Radio Base Station Power Multiplexing Control for NOMA MIMO
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In next-generation mobile communication systems, combining Non-Orthogonal Multiple Access (NOMA) and Multiple-Input Multiple-Output (MIMO) leads to decreased throughput due to inadequate power multiplexing control, which is influenced by varying propagation environments.
Innovation Solution
A radio base station is designed to control power multiplexing for downlink signals transmitted to user terminals, setting appropriate multiplexing power ratios for each stream and providing necessary information for interference cancellation, allowing for efficient spatial multiplexing and proper operation of NOMA.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power multiplexing is applied to combine NOMA and MIMO, then spectral usage efficiency is improved, but throughput decreases due to inadequate power multiplexing control
Solution Approach 1:
The patent applies local quality by setting different multiplexing power ratios for different streams based on their specific propagation environments. The control section determines appropriate power ratios for each stream individually, allowing each stream to be optimized for its local channel conditions rather than using a uniform power allocation across all streams.
Solution Approach 2:
The patent implements dynamics by making the multiplexing power ratios adjustable and adaptable to varying propagation environments. The control section dynamically determines power ratios based on current channel conditions, enabling the system to respond to changing environmental factors and maintain optimal performance.
2Use of energy by moving object
If power multiplexing is applied to combine NOMA and MIMO, then spectral usage efficiency is improved, but reception quality becomes dependent on varying propagation environments
Solution Approach 1:
The patent addresses reliability by optimizing power allocation for each stream according to its specific propagation environment. The control section determines multiplexing power ratios that account for individual stream conditions, ensuring that each stream receives appropriate power levels tailored to its local channel characteristics.
Solution Approach 2:
The patent applies parameter changes by adjusting the multiplexing power ratios based on propagation environment conditions. The control section modifies power allocation parameters dynamically to adapt to varying channel conditions, thereby maintaining stable reception quality across different environments.
3Device complexity
If uniform power allocation is used in NOMA-MIMO, then system complexity is reduced, but throughput decreases in challenging environments
Solution Approach 1:
The patent resolves this contradiction by implementing local quality through stream-specific power ratio determination. The control section sets multiplexing power ratios individually for each stream based on propagation environment assessments, achieving optimized throughput in challenging environments without requiring overly complex uniform allocation mechanisms.
Solution Approach 2:
The patent applies dynamics by implementing adaptive power allocation that adjusts multiplexing power ratios based on assessed propagation environments. This dynamic approach allows the system to maintain relatively simple control structures while achieving improved throughput performance through environment-aware power distribution.
Data Source
AI summary
To suppress decrease in throughput even in the case of combining NOMA and MIMO to use, a radio base station according to one aspect of the present invention has a transmission section that transmits a DL signal to each of a plurality of user terminals with a single or a plurality of streams, and a control section that controls so as to perform power multiplexing on DL signals transmitted to the user terminals to transmit, where the control section sets a multiplexing power ratio of the DL signals to perform power multiplexing for each stream.