Discontinuous CORESET Allocation for NR PDCCH Symbol Collisions
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Solution Overview
Problem
In scenarios where New Radio (NR) and LTE coexist, collisions between NR and LTE time-domain symbols reduce the reliability of Physical Downlink Control Channel (PDCCH) transmission due to the requirement for continuous control resource sets, leading to insufficient time-domain resources for PDCCH carrying.
Innovation Solution
Determine discontinuous time-domain symbols using a discontinuous CORESET signaling parameter to allocate NR with non-continuous time-domain resources for PDCCH transmission, avoiding collisions with LTE symbols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous control resource sets are used for PDCCH transmission in NR, then the transmission reliability can be improved, but time-domain resource collisions with LTE CRS occur, reducing the available resources
Solution Approach 1:
The patent divides the control resource set into multiple segments or candidates, allowing the terminal to monitor multiple PDCCH candidates across different time-domain positions. This segmentation enables the system to distribute PDCCH transmissions across non-contiguous time resources, avoiding collisions with LTE CRS while maintaining reliability through diversity.
Solution Approach 2:
The patent introduces dynamic selection mechanisms where the terminal can adaptively choose which PDCCH candidate to monitor based on current channel conditions and collision patterns with LTE. This dynamic approach allows the system to optimize resource utilization in real-time, selecting time-domain positions that avoid LTE CRS collisions while maintaining reliable control channel transmission.
2Reliability
If more time-domain symbols are allocated to PDCCH to improve coverage, then transmission reliability increases, but resource collisions with LTE CRS increase, reducing effective resources
Solution Approach 1:
The patent transitions from considering only time-domain resource allocation to a multi-dimensional resource allocation approach that incorporates frequency-domain and code-domain dimensions. By distributing PDCCH candidates across multiple dimensions (different resource blocks, different code resources), the system can achieve improved coverage and reliability without concentrating all resources in time, thereby reducing collisions with LTE CRS in the time domain.
Solution Approach 2:
The patent changes the parameters of PDCCH transmission by introducing multiple candidates with different time-domain positions, frequency-domain allocations, and code resources. This parameter diversification allows the system to achieve better coverage through redundancy while avoiding systematic collisions with LTE CRS by varying the allocation parameters across different candidates.
3Reliability
If frequency-domain resources are maximized for PDCCH, then transmission reliability improves, but time-domain resources become insufficient for additional coverage enhancement
Solution Approach 1:
The patent creates a multi-functional PDCCH resource allocation mechanism where the same time-domain resources can serve multiple purposes through different candidates. By defining multiple PDCCH candidates that can be monitored in the same or different time slots, the system achieves universal resource utilization where frequency-domain resources are fully exploited while time-domain resources are efficiently shared across multiple candidates, preventing waste and enabling coverage enhancement.
Data Source
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AI summary
A method and device for determining a time-domain resource, and a medium are disclosed. The method for determining a time-domain resource includes: obtaining a discontinuous control resource set (CORESET) signaling parameter in New Radio (NR); and determining discontinuous time-domain symbols according to the discontinuous CORESET signaling parameter and transmitting the discontinuous time-domain symbols to a terminal, where the discontinuous time-domain symbols are used as time-domain resources for carrying a physical downlink control channel (PDCCH).