Główne pojęcia
NOMA assisted NGMA should have three key features: multi-domain utilization, multi-mode compatibility, and multi-dimensional optimality, to effectively support the key usage scenarios of IMT-2030 and beyond.
Streszczenie
The content discusses the design of next generation multiple access (NGMA) techniques for 5G and beyond wireless communication systems. It highlights three key features that NOMA-assisted NGMA should possess:
Multi-Domain Utilization:
Conventional NOMA and OMA focus on efficient use of a single resource domain (e.g., time, power).
NGMA should enable full multi-domain utilization, allowing users to access multiple time slots, power levels, and spatial beams.
This requires more complex multi-dimensional optimization compared to single-dimensional optimization.
Multi-Mode Compatibility:
NGMA should be compatible with existing multiple access techniques, enabling dynamic coexistence of different access modes.
The concept of hybrid NOMA is introduced, where OMA and NOMA can be flexibly combined to meet user requirements.
Multi-mode compatibility allows NGMA to be deployed in existing OMA-based networks without changing current standards.
Multi-Dimensional Optimality:
Multi-dimensional optimization, without constraints on single-domain access, can yield better performance than single-dimensional optimization.
However, multi-dimensional optimization problems are more challenging to solve than single-dimensional ones.
The content also discusses several open research problems for NOMA-assisted NGMA, including:
Enabling ambient IoT with zero-energy devices using backscatter communication
Addressing near-field communications and beam-focusing challenges
Exploiting heterogeneous user channel conditions
Achieving dynamic long-term system optimization using reinforcement learning
Statystyki
The content does not provide specific numerical data or metrics. It focuses on conceptual discussions and outlines research directions.
Cytaty
"for multiple access, technologies including non-orthogonal multiple access (NOMA) and grant-free multiple access are expected to be considered to meet future requirements"
"Hybrid NOMA can realize a harmonic and efficient integration of different multiple access techniques, where a user can freely choose a multiple access technique based on its own capability and quality of service requirements."