SRS Transmission Timing via Subcarrier Spacing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In communications systems, particularly in TDD systems, the timely sending of a sounding reference signal (SRS) by terminal devices is crucial for accurate channel quality measurement and resource allocation by network devices. However, if the SRS is not sent in time, network devices cannot obtain accurate channel information, leading to inefficiencies in resource usage and communication efficiency.
Innovation Solution
A method for determining a valid time interval for sending an SRS based on subcarrier spacing, where the time interval is specific to each subcarrier spacing (15 kHz, 30 kHz, 60 kHz, and 120 kHz) to ensure the SRS is sent promptly, allowing network devices to accurately measure channel quality and allocate resources effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the terminal device sends SRS immediately upon receiving DCI, then the channel quality measurement timeliness is improved, but the processing time and reliability of the terminal device may be compromised
Solution Approach 1:
The patent pre-configures multiple candidate time intervals (K1, K2, K3 values) corresponding to different subcarrier spacings before actual SRS transmission. When DCI is received, the terminal device can immediately select from these pre-determined intervals based on the current subcarrier spacing, avoiding real-time calculation delays while ensuring the selected interval meets processing reliability requirements.
Solution Approach 2:
The patent establishes different time interval parameters for different subcarrier spacings (15kHz, 30kHz, 60kHz, 120kHz). As the subcarrier spacing parameter changes, the appropriate time interval parameter is selected from the pre-configured candidates, optimizing the balance between timeliness and reliability for each specific scenario.
2Productivity
If a fixed time interval is used for all subcarrier spacings, then the system complexity is reduced, but the communication efficiency and resource allocation accuracy deteriorate
Solution Approach 1:
The patent applies different time interval characteristics to different subcarrier spacing scenarios. Each subcarrier spacing (15kHz, 30kHz, 60kHz, 120kHz) has its own optimized candidate time intervals, allowing the system to achieve high communication efficiency for each specific case without requiring a complex unified solution.
Solution Approach 2:
The patent segments the time interval selection into multiple discrete candidate values (K1, K2, K3) corresponding to different subcarrier spacings. This segmentation allows the terminal device to efficiently select from predefined options rather than calculating optimal intervals in real-time, maintaining low complexity while improving productivity.
3Measurement precision
If multiple candidate time intervals are configured for different subcarrier spacings, then the SRS sending timeliness and resource allocation accuracy are improved, but the signaling overhead and device complexity increase
Solution Approach 1:
The patent creates a universal time interval configuration mechanism that works across all subcarrier spacings (15kHz, 30kHz, 60kHz, 120kHz). The same set of candidate time intervals serves multiple functions by being selectively applied based on the current subcarrier spacing, reducing the need for separate configurations for each scenario.
Solution Approach 2:
The patent uses parameter-based selection where the subcarrier spacing value directly determines which candidate time interval from the predefined set should be used. This parameter-driven approach allows the system to achieve high measurement precision for channel quality while keeping device complexity manageable through systematic parameter mapping.
Data Source
AI summary
This application provides a method and an apparatus for sending an SRS. When receiving first indication information indicating to send an SRS, a terminal device may determine a first time interval in a plurality of candidate first time intervals, where the first time interval is used to determine whether the first indication information is valid, and the terminal device may send the SRS based on the first time interval.