【資料名稱】：Handling Common Problem Situations in BSC.pdf

【資料作者】：無

【資料日期】：無

【資料語言】：英文

【資料格式】：PDF

【資料目錄和簡介】：

Table of Contents
This document has 91 pages.
Summary of changes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1 Overview of common problem situations in BSC. . . . . . . . . . . . . . . . . . . 8
2 Problems with radio network configuration and recovery . . . . . . . . . . . 11
2.1 Modifying radio network configuration fails because of lack of resources .
11
2.2 Outputting or modifying radio network configuration fails without obvious
reason . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.3 Radio network object is not found in BSDATA. . . . . . . . . . . . . . . . . . . . 13
2.4 BCF configuration with EDGE and non-EDGE TRXs in the same BTS fails
14
2.5 TRX LAPD links remain in the UA-AD RN RECOV state without an active
alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3 Problems with circuit-switched calls. . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.1 Inter-system handover BSC-RNC-BSC fails . . . . . . . . . . . . . . . . . . . . . 17
3.2 Activating AMR HR (HR3) with parameter HR_FEATURE_IN_BSC fails .
17
3.3 Cell Broadcast Centre does not work . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.4 Circuit-switched call fails with alarm 1582 CONNECTION OR RELEASE
ERROR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.5 BSC-BSC interface configuration to only one BCSU unit causes problems
during BCSU switchover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.6 Alarm 7737 INCONSISTENT DATA IN RADIO RESOURCE MANAGEMENT
STATE FILES is raised. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.7 Alarm 7741 MEAN HOLDING TIME ABOVE DEFINED THRESHOLD is
raised . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.8 Alarm 2725 ADJACENT CELL IDENTIFIER CONFIGURATION ERROR is
raised . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
3.9 SIGTRAN A interface is down (UA-INS) . . . . . . . . . . . . . . . . . . . . . . . . 22
4 Problems with packet-switched calls . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.1 Problems with TBF establishment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.1.1 TBF establishment fails due to lack of Abis channel resources. . . . . . . 25
4.2 Problems with GPRS/EDGE cell changes. . . . . . . . . . . . . . . . . . . . . . . 26
4.2.1 High NCCR failure rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
4.3 Problems with transmission in the Abis interface. . . . . . . . . . . . . . . . . . 27
4.3.1 Continuous resynchronisation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.3.2 Unsuccessful initial synchronisation or resynchronisation. . . . . . . . . . . 28
4.3.3 No PCU synchronisation frames received from the BTS. . . . . . . . . . . . 30
4.3.4 BPN jump in synchronisation time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
4.3.5 TBFs do not have enough EDAP resources . . . . . . . . . . . . . . . . . . . . . 32
4.3.6 EDAP configuration fails . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.4 Problems with transmission in the Gb interface. . . . . . . . . . . . . . . . . . . 35
4.4.1 Inconsistent BVCI states between the BSC, the PCU and the SGSN. . 35
4.4.2 BSSGP protocol error raised with cause code 0x20 or 0x21. . . . . . . . . 36
4.4.3 BVCI operational state remains UNBLOCKED . . . . . . . . . . . . . . . . . . . 36