A technical assessment conducted by the telecom regulator has found significant differences in interference levels across portions of the 900MHz spectrum, a development that could influence future spectrum allocation decisions and network expansion plans.
The findings emerged from a Proof of Concept (PoC) study carried out to evaluate cross-border frequency interference and determine the usability of spectrum blocks for mobile operators.
According to the assessment, one segment of the spectrum experienced substantial interference across large parts of the country.
The affected frequencies could impact mobile services in nearly half of Bangladesh`s geographical area, raising concerns over their commercial viability.
In contrast, another spectrum block showed relatively limited disruption. Interference in this segment was concentrated mainly in Rangpur, while most other regions remained largely unaffected.
The study estimated that the less-affected block would experience interference in only a small portion of the country, making it a more attractive option for telecom operators seeking additional low-band spectrum.
The report also identified several locations, including Dhaka`s Kachukhet and Cantonment areas and the entire Barishal division, where no interference was detected.
These areas were suggested as potential candidates for initial deployment.
To better understand the extent of cross-border frequency pollution, the committee recommended further field inspections and practical testing by the Bangladesh Telecommunication Regulatory Commission (BTRC).
Mobile operators that participated in the assessment also shared their observations.
Banglalink reported that it tested the full 8.4MHz spectrum block between 880MHz and 888.4MHz using its 2G network.
The company found heavy interference in the lower portion of the spectrum across several regions, including Chattogram, Sylhet, Mymensingh and Rangpur, along with parts of Dhaka, Rajshahi and Khulna.
The operator noted that the upper portion of the spectrum faced comparatively lower interference, with disruptions mainly confined to Rangpur and some border-adjacent areas.
Robi reached a similar conclusion in its submission. According to the operator, the lower block was usable in selected regions such as Dhaka, Khulna, Rajshahi and Barishal, while the higher-frequency block was suitable for deployment across most of the country except Rangpur.
The assessment comes as mobile operators continue to seek additional low-band spectrum to strengthen network coverage and improve service quality.
The issue has gained importance following the allocation of 700MHz spectrum through auction.
Earlier, Grameenphone acquired 10MHz in the band, while state-owned Teletalk later received an additional 10MHz allocation. Robi and Banglalink did not acquire spectrum in that frequency range.
Industry experts consider low-band frequencies such as 700MHz and 900MHz critical for expanding mobile connectivity because they provide wider coverage, better indoor signal penetration and improved service in rural and underserved areas while requiring fewer network towers.
The latest findings are expected to play an important role in future regulatory decisions regarding spectrum management and mobile network development in Bangladesh.
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