Group Common PDCCH Mapping in Wireless Search Space
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Solution Overview
Problem
Current wireless communication systems face challenges in accurately and efficiently transmitting and receiving downlink control information, particularly through a group common physical downlink control channel (PDCCH), which results in increased overhead and complexity during blind detection by user equipment (UE).
Innovation Solution
The method involves mapping the group common PDCCH into a common search space (CSS) and reserving a specific position among PDCCH candidates, thereby defining radio resources for transmission and reception, and reducing overhead by limiting the number of candidates for blind detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the group common PDCCH is mapped to multiple PDCCH candidates in the common search space, then the reliability of control information transmission is improved, but the blind detection overhead and complexity increase
Solution Approach 1:
The patent segments the common search space by designating specific PDCCH candidates (e.g., first and third candidates) for group common PDCCH transmission, while other candidates are used for other purposes. This segmentation allows the UE to know in advance which candidates to monitor for group common PDCCH, reducing blind detection complexity while maintaining transmission reliability through multiple candidate options.
2Measurement precision
If the number of PDCCH candidates for group common PDCCH is increased, then the accuracy of control information reception is improved, but the overhead during blind detection increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring and indicating to the UE which specific PDCCH candidates will carry group common PDCCH transmissions. This allows the UE to prepare in advance by monitoring only those predetermined candidates, thereby improving reception accuracy without incurring the overhead of blind detection across all possible candidates.
3Productivity
If the group common PDCCH is mapped to predetermined PDCCH candidates, then the resource allocation efficiency is improved, but the flexibility in resource distribution is reduced
Solution Approach 1:
The patent implements dynamics by allowing the network to flexibly configure and update which PDCCH candidates are designated for group common PDCCH through higher-layer signaling. This enables the system to adapt to different traffic conditions and UE capabilities while maintaining the efficiency benefits of predetermined candidate allocation, as the configuration can be changed when needed.
Data Source
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Figure 3(a)~3(c)
AI summary
A method for receiving downlink control information by a terminal in a wireless communication system according to an embodiment of the present invention may comprise the steps of: performing blind detection of a group-common physical downlink control channel (PDCCH) in a common search space (CSS) having a plurality of PDCCH candidates; and acquiring downlink control information (DCI) indicating a slot format from the group-common PDCCH acquired through the blind detection, wherein, in the blind detection of the group-common PDCCH, the terminal attempts to selectively detect the group-common PDCCH for only a PDCCH candidate at a predetermined position in the CSS having the plurality of PDCCH candidates.