C1=RXLEV-RXLEV_ACCESS_MIN-MAX((MS_TXPWR_MAX_CCH-P),0)
P是手机功率，规范规定是2W（33dBm）.
MX_TXPWR_MAX_CCH是手机接入CCH时可使用的最大发射功率。
MS TXPWR MAX CCH 1X00 With this parameter you define the maximum transmission power level a mobile station may use when accessing a packet control channel in the cell for GSM 1800/1900 bands.
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