Group-common PDCCH Monitoring via Payload Size Signaling
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately and efficiently transmitting and receiving group-common Physical Downlink Control Channels (PDCCH) due to complexities in monitoring and decoding, particularly in multi-carrier and millimeter wave frequency bands.
Innovation Solution
A method and apparatus for user equipment (UE) to receive downlink signals by monitoring group-common PDCCH through higher layer signaling, determining slot format indications, and adjusting transmission based on payload size and control channel element aggregation levels, while ignoring or delaying PUSCH transmission when slot format changes, to ensure accurate and efficient communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors group-common PDCCH without specific payload size and aggregation level information, then the UE can potentially detect all possible PDCCH formats, but the UE complexity and processing burden increase significantly
Solution Approach 1:
The base station performs preliminary action by determining and signaling the payload size and aggregation level of group-common PDCCH to the UE through higher layer signaling before the UE begins monitoring. This pre-provisioning of parameters allows the UE to configure its monitoring behavior in advance, avoiding the need to attempt detection of all possible PDCCH formats and thereby reducing processing burden while maintaining detection reliability.
2Measurement precision
If the UE monitors all possible PDCCH formats in control resource set, then the UE may detect the correct PDCCH, but the time and processing resources required increase
Solution Approach 1:
The base station provides payload size and aggregation level information through higher layer signaling before the UE performs monitoring. This preliminary provision of parameters enables the UE to narrow down the search space to only the relevant PDCCH formats, thereby maintaining detection accuracy while significantly reducing the time and processing resources required for monitoring.
3Speed
If the UE applies slot format indication immediately upon reception, then the slot format changes quickly, but this may conflict with ongoing transmissions and cause errors
Solution Approach 1:
The patent introduces a timing offset parameter that creates a buffer period between the reception of slot format indication and its actual application. This beforehand cushioning allows ongoing transmissions to complete or be properly managed before the slot format changes take effect, preventing conflicts and transmission errors while still enabling relatively quick format switching through configurable offsets.
4Adaptability or versatility
If the UE monitors group-common PDCCH without configured parameters, then the system remains flexible, but the monitoring and decoding processes become inefficient
Solution Approach 1:
The base station performs preliminary configuration by providing payload size and aggregation level information through higher layer signaling. This pre-configuration enables the UE to efficiently monitor and decode group-common PDCCH by focusing on specific formats rather than attempting to process all possible formats, thereby improving monitoring efficiency while the system retains flexibility through configurable parameters that can be adjusted based on traffic conditions.
Data Source
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AI summary
A method by which a terminal receives a downlink signal in a wireless communication system, according to one embodiment of the present invention, comprises the steps of: receiving information on a payload size of a group common-physical control channel (GC-PDCCH), which should be monitored by the terminal, and information on a control channel element (CCE) aggregation level of the GC-PDCCH, which should be monitored by the terminal; monitoring the GC-PDCCH in a control resource set (CORESET) on the basis of the information on the payload size of the GC-PDCCH and the information on the CCE aggregation level of the GC-PDCCH; and obtaining a slot format indication (SFI) through the GC-PDCCH.