Temporary Logical Link Identifier -- 臨時邏輯鏈路標識.
TLLI是在MS接入GPRS網路的初始階段沒有分配P-TMSI的時候用以區分不同的MS的.
根據3GPP規範TS23.003Chapter2.6，共有四種類型的TLLI：
1）LocalTLLI
AlocalTLLIisbuiltbyaMSwhichhasavalidP-TMSIasfollows:
bits31downto30aresetto1;andbits29downto0aresetequaltobits29to0oftheP-TMSI.
2）ForeignTLLI
AforeignTLLIisbuiltbyaMSwhichhasavalidP-TMSIasfollows:
bit31issetto1andbit30issetto0;andbits29downto0aresetequaltobits29to0oftheP-TMSI.
3）RandomTLLI
ArandomTLLIisbuiltbyanMSasfollows:
bit31issetto0;bits30downto27aresetto1;andbits0to26arechosenrandomly.
4）AuxiliaryTLLI（輔助TLLI）
AnauxiliaryTLLIisbuiltbytheSGSNasfollows:
bit31issetto0;bits30downto28aresetto1;bit27issetto0;andbits0to26canbeassignedindependently.
