Pub Date : 2016-09-01DOI: 10.1109/VTCFall.2016.7881012
Xuanli Wu, Yujie Pei, F. Labeau, Wanjun Zhao
Relay technique is introduced in the Long Term Evolution Advanced (LTE-Advanced) system to extend the network coverage, improve the performance of cell-edge user equipments (UEs) and increase the fairness among different UEs. The combination of multiple-input-multiple-output (MIMO) and relay can further increase frequency efficiency and improve system performance. In this paper, based on the architecture of MIMO relay-enhanced TD-LTE-Advanced system, a fairness -aware resource allocation algorithm is proposed, and the resource allocation is divided into 3 phases: a frequency resource partition scheme is firstly proposed to realize the tradeoff between fairness among UEs served by various relay nodes (RNs) and system throughput; secondly, a backhaul resource allocation algorithm is presented to match the eNB to relay transmission with the relay to UE transmission with reduced feedback overhead; finally, a resource allocation algorithm from eNB and relay to UEs is given to maximize the proportional fairness so that user fairness can be guaranteed. Simulation results show that both system throughput and user fairness can be improved with limited feedback overhead, using the proposed algorithms.
在LTE-Advanced (Long - Term Evolution Advanced)系统中引入中继技术，以扩大网络覆盖范围，提高蜂窝边缘用户设备(ue)的性能，增加不同终端之间的公平性。多输入多输出(MIMO)与继电器的结合可以进一步提高频率效率，改善系统性能。本文基于MIMO中继增强型TD-LTE-Advanced系统的体系结构，提出了一种具有公平性意识的资源分配算法，并将资源分配分为3个阶段:首先提出了一种频率资源分配方案，以实现各中继节点(RNs)服务的终端之间的公平性与系统吞吐量之间的权衡;其次，提出了一种减少反馈开销的eNB到中继传输与中继到UE传输匹配的回程资源分配算法;最后，给出了一种从eNB和中继到ue的资源分配算法，以最大化比例公平性，保证用户公平性。仿真结果表明，该算法可以在有限的反馈开销下提高系统吞吐量和用户公平性。
{"title":"Fairness-Aware Resource Allocation in Relay-Enhanced TD-LTE-A Systems","authors":"Xuanli Wu, Yujie Pei, F. Labeau, Wanjun Zhao","doi":"10.1109/VTCFall.2016.7881012","DOIUrl":"https://doi.org/10.1109/VTCFall.2016.7881012","url":null,"abstract":"Relay technique is introduced in the Long Term Evolution Advanced (LTE-Advanced) system to extend the network coverage, improve the performance of cell-edge user equipments (UEs) and increase the fairness among different UEs. The combination of multiple-input-multiple-output (MIMO) and relay can further increase frequency efficiency and improve system performance. In this paper, based on the architecture of MIMO relay-enhanced TD-LTE-Advanced system, a fairness -aware resource allocation algorithm is proposed, and the resource allocation is divided into 3 phases: a frequency resource partition scheme is firstly proposed to realize the tradeoff between fairness among UEs served by various relay nodes (RNs) and system throughput; secondly, a backhaul resource allocation algorithm is presented to match the eNB to relay transmission with the relay to UE transmission with reduced feedback overhead; finally, a resource allocation algorithm from eNB and relay to UEs is given to maximize the proportional fairness so that user fairness can be guaranteed. Simulation results show that both system throughput and user fairness can be improved with limited feedback overhead, using the proposed algorithms.","PeriodicalId":6484,"journal":{"name":"2016 IEEE 84th Vehicular Technology Conference (VTC-Fall)","volume":"14 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81610062","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 : 2016-09-01DOI: 10.1109/VTCFall.2016.7881956
Yue Li, Mohammad Ghasemiahmadi, Lin X. Cai
With the rapid development of the Internet of Things (IoT), the new challenges brought by the MTC traffic imposed a great pressure to the traditional cellular networks. The new MTC features like small-data transmission, large number of devices and deep fading channels will lead to a significant spectrum efficiency degradation and thus affect the regular Human-to- Human (H2H) communications. In this paper, we proposed a semi-centralized controlled cooperative method to improve the MTC transmission efficiency in the cellular uplink, which is backward- compatible with current LTE/LTE-A protocol and easy for implementation. Two cooperative transmission schemes based on the Device-to-Device (D2D) communications were applied, which are the Random User-Equipment (UE) Relay scheme (RUR) and the Network Coding scheme (NC). The D2D interference was analyzed based on the stochastic geometry, and 2 layers of scheduling were also considered. Intensive simulations were conducted. From the simulation results, a significant gain was achieved by the proposed method especially for the small data traffic. Also, a comparison was made between the RUR and NC schemes, and the suitable scenarios for each scheme can be identified.
