Sounding Reference Signal Assignment by Channel Distortion
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Solution Overview
Problem
Existing methods for assigning sounding reference signals (SRS) in mobile communication systems do not adequately account for the degree of channel distortion, leading to inefficient SRS transmission and reduced data communication due to mismatched frequency resource allocation and beamforming.
Innovation Solution
A radio communication apparatus and method that calculates the degree of frequency response distortion between the apparatus and a terminal, using this to determine the appropriate transmission interval and bandwidth for SRS, thereby aligning with the channel's temporal changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission frequency of SRS is increased to follow channel changes, then the base station can cope with temporal changes of the channel, but the frequency resources available for data communication are reduced
Solution Approach 1:
The patent changes the parameter of SRS transmission by adjusting both the transmission interval and bandwidth based on terminal moving speed. For high-speed terminals, it shortens the transmission interval and reduces bandwidth to maintain channel tracking while conserving resources. For low-speed terminals, it lengthens the interval and increases bandwidth to reduce overhead while maintaining adequate channel knowledge.
Solution Approach 2:
The patent makes the SRS transmission configuration dynamic by adapting it to the terminal's moving speed conditions. The base station determines the terminal's speed and dynamically adjusts the SRS transmission parameters accordingly, allowing the system to optimize the balance between channel tracking accuracy and resource efficiency based on current channel variation conditions.
2Quantity of substance
If the transmission frequency of SRS is decreased to preserve frequency resources, then more resources are available for data communication, but the base station cannot follow temporal changes of the channel
Solution Approach 1:
The patent adjusts SRS transmission parameters (interval and bandwidth) based on terminal moving speed to achieve resource efficiency. For low-speed terminals with stable channels, it increases the transmission interval and bandwidth, reducing SRS overhead while maintaining adequate channel tracking capability.
Solution Approach 2:
The system dynamically adapts SRS transmission configuration to match actual channel variation conditions. By linking transmission parameters to terminal speed, the system optimizes resource allocation, reducing unnecessary SRS transmissions for stable channels while maintaining adequate tracking for varying channels.
3Productivity
If SRS transmission is assigned based solely on terminal moving speed, then high-speed terminals receive appropriate bandwidth allocation, but terminals with high speed experience excessive SRS assignment due to other channel change factors
Solution Approach 1:
The patent refines the SRS assignment by adjusting both transmission interval and bandwidth parameters based on a comprehensive evaluation of channel conditions. It moves beyond simple speed-based assignment to consider multiple factors affecting channel variation, optimizing the balance between assignment frequency and resource efficiency for each terminal.
Solution Approach 2:
The patent applies differentiated SRS assignment strategies tailored to individual terminal conditions and channel characteristics. Instead of uniform high-speed-based assignment, it customizes transmission parameters for each terminal based on its specific channel environment, reducing unnecessary assignments while maintaining adequate channel knowledge where needed.
Data Source
AI summary
A radio communication apparatus includes a distortion calculation unit and an assignment unit. The distortion calculation unit calculates the degree of distortion of the frequency response of the channel between the radio communication apparatus and the radio terminal. Further, the assignment unit assigns the reference signal to the radio terminal based on the degree of distortion calculated by the distortion calculation unit.