VoLTE

This item "VoLTE" was translated halfway. (the original: English version "VoLTE") I demand a person cooperating with translation work. Please refer to a notebook page and a history, the guidelines on translation. Do not forget entry of the translation information to an abstract column. (November, 2014)

VoLTE (English: Voice over LTE, Voice over Long Term Evolution, voice over long shot term evolution, ボルテ) is the name of data communication technology used by a cell-phone and the communication technology standard.

The LTE network is available for high-speed packet switching, but does not assume the circuit switching for voice calls. Therefore it deals with a sound and video communication as data (packet), and it is VoLTE one [¹] that standardization is pushed forward as a technique to realize a voice call and video communication in an LTE network in GSMA. The delay that a QoS guarantee grieves at is easy to occur by the VoIP to go by way of the Internet, but controls a delay by the control given priority by the QoS guarantee in VoLTE. In addition, the call quality more than the third generation conventional mobile communication system is got by adoption of the audio codec which is broadband [²].

Table of contents

Summary

VoLTE is the technique that GSMA defined in standard document PRD IR.92 because LTE can deal with a sound in IP multimedia subsystem [³].

The characteristics of VoLTE are as follows.

• I eat and can transfer sound service (control plane, media plane) to LTE D as data flow in ARA. It is not in this way necessary to depend on the conventional circuit switching network.
• More than 3 times of the 3G UMTS, I have data capacity more than 6 times of the 2G GSM. In addition, I can effectively utilize a bandwidth because the header of the VoLTE packet is smaller than a header of normal VoIP/LTE [⁴].
• Sound quality improves by adoption of the new codec (AMR-WB, EVS).
• Speaking high speed LTE data communication is possible.

The interconnection between companies is necessary for the call that stepped over the cell-phone company of high-quality sound, but, as of 2016, there is no company which realized this. In addition, I can enjoy a merit of partial (the speedup of incoming and outgoing calls or speaking LTE data communication) VoLTE except the sound quality when only one side of dispatch or the receipt performs VoLTE correspondence. In addition, I can expect the sound quality improvement of the amount when codec (EVRC-B, AMR-NB) on the cell-phone side becomes the bottleneck of the sound quality at PHS, then including the landline partner.

The connection agreement between cell-phone companies is necessary about the use of VoLTE during global roaming and is gradually pushed forward.

Service in Japan

In Japan, [⁷] starts VoLTE service each [⁶], SoftBank Mobile [⁵], association of KDDI, Okinawa Cellular Telephone (each au) NTT DOCOMO from December 19, the same year from December 12, the same year from June 24, 2014. All use "ボルテ" as a reading of VoLTE [⁸]; [⁹] [¹⁰].

docomo was equivalent only to AMR-WB as audio codec at first, but I provide VoLTE (HD+) in correspondence with EVS codec later and start it.

The au built a network for exclusive use of VoLTE taking advantage of this from a terminal and an SIM card to PLMN and greatly cut a rudder to the direction that broke off support of conventional CDMA2000, and did マイグレーション.

Even if it is dispatch from the LTE area at first in SoftBank, it was the specification that it is done a fallback about the emergency call dials such as the 110th reports by 3G, and is sent to [¹¹], but is improved so that it is sent as VoLTE by February 1, 2017 [¹²].

Footnote

1. ^ Voice and Video calls over LTE
2. ^ "There is a merit it what VoLTE beginning in docomo ASCII.jp; is (2/2)". ASCII.jp (May 16, 2014). December 26, 2014 reading.
3. ^ Nick Russell (March 3, 2013). "Official Document IR.92 - IMS Profile for Voice and SMS" (PDF). GSMA. September 14, 2014 reading.
4. ^ Elkin, Ed (April 10, 2014). "The Secret Value of VoLTE". TMCnet. http://blog.tmcnet.com/next-generation-communications/2014/04/the-secret-value-of-volte.html September 14, 2014 reading. 
5. ^ "an offer start of nation's first VoLTE." NTT DOCOMO (June 18, 2014). February 15, 2015 reading.
6. ^ "About an offer start of next-generation voice call service "au VoLTE"". KDDI (October 27, 2014). February 15, 2015 reading.
7. About the ^ "start of the voice call service" by "VoLTE." SoftBank Mobile (December 12, 2014). February 15, 2015 reading.
8. ^ "VoLTE/VoLTE (HD+) | Service, function | NTT DOCOMO". NTT DOCOMO. April 12, 2017 reading.
9. ^ "au VoLTE (ボルテ) | Service, function | au". KDDI. April 12, 2017 reading.
10. ^ " VoLTE (ボルテ) | Other network services | Communication, area | Mobile | SoftBank". SoftBank. April 12, 2017 reading.
11. ^ "VoLTE" "option offer condition book." SB partners (December 2, 2016). March 31, 2017 reading.
12. ^ "VoLTE" "option offer condition book." SoftBank (February 1, 2017). March 31, 2017 reading.

References

Allied item

• Long Term Evolution
• The third generation mobile communication system
• The third .9 generations mobile communication system
• VoIP
• HD Voice

Outside link

• "VoLTE" (IT glossary of terms e-Words)
• "KDDI President Tanaka interview: LTE all in VoLTE already "Ready" an employee 6,500 testing equipment, ditch board VoLTE test" (Engadget Japan version)
• "There is a merit it anything VoLTE beginning in docomo" (ASCII.jp)
• VoLTE (ボルテ) | Area | NTT DOCOMO
• au VoLTE (ボルテ) | au (KDDI)
• With VoLTE (ボルテ) | Network service of SoftBank | Communication, area | Mobile | SoftBank
• Enhanced Voice Services Codec for LTE - 3GPP

This item is an unfinished item in conjunction with a cell-phone, the PHS. I demand the cooperator who corrects it, and corrects this item. When a correction item is clear, please use {{Keitai-expand}}.

This item is an unfinished item in conjunction with the computers. I demand the cooperator who corrects it, and corrects this item (PJ: computer /P: computer).

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