Radio Terminal SR with BSR for Uplink Latency

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Solution Overview

Problem

Current mobile communication systems face challenges in reducing uplink latency, which affects high-speed uplink access and TCP throughput due to inefficient uplink resource allocation and scheduling processes.

Innovation Solution

The introduction of a "SR w/BSR" mechanism, where the radio terminal transmits a scheduling request using a PUCCH resource that includes buffer information, allowing for timely and appropriate allocation of PUSCH resources, thereby omitting the need for a separate buffer status report procedure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a separate buffer status report procedure is implemented, then resource allocation accuracy is improved, but uplink latency increases

Engineering Contradiction:

Improveresource allocation accuracyVSAvoiduplink latency

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent combines the scheduling request (SR) and buffer status report (BSR) into a single uplink transmission. The BSR information is embedded within the SR message structure, allowing the base station to obtain both the scheduling request indication and buffer status information in one reception event, thereby eliminating the separate BSR procedure and reducing uplink latency while maintaining accurate resource allocation

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent enables the radio terminal to transmit buffer status information preliminarily along with the scheduling request, before the base station makes the resource allocation decision. This preliminary provision of buffer information allows the base station to perform accurate resource allocation immediately upon receiving the SR, without waiting for a subsequent BSR transmission

Inventive Principle:

Principle #10Preliminary action

2Loss of energy

If traditional scheduling request mechanism is used, then signaling overhead is reduced, but resource allocation timing is delayed

Engineering Contradiction:

Improvesignaling overheadVSAvoidresource allocation timing

Core Design Contradiction:

Loss of energyVSLoss of time

Solution Approach 1:

The patent merges the BSR functionality into the existing SR message structure rather than creating a completely new message type. This approach provides the timing benefit of including buffer information early in the scheduling process while minimizing the increase in signaling overhead by reusing the established SR message format and adding only the necessary buffer status fields

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS10624069B2Radio terminal, base station, and processor

Publication Date: 2020.04.14 KYOCERA CORP

AI summary

A radio terminal that transmits uplink data to a base station using a PUSCH resource includes a controller configured to execute a process of transmitting a scheduling request for requesting allocation of the PUSCH resource to the base station using a PUCCH resource. The scheduling request includes buffer information indicating an amount of the uplink data in a transmission buffer of the radio terminal.