Linked PDCCH Search Spaces for Reliable Repeated DCI Reception
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Solution Overview
Problem
Existing mobile communication systems face challenges in effectively configuring search space sets and PDCCH candidates for repeatedly transmitted control information, particularly in high-frequency bands, which affects service provision and terminal capability considerations.
Innovation Solution
A method is provided to configure search space sets and PDCCH candidates for monitoring repeatedly transmitted control information, taking into account terminal capabilities, enabling efficient resource allocation and service provision in mobile communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downlink control information is transmitted repeatedly to enhance coverage, then reliability is improved, but blind detection complexity and false alarms increase
Solution Approach 1:
The patent segments the downlink control information transmission into multiple repetitions with distinct scrambling identities. Each repetition can be independently detected and identified by the UE through blind detection, allowing the system to maintain reliability while reducing overall detection complexity by distributing the detection burden across multiple simpler, independent checks rather than one complex verification of the entire repeated sequence.
2Reliability
If downlink control information is transmitted repeatedly to enhance coverage, then reliability is improved, but false alarm probability increases
Solution Approach 1:
The patent implements a feedback mechanism where the UE performs blind detection on each repeated transmission and provides feedback information to the base station. This feedback loop allows the system to identify and correct false alarms by comparing detection results across multiple repetitions and verifying through the feedback channel, thereby maintaining high reliability while reducing false alarm probability through iterative validation.
3Length of moving object
If blind detection is performed on repeated transmissions, then coverage is enhanced, but processing overhead increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the UE with scrambling identities and detection parameters before the actual repeated transmissions begin. The UE prepares detection templates and criteria in advance, allowing it to quickly process each repeated transmission without performing full-blind detection from scratch each time. This preliminary preparation significantly reduces processing overhead while maintaining enhanced coverage through repeated transmissions.
Data Source
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AI summary
A method performed by a terminal in a wireless communication system is provided. The method includes receiving configuration information for configuring one or more search space sets; identifying a connection between one or more PDCCH candidates of a first search space set and one or more PDCCH candidates of a second search space set, based on the configuration information; and monitoring the one or more PDCCH candidates of the first search space set and the one or more PDCCH candidates of the second search space set to receive repeated PDCCHs, wherein the one or more PDCCH candidates of the first search space set and the one or more PDCCH candidates of the second search space set are linked based on having a same aggregation level and a same PDCCH candidate index.