| 摘要 |
<p>A method and system for use in determining the position of a mobile terminal (108) in a CDMA mobile communications system (100) is disclosed, whereby a different than usual spreading code is used when TOA measurements are being performed, but information is allowed to be transmitted while those TOA measurements are being performed. In one embodiment, the length of the different spreading code used is equal to one symbol length. In a second embodiment, a mobile terminal (108) uses a long spreading code and short spreading code prior to making TOA measurements. When TOA measurements are to be made, the serving base station (BS1) orders (204) the mobile terminal (108) to change the spreading code by terminating the use of the long code and continuing use of the short code. Alternatively, when the TOA measurements are to be made, the serving base station (BS1) orders (204) the mobile terminal (108) to substitute a second, predetermined short code for the long code being used, and to continue use of the first short code. The TOA measurements are then performed (210, 212, 214) in at least three base stations (BS1, BS2, BS3), and the position of the mobile terminal (108) is derived from this TOA information (216). The serving base station (BS1) then orders (218) the mobile terminal (108) to resume normal operations using the long code.</p> |
