NACK-Triggered SRS Transmissions for 5G Latency Reduction
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Solution Overview
Problem
In 5G wireless communication systems, the existing process of waiting for a negative acknowledgement (NACK) from a user equipment (UE) for downlink data transmission is slow, leading to insufficient time for the base station (BS) to acquire channel state information (CSI) for re-transmitting data, thereby increasing latency and reducing network efficiency.
Innovation Solution
Allowing the UE to autonomously transmit a sounding reference signal (SRS) along with a NACK, enabling the BS to receive CSI sooner and potentially re-transmit data more promptly, thereby reducing latency and improving network efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE waits for a NACK from the BS before transmitting SRS, then the transmission process follows standard protocol procedures, but the time delay increases and network efficiency decreases
Solution Approach 1:
The UE transmits the SRS signal before receiving the NACK confirmation from the BS. By performing the SRS transmission in advance (preliminarily) based on detected downlink errors, the system eliminates the waiting time for NACK while maintaining protocol compliance through error detection mechanisms.
2Reliability
If the BS waits for NACK confirmation before acquiring CSI for re-transmission, then the protocol flow is maintained, but the time for acquiring CSI increases and re-transmission is delayed
Solution Approach 1:
The BS acquires CSI through SRS transmission before the NACK confirmation is received. This preliminary acquisition of channel state information enables faster re-transmission decisions and execution, improving productivity while maintaining protocol flow control through proper timing and resource allocation.
3Productivity
If the UE transmits SRS autonomously with NACK, then the time for BS to receive CSI is reduced and network efficiency improves, but the device complexity and protocol management become more challenging
Solution Approach 1:
The UE autonomously decides to transmit SRS based on its own error detection capabilities without requiring explicit BS triggering. This self-service approach reduces network latency and improves efficiency, while the complexity is managed through well-defined autonomous decision criteria based on downlink error detection.
Data Source
AI summary
Wireless communications systems and methods related to negative acknowledgement (NACK)-triggered sounding reference signal transmissions are provided. In some aspects, a user equipment may detect an error when decoding a data transmission received from a base station via a bandwidth part. The UE may then trigger, in response to detecting the error, a transmission to the BS of a first sounding resource signal using a first SRS resource set of the bandwidth part.