CRS Rate Matching Switching for Dynamic Spectrum Sharing
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Solution Overview
Problem
Existing 3GPP standards for CRS rate matching in DSS are limited by slow RRC-based reconfiguration, which fails to adapt quickly to changing conditions, leading to potential missed opportunities during brief transmissions and increased interference.
Innovation Solution
Implement fast CRS rate matching selection using DCI-based indications and MAC layer commands to dynamically adjust CRS rate matching configurations, allowing for rapid switching between patterns based on load, interference, and channel conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RRC-based reconfiguration is used for CRS rate matching, then the configuration is stable and reliable, but the reconfiguration time is long and cannot adapt quickly to changing conditions
Solution Approach 1:
The patent segments the rate matching configuration into two parts: semi-static parameters configured via RRC signaling and dynamic parameters indicated via DCI. This allows the stable RRC configuration to remain while adding fast DCI-based adjustments, resolving the contradiction between reliability and speed.
Solution Approach 2:
The patent introduces dynamic rate matching indication through DCI fields that can rapidly switch between different rate matching patterns. This dynamic layer operates on top of the static RRC configuration, enabling quick adaptation to changing channel conditions and interference scenarios without compromising the underlying stable configuration.
2Speed
If fast DCI-based rate matching switching is implemented, then the adaptation speed increases, but the device complexity and processing overhead increase
Solution Approach 1:
The patent applies local quality by having the WD process only the relevant DCI fields for rate matching indication rather than parsing entire messages. The DCI contains targeted information about which rate matching pattern to use, reducing processing complexity while maintaining fast switching capability.
Solution Approach 2:
The patent uses preliminary action by pre-configuring multiple rate matching patterns via RRC signaling before runtime. When DCI indicates a specific pattern, the WD can immediately apply the pre-configured parameters without real-time computation, reducing processing complexity during fast switching.
3Adaptability or versatility
If multiple rate matching patterns are configured, then the adaptability to different scenarios improves, but the signaling overhead and configuration complexity increase
Solution Approach 1:
The patent makes the rate matching configuration universal by designing DCI fields that can indicate different rate matching patterns through a unified mechanism. The same DCI structure handles various scenarios (different MBSFN configurations, different CRS patterns) without requiring separate signaling for each case, reducing overall signaling overhead.
Solution Approach 2:
The patent applies equipotentiality by ensuring all configured rate matching patterns have comparable configuration structures and parameters. This allows the WD to efficiently compare and select between patterns using simple criteria defined in the DCI indication, reducing processing complexity despite having multiple patterns available.
Data Source
AI summary
A network node configured to communicate with a wireless device (WD) utilizing at least one of a first Radio Access Technology (RAT) and a second RAT is provided. The network node includes processing circuitry configured to determine a rate matching configuration from a plurality of rate matching configurations for communication with the WD and cause the network node to transmit an indication of the determined rate matching configuration to the WD and to use the determined rate matching configuration in at least another transmission towards the WD.