There is provided mechanisms for enabling discovery of a collaborative proxy node in a 3GPP communication network. A method is performed by a network exposure function. The method comprises obtaining, from a content providing application function, a request for a cooperative performance enhancement service to be performed for application traffic between the application function and a user equipment, the cooperative performance enhancement service being performed by the cooperative performance enhancement node. The method comprises providing, upon having authorized the request, parameters as obtained in the request to a policy control function, thereby enabling discovery of the cooperative performance enhancement node.