Downlink Control Information Blind Decoding Search Space Segmentation
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Solution Overview
Problem
Current wireless communication systems, such as LTE, face challenges in efficiently transmitting and receiving control information, particularly in managing uplink retransmissions across multiple user equipment (UEs), which affects network performance and resource allocation.
Innovation Solution
A method and apparatus for receiving downlink control information (DCI) in a wireless communication system, where DCI is monitored and detected by borrowing blind decoding resources from a UE-specific search space, allowing for simultaneous indication of uplink transmission or retransmission across multiple UEs, with the option to configure specific radio resource regions and aggregation levels for efficient communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blind decoding resources are allocated in UE-specific search space for control information reception, then each UE can reliably detect its control information, but the complexity of blind decoding process increases and resource allocation efficiency decreases
Solution Approach 1:
The patent segments the blind decoding process by separating common search space (CSS) and UE-specific search space (USS). Control information for multiple UEs is transmitted in CSS, while UE-specific control information uses USS. This segmentation allows UEs to perform blind decoding only in their assigned spaces, reducing overall complexity while maintaining detection reliability.
Solution Approach 2:
The patent applies partial action by having UEs perform blind decoding only in specific search spaces rather than monitoring all possible control information locations. Each UE is configured to monitor only relevant CSS or USS regions, reducing the number of blind decoding attempts required while ensuring reliable detection of necessary control information.
2Productivity
If control information is transmitted to multiple UEs simultaneously, then resource allocation efficiency improves, but the difficulty of detecting and measuring control information increases
Solution Approach 1:
The patent uses a universal common search space (CSS) that can serve multiple UEs simultaneously. Control information in CSS is designed to be detectable by multiple UEs using the same detection procedures, enabling efficient group-based resource allocation while maintaining standardized detection processes that do not increase individual UE complexity.
Solution Approach 2:
The patent applies local quality by providing UE-specific search spaces with customized configurations for individual UEs or UE groups. Each UE can have tailored search space parameters (such as monitoring occasions, aggregation levels) optimized for its specific requirements, making detection easier while allowing efficient resource allocation across different UE types and service requirements.
3Adaptability or versatility
If radio resource regions are configured for control information transmission, then resource allocation flexibility improves, but the device complexity for managing multiple search spaces increases
Solution Approach 1:
The patent implements dynamic search space configuration where UE-specific search spaces can be activated or deactivated based on service requirements and channel conditions. The network can dynamically adjust the number, location, and monitoring parameters of search spaces, providing flexibility while using standardized procedures to manage complexity at the UE side.
Solution Approach 2:
The patent uses preliminary configuration of search space parameters through higher-layer signaling (RRC configuration) before actual control information transmission. This preliminary setup establishes the search space structure, monitoring occasions, and aggregation levels in advance, allowing flexible resource allocation while reducing real-time processing complexity at the UE by having parameters pre-configured.
Data Source
AI summary
The present invention relates to a method for a terminal to receive downlink control information in a wireless communications system and an apparatus therefor. More specifically, the method is characterized by comprising a step for receiving downlink control information (DCI) indicating whether to retransmit an uplink or not, wherein DCI is defined to simultaneously transmit whether to retransmit the uplink for each of the plurality of terminals.