Uplink Scheduling Request Multiplexing for Low-Latency Grants

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Solution Overview

Problem

Existing wireless communication systems face delays in uplink data transmission due to the need for separate scheduling requests and buffer status reports, which are problematic for low-latency applications like extended reality, leading to delays exceeding 10 milliseconds.

Innovation Solution

Enhanced scheduling request (SR) and buffer status report (BSR) communications are introduced to provide rapid uplink grants, allowing BSR to be provided on SR resources and eliminating the need for separate BSR communications, thereby reducing transmission latency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If separate scheduling requests and buffer status reports are used for uplink data transmission, then the system maintains reliable resource allocation, but transmission latency increases exceeding 10 milliseconds

Engineering Contradiction:

Improveresource allocation reliabilityVSAvoidtransmission latency

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent combines the scheduling request (SR) and buffer status report (BSR) into a single uplink transmission. The BSR is multiplexed with the SR on the same physical uplink control channel (PUCCH) resources, eliminating the need for separate transmissions. This merging reduces the total time required for the network to grant uplink resources while maintaining reliable resource allocation through the coordinated information exchange.

Inventive Principle:

Principle #5Merging (Combining)

2Loss of information

If separate BSR communications are used to report buffer status, then the network obtains accurate buffer information, but the communication overhead and transmission time increase

Engineering Contradiction:

Improvebuffer status information accuracyVSAvoidcommunication protocol complexity

Core Design Contradiction:

Loss of informationVSDevice complexity

Solution Approach 1:

The BSR information is merged with the SR transmission by multiplexing the BSR payload on the same PUCCH resources used for SR. This approach maintains accurate buffer status information reporting while reducing communication overhead and protocol complexity by eliminating separate BSR communication procedures.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The uplink transmission mechanism is enhanced to serve multiple functions simultaneously: the same transmission resources carry both the scheduling request (indicating need for uplink resources) and the buffer status report (providing quantitative buffer information). This multi-functionality reduces the number of separate communication procedures needed.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS12543199B2Wireless communication scheduling

Publication Date: 2026.02.03 QUALCOMM INC

AI summary

Aspects of the disclosure are directed to an apparatus configured for wireless communication. In certain aspects, the apparatus is configured to generate data (e.g., generate uplink data and store the data in a buffer until uplink resources are granted for transmission of the data). In certain aspects, the apparatus is configured to transmit, to a network node, a scheduling request (SR) comprising an indication of a size of the generated data, wherein the indication of the size of the generated data is configured to indicate whether the size of the generated data is greater than or equal to a threshold value, or less than or equal to the threshold value.