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Commit 60551b68 authored by Robert Greenwalt's avatar Robert Greenwalt
Browse files

Add a Carrier-config specific ratcheter of RATs. 

Only reports transitions to higher RATs within a given family.
Reset when we move to a new cell.
Avoids costly propogation of RAT flapping within the family,
for example every outgoing data pops us into a higher RAT and
idle time pops us back down.

bug:27360321
Change-Id: I549d79c1c74325981bee284cef452bd096184d86
parent f8142e5b

telephony/java/android/telephony/CarrierConfigManager.java

+15 −0
Original line number Diff line number Diff line
@@ -777,6 +777,16 @@ public class CarrierConfigManager { 
    /** @hide */

    public static final int CDMA_ROAMING_MODE_ANY = 2;



    /**

     * The families of Radio Access Technologies that will get clustered and ratcheted,

     * ie, we will report transitions up within the family, but not down until we change

     * cells.  This prevents flapping between base technologies and higher techs that are

     * granted on demand within the cell.

     * @hide

     */

    public static final String KEY_RATCHET_RAT_FAMILIES =

            "ratchet_rat_families";



    /** The default value for every variable. */

    private final static PersistableBundle sDefaults;
@@ -922,6 +932,11 @@ public class CarrierConfigManager { 
        sDefaults.putStringArray(KEY_SIGNAL_DCFAILURE_RECEIVER_STRING_ARRAY, null);

        sDefaults.putStringArray(KEY_SIGNAL_PCO_RECEIVER_STRING_ARRAY, null);

        sDefaults.putString(KEY_CARRIER_SETUP_APP_STRING, "");



        // Rat families: {GPRS, EDGE}, {EVDO, EVDO_A, EVDO_B}, {UMTS, HSPA, HSDPA, HSUPA, HSPAP}

        // Order is important - lowest precidence first

        sDefaults.putStringArray(KEY_RATCHET_RAT_FAMILIES,

                new String[]{"1,2","7,8,12","3,11,9,10,15"});

    }



    /**