TRAI Assesses Mobile Network Quality from Lanka to Narainpur Railway Bridge along NH-27 & 627 in the State of Assam under Assam LSA

Information Note to the Press (Press Release No 71/ 2026) TELECOM REGULATORY AUTHORITY OF INDIA www.trai.gov.in New Delhi, 8 June 2026 For Immediate Release TRAI Assesses Mobile Network Quality from Lanka to Narainpur Railway Bridge along NH-27 & 627 in the State ofAssam under Assam LSA. The Telecom Regulatory Authority of India (TRAI) has released findings of Independent Drive Test (IDT) conducted from Lanka to Narainpur Railway Bridge along NH-27 & 627 in the State ofAssam under Assam LSA, during the month of March 2026, for information of general telecom consumers. The purpose ofthis 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. 2. These lDTs 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. 3. TRAI, through its appointed agency, conducted drive tests along National Highway-189.7 Kms, and Hotspot- 7 Locations in Assam State during I 01h March 2026 to I 811t March 2026 in Assam LSA. These tests were conducted under the supervision of the TRAI Regional Office Kolkata. The observations presented in drive test reports represent the performance ofthe TSPs on the area/ route under test on the day/ time ofconducting the drive test. 4. 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: ­ legends lnteroperator Hotspot Highway I ·'ltd••5. Key Parameters Assessed a) Coverage Gap: Percentage of samples, for which signal strength observed less than the minimum prescribed signal strength for respective technology (2G/ 3G/ 4G/ 5G). b) Voice Services: Call Setup Success Rate (CSSR)_, Drop Call Rate (OCR), Call Setup Time, Call Silence Rate, Speech Quality (MOS). c) Call Silence Instance: Number ofcall silence instance occurred during the calls. d) Data Servies: Download/ Upload Throughput, Latency, Jitter, Packet Drop Rate 6. The overall mobile network performance from Lanka to Narainpur Railway bridge along NH-27 & 627 for the key parameters has been summarised below: ­ a) Coverage Gap -The signal strength observed during voice testing on the city drive test route and highway 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 as detailed below- Parameter AIRTEL BSNL RJIL VIL Total Number ofSamples captured on Drive test route 23981 7964 23742 17252 Number ofSamples having poor signal strength 4820 6410 4453 10218 Details ofthe coverage gaps have been provided in the map Annexed. b) Dropped Calls -Dropped calls, measured as the number ofdropped calls out ofthe number of successfulliv establ. JS hed caIIs, were as shown beIo w. Parameter AIRTEL BSNL RJJL VIL Number ofsuccessful Calls Established 126 37 128 95 Number ofdropped Calls 9 12 14 21 Details ofthe 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 ofthe total calls established, were as shown below- Parameter AIRTEL BSNL RJIL VIL Call Established (within service provider network) 123 NA* 97 89 Number of silences calls for >3 Sec 7 NA* 4 2 Total number of silence instances for >3 Sec 8 NA* 6 2 Details ofthe 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 per below- Parameter Measured AIRTEL BSNL RJIL VIL in (upto SG) (upto 4G) (upto SG) (upto 4G) Typical Download throughput declared by (Mbits/s) 7.48 5.00 15.00 15.00 TSP Average Download Throughput measured (Mbits/s) 66.50 4.86 88.21 16.84 during IDT Detail ofDownload throughput has been provided in the map Annexed. 2ii) Data Upload performance (Overall): Average upload speed was observed as per below- Measured AIRTEL BSNL RJIL VIL Parameter in (upto SG) (upto 4G) (upto SG) (upto 4G) Typical upload throughput (Mbits/s) 1.92 3.00 7.00 8.00 declared by TSP Average Upload ,_ Throughput measured (Mbits/s) 13.63 3. 