Uplink Data Scheduling Using PUSCH DMRS Channel Estimates

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Solution Overview

Problem

Existing 5G wireless communication systems face inefficiencies in scheduling uplink data due to the overhead and latency associated with periodic transmission of sounding reference signals (SRS) for channel state information, which reduces resources available for data traffic and impacts latency-sensitive applications like ultra-reliable low-latency communication (URLLC).

Innovation Solution

Utilizing demodulation reference signals (DMRS) on scheduled physical uplink shared channels (PUSCH) to estimate channel state information, allowing for reduced periodicity of SRS transmission and enabling efficient computation of scheduling parameters without waiting for periodic SRS, thereby optimizing resource utilization and reducing latency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If periodic sounding reference signals (SRS) are transmitted for channel state information, then channel estimation accuracy is improved, but signaling overhead increases and resources for data traffic are reduced

Engineering Contradiction:

Improvechannel estimation accuracyVSAvoidsignaling overhead

Core Design Contradiction:

Measurement precisionVSLoss of substance

Solution Approach 1:

The patent extracts the channel estimation function from the periodic SRS mechanism and relocates it to the DMRS on scheduled PUSCH transmissions. This eliminates the need for separate periodic SRS resources, thereby reducing signaling overhead while maintaining channel estimation capability through the data channel's reference signals.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The DMRS on PUSCH serves dual purposes: it acts as both a demodulation reference signal for the data channel and as the source for channel state information estimation. This multi-functionality eliminates the need for dedicated SRS resources, reducing overall signaling overhead while maintaining measurement precision.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Measurement precision

If periodic sounding reference signals (SRS) are transmitted for channel state information, then channel estimation is enabled, but transmission latency increases due to waiting for periodic SRS

Engineering Contradiction:

Improvechannel state information estimationVSAvoidtransmission latency

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent enables channel estimation to be performed preliminarily using DMRS on scheduled PUSCH transmissions before actual data transmission begins. This eliminates the waiting time for periodic SRS to arrive, allowing the network to compute scheduling parameters immediately and reduce transmission latency for latency-sensitive applications.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Instead of periodic, intermittent SRS transmissions, the system continuously utilizes DMRS on scheduled PUSCH for channel estimation. This continuous availability of channel state information eliminates gaps and waiting periods, enabling real-time scheduling decisions and reducing latency.

Inventive Principle:

Principle #20Continuity of useful action

3Measurement precision

If periodic sounding reference signals (SRS) are transmitted, then channel state information is obtained, but system capacity is reduced due to resource allocation for SRS

Engineering Contradiction:

Improvechannel state informationVSAvoidsystem capacity

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent extracts the channel state information acquisition function from dedicated SRS resources and relocates it to the data channel's DMRS. This eliminates the separate resource allocation for SRS, freeing up time-frequency resources that can be reallocated to data traffic, thereby increasing overall system capacity.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The system discards the periodic SRS transmission mechanism and recovers the resources previously allocated for SRS. These recovered resources are then available for data traffic, increasing system capacity while channel estimation functionality is maintained through DMRS on PUSCH.

Inventive Principle:

Principle #34Discarding and recovering

Data Source

PatentUS12463742B2Scheduling of uplink data using demodulation reference signal and scheduled resources

Publication Date: 2025.11.04 AT&T INTELLECTUAL PROPERTY I L P

AI summary

Various embodiments disclosed herein provide for facilitating scheduling of uplink data using demodulation reference signal and scheduled resources. According to an embodiment, a system can comprise configuring a network device with a periodic rate of specified sounding reference signals with a periodicity using radio resource control signaling. The system can further facilitate estimating channel state information associated with a channel via which the network device communicates. The system can further facilitate transmitting an uplink grant with uplink transmission parameters to set up a physical uplink shared channel, wherein the uplink transmission parameters are determined based on the channel state information. The system can further facilitate estimating scheduling parameters based on a first estimation information associated with the physical uplink shared channel.