Setting CDMA System Time Parameters

CDMA System Time Overview

The CDMA system time is the time reference used by the IS2000/IS95 (CDMA) and IS856 (1xEV-DO) system. It is synchronous to UTC (Coordinated Universal Time) time except for leap seconds and uses the same time origin as GPS (Global Positioning System) time. All base stations use the same system time and all mobile stations use the same system time, offset by the propagation delay from the base station to the mobile station.

The test set emulating a base station to allow you to set the CDMA system time parameters that are sent to the mobile station in a Sync Channel Message . The mobile station uses them to calculate its local time and verify time-based data applications, such as alarms, meeting schedules, etc. The CDMA system time is also used in multiple test sets synchronization. (See Performing Multi-Unit Synchronization )

CDMA System Time Parameters and Information

• CDMA System Time

  The CDMA system time consists of two portions: CDMA System Time (Date) and CDMA System Time (Time) which are set from the CDMA System Time Parameters menu and displays on CDMA System Time Information window.

  The CDMA system time in the test set starts at what you set (or internal RTC time when shipped from the factory) and keeps going. It is corresponding to the UTC time without the leap seconds. The CDMA system time is maintained in the test set and not affected by full preset and save/recall operations.

  The CDMA system time is updated on CDMA System Time Information window every two seconds. To get more accurate CDMA system time running in the test set, you can use CALL[:CELL]:CSTime:DATE? or CALL[CELL]:CSTime:TIME? query commands which has one second resolution.

  • CDMA System Time (Date) is the date portion of the CDMA system time and can be set any date from January 6, 1980 to January 5, 2080.
  • CDMA System Time (Time) is the time portion of CDMA system time and can be set any time of the day. The value of this setting must be an even number. Any odd number you enter is rounded up to an even number automatically.

  GPIB Command: CALL[:CELL]:CSTime:DATE and CALL[:CELL]:CSTime:TIME

• Leap Seconds

  Specifies the leap seconds that is used by CDMA Local Time calculation. It is stored in the test set's non-volatile RAM and not affected by the power cycle, full preset or Save/Recall operations.

  GPIB Command: CALL[:CELL]:CSTime:LOCal:LEAP

• Local Time Offset (hh.mm)

  Specifies the local time offset from CDMA system time. It is also used by CDMA Local Time calculation. The value of this setting must be hours or half-hours. Otherwise, the test set rounds it up the closest hour or half-hour. It is stored in the test set's non-volatile RAM and not affected by the power cycle, full preset or Save/Recall operations.

  GPIB Command: CALL[:CELL]:CSTime:LOCal:OFFSet:[SELected] or CALL[:CELL]:CSTime:LOCal:OFFSet:TA2000

• Daylight Savings Time Indicator

  Specifies whether the daylight saving time takes effect. It isn't used by CDMA Local Time calculation. It is stored in the test set's non-volatile RAM and not affected by the power cycle, full preset or Save/Recall operations.

  GPIB Command: CALL[:CELL]:CSTime:DSTime

• CDMA Local Time

  The CDMA Local Time is consists of two portions: CDMA Local Time (Date) and CDMA Local Time (Time) which are calculated based on the following formula and shown on the CDMA System Time Information window.

  CDMA Local Time = CDMA System Time (Date) + CDMA System Time (Time) - Leap Seconds + Local Time Offset

  Once the mobile station synchronizes to the test set, the time displayed on the mobile station's screen should be same as the CDMA Local Time that shown on the test set. It is used to verify whether the date displayed on the mobile station is correct.

  • CDMA Local Time (Date) is the date portion of CDMA system local time.
  • CDMA Local Time (Time) is the time portion of CDMA system local time.

  GPIB Command: CALL:STATus:CSTime:LOCal:DATE? and CALL:STATus:CSTime:LOCal:TIME?