NR Downlink Resource Allocation for DMRS-Aware PDSCH Scheduling
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Solution Overview
Problem
In the NR system, resources that cannot be used for PDSCH transmission result in wasted RBs, affecting channel estimation and reception performance due to DMRS overlap restrictions, leading to inefficient resource utilization.
Innovation Solution
A method and apparatus that determine a first resource incapable of transmitting a downlink data channel and DMRS, a second resource for transmission, and a third resource for actual transmission, allowing scheduling of multiple RBs without affecting reception performance by optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the entire RBG is scheduled to transmit PDSCH, then resource utilization is improved, but channel estimation and noise estimation are affected due to DMRS overlap with unavailable resources
Solution Approach 1:
The RBG is segmented into available resources and unavailable resources. The terminal device is configured with unavailable resource information (first information) that identifies specific RBs within the RBG that cannot transmit PDSCH. This segmentation allows the scheduler to allocate the entire RBG while the terminal device excludes unavailable resources from channel estimation, resolving the contradiction between resource utilization and reception performance.
Solution Approach 2:
The terminal device receives configuration information about unavailable resources before PDSCH transmission occurs. This preliminary configuration enables the terminal device to pre-calculate which resources to exclude from channel estimation and noise estimation, avoiding the harmful overlap effect while maintaining efficient resource utilization.
2Reliability
If only available RBs are scheduled, then reception performance is maintained, but resource utilization deteriorates due to wasted RBs in the RBG
Solution Approach 1:
Instead of scheduling only available RBs, the system segments the RBG and schedules the entire group while marking unavailable resources. The terminal device uses the first information to identify and exclude only the specific unavailable RBs from processing, allowing the scheduler to utilize the entire RBG structure while maintaining reception performance on available resources.
Solution Approach 2:
The system changes the parameter of resource allocation from individual RB-level scheduling to RBG-level scheduling with unavailable resource markers. This parameter change allows the scheduler to allocate larger resource blocks efficiently while the terminal device adjusts its processing parameters to exclude unavailable resources, achieving both high resource utilization and maintained reception performance.
3Device complexity
If DMRS overlaps with unavailable resources, then resource allocation is simplified, but channel estimation and noise estimation are adversely affected
Solution Approach 1:
The terminal device receives configuration information about unavailable resources in advance, before DMRS transmission occurs. This preliminary information allows the terminal device to pre-identify which DMRS resources to exclude from channel estimation and noise estimation, preventing the harmful overlap effect while maintaining simple resource allocation procedures.
Solution Approach 2:
The system extracts and removes the harmful overlap between DMRS and unavailable resources by configuring the terminal device with specific unavailable resource information. The terminal device excludes these extracted harmful resources from channel estimation and noise estimation processes, eliminating the adverse effect while maintaining simple resource allocation.
Data Source
AI summary
The present disclosure relates to communication methods. In one example method, a terminal device determines a first resource based on configuration information from a network device, where the first resource is a resource that cannot be used to transmit a downlink data channel and a demodulation reference signal of the downlink data channel. The terminal device determines a second resource based on downlink control information from the network device, where the second resource includes a resource used to transmit the downlink data channel and the demodulation reference signal of the downlink data channel. The terminal device determines a third resource based on the first resource and the second resource, where the third resource is a resource that is in the second resource and that is used to transmit the downlink data channel and the demodulation reference signal of the downlink data channel.