NCMA Uplink Codebook Selection for Latency and Throughput
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Solution Overview
Problem
Current wireless communication systems, such as 3GPP LTE, face challenges in reducing data request latency and supporting massive UE connectivity, which are essential for emerging applications like real-time control and tactile internet in 5G technology.
Innovation Solution
The implementation of a Non-Orthogonal Coded Multiple Access (NCMA) scheme in user equipment (UE) for uplink communication, using a codebook corresponding to a selected modulation scheme, allows for efficient resource mapping and IFFT transformation of signals, enabling superposition transmission for multiple users.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional orthogonal multiple access schemes are used, then system complexity is low and implementation is simple, but data request latency cannot be reduced to 1ms and massive UE connectivity cannot be supported
Solution Approach 1:
The patent applies dynamics by transitioning from static orthogonal resource allocation to dynamic non-orthogonal codebook-based resource allocation. The codebook contains multiple codewords that can be dynamically selected and combined based on channel conditions and traffic requirements, enabling the system to adaptively optimize latency performance while managing complexity through structured codebook design
Solution Approach 2:
The patent employs composite materials principle by combining multiple codewords from the codebook in superposition. Each codeword represents a different spatial or temporal signature, and their composite superposition allows multiple UEs to share the same time-frequency resources simultaneously, achieving massive connectivity and reduced latency through diversified signal composition
2Productivity
If orthogonal multiple access is used, then interference between users is minimized, but frequency usage efficiency is low and throughput is limited
Solution Approach 1:
The patent merges multiple user signals in the same time-frequency resources through non-orthogonal codebook superposition. By combining codewords from different UEs in a structured manner, the system achieves spectral overloading where more users can transmit simultaneously, directly increasing throughput and frequency usage efficiency beyond traditional orthogonal limits
Solution Approach 2:
The patent changes the fundamental parameter of resource orthogonality to non-orthogonality. By transforming the resource allocation paradigm from orthogonal to non-orthogonal codebook-based allocation, the system enables higher spectral efficiency and throughput while managing interference through codebook structure and receiver processing
3Quantity of substance
If non-orthogonal coded multiple access is implemented, then massive UE connectivity up to 1,000,000/km2 can be supported, but device complexity and processing requirements increase
Solution Approach 1:
The patent segments the codebook into multiple codewords with distinct spatial or temporal signatures. Each UE is assigned specific codewords from the segmented codebook, allowing the system to support massive connectivity by dividing the resource space into manageable segments that can be independently allocated and processed
Solution Approach 2:
The patent applies preliminary action by pre-defining the codebook structure and codeword assignments before actual communication occurs. The codebook is prepared in advance with optimized codewords that facilitate efficient processing, reducing real-time complexity at the UE while enabling massive connectivity through pre-planned resource allocation
Data Source
AI summary
Techniques for a user equipment to perform uplink communication in a wireless communication system. The user equipment performs operations that include: receiving configuration information for a codebook set related with a modulation scheme; receiving a UL grant including a specific codeword index; selecting a codebook based on the specific codeword index included in the codebook set; and transmitting data based on the selected codebook, wherein the codebook set includes a plurality of codebooks predefined for non-orthogonal coded multiple access (NCMA) scheme based communication, and wherein the codebook set is configured based on a spreading factor or an overloading factor.