Radio Time Zone and Daylight Saving Time Feature Description

Radio Time Zone and Daylight Saving Time Feature Description

MSOFTX3000V100R005C01

Issue1.00

Date2007-05-31

confidential

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About This DocumentAuthorPrepared byZhu JingliDate2006-03-03

Reviewed byDate

Approved byDate

HistoryIssueDetailsDateAuthorApproved by

1.00First release2006-03-03Zhu Jingli

1.01Revised according to test result2006-03-25Zhu Jingli

1.02R005 Version Release Feature Guide2006-07-05Ding Lidan

Contents11 Radio Time Zone and Daylight Saving Time

11.1 About This Chapter

11.2 Introduction to Feature

11.2.1 Time Zone

21.2.2 DST

21.3 Working Principle

31.4 Benefits

31.4.1 Benefits to Carriers

31.4.2 Benefits to Mobile Subscribers

31.5 Availability

31.5.1 Applicability

31.5.2 Requirement for Software

41.5.3 Requirement for Hardware

41.6 Service Flow

41.7 Data Configuration

41.7.1 Data Configuration on the MSOFTX3000

51.7.2 Sample Configuration

61.8 Operations

61.8.1 Operations by Carriers

61.8.2 Operations by Subscribers

61.9 Service Interaction

61.9.1 Influence on NMS

61.9.2 Influence on CDR, Statistics and Charging System

Figures2Figure 1-1 Time synchronization among NTP Server, BAM and device

4Figure 1-2 Time icon

5Figure 1-3 Automatically adjust clock for daylight saving changes

Tables3Table 1-1 DST alarms

5Table 1-2 Procedure

1 Radio Time Zone and Daylight Saving Time1.1 About This ChapterThis chapter introduces the feature of time zone and Daylight Saving Time (DST), including the following contents: Introduction to Feature Working Principle Availability Service Flow Data Configuration Operations Service Interaction1.2 Introduction to Feature

1.2.1 Time ZoneTime zones are the 24 longitudinal divisions of Earth's surface. Based on the Greenwich meridian, the time zone of GMT is in longitude 730 west through longitude 730 east (15 in width). Every 15 of longitude in width to the east and west of GMT is a time zone. There are 14 time zones to the east and 12 time zones to the west of GMT. GMT+14:00 is also GMT-12:00. Each zone observes a clock time one hour earlier than the zone immediately to the east (30 or 15 minutes between some time zones). People in the eastmost of a time zone can see the sun rise within one hour earlier than those in the westmost.

Theoretically, time zones are the longitudinal divisions of Earth's surface. In practice, however, the clock time is also regulated by the administrative boundary and longitudinal boundary. Most countries keep the clock against the time zone and an integral number of hours different from the GMT. Some countries also use the local time of the capital or important cities as the standard time of the whole country. Thus, the standard time of these countries may not be an integral number of hours different from the GMT.

1.2.2 DST

DST is a legal time. Benjamin Franklin, an inventor and American public official, put it forward in 1784. Benjamin proposed that people set the clock ahead of the GMT daylight saving changes because the day breaks earlier and the night comes later in summer than in other seasons.

In most countries/areas observing DST, the DST is one hour (not always) later than the standard time. For example, 10:00 in the morning becomes 11:00 DST.

DST is to make full use of daylight resources and save the resources and expense in fuel and power. About 70 countries/areas, including the Europe and North America, introduce DST. 1.3 Working Principle

Figure 1-1 Time synchronization among NTP Server, BAM and device

The configuration of time zone and DST is to change the local time. The NTP Server synchronizes the time to the GMT and does not contain any information about time zone and DST, so the configuration of time zone and DST has no influence on the NTP Server. The NTP Server can correct the GMT time on the BAM, but not the time zone and DST settings. The BAM controls its time zone and DST settings by itself.

When you change the time zone on the BAM, the local time of the system where the BAM is installed changes accordingly. For example, when GMT is 00:00:00, the local time of the BAM is at 07:00:00 (GMT+07:00), you can use the SET TZ command to change the time zone to GMT+08:00. The local time of the BAM is changed to 08:00:00. The BAM notifies the device of the new local time and time zone immediately.

When it is time to adjust the clock for daylight saving changes (DST start/end time), the time on the BAM is different from that synchronized by the NTP Server. The operation on the BAM is different:

If a valid NTP Server is configured on the BAM and the NTP Server and BAM are connected well, the BAM originates time synchronization to the NTP Server and adjusts the local time based on the DST settings.

If no valid NTP Server is configured on the BAM or all NTP Servers are disconnected, the BAM does not originate time synchronization to the NTP Server. It adjusts the local time on the BAM based on the DST settings automatically.

When the local time is changed, the BAM synchronizes the time, time zone and DST to the device and notifies the DST settings to all service processes. When the time is adjusted for daylight saving changes, the BAM sends the corresponding event alarm, Enter daylight saving time or Leave daylight saving time (see Table 1-1).

