DMRS Resource Indication for Wireless Interference Management
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Solution Overview
Problem
In wireless communication systems, especially in dynamic TDD and flexible duplex scenarios, strong cross interference between uplink and downlink signals can lead to incorrect demodulation of DMRS, and existing methods fail to effectively indicate and manage DMRS resources, resulting in potential waste of resources or orthogonality issues between uplink and downlink DMRSs.
Innovation Solution
A resource indication method is developed to explicitly or implicitly notify terminal devices whether resources mapped to no DMRS can be used for other information transmission, using configuration information to determine the usage of resources, thereby optimizing DMRS resource utilization and ensuring orthogonality between uplink and downlink signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dynamic TDD or flexible duplex is used to adapt to different services and improve system throughput, then system throughput and service adaptability are improved, but cross interference between uplink and downlink signals increases, leading to incorrect demodulation of DMRS
Solution Approach 1:
The patent segments the frequency spectrum into separate uplink and downlink frequency ranges, and divides DMRS resources into different groups (first group for downlink, second group for uplink) that are mapped to different physical resource blocks. This segmentation prevents cross-interference between uplink and downlink DMRS by ensuring they occupy orthogonal frequency resources, thereby maintaining reliable demodulation while enabling dynamic TDD operation.
Solution Approach 2:
The patent introduces configuration information as an intermediary mechanism that explicitly indicates which resource groups are allocated to uplink and which to downlink. This intermediary signaling enables the system to dynamically adapt resource allocation to different service requirements while maintaining orthogonal separation between uplink and downlink DMRS, preventing interference and ensuring demodulation accuracy.
2Device complexity
If DMRS resources are allocated without explicit indication to terminal devices, then device complexity and signaling overhead are reduced, but resource utilization efficiency deteriorates due to potential waste or orthogonality issues
Solution Approach 1:
The patent applies preliminary action by pre-configuring and indicating to terminal devices which resource groups (first group or second group) are allocated to uplink and which to downlink before actual data transmission. This advance indication enables terminal devices to correctly identify and use orthogonal DMRS resources without increasing operational complexity during transmission, thereby improving resource utilization efficiency while maintaining manageable device complexity.
Data Source
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AI summary
This application discloses a resource indication method, a network device, and a terminal device, to improve utilization of a resource mapped to a DMRS port. The method includes: sending, by a network device, configuration information to a terminal device, so that the terminal device determines, based on the configuration information, that a second resource in first resources is used to transmit first information or that a third resource in first resources is not used to transmit first information, where the first resources are resources mapped to a DMRS port. In this way, the terminal device can multiplex the resources mapped to the DMRS port. When some of the first resources are not used to transmit a DMRS, the resources may be indicated to determine whether the resources may be used to transmit the first information, for example, the first information may be data, control information, or other information different from DMRS information, thereby ensuring maximum use of the resources mapped to the DMRS port, and improving resource utilization.