Non-Orthogonal Multiple Access Terminal Grouping for Reference Symbol Allocation
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Solution Overview
Problem
Current wireless communication systems, particularly in next-generation 5G networks, face challenges in supporting massive connectivity due to restrictive connection density and high end-to-end latency requirements for massive machine-type communication services, where existing UE grouping and reference signal hopping schemes are inadequate.
Innovation Solution
A method for transmitting and receiving UE grouping information in a non-orthogonal multiple access system, where UEs sharing the same frequency resource are grouped based on data transmission rate, scheduling fairness, and timing distance, with allocated reference symbols to avoid overlap in the time domain, enabling efficient demodulation and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If reference symbols are allocated to multiple UEs sharing the same frequency resource, then connection density is improved, but reference symbol overlap occurs in time domain causing demodulation failure
Solution Approach 1:
The patent segments UEs into multiple groups based on timing distance characteristics, where each group is allocated dedicated reference symbols in specific time regions. This segmentation prevents reference symbol overlap while maintaining support for multiple UEs sharing frequency resources, thus resolving the contradiction between connection density and demodulation accuracy.
Solution Approach 2:
The patent introduces a new dimension of grouping based on timing distance to organize UEs. By creating distinct groups with different timing characteristics and allocating reference symbols accordingly in the time domain, the system enables multiple UEs to share frequency resources without reference symbol collision, improving connection density while preserving demodulation reliability.
2Quantity of substance
If more UEs are grouped together to support massive connectivity, then connection density is improved, but scheduling complexity increases
Solution Approach 1:
The patent divides the UE population into multiple groups based on timing distance characteristics. Each group can be scheduled independently with dedicated reference symbol allocations, which simplifies the overall scheduling complexity while still supporting a large total number of connected UEs, thus resolving the contradiction between connection density and scheduling complexity.
3Productivity
If reference symbols are allocated in overlapping time regions for different UE groups, then resource utilization is improved, but decoding error rate increases
Solution Approach 1:
The patent segments the time domain into distinct regions for different UE groups, allocating reference symbols to each group in non-overlapping time regions. This segmentation prevents reference symbol interference while maintaining efficient resource utilization by ensuring all UEs within a group can be served simultaneously, thus resolving the contradiction between resource utilization and decoding accuracy.
Data Source
AI summary
A method by which a base station transmits terminal grouping information in a non-orthogonal multiple access scheme can comprise the steps of: grouping terminals sharing the same frequency resource on the basis of any one of a data transmission rate requested by each terminal, scheduling impartiality among the terminal, and a timing distance of each terminal; and allocating reference symbols for each grouped terminal group such that the reference symbols do not overlap for each terminal group in a time domain.