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Differentiated-pricing based power allocation in dense femtocell networks

Differentiated-pricing based power allocation in dense femto...

引用

International Symposium on Wireless Personal Multimedia Communications (WPMC)

作者： Wenmin Ma Haijun Zhang Wei Zheng Xiangming Wen Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing China Centre for Telecommunications Research King's College London London UK

Femtocells, combined with orthogonal frequency division multiple access (OFDMA), can improve cellular coverage and offload traffics from existing macrocells. However, the co-channel deployment of femtocells is still facing challenges arising from potentially severe co-channel interference in dense femtocells. In this paper, we investigate the uplink power allocation problem in dense deployed femtocells. We first model the uplink power allocation in femtocells as a non-cooperative game, where co-channel interference is taken into account in maximizing the femtocell capacity and uplink femto-to-femto interference is alleviated by charging each femto user a price proportional to the signal to interference and noise ratio (SINR). Based on the non-cooperative game, we then devise a distributed power allocation algorithm with differentiated pricing update. Simulation results show that the proposed power allocation algorithm is not only able to provide improved capacities for femtocells, but also can improve users' fairness, as compared with existing unpriced water filling power allocation algorithm.

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MULTISTEP AHEAD PREDICTION FOR REAL-TIME VBR VIDEO TRAFFIC USING DETERMINISTIC ECHO STATE network

MULTISTEP AHEAD PREDICTION FOR REAL-TIME VBR VIDEO TRAFFIC U...

引用

2012 IEEE 2nd International Conference on Cloud Computing and Intelligence systems

作者： Xiaochuan Sun Hongyan Cui Renping Liu Jianya Chen Yunjie Liu Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications ICT Centre Commonwealth Scientific and Industrial Research Organization (CSIRO)Sydney 1710Australia

Variable bit rate (VBR) video traffic, exhibiting high self-similarity and burstiness, has been a major traffic component in high speed network. However, its complex bit rate distribution makes VBR video traffic prediction, especially multistep ahead prediction, very difficult. Recently, deterministic echo state network with adjacent-feedback loop reservoir structure (ALR) was proved to have high prediction accuracy, good memory capacity, and simple structure. In the paper, we apply ALR to real-time VBR video traffic prediction. The proposed scheme makes use of loop reservoir with identity activation function to conduct sample learning in high dimension states. Experimental results show that the simplified ALR scheme can effectively capture dynamic characteristics of VBR video traffic with less training time. Its multistep prediction accuracy is improved by 2% on average, compared with the neural network based on multi-resolution learning.

关键词： Echo state network Loop reservoir VBR video traffic Self-similarity Burstiness

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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...

引用

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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Convolutional Codes in Two-Way Relay networks with Rate Diverse network Coding

Convolutional Codes in Two-Way Relay Networks with Rate Dive...

引用

World Congress on Information and Communication Technologies

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

ISBN: (纸本)9781467348065

In two-way relay networks (TWRNs) with physical-layer network coding (PNC), introduction of convolutional codes is able to enhance the overall system reliability. In addition, the relay node has to determine a particular broadcast rate for coded packets transmission as the selected rate should be supported on the worst quality links to the intended receivers. Thus, the throughput gain brought by network coding is limited by capacity of the worst link in TWRNs. In this paper, a novel symbol-level rate diverse network coding (RDNC) scheme and reduced-state decoding scheme for convolutional codes are proposed to address the two problems. In this setup, for a given memory length constraint, two source nodes can adopt convolutional codes of different lengths and use reduced-state trellis to reduce decoding complexity. In this work, it is shown that the proposed approach is able to improve system throughput significantly, offer increased reliability, and reduce the complexity of convolutional codes decoding at the same time.

关键词： Two-way relay network Physical-layer network coding Rate diverse network coding Multiple access channel Convolutional code Viterbi algorithm Rate-diverse broadcast Wireless link quality

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A New Strategy in Asymmetric Two-User Two-Relay Wireless networks with network Coding and Hierarchical Modulation

A New Strategy in Asymmetric Two-User Two-Relay Wireless Net...

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World Congress on Information and Communication Technologies

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

ISBN: (纸本)9781467348065

In this paper, a new strategy was proposed that combining network coding with hierarchical modulation to solve the problem of asymmetry in two-user two-relay wireless networks. Hierarchical modulation was used to improve the performance of the low-priority stream and network coding was aimed at strengthening the reliability of the high-priority stream. Bit error rate (BER) was obtained to prove the correctness of the simulations. Compared with the conventional network coding scheme, it was obvious that the new strategy performed much better under additive white Gaussian noise (AWGN) channel. However under Rayleigh channel, its advantages played a dominant role in relatively lower signal-to-noise ratio (SNR) while its disadvantages leaded in higher SNR. In addition, simulations were performed to find a proper priority parameter of hierarchical modulation in accordance with the circumstances of the channels.

