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International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Xiaoxi Guo Jianjun Hao Yijun Guo Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

In single-relay multi-users two-way network, the aim is to transmit packets from each node to all nodes in order to implement information exchange between various nodes. network coding has the benefit of high throughput efficiency compare to ARQ approach. In addition, random linear sparse network coding (RLSNC) can reduce the algorithm complexity based on general RLNC. In this paper, single-transmitting mixed network coding (STMNC) is proposed in this single-relay multi-users two-way network The purpose is to increase the throughput efficiency with the least cost of latency and complexity.

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Degree of polarization spectrum sensing algorithm for cognitive radios

Degree of polarization spectrum sensing algorithm for cognit...

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International Symposium on Wireless Personal Multimedia Communications (WPMC)

作者： Lin Lin Caili Guo Chunyan Feng Xiaobin Wu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

A new spectrum sensing algorithm-degree of polarization (DoP) sensing algorithm is proposed in this paper. By exploiting a pair of dual-polarized antenna at the receiver, DoP of the received vector signal is estimated and utilized to detect the presence of primary users (PU) based on the polarization characteristics of electromagnetic waves. This method requires no prior information of the PU signals and the channels from PUs to the secondary users (SU). Theoretical analysis of detection probability, false alarm probability and threshold of the proposed algorithm is presented in detail. The theoretical analysis also shows that our algorithm overcomes the noise uncertainty problem. Simulations based on wireless microphone signals considering different SU receiver scenarios are provided to certify the effectiveness of the proposed method. Compared with the energy detector (ED), the maximum-to-minimum ratio eigenvalue (MME) detector and the arithmetic-to-geometric mean (AGM) detector, by applying polarization information signal carries, DoP achieves a better detection performance than AGM, MME and ED with noise uncertainty.

关键词： Noise Detectors Correlation Eigenvalues and eigenfunctions Receivers Uncertainty

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Analytic hierarchy process in load balancing for the multicast and unicast mixed services in LTE

Analytic hierarchy process in load balancing for the multica...

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IEEE Conference on Wireless Communications and networking

作者： Min Wang Chunyan Feng Tiankui Zhang Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

In the LTE networks, the multicast services can be transmitted by single frequency network (SFN) mode and point-to-multipoint (PTM) mode, and the unicast services are delivered with point-to-point (PTP) mode. To avoid the network congestion in the LTE networks with the multicast and unicast mixed services, an analytic hierarchy process (AHP) in load balancing is proposed to minimize the demanded radio resources of the maximum load cell. The system model of the demanded radio resources in the maximum load cell is based on AHP. For the same multicast service, the AHP calculates the weight of the demanded radio resources with the three transmission modes of SFN, PTM and PTP. Then the selecting problem of the transmission mode is solved by means of simulated annealing (SA) heuristics. It selects the optimal mode between SFN and PTM for the multicast services. Simulation results show that the proposed AHP in load balancing achieves less demanded radio resources of the maximum load cell than SFN mode for all the multicast services.

关键词： Unicast Load management Quality of service Computer architecture Load modeling Simulated annealing Resource management

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Energy efficient power optimization in two-tier femtocell networks with interference pricing

Energy efficient power optimization in two-tier femtocell ne...

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International Conference on Computing and networking Technology (ICCNT)

作者： Deli Liu Wei Zheng Haijun Zhang Wenmin Ma Xiangming Wen Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781467313261

With the mass deployment of femtocells, serious cross-tier interference may be caused to the macrocells, together with large amounts of energy consumption. In this paper, the power control problem for the co-channel deployed femtocells is investigated. We first model the uplink power control problem as a non-cooperative game, where co-channel interference is taken into account in maximizing the energy-aware utility. By introducing a convex pricing function of the cross-tier interference, Pareto improvement can be obtained. Furthermore, based on the non-cooperative game, we devise a distributed power allocation algorithm together with an optimal price seeking algorithm. Simulation results show that the proposed algorithm can improve user utilities significantly, compared with existing power control algorithms.

关键词： Uplink Pricing

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Clustering based power saving algorithm for self-organized sleep mode in femtocell networks

Clustering based power saving algorithm for self-organized s...

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International Symposium on Wireless Personal Multimedia Communications (WPMC)

作者： Wei Li Wei Zheng Yuanbao Xie Xiangming Wen Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

A large-scale deployment of femtocell BSs (FBSs) causes the substantial energy consumption. One fairly intuitive way to minimize the energy consumption is to switch off the wireless air interface, or to keep FBSs in the energy saving mode for the most time while preserving the quality of service (QoS) experienced by users. Utilizing this concept, this paper proposes a clustering based power saving algorithm (CPSA) for self-organized sleep mode in femtocell networks. Firstly, CPSA builds a leader-member cluster framework, in which each FBS is either a FBS leader (FL) or a FBS member (FM). Then, the FL acts as an autonomous entity and is responsible for detecting active calls in the cluster coverage, while the FMs without the active user can entirely shut down pilot transmissions and the related processing all the time. So it is suited for self-organizing networks (SONs). With the practical LTE system parameters, simulation results show that the proposed algorithm outperforms three prominent related schemes in terms of average energy consumption and accumulative interference time. Furthermore, the results provide some guidelines for deploying energy efficient femtocell networks.

关键词： Frequency modulation Energy consumption Femtocell networks Clustering algorithms Switches Interference Macrocell networks

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Theoretical polarized channel model and analysis of XPD and polarization correlation under narrowband macrocell environment

Theoretical polarized channel model and analysis of XPD and ...

