Control Channel Repetition Configuration for Missed DCI Scheduling
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Solution Overview
Problem
Existing wireless communication systems face challenges in effectively handling downlink control signals, particularly in scenarios where repetitions of downlink control information (DCI) are required but may not be successfully received, leading to difficulties in determining scheduling offsets and time slots for radio resources.
Innovation Solution
A base station configures a wireless device with parameters for control channel repetition, indicating the presence of fields in DCI and specifying coresets for repetitions, allowing the device to determine scheduling offsets and time slots even if the latest repetition is not successfully received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control channel repetition is implemented to improve reliability, then the reliability of downlink control signal reception is improved, but the device complexity increases due to multiple search spaces and coresets configuration
Solution Approach 1:
The base station pre-configures the wireless device with multiple search spaces and associated coresets before control channel repetition is needed. This preliminary configuration includes defining search space sets with specific monitoring occasions, aggregation levels, and coreset parameters. When repetition is required, the device can immediately utilize these pre-established configurations without real-time computation, thereby improving reception reliability while minimizing processing complexity.
2Reliability
If multiple repeated control signals are sent to ensure successful reception, then the reliability is improved, but the loss of time increases due to potential failed receptions and retransmissions
Solution Approach 1:
The base station provides advance configuration of multiple search spaces with defined monitoring occasions and associations with scheduled radio resources. This allows the wireless device to pre-determine scheduling offsets and time slots based on the configured search space structure. Even if some repetitions are missed, the device can quickly identify the latest successfully received repetition using the pre-established configuration, thereby maintaining reliability while minimizing time loss.
Solution Approach 2:
The system implements a feedback mechanism where the wireless device monitors multiple search spaces and provides feedback on successful DCI reception. The base station uses this feedback to adjust transmission strategies. The configured search spaces include information about scheduling offsets and time slots, allowing the device to determine resource allocation based on the latest successful repetition without requiring additional round-trip communication, thus reducing time loss.
3Measurement precision
If configuration parameters are provided for each coreset to indicate field presence, then the precision of control signal interpretation is improved, but the quantity of information increases
Solution Approach 1:
The base station provides configuration parameters with local quality by specifying different levels of detail for different coresets based on their specific requirements. Each coreset configuration includes only the necessary fields for that particular search space, such as aggregation level, monitoring occasion periodicity, and association with scheduled resources. This selective configuration approach ensures precise DCI interpretation for each coreset while minimizing the overall quantity of configuration information by avoiding redundant parameters across all coresets.
Data Source
AI summary
Control channel repetition may be used in wireless communications. A base station may send repeated downlink control information (DCI) or physical downlink control channel (PDCCH) to a wireless device. The base station may send configuration parameters to the wireless device to indicate one or more first physical downlink control channel (PDCCH) candidates. Wireless resources may be determined by the wireless device based on a candidate of the last configured repetition. The base station may send one or more transport blocks to the wireless device.