Single DCI Carrier Scheduling via Repetition Patterns
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently scheduling multiple carriers using single downlink control information (DCI) transmissions, leading to reduced reliability and increased latency due to the likelihood of unsuccessful DCI receptions.
Innovation Solution
The proposed solution involves signaling from a network entity to a user equipment (UE) that indicates a pattern for a single DCI providing scheduling information for multiple carriers. This pattern may include repetitions of the single DCI, with the quantity of repetitions and carriers based on the size of the DCI. The UE performs control channel receive quality measurements and provides feedback to the network entity, which adjusts parameters like transmit power and beamforming to enhance DCI reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single DCI transmission is used to provide scheduling information for multiple carriers, then the complexity of control signaling is reduced, but the reliability of DCI reception deteriorates due to increased likelihood of unsuccessful reception
Solution Approach 1:
The single DCI transmission is segmented into multiple repetitions transmitted across different carriers. Each repetition contains the same scheduling information, allowing the UE to successfully receive the DCI if at least one repetition is received correctly. This segmentation approach maintains the benefit of single DCI complexity reduction while improving reception reliability through multiple transmission opportunities.
Solution Approach 2:
The system transmits redundant copies of the DCI across multiple carriers before any potential reception failure occurs. This prior cushioning ensures that even if some carriers experience poor channel conditions or failures, the scheduling information is already cushioned against loss through multiple pre-transmitted repetitions, thereby maintaining reliability.
2Reliability
If the quantity of DCI repetitions is increased to improve reception reliability, then the reliability of DCI reception improves, but the latency increases due to additional transmission time
Solution Approach 1:
The DCI repetitions are transmitted periodically across different carriers in a coordinated manner. This periodic action allows the UE to monitor for DCI repetitions at regular intervals across multiple carriers, improving the probability of successful reception without requiring all repetitions to be transmitted sequentially, thereby reducing the overall latency compared to non-periodic transmission schemes.
3Reliability
If DCI is transmitted over multiple carriers to improve reception reliability, then the reliability of DCI reception improves, but the device complexity increases due to multiple monitoring requirements
Solution Approach 1:
The UE is configured to monitor multiple carriers for DCI repetitions using a unified monitoring approach. The same DCI format and scheduling information structure is used across all carriers, allowing the UE to apply the same decoding and processing logic regardless of which carrier carries the repetition. This universality reduces device complexity compared to handling different DCI formats on different carriers.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described that provide for signaling from a network entity to a user equipment (UE) that indicates a pattern for a single downlink control information (DCI) transmission that provides scheduling information for multiple carriers. The pattern may provide two or more repetitions of the single DCI, where a quantity of repetitions, an identity or quantity of carriers over which the DCI is transmitted, or combinations thereof, may be based on a size of the DCI. The UE also may perform control channel receive quality measurements and prediction on each carrier for different DCI sizes and provide feedback to the network entity on which carrier has highest likelihood of successful DCI reception for possible DCI size ranges, which the network entity may use to determine which carriers use for DCI, an aggregation level, a transmit power, beamforming parameters, or any combinations thereof.