杨瑞明 常永宇 杨大成
中国邮电高校学报(英文版), 2013, 20 (5). doi： 10.1016/S1005-8885(13)60082-5
In the future, the wireless communication networks can be visualized as the integration of different radio access technologies (RATs), which are referred to as heterogeneous wireless networks (HWNs). In this paper, the traffic split scheme in the HWNs integrating the long term evolution (LTE) and the high speed downlink packet access (HSDPA) networks is investigated. Assuming that the networks can support multi-homing access and the user can be served by both networks simultaneously, the traffic split problem is described as an optimization problem with the aim of maximizing the throughput. By solving the problem, the dynamic traffic split scheme is proposed. The split ratios in the scheme should be proportional to the transmission rates in theory, which are hard to be described in the closed forms. Then the adaptive algorithm is proposed to obtain the split ratios. Simulation results show that the scheme with the adaptive algorithm provides better performance than the scheme without it over the additive white Gaussian noise (AWGN) fading channel and Rayleigh fading channel.
敖乃翔 徐赢颖 黄丹 ZHAO Yong-xiang 陈常嘉
中国邮电高校学报(英文版), 2013, 20 (5). doi： 10.1016/S1005-8885(13)60083-7
Distributed cloud architecture which consists of many cloud computing-storage resources (CCSRs) distributed across a geographic large-area has been widely implemented. It has received significant attention from academia. However, little effort has been taken to examine changes in operating cost-structure brought by distributed cloud scheme, or explore how to reap economic benefits from its geo-diversity. To tackle such issue, this paper formulated cost optimizations for cloud platforms based on a generic expense model of distributed cloud, taking into account major components of operating cost. The best deployment schemes were obtained through numerical simulation. The optimal amount of edge CCSRs and their corresponding placements were found to be determined by the ratio among various overhead components. Both model study and numerical simulation shed light on practical deployment of distributed cloud with high cost-effectiveness.
中国邮电高校学报(英文版), 2013, 20 (5). doi： 10.1016/S1005-8885(13)60084-9
This paper details on the uplink scheduling algorithm for long term evolution advanced (LTE-A) system with relays. While emulating quality of service (QoS)-aware services with different bit-rate and delay budget requirements for the upstream direction, a new QoS-aware scheduling algorithm for in-band relays is proposed. In this work, an improved scheduling metric calculation method and bit-rate guarantee scheme is applied. Moreover, this algorithm proposes an efficient scheme for the backhaul link allocation which allows information of the most backlogged users to be transmitted first. Finally, this paper concludes with simulation results to demonstrate how the proposed resource allocation strategy improves the performance of the system.
张岩 黄韬 刘江 陈建亚 刘韵洁
中国邮电高校学报(英文版), 2013, 20 (5). doi： 10.1016/S1005-8885(13)60085-0
Content center networking (CCN) is one of the most promising future network architectures. Current researches on CCN routing scheme mainly focus on finding the best single routing path, which may induce to low usage of the in-network caches. In order to overcome this problem, a reverse trace routing (RTR) scheme is proposed in this paper, in which Interest packet is sent to the edge-cache along with the reverse trace of the corresponding former Data packet. By doing this, the Interest packets will have better chances to be routed to the promising in-network caches before reaching the source server, which could increase the in-network hit rate, while decrease the server stress. The simulation results show clearly that the RTR scheme decreases the source server load, while reducing the mean hops of entire data retrieval process under certain circumstances.
中国邮电高校学报(英文版), 2013, 20 (5). doi： 10.1016/S1005-8885(13)60086-2
With the feature size of semiconductor technology reducing and intellectual property (IP) cores increasing, on-chip interconnection network architectures have a great influence on the performance and area of system-on-chip (SoC) design. Focusing on trade-off performance, cost and implementation, a regular network-on-chip (NoC) architecture which is mesh-connected rings (MCR) interconnection network is proposed. The topology of MCR is simple, planar and scalable in architecture, which combines mesh with ring. A detailed theoretical analysis for MCR and mesh is given, and a simulation analysis based on the virtual channel router with wormhole switching is also presented. The results compared with the general mesh architecture show that MCR has better performance, especially in local traffics and low loads, and lower cost.
