4
Cross-tier Interference Management in 3GPP LTE-Advanced Heterogeneous Networks
4.1 Introduction
Interference management (IM) techniques are one of the key enablers in next-generation mobile networks, such as the evolved universal terrestrial radio access network (E-UTRAN), also known as the third generation partnership project (3GPP) long-term evolution (LTE). In broadband wireless communication systems under a single-frequency network (SFN) deployment, the achievable system capacity is usually limited by the inter-cell interference (ICI). The ICI problem is even more severe in heterogeneous networks (HetNet), since the interference environment is more complicated than that in the homogenous networks (HomoNet) due to the coexistence of different kinds of E-UTRAN nodeBs (eNB) in HetNet deployments. More specifically, the ICI in HetNets is typically a combination of different cell tiers, for example the high-power node (HPN) tier and the low-power node (LPN) tier. An HPN is typically a macro eNB (MeNB), while an LPN can be a pico eNB (PeNB), or a femto eNB (FeNB), which is also often referred to as a home eNB (HeNB).
Aiming at mitigating the ICI problem, especially in HetNet, significant improvements have been made in the evolved version of LTE, namely the LTE-Advanced system (also known as LTE Release-10) during the 3GPP standardization process. In this chapter, we will discuss the interference management ...
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