Adaptive SRS Configuration for Fast-Changing Satellite Uplink Sync
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Solution Overview
Problem
Traditional SRS methods struggle to timely capture uplink timing and frequency deviations in satellite communication systems due to rapid changes in Doppler shift and transmission delay caused by satellite movement, especially in low earth orbit scenarios where terminals face challenges in real-time synchronization with inaccurate positioning information.
Innovation Solution
Adaptive SRS configuration based on uplink-related information, such as terminal speed, frequency offset, and signal-to-noise ratio, to dynamically adjust SRS parameters like symbol intervals, repetition numbers, and resource mapping, enabling timely estimation of timing and frequency offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional SRS methods are used for uplink timing and frequency offset correction, then the system can maintain basic synchronization, but it cannot timely capture rapid changes in Doppler shift and transmission delay caused by satellite movement
Solution Approach 1:
The patent implements dynamic SRS configuration where transmission parameters (period, bandwidth, resource allocation) are continuously adjusted based on real-time uplink channel conditions and satellite movement characteristics. This allows the system to adapt to rapidly changing Doppler shifts and transmission delays, resolving the contradiction between measurement precision and time loss by making the SRS system responsive to dynamic satellite-terminal relative motion.
Solution Approach 2:
The patent changes key SRS parameters including transmission period, bandwidth, and resource allocation based on detected uplink channel conditions. By dynamically modifying these parameters, the system can capture timing and frequency offsets more accurately and timely, overcoming the limitations of fixed traditional SRS configurations in satellite communication scenarios with rapid relative motion.
2Adaptability or versatility
If SRS transmission parameters are fixed according to traditional methods, then the configuration is simple and stable, but it cannot adapt to rapid changes in Doppler frequency shift and transmission delay
Solution Approach 1:
The patent establishes a feedback mechanism where the network device monitors uplink channel conditions and terminal movement status, then dynamically adjusts SRS transmission parameters accordingly. This feedback loop enables the system to adapt to rapid satellite movement while managing complexity through automated parameter adjustment based on measured channel state, resolving the contradiction between adaptability and configuration complexity.
Solution Approach 2:
The terminal autonomously determines its uplink channel conditions and movement characteristics, then self-configures SRS transmission parameters without requiring complex network-side intervention for each adjustment. This self-service approach enhances adaptability to rapid satellite movement while reducing overall system complexity by distributing the adaptation intelligence to the terminal.
Data Source
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AI summary
Provided are a method and apparatus for transmitting a sounding reference signal (SRS), and a network device, a terminal and a storage medium. The method for transmitting SRS comprises: determining SRS configuration information on the basis of uplink related information corresponding to a terminal; issuing the SRS configuration information to the terminal; and receiving a SRS signal sent by the terminal on the basis of the SRS configuration information. By means of the method and apparatus, the network device, the terminal and the storage medium provided in the embodiments in the present disclosure, SRS configuration information is determined on the basis of uplink-related information, and the dynamic configuration of SRS-related parameters is realized, such that the related configuration of a SRS can better adapt to rapid changes in a Doppler frequency shift and a transmission delay caused by fast movement of a satellite, an uplink time-frequency estimation can resist fastchanging timing and frequency deviations, and the timeliness requirement of the uplink time-frequency estimation is satisfied.