AP-SRS Triggering Offset Adjustment for 5G Uplink Scheduling
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Solution Overview
Problem
The triggering of aperiodic sounding reference signals (AP-SRS) in wireless communication networks often fails due to mismatched time slots, leading to inefficient transmission and reduced spectral efficiency, especially in 5G networks where high data rates and massive MIMO deployments are critical.
Innovation Solution
A method where network nodes send AP-SRS configuration messages with offsets to User Equipment (UEs), prioritizing them to transmit AP-SRS in valid time slots, ensuring that UEs receive trigger signals at appropriate times to send AP-SRS in dedicated SRS slots, thereby improving the likelihood of successful triggering and scheduling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If AP-SRS triggering is implemented with fixed offset configuration, then the transmission timing is simplified, but the triggering fails when the calculated TTI is not a valid SRS TTI
Solution Approach 1:
The patent applies dynamics by making the AP-SRS triggering mechanism adaptive rather than fixed. The network node dynamically determines whether to apply the offset configuration based on whether the calculated TTI corresponds to a valid SRS TTI. When the initial calculation fails, the system dynamically adjusts by applying additional offsets until a valid TTI is found, transforming a static triggering mechanism into a flexible, condition-based system that maintains reliability without excessive complexity.
Solution Approach 2:
The patent changes the parameter of time slot offset dynamically. Instead of using a fixed offset value from configuration, the system modifies the offset parameter by adding additional offsets (N additional offsets) when the initial TTI calculation does not yield a valid SRS TTI. This parameter adjustment ensures that the triggering succeeds while maintaining the overall simplicity of the offset-based mechanism.
2Ease of operation
If AP-SRS offset configuration is used for multiple UEs, then the scheduling is simplified, but conflicts occur when multiple UEs are triggered in the same TTI
Solution Approach 1:
The patent implements feedback by having the network node monitor and determine whether multiple UEs are scheduled to transmit AP-SRS in the same TTI. When such a conflict is detected, the system provides feedback by adjusting the offset for the conflicting UE(s), applying additional offsets to reschedule them in different TTIs. This feedback loop ensures conflict-free transmission while maintaining the simplified offset-based scheduling approach.
Solution Approach 2:
The system dynamically adjusts the offset configuration for individual UEs based on real-time scheduling conditions. When conflicts are detected among multiple UEs, the network node dynamically modifies the offset parameter for specific UEs to distribute their transmissions across different valid TTIs, maintaining ease of operation through offset-based scheduling while ensuring reliable conflict-free transmission.
3Speed
If the network node sends trigger signals without validating SRS TTI, then the signaling is faster, but the AP-SRS transmission fails due to timing mismatch
Solution Approach 1:
The patent applies preliminary action by having the network node perform validation of the calculated TTI against valid SRS TTIs before sending the trigger signal. The system pre-calculates the TTI using the offset configuration, then preliminarily checks whether this TTI corresponds to a valid SRS TTI. If validation fails, the system preliminarily adjusts the offset by adding additional offsets before triggering, ensuring that the trigger signal is only sent when transmission is guaranteed to succeed, thus maintaining both speed and reliability.
Data Source
AI summary
A method by a network node controls transmission of uplink APeriodic Sounding Reference Signals, AP-SRS. Sending to UEs in a same cell an AP-SRS configuration message comprising an offset corresponding to each UE. The offset defining after how many time slots from receiving a trigger signal each UE should transmit the AP-SRS. Prioritizing the UEs being triggered by the trigger signals in accordance with the sent corresponding offset.