportation means, where each year the manufacture companies reach a new speed record. This progressive speed records increase the handover (HO) rate which makes it very difficult for high speed railway (HSR) mobile communication to sustain a reliable communication link. Utilizing distributed antenna systems (DASs) along with the two-hop architecture, this paper analyzes the conventional handover scheme based on this architecture and proposes a faster HO strategy. The proposed scheme reduces the HO latency and failure probability which could greatly improve the end-users quality of services (QoS). The analytical results show that the proposed scheme performs better than the conventional HO scheme.
{"title":"An Optimized Fast Handover Scheme Based on Distributed Antenna System for High-Speed Railway","authors":"W. Ali, Junyuan Wang, Huiling Zhu, Jiangzhou Wang","doi":"10.1109/VTCFall.2017.8288196","DOIUrl":"https://doi.org/10.1109/VTCFall.2017.8288196","url":null,"abstract":"High-speed trains have become one of the most leading transportation means, where each year the manufacture companies reach a new speed record. This progressive speed records increase the handover (HO) rate which makes it very difficult for high speed railway (HSR) mobile communication to sustain a reliable communication link. Utilizing distributed antenna systems (DASs) along with the two-hop architecture, this paper analyzes the conventional handover scheme based on this architecture and proposes a faster HO strategy. The proposed scheme reduces the HO latency and failure probability which could greatly improve the end-users quality of services (QoS). The analytical results show that the proposed scheme performs better than the conventional HO scheme.","PeriodicalId":375803,"journal":{"name":"2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124479905","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In non-orthogonal multiple access (NOMA), signals of different users are independently encoded and modulated, then superposed in the power domain before transmission. The choice of a suitable combination of power allocation factor (PAF) and transmit constellations is hence critical to enhance the system performance. The aim of this work is to develop a tool for adaptively selecting a suitable PAF and transmit constellations for an enhanced system data rate, given some individual user bit error rate (BER) constraints that need to be jointly considered. For this purpose, analytical bit error probability (BEP) expressions are derived and evaluated. This is the first attempt to analytically evaluate the BER in NOMA systems. The expressions are evaluated in order to propose the best combination of MCS and PAF. The trade-offs involved in selecting a certain combination of transmit constellations and PAF are also investigated. Moreover, numerical evaluations prove that the attainable BEP at the near user is affected by that of the far user. Look-up tables of suitable combinations of PAF and transmit constellations are derived using the BEP expressions, with a focus on enhancing the system data rate for some given BER constraints at both users.
{"title":"On the Power Allocation and Constellation Selection in Downlink NOMA","authors":"Estela Carmona Cejudo, Huiling Zhu, Osama Alluhaibi","doi":"10.1109/VTCFall.2017.8288077","DOIUrl":"https://doi.org/10.1109/VTCFall.2017.8288077","url":null,"abstract":"In non-orthogonal multiple access (NOMA), signals of different users are independently encoded and modulated, then superposed in the power domain before transmission. The choice of a suitable combination of power allocation factor (PAF) and transmit constellations is hence critical to enhance the system performance. The aim of this work is to develop a tool for adaptively selecting a suitable PAF and transmit constellations for an enhanced system data rate, given some individual user bit error rate (BER) constraints that need to be jointly considered. For this purpose, analytical bit error probability (BEP) expressions are derived and evaluated. This is the first attempt to analytically evaluate the BER in NOMA systems. The expressions are evaluated in order to propose the best combination of MCS and PAF. The trade-offs involved in selecting a certain combination of transmit constellations and PAF are also investigated. Moreover, numerical evaluations prove that the attainable BEP at the near user is affected by that of the far user. Look-up tables of suitable combinations of PAF and transmit constellations are derived using the BEP expressions, with a focus on enhancing the system data rate for some given BER constraints at both users.","PeriodicalId":375803,"journal":{"name":"2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124512594","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-09-01DOI: 10.1109/VTCFall.2017.8288345
Bichai Wang, L. Dai, Xiqi Gao, L. Hanzo
The recent concept of beamspace multiple-input multiple-output (MIMO) is capable of significantly reducing the number of radio-frequency (RF) chains required by millimeter-wave (mmWave) massive MIMO systems. However, the fundamental limit of the existing beamspace MIMO is that, the number of supported users cannot be higher than the number of RF chains using the same time-frequency resources. To break this limit, beamspace MIMO is integrated with non-orthogonal multiple access (NOMA) in the proposed MIMO-NOMA system in this paper, where the number of supported users can be higher than the number of RF chains. To reduce the inter-beam interference, a transmit precoding (TPC) scheme based on the principle of zero-forcing (ZF) is designed. Furthermore, a dynamic power allocation scheme is proposed for maximizing the achievable sum rate. Moreover, a low-complexity iterative optimization algorithm is conceived for dynamic power allocation. Simulation results show that the proposed beamspace MIMO-NOMA achieves a higher spectrum and energy efficiency than the existing beamspace MIMO for mmWave communications.
