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An improved Markov method for prediction of user mobility

An improved Markov method for prediction of user mobility

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International Conference on Network and Service Management

作者： Yihang Cheng Yuanyuan Qiao Jie Yang Beijing Laboratory of Advanced Information Networks of BUPT Beijing China Beijing Key Laboratory of Network System Architecture and Convergence of BUPT Beijing China Beijing University of Posts and Telecommunications Beijing China

ISBN: (纸本)9781509032365

The developments of Information and Communication Technology (ICT) and Internet of Things (IoT) are being used to enhance quality, performance and interactivity of urban services. Benefited from the widespread adoption of mobile devices, we can collect amount of mobile data for user mobility analysis. Mining hidden information from users' mobile data is important for builders of smart city to provide better location-based service. This paper focuses on two classical domain-independent prediction models and one improved Markov model that are capable of estimating the next location. By using 27-day-long traffic data of mobile network, we extract trajectories of 4914 individuals for experiments. We find that the original Markov algorithm has a better performance in resource consumption than LZ family algorithms, but its prediction accuracy is lower than prediction accuracy of LeZi Update and Active LeZi algorithm. In order to improve the prediction accuracy of Markov and overcome drawbacks of traditional prediction algorithms, we present a new method based on Markov, which considers both temporal and spatial factors. Extensive experiments demonstrate our improved method has a better performance in location prediction. In addition, we further study the relationship between prediction accuracy and trajectory's regularity, to identify the most suitable prediction algorithm for a trajectory.

关键词： Markov processes Prediction algorithms Trajectory History Mobile communication Mobile handsets Predictive models

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Handoff management scheme based on frame loss rate and RSSI prediction for IEEE 802.11 networks

Handoff management scheme based on frame loss rate and RSSI ...

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International Symposium on Wireless Communication systems (ISWCS)

作者： Tao Lei Xiangming Wen Zhaoming Lu Wenpeng Jing Biao Zhang Gang Cao Beijing Laboratory of Advanced Information Networks Beijing Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing Beijing Advanced Innovation Center for Future Internet Technology

This paper proposes a frame loss rate (FLR) and received signal strength indicator (RSSI) prediction based handoff management scheme to reduce the ping-pong effect caused by the purely RSSI based handoff decision schemes in IEEE 802.11 networks. The proposed scheme is performed by each mobile station (MS) in a decentralized manner. In the proposed scheme, the FLR information is used as handoff trigger criterion. To perceive the change trends of wireless link thus reducing the target AP selection time, the proposed scheme adopts polynomial regression-based RSSI prediction approach. The predicted RSSI together with FLR information is used for target access point (AP) selection. Moreover, we construct neighboring AP information list (NAIL) for MSs to store the above information. Therefore, the proposed scheme can also be called NAIL-based handoff management scheme. The results indicate that the proposed scheme can effectively reduce the invalid handoffs and avoid the ping-pong effect.

关键词： Wireless communication Nails Ad hoc networks Monitoring IEEE 802.11 Standard Received signal strength indicator Wireless LAN

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A modified Matérn hard core point process for modeling and analysis of dense IEEE 802.11 networks

A modified Matérn hard core point process for modeling and ...

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International Symposium on Wireless Communication systems (ISWCS)

作者： Tao Lei Xiangming Wen Zhaoming Lu Wenpeng Jing Kun Chen Xiaoguang Zhao Beijing Laboratory of Advanced Information Networks Beijing Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing Beijing Advanced Innovation Center for Future Internet Technology

ISBN: (纸本)9781509020621

Stochastic geometry is a powerful tool for modeling wireless networks employing various MAC protocols with random topologies. For wireless networks operating carrier sense multiple access/collision avoidance (CSMA/CA) protocol, there are distance constraints between simultaneous transmitters, and only one node is allowed to transmit within its carrier sensing range. Matérn hard core point process is generally used to model and analyze the performance of this type of networks, because it is a repulsive point process that also defines a minimum distance between any two points. However, the traditional Matérn HCPP has the defect of underestimating the intensity of concurrent transmission nodes, which will affect the accuracy of analysis results, when wireless nodes are densely deployed. In this paper, we propose a modified Matérn HCPP called TM-HCPP which can mitigate the intensity underestimation problem to model dense IEEE 802.11 networks. Then, we simulate the network coverage probability using the traditional Matérn HCPP and the proposed TM-HCPP, and compare the simulated results with the theoretical analyzed results. Simulation results validate the accuracy of the proposed TM-HCPP.