Table 1-1 DST alarms

Alarm IDAlarm typeAlarm nameReason

836Event alarm Enter daylight saving timeSystem entering daylight saving time, that cause system time changed.

837Event alarm Leave daylight saving timeSystem leaving daylight saving time, that cause system time changed.

In the DST system, the time in the output of an MML command is suffixed with DST.

Example:

2006-03-21 15:25:58 DST1.4 Benefits

1.4.1 Benefits to CarriersIn countries/areas using the DST system, the operator can change the system time of the MSOFTX3000 so that all services operate following the DST system. 1.4.2 Benefits to Mobile SubscribersThe operator provides services observing the local time, so the subscribers can enjoy services easily. 1.5 Availability1.5.1 Applicability

The feature is applicable to all UMTS and GSM networks.

1.5.2 Requirement for SoftwareNo special requirements for software and no other restriction from the License. 1.5.3 Requirement for HardwareNo special requirements for hardware. 1.6 Service Flow N/A1.7 Data Configuration1.7.1 Data Configuration on the MSOFTX3000Preparation

The time zone and DST settings on the MSOFTX3000 are independent from that in the Windows 2000 operating system. To enable the time zone and DST feature on the MSOFTX3000, you must disable the DST adjustment on the Windows 2000 where you install the BAM. Otherwise, the time zone and DST feature may not work on the MSOFTX3000 and the time on the BAM may be inconsistent with that on the device.

1. In Windows 2000, double-click the time icon on the taskbar.

Figure 1-2 Time icon

2. Click Time Zone. Deselect Automatically adjust clock for daylight saving changes, select the correct time zone from the drop-down list menu, and then click Apply and OK. Figure 1-3 Automatically adjust clock for daylight saving changes

Procedure

Table 1-2 Procedure

StepOperation

1Use the LST TZ command to check the time zone and daylight saving time configured on the BAM.

2Use the SET TZ command to set the time zone and daylight saving time on the BAM.

1.7.2 Sample Configuration

Scenario The BAM is at GMT-06:00 and the country introduces the DST system. At 00:00:00 on the last Sunday of March, people set the clock one hour ahead to start the life in the DST system. At 00:00:00 on the last Sunday of October, people set the clock one hour behind to start the life in standard time system. Scripts1. Use the SET TZ command to set the time zone and daylight saving time: SET TZ: ZONET=GMT-0600, DST=YES, SM=WEEK, SMONTH=MAR, SWSEQ=LAST, SWEEK=SUN, ST=00&00&00, EM=WEEK, EMONTH=OCT, EWSEQ=LAST, EWEEK=SUN, ET=00&00&00, TO=60;2. Use the LST TZ command to check the time zone and daylight saving time:

LST TZ:;

1.8 Operations1.8.1 Operations by Carriers

N/A1.8.2 Operations by SubscribersN/A

1.9 Service Interaction

1.9.1 Influence on NMS

When the DST system starts or the time zone changes, the system time on the BAM is offset from the standard time. Only the local time, not the GMT is changed, that is, the timer on the NMS keeps unchanged. The NMS can send a command to query the time zone and DST settings on an NE, calculate the local time where the NE is based on the query result, and deliver tasks based on the local time of the NE. The NMS can also convert the time zone and DST in the message reported from an NE to the local time or GMT of the NMS.

1.9.2 Influence on CDR, Statistics and Charging System

The operator can use an MML command on the MSOFTX3000 to configure the time zone and DST. The time zone and DST have different influence on CDRs, alarms and logs.

After the operator configures the time zone on the BAM, the device records the time zone information of each Media Gateway (MGW) or trunk group in the MGW database and trunk database. The time zone information influences the callee answering time, callee release time, MO call setup time, user radio channel assignment complete time and call alert time in the CDR.

For an ordinary call, the system adjusts the time in the CDR according to the time zone where the caller is. For a collect call, the system adjusts the time in the CDR according to the time zone where the callee is. The time change on the BAM and device due to the change of time zone does not change the call duration and tariff rate. If the time zone is changed during a call, the callee answering time, callee release time, MO call setup time, user radio channel assignment complete time and call alert time in the CDR are changed.

When it is time to adjust the clock for daylight saving changes after the operator configures the DST on the BAM, the BAM adjusts the system time immediately and sends the new time and DST offset to the device to update the time on the device. DST settings can change the absolute time of CDRs, alarms and logs.

When the DST system starts, the NE has a gap between the local time and GMT. When the DST system ends, the NE has an overlap between the local time and GMT. Therefore, the time is changed in the processing involving the local time of the NE in statistics, CDR and charging system. For example, the traffic measurements in the overlapped period are accumulated and not skipped in statistics.

For traffic measurements and charging in different time zones to be processed based on the local time, the time is converted to the local time zone and DST. _1210776569.vsd

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