| 摘要 |
<p>A call admission control method which operates under a variety of conditions. When only common measurements are available, the call admission control function at the CRNC will accept or reject a request based on: common measurements of the target cell and neighboring cells; estimated common measurements after admission; and the measure of load of the target cell and neighboring cells. When no measurements are available, the call admission control function at the CRNC can accept or reject a request based on estimated load of the target cell and neighboring cells, instead of relying on UE/UTRAN measurements. The load may be estimated using the following information: 1) required signal to noise ratio (SIR) of the radio link setup/reconfiguration request; and 2) required SIR of existing CCTrCHs in the target cell and neighboring cells. Finally, the call admission control function at CRNC can accept or reject a request based on estimated outage probability of the target cell and neighboring cells based on assumption of time-variant SIR. One embodiment for estimating the outage probability is to use the following information: 1) required signal to noise ratio (SIR) and SIR range of the radio link setup/reconfiguration request; 2) required SIR and SIR range of existing CCTrCHs in the target cell and neighboring cells; and 3) outage probability can be defined as the probability that the instantaneous load in a time slot exceeds a maximum allowed value.
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