{"title":"Uplink Cooperative Transmission for Machine-Type Communication Traffic in Cellular System","authors":"Yue Li, Mohammad Ghasemiahmadi, Lin X. Cai","doi":"10.1109/VTCFall.2016.7881956","DOIUrl":"https://doi.org/10.1109/VTCFall.2016.7881956","url":null,"abstract":"With the rapid development of the Internet of Things (IoT), the new challenges brought by the MTC traffic imposed a great pressure to the traditional cellular networks. The new MTC features like small-data transmission, large number of devices and deep fading channels will lead to a significant spectrum efficiency degradation and thus affect the regular Human-to- Human (H2H) communications. In this paper, we proposed a semi-centralized controlled cooperative method to improve the MTC transmission efficiency in the cellular uplink, which is backward- compatible with current LTE/LTE-A protocol and easy for implementation. Two cooperative transmission schemes based on the Device-to-Device (D2D) communications were applied, which are the Random User-Equipment (UE) Relay scheme (RUR) and the Network Coding scheme (NC). The D2D interference was analyzed based on the stochastic geometry, and 2 layers of scheduling were also considered. Intensive simulations were conducted. From the simulation results, a significant gain was achieved by the proposed method especially for the small data traffic. Also, a comparison was made between the RUR and NC schemes, and the suitable scenarios for each scheme can be identified.","PeriodicalId":6484,"journal":{"name":"2016 IEEE 84th Vehicular Technology Conference (VTC-Fall)","volume":"14 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84556691","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 : 2016-09-01DOI: 10.1109/VTCFall.2016.7881584
Nargis Khan, J. Misic, V. Mišić
In this paper, we evaluate the impact of physical layer on the performance of the Control Channel (CCH) in a Vehicular Access Network (VANET). CCH is implemented as an overlay network over LTE physical random access channel (PRACH). Physical layer of the VM2M overlay uses dedicated Zadoff- Chu preambles while the medium access control (MAC) layer uses a carrier sense multiple access (CSMA/CA) mechanism. We study three deployment scenarios of VM2M overlay-based CCH and evaluate the performance tradeoffs between the VM2M and human to human (H2H) traffic, and show that the overlay is a feasible solution to implement the CCH in a VANET.
{"title":"Tradeoffs in PRACH Bandwidth Partitioning for VM2M Overlay Network in LTE","authors":"Nargis Khan, J. Misic, V. Mišić","doi":"10.1109/VTCFall.2016.7881584","DOIUrl":"https://doi.org/10.1109/VTCFall.2016.7881584","url":null,"abstract":"In this paper, we evaluate the impact of physical layer on the performance of the Control Channel (CCH) in a Vehicular Access Network (VANET). CCH is implemented as an overlay network over LTE physical random access channel (PRACH). Physical layer of the VM2M overlay uses dedicated Zadoff- Chu preambles while the medium access control (MAC) layer uses a carrier sense multiple access (CSMA/CA) mechanism. We study three deployment scenarios of VM2M overlay-based CCH and evaluate the performance tradeoffs between the VM2M and human to human (H2H) traffic, and show that the overlay is a feasible solution to implement the CCH in a VANET.","PeriodicalId":6484,"journal":{"name":"2016 IEEE 84th Vehicular Technology Conference (VTC-Fall)","volume":"12 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85651839","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 : 2016-09-01DOI: 10.1109/VTCFall.2016.7881021
M. A. Alim, Takashi Watanabe
Recent advancements in antenna design and signal processing have made it feasible to transmit and receive at the same time by using same carrier frequency, which is called in-band full-duplex (IBFD) wireless communications. Along with physical layer advancements, efficient medium access control (MAC) design is required to achieve optimum benefit from this latest technology. In this paper, a full-duplex MAC (FD-MAC) is proposed for a WLAN to support asymmetric length of traffic for uplink and downlink, which is named as Asym- MAC. The main feature of this MAC is that multiple users can transmit data to the access point (AP) during the transmission of a single downlink frame from AP. Moreover, there is no contention period and hence, there is no collision among the user terminals and AP for channel access. In Asym-MAC, AP always initiates the transmission. The performance of Asym-MAC is compared with the traditional half-duplex MAC (HD-MAC) and another proposed FD-MAC. Asym-MAC outperforms traditional HD-MAC by about 100% throughput gain. Moreover, this MAC shows higher throughput gain as compared to another existing FD-MAC and the throughput gain is about 67%. The results suggest that a significant throughput gain can be achieved by using this MAC, which can be used for future FD WLANs.
