Mini-Slot DMRS Mapping to Avoid Control-Channel Interference
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Solution Overview
Problem
The existing 5G NR system lacks a DMRS configuration and transmission method for mini-slot scenarios, leading to interference between control and service channels and suboptimal demodulation performance.
Innovation Solution
A DMRS transmission method for network devices that configures and maps DMRS of service channels within mini-slots, offsetting them by M time-domain symbols relative to control channels to prevent interference and improve demodulation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DMRS is not configured for mini-slot scenarios, then existing NR system can maintain simplicity, but interference between control and service channels occurs and demodulation performance deteriorates
Solution Approach 1:
The patent segments the DMRS configuration into different types (first DMRS and second DMRS) with distinct mapping rules. First DMRS is mapped to time-domain transmission resources offset by M symbols relative to control channel, while second DMRS is mapped to other time-domain resources. This segmentation resolves the interference issue between control and service channels while maintaining manageable configuration complexity through clear differentiation of DMRS types and their respective mapping principles.
2Object-affected harmful factors
If DMRS is mapped to time-domain resources offset by M symbols relative to control channel, then interference between control and service channels is prevented, but time-domain resource utilization may be affected
Solution Approach 1:
The patent utilizes frequency-domain resources to complement the time-domain offset strategy. By mapping first DMRS to time-domain resources offset by M symbols and second DMRS to other time-domain resources, and further differentiating them through frequency-domain characteristics, the system achieves interference prevention while maintaining efficient resource utilization across both time and frequency dimensions.
3Adaptability or versatility
If fixed DMRS position is used in normal slot, then implementation is simple, but adaptability to mini-slot scenarios is reduced
Solution Approach 1:
The patent introduces dynamic DMRS position configuration where the time-domain position of DMRS is no longer fixed but can be adjusted based on the specific transmission scenario. The network device can configure first DMRS with time-domain offset M relative to control channel for mini-slot scenarios, while maintaining fixed position for normal slot scenarios. This dynamic adjustment capability enhances adaptability to different slot types without requiring complete redesign of the DMRS system.
Data Source
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AI summary
A DMRS transmission method, a network device and a UE are provided. The DMRS transmission method includes: configuring DMRS of a service channel within a mini-slot; mapping parts of or all of the DMRS of the service channel to a time-domain transmission resource, the time-domain transmission resource being offset by M time-domain symbols relative to a time-domain transmission resource corresponding to a control channel within the mini-slot, M being an integer greater than or equal to 1; and transmitting the DMRS of the service channel through the time-domain transmission resource.