Superposed Transmission Power Split Ratio Selection
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Solution Overview
Problem
Existing LTE systems face limitations in multiplexing users effectively due to fixed power split ratios in non-orthogonal multiple access (NOMA)/multi-user-superposed-transmission (MUST) techniques, which restrict flexibility and fairness in capacity allocation between far and near user equipments.
Innovation Solution
The method involves selecting a super-constellation and determining a power split ratio to choose a subset of modulation constellations for users, allowing for dynamic power allocation by reusing existing LTE constellations and enabling flexible power scaling, thereby improving link capacity and fairness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If fixed power split ratios are used in NOMA/MUST techniques, then implementation is simplified, but flexibility and fairness in capacity allocation between far and near user equipments deteriorates
Solution Approach 1:
The patent implements dynamic power allocation by allowing user equipments to autonomously select power split ratios from a predefined set based on their channel conditions and traffic requirements. This transforms the static, fixed power split ratio into a dynamic parameter that adapts to varying system conditions, thereby improving flexibility and fairness while maintaining implementation simplicity through a standardized selection mechanism.
Solution Approach 2:
The patent changes the power split ratio parameter from a fixed value to a selectable set of values, enabling user equipments to adjust the power allocation parameter according to their specific needs. This parameter change allows the system to achieve both simplicity (through standardized options) and flexibility (through autonomous selection), resolving the technical contradiction between ease of operation and adaptability.
2Adaptability or versatility
If dynamic power allocation is implemented, then flexibility and fairness in capacity allocation is improved, but system complexity increases
Solution Approach 1:
The patent implements partial dynamic power allocation by providing a predefined set of discrete power split ratio options rather than allowing continuous adjustment. This partial action approach maintains flexibility and fairness improvements while limiting system complexity by constraining the selection space to standardized options, thus resolving the contradiction between adaptability and device complexity.
Solution Approach 2:
The patent uses a standardized, predefined set of power split ratio values that can be independently selected and discarded based on current conditions. This approach allows the system to achieve dynamic allocation benefits without the complexity of real-time optimization algorithms, as each power ratio option is a self-contained, pre-computed value that requires minimal processing to select and apply.
3Device complexity
If existing LTE constellations are reused, then implementation complexity is reduced, but power scaling possibilities are restricted
Solution Approach 1:
The patent makes existing LTE constellations serve multiple functions by enabling their reuse for both traditional orthogonal multiplexing and NOMA/MUST superposed transmission. By demonstrating that the same constellation structures can support different power allocation schemes and user pairing strategies, the patent achieves universality that reduces implementation complexity while expanding power scaling possibilities through flexible superposition of multiple users on the same resources.
Data Source
AI summary
One embodiment is directed to a method comprising deciding to multiplex the data of at least two users within a super-constellation; determining the power split ratio among the at least two users; selecting a super-constellation; and based on the determined power split ratio, choosing a subset of the super-constellation points forming the superposition of modulation constellations of the at least two users.