10 6.61 3.99 during IDT Detail of Upload throughput has been provided in the map Annexed. Locations ofDropped Calls and Call Silence instances can be seen by clicking red dot on the map Annexed. 7. Details ofdrive test route and area covered during the IDT is as under: ­ a) Highway -The areas covered in the HW drive are Lanka to Narainpur Railway bridge along NH-27; passing through Bamun Gaon, Dijabora, Mupa, Didaodip, Retzol and Damchara etc. b) Hotspot -The hot spot locations, capturing stationary user experience, are (i) 25.276104/ 93.147535, Lumding -Silchar Rd, Mai bang, (ii) 25.319575/ 93.125913, Lumding - Silchar Rd, Maibang, (iii) 25.4161 19/ 93.128289, Lumding -Silchar Rd, (iv) 25.598100/93.098873, Lumding - Silchar Rd, (v) 25.788690/ 93.147861, Lumding Rd (vi) 25.823535/ 93.098764, Lumding Rd, (vii) 25.878203/ 93.030952, Lumding Rd, Tiniali Bazar 8. The findings ofthis 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 ofTRAI at Kolkata RO can be contacted on telephone no. +91-33-22361401. l'( . llu_l~·~ Mukher~ Kaushik /. Advisor, RO Kolkmlfo~fll>l..6 3Annexure From Lanka to Narainpur Railway bridge along NH-27 & 627 (Highway Drive test) a) Coverage Gap – The coverage distribution found less than the minimum specified signal strength for the drive test route in auto-selection mode (5G/4G/3G/2G) during voice testing, is as below: Parameter AIRTEL BSNL RJIL VIL Total Number of Samples captured on Drive test 23981 7964 23742 17252 route Number of Samples having poor signal strength 4820 6410 4453 10218 Note: Signal strength has been considered poor if it falls below −110 dBm for 5G & 4G, −90 dBm for 3G, and −85 dBm for 2G. Coverage Gap observed AIRTEL BSNL RJIL VIL Note: Plot is based on Dynamic Drive Test results only 4b) Dropped Calls - The TSP-wise details of dropped calls in auto-selection mode (5G/ 4G/ 3G/ 2G) are as below: Parameter AIRTEL BSNL RJIL VIL Number of successful Calls Established 126 37 128 95 Number of dropped Calls 9 12 14 21 Locations of Dropped Calls AIRTEL BSNL RJIL VIL Note: Dropped calls locations are shown in red color and which can be clicked to know the exact location (latitude and longitude) on the map 5c) Call Silence Instance - The TSP-wise details of Call silence instance in Auto-selection mode (5G/4G) are as below: Parameter AIRTEL BSNL RJIL VIL Call Established 123 NA* 97 89 (within service provider network) Number of silences calls for >3 Sec 7 NA* 4 2 Total number of silence instances for >3 Sec 8 NA* 6 2 * NA – Not Applicable Locations of Call Silence Instance AIRTEL RJIL VIL Note: Call silence instances are shown in red colour and which can be clicked to know the exact location (latitude and longitude) on the map 6d) Data Download and Upload throughput: The TSP-wise details of Average Download (DL) and Upload (UL) throughput against declared typical DL/UL Throughput for month, in Auto- selection mode (5G/4G/3G/2G) are as below: (i) Download Throughput RJIL Measured AIRTEL BSNL VIL Parameter (upto 5G) in (upto 5G) (upto 4G) (upto 4G) Typical Download (Mbits/s) 7.48 5.00 15.00 15.00 throughput declared by TSP Average Download Throughput measured during (Mbits/s) 66.50 4.86 88.21 16.84 IDT AIRTEL BSNL RJIL VIL Note: Plot is based on Dynamic Drive Test results only 7(ii) Upload Throughput RJIL Measured AIRTEL BSNL VIL Parameter (upto 5G) in (upto 5G) (upto 4G) (upto 4G) Typical upload throughput (Mbits/s) 1.92 3.00 7.00 8.00 declared by TSP Average Upload Throughput measured during IDT (Mbits/s) 13.63 3.10 6.61 3.99 AIRTEL BSNL RJIL VIL Note: Plot is based on Dynamic Drive Test results only 8