https://en.wikipedia.org/wiki/List_of_LTE_networks…

Background: Why we need QoS ? There are premium subscribers who always want to have better user experience on their 4G LTE device. These users are willing to pay more for high bandwidth and better network access on their devices. Not only the subscri…

dB.dBm都是功率增益的单位,不同之处如下: dB是一个表征相对值的值,纯粹的比值,只表示两个量的相对大小关系,没有单位,当考虑甲的功率相比于乙功率大或小多少个dB时,按下面的计算公式:10log(甲功率/乙功率),如果采用两者的电压比计算,要用20log(甲电压/乙电压).[例] 甲功率比乙功率大一倍,那么10lg(甲功率/乙功率)=10lg2=3dB.也就是说,甲的功率比乙的功率大3 dB.反之,如果甲的功率是乙的功率的一半,则甲的功率比乙的功率小3 dB. dBm是一个表示功率绝对值的值…

1.doubango官网:http://www.doubango.org/ doubango常用项目国内镜像(放在淘宝的svn服务器),目前有4个项目:doubango, idoubs, imsdroid, telepresence.项目的svn地址如下格式http://code.taobao.org/svn/[项目名称]/trunk例如idoubs,可直接http://code.taobao.org/svn/idoubs/trunk,版本以最新2.0为准,去掉了1.0的代码和库,以前的svn…

1.doubango官网:http://www.doubango.org/ 2.doubango是一个开源的VOIP基础平台, 并能用于嵌入式和桌面系统的开源框架,该框架使用ANSCI-C编写,具有很好的可移植性. 3.根据doubango的框架.特点与linphone的对比,显然doubango更适合做视频会议系统和视频会议终端的选择,理由?根据linphone的rtp会话管理可见只适合2方进行视频通话,如要支持多方(>3)视频会议,需MCU配合server进行音视频转发和mix,linpho…

Modeling and Analysis of RRC-Based Signalling Storms in 3G Networks 还是使用状态机模型来做恶意UE识别 https://san.ee.ic.ac.uk/publications/ggorbil_gelenbe_TETC_15_final.pdf 看他的仿真:In the simulations, we have 1,000 UEs in an area of 2x2 km, which is covered by sevenNo…

周四,Facebook Engineering blog 发表了一篇名为<Improving Facebook on Android>博文.博文从四个方面(Performance,Data Efficiency, Networking,Application Size)讲述了Facebook是怎样优化app保证其在不同国家不同类型Android设备上都能表现出良好性能的. 因为原文内容比較 easy理解,这里就直接给出原文.以使上边链接打不开的同学也能看到.<菜鸟成长史:http://b…

Welcome Android http://code.google.com/p/imsdroid/ http://code.google.com/p/imsdroid/source/browse/#svn%253Fstate%253Dclosed 3GPP IMS (IP Multimedia Subsystem) is the next generation network for delivering IP multimedia services. IMS is standardized…

1.doubango官网:http://www.doubango.org/ 2.doubango是一个开源的VOIP基础平台, 并能用于嵌入式和桌面系统的开源框架,该框架使用ANSCI-C编写,具有很好的可移植性. 3.根据doubango的框架.特点与linphone的对比,显然doubango更适合做视频会议系统和视频会议终端的选择,理由?根据linphone的rtp会话管理可见只适合2方进行视频通话,如要支持多方(>3)视频会议,需MCU配合server进行音视频转发和mix,linpho…

Default Bearer, Dedicated Bearer... What exactly is bearer ?   While trying to get a better understanding of VoLTE and IMS , I came across bearers stuff which I thought might be useful to share with you guys. Before we talk about what default and ded…