张乾燕 WANG Ru-chuan SHA Chao HUANG Hai-ping
中国邮电高校学报(英文版), 2013, 20 (5). doi： 10.1016/S1005-8885(13)60087-4
In this paper, a clustering algorithm is proposed based on the high correlation among the overlapped field of views for the wireless multimedia sensor networks. Firstly, by calculating the area of the overlapped field of views (FoVs) based on the gird method, node correlations have been obtained. Then, the algorithm utilizes the node correlations to partition the network region in which there are high correlation multimedia sensor nodes. Meanwhile, in order to minimize the energy consumption for transmitting images, the strategy of the cluster heads election is proposed based on the cost estimation, which consists of signal strength and residual energy as well as the node correlation. Simulation results show that the proposed algorithm can balance the energy consumption and extend the network lifetime effectively.
方超 黄韬 刘江 CHEN Jian-ya 刘韵洁
中国邮电高校学报(英文版), 2013, 20 (5). doi： 10.1016/S1005-8885(13)60088-6
One of the key research fields of content-centric networking (CCN) is to develop more efficient cache replacement policies to improve the hit ratio of CCN in-network caching. However, most of existing cache strategies designed mainly based on the time or frequency of content access, can not properly deal with the problem of the dynamicity of content popularity in the network. In this paper, we propose a fast convergence caching replacement algorithm based on dynamic classification method for CCN, named as FCDC. It develops a dynamic classification method to reduce the time complexity of cache inquiry, which achieves a higher caching hit rate in comparison to random classification method under dynamic change of content popularity. Meanwhile, in order to relieve the influence brought about by dynamic content popularity, it designs a weighting function to speed up cache hit rate convergence in the CCN router. Experimental results show that the proposed scheme outperforms the replacement policies related to least recently used (LRU) and recent usage frequency (RUF) in cache hit rate and resiliency when content popularity in the network varies.
高军军 张建华 陶小峰
中国邮电高校学报(英文版), 2013, 20 (5). doi： 10.1016/S1005-8885(13)60089-8
In presence of line-of-sight (LOS) propagation, multiple-input multiple-output (MIMO) systems can achieve maximum capacity over the whole signal-to-noise ratio (SNR) region by deploying reconfigurable antenna arrays. In this paper, the moment generating function (MGF) formulas of the mutual information (MI) is obtained for LOS MIMO systems with reconfigurable arrays. Then the exact expression of the mean MI is derived in an easily evaluated form. The results show an excellent match between the theoretical curves and the Monte-Carlo simulations.
赵培 张需溥 杨大成
中国邮电高校学报(英文版), 2013, 20 (5). doi： 10.1016/S1005-8885(13)60090-4
Nowadays, more carriers and components are used in cellular networks to satisfy the requirement of high-speed data service. The increase of carriers and components may result in serious problem of passive inter-modulation (PIM). This paper investigates the superposition effect of 3rd-order and 5th-order PIM under multicarrier scenarios with the channelized scheme (CS) and the multiplexed scheme (MS). We use the concept of ‘effective hit’ and the cumulative inter-modulation factors (CIFs) to evaluate the cumulative PIM product strength on each individual carrier within the receive signal band. Furthermore, with the simulator based on Monte-Carlo method, the group inter-modulation factor (GIF) is calculated to measure the average superposition effect for multiple carriers compared with the benchmark case. The simulation results show that, compared with the CS, the strength of PIM product with the MS does not increases so greatly with the growth of the total number of the carriers. The results are useful for the component designers and the cellular network planners.
