1、短信架构
GSM下的短信架构图，参考3GPP TS 23.040
LTE下的短信架构图，参考3GPP TS 23.204
2、短信域选介绍
Android具体发送流程如下
参考MtkSmsDispatchersController.java 代码
protected void sendTextWithEncodingType(String destAddr, String scAddr,String text, int encodingType, PendingIntent sentIntent,PendingIntent deliveryIntent, Uri messageUri, String callingPkg,boolean persistMessage, int priority, boolean expectMore, int validityPeriod) {if (mImsSmsDispatcher.isAvailable()) {((MtkImsSm