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ERROR DETECTION AND RECOVERY TRIGGERED BY CALL DURATION

IP.com Disclosure Number: IPCOM000008801D
Original Publication Date: 1998-Sep-01
Included in the Prior Art Database: 2002-Jul-15
Document File: 2 page(s) / 102K

Publishing Venue

Motorola

Related People

Charles Sloan: AUTHOR [+2]

Abstract

There are numerous factors which can con- tribute to poor quality in a telephone interconnect call. Although fault management processes and tasks attempt to prevent the initiation of these calls, it is virtually impossible to eliminate their occur- rence completely due to the dynamic nature of the system's resources and configuration. A system which experiences high amounts of calls that are short in duration may exhibit problems that could not be detected by conventional fault management methods. A short duration call is a possible indica- tion that the integrity of the audio path is compro- mised leading the user to terminate the call prema- turely. Since it is not possible for a single network element to detect and diagnose all components pert- nent to audio quality (terrestrial circuits) RF circuits, voice processing resources, etc.), it is likely that faulty resources will be assigned multiple times before a problem is discovered.

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MOTOROLA Technical Developments

ERROR DETECTION AND RECOVERY TRIGGERED BY CALL DURATION

by Charles Sloan and Andrew Chu

ABSTRACT

  There are numerous factors which can con- tribute to poor quality in a telephone interconnect call. Although fault management processes and tasks attempt to prevent the initiation of these calls, it is virtually impossible to eliminate their occur- rence completely due to the dynamic nature of the system's resources and configuration. A system which experiences high amounts of calls that are short in duration may exhibit problems that could not be detected by conventional fault management methods. A short duration call is a possible indica- tion that the integrity of the audio path is compro- mised leading the user to terminate the call prema- turely. Since it is not possible for a single network element to detect and diagnose all components pert- nent to audio quality (terrestrial circuits) RF circuits, voice processing resources, etc.), it is likely that faulty resources will be assigned multiple times before a problem is discovered.

continue to be assigned to faulty resources is that certain faults are out of control and are not local to a single network element. For instance, there are thou- sands of configuration parameters that need to be entered correctly across adjacent elements (e.g. BTS and BSC, BSC and MSC, MSC and PSTN) for audio to travel properly. A mismatch in configura- tion between two elements is likely to allow calls to proceed across an audio path that is faulty.

  A technique would limit these types of audio problems is the use of diagnostics which are based on the duration of a call (see Figure 1). The network element must monitor the duration of each call and track the resources (circuits, voice processors, inter- nal resources, etc.) assigned in that call. If the call duration falls below a specified threshold, T,,, (it is recommended that this be configurable), a counter is incremented for each resource involved. The counter is returned to zero each time a resource is used...