Rate-Matching and Puncturing for Overlapping Frequency Resources
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Solution Overview
Problem
In existing LTE systems, spectral usage efficiency degrades when an interrupt occurs in frequency resources allocated to PDSCH/PUSCH channels due to the allocation of secondary signals like NB-IoT or NR-IoT, leading to underutilization of available frequency resources.
Innovation Solution
A user terminal with a transmission/reception section and control section that allocates frequency resources using a second allocation unit comprising multiple first allocation units, where rate-matching and/or puncturing are applied to the first signal when a second signal overlaps with the first signal, improving spectral usage efficiency by optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If another communication (NB-IoT/NR-IoT) is allocated to a part of an RBG allocated to PDSCH/PUSCH, then frequency resource allocation flexibility improves, but spectral usage efficiency degrades due to rate-matching and puncturing affecting entire RBGs
Solution Approach 1:
The invention divides the RBG into individual RB-level units for granular control. Instead of applying rate-matching or puncturing to the entire RBG when a second signal is allocated, the system identifies and processes only the specific RBs that overlap with the second signal allocation. This segmentation enables precise resource management where unaffected RBs remain fully available for the first signal, thereby maintaining spectral efficiency while accommodating flexible multi-communication allocation.
Solution Approach 2:
The invention applies different processing treatments to different parts of the frequency resources based on local conditions. Specifically, rate-matching or puncturing is applied only to the local RBs that are interrupted by the second signal, while other RBs within the same RBG continue to carry the first signal without degradation. This localized approach ensures that each region of the frequency spectrum is optimized according to its specific allocation status, preventing unnecessary resource wastage.
2Reliability
If rate-matching and puncturing are applied to entire RBG when partial interruption occurs, then signal integrity is maintained, but resource utilization efficiency deteriorates due to unnecessary resource wastage
Solution Approach 1:
The invention segments the RBG into individual RBs and applies rate-matching or puncturing only to the specific RBs that are interrupted by the second signal. This granular approach maintains signal integrity for affected RBs while preserving full resource utilization in unaffected RBs, thereby resolving the contradiction between reliability and productivity.
Solution Approach 2:
Instead of applying rate-matching or puncturing to the entire RBG (excessive action), the invention applies these processing techniques only to the minimum necessary RBs that are actually interrupted by the second signal (partial action). This reduces unnecessary processing overhead and resource wastage while still ensuring signal integrity where needed.
Data Source
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AI summary
To improve spectral usage efficiency in the case where an interrupt by a second signal occurs in a part of frequency resources allocated to a first signal, in one aspect of the present invention, in the case where frequency resources for the first signal are allocated using a second allocation unit comprised by including a plurality of first allocation units that are minimum allocation units, and in the case where the second signal is allocated to a part of the frequency resources, in a subcarrier at least a part of which overlaps with the second signal, or in the first allocation unit at least a part of which overlaps with the second signal, the first signal is subjected to rate-matching and/or puncturing.