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Adds P25 Phase II/TDMA Sync Broadcast message (Opcode 30) used to

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synchronize timing across an FDMA control channel and a TDMA traffic
channel.
This commit is contained in:
denny
2015-12-20 18:34:58 -05:00
parent f243a27ce7
commit 137d35697e
3 changed files with 193 additions and 2 deletions
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3
src/module/decode/p25/message/tsbk/TSBKMessageFactory.java
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@@ -32,6 +32,7 @@ import module.decode.p25.message.tsbk.osp.control.SecondaryControlChannelBroadca
import module.decode.p25.message.tsbk.osp.control.SecondaryControlChannelBroadcastExplicit;
import module.decode.p25.message.tsbk.osp.control.StatusQuery;
import module.decode.p25.message.tsbk.osp.control.StatusUpdate;
import module.decode.p25.message.tsbk.osp.control.SyncBroadcast;
import module.decode.p25.message.tsbk.osp.control.SystemServiceBroadcast;
import module.decode.p25.message.tsbk.osp.control.TimeAndDateAnnouncement;
import module.decode.p25.message.tsbk.osp.control.UnitDeregistrationAcknowledge;
@@ -165,6 +166,8 @@ public class TSBKMessageFactory
return new StatusQuery( message, duid, aliasList );
case STATUS_UPDATE:
return new StatusUpdate( message, duid, aliasList );
case TDMA_SYNC_BROADCAST:
return new SyncBroadcast( message, duid, aliasList );
case SYSTEM_SERVICE_BROADCAST:
return new SystemServiceBroadcast( message, duid,
aliasList );

188
src/module/decode/p25/message/tsbk/osp/control/SyncBroadcast.java Normal file
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@@ -0,0 +1,188 @@
package module.decode.p25.message.tsbk.osp.control;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.TimeZone;
import module.decode.p25.message.tsbk.TSBKMessage;
import module.decode.p25.reference.DataUnitID;
import module.decode.p25.reference.Opcode;
import alias.AliasList;
import bits.BinaryMessage;
/**
* Sync Broadcast - used to broadcast FDMA-TDMA synchronization timestamp so
* that a subscriber unit that is time synchronized on an FDMA control channel
* is also synchronized with a TDMA traffic channel.
*/
public class SyncBroadcast extends TSBKMessage
{
public static final int US = 92;
public static final int IST = 93;
public static final int MMU = 94;
public static final int[] MC = { 95,96 };
public static final int VL = 97;
public static final int LOCAL_TIME_OFFSET_SIGN = 98;
public static final int[] LOCAL_TIME_OFFSET = { 99,100,101,102 };
public static final int LOCAL_TIME_OFFSET_HALF = 103;
public static final int[] YEAR = { 104,105,106,107,108,109,110 };
public static final int[] MONTH = { 111,112,113,114 };
public static final int[] DAY = { 115,116,117,118,119 };
public static final int[] HOURS = { 120,121,122,123,124 };
public static final int[] MINUTES = { 125,126,127,128,129,130 };
public static final int[] MICRO_SLOTS = { 131,132,133,134,135,136,137,138,
139,140,141,142,143 };
public static final int[] TSBK_CRC = { 144,145,146,147,148,149,150,151,152,
153,154,155,156,157,158,159 };
public SyncBroadcast( BinaryMessage message,
DataUnitID duid,
AliasList aliasList )
{
super( message, duid, aliasList );
}
@Override
public String getEventType()
{
return Opcode.TDMA_SYNC_BROADCAST.getDescription();
}
public String getMessage()
{
StringBuilder sb = new StringBuilder();
sb.append( getMessageStub() );
sb.append( " " + new Date( getTime() ).toString() );
sb.append( " TIME ZONE OFFSET:" + getTimeZone().toUpperCase() );
sb.append( " US:" + isUS() );
sb.append( " IST:" + isIST() );
sb.append( " MMU:" + isMMU() );
sb.append( " VL:" + isVL() );
return sb.toString();
}
/**
* Returns the time sync in java time (ie milliseconds since epoch )
*/
public long getTime()
{
Calendar cal = new GregorianCalendar();
cal.clear();
cal.setTimeZone( TimeZone.getTimeZone( "GMT" ) );
cal.set( Calendar.YEAR, getYear() );
cal.set( Calendar.MONTH, getMonth() - 1 );
cal.set( Calendar.DAY_OF_MONTH, getDay() );
cal.set( Calendar.HOUR_OF_DAY, getHours() );
cal.set( Calendar.MINUTE, getMinutes() );
cal.set( Calendar.MILLISECOND, getMilliSeconds() );
return cal.getTimeInMillis();
}
public boolean isUS()
{
return mMessage.get( US );
}
/**
* Daylight Savings Time
*/
public boolean isIST()
{
return mMessage.get( IST );
}
/**
* No idea ...
*/
public boolean isMMU()
{
return mMessage.get( MMU );
}
/**
* Millenium ...?
*/
public int getMC()
{
return mMessage.getInt( MC );
}
/**
* No idea ....
*/
public boolean isVL()
{
return mMessage.get( VL );
}
/**
* Calculates the time zone from the local time offset field.
*/
public String getTimeZone()
{
StringBuilder sb = new StringBuilder();
sb.append( mMessage.get( LOCAL_TIME_OFFSET_SIGN ) ? "-" : "+" );
int hours = mMessage.getInt( LOCAL_TIME_OFFSET );
sb.append( ( hours < 10 ? "0" : "" ) + String.valueOf( hours ) );
sb.append( ":" );
sb.append( mMessage.get( LOCAL_TIME_OFFSET_HALF ) ? "30" : "00" );
if( mMessage.get( IST ) )
{
sb.append( " DST" );
}
return sb.toString();
}
public int getYear()
{
return 2000 + mMessage.getInt( YEAR );
}
public int getMonth()
{
return mMessage.getInt( MONTH );
}
public int getDay()
{
return mMessage.getInt( DAY );
}
public int getHours()
{
return mMessage.getInt( HOURS );
}
public int getMinutes()
{
return mMessage.getInt( MINUTES );
}
public int getMilliSeconds()
{
return (int)( (double)getMicroSlots() * 7.5 );
}
/**
* Micro Slots - each uslot = 7.5 milliseconds. The value ranges 0 - 7999
* and represents 60,000 milliseconds ( 8000 x 7.5 ms). Superframes occur
* every 360 ms (48 micro-slots) on FDMA and Ultraframes occur every 4
* super frames on TDMA.
*/
public int getMicroSlots()
{
return mMessage.getInt( MICRO_SLOTS );
}
}