{"title":"Full Duplex Medium Access Control Protocol for Asymmetric Traffic","authors":"M. A. Alim, Takashi Watanabe","doi":"10.1109/VTCFall.2016.7881021","DOIUrl":"https://doi.org/10.1109/VTCFall.2016.7881021","url":null,"abstract":"Recent advancements in antenna design and signal processing have made it feasible to transmit and receive at the same time by using same carrier frequency, which is called in-band full-duplex (IBFD) wireless communications. Along with physical layer advancements, efficient medium access control (MAC) design is required to achieve optimum benefit from this latest technology. In this paper, a full-duplex MAC (FD-MAC) is proposed for a WLAN to support asymmetric length of traffic for uplink and downlink, which is named as Asym- MAC. The main feature of this MAC is that multiple users can transmit data to the access point (AP) during the transmission of a single downlink frame from AP. Moreover, there is no contention period and hence, there is no collision among the user terminals and AP for channel access. In Asym-MAC, AP always initiates the transmission. The performance of Asym-MAC is compared with the traditional half-duplex MAC (HD-MAC) and another proposed FD-MAC. Asym-MAC outperforms traditional HD-MAC by about 100% throughput gain. Moreover, this MAC shows higher throughput gain as compared to another existing FD-MAC and the throughput gain is about 67%. The results suggest that a significant throughput gain can be achieved by using this MAC, which can be used for future FD WLANs.","PeriodicalId":6484,"journal":{"name":"2016 IEEE 84th Vehicular Technology Conference (VTC-Fall)","volume":"28 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80912744","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 : 2016-09-01DOI: 10.1109/VTCFall.2016.7880931
H. Tchouankem
The vehicle-to-vehicle communication through exchange of information between vehicles and their neighborhood provides great opportunity to improve road safety and traffic efficiency. Consequently, safety-based V2V applications have to fulfill quality requirements in order to help drivers in critical situations on rural and motorway roads, as well as in urban and inner-city areas. However, due to the inevitable presence of stationary radio shadowing, especially in inner-city intersections, a significant contingent of message transmissions will be susceptible to recurrent signal attenuation caused by building obstructions. In this paper, we characterize the intersection topologies in urban areas by analyzing the presence and placement of buildings around intersections from a data set covering more than twenty five big cities selected worldwide. For the evaluation, we consider real data gathered from a free available online map that provides geographical data and street networks. Moreover, a simple approach allowing a meticulous characterization, and dealing with the high computational time and memory constraints is introduced.
