SCEF in IoT

SCEF in NB-IoT  – S6t-S6a-S6b For NonIP data delivery in IoT or Internet of Things, there is a SCEF network node. SCEF full form is the Service Capability Exposure Function. IoT is the network of connected devices over the Internet.  SCEF exposes API to the IoT device to access.  Accessing a device may be getting …

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slg and slh interface

SLG Interface and SLh Interface – Diameter Protocol- LTE Both are 3GPP interfaces in the LTE network. SLG interface is between GMLC and MME, and the SLh interface is between HSS and GMLC for providing location-based services in LTE(4G). Similar to other LTE interfaces, the Diameter protocol provides transport for SLG and SLh interface messages. …

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tcp keep alive

What is TCP Keepalive Before going into details of TCP keep alive.  We will have an overview of what is keepalive in general? Connection-oriented network protocols use keepalive technique, to check the health of a connection. Keepalive requires a periodic check over a connection when there is no data in either direction for a long …

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gmlc and smlc

What is GMLC and SMLC in telecom Gateway Mobile Location Center(GMLC) and Serving Mobile Location Center(SMLC) are two GSM nodes for location-based services (LBS).  LBS opens new revenue streams for mobile operators and service providers. Basic GSM network for voice and data can deliver, location information, but that lacks accuracy. Accuracy means, the network operator …

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tcp sequence number

What is the TCP sequence number?  Before starting anything about the TCP sequence numbering mechanism, we must understand the two main functionalities of TCP protocol.  TCP is an example of a transport layer protocol as per the OSI model. TCP provides reliable and sequenced delivery of messages in each direction.  Reliable means no packet loss and sequence …

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auc in gsm

AUC in GSM, 2G, 3G and LTE authentication Each mobile device has a sim card in telecom, which authenticates from a mobile operator of sim provider, before any voice, SMS or data services. Why we need Auc in GSM, as the network is owned by mobile operators, so all communication must be safe? We need …

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