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Utility-based bandwidth allocation algorithm for heterogeneous wireless networks

Science China(Information Sciences) 2013年第2期56卷 139-151页

作者： CHAI Rong WANG XiuJuan CHEN QianBin svensson tommy Key Lab of Mobile Communication Technology Chongqing University of Posts and Telecommunications Department of Signals and Systems Chalmers University of Technology

In next generation wireless network (NGWN), mobile users are capable of connecting to the core network through various heterogeneous wireless access networks, such as cellular network, wireless metropolitan area network (WMAN), wireless local area network (WLAN), and ad hoc network. NGWN is expected to provide high-bandwidth connectivity with guaranteed quality-of-service to mobile users in a seamless manner; however, this desired function demands seamless coordination of the heterogeneous radio access network (RAN) technologies. In recent years, some researches have been conducted to design radio resource management (RRM) architectures and algorithms for NGWN; however, few studies stress the problem of joint network performance optimization, which is an essential goal for a cooperative service providing scenario. Furthermore, while some authors consider the competition among the service providers, the QoS requirements of users and the resource competition within access networks are not fully considered. In this paper, we present an interworking integrated network architecture, which is responsible for monitoring the status information of different radio access technologies (RATs) and executing the resource allocation algorithm. Within this architecture, the problem of joint bandwidth allocation for heterogeneous integrated networks is formulated based on utility function theory and bankruptcy game theory. The proposed bandwidth allocation scheme comprises two successive stages, i.e., service bandwidth allocation and user bandwidth allocation. At the service bandwidth allocation stage, the optimal amount of bandwidth for different types of services in each network is allocated based on the criterion of joint utility maximization. At the user bandwidth allocation stage, the service bandwidth in each network is optimally allocated among users in the network according to bankruptcy game theory. Numerical results demonstrate the efficiency of the proposed algorithm.

关键词： heterogeneous wireless network bandwidth allocation utility function bankruptcy game theory

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Performance of power control in inter-cell interference coordination for frequency reuse

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The Journal of China Universities of Posts and Telecommunications 2010年第1期17卷 37-43页

作者： ZHANG Hui XU Xiao-dong LI Jing-ya TAO Xiao-feng tommy svensson Carmen Botella Wireless Technology Innovation Institute Beijing University of Posts and Telecommunications Beijing 100876 China Key Laboratory of Universal Wireless Commtmications Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China Chalmers University of Technology Sweden

To mitigate inter-cell interference in 3G evolution systems, a novel inter-cell interference coordination scheme called soft fractional frequency reuse is proposed in this article, which enables to improve the data rate in cell-edge. On this basis, an inter-cell power control is presented for the inter-cell interference coordination, and the inter-cell balanced signal to interference plus noise ratio （SINR） among users is established for power allocation, which enables mitigation of inter-cell interference. Especially, the power control is based on a novel exponential kernel arithmetic kernel equations. Numerical results show that the proposed rate compared to the existing power control algorithms. equation at higher convergence speed than the traditional scheme improves the throughput and reduces the blocking

关键词： 3G evolution inter-cell interference power control power allocation exponential iteration

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Improved resource allocation strategy in SU-CoMP network

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The Journal of China Universities of Posts and Telecommunications 2011年第4期18卷 7-12页

作者： CHEN Xin XU Xiao-dong LI Hong-jia TAO Xiao-feng tommy svensson Carmen Botella Wireless Technology Innovation Institute Key Laboratory of Universal Wireless Communication Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China Signal and Systems Chalmers University of Technology SE-412-96 Goteborg Sweden

Coordinated multi-point transmission and reception （CoMP） for single user, named as SU-CoMP, is considered as an efficient approach to mitigate inter-cell interference in orthogonal frequency division multiple access （OFDMA） systems. Two prevalent approaches in SU-CoMP are coordinated scheduling （CS） and joint processing （JP）. Although JP in SU-CoMP has been proved to achieve a great link performance improvement for the cell-edge user, efficient resource allocation （RA） on the system level is quite needed. However, so far limited work has been done considering JP, and most existing schemes achieved the improvement of cell-edge performance at cost of the cell-average performance degradation compared to the single cell RA. In this paper, a two-phase strategy is proposed for SU-CoMP networks. CS and JP are combined to improve both cell-edge and cell-average performance. Compared to the single cell RA, simulation results demonstrate that, the proposed strategy leads to both higher cell-average and cell-edge throughput.