{"title":"Characterization of Intersection Topologies in Urban Areas for Vehicle-to-Vehicle Communication","authors":"H. Tchouankem","doi":"10.1109/VTCFall.2016.7880931","DOIUrl":"https://doi.org/10.1109/VTCFall.2016.7880931","url":null,"abstract":"The vehicle-to-vehicle communication through exchange of information between vehicles and their neighborhood provides great opportunity to improve road safety and traffic efficiency. Consequently, safety-based V2V applications have to fulfill quality requirements in order to help drivers in critical situations on rural and motorway roads, as well as in urban and inner-city areas. However, due to the inevitable presence of stationary radio shadowing, especially in inner-city intersections, a significant contingent of message transmissions will be susceptible to recurrent signal attenuation caused by building obstructions. In this paper, we characterize the intersection topologies in urban areas by analyzing the presence and placement of buildings around intersections from a data set covering more than twenty five big cities selected worldwide. For the evaluation, we consider real data gathered from a free available online map that provides geographical data and street networks. Moreover, a simple approach allowing a meticulous characterization, and dealing with the high computational time and memory constraints is introduced.","PeriodicalId":6484,"journal":{"name":"2016 IEEE 84th Vehicular Technology Conference (VTC-Fall)","volume":"35 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81968440","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 : 2016-09-01DOI: 10.1109/VTCFall.2016.7881223
D. Aziz, H. Bakker, A. Ambrosy, Qi Liao
Current cellular networks are mainly designed for the transmission of broadband packet payloads. Due to this, signalling mechanisms are inefficient for small packet payloads. Future trends predict an explosion of sporadic small packet transmissions due to machine type and always-ON type applications. Therefore, we target signalling minimization in 5G. In particular, we define user and service centric connection and mobility management by 5G radio access network (5G-RAN). The key idea is to anchor the core network connection for a user in 5G-RAN with the help of a user centric mobility area. This area is dynamically managed by 5G-RAN for each user. For a mobile user within this area, we minimize the core network signalling related to connection transitions, paging and handover. We present the performance assessment of our proposal with the help of simulations. The results show significant gains in terms of signalling reduction with respect to 4G-LTE approach.
{"title":"Signalling Minimization Framework for Short Data Packet Transmission in 5G","authors":"D. Aziz, H. Bakker, A. Ambrosy, Qi Liao","doi":"10.1109/VTCFall.2016.7881223","DOIUrl":"https://doi.org/10.1109/VTCFall.2016.7881223","url":null,"abstract":"Current cellular networks are mainly designed for the transmission of broadband packet payloads. Due to this, signalling mechanisms are inefficient for small packet payloads. Future trends predict an explosion of sporadic small packet transmissions due to machine type and always-ON type applications. Therefore, we target signalling minimization in 5G. In particular, we define user and service centric connection and mobility management by 5G radio access network (5G-RAN). The key idea is to anchor the core network connection for a user in 5G-RAN with the help of a user centric mobility area. This area is dynamically managed by 5G-RAN for each user. For a mobile user within this area, we minimize the core network signalling related to connection transitions, paging and handover. We present the performance assessment of our proposal with the help of simulations. The results show significant gains in terms of signalling reduction with respect to 4G-LTE approach.","PeriodicalId":6484,"journal":{"name":"2016 IEEE 84th Vehicular Technology Conference (VTC-Fall)","volume":"74 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85716912","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 : 2016-09-01DOI: 10.1109/VTCFall.2016.7881063
Shinya Kumagai, Yuta Seki, F. Adachi
An introduction of multi-user multiple-input multiple-output (MU-MIMO) to distributed antenna-based small-cell networks is considered a promising approach toward 5G mobile networks to enhance the sum throughput. However, the inter-symbol interference (ISI) caused by the channel frequency-selectivity, the inter-antenna interference (IAI), and the inter-user interference (IUI) degrade the MU-MIMO downlink throughput. This paper proposes two joint transmit-and-receive (Tx/Rx) filtering schemes (called BD-SVD and MMSE-SVD) for MU-MIMO downlinks using single-carrier (SC) transmission and orthogonal frequency-division multiplexing (OFDM) transmission. In BD-SVD, IUI is removed by block diagonalization (BD) at the transmitter side, and then, the equivalent channel after BD is transformed into IAI-free eigenmodes using singular value decomposition (SVD). On the other hand, in MMSE-SVD, BD is not used and the channel is directly transformed into eigenmodes. IUI and IAI are suppressed by a minimum mean square error (MMSE)-based precoding at the transmitter assuming that each receiver does eigenmode reception. Furthermore, in the case of SC downlink, ISI is suppressed by applying MMSE-based Tx power allocation (PA) and Rx frequency-domain equalization (FDE) to each eigenmode. Numerical results show that BD-SVD and MMSE-SVD achieve a higher sum throughput than conventional MMSE precoding.
