VoLTE Single Radio Voice Call Continuity (SRVCC)

What is Single Radio Voice Call Continuity (SRVCC)?


SRVCC is an LTE functionality that allows a VoIP/IMS call in the LTE packet domain to be moved to a legacy voice domain (GSM/UMTS or CDMA 1x).

Consider a case where a new LTE network operator wants to move voice services to VoIP over IMS in conjunction with the deployment of an LTE access network. In the absence of other options, this operator would need to provide ubiquitous LTE coverage on day 1 to have a competitive VoIP service. However SRVCC enabled LTE may not require complete LTE coverage. 

Learn more LTE Training 

 

Evolution from GSM to LTE-Advanced and Voice over LTE (VoLTE)

From GSM to Voice over LTE (VoLTE)

Voice-over-LTE is a big deal for mobile operators worldwide today moving subscribers from their traditional 2G networks to their new 4G networks. Operators want to to get off of GSM and CDMA and on to LTE to increase their capacity tenfold or more for their networks.

Voice and messaging services for Long-Term Evolution (LTE) is happening.  Using IP Multimedia Subsystem (IMS) developed by 3GPP, end-to-end voice and SMS messaging along with Roaming and Interconnection is a reality now.

VoLTE is built upon underlying 3GPP principles including LTE and IMS. VoLTE has similar characteristics like Vonage. It is more than just Voice over IP (VoIP). The IP networks are mostly managed with MPLS or other layer 2/3 techniques.

Rather than connecting an legacy circuit switched call, VoLTE calls are transmitted over LTE EPC and IMS networks using SIP as the signaling protocol.

VoLTE can use "HD Voice" or Rich Communication Services (RCS) will merge picture and video messaging.

RCS (Rich Communication Services) will deliver high quality voice and SMS by providing them with instant messaging or chat, live video and file sharing across any mobile device, on any network.  

LTE, EPC & Converged Mobile Backhaul

The Magic of Converged Mobile Backhaul for LTE

 

 
Service providers are revamping their Backhaul strategies with the deployment of  LTE and LTE-Advanced, and with an eye on the real cost of capacity provided by Packet Microwave as one of the most cost-effective and rapid rollout solution to LTE backhaul.

Packet Microwave is the Next Generation microwave radios supporting ‘All-IP"architecture suitable for LTE and LTE-Advanced supporting:

• Native IP transport with built-in Layer 2 Ethernet switching
• Intelligent use of spectrum using Adaptive Coding and/or Modulation, combined with co-channel operation
• Legacy TDM traffic supported natively (hybrid) and/or using emulation technologies such as Pseudowire (PWE)
• Packet synchronization support (e.g., IEEE 1588v2, Synchronous Ethernet)
• Advanced OAM (Operations, Administration, and Management) to ITU-T Y.1731,IEEE 802.1ag and IEEE 802.1ah

Example of Available Channel Size(applied to LTE)

• 10 MHz
• 20 MHz 
• 100 MHZ

Modulation Format

• QPSK
• 16QAM
• 64QAM
•  256QAM

Example of Receiver Sensitivity

•     -62 dBm (256 QAM maximum speed);
•     -88 dBm (QPSK minimum speed)

Features

•     ATPC (Automatic Transmit Power Control)
•     Modulation Shifting
•     Forward Error Correction

Mcirowave Backhaul for LTE

Wireless Backhaul for LTE and LTE-Advanced

LTE mobile network operators can  chose between microwave and fiber solutions. The benefits of microwave backhaul is more scalability and less costly. Microwave is reliable and it is a viable  backhaul solution.  LTE backhaul capacity needs are being easily addressed by packet microwave today with speed up to 1 Gbit/s.

 Microwave backhaul is not as susceptible to construction accidents.  Millimeter technology allows for high-density deployments, facilitating co-location and facility sharing. For example, 80 GHz systems can achieve multi-gigabit speeds at 5-6 mile ranges with high service availability.
  

 Why Microwave Backhaul for LTE:

• Lower transport costs and no monthly fees 
• Faster deployment time  
• Higher density deployments 
• High reliability 

 

LTE traffic will be dominated by data, and multimedia  applications ranging from non-real time services such as email , web browsing, peer-to-peer, video, location based services, maps,  and file sharing to real-time and delay sensitive services such as video and voice. LTE-ready microwave backhaul systems must deliver high capacity and low latency over an IP network with important features such as:

•  QoS aware Adaptive Coding and Modulation supporting QPSK, 16QAM, 64QAM and 256QAM
• Statistical Multiplexing
  Ethernet rings using IP/MPLS, PBT or Carrier Ethernet
• Carrier Grade Ethernet switch as part of the Radio link up to 99.999% availability