Search Space Specific Delay for PDCCH Scheduling
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in configuring time delays between downlink control channels and corresponding data channels, particularly due to the restrictive practice of configuring delays per bandwidth part, which limits flexibility and increases communication delays at higher frequencies and larger subcarrier spacings.
Innovation Solution
Configuring time delays per search space instead of per bandwidth part, allowing for different delays to be set for each search space, thereby providing more flexibility in managing the timing of downlink and uplink data transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a longer time delay is configured between PDCCH reception and scheduled data transmission, then the UE has more time to decode and process the control channel, but the communication delay of downlink and uplink data increases
Solution Approach 1:
The patent segments the time delay configuration by introducing search space-specific delay parameters (e.g., k0, k2 values) for different search space sets. This allows the system to divide the single delay configuration into multiple granular configurations, enabling shorter delays for some search spaces and longer delays for others, thus resolving the contradiction between decoding reliability and communication efficiency
Solution Approach 2:
The patent implements dynamic time delay adjustment by allowing different k0 and k2 values to be configured for different search space sets based on their specific requirements. The base station can dynamically select appropriate delay values for each search space, adapting the timing configuration to varying channel conditions, UE capabilities, and traffic requirements, thereby optimizing both decoding reliability and communication delay
2Device complexity
If time delays are configured per bandwidth part, then the configuration is simplified, but flexibility is reduced and communication delays increase at higher frequencies and larger subcarrier spacings
Solution Approach 1:
The patent further segments the delay configuration from bandwidth part level to search space set level. Each search space set can have its own specific k0 and k2 values, allowing fine-grained control over timing relationships. This segmentation enables the system to maintain simplicity where needed while providing flexibility for specific search spaces with unique requirements, particularly at higher frequencies and larger subcarrier spacings
Solution Approach 2:
The patent applies local quality by allowing different time delay parameters to be configured for different search space sets within the same bandwidth part. This enables optimization of timing characteristics for specific search spaces (e.g., those used for critical control information or specific UE groups) without affecting other search spaces, providing localized adaptation to different operational requirements
Data Source
AI summary
Aspects relate to configuring a delay between a downlink control channel and a downlink/uplink. For example, the base station determines first search spaces indicating potential locations for a first downlink control channel and/or second search spaces indicating potential locations for a second downlink control channel. The base station configures and transmits first delays and/or second delays. Each first delay indicates a respective time delay between a resource location of the first downlink control channel and a resource location of a downlink data associated with the first downlink control channel and is configured for a respective first search space of the first search spaces. Each second delay indicates a respective time delay between a resource location of the second downlink control channel and a resource location of an uplink data associated with the second downlink control channel and is configured for a respective second search space of the second search spaces.