关键词： OFDMA system SU-CoMP RA binary power allocation based multi-cell coordinated proportional fair scheduling (BP-CPF) sub-channels assignment forjoint processing (JP-SA)

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Multi-beam cooperative frequency reuse for coordinated multi-point transmission

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The Journal of China Universities of Posts and Telecommunications 2010年第6期17卷 11-18页

作者： LI Jing-ya XU XiaoTdong ZHANG Hui TAO Xiao-feng tommy svensson Carmen Botella CHEN Xin Wireless Technology Innovation Institute Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing 100876 China Signals and Systems Chahners University of Technology SE-412-96 Gothenburg Sweden

Coordinated multi-point （CoMP） joint transmission is considered in the 3rd generation partnership project （3GPP） long term evolution （LTE）-advanced as a key technique to mitigate inter-cell interference and improve the cell-edge performance. To effectively apply CoMP joint transmission,efficient frequency reuse schemes need to be designed to support resource management cooperation among coordinated cells. However,most of the existing frequency reuse schemes are not suitable for CoMP systems due to not considering multi-point joint transmission scenarios in their frequency reuse rules. In addition,the restrictions of frequency resources in those schemes result in a high blocking probability. To solve the above two problems,a multi-beam cooperative frequency reuse （MBCFR） scheme is proposed in this paper,which reuses all the available frequency resources in each sector and supports multi-beam joint transmission for cell-edge users. Besides,the blocking probability is proved to be efficiently reduced. Moreover,a frequency-segment-sequence based MBCFR scheme is introduced to further reduce the inter-cell interference. System level simulations demonstrate that the proposed scheme results in higher cell-edge average throughput and cell-average throughput with lower blocking probability.

关键词： frequency reuse inter-cell interference coordinated multi-point transmission LTE-advanced

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Multicell power allocation method based on game theory for inter-cell interference coordination

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Science in China(Series F) 2009年第12期52卷 2378-2384页

作者： ZHANG Hui XU XiaoDong LI JingYa TAO XiaoFeng ZHANG Ping svensson tommy BOTELLA Carmen Wireless Technology Innovation Institute Beijing University of Posts and Telecommunications Beijing 100876 China Key Laboratory of Universal Wireless Communications Ministry of Education Beijing 100876 China Chalmers University of Technology Sweden

As a new technology, coordinated multipoint （CoMP） transmission is included in LTE-Advanced study item. Moreover, the network architecture in LTE-Advanced system is modified to take into account coordinated transmission. Under this background, a novel power allocation game model is established to mitigate inter-cell interference with cellular coordination. In the light of cellular cooperation relationship and centralized control in eNodeB, the power allocation in each served antenna unit aims to make signal to interference plus noise ratio （SINR） balanced among inter-cells. Through the proposed power allocation game algorithm, the users＇ SINR can reach the Nash equilibrium, making it feasible to reduce the co-frequency interference by decreasing the transmitted power. Numerical results show that the proposed power allocation algorithm improves the throughput both in cell-center and cell-edge. Moreover, the blocking rate in cell-edge is reduced too.

关键词： LTE-Advanced inter-cell interference coordination CoMP game theory power allocation

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TIME-CRITICAL COMMUNICATION AND COMPUTATION FOR INTELLIGENT VEHICULAR NETWORKS

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China Communications 2021年第6期18卷 I0004-I0006页

作者： Shanzhi Chen tommy svensson Sheng Zhou Shan Zhang State Key Laboratory of Wireless Mobile Communications CATT Chalmers University of Technology in Gothen-burg Sweden Department of Electronic Engineering Tsinghua University School of Computer Science and Engineering Beihang University BeijingChina

Vehicular networks are expected to empower auto mated driving and intelligent transportation via vehicle-to-everything(V2X)communications and edge/cloud-assisted computation,and in the meantime Cellular V2X(C-V2X)is gaining wide support from the global industrial *** 5G NR-V2X technology is the evolution of LTE-V2X,which is expected to provide ultra-Reliable and Low-Latency Communications(uRLLC)with 1ms latency and 99.999%***,vehicular networks still face great challenges in supporting many emerging time-critical applications,which comprise sensing,communication and computation as closed-loops.

关键词： networks V2X driving

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Future connected vehicles:Communications demands,privacy and cyber-security

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Communications in Transportation Research 2022年第1期2卷 39-41页

作者： Tomas Olovsson tommy svensson Jiaming Wu Department of Computer Science and Engineering Chalmers University of TechnologyGothenburgSE41296Sweden Department of Electrical Engineering Chalmers University of TechnologyGothenburgSE41296Sweden Department of Architecture and Civil Engineering Chalmers University of TechnologyGothenburgSE41296Sweden

*** With the advance of data collection,data processing,telecommunication and vehicular technologies,connected vehicles(CVs)have been emerging as a crucial branch of smart mobility(Olia et al.,2015;Li et al.,2021).Its basic idea is to realize real-time exchanges and processing of essential information,such as positions and destinations,among surrounding vehicles and infrastructures.

关键词： connected branch destination

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Computational modelling and simulation to mitigate the risk of daylight exposure in tropical museum buildings

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Energy and Built Environment 2024年第2期5卷 171-184页

作者： Rizki A.Mangkuto tommy Partogi Simamora Desliana Putri Pratiwi Mochamad Donny Koerniawan Building Physics Research Group Faculty of Industrial TechnologyInstitut Teknologi BandungBandungIndonesiaJl.Ganesha 10Labtek VIBandung 40132Indonesia Engineering Physics Program Faculty of Industrial TechnologyInstitut Teknologi BandungBandungIndonesiaJl.Ganesha 10Labtek VIBandung 40132Indonesia Building Technology Research Group School of ArchitecturePlanningand Policy DevelopmentInstitut Teknologi BandungBandungIndonesiaJl.Ganesha 10Labtek IXBBandung 40132Indonesia

