| 摘要 |
The following invention defines a method of monitoring the power level in an uplink (i.e. from a mobile to a fixed station) transmission direction from a fixed station to mobile stations accessing it, facilitating the optimal transmission of mobile stations without the need for a two-way link with the fixed station. The method proposed is particularly appropriate during the network accessing phase, handover procedure or one-way transmission (e.g. packet transmissions), where there is not (yet) a two-way link between the fixed and mobile station. It should be noted that, for packet transmissions, the link can be exclusively one-way, in the sense that the data-flow takes place in one direction only (e.g. uplink). Given that the command for the monitoring of power in uplink derives from the access network and excludes t he signal received from the mobile station to be monitored, the method describe d herein is particularly advantageous, although non-restrictive, for Frequency Division Duplex (FDD) frequency division radio access techniques, in which t he characteristics of the propagation channel in uplink are generally separate from those in the downlink direction (i.e. from the fixed to the mobile station). The invention is applicable to digital mobile telecommunications systems, such as for example Global Mobile Systems (GSM) and, in particular, third-generation Universal Mobile Telecommunication Systems (UMTS) access technique cellular systems, in which power monitoring fulfils an important function for the optimal use of radio resources and hence the entire system capacity.
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