王冬宇 王晓湘 WANG Yu-long
中国邮电高校学报(英文版), 2013, 20 (5). doi： 10.1016/S1005-8885(13)60091-6
In this paper, a multicast concept for device-to-device (D2D) communication underlaying a cellular infrastructure is investigated. To increase the overall capacity and improve resource utilization, a novel interference coordination scheme is proposed. The proposed scheme includes two steps. First, in order to mitigate the interference from D2D multicast transmission to cellular networks (CNs), a dynamic power control scheme is proposed that can determine the upper bound of D2D transmitter power based on the location of base station (BS) and areas of adjacent cells from the coverage area of D2D multicast group. Next, an interference limited area control scheme that reduces the interference from CNs to each D2D multicast receiver is proposed. The proposed scheme does not allow the coexistence of cellular user equipments (CUEs) located in the interference limited area to reuse the same resources as the D2D multicast group. From the simulation results, it is confirmed that the proposed schemes improve the performance of the hybrid system compared to the conventional ways.
寇科昊 唐碧华 刘凯明 马涛
中国邮电高校学报(英文版), 2013, 20 (5). doi： 10.1016/S1005-8885(13)60092-8
Capacity analysis is a fundamental and essential work for evaluating the performance of cognitive wireless mesh network (CWMN) which is considered a promising option for the future network. Power control is an efficient way to avoid interference and improve capacity of wireless mesh networks. In this paper, a quantitative result of the per-node average throughput capacity of CWMN with power control is deduced for the first time, which is much helpful for understanding the limitations of CWMN. Firstly, under the large-scale channel fading model and protocol interference model, a closed-form expression for the maximum channel capacity of each node with power control is presented, under the constraint that the interference tolerated by the primary users (PUs) does not exceed a threshold. And then, with the deduced channel capacity result, the per-node average throughput capacity of CWMN is derived based on two regular topologies, i.e. square topology and triangle topology. The simulation results indicate that the capacity is effectively improved with power control, and affected by topology, tolerated interference threshold, the number of cognitive users (CUs) and primary users (PUs).
刘健 李曦 纪红 张晓亮
中国邮电高校学报(英文版), 2013, 20 (5). doi： 10.1016/S1005-8885(13)60093-X
Orthogonal frequency division multiplexing (OFDM) which has been adopted in the long-term evolution (LTE) system can improve the system capacity obviously. However, it also brings about severe inter-cell interference (ICI) for cell-edge users (CEUs). To tackle this problem, multi-user selection and power control (MuS-PC) is proposed as an efficient scheme in uplink coordinated multi-point multi-user multi-input multi-output (CoMP-MU-MIMO) transmission/reception. This paper jointly considers user’s signal to interference plus noise ratio (SINR) and proportional fairness (PF) to maximize the total channel capacity in multi-user selection by formulating a penalty function. To simplify the penalty function’s computation, particle swarm optimization (PSO) algorithm is introduced. In addition, power control is adopted to maximize overall energy efficiency. Simulation results demonstrate that the MuS-PC scheme can not only obtain the optimal total channel capacity while guarantee each user’s quality of service (QoS) and PF, but also largely reduce computational complexity and improve energy efficiency. As a result, the poor communication quality of CEUs can be enhanced.
陈凯 万文强 李云
中国邮电高校学报(英文版), 2013, 20 (5). doi： 10.1016/S1005-8885(13)60094-1
Privacy preserving data mining algorithms are crucial for the personal data analysis, such as medical and financial records. This paper focuses on feature selection and proposes a new privacy preserving distributed algorithm, which can effectively select features based on differential privacy and Gini index under the MapReduce framework. At the same time, the theoretic analysis for privacy guarantee is also presented. Some experiments are conducted on bench-mark datasets, the simulation results indicate that during the selection of important features, the proposed algorithm can preserve privacy information to a certain extent with less time cost than on centralized counterpart.
