A method for assisting the control of a User Terminal's, UT's,, access to an access network domain in a radio communications network, said method to be used by a Multi Radio Resource Management, MRRM, function of said communications network, said MRRM function being arranged to communicate with a first radio access network domain to which a first authorization entity, A1, authorizes UTs access, and to communicate with at least a second radio access network domain to which a second authorization entity, A2, authorizes UTs access, said method comprising the steps of: - receiving at least one radio resource information message, RRIM, from said second access network domain, said message comprising at least one parameter value, X 2, of at least one radio resource parameter, P 2, related to the traffic load and/or the radio resource consumption and/or the characteristics of at least one radio traffic channel, associated with said second access network domain, - defining a criterion, C, for granting said UT access to said second access network domain, wherein said C is a function of at least said parameter value, X 2, - establishing whether said criterion, C, is fulfilled or not for said UT, - instructing said second authorization entity, A2, that said UT is authorized to access said second access network domain if said criterion, C, is fulfilled for said UT and instructing said second authorization entity, A2, that said UT is not authorized to access said second access network domain if said criterion, C, is not fulfilled for said UT, - forming a global access policy concerning at least one UT's authorization to access said second access network domain, wherein said global policy is a function of said criterion, C, - monitoring radio resource parameter values relating to said second access network domain and/or said first access network domain and establishing the authorization status for at least said UT according to said global policy, - detecting the change of authorization status for at least said UT, according to said global policy, wherein the method is characterized by further comprising the steps of: - forming a policy update message comprising an authorization instruction, - sending said policy update message to said authorization entity application, A2, responsible for establishing whether said UT is authorized to access said second access network domain, wherein said first access network domain forms a 3GPP cellular radio network and said second access network domain forms a wireless data network according to an IEEE 802 standard. - receiving at least one radio resource information message, RRIM, from said second access network domain, said message comprising at least one parameter value, X 2, of at least one radio resource parameter, P 2, related to the traffic load and/or the radio resource consumption and/or the characteristics of at least one radio traffic channel, associated with said second access network domain, - defining a criterion, C, for granting said UT access to said second access network domain, wherein said C is a function of at least said parameter value, X 2, - establishing whether said criterion, C, is fulfilled or not for said UT, - instructing said second authorization entity, A2, that said UT is authorized to access said second access network domain if said criterion, C, is fulfilled for said UT and instructing said second authorization entity, A2, that said UT is not authorized to access said second access network domain if said criterion, C, is not fulfilled for said UT, - forming a global access policy concerning at least one UT's authorization to access said second access network domain, wherein said global policy is a function of said criterion, C, - monitoring radio resource parameter values relating to said second access network domain and/or said first access network domain and establishing the authorization status for at least said UT according to said global policy, - detecting the change of authorization status for at least said UT, according to said global policy, wherein the method is characterized by further comprising the steps of: - forming a policy update message comprising an authorization instruction, - sending said policy update message to said authorization entity application, A2, responsible for establishing whether said UT is authorized to access said second access network domain, wherein said first access network domain forms a 3GPP cellular radio network and said second access network domain forms a wireless data network according to an IEEE 802 standard.