CSFB (CS Fallback) in Mobile Networks
CSFB refers to "Circuit-Switched Fallback". It is a mechanism used in case the 4G network is still not ready for handling voice calls of 4G connected users.
It allows the users to seamlessly transition from the 4G packet-switched network, to the 3G/2G circuit-switched network, in order to initiate or receive a voice call.
CSFB is a crucial feature in 4G networks, as it allows mobile devices to maintain access to voice and other legacy services when the 4G network is not suitable for those services.
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VoLTE (Voice over LTE) Introduction
While the UE attached to LTE network, the UE can initiate, or receive a voice or a video call. The UE achieves this, by connecting to an external network, which is the 'IMS' network. We can call this, Voice over LTE (VoLTE). This is exactly like when you would like to create a call, while…
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What is an ‘EPS Bearer’ in LTE ?
During 'LTE attach' procedure, the network establishes this EPS Bearer between the UE and the PGW. The PGW assigns an IP address for this Bearer. The UE uses this IP address, in order to communicate with the PDN. In addition, the PGW assigns a QoS for this Bearer, which guarantees the QoS for the data…
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QoS ‘Quality of Service’ in GPRS
QoS refers to 'Quality of Service'. After 'PDP context activation' procedure completes, a 'PDP context' shall exist on the MS, the SGSN, and the GGSN. In addition, the GGSN assigns a QoS for this 'PDP context'. This QoS describes the priority that the nodes shall give to traffic belonging to this 'PDP context'. The subscription…
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