| 摘要 |
A mobile radio communications network for communicating broadcast data to a plurality of mobile communications devices by transmitting and receiving the broadcast data via a wireless access interface includes one or more base stations for transmitting signals to and receiving signals from mobile communications devices attached to the base stations, and a relay node arranged in operation to receive a first signal representing the broadcast data transmitted by one of the base stations to the relay node via a first down-link channel of the wireless access network, and to retransmit the broadcast data as a second signal for reception by one or more of the mobile communications devices via a second channel of the wireless access network. The first channel between the relay node and the base station includes an up-link channel for transmitting signals from the relay node to the base station and a down-link channel for transmitting signals from the base station to the relay node and the base station is arranged to communicate timing advance information and the relay node is adapted to adjust a timing of the transmission of the second signal via the second channel using the timing information provided by the base station. Accordingly a single frequency network can be formed with relay nodes and base stations in which mobile communications devices can receive signals representing the broadcast data transmitted from the relay nodes and the base stations substantially contemporaneously. |
