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Reply To: RXTA- RX Level Based TCH Access


In the RX level based TCH allocation method the downlink RX level measured by the MS is used to determine whether the BTS is acceptable for TCH allocation. . TCH allocation for emergency calls is not restricted because of a too low RX level.
The minimum allowed RX level per call type is calculated as in the equation

DL_Rx_Lev(min)=C/N + DL noise level + NBL + 110.

If a downlink RX level measurement is not present, it is assumed that all call types on BCCH BTS are allowed and RX level is calculated by using the highest C/N value as in the equation

DL_Rx_Lev=C/N(max) + DL noise level + NBL + 110.