[MME] Match any SGSN in same RAI if none with specific RAI+CI found #2883
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This will be useful for other procedures where only the RAI is known, but not the specific CI. This is the case of idle mobility from Gb or Iu to EUTRAN, where MME needs to request contexts based on the RAI mapped in the GUTI obtained from the UE during TAU. This also makes the config more resilient in RIM scenario, where an SGSN can be picked now even if CI doesn't match, instead of failing or faling back to the default route SGSN.
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This will be useful for other procedures where only the RAI is known, but not the specific CI. This is the case of idle mobility from Gb or Iu to EUTRAN, where MME needs to request contexts based on the RAI mapped in the GUTI obtained from the UE during TAU.
This also makes the config more resilient in RIM scenario, where an SGSN can be picked now even if CI doesn't match, instead of failing or faling back to the default route SGSN.