Abstract
5G mobile communications introduce novel solutions to overcome the frequency spectrum’s shortage. It broadens the spectrum band to millimeter-waves, employs multiple numerologies to calculate subcarrier spacing, and supports various division duplex modes. Furthermore, the fifth generation of mobile networks intends to employ both, frequency division duplex, and time division duplex. This study focuses on Time Division Duplex (TDD) mode. Compared to the Frequency Division Duplex (FDD), the time duplex mode enhances flexibility and allows efficient frequency spectrum usage. However, the recent papers addressing resource scheduling issues for TDD duplex employ only the current classical schedulers, which were primarily designed for FDD mode, to accomplish radio resource allocation. In this paper, we compared the achievable throughput and data accumulated in the buffer of these schedulers to assess their suitability and compatibility with TDD specifications. The resulting performances show that an appropriate scheduler in line with TDD requirements should be implemented to exploit the available spectrum efficiently and reach the required throughput.
Highlights
Across the successive generations of mobile networks, radio resource management and optimal frequency spectrum utilization have always been the most crucial topics to tackle [1]
Since the Time Division Duplex (TDD) mode is suitable for both 5G NR frequency ranges, we evaluated the performances of the schedulers using two frequency bands, namely n41 for the FR1 and n257 for the FR2 [30]
This work studied the duplex modes supported by 5G NR, namely frequency division duplex and time division duplex
Summary
Across the successive generations of mobile networks, radio resource management and optimal frequency spectrum utilization have always been the most crucial topics to tackle [1]. The works [19], [20] published recently and addressing the time division duplex employ the classical scheduler, the Proportional Fair (PF), to ensure resource allocation for the users Based on these works, we decided to study the suitability of the classical schedulers, namely Round Robin (RR), Best CQI(BCQI), and Proportional Fair (PF), for the TDD mode. The fifth generation of mobile networks supports both duplexing FDD and TDD since it introduces various use cases and services demanding different requirements. It deploys the same frame structure for paired and unpaired modes, compared to LTE networks which employ different frame structures, type 1 and type 2, to perform FDD and TDD duplexing, respectively [21]
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