Physical Channel Scrambling for Multi-TRP Interference Randomization
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Solution Overview
Problem
In mobile communication systems, particularly in 5G New Radio (NR), the existing scrambling methods for Physical Downlink Shared Channels (PDSCHs) fail to randomize interference effectively when multiple TRPs or beams transmit data simultaneously due to the reliance on a single parameter value for scrambling, leading to uncontrolled interference.
Innovation Solution
A method and device for scrambling data that assigns unique scrambling information to each physical channel based on identifiers of search spaces, control resource sets, or groups associated with the channels, ensuring distinct initial values for scrambling sequences, thereby randomizing interference among multiple PDSCHs, PUSCHs, or PUCCHs transmitted from different TRPs or beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single scrambling parameter is used for all PDSCHs on one BWP, then device complexity is reduced, but interference randomization capability deteriorates
Solution Approach 1:
The patent divides the single scrambling parameter into multiple parameters, where each PDSCH is assigned a unique scrambling parameter based on its associated search space identifier. This segmentation allows different PDSCHs to use different scrambling sequences, achieving interference randomization while maintaining manageable system complexity through structured parameter assignment.
Solution Approach 2:
The patent applies local quality by assigning different scrambling parameters to different PDSCHs based on their specific search space identifiers. Each PDSCH receives a customized scrambling parameter tailored to its local characteristics (search space association), enabling differentiated interference randomization for each channel while maintaining overall system coherence.
2Reliability
If multiple scrambling parameters are assigned to different PDSCHs, then interference randomization is improved, but device complexity increases
Solution Approach 1:
The patent implements universality by using the search space identifier, which serves multiple functions: it identifies the search space for PDCCH, determines the scrambling parameter for PDSCH, and enables interference randomization. This multi-functionality reduces the need for separate parameter management mechanisms, thereby limiting the increase in device complexity while achieving improved interference randomization.
Solution Approach 2:
The patent employs feedback mechanisms where the network dynamically configures search space identifiers and scrambling parameters based on transmission conditions. This feedback loop allows the system to adapt scrambling parameters to current network states, improving interference randomization while managing complexity through dynamic rather than static parameter assignment.
Data Source
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AI summary
Provided in embodiments of the present invention are a data scrambling method and device and a communication apparatus. The data scrambling method comprises: a first apparatus determining scrambling information corresponding to multiple physical channels, wherein different physical channels correspond to different scrambling information; and the first apparatus performing descrambling of a received physical channel and/or scrambling of a physical channel to be transmitted on the basis of the scrambling information.