Sounding Reference Signal Transmission Frequency Adaptation
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Solution Overview
Problem
In wireless communication networks, frequent transmission of sounding reference signals (SRS) consumes significant radio resources, jeopardizing system throughput, especially in high carrier frequency and low latency scenarios, such as those involving high-speed devices and massive MIMO systems.
Innovation Solution
A network node determines the frequency of SRS transmission based on a speed metric, sending SRS more often for devices below a certain threshold speed and less often or not at all for devices above the threshold, to conserve radio resources and improve uplink data throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the network configures wireless communication devices to send SRS more frequently for channel sounding, then the channel estimation accuracy is improved, but the uplink data throughput deteriorates due to consumption of radio resources
Solution Approach 1:
The patent applies dynamics by making the SRS transmission periodicity adaptive rather than fixed. The network node dynamically adjusts the SRS transmission period based on the device's speed metric - faster moving devices receive shorter periods (more frequent SRS) while slower devices receive longer periods (less frequent SRS). This dynamic adaptation resolves the contradiction by optimizing channel estimation frequency to match actual channel variation rates, improving throughput without sacrificing necessary measurement accuracy.
Solution Approach 2:
The patent changes the parameter of SRS transmission periodicity based on the device speed metric. By introducing speed-based parameter adjustment, the system transitions from a static configuration to a variable one where the SRS period is modified according to device mobility conditions. This parameter change enables the system to allocate radio resources efficiently - reducing SRS frequency for slow devices to preserve throughput while maintaining adequate channel sounding for fast devices.
2Speed
If the network configures fast moving devices to send SRS more frequently, then the channel sounding timescale is reduced, but the radio resource consumption increases
Solution Approach 1:
The patent applies local quality by differentiating SRS transmission configurations based on individual device characteristics (speed metric). Instead of applying a uniform SRS periodicity to all devices, the network node assigns different periodicity values to different devices according to their mobility patterns. This localized optimization ensures that radio resources are consumed only where necessary - by fast-moving devices that actually require frequent channel sounding - while slow devices consume fewer resources.
3Reliability
If the network increases SRS transmission frequency for all devices, then the channel tracking capability is improved, but the system throughput deteriorates
Solution Approach 1:
The patent applies partial action by providing SRS transmission only to the extent necessary for each device based on its speed metric. Rather than configuring all devices to send SRS at maximum frequency, the network node selectively applies frequent SRS transmission only to fast-moving devices that require enhanced channel tracking. Slow-moving devices receive reduced or eliminated SRS configurations, maintaining adequate channel tracking capability while avoiding excessive radio resource consumption that would harm system throughput.
Data Source
AI summary
A network node (14) is configured for use in a wireless communication network (10). The network node (14) obtains a value of a metric (22) that indicates a speed at which a wireless communication device (12) moves. The network node (14) also determines. based on the value of the metric (22). how often the wireless communication device (12) is to send a sounding reference signal. SRS. (18), wherein the wireless communication device (12) is to send the SRS (18) more often for at least one value of the metric (22) below a threshold as compared to for at least one value above the threshold. The network node (14) transmits. to the wireless communication device (12), signaling (16) that configures or triggers the wireless communication device (12) to send the SRS (18) as often as determined.