Dynamic Spectrum Sharing Using Puncturing and Rate-Matching
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Solution Overview
Problem
Current wireless systems, such as LTE and NR, face interference issues due to overlapping electromagnetic spectrum usage, leading to inefficient utilization of non-interfering NR resources, which prevents the use of certain NR resources to reduce complexity in User Equipment (UE).
Innovation Solution
The method involves processing transmissions in User Equipment (UE) that overlap with LTE CRS transmissions, including PDCCH DMRS and PDSCH transmissions, by using resource elements that do not overlap with LTE CRS, and employing puncturing or rate-matching techniques to handle overlapping resources, allowing for the use of previously unavailable NR resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If legacy NR systems avoid processing NR resources that overlap with LTE CRS to reduce UE complexity, then interference between NR PDSCH and LTE CRS is avoided, but non-interfering NR resources cannot be utilized
Solution Approach 1:
The patent applies local quality by differentiating the handling of resource elements based on their overlap status with LTE CRS. Non-overlapping resource elements are processed normally to maximize resource utilization, while overlapping resource elements are excluded or punctured to avoid interference. This selective processing approach allows the system to achieve both interference avoidance and improved resource utilization efficiency.
2Device complexity
If NR resources overlapping with LTE CRS are excluded from processing, then interference is avoided, but UE complexity reduction comes at the cost of losing access to additional non-interfering NR resources
Solution Approach 1:
The patent segments the NR resource elements into two categories: those that overlap with LTE CRS and those that do not. By segmenting the resources, the system can process non-overlapping elements while excluding overlapping elements, thereby maintaining low UE complexity while improving spectral efficiency through better resource utilization.
Solution Approach 2:
The patent changes the processing parameter for different resource elements based on their overlap status. Non-overlapping resource elements are processed with standard procedures, while overlapping resource elements are handled with exclusion or puncturing. This parameter-based differentiation enables the system to achieve both complexity reduction and improved spectral efficiency.
3Reliability
If rate-matching is performed around overlapping resources, then interference between NR PDSCH and LTE CRS is avoided, but the complexity of UE processing increases
Solution Approach 1:
The patent extracts or removes the overlapping resource elements from the processing set, rather than performing complex rate-matching operations around them. By taking out the problematic overlapping elements, the system avoids the complexity of rate-matching while still achieving interference avoidance through puncturing or exclusion of these elements.
Data Source
AI summary
A system and a method are disclosed for dynamic spectrum sharing. In some embodiments, the method includes: processing, by a User Equipment (UE), a first transmission overlapping, in an orthogonal frequency division multiplexing (OFDM) symbol and in a Resource Block (RB), a Long Term Evolution Cell Specific Reference Signal (LTE CRS) transmission, the first transmission including: a Physical Downlink Control Channel (PDCCH) Demodulation Reference Symbol (DMRS) transmission, or a Physical Downlink Shared Channel (PDSCH) DMRS transmission, or a PDCCH data transmission.