Downlink HeNB/eNB ICIC with no direct cooperation capabilities Sample Clauses

Downlink HeNB/eNB ICIC with no direct cooperation capabilities. In [ARTD13], we have presented a power setting strategy for HeNB deployments in order to protect the macro UE located outside and close to a building of a HeNB. We define a high interference zone (HIZ) as the locations where eNB UEs experience a SINR bellow a given threshold. In our scenario, the SINR mainly depends on the useful signal power received by the eNB, on the interference received by the HeNB, and also on the interference from the neighboring macro stations. We neglect the impact of the other HeNBs by observing that the coverage of a HeNB is limited, which induces that the probability to be interfered by more than one HeNB is low. By consequence, when all HeNBs are set with the same transmit power, the HIZ area varies with the position of the HeNB. For HeNBs deployed at the cell center, the HIZ is small because the eNB useful power is large with respect to the interference from the other nodes and from the HeNB. For HeNBs deployed at the cell edge, the HIZ is large since the impact of the HeNB on the SINR is non-negligible for eNB-UEs located around the HeNB. Thus, a first strategy is to try to equalize the size of the HIZ so that each HeNB has an equivalent impact on the eNB UEs, and to tune the power control strategy so as to reach a target trade-off between the eNB and HeNB network cell edge throughput. As introduced in [ARTD13] and further developped in [GUI11-1], we first compute a function g() as the macro performance degradation in the HIZ gP , I, Psol = SINR P /SINR 0. where M SINRM t, F P = t ,F M N  I t, F M PM ,  P G O t ,F F and where Pt , F is the transmit power of the most interfering HeNB for a given eNB-UE, GF the path gain from this HeNB to the eNB-UE, PM is the received power from the eNB, N the constant AWGN power level at the UEs, and IO the interference power level received from other eNBs. As a remark, SINRM 0 denotes the SINR of the eNB-UE when the HeNB is turned off. Then, we compute the HeNB transmit power for a target macro performance degradation gth.