Investigation of multiple access interference within UTRA-TDD

This paper highlights inter-cell and inter-operator interference which can occur within a UTRA-TDD system. Interference simulation results show that when the network has frame synchronisation and operates with the same asymmetry in all cells, there will be interference between the base stations and adjacent mobiles only (i.e. MS-BS and BS-MS interference). When synchronisation is lost, or different asymmetries are used, the results indicate the extent of the additional interference between adjacent base stations (BS-BS interference) and between adjacent mobile terminals (MS-MS interference). Further results for interoperator interference shows that the interference at the mobiles caused by synchronised operators is dominated by interference from the base station, whereas for unsynchronised networks the MS-MS interference becomes significant.