IAB Node Uplink Congestion Offloading via Auxiliary Paths
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Solution Overview
Problem
Integrated Access and Backhaul (IAB) networks experience long-term uplink congestion, leading to data packet loss and increased waiting times for users, as existing congestion control methods are inadequate in addressing persistent transmission mismatches between ingress and egress link capabilities.
Innovation Solution
An electronic device and wireless communication method that determine long-term congestion conditions in IAB nodes, initiate data offloading on the egress link upon permission from the IAB donor node, thereby improving backhaul capability and alleviating congestion by utilizing auxiliary transmission paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing Backpressure congestion control scheme is used to limit upload rate of sub nodes, then short term congestion is alleviated, but long term congestion problem remains unsolved
Solution Approach 1:
The patent applies preliminary action by proactively detecting long-term congestion conditions through monitoring uplink transmission metrics over a predetermined time period. When congestion is detected, the system preemptively initiates data offloading to auxiliary transmission paths before the congestion severely impacts network performance, rather than merely reacting to acute congestion events as the Backpressure scheme does
Solution Approach 2:
The patent introduces another dimension by adding auxiliary transmission paths (such as wireless side links between IAB nodes) as an additional dimension for data transmission. This allows traffic to be offloaded from the congested wired backhaul link to alternative wireless paths, effectively creating a multi-dimensional transmission architecture that bypasses the single-dimensional bottleneck of the traditional backhaul
2Productivity
If data offloading is performed on egress link, then transmission capability is enhanced and congestion is alleviated, but additional control signaling and complexity are introduced
Solution Approach 1:
The patent implements feedback mechanisms where the IAB node continuously monitors uplink transmission conditions and provides feedback to the donor node about congestion status. The donor node responds by granting or denying offloading permissions based on this feedback, creating a closed-loop control system that dynamically adjusts traffic routing to balance productivity gains with controlled complexity
Solution Approach 2:
The IAB node autonomously performs data offloading to auxiliary transmission paths once permission is granted by the donor node. The node independently manages the offloading process, including selecting appropriate auxiliary paths and routing traffic, thereby reducing the need for continuous donor node intervention and simplifying overall control signaling
Data Source
AI summary
An electronic device, a wireless communication method, and a computer readable storage medium are provided. The electronic device comprises a processing circuit configured to: determine whether uplink transmission of an IAB node satisfies a long-term congestion condition; when it is determined that the long-term congestion condition is satisfied, send an offloading request to an IAB donor node; and perform data offloading of an egress link of the uplink transmission of the IAB node according to offloading license information from the IAB donor node. According to at least one aspect of the embodiments of the present disclosure, when the uplink transmission of the IAB node satisfies the long-term congestion condition, the data offloading of the egress link of the uplink transmission of the IAB node can be performed, so as to improve the backhaul capability of the IAB node, thereby solving the long-term congestion problem of the IAB node.