The practical realities of UTRA TDD and FDD co-existence and their impact on the future spectrum allocations

This paper presents some of the first published results of real UTRA TDD and FDD equipment performance in respect of co-siting. The relevant 3GPP specifications are examined in detail to see whether they guarantee co-existence and if not whether they are exceeded in practice. In conclusion, the paper shows that the necessary performance to facilitate co-existence, co-siting and indeed antenna sharing has already been achieved in practice. These results not only have implications on the coexistence discussions for new spectrum allocations for 3G, such as the IMT-2000 extension band, but also on new standards for these bands.