SRS Transmission Frequency Adaptation for Wireless Throughput
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Solution Overview
Problem
In wireless communication networks, frequent transmission of sounding reference signals (SRS) consumes significant radio resources, leading to reduced system throughput, especially in high carrier frequency environments and highly beamformed communications.
Innovation Solution
A method where a wireless communication device determines a recommendation for SRS transmission frequency based on its speed, sending SRS more frequently for lower speeds and less frequently for higher speeds, and transmits this recommendation to a network node for configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the wireless communication device sends SRS more frequently to sound the channel on a shorter timescale, then the channel estimation accuracy is improved, but the system throughput in the uplink deteriorates due to consumption of radio resources
Solution Approach 1:
The patent implements dynamic SRS transmission configuration where the network adapts the SRS period based on device mobility characteristics. Fast-moving devices are configured with shorter SRS periods (e.g., 2ms) to maintain accurate channel estimation, while slow-moving devices use longer periods (e.g., 320ms) to conserve resources. This dynamic adaptation resolves the contradiction by matching SRS frequency to actual channel variation rates.
Solution Approach 2:
The network changes the temporal parameter (SRS period) of SRS transmission based on device speed metrics. By adjusting the period parameter from 2ms to 320ms depending on mobility conditions, the system optimizes the balance between channel estimation accuracy and resource consumption, thereby maintaining throughput while ensuring sufficient channel sounding.
2Speed
If the network configures fast moving devices to send SRS more frequently, then the channel sounding on a shorter timescale is achieved, but the radio resource consumption increases
Solution Approach 1:
The system dynamically adjusts SRS transmission frequency based on real-time device mobility assessment. The network evaluates device speed and correspondingly configures the SRS period, creating a dynamic relationship between mobility state and resource allocation. This ensures high channel sounding rates only when necessary (for fast-moving devices), minimizing unnecessary radio resource consumption.
Solution Approach 2:
Different SRS configuration parameters are assigned to different devices based on their individual mobility characteristics. Fast-moving devices receive aggressive SRS configurations (short periods), while slow-moving devices receive conservative configurations (long periods). This localized optimization ensures each device consumes only the radio resources necessary for its specific channel conditions.
3Quantity of substance
If the network configures slow moving devices to send SRS less frequently, then the radio resources are conserved, but the channel sounding on a longer timescale is required
Solution Approach 1:
The network extends the SRS period parameter for slow-moving devices (e.g., to 320ms) based on their mobility assessment. This parameter change aligns the channel sounding interval with the longer channel coherence time characteristic of slow-moving devices, conserving radio resources while maintaining sufficient channel estimation accuracy for their stable channel conditions.
Data Source
AI summary
A wireless communication device (12) is configured for use in a wireless communication network (10). The wireless communication device (12) obtains a value of a metric (22) that indicates a speed at which the wireless communication device (12) moves. The wireless communication device (12) determines, based on the value of the metric (22), an indication (15) that indicates a recommendation of how often the wireless communication device (12) is to send the SRS (18) and/or of whether the wireless communication device (12) is to send the SRS (18) periodically or aperiodically. The wireless communication device (12) transmits the indication (15) to a network node (14) in the wireless communication network (10). The network node (14) determines, taking into account the indicated recommendation, how often the wireless communication device (12) is to send the SRS (18) and/or whether the wireless communication device (12) is to send the SRS (18) periodically or aperiodically.