Mobile communications devices and methods

A method of adjusting a reference frequency of a frequency component of a first mobile communications device, wherein the first mobile communications device is configured to communicate with one or more further mobile communications devices via a wireless interface and in accordance with a communication protocol, the method comprising:

• receiving, at the first mobile communications device on the wireless interface and transmitted directly from a first device and in accordance with the communication protocol, a first synchronisation signal for timing and frequency tuning;
• adjusting, at the first mobile communications device, the reference frequency of the frequency component based on the first synchronisation signal;
• receiving, at the first mobile communications device on the wireless interface and in accordance with the communication protocol, a reference signal for channel estimation, the reference signal having been directly transmitted from another mobile communications device of the one or more further mobile communications devices to the first mobile communications device and the another mobile communications device is a separate device from the first device;
• estimating, at the first mobile communications device, a frequency offset based on the reference signal;
• and
• adjusting, at the first mobile communications device, the reference frequency of the frequency component based on the frequency offset.