2G PS traffic restricting

We don’t allow to do 100% time slots for data as power control is not there in PS hence it creates interference in RF environment. Hence we want to do data caping up to 30% of the available TCH.
We do have similar parameter in Huawei system and the description is as follows.

Parameter Name- Maximum Ratio Threshold of PDCHs in a Cell
Description- This parameter specifies the maximum ratio of PDCHs in a cell. The total number of TCHs and PDCHs available in a cell is fixed. The PDCH ratio is equal to PDCHs / (TCHs + static PDCHs). This parameter determines the proportion of PDCHs to the total number of TCHs + PDCHs.
Request you to let me know the name of similar parameter in ZTE.