Dummy PDCCH Sensing for Wireless Channel Configuration
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Solution Overview
Problem
Current wireless communication systems, particularly in new radio (NR) and LTE technologies, face challenges in efficiently performing channel sensing across multiple transmission configurations, which is essential for maintaining effective communication links, especially in dynamic environments like millimeter wave systems where channel sensing can be slow and resource-intensive.
Innovation Solution
The implementation of dummy physical downlink control channel (PDCCH) transmissions with different configurations, which trigger acknowledgement (ACK) feedback without carrying a grant, allows for efficient channel sensing. This involves using a dynamic hybrid automatic repeat request (HARQ) codebook and reserving bits in the UE codebook for providing feedback on multiple control resource sets associated with the same transmission configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional channel sensing methods are used across multiple transmission configurations, then channel sensing coverage is comprehensive, but resource overhead and latency increase significantly
Solution Approach 1:
The patent segments the channel sensing process by using separate dummy PDCCH transmissions for each transmission configuration (e.g., different TCI states). Each dummy PDCCH targets a specific configuration, allowing parallel independent sensing operations that reduce overall latency while maintaining comprehensive coverage across all configurations.
Solution Approach 2:
The patent performs preliminary channel sensing using dummy PDCCH transmissions before actual data transmission. By pre-sensing the channel quality for multiple transmission configurations in advance, the system determines the best configuration to use for subsequent data transmissions, thereby avoiding real-time sensing delays and reducing overall communication latency.
2Reliability
If traditional channel sensing methods are used across multiple transmission configurations, then all configurations are tested, but resource overhead increases
Solution Approach 1:
The patent makes the dummy PDCCH structure universal across all transmission configurations by using a standardized format that can be reused for each configuration. This universal dummy PDCCH design eliminates the need for separate sensing resources for each configuration, reducing overall resource overhead while maintaining complete testing coverage across all transmission configurations.
Solution Approach 2:
The patent creates simplified copies of the PDCCH structure specifically for sensing purposes. These dummy PDCCH copies contain only the essential fields needed for channel sensing (such as TCI state indicators) without the full overhead of regular data-scheduling PDCCH messages, thereby reducing resource consumption while maintaining sensing effectiveness.
3Measurement precision
If multiple dummy PDCCH transmissions are sent for different configurations, then channel sensing accuracy improves, but feedback complexity increases
Solution Approach 1:
The patent merges the feedback for multiple dummy PDCCH transmissions into a single HARQ feedback message. By combining the acknowledgment information for all dummy PDCCHs (sent across different transmission configurations) into one unified feedback transmission, the system maintains high channel sensing accuracy while significantly reducing feedback complexity and overhead compared to separate feedback messages for each configuration.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for per transmission configuration channel sensing. A method for wireless communication by a user equipment (UE) generally includes monitoring a plurality of dummy physical downlink control channel (PDCCH) transmissions from at least one base station (BS). The dummy PDCCH transmissions use a different transmission configuration. The UE sends acknowledgment feedback for the plurality of dummy PDCCH transmission. The ACK feedback for the dummy PDCCH transmissions may be multiplexed with ACK feedback to the at least one BS for physical downlink shared channel (PDSCH) transmissions. A UE may receive a configuration reserving one or more bits in a UE codebook for providing the ACK feedback. Each reserved bit may be for control resource sets associated with a transmission configuration. The UE monitors PDDCH transmissions using different transmission configurations and uses the reserved bits to transmit ACK feedback for the PDCCH transmissions.