Paging time adjustment in a wireless network

A base station of a first public land mobile network (PLMN) comprising:

• one or more processors;
• and
• memory storing instructions that, when executed by the one or more processors, cause the base station to:
• receive, from a wireless device, a requested international mobile subscriber identity (IMSI) offset value for offsetting an IMSI of the wireless device;
• send, to a core network node, the requested IMSI offset value;
• receive, from the core network node, an accepted IMSI offset value for offsetting the IMSI of the wireless device, wherein first paging occasions of the first PLMN are derived using an alternative IMSI determined based on a sum of:
• the IMSI of the wireless device;
• and
• the accepted IMSI offset value;
• and
• send, to the wireless device, the accepted IMSI offset value.

A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a base station of a first public land mobile network (PLMN), cause the base station to:

• receive, from a wireless device, a requested international mobile subscriber identity (IMSI) offset value for offsetting an IMSI of the wireless device;
• send, to a core network node, the requested IMSI offset value;
• receive, from the core network node, an accepted IMSI offset value for offsetting the IMSI of the wireless device, wherein first paging occasions of the first PLMN are derived using an alternative IMSI determined based on a sum of:
• the IMSI of the wireless device;
• and
• the accepted IMSI offset value;
• and
• send, to the wireless device, the accepted IMSI offset value.