Nowadays, data traffic demand grows rapidly. Meanwhile
frequency resources is limited, coexistence network where LTE
femtocell share radio frequency with existing GSM is
suggested. Some problems need to be investigated in the
coexistence network i.e, the problem about mutual impact
between GSM macro and LTE femto on each performances and
how their performances system change due to various
deployment condition. In the previous study also does not
provide a clear and comprehensive solution. Thus, more metrics
need to be defined and compared in different scenarios.
Major concern of this study are to design frequency allocation
between GSM network and LTE femto. As well, to investigate
the mutual impacts between GSM network and LTE femto on
each performances. In this study, we focus on the uplink GSM
system. We simulate some scenarios in the coexistence
network, i.e heterogeneous macrocell size, heterogeneous reuse
factor, dynamic femtocell number and dynamic femtocell
position.
The performance of both systems is analyzed mathematically in
terms of SINR and femtocell throughput. Simulation is
employed to support analysis, the result shows that the
increasing femtocell number will decrease system performance.
In the mean time, femtocell position farther toward GSM BS
will decrease SINR GSM and increase SINR LTE femtocell and
throughput. In relation to the impact of macrocell size, the
bigger macrocell size which set off the impairment of SINR
GSM, the more increasing of SINR LTE femtocell and femtocell throughput. Generally, it can be seen that network
with smaller reuse factor provide an advance performance
rather than bigger reuse factor.
Keywords:
Frequency allocation, GSM, Integrated with, LTE femto.