双卡双待手机DDS切换功能介绍-Toy模板网

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双卡双待手机有DSDS（Dual Sim Dual Standby）和DSDA（Dual SIM dual active）方案，早期产品使用DSDA 方案比较多，随着多模、多频段、CA、MIMO等技术出现，硬件射频复杂度大大增加，再加上双卡双通的实际使用场景并不多，DSDS就成为了目前市场的主流方案。

DSDS只有一张卡能够占有PS业务栈或Radio resource，故引入了DDS（Default Data SIM）概念。双SIM卡手机，只有一张卡能进行数据业务，称为主卡，另一张卡则称为副卡。若进行主副卡切换，则副卡切为DDS主卡；

DDS切换流程

手动DDS切换

通过setting-双卡与移动网络，选择默认上网卡。

双卡双待手机DDS切换功能介绍

DDS状态会保存在telephony的DB中，对应为Settings.Global.MULTI_SIM_DATA_CALL_SUBSCRIPTION。

可通过adb shell getprop settings list multi_sim_data_call进行查看。

frameworks/opt/telephony/src/java/com/android/internal/telephony/SubscriptionController.java

public void setDefaultDataSubId(int subId) {

enforceModifyPhoneState("setDefaultDataSubId"); String flexMapSupportType =

SystemProperties.get("persist.radio.flexmap_type", "nw_mode");

if (subId == SubscriptionManager.DEFAULT_SUBSCRIPTION_ID) {

throw new RuntimeException("setDefaultDataSubId called with DEFAULT_SUB_ID");

}

updateAllDataConnectionTrackers();

Settings.Global.putInt(mContext.getContentResolver(),

Settings.Global.MULTI_SIM_DATA_CALL_SUBSCRIPTION, subId);

broadcastDefaultDataSubIdChanged(subId);

}

DDS切换Log参考

部分log如下，主要是PS domain/pdp建立。

//Setting UI set DDS

MobileNetworkSettings: Default Data SubId [1]

//telephony-fwk subscription module detect DDS switch

SubscriptionMonitor: Default changed 1->2

SubscriptionMonitor: newDefaultDataPhoneId=1

SubscriptionMonitor: Default phoneId changed 0->1, 1,1 registrants

TelephonyNetworkFactory[0]: onDefaultChange(true,false)

TelephonyNetworkFactory[1]: onDefaultChange(false,true)

//set PS domain switch cmd to RIL

PhoneSwitcher: InformDdsToRil rild= 1, DDS=1 RILJ : [4184]> RIL_REQUEST_ALLOW_DATA allowed: false [SUB0]

RILJ : [4185]> RIL_REQUEST_ALLOW_DATA allowed: true [SUB1]

RILJ : [4184]< RIL_REQUEST_ALLOW_DATA [SUB0]

RILJ : [4185]< RIL_REQUEST_ALLOW_DATA [SUB1]

//PS domain camp on

QtiGsmDCT: [1]onDataConnectionAttached

//try setup pdp

TelephonyNetworkFactory[1]: onActivePhoneSwitch(true, true)

TelephonyNetworkFactory[1]: onReleaseNetworkFor NetworkRequest [ id=8, legacyType=-1, [ Transports: CELLULAR Capabilities: IMS&TRUSTED&NOT_VPN] ]

TelephonyNetworkFactory[0]: not releasing - isApp=false, isAct=false NetworkRequest [ id=8, legacyType=-1, [ Transports: CELLULAR Capabilities: IMS&TRUSTED&NOT_VPN] ]

RILJ : [4260]> SETUP_DATA_CALL 14 0 cmnet 0 IPV4V6 [SUB1]

RILJ : [4260]< SETUP_DATA_CALL DataCallResponse: {version=11 status=0 retry=-1 cid=0 active=2 type=IPV4V6 ifname=rmnet_data0 mtu=1500 addresses=[10.148.243.195/29] dnses=[211.136.112.50,211.136.150.66] gateways=[10.148.243.196] pcscf=[]} [SUB1]

TelephonyNetworkFactory[1]: got request NetworkRequest [ id=10, legacyType=-1, [ Transports: CELLULAR Capabilities: IMS&TRUSTED&NOT_VPN] ] with score 0

TelephonyNetworkFactory[0]: got request NetworkRequest [ id=10, legacyType=-1, [ Transports: CELLULAR Capabilities: IMS&TRUSTED&NOT_VPN] ] with score 0

TelephonyNetworkFactory[1]: onNeedNetworkFor NetworkRequest [ id=10, legacyType=-1, [ Transports: CELLULAR Capabilities: IMS&TRUSTED&NOT_VPN] ]

TelephonyNetworkFactory[0]: not acting - isApp=false, isAct=false NetworkRequest [ id=10, legacyType=-1, [ Transports: CELLULAR Capabilities: IMS&TRUSTED&NOT_VPN] ]

RILJ : [4279]> SETUP_DATA_CALL 14 2 ims 0 IPV4V6 [SUB1]

RILJ : [4279]< SETUP_DATA_CALL DataCallResponse: {version=11 status=0 retry=-1 cid=1 active=2 type=IPV4V6 ifname=rmnet_data7 mtu=1500 addresses=[2409:8804:8010:17cc:db16:6730:30b2:383c/64] dnses=[] gateways=[fe80:0000:0000:0000:e1cc:541a:ab8c:f1bf] pcscf=[]} [SUB1]

动态DDS切换

除了用户手动设置DDS外，特定的场景还可以进行DDS动态切换。

当subInfo/network request/radio state/数据开关/通话状态等改变时，都会触发onEvaluate方法，判断当前应该将DDS切换到哪张卡上。

双卡双待手机DDS切换功能介绍