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International Symposium on Wireless Personal Multimedia Communications (WPMC)

作者： Xiaobin Wu Caili Guo Chunyan Feng Lin Lin Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China

A theoretical polarized channel model has been proposed by introducing per path polarization characterization based on geometrical depolarization theory. According to the model, polarization array response vector for narrowband macro-cell environment has been derived through intricate geometrical deduction. Mathematical expressions for polarized channel power imbalance XPD (cross polarization discrimination) and polarization correlation have been developed by using VMF (von Mises-Fisher) distribution which characterizes both azimuth and elevation angle. Numerical integration technique is used to analyze the effect of scatterers' angular characteristics including average azimuth angle, average elevation angle and angular spread on XPD and polarization correlation due to the complexity of geometrical deduction. Our analytical results agree well with previous published XPD and polarization correlation measurements and can be used to predict further XPD and polarization correlation characteristics. Analytical results indicate that both XPD and polarization correlation are highly angle-sensitive.

关键词： Correlation Azimuth Channel models Antennas Narrowband Macrocell networks Polarization

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Prolonging network lifetime in two-level heterogeneous Wireless Sensor networks

Prolonging network lifetime in two-level heterogeneous Wirel...

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2012 International Symposium on Communications and Information Technologies, ISCIT 2012

作者： Cui, Hongyan Feng, Chen Liu, Ren Ping Huang, Xu Liu, Yunjie Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China ICT Centre Commonwealth Scientific and Industrial Research Organization Sydney NSW Australia Faculty of Information Sciences and Engineering University of Canberra 2601 Australia

ISBN: (纸本)9781467311571

It is important to prolong the network lifetime in Wireless Sensor networks. There are two approaches to increase the network lifetime, which are balancing energy consumption and reducing the number of non-working nodes. This paper presents two Cluster head Selection algorithms, one is based on Ensuring target Area and the other is based on Affinity Propagation. We propose a method which makes the energy uniformly distributed throughout the network nodes. In particular, we analyse the effect of the powerful nodes on the network lifetime and cluster characteristics. Simulation results show that the two proposed algorithms distribute non-working nodes evenly, such that the target area is well covered by the remaining nodes. Our proposed algorithms balance the traffic load and energy distributions, and prolong the network lifetime effectively compared with the existing schemes. © 2012 IEEE.

关键词： Energy utilization

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Characterizing Internet Backbone Traffic Based on Deep Packets Inpection and Deep Flows Inspection

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China Communications 2012年第5期9卷 42-54页

作者：杨洁袁仑林平丛蓉程钢尼万-安瑟瑞 Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Research Institution of China Mobile Microsoft Corporation RedmondUSA New Jersey Institute of Technology NewarkUSA

Based on the massive data collected with a passive network monitoring equipment placed in China＇s backbone, we present a deep insight into the network backbone traffic and evaluate various ways for inproving traffic classifying efficiency in this pa- per. In particular, the study has scrutinized the net- work traffic in terms of protocol types and signatures, flow length, and port distffoution, from which mean- ingful and interesting insights on the current Intemet of China from the perspective of both the packet and flow levels are derived. We show that the classifica- tion efficiency can be greatly irrproved by using the information of preferred ports of the network applica- tions. Quantitatively, we find two traffic duration thresholds, with which 40% of TCP flows and 70% of UDP flows can be excluded from classification pro- cessing while the in^act on classification accuracy is trivial, i.e., the classification accuracy can still reach a high level by saving 85% of the resources.

关键词： network traffic traffic characterization traffic monitoring packet flow

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DNCA:AN EFFICIENT CHANNEL ASSIGNMENT FOR MULTI-INTERFACE MULTI-CHANNEL AD HOC WIRELESS networkS

DNCA:AN EFFICIENT CHANNEL ASSIGNMENT FOR MULTI-INTERFACE MUL...

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The 3rd IEEE International Conference on network Infrastructure and Digital Content (2012年第三届IEEE网络基础设施与数字内容国际会议(IEEE IC-NIDC2012))

作者： Xiaowei Ni Chunxiu Xu Muqing Wu Jingrong Wen Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing 100876 China

The capacity of an IEEE 802.1 l-based multihop wireless network is *** effectively utilizing multiple non-overlapping channels and multiple interfaces,collision and co-channel interference can be *** allows more concurrent transmissions and thus enhances the network *** this paper,we introduce an efficient distributed negotiated channel assignment protocol,called *** each node,DNCA conducts a local optimization by greedy balancing the number of neighbors on each *** using DNCA,it does not require changes to higherlevel *** describe the design and implementation of DNCA,and analyze its performance using ns-3 network *** results show that DNCA provides much higher system capacity and lower end-to-end packet delay.

关键词： Ad Hoc networks Ns-3 Multiple channels Channel assignment

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BASE STATION SWITCHING BASED DYNAMIC ENERGY SAVING ALGORITHM FOR CELLULAR networkS

BASE STATION SWITCHING BASED DYNAMIC ENERGY SAVING ALGORITHM...

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The 3rd IEEE International Conference on network Infrastructure and Digital Content (2012年第三届IEEE网络基础设施与数字内容国际会议(IEEE IC-NIDC2012))

作者： Tian Kang Xuekang Sun Tiankui Zhang Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing 100876 China

Switching the base station (BS) with low traffic into sleep mode is considered as one of the most promising technologies for energy saving in the cellular *** this paper,*** on the switching method considering the quality of service (QoS) as well as energy saving of the whole *** network topology is modeled as a weighted affinity graph to describe the possible associations of user equipment (UEs) and the BSs in the *** the maximization problem of the network performance valued by the QoS and energy saving is *** on that,a dynamic energy saving (DES) algorithm is *** optimized by DES,the network is reconfigured by switching certain BSs into sleep *** results under different traffic conditions demonstrate that the proposed DES algorithm can significantly reduce energy consumption and improve the energy efficiency.

关键词： Green network Energy efficiency Base station switching

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