RAU时延超大

爱卫生

（本贴内容转载自百度文库。付10百度财富币购买。）

RAU时延超过5000ms的RAU请求均出现较大比例的Identity request和xid消息，由此看见出现Identity request 和XID消息是造成RAU时延长的另一个主要原因。

对于RAU期间出现的Identify Request消息的原因是由于SGSN开启了如下特性导致：

LICENCE CODE:..............SG00645

LICENCE NAME:..............SG6 IMEISV in CDR (10ksub)

LICENCE FILE NAME:.........F0902607

SERIAL NUMBER:.............6944208949364

ORDER IDENTIFIER:..........1101928193

CUSTOMER ID:...............203459

CUSTOMER NAME:.............*****

TARGET NE TYPE:............SGSN

TARGET ID:.................940853

LICENCE STATE:.............ACTIVE UNLIMITED

START DATE:................2009-02-24

EXPIRATION WARNING PERIOD:.30

由于上述流程的增加，从而严重增加了RAU的时延，归根结底的原因是在InterSGSN RAU的过程中不能有效的从老的SGSN传递给新SGSN IMEISV信息。在3GPP 29.060 Rel5之后在SGSN-Context Response消息中增加了一个IE来进行SGSN间的IMEISV消息传递： Container contains one or several optional information elements as described in the clause 'Overview', from the clause 'General message format and information elements coding' in 3GPP TS 24.008 [5]. The IMEISV shall, if available, be included in the Container. The IMEISV is included in the Mobile identity IE. 而诺西SGSN 在SG7中通过SG01184 IMEI transfer in SGSN change特性提供了对此规范的支持。