Scheduling Constraints and Interference Graph Properties for Graph-based Interference Coordination in Cellular OFDMA Networks

The currently emerging 802.16e (WiMAX) and 3GPP Long Term Evolution (LTE) cellular systems are based on Orthogonal Frequency Division Multiple Access (OFDMA). OFDMA suffers from heavy inter-cell interference if neighboring base stations use the same frequency range. One approach to solve this issue is the application of beamforming antennas in combination with interference coordination (IFCO) mechanisms between base stations. In this paper, we trace the problem of IFCO back to the graph coloring problem and investigate the achievable resource utilization of the interference coordinated system. We develop a heuristic that allows the combination of arbitrary scheduling algorithms with the IFCO mechanism. This allows an efficient utilization of the radio system’s frequency resources while still obeying scheduling constraints, such as Quality of Service requirements. Finally, we study the tradeoff between fairness and the total system throughput.

HSOPA关键技术的研究

介绍了即将被商用的HSDPA(高速下行分局接入技术)的演进技术——HSOPA(高速OFDM分组接入技术)、HSOPA技术特点及HSOPA的关键技术,并展望了HSOPA技术向后3G及4G的过渡情况。     

3GPP SA第50次会议报告

3GPPSA第50次会议于2010年12月12-16日在土耳其伊斯坦布尔召开.本文介绍了SA第50次全会的会议概况,以及各工作组的会议情况,重点介绍了3GPPSA当前讨论的热点问题,如机器类型通信,中继节点的安全问题等.     

Downlink Dimensioning for the HSDPA Standard

We present an analytic derivation of downlink dimensioning for a wireless network employing the High Speed Downlink Packet Access (HSDPA) standard [Moulsley, Conference Publication No. 477, IEE 2001], currently being developed by the 3rd Generation Partnership Project (3GPP) [http://www.3gpp.org] as part of the next stage in the evolution of the WCDMA standard. We determine the maximum possible cell radius such that the probability of outage, P_out, at the cells worst location does not exceed a preset value under full load condition. The results of the paper are presented in the form of curves obtained by numerical integration of integral expressions. The results can be used, for instance, to find the increase in cell radius achievable by a certain reduction in the threshold value of the Signal to Interference plus Noise Ratio (SINR) defining outage.Parts of this work were presented at the 2002 IEEE Wireless Personal Multimedia Communications conference (WPMC), Hawaii.Dan Avidor was born in Tel Aviv, Israel, on October 18, 1936. He received the B.Sc. degree in electrical engineering from the Technion-Israel Institute of Technology, Haifa, Israel, in 1958 and the M.Sc. and Ph.D. degrees in engineering from the University of California, Los Angeles, (UCLA) in 1970 and 1981, respectively. After completing his studies for the Ph.D. degree, he returned to Israel, where he served as a Research and Development Department Head in the Israeli defense forces. He is currently a Distinguished Member of Technical Staff in the Wireless Research Laboratory, Bell Labs, Lucent Technologies, NJ, USA. His current research interests are in adaptive arrays, signal processing, and simulation techniques for wireless systems.Sayandev Mukherjee (M92) was born in Bangalore, India in 1970. He received the Bachelor of Technology degree in electrical engineering from the Indian Institute of Technology, Kanpur, India, in 1991, and the M.S. and Ph.D. degrees in electrical engineering from Cornell University, Ithaca, NY, in 1994 and 1997, respectively. Since 1996, he has been a Member of Technical Staff in the Wireless Research Laboratory, Bell Labs, Lucent Technologies, NJ, USA. His research interests include stochastic models, wireless system simulations, and intelligent resource allocation in wireless systems.     

3G时代中国联通LBS业务发展模式探讨

3G时代LBS业务得到迅猛发展,由此对电信运营商带来了压力和挑战。本文在研究当前移动互联网LBS业务发展趋势的基础上,结合中国联通"电话导航"业务现状,提出了中国联通基于"电话导航"平台的LBS业务发展模式初步设想。     

3GPP LTE中Femtocell数据信道干扰管理策略

对3GPP LTE中针对家庭基站引入后的干扰场景进行了介绍,之后从频率资源和功率资源2个资源分配自由度对数据信道的干扰管理算法进行了分析,最后,对家庭基站在3GPP LTE版本10中的标准化方向进行分析。     

非合作定位中的WCDMA协议分析

非合作定位技术不依靠运营商网络,其定位所需的参数需要测量者自己获取。为了分析非合作定位应用在宽带码分多址（WCDMA）系统中的适应性,通过3GPP标准协议研究了在随机接入过程中携带有到达时间,到达时差,信号强度和身份识别等定位参数的载体,并且从中比较了各种定位参数提取的难易程度,比较的结果表明,到达时差相对于到达时间和信号强度可以较容易从物理随机接入信道的前缀码中提取。用户身份信息可从身份识别过程提取。     

UMTS鉴权原理及其与GSM鉴权兼容性

介绍了第三代移动通讯系统UMTS的安全体系,重点介绍UMTS的鉴权流程,鉴权原理和相关算法,并且对UMTS和GSM的鉴权兼容性进行了探讨。     

Mobile phone & PMP手持设备声学设计应用(上)

电声组件主要包含麦克风(Microphone)、受话器(Receiver)以及扬声器(Loudspeaker),要进行设备的声学设计,必需先了解电声组件的特性及相关测试标准.文中简要概述了电声组件选择要领与发展趋势,分析了电声组件于手持系统的配置要领.并详细阐述了声音测试国际标准及其测试方法.     

移动增值业务安全框架研究

分别介绍了3GPP与OMA在移动增值业务安全框架方面的研究,包括3GPPGAA的框架、内容、业务流程以及OMASEC_CF的架构与基本流程,并给出了两者的关系与区别。