DMRS Overlap Handling in 5G Receiving Devices
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Solution Overview
Problem
In 5G communications systems, the overlap of time-frequency resources for different services leads to high demodulation reference signal (DMRS) overheads and low resource utilization, as each service requires its own DMRS, even when resources are shared.
Innovation Solution
A method where a receiving device uses a first DMRS mapped to a target frequency domain resource of a first time-frequency resource to demodulate data on an overlapped target frequency domain resource of a second time-frequency resource, reducing the need for redundant DMRS transmissions by mapping the second data to the location originally used for the second DMRS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If each service transmits its own DMRS on overlapped time-frequency resources, then demodulation reliability is maintained, but DMRS overhead increases and resource utilization decreases
Solution Approach 1:
The patent merges the DMRS transmission for multiple services by allowing the first service to use the second service's DMRS for demodulation when time-frequency resources are overlapped. This combining approach eliminates redundant DMRS transmissions while maintaining demodulation capability for both services, directly reducing DMRS overhead without compromising reliability
Solution Approach 2:
The patent makes the second service's DMRS serve multiple functions: it demodulates both the second service's own data and the first service's data on overlapped resources. This multi-functionality allows a single DMRS to support multiple services, reducing the total number of DMRS required while maintaining demodulation reliability for all services
2Measurement precision
If each service transmits its own DMRS on overlapped time-frequency resources, then demodulation accuracy is ensured, but resource utilization decreases
Solution Approach 1:
The patent combines the demodulation function for multiple services into a single DMRS, allowing the first service to utilize the second service's DMRS. This merging reduces the number of reference signals transmitted, freeing up time-frequency resources for data transmission and improving overall resource utilization while maintaining demodulation accuracy
Solution Approach 2:
The patent discards the redundant second DMRS that would normally be transmitted for the second service on overlapped resources, since the first service's DMRS can serve both services. This discarding of unnecessary DMRS recovers the occupied time-frequency resources for productive data transmission, improving resource utilization without sacrificing demodulation accuracy
Data Source
AI summary
Embodiments of this application provide example data transmission methods. One example method includes: receiving, by a receiving device, first data on a first time-frequency resource, and receiving second data on a second time-frequency resource. When the first time-frequency resource and the second time-frequency resource have an overlapped target frequency domain resource in frequency domain, the receiving device can then use a first DMRS mapped to a target frequency domain resource of the first time-frequency resource to demodulate the second data mapped to a target frequency domain resource of the second time-frequency resource.