Network slice registrar virtual network function

A method of managing a plurality of associated network slices, comprising:

• building a first distributed ledger by a network slice registrar function (NSRF) application executing on a computer, where the first distributed ledger records events associated with a first network slice allocated to a user equipment (UE) and where the NSRF application provides a virtual network function (VNF) in a 5G communication network, the first distributed ledger comprising a first genesis block and at least a first non-genesis block;
• building a second distributed ledger by the NSRF application, where the second distributed ledger records events associated with a second network slice allocated to the UE, the second distributed ledger comprising a second genesis block and at least a second non-genesis block;
• building a third distributed ledger by the NSRF application, where the third distributed ledger records the association between the first network slice and the second network slice, the third distributed ledger comprising a third genesis block and at least a third non-genesis block, wherein each respective genesis block comprises a nonce value and a hash value calculated over the nonce value and content of the respective genesis block;
• receiving a notification by the NSRF application from a network slice selection function (NSSF), where the notification indicates that the second network slice is terminated;
• in response to receiving the notification, building a terminal block by the NSRF application;
• adding the terminal block by the NSRF application to the third distributed ledger, thereby closing the third distributed ledger from any further growth;
• after the third distributed ledger has been closed, auditing the third distributed ledger by the NSRF application;
• based on the auditing, generating an activity report by the NSRF application, where the activity report comprises an identity of the UE and information about the concurrent operations of the first network slice and the second network slice;
• and
• establishing a first communication link between the UE and a first call end point via the first network slice by a first user plane function (UPF) associated with the first network slice, wherein the first UPF receives information from the NSRF application about the association of the UE to the first network slice based on the information provided by the NSRF to the NSSF.