Base station placement for in-building mobile communication systems to yield high capacity and efficiency

A study is made of the problem of placing base stations to yield high capacity and efficiency in an in-building direct-sequence code-division multiple-access wireless communication system. A key requirement for solving this problem is a reliable but simple model of in-building propagation. A number of propagation models are considered as part of a system´s performance analysis and are found to produce widely ranging levels of accuracy. Correlated shadowing is identified as being a `key´in-building propagation characteristic that has the potential to strongly influence the system´s performance. Propagation models that included correlated shadowing are shown to produce the most accurate estimates of outage probability when there are a number of interferers facing a user. Base station deployment is shown to be a dominant factor influencing the levels of correlated shadowing, and consequently, base station deployment is shown to have major implications on the system´s performance. The system´s performance for a variety of base station deployment strategies has been determined. The results indicate that there is a tradeoff between system simplicity and performance