r LTE. VoLTE codecs digitize voice and put it into packets to be transmitted along with data and video. When LTE was first available, voice was carried separately on spectrum used for older protocols. The 3GPP developed VoLTE as a standard way to transmit VoIP. The VoLTE protocol is tightly specified SO that roaming and interoperability with earlier-generation networks are possible. VoLTE is designed to interoperate with Internet Protocol Multimedia Subsystems (IMS). IMS enables applications for voice, video, and online www.TechnicalPDF.com games to be stored, billed for, and accessed on a common IP platform. See below for IMS. Advantages of VoLTE include: Higher-voice quality equal to that of calls made from landline phones High-quality video calls Efficient use of the same spectrum for voice, data, and video A standard way of handling voice Faster call connection times Support for E-911 calls Spectrum previously set aside for voice can be re-used for other services Simultaneous Voice and Data The VoLTE protocol specifies that the same device can be used for voice and Internet access simultaneously. Prior to the advent of VoLTE, when a user received a voice call, her data connection was dropped. With VoLTE, someone using her device to browse the Internet, can answer a phone call without dropping her data connection. This is also true when a subscriber is on his phone and he looks up the weather forecast or checks his phone's calendar without dropping his voice call. Using High-Definition Voice to Improve Quality Voice quality on LTE has dramatically improved from that of previous mobile generations. This is due to improved codecs that compress and decompress analog voice for transmission on digital data networks. The VoLTE standard specifies improved noise cancellation. Noise cancellation distinguishes between voice and background noise and removes the noise SO that voice is clearer. Matching codecs are required in the handset and in the network. High definition voice supports higher and lower frequencies than p