MTK手机信号显示计算.doc

从底层物理信号参数，到上层信号格显示的流程大致是：modem底层信号数据modem L4中转化为signal_level在AP端将signal_level映射成信号格数。下面分别介绍MTK提供的默认信号格算法：1、GSM网络a modem底层上报信号参数RSSI给modem L4b在modem L4中，用RSSI经过计算,得到上报给上层的asu值，asu的范围是0-31，计算公式为：asu = (113 + RSSI) / 2c在AP端将asu值转化为信号格数。2、 WCDMA网络a modem底层上报信号参数RSCP与Ec/No两个参数给modem L4b在modem L4中，经过计算得到上报给上层的signal_level，也即asu，asu的范围是0-31，计算公式为：signal_level = (Ec/N0 + 25) + (RSCP + 120) / 8还要加上约束条件：3、 TD-SCDMA网络a modem底层上报信号参数RSCP参数给modem L4b在modem L4中，经过计算得到上报给上层的level，也即asu，asu的范围是0-31，计算公式为：上面计算所得的level即为asu。c在AP端将asu值转化为信号格数。4.LTE网络amodem底层上报信号参数给modem L4b在modem L4中，根据各type计算出signal_level,然后上报给上层的level(即：RSSI或RSCP或RSRQ或RSRP值(单位:qdbm值)，计算公式为：kal_uint8 signal_level;/kal_int32 raw_in_dbm = (raw_in_qdbm / 4);if (type = L4_GERAN_RXLEVEL) if (raw_in_qdbm = 1) signal_level = 99; else if (raw_in_qdbm = -192) signal_level = 63; else signal_level = (raw_in_qdbm + 444) 2; else if (type = L4_GERAN_BER) if (raw_in_qdbm = 0 & raw_in_qdbm = 7) signal_level = raw_in_qdbm; else signal_level = 99; else if (type = L4_UTRA_RSCP) if (raw_in_qdbm = 1) signal_level = 255; else if (raw_in_qdbm = -100) signal_level = 96; else signal_level = (raw_in_qdbm + 484) 2; else if (type = L4_UTRA_ECNO) if (raw_in_qdbm = 1) signal_level = 255; else if (raw_in_qdbm = 0) signal_level = 49; else signal_level = (raw_in_qdbm 1) + 49; else if (type = L4_EUTRA_RSRQ) if (raw_in_qdbm = 1) signal_level = 255; else if (raw_in_qdbm = -12) signal_level = 34; else signal_level = (raw_in_qdbm 1) + 40; else if (type = L4_EUTRA_RSRP) if (raw_in_qdbm = 1) signal_level = 255; else if (raw_in_qdbm = -176) signal_level = 97; else signal_level = (raw_in_qdbm + 564) 2; return signal_level;/针对CESQ指令,signal_level的计算方法：kal_uint8 custom_signal_strength_raw_to_cesq_level(l4_cesq_param_enum type, kal_int32 raw_in_qdbm) kal_uint8 signal_level; /kal_int32 raw_in_dbm = (raw_in_qdbm / 4); if (type = L4_GERAN_RXLEVEL) if (raw_in_qdbm = 1) signal_level = 99; else if (raw_in_qdbm = -192) signal_level = 63; else signal_level = (raw_in_qdbm + 444) 2; else if (type = L4_GERAN_BER) if (raw_in_qdbm = 0 & raw_in_qdbm = 7) signal_level = raw_in_qdbm; else signal_level = 99; else if (type = L4_UTRA_RSCP) if (raw_in_qdbm = 1) signal_level = 255; else if (raw_in_qdbm = -100) signal_level = 96; else signal_level = (raw_in_qdbm + 484) 2; else if (type = L4_UTRA_ECNO) if (raw_in_qdbm = 1) signal_level = 255; else if (raw_in_qdbm = 0) signal_level = 49; else signal_level = (raw_in_qdbm 1) + 49; else if (type = L4_EUTRA_RSRQ) if (raw_in_qdbm = 1) signal_level = 255; else if (raw_in_qdbm = -12) signal_level = 34; else signal_level = (raw_in_qdbm 1) + 40; else if (type = L4_EUTRA_RSRP) if (raw_in_qdbm = 1) signal_level = 255; else if (raw_in_qdbm = -176) signal_level = 97; else