Composite Pilot Sequence Processing to Reduce Grant-Free Collisions
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Solution Overview
Problem
Pilot collisions are severe in grant-free transmission systems with a large number of access users, affecting the performance of contention-based grant-free transmission.
Innovation Solution
A signal processing method that combines N first sequences to generate a second sequence, which is used to create a signal, reducing the probability of pilot collisions through code-division or non-orthogonal pilot transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of access users is increased in grant-free transmission, then the system capacity is improved, but pilot collisions become more severe
Solution Approach 1:
The patent segments the original pilot sequence into multiple first sequences and combines them through code-division to generate a second sequence. This segmentation approach increases the total number of available pilot sequences, allowing more users to access the system simultaneously while reducing collision probability through the expanded sequence space.
Solution Approach 2:
The patent creates composite pilot sequences by combining multiple first sequences using code-division multiplexing. The second sequence is formed as a composite of N first sequences, where N≥2. This composite structure increases the effective number of pilots available for contention-based grant-free transmission, thereby supporting more access users while maintaining low collision rates.
2Ease of manufacture
If traditional pilot-based contention-based grant-free transmission is used, then the implementation is simple, but the number of access users is limited due to pilot collisions
Solution Approach 1:
The patent enhances the universal applicability of grant-free transmission by making the code-division combination method applicable to pilot-based contention-based scenarios. The solution works across different user densities and maintains compatibility with existing grant-free frameworks while extending the system's user capacity through the composite sequence generation approach.
Data Source
AI summary
Provided are a signal processing method and apparatus, a first communication node, a second communication node, and a storage medium. The signal processing method includes acquiring N first sequences, combining the N first sequences to obtain a second sequence, and generating a signal according to the second sequence. N is an integer greater than or equal to 2.