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Multi-cell Cooperation and interference Management

Interference Management in 5G HetNets_122422A
[Interference Management in 5G HetNets - Elsevier]


- Multi-tier Cooperative Architecture

With the growing demand for high bandwidth and high spectral efficiency, inter-cell interference (ICI) is becoming more and more severe, and ICI management plays an increasingly important role in mobile cellular networks. Existing ICI management schemes (4G/LTE mobile communication systems) may not be strong enough for 5G, which faces extremely severe ICI due to its ultra-dense network (UDN) topology.

Existing cellular wireless networks (4G/LTE) are facing fundamental challenges due to the exponential demand of mobile data traffic, the need of higher data rates, user coverage, lowering latency, and minimizing signaling overhead. In order to address these challenges, future cellular networks will require adopting a multi-cell multi-tier cooperative architecture. 

However, in multi-cell cooperation, the user equipment (UE) needs to estimate the channel state information (CSI) and feed it back to the base station (BS) scheduler for adaptive resource management. This results in a significant increase of signaling overhead and feedback latency into the cooperative networks. These overhead and latency are the two key challenges to achieve gains in coordinated multi-point (CoMP) operation. 


- Inter-cell Interference Coordination in 5G Ultra-dense Networks

The exponential growth in demand for mobile broadband communications has resulted in dense deployments of cellular networks with aggressive frequency reuse patterns. Fifth-generation (5G) networks are expected to overcome capacity and throughput challenges by adopting a multi-layer architecture in which multiple low-power base stations (BSs) are deployed within the coverage area of a macrocell. Therefore, inter-cell interference (ICI) caused by simultaneous use of the same spectrum in different cells poses a serious problem.

ICI reduces system throughput and network capacity, and negatively impacts cell edge users and overall system performance. Therefore, effective interference coordination techniques are required, especially for user-to-cell association and resource allocation, to mitigate the severe impact of ICI on system performance in 5G heterogeneous networks (HetNet).

This is to improve the quality of service (QoS) and maximize the system throughput, which is caused by the deployment of small base station coverage on the macro base station in the heterogeneous cellular network, which will be due to the different transmit power of different base stations in the downlink. As a result, the traffic load is unbalanced.

With the advancement of information and computer technology, the envisioned 5G wireless communication is expected to encompass unprecedented heterogeneous and ultra-dense communication environments. In-vehicle communication plays a vital role in 5G wireless networks and has been extensively studied in recent years due to its great potential in ensuring reliability and supporting smart transportation and various safety applications.



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