DMRS Power Reallocation for Accurate Channel Estimation
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Solution Overview
Problem
In wireless communication networks, particularly in areas with poor coverage quality such as cell edges, the network device struggles to perform accurate channel estimation due to low receiving power of Demodulation Reference Signals (DMRS) sent by terminals, leading to degraded system performance.
Innovation Solution
A method where a terminal increases its sending power for DMRS by occupying part of the sending power on frequency resources not configured for DMRS, allowing the network device to receive the DMRS with sufficient power for accurate channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal uses the configured sending power for DMRS on its assigned frequency resources, then the frequency resources can be properly shared among multiple terminals through CDM groups, but the receiving power of DMRS is insufficient in areas with poor coverage quality
Solution Approach 1:
The terminal borrows a portion of the sending power from frequency resources not configured for DMRS transmission and adds it to the DMRS sending power. This partial action on adjacent resources (power borrowing) resolves the contradiction by providing sufficient DMRS power in poor coverage areas while maintaining the overall power budget and frequency resource allocation structure.
2Power
If the terminal increases DMRS sending power by occupying power from other frequency resources, then the receiving power is sufficient for accurate channel estimation, but the frequency resource allocation and power management becomes more complex
Solution Approach 1:
The terminal autonomously determines and adjusts its DMRS sending power by borrowing from its own allocated power on other frequency resources, without requiring complex network coordination or additional signaling. This self-service approach simplifies the overall system complexity while achieving the power enhancement goal.
Solution Approach 2:
The terminal changes the power parameter of DMRS transmission by borrowing power from other frequency resources, dynamically adjusting the sending power based on channel conditions and coverage requirements. This parameter change enables adaptive power management that resolves the contradiction between sufficient receiving power and system complexity.
3Reliability
If the network device allocates sufficient power for DMRS in all areas, then accurate channel estimation can be achieved everywhere, but the power consumption increases and frequency resource efficiency decreases
Solution Approach 1:
Instead of uniformly increasing DMRS power across all areas, the terminal locally borrows power from frequency resources not used for DMRS, providing enhanced power only where needed (in poor coverage areas) while maintaining efficient power usage in good coverage areas. This local quality approach resolves the contradiction between reliable channel estimation and power consumption efficiency.
Data Source
AI summary
A method for sending a DMRS is provided. A terminal determines a first sending power for sending a first DMRS on a first frequency resource is based on control information from a network device. The first frequency resource is a frequency resource corresponding to a first CDM group among frequency resources corresponding to a first symbol. The first sending power occupies at least part of a second sending power on a second frequency resource other than the first frequency resources among the frequency resources corresponding to the first symbol. The second frequency resource is not configured for sending a second DMRS. The terminal sends the first DMRS sent by the terminal on the first frequency resource based on the first sending power.