{"title":"Beamspace MIMO-NOMA for Millimeter-Wave Communications Using Lens Antenna Arrays","authors":"Bichai Wang, L. Dai, Xiqi Gao, L. Hanzo","doi":"10.1109/VTCFall.2017.8288345","DOIUrl":"https://doi.org/10.1109/VTCFall.2017.8288345","url":null,"abstract":"The recent concept of beamspace multiple-input multiple-output (MIMO) is capable of significantly reducing the number of radio-frequency (RF) chains required by millimeter-wave (mmWave) massive MIMO systems. However, the fundamental limit of the existing beamspace MIMO is that, the number of supported users cannot be higher than the number of RF chains using the same time-frequency resources. To break this limit, beamspace MIMO is integrated with non-orthogonal multiple access (NOMA) in the proposed MIMO-NOMA system in this paper, where the number of supported users can be higher than the number of RF chains. To reduce the inter-beam interference, a transmit precoding (TPC) scheme based on the principle of zero-forcing (ZF) is designed. Furthermore, a dynamic power allocation scheme is proposed for maximizing the achievable sum rate. Moreover, a low-complexity iterative optimization algorithm is conceived for dynamic power allocation. Simulation results show that the proposed beamspace MIMO-NOMA achieves a higher spectrum and energy efficiency than the existing beamspace MIMO for mmWave communications.","PeriodicalId":375803,"journal":{"name":"2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124020032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-09-01DOI: 10.1109/VTCFall.2017.8288195
R. Harwahyu, R. Cheng, Chia-Hung Wei
Narrowband Internet of Things (NB-IoT) is a new access technology introduced by 3GPP. It aims to support massive machine-type communications services in wide area. This work presents an analytical model to estimate access success probability and average access delay of random access (RA) procedure for three coverage enhancement (CE) levels in NB-IoT. The behavior of RA procedure in NB-IoT is analyzed and accuracy of the analysis is verified by computer simulations.
{"title":"Investigating the Performance of the Random Access Channel in NB-IoT","authors":"R. Harwahyu, R. Cheng, Chia-Hung Wei","doi":"10.1109/VTCFall.2017.8288195","DOIUrl":"https://doi.org/10.1109/VTCFall.2017.8288195","url":null,"abstract":"Narrowband Internet of Things (NB-IoT) is a new access technology introduced by 3GPP. It aims to support massive machine-type communications services in wide area. This work presents an analytical model to estimate access success probability and average access delay of random access (RA) procedure for three coverage enhancement (CE) levels in NB-IoT. The behavior of RA procedure in NB-IoT is analyzed and accuracy of the analysis is verified by computer simulations.","PeriodicalId":375803,"journal":{"name":"2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127749010","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-09-01DOI: 10.1109/VTCFall.2017.8288055
Mohamad Zalghout, J. Hélard, M. Crussiére, Samih Abdul-Nabi, Ayman Khalil
Wireless heterogeneous networks are usually characterized by the integration of different types of radio access technologies (RATs) to enhance system capacity and meet user requirements. In this context, we formulate a user association and downlink resource allocation optimization problem to maximize the overall user-centric profit in the system. The context-awareness is based on the user preferences, the data rate requested by each user equipment (UE), and the RAT characteristics and constraints. The user preference is based on a normalized weighted profit function that considers both the received signal quality and the power consumption at UEs. To approximate the formulated optimization problem, a greedy heuristic algorithm with polynomial-time complexity is proposed. It is shown through persuasive simulations that the proposed heuristic algorithm, when compared to the trivial profit-function-based solution, enhances the average user satisfaction in the system and lowers the percentage of blocked data rate. In fact, the performance of the proposed heuristic algorithm comes close to the optimal solution while requesting a lower number of handovers (HOs).
{"title":"A Greedy Heuristic Algorithm for Context-Aware User Association and Resource Allocation in Heterogeneous Wireless Networks","authors":"Mohamad Zalghout, J. Hélard, M. Crussiére, Samih Abdul-Nabi, Ayman Khalil","doi":"10.1109/VTCFall.2017.8288055","DOIUrl":"https://doi.org/10.1109/VTCFall.2017.8288055","url":null,"abstract":"Wireless heterogeneous networks are usually characterized by the integration of different types of radio access technologies (RATs) to enhance system capacity and meet user requirements. In this context, we formulate a user association and downlink resource allocation optimization problem to maximize the overall user-centric profit in the system. The context-awareness is based on the user preferences, the data rate requested by each user equipment (UE), and the RAT characteristics and constraints. The user preference is based on a normalized weighted profit function that considers both the received signal quality and the power consumption at UEs. To approximate the formulated optimization problem, a greedy heuristic algorithm with polynomial-time complexity is proposed. It is shown through persuasive simulations that the proposed heuristic algorithm, when compared to the trivial profit-function-based solution, enhances the average user satisfaction in the system and lowers the percentage of blocked data rate. In fact, the performance of the proposed heuristic algorithm comes close to the optimal solution while requesting a lower number of handovers (HOs).","PeriodicalId":375803,"journal":{"name":"2017 IEEE 86th Vehicular Technology Conference (VTC-Fall)","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127762826","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：