# MSC - Service

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Descriptions

The MSC measurement gives overall call statistics reports from MSC on traffic service, traffic based on trunk and trunk group, Erlang, and BHCA.

The granularity period, which is the time between the successive gatherings of measurement data, is 15 minutes. That means the statistics reports on the EMS GUI will be updated in every 15 minutes. There are up to 30 days' statistics reports can be checked via the EMS, and the searching interval is on a daily basis. Each statistics on a daily basis can be specified by 24 hours which lie between 00:00 and 24:00.

All statistics reports generated by EMS have the same layout, including cross tabulation and charts of stacked line or column:

•Cross tabulation:

The vertical section classifies the measure objects or time intervals.

The horizontal section defines the results or time intervals.

•Stacked Line:

Displays the trend of the percentage each value contributes over time and categories.

•Stacked Column:

Compares the percentage each value contributes to a total across categories.

The MSC service gives an overall call statistics report from MSC on the 12 types of call described below.

Call Type | Descriptions
Subs to Subs | Mobile originating traffics to mobile.
Subs to Trunk | Mobile originating traffics to PSTN.
Trunk to Subs | PSTN originating traffics to mobile.
Trunk to Trunk | Transit and intra-connected traffics.
Intra Connection | Traffics on the intra-connected trunks.
Subs to IP | Mobile originating traffics to Intelligent Peripheral.
Trunk to IP | PSTN originating traffics to Intelligent Peripheral.
Mobile Originated | Mobile originating traffics to mobile, PSTN, Intelligent Peripheral, or intra-connected trunks.
Mobile Terminated | Mobile terminating traffics from mobile or PSTN.
In Trunk | Incoming PSTN traffics.
Out Trunk | Outgoing PSTN traffics.
IP Terminated | Intelligent Peripheral terminating traffics from mobile or PSTN.

Call Failure | Descriptions

Call Deny

This cause indicates that the MS has tried to access a service that the MS's network operator or service provider is not prepared to allow. It may be caused by the following reasons:

•Unassigned (unallocated) number

•No route to destination

•Channel unacceptable

•Operator determined barring

•Number changed

•Non-selected user clearing

•Invalid number format (incomplete number)

•Facility rejected

•Response to STATUS ENQUIRY

•Normal, unspecified

•Quality of service unavailable

•Requested facility not subscribed

•Incoming calls barred within the CUG

•Bearer capability not authorized

•Bearer capability not presently available

•Service or option not available, unspecified

•ACM equal to or greater than ACMmax

•Bearer service not implemented

•Requested facility not implemented

•Only restricted digital information bearer capability is available

•Service or option not implemented, unspecified

Net Busy | Network Busy indicates that there is no appropriate circuit/channel presently available to handle the call. It may be caused by the following reasons: •Destination out of order •No circuit/channel available •Network out of order •Temporary failure •Switching equipment congestion •Access information discarded •Requested circuit/channel not available •Resource unavailable, unspecified
Caller Clear | This cause indicates that the call is being cleared because the calling subscriber involved in the call has requested that the call be cleared.
Sub Busy | Subscriber Busy is counted when the called subscriber has indicated the inability to accept another call. It may be caused by the following reasons: •User busy •Call rejected •Pre-emption
No Answer | This cause is counted when a subscriber has provided an alerting indication but has not provided a connect indication within a prescribed period of time. It may be caused by the following reasons: •No user responding •User alerting, no answer

Signal Error

This cause is counted by the following reasons:

•Invalid transaction identifier value

•User not member of CUG

•Incompatible destination

•Invalid transit network selection

•Semantically incorrect message

•Invalid mandatory information

•Message type non-existent or not implemented

•message type not compatible with protocol state

•Information element non-existent or not implemented

•Conditional IE error

•Message not compatible with protocol state

•Recovery on timer expiry

•Protocol error, unspecified

•Interworking, unspecified

There are ten statistics items for each type of call: call attempt, call answer, six categories of call failure, total and average call duration. The statistics is collected on both quantity and percentage basis, and concluded by the following formula:

•Total Call = Sum of Call Attempt

•Attempt = Success + Call Deny + Net Busy + Caller Clear + Sub Busy + No Answer + Signal Error

•Average Call Duration = Total Call Duration / Success

Two statistics histograms about call attempt and call answer / failure are provided on this page.

The Date navigator is used to select up to the last 30 days' statistics for browsing and printing. The Print logo is for printing out this statistics page.

Functionalities

•MSC overall call statistics for different type of calls

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