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LTE Radio Access, Rel. FDDLTE 15A, Operating Documentation, Issue 02 Flexi Multiradio BTS LTE Alarms and Faults
1. Introduction 1.1 Overview of BTS alarms and faults This document describes the handling of base station (BTS) alarms and faults. The base station software uses these alarms and faults as a basis for internal diagnosis and fault reporting through the OMS to the Operations Support System (OSS) and the BTS Site Manager. 1.2 Handling of BTS alarms and faults Base station alarm handling is based on unit or module state information. It prevents the sending of unnecessary alarms by checking and updating unit states. Fault messages come either from hardware devices or software components. The faults are system or hardware specific. The Fault Diagnosis System creates upper network alarms, which are based on an analysis of the faults, and sends them to the BTS Site Manager. In addition NetAct is used for handling the BTS alarms. The BTS is able to maintain alarm handling after it has been commissioned and is in a configured state. During the start-up, the BTS waits for the real-time clock from the Network Time Protocol (NTP) server, and the fault diagnosis starts after the time has been set or a time-out has been detected. If the BTS is unable to set the time using the NTP server, the default time (1.1.2004) will be used. BTS transmission alarms The base station transmission alarms (7665) are reported towards OMS or NetAct. The transmission equipment uses the base station interface. Therefore, retrieval of the alarm information is mapped either in the OMS or in the NetAct to distinguish between the alarms by using the fault ID. Instructions for solving problems When starting to solve a problem, first refer to the instructions given in the individual alarm descriptions. Verify the configuration of a BTS by checking the commissioning, cabling and correct installation of the modules at the BTS. Make sure the environment does not cause the fault. If an active alarm is a 'Start' alarm, a unit block/unblock (if supported by the unit) or a site reset is required to cancel it. If the site reset or unit block/unblock does not help, replace the faulty unit or module. See the fields 'Fault source' and 'Instructions' in the corresponding alarm description. Blocking and unblocking The 'Cancel' alarms are always sent to hosts (LTE BTS Site Manager). When the unit or cell is in a blocked state, the 'Start' alarms are only sent to LTE BTS Site Manager. When a unit or cell is unblocked, all the active alarms related to the unblocked unit, module, or cell are automatically sent to the hosts.
2. How to read this excel report The excel report provides a full information on faults and alarms. It shows the full set of fault and alarm attributes including the change information. The excel report consists of two main sections: - Alarm List - Fault List The alarms and faults are listed by numbers in an ascending order. 2.1 Alarm List This section shows the full alarm information including the following items: - alarm number - alarm name - meaning of the alarm - instructions - list of related faults - clearing information - change information 2.2 Fault List This section shows the full alarm information including the following items: - fault ID - fault name - meaning of the fault - instructions - list of related alarms - change information 2.3 Field descriptions Field descriptions are provided in the second row of Alarm List and Fault List sections. Use fold (-) and unfold (+) buttons on the left panel to respectively hide and show the field descriptions. 2.4 Change information Change information is a part of Alarm List and Fault List sections and is available in the following ways:
1. Definition on whether the fault/alarm is new, removed. That definition is provided in the following columns: - Changes between issues ... which shows the changes since the previous issue of the document. - Changes between releases ... which shows the changes since the latest issue of the document in the previous product release. If the cell is empty, the alarm/fault is not changed, nor new, nor removed. Note that removed alarms/faults are listed in the very bottom and they are marked with red font. Filters are enabled for convenient browsing of the change categories. 2. Detailed change information showing the current and previous values of parameter attributes. That information is provided in the following columns: - in issue ... which shows the value in the previous issue of the document. - in release ... which shows value in the latest issue of the document in the previous product release. The columns are grouped into attribute-specific sections for structured and convenient view. Use unfold (+) and fold (-) buttons in the top bar to browse the attribute-specific change details. Use unfold all (2) and fold all (1) buttons on the left hand side of the top bar to respectively show and hide the change details for the whole report. Note that for all faults/alarms except new and removed ones, the field values for previous issue and previous release are always provided to show a total history information. Additionally, the changed attributes of faults/alarms are highlighted with grey color. Highlights are enabled to specify whether there is a change between issues or releases.
