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Joint transmission with dummy symbols for dynamic TDD in ultra-dense deployments

Authors: Celik, Haris; Sung, Ki Won;

Joint transmission with dummy symbols for dynamic TDD in ultra-dense deployments

Abstract

Dynamic time-division duplexing (TDD) is considered a promising solution to deal with fast-varying traffic often found in ultra-densely deployed networks. At the same time, it generates more interference which may degrade the performance of some user equipment (UE). When base station (BS) utilization is low, some BSs may not have an UE to serve. Rather than going into sleep mode, the idle BSs can help nearby UEs using joint transmission. To deal with BS-to-BS interference, we propose using joint transmission with dummy symbols where uplink BSs serving uplink UEs participate in the precoding. Since BSs are not aware of the uplink symbols beforehand, any symbols with zero power can be transmitted instead to null the BS-to-BS interference. Numerical results show significant performance gains for uplink and downlink at low and medium utilization. By varying the number of participating uplink BSs in the precoding, we also show that it is possible to successfully trade performance in the two directions.

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Subjects by Vocabulary

Microsoft Academic Graph classification: business.industry Computer science Interference (wave propagation) Precoding Base station User equipment Transmission (telecommunications) Telecommunications link business Sleep mode Power control Computer network

Keywords

FOS: Computer and information sciences, Information Theory (cs.IT), Computer Science - Information Theory, Joint transmission; dummy symbols; dynamic TDD; ultra-dense network

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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