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GUTI,TMSI可以统称为TIN（temp identity used in next update）,是用于临时标识UE的，在attach accept, Tau accept, Rau accept中带给UE的。The UE indicates also information elements "additional GUTI" or "additional P-TMSI" in the Attach Request, TAU or RAU Request. These information elements permit the MME/SGSN to find the already existing UE contexts in the new MME or SGSN, when the "old GUTI" or "old P-TMSI" indicate values that are mapped from other identities.