Aperiodic SRS Transmission Logic for Wireless Uplink Reliability
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Solution Overview
Problem
In wireless communication systems, the absence of reliable detection for aperiodic SRS transmissions due to multiple DCI formats with different SRS request parameters can lead to incorrect channel estimation and interference, affecting UL system throughput and communication quality.
Innovation Solution
A UE determines whether to transmit an aperiodic SRS based on identical or different SRS request field values across multiple DCI formats, ensuring transmission only when all indicate the same configuration of parameters to avoid interference and ensure accurate channel estimation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple DCI formats with different SRS request parameters are used to trigger aperiodic SRS transmissions, then the system can provide flexible scheduling control, but reliable detection of SRS transmissions becomes difficult leading to incorrect channel estimation
Solution Approach 1:
The patent applies feedback mechanisms where the UE monitors multiple DCI formats and uses this feedback information to determine whether to transmit aperiodic SRS. The UE compares SRS request field values across different DCI formats and adjusts its transmission behavior accordingly, ensuring reliable detection while maintaining scheduling flexibility.
Solution Approach 2:
The patent changes the parameter interpretation by introducing a comparison mechanism for SRS request field values. Instead of treating each DCI format independently, the system compares parameters across multiple DCI formats and uses this comparison to determine transmission behavior, resolving the detection reliability issue while preserving scheduling adaptability.
2Productivity
If a UE transmits aperiodic SRS in response to multiple DCI formats with different configurations, then the system can dynamically adjust channel estimation, but interference occurs and estimation accuracy deteriorates
Solution Approach 1:
The patent applies preliminary anti-action by having the UE check for conflicting DCI formats before transmitting aperiodic SRS. The UE compares SRS request field values across multiple DCI formats and prevents transmission when conflicts are detected, thereby avoiding interference and maintaining estimation accuracy before the harmful effect can occur.
Solution Approach 2:
Instead of transmitting SRS whenever triggered by any DCI format, the patent inverts the logic by requiring consistent triggering across all relevant DCI formats. The UE only transmits when all DCI formats agree on the SRS request, which prevents interference while maintaining the ability to dynamically adjust channel estimation when conditions are favorable.
3Loss of time
If the UE transmits aperiodic SRS based on any single DCI format trigger, then the response time is reduced, but incorrect transmissions occur leading to system throughput degradation
Solution Approach 1:
The patent applies preliminary action by having the UE prepare and compare DCI format configurations in advance before the actual SRS transmission. The UE monitors multiple DCI formats and performs comparison operations beforehand, so that when transmission time arrives, the decision is already made, minimizing response time loss while preventing incorrect transmissions.
Data Source
AI summary
Methods and apparatuses are provided for sounding reference signal (SRS) transmission. A plurality of parameter sets are received for an aperiodic SRS transmission. First downlink control information is received comprising an SRS request field with a first value indicating one of the plurality of parameter sets. Second downlink control information is received comprising an SRS request field with a second value indicating one of the plurality of parameter sets. A transmission of an aperiodic SRS is determined based on whether the first value is identical to the second value.