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Semi-dynamic User-Specific Clustering for Downlink Cloud Radio Access Network | IEEE Journals & Magazine | IEEE Xplore

Semi-dynamic User-Specific Clustering for Downlink Cloud Radio Access Network


Abstract:

This paper studies user-specific clustering for a downlink cloud radio access network (C-RAN), where a central unit (CU), connected to all base stations (BSs) via limited...Show More

Abstract:

This paper studies user-specific clustering for a downlink cloud radio access network (C-RAN), where a central unit (CU), connected to all base stations (BSs) via limited-capacity backhaul links, coordinates the BSs to form cooperative clusters for every user. By taking into account the training overhead for channel estimation in C-RAN, we design the clustering scheme aimed at maximizing the average net throughput of the network subject to the constraint on backhaul capacity, where a hybrid coordinated multipoint (CoMP) transmission mode is considered. The proposed clustering scheme can be operated in a semi-dynamic manner merely based on large-scale channel information, has low computational complexity, and performs close to the optimal scheme found by exhaustive searching. Under two special cases where the backhaul capacity is very stringent and unlimited, the proposed scheme is then tailored for pure coordinated beamforming (CB) mode and pure joint transmission (JT) mode to further reduce the clustering complexity. Simulation results show that the proposed semi-dynamic clustering schemes are superior to the dynamic clustering scheme due to the reduction of required training overhead.
Published in: IEEE Transactions on Vehicular Technology ( Volume: 65, Issue: 4, April 2016)
Page(s): 2063 - 2077
Date of Publication: 12 May 2015

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I. Introduction

The telecom industry has been witnessing a traffic explosion in recent years and has reached a broad consensus on the strong continuation of this trend for the next decade. To meet the ever-demanding expectations of mobile broadband users in fifth generation (5G), network densification and cloud radio access network (C-RAN) are recognized as two key enabling technologies [1]. By centralizing the baseband processing resources of all base stations (BSs) into a super resource pool at a central unit (CU) and incorporating coordinated multipoint (CoMP) transmission techniques, C-RAN can significantly improve the system performance with affordable cost [2].

References

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