（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。
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