Application segmentation of the Passive In‑Building Cellular Enhancement System market categorizes end‑use environments into commercial buildings, residential complexes, healthcare facilities, educational institutions, and transportation hubs. In commercial buildings—office towers, retail malls, and hospitality venues—the demand for reliable indoor coverage drives the largest market slice, accounting for roughly 35 % of total spend, as tenants and operators prioritize seamless connectivity for productivity and customer experience. Residential complexes follow with an estimated 25 % share, where multi‑unit dwellings adopt passive solutions to overcome penetration losses without incurring the operational costs of active repeaters. Healthcare facilities, constrained by strict electromagnetic compliance, allocate about 15 % of investments to passive systems that enhance emergency communication and patient monitoring. Educational institutions, including universities and K‑12 campuses, represent another 15 % as they retrofit legacy buildings to support digital learning. Transportation hubs—airports, train stations, and subways—comprise the remaining 10 %, reflecting the need for robust coverage in high‑traffic, structurally complex venues. This distribution is visualized in the accompanying pie‑chart, reinforcing the market taxonomy for application‑based analysis.