高手给个解释阿——PVT最低限值问题

在3GPP中，关于GSM900 PVT的模版中，规定最低限值为-59dBc or -54dBm取高者 但是后面又说了一个特殊情况——except for timeslot preceding
active slot，这时候最低限值为-59dBc or -36dBm取高者。
就是上面那段英文不懂，高手给个解释阿。

对啊,中文版上好象都没有翻译这句话！疑惑！等待高手回复！

这个active slot应该怎么理解呢

这里好冷清阿，小编在吗?　
给个解释撒

The transmitted power level relative to time when sending a burst is shown in annex B. The reference level 0 dB corresponds to the output power level according to subclause 4. In the case of Multislot Configurations where the bursts in two or more consecutive time slots are actually transmitted at the same frequency, the template of annex B shall be respected during the useful part of each burst and at the beginning and the end of the series of consecutive bursts. The output power during the period between the useful parts of every two consecutive active timeslots shall not exceed the level allowed for the useful part of the first timeslot, or the level allowed for the useful part of the second timeslot plus 3 dB, whichever is the highest. As an exception, in the case of a normal burst being transmitted with a high timing advance immediately after an access burst, a minimum of 8.25 symbol guard period shall be allowed for the MS power ramping and the useful part requirements for the concerned bursts are allowed to be adjusted correspondingly. The timing of the transmitted burst is specified in 3GPP TS 45.010. Between the active bursts, the residual output power shall be maintained at, or below, the level of:
59 dBc or 54 dBm, whichever is the greater for GSM 400, GSM 900, GSM 850 and GSM 700, except for the time slot preceding the active slot, for which the allowed level is 59 dBc or 36 dBm whichever is the greater;
48 dBc or 48 dBm, whichever is the greater for DCS 1 800 and PCS 1 900;