Adaptive DMRS Mapping for Wireless Uplink Contention
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in contention-based uplink transmission and reception, particularly in scenarios requiring high mobility and reliability, such as 5G networks, due to DMRS collisions and limitations in multiplexing capacity.
Innovation Solution
The method involves selecting and transmitting demodulation reference signals (DMRS) and uplink data using an orthogonal multiple access (OMA) and non-orthogonal multiple access (NOMA) schemes, respectively, with adaptive mapping between codewords and DMRSs based on collision occurrence, allowing for increased multiplexing capacity and improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DMRS is transmitted using orthogonal multiple access (OMA) scheme, then interference between reference signals is reduced, but multiplexing capacity is limited
Solution Approach 1:
The patent combines OMA and NOMA schemes in a hybrid approach where DMRS is transmitted using OMA for reliable channel estimation, while uplink data utilizes NOMA for enhanced multiplexing capacity. This merging allows the system to achieve both reliable reference signal transmission and high user data throughput by leveraging the strengths of both access methods.
2Reliability
If adaptive mapping between codewords and DMRSs is implemented, then performance in collision scenarios is improved, but system complexity increases
Solution Approach 1:
The patent implements dynamic adaptive mapping where the mapping relationship between codewords and DMRSs is changed based on detected collision conditions. When DMRS collisions are detected in the contention resource region, the system adaptively adjusts the mapping scheme to resolve conflicts, transforming a static mapping approach into a dynamic one that responds to real-time channel conditions and collision patterns.
Solution Approach 2:
The system employs feedback mechanisms where the base station detects DMRS collisions and provides information back to user equipment about collision conditions. This feedback enables user equipment to adaptively select appropriate codeword-DMRS mapping configurations, creating a closed-loop system that continuously optimizes performance based on observed collision patterns and system state.
3Quantity of substance
If multiple codewords are mapped to single DMRS, then multiplexing capacity increases, but measurement precision deteriorates
Solution Approach 1:
The patent applies local quality by assigning different mapping configurations to different spatial locations, user groups, or resource regions. Instead of uniformly mapping multiple codewords to single DMRS across the entire system, the mapping strategy is locally optimized based on specific conditions such as user equipment location, channel characteristics, or collision patterns, thereby maintaining measurement precision in critical areas while achieving high multiplexing capacity in others.
Data Source
AI summary
A method for performing, by a terminal, a contention-based uplink transmission in a wireless communication system, according to one embodiment of the present invention, comprises the steps of: selecting any one of a plurality of codewords and any one of a plurality of demodulation reference signals (DMRS), the plurality of codewords and the plurality of DMRSs being set in a contention resource area for a contention-based uplink transmission; and transmitting, through the contention resource area, uplink data that corresponds to the selected codeword, and the selected DMRS, wherein the DMRS is transmitted in an orthogonal multiple access (OMA) scheme, the uplink data is transmitted in a non-orthogonal multiple access (NOMA) scheme, and the selected DMRS is one of the K DMRSs mapped to the selected codeword, wherein K may be an integer greater than or equal to 1, which is changed according to a DMRS collision occurring in the contention resource area.