关键词： IEEE 802.11 Standard Interference Measurement Wireless networks Fading channels Geometry Protocols

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A fair listen-before-talk mechanism for LTE-U using a coalition formation approach

A fair listen-before-talk mechanism for LTE-U using a coalit...

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International Symposium on Wireless Communication systems (ISWCS)

作者： Wuqiong Ding Xiangming Wen Zhaoming Lu Wenpeng Jing Yan Zeng Beijing Key Laboratory of Network System Architecture and Convergence Beijing Advanced Innovation Center for Future Internet Technology Beijing Laboratory of Advanced Information Networks Beijing Beijing University of Posts and Telecommunications Beijing China

LTE on unlicensed bands (LTE-U), which is a promising way to meet the increasing mobile data demand, has attracted world-wide interests. However, the fair coexistence of LTE-U and WLAN is a critical issue to be solved. In this paper, we devise a semi-distributed channel access approach for LTE-U in dense deployed scenario to improve its capacity and achieve fair coexistence with WLAN. Specifically, the basic listen-before-talk (LBT) mechanism is employed to guarantee the fairness for WLAN, which is similar with the medium control access (MAC) protocol of WLAN. However, in order to decrease the high collision probability at heavy traffic load, a coalition strategy is introduced, in which the LTE-U base stations (BSs) would form into groups, and each group would contend for accessing the channel as one entity. This will effectively reduce the number of stations contending for accessing the channel and the collision probability as a result. In particular, in order to obtain the coalition solution, the cooperative game theory is introduced, and a low-complexity coalition formation algorithm is proposed based on the concept of recursive core in cooperative game. Simulation results verify the effectiveness of the proposed channel access approach, especially improving the LTE-U capacity and ensuring the fairness between LTE-U and WLAN.

关键词： Wireless LAN Games Interference IEEE 802.11 Standard Throughput Signal to noise ratio Mobile communication

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Performance Analysis of Delayed Mobile Data Offloading With Multi-level Priority

Performance Analysis of Delayed Mobile Data Offloading With ...

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IEEE Annual International Symposium on Personal, Indoor, and Mobile Radio Communications

作者： Heng Xu Xiangming Wen Zhaoming Lu Zhiqun Hu Wenpeng Jing Kun Chen Beijing Laboratory of Advanced Information Networks Beijing Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing

ISBN: (纸本)9781509032556

WiFi offloading is a cost-effective and practical solution to alleviate the problem of highly congested cellular networks. Recent theoretical and experimental studies show that delayed WiFi offloading where traffic can be delayed to increase the chance of meeting WiFi can significantly improve offloading efficiency. Nevertheless, there is no exact analytic model to analyze the offloading benefits with different types of traffic. In this paper, we propose a preemptive priority queuing analytic model for delayed offloading with multi-level priority traffic and derive expressions for the average delay and offloading efficiency of traffic with different priorities as a function of the WiFi availability, deadlines, and other key parameters. At last, we validate the accuracy of our queuing model by simulation in different scenarios and clarify how to choose a suitable deadline for traffic of different priorities.

关键词： IEEE 802.11 Standard Analytical models Queueing analysis Mobile computing Cellular networks Data models

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Resource allocation scheme based on weighted power control in cognitive radio systems

Resource allocation scheme based on weighted power control i...

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2013 International Conference on Communications, Circuits and systems, ICCCAS 2013

作者： Li, Jingye Luo, Tao Yue, Guangxin Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China State Key Laboratory of Integrated Services Networks Xidian University Xi'an China

ISBN: (纸本)9781479930517

Opportunistic spectrum access (OSA) is a promising method to improve the spectrum utilization. In this paper, we propose a weighted power control approach to further exploit the flexibility of OSA. We first give the definition and basic idea of confidence level of sub-channel idle (CLSI), then two schemes are raised to enhance the system performance considering the time-variance of channels, the accuracy of spectrum sensing and mutual interference (MI) in power-constrained cognitive radio systems. The first scheme is to maximize the system capacity, and the second one is a multi-objective optimization model for maximizing both the system capacity and the user satisfaction. Both theoretical analysis and simulation results demonstrate that scheme 1 can achieve optimal system capacity, and scheme 2 can obtain sub-optimal system capacity with optimal user satisfaction compared to the conventional algorithm. © 2013 IEEE.

