DMRS Power Boosting for Uplink Shared Channel Resource Sharing
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Solution Overview
Problem
In LTE systems, determining the transmit power of Demodulation Reference Signals (DMRS) for short data transmissions in a frequency division multiplexing mode with a comb-like pattern is challenging, especially when multiple user equipment (UEs) share the same resource region, affecting channel estimation accuracy.
Innovation Solution
The UE determines the transmit power of DMRS based on the data transmit power and a pilot power boosting factor, which is proportional to the number of UEs sharing the same symbol, ensuring the DMRS power is boosted within the same resource element, thereby improving channel estimation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple UEs share the same resource region with comb-like pattern DMRS in frequency division multiplexing mode, then resource utilization is improved, but channel estimation accuracy deteriorates due to power allocation conflicts
Solution Approach 1:
The patent changes the power allocation parameter from equal power distribution to proportional power distribution based on the number of UEs sharing the resource region. Each UE's DMRS power is adjusted according to a calculated factor that considers the total number of UEs, thereby maintaining channel estimation accuracy while enabling multiple UEs to share the same resource region effectively.
2Measurement precision
If DMRS power is boosted for short data transmissions, then channel estimation accuracy is improved, but interference to other signals worsens
Solution Approach 1:
The patent applies local quality by differentiating power allocation based on the specific resource element type. Data symbols receive one power level while DMRS symbols receive a different power level determined by the number of sharing UEs. This localized power adjustment ensures sufficient DMRS power for accurate channel estimation without causing excessive interference to other signals.
3Device complexity
If DMRS are transmitted in the same symbol with comb-like pattern, then device complexity is reduced, but determining transmit power becomes more difficult
Solution Approach 1:
The patent implements a self-service mechanism where each UE autonomously determines its DMRS transmit power based on locally available information (the number of UEs sharing the resource region). The power calculation follows a standardized formula that UEs can compute independently, eliminating the need for complex centralized power allocation control while simplifying the transmission structure.
Data Source
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Figure 3A~3B
AI summary
Disclosed are a pilot frequency transmission method for an uplink shared channel, and a related device, which are used for solving the problem of how to determine a pilot frequency transmitting power where frequency division multiplexing transmission is performed on a plurality of pilot frequency sequences for short data transmission in the same resource areas by means of a comb-like structure. The method comprises: a terminal determining a transmitting power of data borne by an uplink shared channel; according to the transmitting power of the data borne by the uplink shared channel and a pilot frequency power lifting factor of the terminal, the terminal determining a transmitting power of a pilot frequency of the uplink shared channel, wherein the pilot frequency power lifting factor is used for representing a multiple of the transmitting power of the pilot frequency of the uplink shared channel on a resource element with respect to the transmitting power of the data borne by the uplink shared channel on a resource element, the multiple is greater than or equal to 1, and the pilot frequency is transmitted in a time domain symbol occupied by the pilot frequency by means of a comb-like structure; and the terminal sending the pilot frequency of the uplink shared channel according to the transmitting power of the pilot frequency.