MAC Layer BSR-SR Triggering Mechanism for Uplink Resource Efficiency

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Solution Overview

Problem

In LTE wireless communication systems, the current buffer status report (BSR) and scheduling request (SR) mechanisms lead to unnecessary triggering, wasting allocated resources, premature SRs, and starvation of lower priority data due to inadequate consideration of already allocated UL grants and semi-persistent scheduling (SPS) resources, resulting in inefficient use of uplink resources, especially in time-critical applications.

Innovation Solution

A method and device for a MAC layer in user equipment that uses threshold-based decision-making to determine when to trigger BSR-SR, considering the state of SPS resource configuration, data type, and the size of data in the transmission buffer, synchronizing SPS data delivery with SPS resource arrival, and ensuring that lower priority data is not starved by maintaining SRs, thereby optimizing resource utilization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the current BSR-SR triggering mechanism is used without considering allocated UL grants and SPS resources, then the UE can simply trigger SR when data arrives, but this causes unnecessary triggering and wastes allocated resources

Engineering Contradiction:
Improvesimplicity of BSR-SR triggeringVSAvoidwaste of allocated UL resources
Core Design Contradiction:
Ease of operationVSLoss of energy

Solution Approach 1:

The patent applies preliminary action by having the UE check whether SPS resources are allocated before triggering BSR-SR. The UE determines in advance if SPS resources cover the current and future TTIs, and only triggers BSR-SR if necessary, avoiding unnecessary resource waste while maintaining simple triggering logic when conditions are met.

Inventive Principle:
Principle #10Preliminary action

2Speed

If the UE triggers SR immediately when data arrives without considering future SPS resources, then the response time is minimized, but this causes premature SR triggering and resource waste

Engineering Contradiction:
Improveresponse speed of SR triggeringVSAvoidtime gap between data arrival and actual transmission
Core Design Contradiction:
SpeedVSLoss of time

Solution Approach 1:

The patent applies preliminary action by having the UE check whether SPS resources are allocated before triggering BSR-SR. The UE determines in advance if SPS resources cover the current and future TTIs, and only triggers BSR-SR if necessary, avoiding unnecessary resource waste while maintaining simple triggering logic when conditions are met.

Inventive Principle:
Principle #10Preliminary action

3Productivity

If the UE cancels pending SR when new UL resources are available, then resource utilization is optimized, but this causes starvation of lower priority data

Engineering Contradiction:
Improveresource utilization efficiencyVSAvoidtransmission reliability of lower priority data
Core Design Contradiction:
ProductivityVSReliability

Solution Approach 1:

The patent applies preliminary action by having the UE check whether SPS resources are allocated before triggering BSR-SR. The UE determines in advance if SPS resources cover the current and future TTIs, and only triggers BSR-SR if necessary, avoiding unnecessary resource waste while maintaining simple triggering logic when conditions are met.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent applies feedback by having the UE report buffer status information to the eNB, which then makes informed scheduling decisions. The eNB uses this feedback to determine whether to allocate resources for lower priority data, ensuring that resource cancellation does not starve lower priority data while still optimizing overall resource utilization.

Inventive Principle:
Principle #23Feedback

4Device complexity

If the UE uses simple threshold-based triggering without considering SPS configuration, then the decision logic is simplified, but this results in premature SR triggering and resource waste

Engineering Contradiction:
Improvecomplexity of triggering decision logicVSAvoidwaste of allocated UL resources
Core Design Contradiction:
Device complexityVSLoss of energy

Solution Approach 1:

The patent applies preliminary action by having the UE check whether SPS resources are allocated before triggering BSR-SR. The UE determines in advance if SPS resources cover the current and future TTIs, and only triggers BSR-SR if necessary, avoiding unnecessary resource waste while maintaining simple triggering logic when conditions are met.

Inventive Principle:
Principle #10Preliminary action

Data Source

PatentUS9167594B2Method and related device of a trigger mechanism of buffer status report and scheduling request in a wireless communication system
Publication Date: 2015.10.20 HTC CORP
  • US9167594B2 patent drawing
  • US9167594B2 patent drawing
  • US9167594B2 patent drawing

AI summary

A method of a trigger mechanism of buffer status report (BSR) and scheduling request (SR) for a media access control layer of a user equipment in a wireless communication system, the method including receiving a first data, identifying a state of semi-persistent scheduling (SPS) resource configuration and a type of the first data when the first data arrives at a transmission buffer and deciding a state of a BSR-SR triggering according to the state of SPS resource configuration, the type of the first data and a comparison between a size of a second data in the transmission buffer and a threshold.