Relay Node Beamforming Determination for Full Duplex IAB
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Solution Overview
Problem
Conventional beamforming techniques in integrated access and backhaul (IAB) systems are inadequate for managing both non-full duplex and full duplex communications, particularly in millimeter wave frequency ranges where increased signal attenuation requires efficient beamforming to overcome path losses.
Innovation Solution
The described techniques involve a relay node determining channel statuses for downlink and uplink beamforming directions, reporting these to a parent node, and receiving grants for resource allocation, allowing for optimal beamforming direction selection and simultaneous transmission and reception in full duplex mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional beamforming techniques are used in IAB systems, then system complexity is reduced, but communication efficiency and capacity deteriorate in full duplex mode
Solution Approach 1:
The beamforming determination process is segmented into distinct phases: channel status determination for different beamforming directions, report generation with mode indications, and grant-based resource allocation. This segmentation allows the relay node to systematically manage full duplex beamforming without overwhelming complexity
Solution Approach 2:
The relay node provides feedback to the parent node by reporting channel statuses for different beamforming directions along with mode indications (non-full duplex or full duplex). This feedback mechanism enables the parent node to make informed beamforming direction selections that optimize communication efficiency while managing system complexity
2Reliability
If beamforming is implemented to overcome path loss in mmW frequencies, then signal transmission quality is improved, but system complexity increases
Solution Approach 1:
The system changes parameters such as beamforming directions, channel status indicators, and mode indications to adapt to mmW frequency characteristics. By adjusting these parameters based on reported channel statuses, the system maintains signal transmission quality without requiring complex adaptive beamforming algorithms
3Productivity
If concurrent transmission and reception is enabled in full duplex mode, then communication capacity is improved, but interference management becomes more difficult
Solution Approach 1:
The relay node dynamically switches between non-full duplex and full duplex modes based on channel conditions and traffic requirements. This dynamic operation allows the system to exploit full duplex capacity when beneficial while avoiding interference issues when conditions are unfavorable
Solution Approach 2:
The parent node acts as an intermediary that coordinates beamforming directions and resource allocation between the relay node's transmission and reception operations. By controlling beamforming directions, the parent node helps manage self-interference while enabling full duplex operation
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A relay node may determine a channel status for each of a plurality of downlink beamforming directions between a parent node and the relay node based at least in part on a downlink beamforming direction between the relay node and a child node. The relay node may transmit a report to the parent node indicating at least a subset of the channel statuses and an indication that a respective downlink beamforming direction of the plurality of downlink beamforming directions corresponds to a respective channel status in the subset of the channel statuses. The relay node may receive a grant from the parent node indicating a first downlink beamforming direction. The relay node may monitor for a downlink transmission from the parent node based at least in part on the grant and the first downlink beamforming direction.