谢谢,爱总的赐教,同意新SGSN通过NRI是否为O可以判断出MS是不是从SGSN POOL里出来。
但是后面关于Default SGSN,还是有些不同的看法:
根据TS 23.236
5.5.2 Mobility Management and Handover/Relocation
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