SRS Transmission Collision Handling in Wireless Uplink
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Solution Overview
Problem
In wireless communication systems, the transmission of SRS (Sounding Reference Signal) is often delayed due to collisions with other UL channels, leading to increased time for full sounding of the target bandwidth, especially in scenarios where SRS symbols are dropped during resource hopping in next-generation RAT systems.
Innovation Solution
The proposed solution modifies the SRS transmission counting parameter to account for collisions, allowing for partial or full SRS symbol dropping based on priority rules, and adjusts the hopping pattern to ensure continuous SRS transmission, thereby reducing delay by starting SRS transmission with the next available slot.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SRS transmission follows standard hopping pattern without collision handling, then SRS transmission is simple and continuous, but SRS symbols collide with other UL channels causing transmission failures
Solution Approach 1:
The patent applies preliminary action by determining collision information between SRS and other UL channels before SRS transmission occurs. The UE identifies potential collisions in advance and adjusts the hopping pattern proactively, preventing transmission failures rather than reacting to them afterward. This ensures reliable SRS transmission while maintaining manageable complexity through advance planning.
2Reliability
If SRS symbols are dropped due to collision with other UL channels, then collision conflicts are resolved, but time for full sounding of target bandwidth increases
Solution Approach 1:
The patent applies dynamics by making the SRS hopping pattern adaptive rather than fixed. When collisions are detected, the system dynamically adjusts the hopping pattern to skip colliding resources and redirect SRS transmissions to alternative resources. This dynamic adjustment resolves collisions while minimizing time loss by continuing the sounding process without unnecessary delays.
Solution Approach 2:
The patent changes the hopping pattern parameters in response to collision detection. By modifying the frequency offset, time offset, or resource allocation parameters of the hopping pattern, the system avoids colliding resources and maintains efficient SRS transmission. This parameter adjustment resolves collisions while preserving the overall timing structure to minimize sounding time.
3Reliability
If SRS hopping pattern is adjusted to avoid collisions, then SRS transmission reliability improves, but transmission scheduling complexity increases
Solution Approach 1:
The patent implements feedback by having the UE determine collision information between SRS and other UL channels, then use this feedback to adjust the hopping pattern. The system continuously monitors for collisions and adapts the hopping pattern based on this feedback, ensuring reliable transmission while managing complexity through a closed-loop control mechanism that automates the adjustment process.
Data Source
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Figure 2b~3
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AI summary
A method for transmitting, by a terminal, a sounding reference signal (SRS) comprises: a step of, if an SRS transmission and a transmission of an uplink channel collide in a first slot, dropping the transmission of an SRS symbol colliding in the first slot and transmitting an SRS symbol not colliding in the first slot; and a step of transmitting an SRS symbol in a second slot on the basis of a hopping pattern set for the dropped SRS symbol, wherein when the transmission count of the last SRS symbol colliding in the first slot is K, the transmission count for the first SRS symbol transmitted in the second slot is K + 1.