Integrated Access and Backhaul Timing for Simultaneous Uplink
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Solution Overview
Problem
Existing 5G communication systems face challenges in efficiently managing dual access and backhaul operations in integrated access and backhaul (IAB) nodes due to unidirectional transmission/reception properties, leading to interference and latency issues during simultaneous transmissions.
Innovation Solution
The proposed solution involves aligning slot timings between the distributed unit (DU) and mobile termination (MT) within an IAB node for simultaneous signal transmission in different resources, using a first timing scheme where the transmission timings of the IAB-MT and IAB-DU coincide, thereby reducing interference and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the IAB node performs simultaneous transmission in backhaul uplink and backhaul downlink, then the data transmission efficiency is improved, but interference occurs between the transmitted signals
Solution Approach 1:
The patent segments the transmission resources by dividing the backhaul link into separate uplink and downlink resource sets. The IAB-MT and IAB-DU are configured to transmit in different time-frequency resources, preventing signal interference while maintaining simultaneous operation capability. This resource segmentation allows independent scheduling and management of uplink and downlink transmissions.
Solution Approach 2:
The patent introduces spatial dimension by utilizing different spatial directions for backhaul uplink and downlink transmissions. By configuring different spatial parameters (beam directions, spatial filters) for uplink and downlink, the system enables simultaneous transmissions in different spatial dimensions, thereby improving productivity while minimizing interference through spatial separation.
2Loss of time
If the transmission timing of IAB-MT and IAB-DU is aligned, then the latency is reduced, but the interference cancellation complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the transmission timing alignment between IAB-MT and IAB-DU through higher-layer signaling before actual data transmission. The timing relationship is established in advance, allowing the nodes to synchronize their transmissions without requiring complex real-time coordination or interference cancellation processing during data transmission.
Data Source
AI summary
A method and apparatus for transmitting signals via a backhaul link between a parent integrated access and backhaul (IAB) node and a child IAB node by an IAB node including an integrated access and backhaul mobile termination (IAB-MT) and an integrated access and backhaul distributed unit (IAB-DU) in a wireless communication system are provided. The method includes receiving, from the parent IAB node, signaling information indicating a timing scheme to be applied for the IAB-MT, and in case that the indicated timing scheme is a first timing scheme in which a transmission timing of the IAB MT coincides with a transmission timing of the IAB DU, transmitting a signal in a backhaul uplink to the parent IAB node by the IAB-MT, and transmitting a signal in a backhaul downlink to the child IAB node by the IAB-DU, wherein the transmission timing at which the IAB-MT transmits the signal and the transmission timing at which the IAB-DU transmits the signal are set identically.