UE Control Channel Monitoring with Precoding Granularity
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Solution Overview
Problem
In wireless communication systems, user equipment (UE) face inefficiencies in monitoring control channel candidates due to overlaps with other resource sets, leading to degraded channel estimation performance and resource wastage.
Innovation Solution
The UE receives configuration information on precoder granularity to determine which resource blocks within a control resource set have overlapping regions with other sets, such as those configured by the physical broadcasting channel (PBCH), and adjusts its monitoring and rate matching accordingly, skipping or puncturing overlapping regions to optimize resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE monitors control channel candidates in all resource blocks of the control resource set, then the monitoring coverage is complete, but resource wastage occurs due to overlaps with other resource sets
Solution Approach 1:
The control resource set is segmented into overlapping and non-overlapping regions based on identification information. The UE separately processes these regions, monitoring control channel candidates only in non-overlapping regions to avoid resource wastage while maintaining reliable monitoring coverage where needed.
Solution Approach 2:
Different monitoring strategies are applied to different regions within the control resource set. Non-overlapping regions receive full monitoring attention for reliability, while overlapping regions are excluded or handled differently to reduce resource wastage, achieving local optimization of resource usage.
2Device complexity
If the UE assumes reference signals are mapped to all REGs in contiguous resource blocks, then channel estimation is simplified, but estimation accuracy degrades due to overlaps with PBCH resource sets
Solution Approach 1:
The resource blocks are segmented into overlapping and non-overlapping regions. Reference signal mapping assumptions are applied differently to each segment: in non-overlapping regions, the simplified assumption holds; in overlapping regions, the UE accounts for potential reference signal absence or different mapping, improving estimation accuracy without excessive complexity.
Solution Approach 2:
The UE applies the simplified reference signal mapping assumption partially - only to non-overlapping regions where it is valid. In overlapping regions, the UE takes additional actions to verify or adjust assumptions, achieving accurate channel estimation where it matters most without unnecessarily complicating the overall process.
3Reliability
If the UE monitors control channel candidates in overlapping regions, then no control information is missed, but processing overhead increases
Solution Approach 1:
The monitoring process is segmented into two phases: first, the UE identifies overlapping regions using identification information; second, the UE monitors control channel candidates only in non-overlapping regions. This segmentation eliminates unnecessary processing in overlapping regions, reducing time loss while maintaining reliability through targeted monitoring.
Solution Approach 2:
The UE performs preliminary identification of overlapping regions before monitoring control channel candidates. By pre-processing to determine which regions require monitoring and which can be skipped, the UE avoids unnecessary processing overhead while ensuring no critical control information is missed in the monitored regions.
Data Source
AI summary
The method for reception of a signal by a terminal in a wireless communication system according to an embodiment of the present invention may comprise a step of monitoring control channel candidates on the basis of information on precoding granularity. Specifically, even if information on the precoding granularity instructs to the terminal to assume that the reference signal with respect to the control channel candidates is mapped to all resource element groups (REGs) included in consecutive resource blocks in the first control resource set, when some of the consecutive resource blocks overlap with a second control resource set set by a physical broadcasting channel (PBCH), the terminal may not assume that the reference signal with respect to the control channel candidates is mapped to the REGs included in some resource blocks which are overlapping.