In museum design and operation,daylight is typically discouraged due to high risk of damaging the display ***,past studies in high-latitude regions have shown the possibility to apply daylight in museums,so long as it is carefully planned,and the display objects are not from the category of high responsive *** the tropical region,the influence of daylighting on light exposure on museum objects is still *** study therefore aims to assess and mitigate the impact of annual daylight exposure on objects with low responsive materials in a tropical daylit museum *** daylight modelling and simulation are performed to achieve the objective,followed with Morris sensitivity analysis and Mahalanobis distance classifier to optimise the *** is found that either WWR or glazing transmissivity gives the greatest influence on the performance *** on the proposed optimisation algorithm,it is possible to determine the optimum solutions satisfying the performance indicators target,for a certain opening ***,the contribution of this study is the proposed computational modelling and simulation methods to mitigate the exposure risk while optimising daylight as a renewable energy source.

关键词： Daylighting Museum Computational modelling Simulation Annual light exposure

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Sedimentary records of contaminant inputs in Frobisher Bay,Nunavut

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Environmental Science and Ecotechnology 2024年第2期18卷 28-42页

作者： Meaghan C.Bartley tommy Tremblay Amila O.De Silva CMichelle Kamula Stephen Ciastek Zou Zou A.Kuzyk Centre for Earth Observation Science Clayton H.Riddell Faculty of EnvironmentEarth and ResourcesUniversity of ManitobaWinnipegManitobaR3T 2N2Canada Department of Environment and Geography Clayton H.Riddell Faculty of EnvironmentEarth and ResourcesUniversity of ManitobaWinnipegManitobaR3T 2N2Canada Canada-Nunavut Geoscience Office IqaluitNunavutX0A 0H0Canada Environment and Climate Change Canada BurlingtonOntarioL7S 1A1Canada Department of Earth Sciences Clayton H.Riddell Faculty of EnvironmentEarth and ResourcesUniversity of ManitobaWinnipegManitobaR3T 2N2Canada

Contaminants,such as polychlorinated biphenyls(PCBs),polycyclic aromatic hydrocarbons(PAHs),heavy metals,and per and polyfluoroalkyl substances(PFASs),primarily reach the Arctic through long-range atmospheric and oceanic ***,local sources within the Arctic also contribute to the levels observed in the environment,including legacy sources and new sources that arise from activities associated with increasing commercial and industrial *** City of Iqaluit in Frobisher Bay,Nunavut(Canada),has seen rapid population growth and associated development during recent decades yet remains a site of interest for ocean protection,where Inuit continue to harvest country *** the present study,seven dated marine sediment cores collected in Koojesse Inlet near Iqaluit,and from sites in inner and outer Frobisher Bay,respectively,were analyzed for total mercury(THg),major and trace elements,PAHs,PCBs,and *** sedimentary record in Koojesse Inlet shows a period of Aroclor 1260-like PCB input concurrent with military site presence in the 1950e60s,followed by decades of input of pyrogenic PAHs,averaging about ten times background ***-surface sediments in Koojesse Inlet also show evidence of transient local-source inputs of THg and PFASs,and recycling or continued slow release of PCBs from legacy land-based *** in PFAS congener composition clearly distinguish the local sources from long-range *** Koojesse Inlet but still in inner Frobisher Bay,9.2 km from Iqaluit,sediments showed evidence of both local source(PCB)and longrange *** outer Frobisher Bay,an up-core increase in THg and PFASs in sediments may be explained by ongoing inputs of these contaminants from long-range *** context for ocean protection and country food harvesting in this region of the Arctic clearly involves both local sources and long-range transport,with past human activities leaving a long legacy insofar as levels of persistent o

关键词： Arctic sediments Mercury Polycyclic aromatic hydrocarbons(PAHs) Polychlorinated biphenyls(PCBs) Per and polyfluoroalkyl substances(PFASs) Persistent organic pollutants(POPs)

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陨石盘“时”破天惊

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商业周刊（中文版） 2024年第3期 74-79页

作者： tommy 不详

转瞬易逝的流星划过天际,从遥远星河疾驰而来,负石伴着璀璨光芒,或在进入大气层时逐渐瓦解,或坠落于地球的大海深处,难查踪迹。因此,能够最终抵达地面井收藏于世人手中的陨石表均弥足珍贵,每一隅都独一无二,无声地诉说着来自亿方光年外... 详细信息

转瞬易逝的流星划过天际,从遥远星河疾驰而来,负石伴着璀璨光芒,或在进入大气层时逐渐瓦解,或坠落于地球的大海深处,难查踪迹。因此,能够最终抵达地面井收藏于世人手中的陨石表均弥足珍贵,每一隅都独一无二,无声地诉说着来自亿方光年外的秘密。当下将宇宙的广衰和神秘收藏腕间,在无限想象中踏上时间之旅,恐怕是藏家对陨石表趋之若鹭的一大主因,也在一定程度上让此类表极具商业价值潜力。

关键词：陨石地面井大气层流星价值潜力收藏宇宙独一无二

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