Trai Issues Directions to Measure Quality of VoLTE Services

The Telecom Regulatory Authority of India (Trai) has now notified directions on quality of service (QoS) for Voice Calls for LTE users through Circuit Switched Fall Back (CSFB) option that is proposed to measure and report call set up delays. The regulations came after Trai had initiated public consultation on February 26 and an ‘Open House Discussion’ was held on April 23, said a Trai statement, adding these were to “measure call set up delay for mobile originating and terminating calls on sample basis in the networks where LTE has been launched, but Voice over LTE (VoLTE) is yet to be launched”.


Measurements are to be taken by the access providers in every quarter of the year and reported to Trai, it said, adding that measurements to be made in various locations of the identified cities or districts in the service area.

As per the statement, service providers are required to conduct such tests on at least 20 locations in each identified cities or districts. At least five cities or districts are to be identified for carrying out these tests, it added.

The regulator also released enhanced standards to gauge the quality of service of both wireline and mobile telephone services. This news was reported by IANS.

The regulator discussed the issue of silence or voice mute and requirement of a new quality of service parameters specific to voice services for LTE users. “From the discussions and deliberations on the issues related to VoLTE, muting of voice or silence during conversation seems to be a major concern,” the statement said.

Trai decided to introduce two new network parameters for quality of service regulations — “Down Link (DL) Packet Drop Rate or DL-PD” and “Up Link (UL) Packet Drop Rate or UL-PDR” — to measure overall packet loss or drop in both downlink and uplink at PDCP (Packet Data Convergence Protocol) layer.

Trai also decided to prescribe benchmarks as less than or equal to two per cent for both the parameters, the statement said.

“Packet” is a unit of data that is packaged for transmission over a packet-switched network

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14 Comments on "Trai Issues Directions to Measure Quality of VoLTE Services"


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s.santra , bally-howrah, wb
August 1, 2018 6:00 pm 6:00 PM

Airtel Volte in Kolkata circle is very much unreliable, also in full signal strength. Calls goes silent, or one party mute problem. Still immature than Jio Volte. Jio volte problem starts in low signal, one or two bar. Voices gets delayed or muted.

August 1, 2018 5:34 pm 5:34 PM

Offtioic – on my Redmi 5 pro getting volte sign of Airtel how is Airtel volte in Mumbai ??? Just to know

Nikhil Mumbai-Pune
August 1, 2018 6:50 pm 6:50 PM

Very pathetic in my honest opinion. Tried it on Redmi Note 4 and Samsung Galaxy J7 Pro. Network itself is pathetic. What can you expect from VoLTE. Jio and Vodafone going same way but still usable. If Vodafone doesn’t launch 4G band 41 then it’s over for them. Airtel and Jio might add at least 10-10 MHz in band 40 and Jio will add 5-10Mhz in band 5. So there will be good days for Jio. Also Jio will be looking forward to add band 41/1/3 in upcoming auction.

Tushar Malhotra Ludhiana Punjab
August 1, 2018 4:40 pm 4:40 PM

I am using Jio as my primary number.
I recently went to roaming area from Punjab circle to Haryana and Delhi circle.
I have Redmi 3S Prime.
I faced a lot of VoLte issues in Haryana.
Volte getting off and not coming back. Got to restart the phone.
Why did this happened? On my dad’s number, he didn’t faced any kind of issue.
Didn’t faced problem in Delhi circle though.
But speed in Delhi was very very poor. Never got speed above 4Mbps.

Nikhil Mumbai-Pune
August 1, 2018 6:52 pm 6:52 PM

Flash room,you might never see problem again.

August 1, 2018 5:32 pm 5:32 PM
U might be on older version on Redmi 3s prime ..earlier in 2017 I faced same issues … When I was using Redmi 3s prime in 2017 in Jan to march I had same issues and My voice not going to who calling me when I received call. Then I went service center to visit and after 4 times visit to center they changed some like Mic of my phone and after some updates I was too happy … The Redmi 3s prime had a mic issues since launch and after updates on Miui it got over later … Request… Read more »
August 1, 2018 4:53 pm 4:53 PM

It’s a redmi phone issue for volte going on & off. Call muting after few seconds. Same faced by me last year . Phone software issue.

Less speed is jio congestion issue.

August 2, 2018 7:07 am 7:07 AM

That has solved post Miui updates ..and issue of 3s prime specifically also… I had to change one part of phone as I said in post that results in I have no issues in volte now .than earlier