Communication system, mobile terminal apparatus, local area base station and communication method

A base station apparatus comprising:

• a transmission circuit that transmits demodulation reference signals based on a given demodulation reference signal resource configuration in a given radio access scheme;
• and
• a receiving circuit that receives demodulation reference signals based on a same demodulation reference signal resource configuration as the given demodulation reference signal resource configuration in a same radio access scheme as the given radio access scheme.

A communication method for a user terminal apparatus that is able to communicate with a base station apparatus in a given radio access scheme and detects the base station apparatus and/or a different communication apparatus from the base station apparatus, the communication method comprising the steps of:

• receiving demodulation reference signals based on a given demodulation reference signal resource configuration from the base station apparatus and/or the communication apparatus, in the given radio access scheme;
• and
• transmitting demodulation reference signals based on a same demodulation reference signal resource configuration as the given demodulation reference signal resource configuration to the base station apparatus and/or the communication apparatus, in a same radio access scheme as the given radio access scheme.