关键词： Optimal systems

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Resource allocation scheme based on weighted power control in cognitive radio systems

Resource allocation scheme based on weighted power control i...

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International Conference on Communications, Circuits and systems (ICCCAS)

作者： Jingye Li Tao Luo Guangxin Yue The State Key Laboratory of Integrated Services Networks Xidian University Xi'an P. R. China Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing P. R. China

ISBN: (纸本)9781479930524

关键词： Resource management Interference Sensors Cognitive radio Power control Optimization OFDM

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Energy efficient cross-layer resource allocation scheme based on potential games in LTE-A

Energy efficient cross-layer resource allocation scheme base...

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International Symposium on Wireless Personal Multimedia Communications (WPMC)

作者： Dabing Ling Zhaoming Lu Wei Zheng Xiangming Wen Ying Ju Laboratory of Networks System Architecture and Convergence Beijing University of Posts and Telecommunications China

In wireless mobile communication system, energy saving is drawing more and more consideration both from the academia and the standardization communities. In this article, a energy efficient cross-layer resource allocation scheme for multi-cell orthogonal frequency division multiplexing (OFDM) network is proposed, and potential game is explored to guarantee the convergence of utility function with pricing. The dynamic cross-layer procedure integrates dynamic resource block (RB) allocation and energy efficiency based power allocation. Simulation results show the proposed scheme find a good balance between quality of service (QoS) satisfaction and energy consumption, and acquires significant improvements in energy efficiency, accompany with good system fairness.

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A forwarding acknowledgement based multi-hop broadcast algorithm in vehicular ad hoc networks

A forwarding acknowledgement based multi-hop broadcast algor...

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International Conference on Computer Science and Network Technology (ICCSNT)

作者： Ruina Liu Tao Luo Lei Zhang Jianfeng Li Song Fang Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China The State Key Laboratory of Integrated Services Networks Xidian University Xian China

ISBN: (纸本)9781467329637

As a fundamental element in vehicular ad hoc network, broadcast has been frequently used to exchange and disseminate messages among vehicles. In this paper, a multi-hop broadcast algorithm named forwarding acknowledgement based multi-hop broadcast (FAMB) is proposed. In this proposed algorithm, multi-hop is used to overcome the problem of limited communication range and transmit messages far away. A forwarding candidate set based on vehicles position information and a forwarding node selection mechanism are developed to overcome the broadcast storm. Only a unique forwarding node per hop along transmission direction will be assigned to rebroadcast messages to its neighbors. Two short control packets and a unit timeslot are introduced to carry out the forwarding acknowledgement and reduce the per-hop delay. In addition, over time rebroadcasting approaches in the forwarding node selection link are carried out to guarantee the transmission reliability. The simulation results confirm that FAMB mitigates the broadcast storm significantly and it also performs well in the real time and reliability of data transmission.

关键词： VANET Multi-hop broadcast Forwarding acknowledgement Candidate set Unit timeslot Spread spectrum communication data transmission V2V communication range power transmission reliability RETRANSMISSION Messages vehicle Humulus

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XY-MAC: A short preamble MAC with sharpened pauses for wireless sensor networks

XY-MAC: A short preamble MAC with sharpened pauses for wirel...

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IEEE Conference on Wireless Communications and Networking

作者： Zheng Lu Tao Luo Xiaoyan Wang Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China The State Key Laboratory of Integrated Services Networks Xidian University Xi'an China School of Electronic Engineering Beijing University of Posts and Telecommunications Beijing China

Short preamble MAC protocols such as X-MAC use a series of consecutive short preamble packets with pauses between them, which refer to as a strobed preamble. Target receiver can send an ACK packet during those pauses to stop the preamble transmission. Hence, the average length of transmitted preamble is reduced in this way, higher energy efficiency and lower latency are achieved accordingly. But with pauses longer than the transmission of an ACK packet, the sampling period at receivers is increased significantly as well, which makes it suboptimal of energy efficiency in light traffic load networks. In this paper, the XY-MAC proposes a technique called early termination to sharpen the size of those pauses. With sharpened pauses, the sampling period at receivers can be effectively reduced to acquire a high level of energy efficiency, especially under low traffic loads. A set of experiments have been held to compare with X-MAC. The results show that the duty cycle can be reduced to 37% to 65% of X-MAC under various traffic loads and bit rates.

关键词： Receivers Radio transmitters Energy efficiency Wireless sensor networks Media Access Protocol Telecommunication traffic Bit rate

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