Multi-TRP Scrambling Sequence Initialization for Interference Rejection
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Solution Overview
Problem
In wireless communication systems with multiple transmit receive points (TRPs), the use of the same scrambling sequence by different TRPs due to shared cell identifiers, frequency, and codeword indices leads to interference rejection degradation, affecting the performance of the wireless communication link between the UE and one of the TRPs.
Innovation Solution
The UE and TRP generate a downlink scrambling sequence initialization code based on information unique to the TRP, enabling the generation of a downlink scrambling sequence that is unique to each TRP, allowing effective interference rejection and improved communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same scrambling sequence is used by multiple TRPs for simplicity and resource efficiency, then device complexity is reduced, but interference rejection capability deteriorates
Solution Approach 1:
The patent applies local quality by making the scrambling sequence specific to each TRP's local characteristics (TRP ID, cell ID, frequency allocation). Instead of using a universal scrambling sequence across all TRPs, each TRP generates its own unique scrambling sequence based on its local identifiers, thereby improving interference rejection while maintaining systematic generation processes
Solution Approach 2:
The patent changes the parameters used in scrambling sequence generation from generic parameters to TRP-specific parameters. The initialization code is modified to include TRP-specific identifiers (nID_TRP, cell ID, frequency allocation), transforming the scrambling sequence from a shared resource to a differentiated parameter that improves interference rejection capability
2Reliability
If TRP-specific information is included in the scrambling sequence initialization code, then interference rejection capability is improved, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-defining the structure of the scrambling sequence initialization code to include specific fields for TRP-specific information (nRNTI, nID_TRP, cell ID, frequency allocation). This preliminary structuring allows TRPs to generate unique scrambling sequences without complex real-time processing, as the parameter structure is established in advance
Solution Approach 2:
The patent segments the scrambling sequence initialization code into distinct fields with specific purposes (user identification, TRP identification, cell identification, frequency allocation). This segmentation organizes the complexity into manageable, standardized components that can be systematically processed
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive, from a first transmit receive point (TRP), a downlink control information (DCI) communication, the UE being included in a multi-TRP configuration with the first TRP and a second TRP. The UE may determine information unique to the first TRP. The information unique to the first TRP may be at least one of associated with the DCI communication or included in the DCI communication. The UE may generate a downlink scrambling sequence initialization code, associated with the first TRP, based at least in part on the information unique to the first TRP. The UE may generate a downlink scrambling sequence, associated with the first TRP, based at least in part on the downlink scrambling sequence initialization code associated with the first TRP. Numerous other aspects are provided.