{"title":"Joint Tx/Rx Signal Processing for Distributed Antenna MU-MIMO Downlink","authors":"Shinya Kumagai, Yuta Seki, F. Adachi","doi":"10.1109/VTCFall.2016.7881063","DOIUrl":"https://doi.org/10.1109/VTCFall.2016.7881063","url":null,"abstract":"An introduction of multi-user multiple-input multiple-output (MU-MIMO) to distributed antenna-based small-cell networks is considered a promising approach toward 5G mobile networks to enhance the sum throughput. However, the inter-symbol interference (ISI) caused by the channel frequency-selectivity, the inter-antenna interference (IAI), and the inter-user interference (IUI) degrade the MU-MIMO downlink throughput. This paper proposes two joint transmit-and-receive (Tx/Rx) filtering schemes (called BD-SVD and MMSE-SVD) for MU-MIMO downlinks using single-carrier (SC) transmission and orthogonal frequency-division multiplexing (OFDM) transmission. In BD-SVD, IUI is removed by block diagonalization (BD) at the transmitter side, and then, the equivalent channel after BD is transformed into IAI-free eigenmodes using singular value decomposition (SVD). On the other hand, in MMSE-SVD, BD is not used and the channel is directly transformed into eigenmodes. IUI and IAI are suppressed by a minimum mean square error (MMSE)-based precoding at the transmitter assuming that each receiver does eigenmode reception. Furthermore, in the case of SC downlink, ISI is suppressed by applying MMSE-based Tx power allocation (PA) and Rx frequency-domain equalization (FDE) to each eigenmode. Numerical results show that BD-SVD and MMSE-SVD achieve a higher sum throughput than conventional MMSE precoding.","PeriodicalId":6484,"journal":{"name":"2016 IEEE 84th Vehicular Technology Conference (VTC-Fall)","volume":"26 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78067963","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 : 2016-09-01DOI: 10.1109/VTCFall.2016.7881182
Wei Si, D. Starobinski, M. Laifenfeld
The Controller Area Network (CAN) is a shared medium, priority-based communication protocol, widely used in the automotive industry for interconnecting electrical components. Although allowing messages to take priority over others in accessing the shared medium is naturally desirable for vehicular applications, it also provides a vulnerability for Denial-of-Service (DoS) attacks. This paper studies the impact of such priority- based DoS attacks and proposes a mitigating scheme. We find that implementation details have a significant impact on the efficiency of priority- based DoS attacks. Nevertheless, with a proper configuration, a single attacker can block an entire CAN network and deem it unusable. To mitigate this problem, we propose integrating a wireless interface and design a hybrid wired/wireless protocol that schedules packet transmissions on the wired and wireless links. Our testbed results show that the hybrid wired/wireless protocol improves the throughput under a two-node DoS attack by a factor of four. Additional experimental results demonstrate that our hybrid wired/wireless protocol is robust to jamming attacks on the wireless link.
{"title":"Protocol-Compliant DoS Attacks on CAN: Demonstration and Mitigation","authors":"Wei Si, D. Starobinski, M. Laifenfeld","doi":"10.1109/VTCFall.2016.7881182","DOIUrl":"https://doi.org/10.1109/VTCFall.2016.7881182","url":null,"abstract":"The Controller Area Network (CAN) is a shared medium, priority-based communication protocol, widely used in the automotive industry for interconnecting electrical components. Although allowing messages to take priority over others in accessing the shared medium is naturally desirable for vehicular applications, it also provides a vulnerability for Denial-of-Service (DoS) attacks. This paper studies the impact of such priority- based DoS attacks and proposes a mitigating scheme. We find that implementation details have a significant impact on the efficiency of priority- based DoS attacks. Nevertheless, with a proper configuration, a single attacker can block an entire CAN network and deem it unusable. To mitigate this problem, we propose integrating a wireless interface and design a hybrid wired/wireless protocol that schedules packet transmissions on the wired and wireless links. Our testbed results show that the hybrid wired/wireless protocol improves the throughput under a two-node DoS attack by a factor of four. Additional experimental results demonstrate that our hybrid wired/wireless protocol is robust to jamming attacks on the wireless link.","PeriodicalId":6484,"journal":{"name":"2016 IEEE 84th Vehicular Technology Conference (VTC-Fall)","volume":"12 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81647709","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 : 2016-09-01DOI: 10.1109/VTCFall.2016.7880945
Yuzhou Li, Min Sheng, Zhisheng Sun, Yuhua Sun, Lei Liu, D. Zhai, Jiandong Li
In this paper, we investigate the energy-efficient transmission problem by resource allocation in SCMA networks. We formulate it as an optimization problem to maximize the network energy efficiency (EE) subject to quality-of-service (QoS) requirements, codebook assignment, power allocation, and subcarrier reuse constraints. Due to its mixed combinatory, we separate codebook assignment and power allocation to devise suboptimal but cost- efficient algorithms. With power equally distributed, we first propose a novel scheme to assign codebooks. We then develop a derivative- bisection based algorithm to optimally solve the resultant power allocation problem by exploiting its quasiconcave structure. Simulation results exhibit the superiority of the proposed algorithms against the existing classical schemes and of SCMA over OFDMA in terms of the network EE.
