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Troubleshooting for GSM KPIs (SD Block & SD Drop)

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KPIs to be monitored: ·             SD Blocking ·             SD Drop SDCCH Channel: ·    SDCCH channel is a dedicated channel which is using for LAC updation, Call Setup, SMS in Ideal mode. It works in UL & DL SD Blocking: ·    SD Blocking means that you are not getting SD resource for the call origination. When MS connects with Network then RACH and AGCH are provided. After AGCH, SDCCH is provided but if SDCCH is not provided at this time due to some problem or due to unavailable of SD by BSC. KPI Formula in Ericsson: ·             SDCCH CONGESTION = (CCONGS / CCALLS) * 100 ·             CCONGS - Congestion counter. ·  ...
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PS core network

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The PS core network consists of two parts, the traditional General Packet Radio Service (GPRS) core network and the new Evolved Packet System (EPS) core network. The PS core network connects mobile subscribers to Packet Data Networks (PDNs) such as the Internet, corporate networks or operator services networks.  a functional overview of the PS core network. Logical entities and interfaces are shown in black and form a 2G/3G network, while the blue boxes and lines in Figure  show the LTE/EPC related parts. The LTE/EPC network can be regarded as an extension and evolution of existing 2G/3G networks. From a node implementation perspective, there is no strict border between the two networks. The corresponding logical entities of GPRS and EPS networks can be deployed concurrently in Ericsson PS core nodes, such as the SGSN-MME and EPG; these are marked in red. In addition, Ericsson GPRS nodes can be upgraded with EPC functionality by software only. Network evolution i...
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Ericsson KPI Formula

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KPI Target FORMULAE - ERICSSON Random Access Success Rate % >=98 100 * CNROCNT / (CNROCNT + RAACCFA) SDCCH Blocking % <=0.5 100 * CCONGS / CCALLS SDCCH Drop % <=1.2 100 * (CNDROP - CNRELCONG) / CMESTAB TCH Blocking % <=1 100 * (CNRELCONG + TFNRELCONG + THNRELCONG) / TASSALL TCH Time Congestion/Cell <=50 sec Cells with Full Rate only: 100 * TFTCONGS / (PERLEN*60) Cells with Half Rate: 100 * THTCONGS / (PERLEN*60) TCH Assignment Success Rate % >=97 100 * TCASSALL / TASSALL TCH Drop % <=2 100 * TNDROP / TCASSALL Handover Success Rate % >=95 100 * HOVERSUC / HOVERCNT Avg SDCCH Congestion/cell <=50 sec 100 * CTCONGS / (PERLEN*60) Avg TCH Congesti...
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