Aperiodic SRS Transmission in TDD Special Subframes
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Solution Overview
Problem
In TDD systems, the transmission position of aperiodic SRS in special subframes is undefined when multiple symbols are available for transmission, leading to inefficiencies and resource overuse.
Innovation Solution
The solution defines a specific symbol or strategy for transmitting aperiodic SRS in special subframes, allowing terminal equipment and network-side equipment to determine and configure the transmission symbol through various methods, such as presetting symbol indexes, dynamic indication, or using user system parameters, ensuring consistent and efficient transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If aperiodic SRS is transmitted in special subframes with multiple available symbols, then the flexibility of channel information acquisition is improved, but the transmission position becomes undefined leading to resource overuse
Solution Approach 1:
The patent applies parameter changes by dynamically selecting the transmission symbol index based on configurable parameters. The symbol index for aperiodic SRS transmission is determined by parameters such as the number of available symbols in the special subframe, higher-layer configuration, and dynamic indicators. This allows the system to adapt the transmission position according to different scenarios while maintaining defined and efficient resource usage.
2Adaptability or versatility
If multiple symbols are made available for aperiodic SRS transmission in special subframes, then transmission flexibility is improved, but determination of the specific transmission symbol becomes undeterminable
Solution Approach 1:
The patent implements feedback mechanisms where the network side provides configuration information and indicators to the terminal equipment to determine the specific transmission symbol. The terminal equipment feeds back channel information based on the transmitted aperiodic SRS, creating a closed-loop system. This feedback approach ensures that while multiple symbols are available for flexibility, the specific transmission position is clearly determined through coordinated signaling between network and terminal.
Solution Approach 2:
The patent applies dynamics by making the transmission symbol selection adaptable to different scenarios. The symbol index can be dynamically determined based on real-time conditions such as the number of available symbols in the special subframe, higher-layer configuration parameters, and dynamic indicators in downlink control information. This dynamic approach maintains ease of operation while preserving transmission flexibility.
3Quantity of substance
If aperiodic SRS replaces periodic SRS transmission, then resource consumption is reduced, but the transmission position in special subframes becomes ambiguous
Solution Approach 1:
The patent applies preliminary action by pre-configuring the parameters needed for aperiodic SRS transmission determination. Higher-layer configuration information is provided in advance, including parameters related to special subframe structure and SRS transmission. This preliminary configuration ensures that when aperiodic SRS needs to be transmitted, the transmission position can be immediately and unambiguously determined without losing position information, while still achieving reduced resource consumption compared to periodic SRS.
Data Source
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AI summary
Disclosed are a method and a device for transmitting an aperiodic SRS in a TDD system. In the technical solution of the present invention,a symbol is defined for the transmission of the aperiodic SRS in a special subframe in the TDD system.This avoids a scenario in which the transmission position of the aperiodic SRS is undefined when a plurality of symbols that can be used to transmit the aperiodic SRS are available in an uplink pilot time slot (UpPTS). The problem of transmitting aperiodic SRS in a TDD system special subframe is thus solved. The modification to corresponding instruction messages is not extensive, and there is no overuse of system resources.