| CPC H04W 4/08 (2013.01) | 14 Claims |

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1. A service proxy apparatus, comprising:
at least one processor, and
at least one memory including a computer program code which, when executed by the at least one processor, causes the service proxy apparatus at least to perform:
receiving, from a network entity, a request for a service provided by a service function entity in a network system, wherein the request indicates an identity of a user device for which the service is requested,
determining, based on the identity of the user device indicated by the request, an identity of a group of service functions configured to provide the service to the user device, and
sending, to the network entity, in a header of a service response message to the request for service, an indication of the identity of the group of service functions for subsequent use by at least one of a sender of the request or at least one other entity involved in requests for service associated with the user device, wherein the header comprises a header configured for use as a 3rd Generation Partnership Project (3GPP) Service Based Interface (SBI) header, and wherein the header is configured as 3gpp-Sbi-Target-Nf-Group-Id” “:” OWS “nfgid=” nfGroupIdvalue, and nfgid indicates the identity of the group of service functions.
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