DMRS Configuration for Non-Overlapping PDCCH Resources
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Solution Overview
Problem
Wireless communication systems face conflicts due to overlapping resources between different radio access technologies (RATs) like 5G and 4G, which restrict the ability to transmit demodulation reference signals (DMRS) in physical downlink control channel (PDCCH) resources when cell-specific reference signal (CRS) resources overlap, leading to inefficient resource utilization and communication reliability issues.
Innovation Solution
The implementation of specific DMRS configurations that allow DMRS transmission within PDCCH resources of a first RAT (e.g., 5G) without overlapping with CRS resources of a second RAT (e.g., 4G) by determining DMRS configurations based on both PDCCH and CRS configurations, enabling DMRS reception in non-overlapping portions of the PDCCH resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If DMRS transmission is attempted in PDCCH resources that overlap with CRS resources, then resource utilization would improve, but communication reliability deteriorates due to signal conflicts
Solution Approach 1:
The PDCCH resources are segmented into overlapping and non-overlapping portions relative to CRS resources. DMRS transmission is performed only in the non-overlapping portions, while the overlapping portions are excluded. This segmentation allows the system to utilize available resources without causing signal conflicts, thereby improving resource utilization while maintaining communication reliability.
Solution Approach 2:
Different transmission strategies are applied to different portions of PDCCH resources based on their overlap status with CRS resources. The non-overlapping portions are used for DMRS transmission with full quality, while the overlapping portions are excluded or handled differently. This local differentiation optimizes resource usage without compromising reliability in critical areas.
2Reliability
If DMRS configurations are restricted to avoid CRS overlap, then communication reliability is maintained, but resource utilization efficiency deteriorates
Solution Approach 1:
The DMRS configuration is made dynamic by determining the specific time-frequency resources for DMRS transmission based on the actual overlap between PDCCH and CRS resources. Rather than using a fixed conservative configuration, the system adaptively identifies and utilizes non-overlapping portions, thereby maintaining reliability while improving resource utilization efficiency according to actual conditions.
Solution Approach 2:
The DMRS resource allocation parameters are adjusted based on the overlap configuration between PDCCH and CRS. By changing the time-frequency resource parameters dynamically according to the overlap situation, the system achieves both reliable communication (by avoiding conflicts) and efficient resource utilization (by using available non-overlapping resources).
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) receives a physical downlink control channel (PDCCH) configuration associated with a first radio access technology (RAT), the PDCCH configuration for a first set of time-frequency resources including one or more control channel elements (CCEs). The UE receives a cell-specific reference signal (CRS) configuration associated with a second RAT, the CRS configuration for a second set of time-frequency resources that overlaps with at least one CCE. The UE receives a demodulation reference signal (DMRS) within a third set of time-frequency resources of a PDCCH in accordance with a DMRS configuration that is identified for the third set of time-frequency resources based on the PDCCH configuration and the CRS configuration, the third set of time-frequency resources included within the one or more CCEs of the first set of time-frequency resources exclusive of the second set of time-frequency resources.