A method, in a first eNodeB, for coordinating eNodeB transmissions in a wireless communication network, the method comprising: generating a coordination signal for use by a second eNodeB in coordinating time-division-duplexing, TDD, wireless transmissions by the first eNodeB and the second eNodeB; and transmitting the coordination signal to the second eNodeB, in a TDD subframe, wherein: a) TDD frames in the wireless communication network comprise special subframes, the special subframes including a downlink portion, an uplink portion, and a guard period portion, and wherein said transmitting the coordination signal to the second eNodeB comprises transmitting the coordination signal during the guard period portion of a special frame at the second eNodeB, or during the uplink portion of a special frame at the second eNodeB, or during a downlink portion of a special frame at the second eNodeB in which the second eNodeB is known to be not transmitting; or b) said transmitting the coordination signal to the second eNodeB comprises transmitting the coordination signal during an uplink subframe at the second eNodeB or during a downlink subframe at the second eNodeB during which the second eNodeB is known to be not transmitting. generating a coordination signal for use by a second eNodeB in coordinating time-division-duplexing, TDD, wireless transmissions by the first eNodeB and the second eNodeB; and transmitting the coordination signal to the second eNodeB, in a TDD subframe, wherein: a) TDD frames in the wireless communication network comprise special subframes, the special subframes including a downlink portion, an uplink portion, and a guard period portion, and wherein said transmitting the coordination signal to the second eNodeB comprises transmitting the coordination signal during the guard period portion of a special frame at the second eNodeB, or during the uplink portion of a special frame at the second eNodeB, or during a downlink portion of a special frame at the second eNodeB in which the second eNodeB is known to be not transmitting; or b) said transmitting the coordination signal to the second eNodeB comprises transmitting the coordination signal during an uplink subframe at the second eNodeB or during a downlink subframe at the second eNodeB during which the second eNodeB is known to be not transmitting. a) TDD frames in the wireless communication network comprise special subframes, the special subframes including a downlink portion, an uplink portion, and a guard period portion, and wherein said transmitting the coordination signal to the second eNodeB comprises transmitting the coordination signal during the guard period portion of a special frame at the second eNodeB, or during the uplink portion of a special frame at the second eNodeB, or during a downlink portion of a special frame at the second eNodeB in which the second eNodeB is known to be not transmitting; or b) said transmitting the coordination signal to the second eNodeB comprises transmitting the coordination signal during an uplink subframe at the second eNodeB or during a downlink subframe at the second eNodeB during which the second eNodeB is known to be not transmitting.