Alternative DMRS Configuration for PDCCH Repetition Detection
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately detecting the repetition number of a Physical Downlink Control Channel (PDCCH) message during random access procedures, particularly for user equipment (UE) that are unaware of multiple repetitions of the PDCCH communication.
Innovation Solution
The implementation of an alternative demodulation reference signal (DMRS) configuration for repetitions of a random access response PDCCH communication, which includes transmitting an indication of this alternative configuration to user equipment (UE). This configuration allows UE to correctly identify the number of repetitions and timing of the PDCCH communication, ensuring accurate detection of the random access response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple repetitions of PDCCH communication are transmitted for random access response, then the reliability of PDCCH detection is improved, but the complexity of detecting the repetition number increases for user equipment
Solution Approach 1:
The patent applies parameter changes by modifying the DMRS configuration parameters (such as scrambling code or sequence) based on the repetition number. This allows the UE to identify the repetition number through parameter detection rather than complex counting, thereby maintaining high reliability while reducing detection complexity. The DMRS configuration changes systematically with each repetition, providing a clear indicator for the UE.
Solution Approach 2:
The patent introduces the DMRS as an intermediary element that carries implicit information about the repetition number. Instead of directly signaling the repetition number through complex control mechanisms, the system uses the DMRS configuration as a mediator to encode repetition information, which the UE can decode to determine the repetition number efficiently.
2Measurement precision
If alternative DMRS configuration is used for repetitions, then the accuracy of random access response timing identification is improved, but the configuration complexity increases
Solution Approach 1:
The patent employs parameter changes by systematically varying DMRS configuration parameters (such as scrambling codes, sequence indices, or pattern identifiers) according to the repetition number. This creates a clear, detectable pattern that enables accurate timing identification while keeping the configuration manageable through standardized parameter mappings.
Solution Approach 2:
The patent segments the DMRS configuration into distinct patterns or sets corresponding to different repetition numbers. Each repetition uses a specific segment or pattern of DMRS configuration, allowing the UE to identify the repetition number by detecting which segment is present, thereby improving timing accuracy without requiring complex analysis of the entire signal.
3Reliability
If repetitions of PDCCH are transmitted to ensure reliable delivery, then the success rate of random access response is improved, but the time consumption increases
Solution Approach 1:
The patent implements feedback mechanisms where the UE detects the DMRS configuration to identify the repetition number and provides this information back to the network. This feedback allows the system to optimize subsequent transmissions, reducing unnecessary repetitions and minimizing time consumption while maintaining high success rates through initial reliable delivery.
Solution Approach 2:
The patent introduces dynamic adjustment capabilities where the transmission parameters, including DMRS configuration and repetition patterns, can be adapted based on detected conditions. This allows the system to dynamically optimize the number of repetitions and timing parameters, reducing overall time consumption while ensuring reliable delivery through adaptive rather than fixed repetition strategies.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive an indication of an alternative configuration associated with demodulation reference signals (DMRSs) for one or more repetitions of a physical downlink control channel (PDCCH) communication associated with a random access response message. The UE may receive at least one repetition of the PDCCH communication that includes a DMRS that uses the alternative configuration. Numerous other aspects are provided.