A method for wireless communications, comprising: receiving, at a first relay device, data from a first base station apparatus via a first carrier frequency in a licensed frequency band, the data to be relayed to a second apparatus; synchronizing the first relay device and a second relay device, wherein the first relay device is associated with a first operator, wherein the second relay device is associated with a second operator and a second base station apparatus, the second operator being different from the first operator, the second relay device relaying downlink transmissions received from the second base station apparatus to at least one other apparatus using an unlicensed frequency band, and wherein the synchronizing comprises: scanning, by the first relay device the unlicensed frequency band for downlink transmissions by the second relay device to determine a downlink timing of the second relay device; and synchronizing, by the first relay device, an access link timing for the transmissions of the data to the second apparatus according to the downlink timing of the second relay device to avoid interference between the first relay device and the second relay device within the unlicensed frequency band; and relaying, by the first relay device, the data to the second apparatus via a second carrier frequency in an unlicensed frequency band different than the licensed frequency band, based on the synchronization, wherein the second relay device is different than the first base station apparatus and the second apparatus, wherein the relaying is further coordinated with the second relay device using coordinated multipoint, CoMP, techniques; receiving, at the first relay device, other data from the second apparatus via the second carrier frequency in the unlicensed frequency band; and relaying the other data to the first base station apparatus via the first carrier frequency in the licensed frequency band. receiving, at a first relay device, data from a first base station apparatus via a first carrier frequency in a licensed frequency band, the data to be relayed to a second apparatus; synchronizing the first relay device and a second relay device, wherein the first relay device is associated with a first operator, wherein the second relay device is associated with a second operator and a second base station apparatus, the second operator being different from the first operator, the second relay device relaying downlink transmissions received from the second base station apparatus to at least one other apparatus using an unlicensed frequency band, and wherein the synchronizing comprises: scanning, by the first relay device the unlicensed frequency band for downlink transmissions by the second relay device to determine a downlink timing of the second relay device; and synchronizing, by the first relay device, an access link timing for the transmissions of the data to the second apparatus according to the downlink timing of the second relay device to avoid interference between the first relay device and the second relay device within the unlicensed frequency band; and scanning, by the first relay device the unlicensed frequency band for downlink transmissions by the second relay device to determine a downlink timing of the second relay device; and synchronizing, by the first relay device, an access link timing for the transmissions of the data to the second apparatus according to the downlink timing of the second relay device to avoid interference between the first relay device and the second relay device within the unlicensed frequency band; and relaying, by the first relay device, the data to the second apparatus via a second carrier frequency in an unlicensed frequency band different than the licensed frequency band, based on the synchronization, wherein the second relay device is different than the first base station apparatus and the second apparatus, wherein the relaying is further coordinated with the second relay device using coordinated multipoint, CoMP, techniques; receiving, at the first relay device, other data from the second apparatus via the second carrier frequency in the unlicensed frequency band; and relaying the other data to the first base station apparatus via the first carrier frequency in the licensed frequency band.