Signal level enhanced network selection at switch-on or recovery from lack of coverage

Abstract

Method and apparatus are provided for automatic network selection at switch-on or recovery from loss of coverage. In one novel aspect, during network selection upon UE switch on or recovery from lack of coverage, the UE sets the priority of a Public Land Mobile Network (PLMN) broadcasting disaster related indication to be absolutely lower than other PLMNs no matter the received signal strength or quality of the corresponding PLMN. The UE, supporting Signal level Enhanced Network Selection (SENSE) for network selection, performs an automatic network selection procedure using an obtained SENSE threshold. The UE detects a first PLMN (not offering disaster services) with a first signal level below the SENSE threshold, and a second PLMN offering disaster services with a second signal level above the SENSE threshold. The UE prioritizes the first PLMN over the second PLMN when the UE receives a disaster indication from the second PLMN.