Methods for controlling multimode radio communications system, control server and terminal

An apparatus in communications with a multimode radio communications system, the apparatus comprising:

• a processor;
• a receiver configured to cooperate with the processor to receive control information from a control server by way of a control link between the apparatus and a control server supported by any one communications system in the multimode radio communications system, wherein the control information indicates a service communications system selected from the multimode radio communications system for supporting transmission of each service of the apparatus;
• and
• the processor is configured to
• establish a communications link for service communications system indicated in the control information for supporting transmission of each service of the apparatus, wherein the control link remains in an active state during transmission of each of the services of the apparatus;
• and
• establish or release communications systems in the multimode radio communications system for supporting the services of the apparatus according to the control information from the control server, wherein the communications system supporting the control link is different from the communications systems supporting the services.

Anon-transitory computer readable medium comprising a computer program code comprising one or more executable instructions that, when executed by one or more processors, cause the one or more processors to:

• receive control information from a control server by way of a control link between the terminal and the control server supported by any one communications system in the multimode radio communications system,
• wherein the control information indicates a service communications system selected from the multimode radio communications system for supporting transmission of each service of a terminal,
• establish a communications link for each service communications system indicated in the control information indicated in the control information for supporting transmission of each service of the terminal, wherein the control link remains in an active state during transmission of each of the services of the terminal;
• and
• establishing or releasing, by the terminal, communications systems in the multimode radio communications system for supporting the services of the terminal according to the control information from the control server, wherein the communications system supporting the control link is different from the communications systems supporting the services.