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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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EPS Network Identifier in LTE

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Mobile country code (MCC) is a 3 digit code, assigned by international telecom union to identify a country in a mobile communication. Mobile network code (MNC) is a 2 to 3 digit code, assigned by national authority. Public land mobile network identity (PLMN Id) consists of MCC and MNC. It is used for unique identification of a PLMN. Tracking area identity (TAI) is globally unique and consists of PLMN id and tracking area code (TAC) where TAC is of 16 bits and it is used to indicate eNB to which Tracking Area the eNB belongs  and it is unique within a PLMN. It is similar to location area identity (LAI) in GSM. International Mobile Subscriber Identity (IMSI) consists of PLMN id and Mobile subscriber identification number (MSIN). It is unique identification of mobile (LTE) subscriber and not more than 15 digits. MME temporary Mobile Subscriber Identity (M-TMSI) is unique within MME and assigned by the operator. It is of 32 bits. SAE Temporary Mobile Subscriber I...
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