关键词： Hierarchical modulation (HM) network coding (NC) Asymmetric Two-user two-relay wireless network

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Sequential Analysis of the Web Access State

Sequential Analysis of the Web Access State

引用

2012 IEEE 14th International Conference on Communication Technology

作者： Minjie Guo Hao Yan Fang Liu ZhenMing Lei Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications

ISBN: (纸本)9781467321006

In the recent years,more and more researchers are likely focusing to define the dynamic behavior pattern of the web visitors and its changing regulation,rather than use the method of unitary static analysis to obtain stable and constant behavior *** this paper,the method of obtaining the web access behavior state and the sequence of the state is presented ***,according to the sequence,the statistical analysis of the web access state is ***,the result of that the state of many transferring web users is comparatively stable can be *** to the former historical data of the web access state,it can be predicted,and the theoretical basis is provided for our future research.

关键词： web access state state sequence state transition state similarity

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A Distributed TDMA-based MAC Protocol for Ad Hoc networks with Directional Antennas

A Distributed TDMA-based MAC Protocol for Ad Hoc Networks wi...

引用

International Conference on Wireless Communications and Signal Processing

作者： Dong Hao Dan Pu Liu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijng China

ISBN: (纸本)9781467358309

To improve the network capacity and reduce interference, directional antenna has been used in ad hoc networks for a long time. Due to the drawbacks of random access MAC protocols with directional antennas such as inevitable collisions, a distributed TDMA-based directional MAC protocol for ad hoc networks is proposed in this paper. It takes the advantage of real-time capability of TDMA and spatial reuse potential owing to directivity. By using the binary countdown mechanism instead of CSMA/CA, collision is completely avoided in contention stages. It offers priority services as well. The network saturation throughput and average delay are analyzed theoretically. Simulation results show that this new protocol performs better than DMAC protocol, as well as IEEE802.11 DCF and TDMA-based protocol with omnidirectional antennas.

关键词： Distributed Protocol networks

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Joint Subchannel and Power Allocation in Interference-Limited OFDMA Femtocells with Heterogeneous QoS Guarantee

Joint Subchannel and Power Allocation in Interference-Limite...

引用

IEEE Global Communications Conference

作者： Haijun Zhang Wei Zheng Xiaoli Chu Xiangming Wen Meixia Tao A. Nallanathan David Lopez-Perez Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications The University of Sheffield Department of Electronic Engineering Shanghai Jiao Tong University King's College London London UK Bell Labs Alcatel-Lucent Dublin

ISBN: (纸本)9781467309202

In this paper, we consider the joint subchannel and power allocation problem in both the uplink and the downlink for two-tier networks comprising spectrum-sharing macrocells and femtocells. A joint subchannel and power allocation scheme for co-channel femtocells is proposed, aiming to maximize the capacity for delay-tolerant users subject to delay-sensitive users' quality of service and interference constraints imposed by macrocells. The joint subchannel and power allocation problem is modeled as an mixed integer programming problem, then transformed into a convex optimization problem by relaxing subchannel sharing, and finally solved by a dual decomposition approach. The effectiveness of the proposed approach is verified by simulations and compared with existing scheme.

关键词： power splitting subchannel Femtocells Interference constraints Joints Joints TWO-LAYER Quality of service macrocells up link Convex function

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An Anti-blocking Scheme with Spatial Reuse for mm Wave Wireless networks

An Anti-blocking Scheme with Spatial Reuse for mm Wave Wirel...

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International Conference on Wireless Communications and Signal Processing

作者： Guangcan Yan Dan Pu Liu Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijng China 100876

ISBN: (纸本)9781467358309

In this paper, we investigate the two unique features of 60GHz mmWave links: inherent directivity and susceptible to blockage of human body. Due to the narrowed transmission beam of directional antenna, a moving human may cause link breakage and degradation. A fast relay selection and STDMA scheduling scheme is proposed to maintain the stability of the mmWave links and maximize the overall throughput in the presence of relay. We evaluate the anti-blocking scheme through MATLAB simulations, and compare it with existing scheduling algorithm without relay operation. The results show that the proposed scheme solves the problem of human blockage by the use of relay, and achieves high system throughput at the same time owing to the support for spatial reuse in scheduling time slots.

关键词： An Anti-blocking Scheme

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Design of QSPM-MAC: Quasi-Synchronous Priority Multi-Channel MAC Access Protocol

Design of QSPM-MAC: Quasi-Synchronous Priority Multi-Channel...

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International Conference on Wireless Communications and Signal Processing

作者： Jingye Li Jing Gao Tao Luo Guangxin Yue Beijing Key Laboratory of Network System Architecture and Convergence Beijing University of Posts and Telecommunications Beijing P.R.China.

ISBN: (纸本)9781467358309

Spectrum mobility poses a challenge to the medium access control (MAC) protocol design. This paper proposes a novel multi-channel MAC design, quasi-synchronous priority multi-channel (QSPM-MAC) protocol, for single transceiver device terminal of distributed cognitive radio networks (DCRN), presents a time frame structure consisting of spectrum sensing, channel access and data transmission, as well as the theoretical analysis framework. Depending on the different QoS requirements of different users, the proposed quasi-synchronous network access algorithm (QSNAA) euphemistically extends the contention time to increase the competitiveness of the cognitive users while solving the bidden terminal problem. The priority access policy based on super-slot commands the second position user (SPU) to abdicate to the primary position user (PPU), which reduces the collision probability. The results achieved from theoretical analysis and simulation show that the proposed protocol outperforms the existing protocol in many system performances.

关键词： Design QSPM-MAC: Quasi

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