Macro Muting Cross-tier Interference Coordination Research Based On Adaptive CQI Hysteresis In Hspa Heterogeneous Network

As the demand for communication services increase, the communication technology with high data rate as well as high performance attracts more and more people’s attention. The third generation partnership (3GPP) is not only the constitutor of the first set of WCDMA standard, but also the leader of the process of HSDPA/HSUPA standard. And with the growing prosperity of the services of3G, next few years data services will be rapid developed.In the traditional communication cellular network structure, users get communication services directly through Macro Base. But as the requirements for better communication increase, simple Macro Base cannot meet the increasing communication services and quality requirements. So developing Het-Net has not only perfect theory prospect, but also obvious reality advantages.In theory, it has already proved, that in hot spots setting up LPN station can ease the burden of Macro station and improve the community service performance, meanwhile users can get better service quality.Heterogeneous network (HetNet) has been studied earlier in the context of LTE. But lately, there are also some discussions about HetNet in HSPA. Cross-tier interference (CTI) is an annoying issue to be investigated in the co-channel HSPA HetNet (CHH) scenario. In this paper, we will focus on the downlink CTI problem in CHH and propose a solution to mitigate it. Our scheme involves the macro muting (MM) in which macro NodeB will mute itself at some certain sub-frames to reduce the CTI level in the system. We also enhance the MM scheme by introducing the adaptive CQI hysteresis (ACH) mechanism to avoid the issue that the low power node (LPN) in HetNet may use the improper CQI for transmitting when MM is implemented. Simulation results will show the benefits of our proposed scheme.