NOMA Waveform Allocation for Channel-Adaptive UE Signal Separation
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Solution Overview
Problem
Conventional non-orthogonal multiple access (NOMA) schemes in wireless communication systems, such as MUST, optimize waveforms based on user location relative to the transmitter, neglecting channel characteristics and mobility, leading to inefficient data transmission and increased interference.
Innovation Solution
Implementing independent waveforms optimized for the channel characteristics and mobility of each user equipment (UE) prior to superposition, using different waveforms for each UE's data signal to enhance signal separation and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single common waveform is used for all UEs in NOMA transmission, then device complexity is reduced and ease of operation is improved, but data transmission efficiency deteriorates and interference between users increases
Solution Approach 1:
The patent segments the common waveform into multiple independent waveforms, each optimized for specific UE groups. Instead of using a single waveform for all users, the system divides waveforms into at least a first waveform for near UEs and a second waveform for far UEs, allowing each group to have customized waveform characteristics that match their channel conditions, thereby improving transmission efficiency without significantly increasing overall system complexity
Solution Approach 2:
The patent applies local quality by assigning different waveform characteristics to different UE groups based on their specific channel conditions and locations. Near UEs receive waveforms optimized for their strong signal conditions, while far UEs receive waveforms optimized for weak signal conditions, ensuring that each local group operates with optimally tailored waveforms rather than a one-size-fits-all approach
2Ease of operation
If waveforms are optimized for user location relative to transmitter, then ease of operation is improved, but reliability deteriorates due to neglecting channel characteristics and mobility
Solution Approach 1:
The patent introduces dynamics by making waveform assignment adaptive to changing channel conditions and UE mobility states. Instead of static location-based waveform assignment, the system dynamically adjusts waveform allocation based on real-time channel characteristics, mobility information, and signal quality metrics, ensuring reliable transmission even as UEs move and channel conditions change
Solution Approach 2:
The patent implements feedback mechanisms where the system continuously monitors channel characteristics, signal quality, and transmission performance, then uses this feedback to adjust waveform assignments and power allocation. This closed-loop approach ensures that waveform optimization remains aligned with actual channel conditions, maintaining high reliability despite changes in user location and mobility
3Productivity
If independent waveforms optimized for each UE are used, then data transmission efficiency is improved and interference is reduced, but device complexity and signaling overhead increase
Solution Approach 1:
The patent applies universality by creating a multi-functional waveform system where a limited set of standardized waveforms serves multiple UE groups with different characteristics. Rather than designing completely custom waveforms for each UE, the system uses a universal framework with configurable waveform parameters that can be adapted to serve near UEs, far UEs, and various mobility scenarios, reducing overall complexity while maintaining efficiency benefits
4Ease of operation
If conventional NOMA schemes are used with single waveform, then ease of operation is maintained, but interference between users increases and transmission efficiency decreases
Solution Approach 1:
The patent introduces waveform diversity as an intermediary mechanism between users to reduce interference. By assigning different waveforms to different UE groups, the system creates waveform-level separation that acts as an intermediary layer of interference mitigation, complementing the existing power-domain NOMA separation and providing additional degrees of freedom for interference management without fundamentally changing the NOMA operation
Data Source
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.