diff --git a/core/LocApiBase.cpp b/core/LocApiBase.cpp
index e67f956b..35041f61 100644
--- a/core/LocApiBase.cpp
+++ b/core/LocApiBase.cpp
@@ -554,7 +554,7 @@ enum loc_api_adapter_err LocApiBase::
 }
 
 int LocApiBase::
-    initDataServiceClient()
+    initDataServiceClient(bool isDueToSsr)
 DEFAULT_IMPL(-1)
 
 int LocApiBase::
@@ -569,6 +569,10 @@ void LocApiBase::
     closeDataCall()
 DEFAULT_IMPL()
 
+void LocApiBase::
+    releaseDataServiceClient()
+DEFAULT_IMPL()
+
 int LocApiBase::
     setGpsLock(LOC_GPS_LOCK_MASK lock)
 DEFAULT_IMPL(-1)
diff --git a/core/LocApiBase.h b/core/LocApiBase.h
index 4655332e..2d0cc8c6 100644
--- a/core/LocApiBase.h
+++ b/core/LocApiBase.h
@@ -215,10 +215,11 @@ public:
         getBestAvailableZppFix(GpsLocation & zppLoc);
     virtual enum loc_api_adapter_err
         getBestAvailableZppFix(GpsLocation & zppLoc, LocPosTechMask & tech_mask);
-    virtual int initDataServiceClient();
+    virtual int initDataServiceClient(bool isDueToSsr);
     virtual int openAndStartDataCall();
     virtual void stopDataCall();
     virtual void closeDataCall();
+    virtual void releaseDataServiceClient();
     virtual void installAGpsCert(const DerEncodedCertificate* pData,
                                  size_t length,
                                  uint32_t slotBitMask);
diff --git a/loc_api/libloc_api_50001/LocEngAdapter.h b/loc_api/libloc_api_50001/LocEngAdapter.h
index dd308b8e..7afdd001 100644
--- a/loc_api/libloc_api_50001/LocEngAdapter.h
+++ b/loc_api/libloc_api_50001/LocEngAdapter.h
@@ -261,9 +261,9 @@ public:
     {
         return mLocApi->setLPPeProtocol(lppeCP, lppeUP);
     }
-    inline virtual int initDataServiceClient()
+    inline virtual int initDataServiceClient(bool isDueToSsr)
     {
-        return mLocApi->initDataServiceClient();
+        return mLocApi->initDataServiceClient(isDueToSsr);
     }
     inline virtual int openAndStartDataCall()
     {
@@ -277,6 +277,10 @@ public:
     {
         mLocApi->closeDataCall();
     }
+    inline virtual void releaseDataServiceClient()
+    {
+        mLocApi->releaseDataServiceClient();
+    }
     inline enum loc_api_adapter_err
         getZpp(GpsLocation &zppLoc, LocPosTechMask &tech_mask)
     {
diff --git a/loc_api/libloc_api_50001/loc_eng.cpp b/loc_api/libloc_api_50001/loc_eng.cpp
index 86be6e15..545f3eb2 100644
--- a/loc_api/libloc_api_50001/loc_eng.cpp
+++ b/loc_api/libloc_api_50001/loc_eng.cpp
@@ -186,6 +186,7 @@ static void loc_default_parameters(void)
 // 2nd half of init(), singled out for
 // modem restart to use.
 static int loc_eng_reinit(loc_eng_data_s_type &loc_eng_data);
+static void loc_eng_dsclient_release(loc_eng_data_s_type &loc_eng_data);
 static void loc_eng_agps_reinit(loc_eng_data_s_type &loc_eng_data);
 
 static int loc_eng_set_server(loc_eng_data_s_type &loc_eng_data,
@@ -2360,6 +2361,39 @@ static void loc_eng_agps_reinit(loc_eng_data_s_type &loc_eng_data)
     }
     EXIT_LOG(%s, VOID_RET);
 }
+
+/*===========================================================================
+FUNCTION    loc_eng_dsclient_release
+
+DESCRIPTION
+   Stop/Close/Release DS client when modem SSR happens.
+
+DEPENDENCIES
+   NONE
+
+RETURN VALUE
+   0
+
+SIDE EFFECTS
+   N/A
+
+===========================================================================*/
+static void loc_eng_dsclient_release(loc_eng_data_s_type &loc_eng_data)
+{
+    ENTRY_LOG();
+    int result = 1;
+    LocEngAdapter* adapter = loc_eng_data.adapter;
+    if (NULL != adapter && gps_conf.USE_EMERGENCY_PDN_FOR_EMERGENCY_SUPL)
+    {
+        // stop and close the ds client
+        adapter->stopDataCall();
+        adapter->closeDataCall();
+        adapter->releaseDataServiceClient();
+    }
+    EXIT_LOG(%s, VOID_RET);
+}
+
+
 /*===========================================================================
 FUNCTION    loc_eng_agps_init
 
@@ -2430,7 +2464,7 @@ static void createAgnssNifs(loc_eng_data_s_type& locEng) {
             }
             if (NULL == locEng.ds_nif &&
                 gps_conf.USE_EMERGENCY_PDN_FOR_EMERGENCY_SUPL &&
-                0 == adapter->initDataServiceClient()) {
+                0 == adapter->initDataServiceClient(false)) {
                 locEng.ds_nif = new DSStateMachine(servicerTypeExt,
                                                      (void *)dataCallCb,
                                                      locEng.adapter);
@@ -2964,6 +2998,12 @@ void loc_eng_handle_engine_up(loc_eng_data_s_type &loc_eng_data)
         if (loc_eng_data.internet_nif)
             loc_eng_data.internet_nif->dropAllSubscribers();
 
+        // reinitialize DS client in SSR mode
+        loc_eng_dsclient_release(loc_eng_data);
+        if (loc_eng_data.adapter->mSupportsAgpsRequests &&
+              gps_conf.USE_EMERGENCY_PDN_FOR_EMERGENCY_SUPL) {
+            loc_eng_data.adapter->initDataServiceClient(true);
+        }
         loc_eng_agps_reinit(loc_eng_data);
     }