庄陵 计翔 邵凯 王光宇
中国邮电高校学报(英文版), 2013, 20 (5). doi： 10.1016/S1005-8885(13)60095-3
A novel and efficient technique to design modulated discrete Fourier transform (DFT) filter banks is introduced in this paper. The proposed method first relaxes the limits that the synthesis filters are the time-reversed version of the analysis filters and then adopts the time domain formula of the perfect reconstruction property as the solution to design the synthesis filters. The prototype filter in analysis filter banks is designed based on Fourier-Kaiser window approach. Simulation results show that the designed filter banks approximately satisfy the perfect reconstruction with controllable reconstruction errors.
乔媛媛 雷振明 袁仑 郭敏杰
中国邮电高校学报(英文版), 2013, 20 (5). doi： 10.1016/S1005-8885(13)60096-5
Offline network traffic analysis is very important for an in-depth study upon the understanding of network conditions and characteristics, such as user behavior and abnormal traffic. With the rapid growth of the amount of information on the Internet, the traditional stand-alone analysis tools face great challenges in storage capacity and computing efficiency, but which is the advantages for Hadoop cluster. In this paper, we designed an offline traffic analysis system based on Hadoop (OTASH), and proposed a MapReduce-based algorithm for TopN user statistics. In addition, we studied the computing performance and failure tolerance in OTASH. From the experiments we drew the conclusion that OTASH is suitable for handling large amounts of flow data, and are competent to calculate in the case of single node failure.
韩挺 罗守山 朱洪亮 辛阳
中国邮电高校学报(英文版), 2013, 20 (5). doi： 10.1016/S1005-8885(13)60097-7
This paper presents a novel trust model based on multiple decision factor theory (MDFT) and a trust routing algorithm based on MDFT to exactly evaluate routing node trust and establish a trustworthy routing path. MDFT integrates four dimensional trust decision factors including behavior, state, recommend and node liveness to realize an exactly finer-grained trust evaluation. On the basis of MDFT, a trust routing algorithm is presented and validated in open shortest path first (OSPF) protocol. Simulation results show that the algorithm can reflect the routing node trust accurately and has better dynamic response ability. Under the circumstance of existing deceptive nodes, the algorithm has better anti-deception performance and higher attack node detection rate than conventional algorithm.
曲志坚 XIE Yin-bao WANG Ju-hui LIU Xiao-hong
中国邮电高校学报(英文版), 2013, 20 (5). doi： 10.1016/S1005-8885(13)60098-9
Network coding brings many benefits for multicast networks. It is necessary to introduce network coding into optical networks. Nevertheless, the traditional network coding scheme is hard to be implemented in optical networks because of the weak operation capability in photonic domain. In the paper, we focused on realizing two-channel network coding in all-optical multicast networks. An optical network coding scheme which can be realized via logic shift and logic XOR operations in photonic domain was proposed. Moreover, to perform the network coding scheme the coding node structure was designed and the operation principle and processes were illustrated in detail. In the end of the paper, the performance and the cost of different all-optical multicast mode were compared and analyzed.
蒲鑫 田小建 翟红艺 乔良 刘春艳 崔艳群
中国邮电高校学报(英文版), 2013, 20 (5). doi： 10.1016/S1005-8885(13)60099-0
A reforming dynamic system based on the single-ring erbium-doped fiber laser is proposed in this paper. The reforming system has larger Lyapunov exponent and better pseudorandom characteristics according to the simulation results. It is promising in the application of the image encryption and secret communication.
中国邮电高校学报(英文版), 2013, 20 (5). doi： 10.1016/S1005-8885(13)60100-4
Support vector machines (SVMs) have shown remarkable success in many applications. However, the non-smooth feature of objective function is a limitation in practical application of SVMs. To overcome this disadvantage, a twice continuously differentiable piecewise-smooth function is constructed to smooth the objective function of unconstrained support vector machine (SVM), and it issues a piecewise-smooth support vector machine (PWESSVM). Comparing to the other smooth approximation functions, the smooth precision has an obvious improvement. The theoretical analysis shows PWESSVM is globally convergent. Numerical results and comparisons demonstrate the classification performance of our algorithm is better than other competitive baselines.