How Many Transmission Reception Points to Deploy in a User-Centric Distributed Massive MIMO Network?

User-centric distributed massive multiple-input multiple-output (D-mMIMO), or cell-free massive MIMO, is a novel wireless technology that improves spectral efficiency and provides uniform coverage in sixth-generation mobile networks (6G). However, properly dimensioning the amount of transmission and reception points (TRPs) for effective network operation is still a challenge. Unlike traditional cellular systems, the user's equipment can connect to multiple TRPs, leading to dynamic connections. This paper presents a methodology to estimate the minimum number of TRPs required in UC D-mMIMO systems, considering realistic user distribution and TRPs' unique coverage constraints. Results are presented for downtown and residential urban scenarios.