This month it is LTE and Voice!! In the previous blog we have seen the problems/developments in voice over LTE. Lets dig deeper into the basics!!
What exactly is Voice over LTE.
As previously said, LTE is an all IP network and voice call in GSM, UMTS and CDMA2000 are circuit switched. Currently all the calls go on 2G/3G systems.
There are several proposed approaches. The chart below shows these.
There are four approaches. Lets discuss them one by one.
1. Circuit Switched Fall Back (CSBF): This is the simplest option. In this case LTE is data only network and whenever there is a voice call to be received/initiated , it will fall back to circuit switched domain(2G/3G).
2. Simultaneous voice LTE (SV-LTE) : This is a handset based solution. The device works simultaneously in the Circuit switched and LTE(packet switched)
modes providing voice services and data services respectively. Can you think of the battery life of such a device??
3. Voice over LTE via GAN (VoLGA) : This concept came up to unable LTE users to receive voice/SMS as they transition between LTE/GSM/UMTS. This was an interim solution.
4. One Voice/Voice Over LTE (VoLTE) : This approach eliminates the dependency on the circuit switched networks. This will facilitate LTE networks to be stand alone networks. It is based on IP Multimedia Subsystem (IMS).
The key technical requirements for VoLTE :
1. IP Multimedia System (IMS)
2. SMS over IP
3. Multimedia telephony.
4. Single Radio Voice call continuity
What exactly is Voice over LTE.
As previously said, LTE is an all IP network and voice call in GSM, UMTS and CDMA2000 are circuit switched. Currently all the calls go on 2G/3G systems.
There are several proposed approaches. The chart below shows these.
There are four approaches. Lets discuss them one by one.
1. Circuit Switched Fall Back (CSBF): This is the simplest option. In this case LTE is data only network and whenever there is a voice call to be received/initiated , it will fall back to circuit switched domain(2G/3G).
2. Simultaneous voice LTE (SV-LTE) : This is a handset based solution. The device works simultaneously in the Circuit switched and LTE(packet switched)
modes providing voice services and data services respectively. Can you think of the battery life of such a device??
3. Voice over LTE via GAN (VoLGA) : This concept came up to unable LTE users to receive voice/SMS as they transition between LTE/GSM/UMTS. This was an interim solution.
4. One Voice/Voice Over LTE (VoLTE) : This approach eliminates the dependency on the circuit switched networks. This will facilitate LTE networks to be stand alone networks. It is based on IP Multimedia Subsystem (IMS).
The key technical requirements for VoLTE :
1. IP Multimedia System (IMS)
2. SMS over IP
3. Multimedia telephony.
4. Single Radio Voice call continuity
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