Wireless Retransmission Routing Around Congested IAB Relay Nodes
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Solution Overview
Problem
In integrated access and backhaul (IAB) networks, heavily-loaded nodes experience high scheduling delays and spectrum underutilization due to failed message transmissions, especially in multi-hop scenarios with stationary CPEs, leading to increased retransmissions and low network diversity.
Innovation Solution
A node in the wireless communication system requests re-transmissions directly from a farther node via a direct backhaul or access channel, bypassing the adjacent node's involvement, and utilizes temporarily inactive time periods for retransmissions, reducing load and buffer requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If retransmissions are performed through heavily-loaded adjacent nodes in multi-hop IAB networks, then message delivery reliability is improved, but scheduling delays increase and spectrum utilization deteriorates
Solution Approach 1:
The patent introduces a direct communication path between the transmitting node and the destination node, bypassing the heavily-loaded intermediate relay node for retransmissions. This mediator approach allows the system to maintain reliability through retransmissions while avoiding the scheduling delays caused by congested intermediate nodes.
Solution Approach 2:
The patent segments the retransmission path from the original relay path. Instead of using the same heavily-loaded intermediate node for both initial transmission and retransmission, the system creates a separate direct path for retransmissions, thereby isolating the retransmission traffic from the congested relay node.
2Reliability
If multiple retransmissions are performed at heavily-loaded nodes, then message delivery reliability is improved, but spectrum utilization deteriorates
Solution Approach 1:
The direct communication path acts as an intermediary channel that bypasses the congested spectrum resources at the heavily-loaded intermediate node. Retransmissions occur over this alternative path, maintaining reliability while preserving spectrum utilization at the overloaded node.
Solution Approach 2:
The patent introduces a new dimensional path for retransmissions - a direct link that exists in a different topological dimension compared to the multi-hop relay path. This dimensional change allows the system to achieve retransmissions without competing for the same spectrum resources at the congested intermediate node.
3Loss of time
If direct communication paths are established between all node pairs for retransmissions, then scheduling delays are reduced, but device complexity increases
Solution Approach 1:
The patent applies direct communication paths selectively - only when the destination node can directly receive from the transmitting node, rather than establishing universal direct paths between all node pairs. This local quality approach reduces complexity by implementing the feature only where it provides benefit.
Solution Approach 2:
The system implements partial direct communication capability - not all nodes have full direct connectivity, but enough nodes have direct paths available to handle retransmissions effectively. This partial action approach achieves the timing benefits without requiring the excessive complexity of complete direct connectivity between all nodes.
Data Source
AI summary
The present disclosure relates to a node (AP2, U11) in a wireless communication system (1), where the node (AP2, U11) is adapted to communicate with at least two other nodes (AP1, AP0) in the wireless communication system (1), and where the other nodes (AP1, AP0) are first type nodes (AP1, AP0) which are adapted to communicate with each other by means of backhaul communication. The node (AP2, U11) is adapted to receive a signal (xA) transmitted from an adjacent first type node (AP1), where the (xA) has been forwarded from at least one farther first type node (AP0). In case of unsuccessful decoding of the signal (xA), the node (AP2, U11) is adapted to request re-transmission (NACK) of the signal (xA), and to receive a re-transmission of the signal (xA) directly from a farther first type node (AP0).