Centralized Pre-emptive SR/BSR Control for 5G IAB Networks

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current 5G integrated access and backhaul networks lack a centralized mechanism to control pre-emptive scheduling requests (SR) and buffer status reports (BSR), leading to inconsistent vendor implementations and potential resource wastage due to premature triggering, which can cause performance issues and inefficiencies.

Innovation Solution

Implementing a centralized control mechanism, such as a message from the gNB-CU-CP to IAB nodes to enable or disable pre-emptive SR/BSR triggering, allowing operators to manage this feature network-wide and prevent resource wastage by ensuring consistent behavior across different vendor nodes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If pre-emptive scheduling requests and buffer status reports are triggered early to reduce latency, then response time is improved, but network resource wastage increases

Engineering Contradiction:

ImprovelatencyVSAvoidresource wastage

Core Design Contradiction:

Loss of timeVSLoss of energy

Solution Approach 1:

The system dynamically adjusts the pre-emptive triggering behavior of scheduling requests and buffer status reports based on real-time network conditions. The gNB-CU-CP receives configuration parameters that enable or disable pre-emptive triggering, allowing the network to adapt between aggressive triggering (for low latency) and conservative triggering (for resource efficiency) depending on current load and service requirements.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The invention changes the operational parameters of IAB nodes by receiving configuration messages from gNB-CU-CP that modify the triggering behavior. The configuration includes parameters that control whether pre-emptive SR/BSR triggering is enabled or disabled, and under what conditions, thereby adjusting system behavior to balance latency reduction against resource consumption.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If vendors implement pre-emptive triggering independently without centralized control, then device autonomy is improved, but network consistency deteriorates

Engineering Contradiction:

Improvevendor implementation flexibilityVSAvoidnetwork behavior consistency

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The system implements a feedback mechanism where IAB nodes report their pre-emptive triggering status and performance metrics to the gNB-CU-CP. The central controller uses this feedback to adjust configuration parameters and ensure consistent network-wide behavior while allowing vendors to implement the feature in their own ways, as long as they comply with the configured parameters.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The gNB-CU-CP acts as an intermediary between the core network and IAB nodes, translating high-level network policies into specific configuration parameters for pre-emptive triggering. This intermediary layer ensures that vendor-specific implementations produce consistent network-wide behavior by enforcing standardized configuration and monitoring through the central controller.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Speed

If pre-emptive triggering is enabled without centralized management, then network responsiveness is improved, but troubleshooting capability deteriorates

Engineering Contradiction:

Improvenetwork responsivenessVSAvoidtroubleshooting capability

Core Design Contradiction:

SpeedVSDifficulty of detecting and measuring

Solution Approach 1:

The invention replaces manual troubleshooting mechanisms with automated monitoring and reporting systems. The gNB-CU-CP collects performance data, triggering statistics, and configuration status from all IAB nodes, enabling remote diagnosis and measurement of pre-emptive triggering behavior without requiring physical access or manual intervention at each node.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS11219051B2Pre-emptive triggering for integrated access and backhaul for 5G or other next generation network

Publication Date: 2022.01.04 AT&T INTELLECTUAL PROPERTY I L P

AI summary

In a 5G network, a pre-emptive scheduling request (SR) and a pre-emptive buffer status report (BSR) can be used to reduce the latency of data transmissions on the upstream of a multi-hop integrated access and backhaul (IAB) network from the user equipment UE to the IAB-donor node. A centralized unit (CU) can uniformly ensure that the pre-emptive SR/BSR feature is turned on or off across the entire IAB network regardless of which vendor provides the IAB nodes. Additionally, a message can be sent from a gNodeB to the CU to the IAB node to indicate whether the pre-emptive SR/BSR triggering feature is turned on or off.