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我从事通信行业的软件开发工作，已经超过10年，至今对信息技术仍充满热情。
我参与过GSM、WCDMA、IMS、LTE等几代网络的网元和协议的开发。我有在Linux、Windows及云计算平台上的应用开发经验。我对几种编程范式如面向过程、面向对象及函数式编程等有一定的理解。我使用过多种编程语言进行开发，如C/C++、Java、Python、Go等。同时我对互联网相关技术如HTML、CSS、Javascript等也感兴趣。我也具有一定的用R或Python进行数据分析的技能。
业余时间我喜欢看数学、文学、历史等方面的书籍。总体而言我是个热爱技术、乐于学习的技术人员。
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The differences of Circuit Maintenance Messages between BICC & ISUP
Isup:CGB,BLO,CGU,UBL,GRS,RSC,CQM,UCICBICC:CGB,CGU,GRS,RSC,CQM,UCICBICC hasnt BLO and UBL messages.原创 2008-03-15 17:17:00 · 896 阅读 · 0 评论 -
SIP DTMF
SIP DTMFSIP通常有三种支持DTMF的方式。一种是带外(out of band)，采用SIP的INFO消息。在这种情况下，DTMF数字如0,1,3等在SIP的INFO消息里携带。一种是带内(in band)，就是通过RTP中的Codec，例如G.711。SDP中Payload Type或者Codec的定义见RFC3551。不是所有的Codec都能够携带DTMF。比如G.729，因为压缩得厉害原创 2015-03-10 16:44:26 · 8090 阅读 · 0 评论 -
介绍seqChart工具
搞通信的经常需要画消息序列图（Message Sequence Chart, MSC）。Windows下的Visio和Linux下的Dia能够画很好的MSC。但有时为了方便想画纯字符的MSC。我曾经用Python写过一个简单的工具来帮助实现这样的功能，工具的名字叫seqChart原创 2011-01-11 01:31:00 · 1641 阅读 · 1 评论 -
The DNS I know
The DNS I knowDNS stands for Domain Name System or Domain Name Server. The basic usage of it is to get IP via domain name. But there are advanced usages. DNS client queries a DNS ser原创 2014-03-28 17:59:56 · 1472 阅读 · 1 评论 -
SIP TLS Notes
This article first introduces some general informations about authentication, encryption and cryptography concepts. Then TLS and GnuTLS are原创 2011-09-08 22:10:52 · 3213 阅读 · 0 评论 -
SIP Miscellaneous Excerption-CALLID
branch -- A field in VIA headers, identify a transaction. tag -- A field in FROM or TO headers, call-id -- globalunique identifier原创 2011-08-09 10:34:40 · 743 阅读 · 0 评论 -
SIP Miscellaneous Excerption-PRACK
AcronymPRACK-- Provisional Response ACKnowledgement methodPRACKSIP defines two types of responses, provisional and final. Final respon原创 2011-01-11 01:20:00 · 1063 阅读 · 0 评论 -
SIP Brief Intro
TERMSessionSession is considered an exchange of data between anassociation of participants. SIPSIP is an application-layer control原创 2011-08-09 09:24:25 · 821 阅读 · 0 评论 -
MAP_PURGE_MS service
This service is used between the VLR and the HLR to cause the HLR to mark its data for an MS so that any request for routing information for a mobile terminated call or a mobile terminated short messa转载 2008-06-10 14:06:00 · 775 阅读 · 0 评论 -
CF CDR
例如 A打B, B前转到C A产生一张MOC话单: MSISDN = A, called number = B, translated number = B B产生一张MOC（CF）话单: MSISDN = B, calling number = A(Orig Calling Number), called number = C, translated number = C C产生一张原创 2008-05-28 10:39:00 · 781 阅读 · 0 评论 -
BICC related specifications
ITU-T Q.2630 AAL2ITU-T Q.1901ITU-T Q.1902.1ITU-T Q.1902.2ITU-T Q.1902.3 Bearer independent call control protocol (CS2) and Signalling system No.7 - ISDN user part formats and codesITU-T Q.1原创 2008-04-22 17:29:00 · 806 阅读 · 0 评论 -
Some notes for Codecs and Speech Versions applied in GSM and UMTS
Reference[1]3GPP 24.008[2]3GPP 48.008[3]3GPP 26.103 Speech codec list for GSM and UMTS[4]3GPP 25.413 UTRAN Iu interface RANAP signalling[5]ITU-T Q.765.5[6]ITU-T G.722 == UMTS_AMR[7]ITU-T原创 2008-04-18 19:29:00 · 2800 阅读 · 0 评论 -
Issues about COT
Issues about COT1. AcronymCCR Continuity Check RequestCOT ContinuityIAM Initial Address MessageCLF Clear ForwardRLG Release Guard2. BackgroundThe application of the continuity chec原创 2008-04-16 14:42:00 · 981 阅读 · 0 评论 -
A brief introduction for specifications of 3GPP CS domain.
2GFrom 1995 to 1998, mobile communication remains in 2G phase.R99In 1999, 3GPP release its first edition 3G specifications, with the version number R99. 3G-R99 bring new entities UTRAN, UE, No原创 2008-04-16 14:56:00 · 776 阅读 · 0 评论 -
Issues about Circuit Pool
Issues about Circuit Pool1. AcronymTRAU Transcoder and Rate Adaptation UnitBSC Base Station ControllerBTS Base Transreceiver StationBSS Base Station SubsystemMS Mobile StationMSC Mobil原创 2008-04-16 14:45:00 · 1026 阅读 · 0 评论 -
2M E1传输告警解释
AcronymLOF : Loss of frame alignment [3]LOS: Loss of Signal [2]AIS: Alarm Indication Signal [2]RDI: Remote Defect Indication [2] Reference1. G.7042. G.775原创 2008-03-20 14:59:00 · 6351 阅读 · 0 评论 -
SIP的昨天今天明天
1999年3月，SIP的第一版RFC2543发布，她是IETF的规范。那一年的前一年1998年的12月，3GPP制定了UMTS的规范。那一年的次年2000年的三月，3GPP发布了R99版本的UMTS规范。 紧接着，3GPP在2001年的三月发布了R4版本，在2002年的六月发布了R5版本。截至现在2015年9月，3GPP制定的标准已经到R14版了。而目前SIP的最新版是第二版，由RFC3261描述。原创 2015-11-05 16:09:52 · 910 阅读 · 0 评论