Wireless communication system, communication apparatus, relay apparatus and wireless communication method

A communication device that is located in a communication target area and transmits an uplink signal to a relay device mountable on a moving body,

• the communication device comprising:
• a receptor configured to obtain a transmission permission signal from the relay device, the transmission permission signal being a signal representing transmission permission of the uplink signal;
• a transmission controller that determines an earlier transmission timing as an elevation angle of the relay device viewed from the communication device is larger on a basis of the transmission permission signal;
• and
• a transmitter that transmits the uplink signal to the relay device at the transmission timing.

A relay device that is mountable on a moving body and obtains an uplink signal from one or more communication devices located in each small area of a communication target area,

• the relay device comprising:
• a timing controller that includes a parameter that makes a transmission timing of the uplink signal earlier as an elevation angle of the relay device viewed from the communication device is larger in a transmission permission signal that is a signal representing transmission permission of the uplink signal;
• and
• a transmitter that transmits the transmission permission signal including the parameter to each small area of the communication target area in a time division manner.