TRAI Assesses Mobile Network Quality Across Lunglei, Lawngtlai and Siaha Districts and adjoining areas in the State of Mizoram under North East LSA
The Telecom Regulatory Authority of India (TRAI) has released findings of Independent Drive Test (IDT) conducted across Lunglei, Lawngtlai and Siaha Districts and adjoining areas in the State of Mizoram under North East LSA, during the month of May 2026, for information of general telecom consumers. The purpose of this drive test is to assess and verify real time quality of mobile network services (both voice & data) provided by Telecom Service Providers (TSPs). During the IDT, TRAI captures performance of TSPs for key Quality of Service (QoS) parameters like Coverage, Call Drop Rate (CDR), Call Setup Success Rate (CSSR), data Download (DL) and Upload (UL) throughput etc., which are then published to inform Consumers and encourage TSPs to improve their services.
These IDTs have been designed to capture on ground mobile network performance of all TSPs across diverse usages environment like cities, hotspots, public transport hubs, etc. In this type of drive testing, live data and voice sessions are established using SIM cards from all TSPs over 2G, 3G, 4G, and 5G networks. Multiple advanced test handsets are used, and the sessions are monitored and analysed in real-time using advanced Software Systems.
TRAI, through its appointed agency, conducted drive tests across City drive – 342.4 KMs, Hotspot locations - 11, Walk Test – 1.3 KMs in Mizoram State during 20th May 2026 to 23rd May 2026 in North East LSA. These tests were conducted under the supervision of the TRAI Regional Office Kolkata. The observations presented in drive test reports represent the performance of the TSPs on the area/ route under test on the day/ time of conducting the drive test.
Drive Test Route Map: The following map provides overview of drive test routes indicating City drive, Inter-operator calling, Hotspots and Walk tests, as per the legends shown on the map: -
Key Parameters Assessed
- Coverage Gap: Percentage of samples, for which signal strength observed less than the minimum prescribed signal strength for respective technology (2G/ 3G/ 4G/ 5G).
- Voice Services: Call Setup Success Rate (CSSR), Drop Call Rate (DCR), Call Setup Time, Call Silence Rate, Speech Quality (MOS).
- Call Silence Instance: Number of call silence instance occurred during the calls.
- Data Services: Download/ Upload Throughput, Latency, Jitter, Packet Drop Rate
The overall mobile network performance in Lunglei, Lawngtlai and Siaha Districts and adjoining areas for the key parameters has been summarised below: -
a) Coverage Gap - The signal strength observed during voice testing on the city drive test route in auto-selection mode (5G/4G/3G/2G), measured as the number of samples having poor signal strength out of the total samples collected, was 11270/ 46398 for Airtel, 17449/ 32964 for BSNL, 11790/ 47107 for RJIL and 14928/ 26469 for VIL. Details of the coverage gaps have been provided in the map Annexed.
b) Dropped Calls - Dropped calls, measured as the number of dropped calls out of the number of successfully established calls, were 21/ 334 for Airtel, 50/ 222 for BSNL, 7/ 344 for RJIL and 46/ 207 for VIL. Details of the dropped call locations have been provided in the map Annexed.
c) Call Silence Instance - Call silence instances, measured as the total number of silence instances observed for > 3 seconds out of the total calls established, were 45/ 310 for Airtel, 7/ 151 for BSNL, 34/ 331 for RJIL and 4/ 121 for VIL. Details of the call silence instance locations have been provided in the map Annexed.
d) Data Download and Upload Throughput:
i) Data Download performance (Overall): Average download speed was observed as 59.88 Mbps for Airtel (5G/4G), 5.46 Mbps for BSNL (4G/2G), 69.89 Mbps for RJIL (5G/4G) and 16.05 Mbps for VIL (5G/4G/2G). Detail of Download throughput has been provided in the map Annexed.
ii) Data Upload performance (Overall): Average upload speed was observed as 11.83 Mbps for Airtel (5G/4G), 2.10 Mbps for BSNL (4G/ 2G), 5.22 Mbps for RJIL (5G/4G) and 3.43 Mbps for VIL (5G/4G/2G). Detail of Upload throughput has been provided in the map Annexed.
Locations of Dropped Calls and Call Silence instances can be seen by clicking red dot on the map Annexed.
Details of drive test route and area covered during the IDT is as under: -
a) City - The areas covered in the city drive are Buangpui, N.Mualthuam, Mausen, Thuampui, Lunglei, Thaizawl, Bualte, North Tawipui, Thingfal, Lawngtlai, Saikah, Kawlchaw East, Zero Point, Siaha, Chawntlangpui, Saizawh East, Ngengpuitlang, Lawnglang, Lawngtlaikai and Zochachhuah etc.in Cities and Adjoining areas of Lunglei, Lawngtlai and Siaha Districts.
b) Hotspot - The hot spot locations, capturing stationary user experience, are (i) Border Road Organisation Centre-Lawngtlai; (ii)D.C. Office L-III-Lawngtlai; (iii) District Court Building-Siaha; (iv) District Court-Lunglei; (v) District Hospital-Siaha; (vi) Government Siaha College NH 54B-Siaha; (vii) Lawngtlai Bazar National Highway 54-Lawngtlai; (viii) Lawngtlai District Hospital Chandmary-Lawngtlai; (ix) Lunglei Government College-Lunglei; (x) Postal Office of India Post Office Building NH2 Chandmary-Lawngtlai; (xi) Zotlang Higher Secondary School Serkawn-Lunglei
c) Walk Test - The walk tests conducted during 20th to 21st May 2026, covered (i) Civil Hospital-Lunglei and (ii) Government Lawngtlai College-Lawngtlai, capturing mobile network behaviour in crowded pedestrian environments.
The findings of this IDT report have been shared with respective TSPs for taking further necessary action at their end. Detailed reports of IDT are made available on the TRAI website at www.trai.gov.in. For any clarification or additional information, an email can be sent to adv.kolkata@trai.gov.in or Regional Office of TRAI at Kolkata RO can be contacted on telephone no. +91-33-22361401.
Click here to see Annexure
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