a method of facilitating radio communications involves receiving a first message from a first remote radio station on a first radio channel , transmitting the first message to a second remote radio station on a second radio channel , receiving a second message from the second remote radio station on a third radio channel , and transmitting the second message to the first remote radio station on a fourth radio channel . a method of radio communication involves receiving a first radio signal from a first remote radio station on a first radio channel , transmitting a second radio signal to the first remote radio station on a second radio channel , receiving a third radio signal from a second remote radio station on a third radio channel , and transmitting a fourth radio signal to the second remote radio station on a fourth radio channel . radio signal repeater and mobile station apparatuses are also disclosed .