SRS Transmission Scheduling in 5G LAA Systems
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Solution Overview
Problem
In 5G communication systems, especially in LAA systems operating on unlicensed frequency bands, there is a challenge in ensuring the Quality of Service (QoS) due to interference from other wireless systems like WiFi, and the transmission probability of SRS and PUSCH is reduced due to the Listen Before Talk (LBT) mechanism, which causes collisions and discontinuous transmission.
Innovation Solution
A method where a terminal receives scheduling signaling to determine if a gap is needed between SRS and PUSCH symbols, and based on this, it decides the time-frequency resource mapping, allowing for transmission or queuing of SRS and PUSCH, and performs CCA detection to minimize interference and increase transmission probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If LBT mechanism is implemented to avoid interference with other wireless systems, then interference with other systems is reduced, but transmission probability of SRS and PUSCH is reduced
Solution Approach 1:
The patent performs CCA detection in advance before SRS and PUSCH transmission to determine channel availability. By conducting the clear channel assessment beforehand and based on the detection result, the system decides whether to perform LBT, thereby reducing unnecessary LBT operations while ensuring interference avoidance when needed.
Solution Approach 2:
The patent dynamically adjusts the LBT execution decision based on real-time CCA detection results. When the channel is detected as idle, LBT may be skipped; when busy, LBT is performed. This dynamic adaptation optimizes transmission probability while maintaining interference avoidance capabilities.
2Object-affected harmful factors
If LBT mechanism is implemented to avoid interference with other wireless systems, then interference with other systems is reduced, but QoS is degraded
Solution Approach 1:
The patent performs CCA detection in advance to assess channel conditions before transmission. Based on this preliminary assessment, the system intelligently decides whether LBT is necessary, thereby reducing unnecessary transmission delays and improving QoS while still avoiding interference when the channel is actually busy.
Solution Approach 2:
The patent changes the transmission parameters dynamically based on CCA results. When channel conditions are good (idle detected), the system can skip LBT and transmit immediately; when conditions are poor (busy detected), LBT is performed. This parameter adaptation balances interference avoidance with QoS maintenance.
3Object-affected harmful factors
If gap is reserved between SRS and PUSCH symbols, then mutual hindrance between uplink physical channels is reduced, but transmission efficiency is reduced
Solution Approach 1:
The patent performs CCA detection in advance to determine channel availability before SRS and PUSCH transmission. Based on this preliminary detection, the system decides whether to reserve a gap between SRS and PUSCH symbols or transmit them continuously, thereby reducing unnecessary gaps and improving transmission efficiency while avoiding mutual hindrance when needed.
Data Source
AI summary
The present application discloses methods performed by a terminal and a base station in a wireless communication system, the methods including receiving configuration information on a sounding reference signal (SRS), the configuration information including a plurality of resource configurations for the SRS; receiving a physical layer signaling including information for triggering an SRS transmission, the information indicating a resource configuration among the plurality of the resource configurations; and transmitting the SRS based on the resource configuration indicated by the information.