描述
隨著有中國自主知識產(chǎn)權(quán)的第三代移動通信標(biāo)準(zhǔn)TD-SCDMA商用網(wǎng)測試日趨完成,大規(guī)模的3G網(wǎng)絡(luò)即將在全國各地組建,作為組網(wǎng)的重要支撐技術(shù),測試儀的開發(fā)顯得非常重要。
對網(wǎng)絡(luò)故障進(jìn)行快速診斷并降低網(wǎng)絡(luò)中斷時(shí)間是3G信令測試系統(tǒng)的主要用途之一。當(dāng)3G系統(tǒng)發(fā)生故障時(shí),需要使用測試設(shè)備接入關(guān)鍵的信令鏈路監(jiān)測點(diǎn),并進(jìn)行協(xié)議測試和分析。通常來說,通用移動通信系統(tǒng)(universalmobiletelecommuniCAtionsystem,UMTS)網(wǎng)絡(luò)故障主要可分為2大類:UMTS的陸地?zé)o線接入網(wǎng)絡(luò)(UMTSterrestrialradioaccessnetwork,UTRAN)側(cè)故障和核心網(wǎng)(corenetwork,CN)側(cè)故障。由于3GPPR4(Release4)UTRAN的網(wǎng)絡(luò)結(jié)構(gòu)和協(xié)議同GSM系統(tǒng)相比有了較大變化,因此比較容易出現(xiàn)問題;而R4核心網(wǎng)和GSM系統(tǒng)基本相同,因此出現(xiàn)問題的概率相對較小。由于Iub和Iu接口是UTRAN中最重要的測試接口,一般來說需要同時(shí)對這2個接口進(jìn)行數(shù)據(jù)采集和關(guān)聯(lián)性分析[1-3]。
若要有效地診斷3G網(wǎng)
絡(luò)故障,網(wǎng)絡(luò)工程師需要對UMTS各接口和相關(guān)協(xié)議有較全面和深入的理解,這樣才能迅速找到存在的問題,并對其中的關(guān)鍵字段進(jìn)行分析。所有這些工作,都離不開一臺具備全面解碼、呼叫跟蹤和統(tǒng)計(jì)功能的3G信令測試設(shè)備的配合。
CDR(calldatarecord)在PSTN中表示呼叫數(shù)據(jù)記錄,現(xiàn)在延伸意思為一個完整的流程,CDR合成是上述功能的基礎(chǔ),對網(wǎng)絡(luò)中消息按信令流程進(jìn)行歸類,并用索引方式把這些消息聯(lián)系到一起,然后才便于完成諸如呼叫跟蹤和呼損統(tǒng)計(jì)等高級功能[4-5]。
我們在本文中將以TD-SCDMAUTRAN中Iub接口間的各個協(xié)議的CDR合成,多協(xié)議關(guān)聯(lián)為例,對CDR合成的方法進(jìn)行描述。該方法同樣實(shí)用于WCDMA系統(tǒng)。
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