Scheduling of device-to-device communication

A method, comprising:

• providing a direct user equipment communication toggling message by a user equipment enabled to communicate on a first frequency of a first radio system in a first radio system coverage area and as one of a direct user equipment pair on a second frequency of a second radio system;
• obtaining by the user equipment a reinterpretation message responsive to the toggling message;
• and
• reinterpreting physical layer signaling on the first frequency of the first radio system based on the reinterpretation message, wherein the user equipment is one of the direct user equipment pair and a direct user equipment communication is to be conducted on the second frequency of the second radio system in the first radio system coverage area, so that the direct user equipment pair communication on the second frequency is controlled based on the reinterpreting of the physical layer signaling on the first frequency,
• wherein the toggling message comprises a triggering message to initiate the direct user equipment communication or an exit message to terminate the direct user equipment communication.

An apparatus, comprising:

• at least one memory including computer program code;
• and
• at least one processor,
• wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus at least to
• obtain a direct user equipment communication toggling message by the apparatus enabled to communicate on a first frequency of a first radio system in a first radio system coverage area and as one of a direct user equipment pair on a second frequency of a second radio system;
• interpret physical layer signaling on the first frequency of the first radio system based on the toggling message;
• and
• schedule a direct user equipment pair communication on the second frequency of the second system in the first radio system coverage area based on the interpreting, wherein the apparatus is one of the direct user equipment pair, so that the control of the direct user equipment pair communication on the second frequency is based on the interpreting of the physical layer signaling on the first frequency,
• wherein the toggling message comprises a triggering message to initiate the direct user equipment communication or an exit message to terminate the direct user equipment communication.

An apparatus, comprising:

• at least one memory including computer program code;
• and
• at least one processor,
• wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus at least to
• provide a direct user equipment communication toggling message from a user equipment enabled to communicate on a first frequency of a first radio system in a first radio system coverage area and as one of a direct user equipment pair on a second frequency of a second radio system;
• obtain by the user equipment a reinterpretation message responsive to the toggling message;
• and
• reinterpret physical layer signaling on the first frequency of the first radio system based on the reinterpretation message, wherein the user equipment is one of the direct user equipment pair and a direct user equipment communication is to be conducted on the second frequency of the second radio system in the first radio system coverage area, so that the direct user equipment pair communication on the second frequency is controlled based on the reinterpretation message,
• wherein the toggling message comprises a triggering message to initiate the direct user equipment communication or an exit message to terminate the direct user equipment communication.