1. NUMBER_SENT_PACKETS_OF_HANG默认值为10，表示发送10次数据包没有响应的情况下，会触发数据业务重试机制
frameworks\opt\telephony\src\java\com\android\internal\telephony\dataconnection\DcTracker.java
// Default sent packets without ack which triggers initial recovery steps private static final int NUMBER_SENT_PACKETS_OF_HANG = 10;
2.信号格数
frameworks\base\telephony\java\android\telephony\SignalStrength.java
public int getLteLevel()
3.移动4G B34关闭
关闭B34，可用高通QCOM工具
AT+CNVW=6828,0,"95000000E00100000000000000000000"
AT+CNVW=6829,0,"95000000E00100000000000000000000"
4.QCN:Qualcomm Calibration Network高通校准网络
