Dynamic DMRS Positioning for NR Uplink Downlink Interference
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Solution Overview
Problem
Current technologies lack an effective solution for setting the position of demodulation reference signals (DMRS) in slots, particularly in New Radio (NR) physical layer design, which affects flexibility and efficiency in data demodulation and acknowledgement feedback.
Innovation Solution
The method involves transmitting and receiving DMRS signals in overlapping positions within slots, with different transmission and reception directions, to facilitate fast demodulation and interference detection between uplink and downlink signals, using a communication node that acquires and transmits the multiplexing manner of signals via specified signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the demodulation reference signal is placed at a front position in the slot for fast demodulation, then the demodulation speed is improved, but the flexibility and adaptability for different application scenarios deteriorates
Solution Approach 1:
The patent makes the DMRS position dynamic and configurable rather than fixed. Different DMRS position configurations can be selected based on different application scenarios (e.g., front-loaded for fast demodulation, other positions for different requirements), allowing the system to adapt flexibly to various delay requirements and service types while maintaining optimal demodulation performance for each scenario
Solution Approach 2:
The patent changes the parameter of DMRS position from a fixed value to a configurable parameter. By allowing the DMRS position to be adjusted according to different scenarios (such as changing the symbol index or time domain location), the system can optimize between fast demodulation speed and adaptability to different application requirements
2Productivity
If the candidate positions of DMRS overlap between uplink and downlink slots, then the resource utilization is improved, but the interference between uplink and downlink signals worsens
Solution Approach 1:
The patent converts the potential harm of overlapping DMRS positions into a benefit by using the overlap as an opportunity for interference detection. When uplink and downlink DMRS occupy the same time-frequency resources, the system can detect the interference level and adjust accordingly, transforming what would normally be a harmful interference scenario into a useful mechanism for monitoring and managing resource conflicts
Solution Approach 2:
The patent introduces feedback mechanisms to monitor and manage the interference caused by overlapping DMRS positions. By detecting the interference level when uplink and downlink DMRS overlap and using this information to adjust transmission parameters or resource allocation, the system can maintain high resource utilization while controlling interference through continuous feedback and adaptation
Data Source
AI summary
Provided are information transmission and data demodulation methods and apparatuses, a communication node, and a network side device. The information transmission method includes: transmitting, by a first communication node, a first demodulation reference signal within a first slot, where candidate positions of the first demodulation reference signal within the first slot at least overlap with candidate positions of a second demodulation reference signal within a second slot, the second slot is a slot within which a second communication node transmits the second demodulation reference signal, and a transmission direction of the first demodulation reference signal within the first slot is different from a transmission direction of the second demodulation reference signal within the second slot.