PDCCH Resource Overlap for More Control-Channel Transmissions
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Solution Overview
Problem
In communication systems, the overlap of rate matching resources with PDCCH candidate resources leads to reduced PDCCH transmission and inefficient resource usage due to the existing protocol restricting DM-RS and PDCCH from overlapping, causing terminal devices to fail in detecting PDCCH candidates.
Innovation Solution
The method allows for the configuration of time-frequency resources where DM-RS and PDCCH can overlap, enabling the terminal to receive downlink data channels and DM-RS on non-overlapping resources, and dynamically classifying or indicating whether to monitor PDCCH candidates based on network configuration, thereby optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If rate matching resource cannot overlap DM-RS resource, then channel estimation complexity is reduced, but PDCCH transmission quantity is limited
Solution Approach 1:
The patent segments the time-frequency resource into two distinct parts: a first time-frequency resource for PDCCH transmission and a second time-frequency resource for PDSCH and DM-RS transmission. This segmentation allows the PDCCH to be transmitted on resources that would otherwise be unavailable, increasing PDCCH transmission quantity while maintaining separate estimation references to control complexity.
Solution Approach 2:
The patent introduces a new dimension of resource allocation by allowing PDCCH to use rate matching resources in the time-frequency domain that were previously restricted. By changing the dimensional understanding of resource overlap from strict spatial exclusion to structured temporal-m-frequency separation, more PDCCH candidates can be transmitted without overwhelming channel estimation complexity.
2Productivity
If PDCCH candidate resource overlaps rate matching resource, then resource usage is improved, but terminal cannot detect PDCCH candidate
Solution Approach 1:
The patent applies local quality by differentiating the properties of different time-frequency resources. The first time-frequency resource is configured with specific characteristics suitable for PDCCH transmission, while the second time-frequency resource is configured for PDSCH and DM-RS. This local differentiation allows overlapping in the broader resource space while maintaining distinct local properties for reliable detection.
3Productivity
If more PDCCHs are transmitted on rate matching resources, then resource usage is improved, but channel estimation complexity increases
Solution Approach 1:
The patent introduces the first time-frequency resource as an intermediary carrier for PDCCH transmission. This intermediary resource layer allows PDCCH to be transmitted on rate matching resources without directly interfering with the DM-RS estimation process. The intermediary structure enables multiple PDCCH candidates to be transmitted while maintaining estimation complexity within acceptable limits through structured separation.
Data Source
AI summary
A communication method and apparatus are provided. The communication method includes: A terminal receives, from a network device, configuration information indicating a first time-frequency resource and downlink control information indicating a second time-frequency resource. The first time-frequency resource cannot be used to transmit a downlink data channel and a demodulation reference signal for the downlink data channel, and the second time-frequency resource includes a resource used to transmit the downlink data channel and the demodulation reference signal for the downlink data channel. When determining that a time domain resource of the first time-frequency resource includes a time domain resource of the second time-frequency resource, the terminal receives the downlink data channel and the demodulation reference signal for the downlink data channel on a third time-frequency resource.