4
src/module/decode/p25/reference/Opcode.java
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@@ -32,7 +32,7 @@ public enum Opcode
RESERVED_1B( "RESERVED_1B ", "Reserved", 27 ),
MESSAGE_UPDATE( "MESSAGE_UPDATE ", "Message Update", 28 ),
RADIO_UNIT_MONITOR_COMMAND( "RADIO_MONITR_CMD", "Radio Unit Monitor Command", 29 ),
RESERVED_1E( "RESERVED_1E ", "Reserved", 30 ),
RESERVED_1E( "RESERVED_1E ", "Reserved", 30 ),
CALL_ALERT( "CALL_ALERT ", "Call Alert", 31 ),
ACKNOWLEDGE_RESPONSE( "ACK_RESPONSE_FNE", "Acknowledge Response - FNE", 32 ),
QUEUED_RESPONSE( "QUEUED_RESPONSE ", "Queued Response", 33 ),
@@ -50,7 +50,7 @@ public enum Opcode
UNIT_REGISTRATION_COMMAND( "UNIT_REG_COMMAND", "Unit Registration Command", 45 ),
AUTHENTICATION_COMMAND( "AUTH_COMMAND ", "Authentication Command", 46 ),
UNIT_DEREGISTRATION_ACKNOWLEDGE( "DE_REGIST_ACK ", "De-Registration Acknowledge", 47 ),
RESERVED_30( "RESERVED_30 ", "Reserved", 48 ),
TDMA_SYNC_BROADCAST( "TDMA_SYNC_BCST ", "FDMA-TDMA Sync Broadcast", 48 ),
RESERVED_31( "RESERVED_31 ", "Reserved", 49 ),
RESERVED_32( "RESERVED_32 ", "Reserved", 50 ),
RESERVED_33( "RESERVED_33 ", "Reserved", 51 ),