Bit-to-Symbol Mapping Using Multiple Base Constellation Maps
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional bit-to-symbol mapping methods in communication systems are not suitable for grant-free data transmission, where the number of users is uncertain, leading to inefficiencies and performance degradation.
Innovation Solution
A method and apparatus for bit-to-symbol mapping using multiple base constellation maps and determining priority and reliability of sub-channels to generate symbols, allowing for flexible and efficient data transmission in grant-free communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single constellation map is used for bit-to-symbol mapping in traditional grant-based communication systems, then the mapping process is simple and deterministic, but the system cannot adapt to grant-free transmission where the number of users is uncertain
Solution Approach 1:
The patent applies dynamics by making the constellation map selection adaptive rather than fixed. The system dynamically selects from multiple base constellation maps based on detected user presence and channel conditions, allowing the mapping process to adapt to the uncertain number of users in grant-free transmission while managing complexity through structured selection criteria
Solution Approach 2:
The patent changes the parameter of constellation map configuration by maintaining multiple base constellation maps with different properties. The system selects and combines these maps based on detected parameters such as user presence and channel state, enabling adaptation to grant-free scenarios without requiring a completely new mapping framework
2Reliability
If traditional bit-to-symbol mapping is used in grant-free systems, then the implementation is straightforward, but performance degrades when user conflicts occur
Solution Approach 1:
The patent segments the bit-to-symbol mapping process by dividing the input bit sequence into multiple groups and assigning different base constellation maps to different groups. This segmentation allows the system to handle multiple users and prioritize certain data streams, improving reliability during user conflicts while maintaining overall system capacity through parallel processing of segmented data
Solution Approach 2:
The patent applies local quality by assigning different constellation map properties to different segments of the bit sequence based on their priority and reliability requirements. High-priority data segments use constellation maps with better error performance, while lower-priority segments use maps that maximize overall capacity, thereby improving reliability without sacrificing system productivity
3Productivity
If multiple base constellation maps are used for mapping, then the system can adapt to grant-free transmission and improve performance, but the complexity of the mapping process increases
Solution Approach 1:
The patent applies preliminary action by pre-defining multiple base constellation maps with different properties before the actual transmission occurs. The system prepares these maps in advance and selects from them based on detected channel conditions and user presence, which reduces the complexity of real-time decision-making while still enabling high system capacity and adaptability to grant-free scenarios
Data Source
AI summary
Methods and communication apparatuses are presented for bit-to-symbol mapping. The method for bit-to-symbol mapping according to one example of the present invention includes: obtaining a plurality of base constellation maps; and mapping an input bit sequence by using the plurality of base constellation maps to generate symbols to be transmitted.