| 摘要 |
In a CDMA communication network, a first signal is transmitted from a base station to a mobile station, and a reply message is transmitted from the mobile station to the base station at the timing indicated by the first signal. At the base station, the actual timing of the reply message from the mobile station is measured, and a timing signal generated by detecting the timing difference between the measured actual timing and the expected timing of the reply message from the mobile station. The timing signal is repeatedly i.e. in each frame, transmitted to the mobile station. Each mobile station comprises microphone (41) and speaker (75), encoding means (43,45) connected to the microphone, transmission means (57,59), receiving means (59,61), and decoding means (71,73). In response to a received first signal received via the receiving means at a timing indicated by a first signal, a reply signal is transmitted; and the mobile station receives a timing signal containing a delay datum (D), and adjusts the timing of the transmission signal containing an encoded transmission digital voice signal based on said delay datum. |
