基于并行运算的Mesh结构P/G网快速验证方法

提出了一个基于网络划分和分布式并行运算的P/G网快速验证方法。对于各子网运算,采用带加速子网运算策略的Cholesky分解法;并根据各子网运算相互独立的特点,采用基于MPI的并行结构对子网络运算进行分布式并行运算。实验证明,该快速验证方法在运算时间和内存占用上效果十分显著。     

基于等效电路模型的Mesh结构P/G网布线优化方法

本文在对供电用串联电阻链的等效电路模型进行详细论证的基础上，根据Mesh结构P／G网所具有的结构特点，将P／G网电阻网络加以等效变换，得到比原网络规模小得多的等效简化网络。然后用现有的布线优化方法来优化简化网络，速度可提高至少一个数量级。     

Mesh结构电源/地布线网络分析方法综述

在深亚微米VLSI设计中，获得电源／地布线网络优化设计的关键是在设计周期里对其进行有效的分析。文章在叙述Mesh结构电源／地布线网络分析模型的基础上，简要介绍了电源／地布线网络分析方法的研究进展，并指出了该研究领域存在的一些问题。     

Mesh-Tree两级层次结构P/G网布线优化方法

本文采用Mesh-Tree两级层次结构作为P／G网布线拓扑结构，并提出了一个对于该结构的线宽优化方法，使超大型P／G网的布线优化速度大大提高。     

Design and analysis of intrusion detection systems for wireless mesh networks

Intrusion is any unwanted activity that can disrupt the normal functions of wired or wireless networks. Wireless mesh networking technology has been pivotal in providing an affordable means to deploy a network and allow omnipresent access to users on the Internet. A multitude of emerging public services rely on the widespread, high-speed, and inexpensive connectivity provided by such networks. The absence of a centralized network infrastructure and open shared medium makes WMNs particularly susceptible to malevolent attacks, especially in multihop networks. Hence, it is becoming increasingly important to ensure privacy, security, and resilience when designing such networks. An effective method to detect possible internal and external attack vectors is to use an intrusion detection system. Although many Intrusion Detection Systems (IDSs) were proposed for Wireless Mesh Networks (WMNs), they can only detect intrusions in a particular layer. Because WMNs are vulnerable to multilayer security attacks, a cross-layer IDS are required to detect and respond to such attacks. In this study, we analyzed cross-layer IDS options in WMN environments. The main objective was to understand how such schemes detect security attacks at several OSI layers. The suggested IDS is verified in many scenarios, and the experimental results show its efficiency.     

Large scale P/G grid transient simulation using hierarchical relaxed approach

This paper proposes a hierarchical relaxed approach to analyze large scale on-chip power/ground (P/G) grids with C4 packages efficiently. Different from the existing hierarchical approach where macro models and time-consuming matrix density reduction technique are used, this novel approach uses an iterative relaxation procedure to explicitly exploit the character of boundary nodes caused by C4 bumps, which can lead to more speedup without losing any accuracy. Also, an efficient partition strategy is generated to help the new algorithm to achieve higher performance on C4 based P/G grid. Experimental results demonstrate that the new algorithm is as accurate as the existing hierarchical method while it delivers more speedup over it for C4 based P/G grid.     

Optimization of via distribution and stacked via in multi-layered P/G networks

The usage of via stack was not carefully studied in previous multi-layered P/G (Power/Ground) network designs. However, with feature size scaling down, the resistance of via is increasing quickly and their influence on voltage drop of P/G networks has become obvious. In this paper, two optimization techniques for via placement are proposed, which are proved to be helpful in reducing on die voltage drop. Firstly, an efficient heuristic algorithm based on sensitivity analysis is presented to optimize via distribution in early design stage. Compared with even distribution design strategies, averagely the heuristic algorithm can reduce the worst voltage drop by 8.43% without adding more vias. Secondly, experiments demonstrated that using stacked vias in nonadjacent layers is powerful in eliminating “hot” areas which suffer from large voltage drop. Based on this observation, a heuristic algorithm is developed to further reduce the worst voltage drop. Experiments show that voltage drop distribution can be well optimized by combining these two strategies together.     

农村2G/4G网络分析系统的设计与应用

中国已迈入了移动互联的新时代，目前各大运营商之间激烈的竞争聚焦在了4G网络的农村市场上。因此，研发一套农村2G/4G网络分析系统软件，有助于在山区农村复杂的无线环境中实现4G信号精准覆盖，具有一定的市场与实用价值。     

Fast analysis of bounces on power/ground planes using even-odd partition

A novel method for analyzing the bounces on structure of parallel power/ground planes by using the even-odd mode partition is presented in this paper. Based on the distributed RLCG circuit model derived from the two dimensional electromagnetic field equations of the power/ground planar structure, this method can speed up the circuit simulation of the bounces on power/ground planes by using even-odd mode partition. Furthermore, the method can be used to evaluate the effects of the terminated decoupling capacitors and the hole structures on power/ground plane. The numerical examples demonstrate that the method has both high efficiency and good precision.     

Capacity analysis of based-regular-topologies cognitive wireless mesh networks with power control

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）.     

农村2/4G网络分析系统的设计与应用

今天的中国已迈入了移动互联的新时代,目前各大运营商之间激烈的竞争聚焦在了4G网络的农村市场上。因此,研发一套农村2/4G网络分析系统软件,有助于在山区农村复杂的无线环境中实现4G信号精准覆盖,具有一定的市场与实用价值。     

6G网络智能内生的思考

面向6G时代,网络将迎来新的应用场景和新的性能需求,多样化的应用和通信场景、超异构的网络连接以及极致性能的服务需求,都对移动通信网络提出了更高的要求。在总结阐述 5G 和 5G-Advanced 网络智能化的基础上,面向6G网络给出了6G网络智能内生的定义,提出了6G网络智能内生架构的四大特征,并分析了6G网络智能内生的潜在关键技术,最后结合两个应用场景进一步探讨了智能内生架构理念。