IST-2003-507581 WINNER D2.5 v1.0 Duplex ... - Celtic-Plus

WINNER D2.5 v1.0Performance degradation increases as the number of crossed slots in the system increases, this is due tothe increased number of mobiles using crossed slots and thus the reduced separation between mobiles inthe UL to DL interference case and the increased DL transmission power in the DL to UL interferencecase.Case C can be more easily implemented since no knowledge is required of the switching point in theneighbouring cell, and multiple adjacent cells are accommodated.4.5.7.1 Further WorkIn order to make the analysis tractable and due to project constraints a number of simplifying assumptionshave been made. This section outlines further investigations that may be considered in other Winner workpackages.The analysis presented here considers only two cells. Future simulations should include a larger numberof cells and therefore interference cases. A network architecture including sectored cells should also bestudied.A system simulation using a more accurate channel model, especially for AP to AP interference, shouldbe investigated to show that DLUL interference is the dominant interference problem for scenarios ofinterest.The analysis presented in this section has considered two synchronised, non-overlapping, yetuncoordinated cells. A useful addition to the work would be to investigate whether a similar interferenceavoidance technique could be employed for the cells of two different operators using TDD. There are anumber of issues to be considered including ULUL and DLDL interference constraints when the twoAPs are not co-located.The concept may need to be developed depending on the multiple access and modulation schemesadopted by the Winner project.Page 83 (121)