Utran to lte (rsrvcc) handover

A method in a mobility management entity (201), MME, to allow the handover of a communication service of a user equipment (101), UE, between a circuit-switched network (100a), CS, and a network (100b) packet-switched, PS, the UE being located in the CS network and having a communications service in the CS network, the method comprising: receiving (302, 403, 502, 602, 701) a reverse single radio voice call handover request message, rSRVCC, from a mobile service switching center server (203) MSC, for handover of the user equipment (101) from the CS network to the PS network indicating that an allocation of a resource associated with the communication service is needed in the PS network (100b); sending (305, 405, 509, 608, 704) a handover request message to a base station (103), in the PS network (100b); receiving (306, 406, 509, 608, 705) from the base station (103) a handover request acknowledgment message comprising information on the allocation of resources in the PS network (100b); sending (307,407, 510, 610, 706) to the MSC server (203) a handover response message, comprising information on the allocation of resources in the PS network (100b); receiving (311, 413, 514, 614, 709) from the base station (103) a handover notification message comprising a notification that the handover from the CS network (100a) to the PS network (100b) is configured in the user equipment (101); receiving (317, 422, 506b, 606b, 713) from a service gateway (207), SGW, a dedicated bearer creation request message, comprising a request to create a dedicated bearer associated with the communication service in the PS network (100b); sending (318, 423, 506b, 606b, 714) to the UE a dedicated bearer activation request message comprising a request to activate a dedicated bearer associated with the communication service; receiving (319, 424, 506b, 606b, 715) from the UE a dedicated bearer activation response message comprising information about the activated dedicated bearer associated with the communication service; and sending (320,425, 506b, 606b, 716) to the SGW (207) a dedicated bearer creation response message comprising information about the dedicated bearer created associated with the communication service, allowing the handover of the communication service between the CS network (100a) and PS network (100b).