DCI Blind Detection Using Receiver-ID Frozen Bit Scrambling
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Solution Overview
Problem
Blind decoding in wireless communications is time-consuming and resource-intensive due to the need for receivers to search multiple candidate locations for downlink control information (DCI) messages, especially in scenarios with intercell interference.
Innovation Solution
The use of scrambling sequences derived from UE and CELL IDs to modulate frozen and information bits in polar codes, enabling early termination of the decoding process and mitigating intercell interference by applying separate masks to different bit fields within the DCI message.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blind decoding is performed on all candidate locations to ensure reliable message reception, then message reception reliability is improved, but decoding time and computational resources increase significantly
Solution Approach 1:
The patent applies preliminary action by embedding receiver identification information into frozen bits before the main decoding process. This allows the receiver to perform preliminary checks on candidate locations and terminate decoding early for non-matching messages, avoiding the need to fully decode all candidates while maintaining reliable reception of intended messages
Solution Approach 2:
The patent extracts the receiver identification information from the full message structure and places it specifically in the frozen bits portion. This extraction enables independent verification of message intent before committing full decoding resources, separating the identification function from the main payload decoding
2Reliability
If blind decoding is performed on all candidate locations to ensure no message is missed, then message detection completeness is improved, but computational resources and energy consumption increase
Solution Approach 1:
The patent performs preliminary verification by checking the frozen bits containing receiver ID information before initiating full message decoding. This preliminary action filters out non-matching candidate locations early, ensuring no intended messages are missed while avoiding energy waste on messages not meant for the receiver
Solution Approach 2:
The patent applies partial action by performing only the necessary frozen bit verification rather than complete message decoding for all candidates. This partial verification is sufficient to identify intended messages and eliminate non-matching ones, reducing energy consumption while maintaining detection completeness
3Object-affected harmful factors
If separate scrambling masks are applied to different bit fields to mitigate intercell interference, then interference resistance is improved, but decoding complexity increases
Solution Approach 1:
The patent segments the DCI message into distinct bit fields (frozen bits and information bits) and applies separate scrambling masks to each segment. The first scrambling mask is derived from receiver ID for frozen bits, while the second mask is derived from cell ID for information bits. This segmentation enables targeted interference mitigation without requiring complete reprocessing of the entire message
Solution Approach 2:
The patent applies local quality by using different scrambling characteristics for different portions of the message. The frozen bits use receiver-specific scrambling to enable early identification, while information bits use cell-specific scrambling for interference mitigation. Each segment has optimized scrambling properties suited to its specific function, reducing overall decoding complexity through specialized local processing
Data Source
AI summary
Methods and devices are described for encoding and decoding control information that has been modulated based on one or more identifiers of the transmitter and/or receiver. Some embodiments describe scrambling sequence design for multi-mode block discrimination on downlink control information (DCI) blind detection. Separate scrambling masks may be applied to disparate bit fields within a coded DCI message, wherein each of the scrambling masks is derived from a unique identifier associated with either the transmitter or the intended receiver. The scrambling masks may be used by the receiver to perform early termination of the decoding process, to mitigate intercell interference, and to verify that the receiver is the intended receiver.