A method comprising: Acquiring, by a first network element providing a first cell of a cellular communication system, information about a terminal device of the cellular communication system, the first cell being a first radio access technology cell; upon determining, based on the acquired information, that the terminal device is capable of utilizing a second radio access technology-based communication, transmitting a cell addition request message to a second network element providing a second cell of the cellular communication system, the second cell being a second radio access technology cell, wherein the cell addition request message indicates that the terminal device is capable of utilizing the second radio access technology-based communication, and wherein the cell addition request message comprises an information element either indicating that the first network element schedules radio resources on a radio band of the first radio access technology for the terminal device or requesting the second network element to schedule radio resources on said radio band for the terminal device; and initiating reception of a feedback message indicating whether the second network element accepts a cell addition request indicated in the cell addition request message; characterized by: wherein if the information element of the cell addition request message indicates that the first network element schedules radio resources on said radio band for the terminal device, the method further comprising: receiving a message, from the second network element, the message requesting a permission to schedule radio resources on said radio band for the terminal device; and upon granting the permission, indicating the permission to the second network element. Acquiring, by a first network element providing a first cell of a cellular communication system, information about a terminal device of the cellular communication system, the first cell being a first radio access technology cell; upon determining, based on the acquired information, that the terminal device is capable of utilizing a second radio access technology-based communication, transmitting a cell addition request message to a second network element providing a second cell of the cellular communication system, the second cell being a second radio access technology cell, wherein the cell addition request message indicates that the terminal device is capable of utilizing the second radio access technology-based communication, and wherein the cell addition request message comprises an information element either indicating that the first network element schedules radio resources on a radio band of the first radio access technology for the terminal device or requesting the second network element to schedule radio resources on said radio band for the terminal device; and initiating reception of a feedback message indicating whether the second network element accepts a cell addition request indicated in the cell addition request message; characterized by: wherein if the information element of the cell addition request message indicates that the first network element schedules radio resources on said radio band for the terminal device, the method further comprising: receiving a message, from the second network element, the message requesting a permission to schedule radio resources on said radio band for the terminal device; and upon granting the permission, indicating the permission to the second network element. receiving a message, from the second network element, the message requesting a permission to schedule radio resources on said radio band for the terminal device; and upon granting the permission, indicating the permission to the second network element.