India one step closer to pan-India 4G adoption

Reuter reports that Indian Government has taken a decision this Monday to allow all the wireless broadband airwave holders to support voice over 4G by paying a one time fee of $306 million. This will remove the last regulatory hurdle to deploy LTE as the technology for both data and voice. Three large players, Reliance, Vodaphone and Airtel are expected to go full-steam in this year with LTE. For voice however, technology is still in the catch-up mode. Ideally, with LTE, the bearer protocol for the voice was expected to be voice over LTE. But voice over LTE still has some distance to cross before the technology can mature to substitute existing circuit-switched voice service provided by GSM. This is a case where market is moving faster than the technology.  For countries like India, who do not have large technology R&D investment in LTE or 3G wireless, market driving technology is in fact a boon. India does not need to follow a particular country (e.g. USA) or a technology, it has the freedom and latitude to follow the best of the breed. Fact is although GSMA adopted voice over LTE as the bearer protocol service for LTE technology in 2010, world's first ever commercial deployment of voice over LTE happened only in last quarter of 2012 when SK Telecom of South Korea launched the service with Ericsson and LG as the technology partner in September, 2012 [news announcement].
Operators in US and Europe have been trying with alternatives to voice over LTE as an interim solution but none of them match the spectral efficiency that VoLTE can provide. Heavyreading article provides a good summary on the alternatives that operators are trying for providing voice service over LTE. I have pasted their summary table here for those who are hard-pressed for time.
 As one can imagine, lack of clear choice impacts not only the network readiness but the handsets too. Huawei spokesperson stated last year that the aim is to bring voLTE enabled handset by 2013. Operators definitely want a single IP-based voice delivery solution, for LTE, which can simultaneously deliver voice, video and data so that it becomes credible deterrent against existing VoIP service like Skype. So there is no doubt that all the handset manufacturers would focus their resources to bring out fully voLTE capable handsets but challenge of interworking with multiple evolving technologies can be a serious hurdle. The hurdle can be somewhat reduced if the handset manufacturers work together. For a service to function smoothly, handsets from different manufacturers must agree on a single common procedure for voice call transfer, or voice/video call switch or roaming service. Some of them are part of the standard, but many are design artefacts which handset manufacturers must settle between themselves. For the first generation voLTE smartphones [from LG or ZTE] call switch quality appear to be satisfatory but power consumption appear to be on higher side [source]. Fallout of all these is, we may have to wait till the end of 2013, to see fully functional voLTE handsets from leading handset manufacturers like Samsung, Nokia or Sony-Ericsson. Indian operators have another hurdle. Indian operators have adopted LTE-TDD, as opposed to LTE-FDD that European operators adopted, following China and other Asian countries [check my previous posts]. This may mean that Indian operators may have to depend on Huawei or ZTE to bring the first set of handsets for Indian LTE voice/video consumers.Incidentally Airtel last year launched LTE multimode based Huawei smartphone, in India, that actually use 3G CS fallback alternative for voice calls [first alternative in the table]. In other words they do not support VoLTE yet.
So what does all these mean to you? If you are a technology enthusiast looking forward to buy a 4G smartphone, it means that you perhaps would like to wait till the end of the year when voLTE enabled handsets will be launched. Otherwise you are quite likely to replace your handset with another 4G handset in 2014.