Methods and devices for device-to-device communications

A method of operating a terminal device, the method comprising:

• identifying a data hopping sequence for a first superframe comprising a plurality of frames;
• obtaining scheduling data for the data hopping sequence;
• and
• transmitting and receiving while switching hopping frequencies over plurality of frames according to the data hopping sequence and the scheduling data to exclude one or more hopping frequencies scheduled for use by a synchronization hopping sequence in one or more superframes immediately succeeding the first superframe.