SGSN pool内的移动性管理问题？attach请求和响应数据包不在一个SGSN IP下？

爱卫生

绝对不可能。attach request和attach accept绝对是同一个SGSN回的。

Pool内的寻址，New SGSN寻址Old SGSN是通过Old RAI和NRI来查询DNS获取old sgsn的IP地址。但不会说attach request和attach accept是两个不同的SGSN回。

爱卫生

kangminpu 发表于 2013-12-9 11:47
Pool内SGSN的寻址不是按照NRI来的么？SGSN中会有NRI table的定义，然后New SGSN根据NRI table来查找Pool内 ...

非常感谢。已经更正错误。之前提到的是标准流程的DNS寻址，pool内的寻址的话确实还是和NRI有关的。

SGSN Pool的规范在TS23.236，相关的描述摘录如下：“

For the GTP signalling between two SGSNs supporting the Intra Domain Connection of RAN Nodes to Multiple CN Nodes the new SGSN derives the address of the old SGSN from the old RAI and the NRI contained in the old P-TMSI/TLLI. The SGSN addresses are configured in the SGSN (O&M) or in DNS for each RAI and NRI combination. If the network contains SGSNs that cannot derive the old SGSN from RAI and NRI the default SGSN per RAI as described below shall be used (e.g. to reduce the configuration effort).”