Autonomous SRS Triggering via Decoding Parameters
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, there is a challenge in acquiring channel state information (CSI) in a timely manner for retransmissions due to the delay in receiving sounding reference signals (SRS) from user equipment (UE) triggered by the base station, which can lead to inefficient resource usage and poor communication quality under poor channel conditions.
Innovation Solution
The UE is configured to autonomously transmit aperiodic sounding reference signals (SRS) based on decoding parameters such as negative acknowledgement (NACK) feedback, modulation and coding scheme (MCS), log likelihood ratio (LLR), bit error rate (BER), and signal-to-interference-and-noise ratio (SINR), allowing for more efficient CSI reporting and improved communication quality without relying on base station triggers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station triggers SRS transmission periodically, then the UE can transmit reference signals for CSI acquisition, but there is a delay in receiving SRS that leads to inefficient resource usage and poor communication quality under poor channel conditions
Solution Approach 1:
The UE autonomously transmits aperiodic SRS based on decoding parameters (such as NACK feedback, MCS, LLR, BER, SINR) without waiting for base station triggers. This preliminary action allows the UE to proactively report channel conditions when poor quality is detected, eliminating the delay inherent in periodic base-station-triggered SRS transmission while ensuring timely CSI acquisition for retransmissions
2Reliability
If the base station triggers SRS transmission, then SRS can be transmitted for CSI reporting, but resource usage becomes inefficient due to fixed periodic triggers that do not adapt to actual channel conditions
Solution Approach 1:
The SRS transmission scheme transitions from static periodic triggering to dynamic autonomous transmission. The UE monitors decoding parameters in real-time and autonomously decides when to transmit SRS based on actual channel conditions (e.g., when SINR falls below a threshold or NACK feedback is received). This dynamic adaptation ensures SRS is transmitted only when necessary, improving both CSI timeliness and resource efficiency
Solution Approach 2:
The UE autonomously determines when SRS transmission is needed by monitoring its own decoding parameters without requiring base station intervention. The UE self-manages the timing and triggering of SRS based on its observed channel conditions, eliminating the inefficiency of fixed periodic triggers while ensuring timely CSI reporting when channel quality degrades
Data Source
AI summary
Aspects described herein relate to receiving one or more downlink transmissions from a base station, and transmitting, based on comparing one or more parameter values of the one or more downlink transmissions to one or more threshold values, a sounding reference signal (SRS) to the base station over uplink resources. Other aspects relate to receiving, from a user equipment (UE), feedback related to decoding one or more downlink transmissions, wherein the feedback includes an indication that the UE is transmitting a SRS, and receiving, based on the indication, the SRS from the UE over uplink resources.