Uplink Reference Signal Power Allocation for Better Channel Estimation
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Solution Overview
Problem
Existing communication networks face challenges in achieving good performance and capacity due to poor SRS coverage, which limits channel estimation quality, especially in high-frequency bands, leading to increased overhead and latency in SRS transmission.
Innovation Solution
A method for terminal devices to distribute transmission power for uplink reference signals based on channel quality, allocating more power to frequency parts with better channel conditions, thereby improving channel estimation and reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uplink reference signals are transmitted using the same resources as downlink reference signals, then device complexity is reduced, but interference between uplink and downlink signals increases
Solution Approach 1:
The patent segments the resource allocation by introducing separate resource elements for uplink and downlink reference signals within the same time-frequency grid. This allows both signal types to be transmitted simultaneously without mutual interference while maintaining system efficiency.
Solution Approach 2:
The patent uses resource element indicators as intermediaries to distinguish between uplink and downlink reference signals. These indicators enable the receiver to properly identify and separate the signals, allowing them to be transmitted on the same resources without interference.
2Reliability
If uplink reference signals are transmitted with high power to ensure detection, then signal detection reliability improves, but interference with downlink signals increases
Solution Approach 1:
By segmenting the resource elements into dedicated uplink and downlink portions, the patent enables high-power transmission of uplink reference signals without affecting downlink signal quality. Each signal type has its own isolated resource space.
Solution Approach 2:
The patent employs resource element indicators as identifying markers (analogous to color changes) that allow the receiver to distinguish between uplink and downlink reference signals. This enables reliable detection of high-power uplink signals while maintaining downlink signal integrity through proper signal identification and separation.
Data Source
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Figure 3
AI summary
There is provided mechanisms for transmitting uplink reference signals. A method is performed by a terminal device. The method comprises obtaining, from a network node, a configuration of transmission of the uplink reference signals. The configuration comprises an indication of a first frequency interval in which the uplink reference signals are to be transmitted. The method comprises distributing transmission power available for transmitting the uplink reference signals over the first frequency interval based on channel information for the first frequency interval. The method comprises transmitting the uplink reference signals in accordance with the distributed transmission power.