MOBILE SWITCHING CENTER RESTART RECOVERY PROCEDURE

摘要

A METHOD OF RECOVERING FROM A RESTART PROCEDURE IN A MOBILE SWITCHING CENTER (MSC) IN A RADIO TELECOMMUNICATIONS NETWORK HAVING A HOME LOCATION REGISTER (HLR) THAT MAINTAINS SUBSCRIBER PROFILES AND A MSC THAT MAINTAINS TEMPORARY SUBSCRIBER RECORDS ASSOCIATED WITH THE SUBSCRIBER PROFILES IN THE HLR. THE MSC MAINTAINS THE TEMPORARY SUBSCRIBER RECORDS IN THE MSC DURING THE RESTART PROCEDURE(23), AND FLAGS EACH TEMPORARY SUBSCRIBER RECORD IN THE MSC THAT WENT THROUGH THE RESTART (24). THE HLR FLAGS EACH SUBSCRIBER PROFILE IN THE HLR THAT FAILS AN ATTEMPT TO UPDATE AN ASSOCIATED TEMPORARY SUBSCRIBER RECORD IN THE MSC DURING THE RESTART PRODUCE (22). WHEN AN ACCESS ATTEMPT IS RECEIVED IN THE MSC THAT REQUIRES USE OF A TEMPORARY SUBSCRIBER RECORD THAT IS FLAGGED, THE MSC REQUESTS THE HLR TO SEND ANY CHANGES TO THE FLAGGED TEMPORARY SUBSRCIBER RECORD (35). THE HLR THEN DETERMINES WHETHER THE SUBSCRIBER PROFILE ASSOCIATED WITH THE FLANGGED TEMPORARY SUBSCRIBER RECORD IN THE MSC IS FLAGGED IN THE HLR (36). IF THE SUBSCRIBER PROFILE IS NOT FLANGGED, THE HLR SENDS A MESSAGE TO THE MSC INDICATING THAT THERE ARE NO CHANGES TO THE FLANGGED TEMPORARY SUBSCRIBER RECORD (37). HOWEVER, IF THE SUBCRIBER PROFILE IN THE HLR IS FLAGGED, THE HLR SENDS TO THE MSC, THE CHANGES STORED IN THE FLAGGED PROFILE WHICH THEN UPDATE THE FLAGGED TEMPORARY SUBSCRIBER RECORD IN THE MSC (39). THE FLAGGED SUBSCRIBER PROFILE AND THE FLAGGED TEMPORARY RECORD ARE THEN RESET (41). (FIGURE 2A & 2B)