{"title":"Cost-Efficient Codebook Assignment and Power Allocation for Energy Efficiency Maximization in SCMA Networks","authors":"Yuzhou Li, Min Sheng, Zhisheng Sun, Yuhua Sun, Lei Liu, D. Zhai, Jiandong Li","doi":"10.1109/VTCFall.2016.7880945","DOIUrl":"https://doi.org/10.1109/VTCFall.2016.7880945","url":null,"abstract":"In this paper, we investigate the energy-efficient transmission problem by resource allocation in SCMA networks. We formulate it as an optimization problem to maximize the network energy efficiency (EE) subject to quality-of-service (QoS) requirements, codebook assignment, power allocation, and subcarrier reuse constraints. Due to its mixed combinatory, we separate codebook assignment and power allocation to devise suboptimal but cost- efficient algorithms. With power equally distributed, we first propose a novel scheme to assign codebooks. We then develop a derivative- bisection based algorithm to optimally solve the resultant power allocation problem by exploiting its quasiconcave structure. Simulation results exhibit the superiority of the proposed algorithms against the existing classical schemes and of SCMA over OFDMA in terms of the network EE.","PeriodicalId":6484,"journal":{"name":"2016 IEEE 84th Vehicular Technology Conference (VTC-Fall)","volume":"96 4 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87692430","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 : 2016-09-01DOI: 10.1109/VTCFall.2016.7880869
Shaojie Liu, Sai Huang, Wei Li, Yifan Zhang, Z. Feng
As traditional spectrum sensing approaches unable to deal with the contradiction between detection accuracy and complexity in cognitive radio network, a novel q-weighed sequential cooperative energy detection method for spectrum sensing in time varying channel is proposed in this paper to achieve better performance with lower complexity. By adding the q- weighted log likelihood ratio (LLR) of the past local observations from previous sensing slots to the current LLR sequentially, cognitive radio nodes can aggregate the current and previous received energy values to yield the improvement of sensing performance. Moreover, we pose a q-weighted K-out of-N voting rule at the fusion center to minimize the total error probability. For different probability of primary signal for turning its state from active to idle, we employ corresponding different weighted value q to make the sensing scheme more flexible and efficient.
{"title":"A Novel q-Weighed Sequential Cooperative Energy Detection Method for Spectrum Sensing","authors":"Shaojie Liu, Sai Huang, Wei Li, Yifan Zhang, Z. Feng","doi":"10.1109/VTCFall.2016.7880869","DOIUrl":"https://doi.org/10.1109/VTCFall.2016.7880869","url":null,"abstract":"As traditional spectrum sensing approaches unable to deal with the contradiction between detection accuracy and complexity in cognitive radio network, a novel q-weighed sequential cooperative energy detection method for spectrum sensing in time varying channel is proposed in this paper to achieve better performance with lower complexity. By adding the q- weighted log likelihood ratio (LLR) of the past local observations from previous sensing slots to the current LLR sequentially, cognitive radio nodes can aggregate the current and previous received energy values to yield the improvement of sensing performance. Moreover, we pose a q-weighted K-out of-N voting rule at the fusion center to minimize the total error probability. For different probability of primary signal for turning its state from active to idle, we employ corresponding different weighted value q to make the sensing scheme more flexible and efficient.","PeriodicalId":6484,"journal":{"name":"2016 IEEE 84th Vehicular Technology Conference (VTC-Fall)","volume":"16 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87840661","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}
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