IAB Node Delay Budget Management in Wireless Backhaul
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Solution Overview
Problem
In wireless communication systems, particularly in multi-hop Integrated Access Backhaul (IAB) networks, there is a challenge in managing delay budgets to ensure timely data delivery, as existing solutions lack mechanisms for individual RAN nodes to determine the remaining delay budget, leading to potential delays that exceed specified limits for certain services.
Innovation Solution
The proposed solution involves estimating and measuring the propagation delay and processing time at each IAB node, using Quality of Service (QoS) parameters like packet delay budget (PDB) and precision time protocols (e.g., IEEE 1588) to calculate the remaining delay budget, which is then used by schedulers to optimize resource allocation and meet delay budget requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wireless backhaul is used in multi-hop IAB systems, then network deployment simplicity and cost-effectiveness are improved, but packet delay increases beyond allowed limits for QoS-sensitive services
Solution Approach 1:
The system performs preliminary actions by calculating and communicating delay budgets to each IAB node before data transmission occurs. The donor node determines the total delay budget and distributes remaining delay budget information to intermediate nodes in advance, enabling them to make proactive scheduling decisions to meet delay requirements.
Solution Approach 2:
The system implements feedback mechanisms where the donor node receives information about actual delays experienced at each hop and uses this feedback to adjust delay budget allocations and scheduling decisions, ensuring QoS requirements are met despite varying channel conditions.
2Reliability
If delay budget management is implemented at each IAB node, then packet delivery within delay limits is improved, but system complexity increases
Solution Approach 1:
The donor node acts as an intermediary that performs the complex delay budget calculations and distributes simplified remaining delay budget information to intermediate IAB nodes. This approach maintains reliability by centralizing complex computations while reducing the processing burden on intermediate nodes, thus managing system complexity.
Solution Approach 2:
The overall delay budget management function is segmented into distinct responsibilities: the donor node handles total delay budget calculation and distribution, while intermediate nodes focus on local scheduling decisions based on received remaining delay budget information. This segmentation improves reliability through specialized functions while managing complexity by dividing tasks appropriately.
Data Source
AI summary
A radio network node receives a data block to be transmitted by the radio network node towards a destination node. The data block is received over an upstream wireless backhaul from an upstream radio network node and/or is to be transmitted towards the destination node over a downstream wireless backhaul to a downstream radio network node. The radio network node determines a remaining delay budget that indicates a remaining portion of a delay budget for the data block to reach the destination node. The radio network node makes a decision about how or whether to transmit the data block, based on the remaining delay budget.