NOMA Shared-Resource Transmission With UE-Specific Waveforms
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Solution Overview
Problem
Conventional non-orthogonal multiple access (NOMA) schemes, such as MUST, face inefficiencies due to using a single waveform for all users and relying solely on geographical location for user grouping, which does not account for varying channel conditions and mobility, leading to sub-optimal performance and increased signaling overhead.
Innovation Solution
Employ independent waveforms optimized for individual user equipment (UE) channel characteristics and incorporate mobility-based user grouping to reduce signaling overhead and improve transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single waveform is used for all users in NOMA schemes, then device complexity is reduced, but transmission performance deteriorates due to inability to adapt to varying channel conditions
Solution Approach 1:
The patent segments the user group into different categories (e.g., near users and far users, or users with different mobility patterns) and assigns different waveforms to different segments. This allows each segment to use a waveform optimized for its specific channel conditions while keeping the overall system complexity manageable through structured segmentation.
Solution Approach 2:
The patent applies local quality by selecting waveforms based on local channel characteristics of each user or user group. Instead of using a uniform waveform across all users, the system adapts the waveform type (e.g., CP-OFDM, DFT-s-OFDM, FBMC) to match the specific propagation conditions, mobility state, and channel quality of each user segment.
2Ease of operation
If user grouping is based solely on geographical location, then ease of operation is improved, but transmission performance deteriorates due to ignoring mobility and channel conditions
Solution Approach 1:
The patent introduces dynamic user grouping that adapts to changing channel conditions and mobility patterns. Users are grouped not only based on static geographical location but also on dynamic parameters such as mobility state, channel quality, and Doppler spread, allowing the grouping structure to evolve with changing transmission conditions.
Solution Approach 2:
The patent changes the grouping parameters from purely geographical to a composite set including mobility metrics, channel quality indicators, and Doppler characteristics. This multi-parameter approach enables more accurate user grouping that reflects actual transmission conditions while maintaining operational feasibility through structured parameter selection.
3Reliability
If independent waveforms optimized for each UE are used, then transmission performance is improved, but signaling overhead increases due to additional waveform information that must be communicated
Solution Approach 1:
The patent merges the waveform selection decision with existing user grouping and resource allocation procedures. By combining waveform assignment with user grouping, the system reduces redundant signaling and integrates waveform information into the existing control plane procedures, thereby reducing overall signaling overhead while maintaining performance benefits.
Solution Approach 2:
The patent creates a unified user grouping framework that simultaneously handles multiple functions: user categorization, resource allocation, and waveform selection. This multi-functional approach eliminates the need for separate signaling for waveform information and leverages existing control structures to convey waveform assignments efficiently.
4Reliability
If mobility-based user grouping is implemented, then transmission performance is improved, but device complexity increases due to additional mobility measurement and processing requirements
Solution Approach 1:
The patent extracts mobility-related parameters (such as mobility state, Doppler spread, and velocity information) from the overall channel characterization and uses them as independent grouping criteria. By separating mobility parameters from general channel conditions, the system can implement mobility-based grouping using readily available measurements without requiring complex integrated processing.
Data Source
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AI summary
An apparatus serves a plurality of user equipments in a wireless communication system. For transmitting/receiving data of a plurality of user equipments, which include at least a first user equipment and a second user equipment, on resources shared by the plurality of user equipments, the apparatus transmits/receives a first data signal of the first user equipment and second data signal of the second user equipment using a non-orthogonal multiple access, NOMA, scheme. The first data signal and the second data signal are modulated using different waveforms prior to superposition of the first and second data signals.