IAB Node Beam Management for High-Speed Train Mobility
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Solution Overview
Problem
In high-speed train scenarios, synchronous movement of Integrated Access and Backhaul (IAB) nodes leads to mobility interruptions and unnecessary radio transmissions due to beam failure detection and recovery processes, which are not effectively managed by current 3GPP specifications designed for stationary nodes.
Innovation Solution
Establishing a communication link between synchronously moving IAB nodes to share beam management assistance information, allowing the receiving node to decide on the timing for transmitting this information to the serving network node, thereby coordinating beam failure recovery and reducing unnecessary radio transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam failure detection and recovery procedures are executed for each IAB node independently, then each node can maintain its own connection, but mobility interruptions and unnecessary radio transmissions increase due to synchronous movement
Solution Approach 1:
The patent merges the beam failure detection and recovery processes of multiple synchronously moving IAB nodes by establishing communication links between them. When one node detects beam failure, it shares this information with other nodes in the group, allowing them to coordinate their recovery actions and avoid independent beam failure procedures that would cause repeated mobility interruptions.
Solution Approach 2:
The patent implements a feedback mechanism where IAB nodes exchange beam management assistance information about detected beam failures with each other. This feedback loop allows nodes to anticipate and coordinate beam failure recovery actions, reducing the frequency and duration of mobility interruptions caused by independent detection and recovery procedures.
2Reliability
If beam failure recovery procedures are executed frequently, then connection reliability is maintained, but unnecessary radio transmissions increase consuming more energy and resources
Solution Approach 1:
The patent combines beam failure recovery actions across multiple IAB nodes by enabling them to share beam management information. When one node detects beam failure, other nodes receive this information and can coordinate their recovery procedures, preventing each node from independently executing separate recovery transmissions that would waste energy and radio resources.
Solution Approach 2:
The patent enables IAB nodes to exchange beam management assistance information in advance before beam failure actually occurs. By sharing predictions and early detection information about potential beam failures, nodes can prepare coordinated recovery actions, reducing the need for frequent reactive transmissions and thereby conserving energy and radio resources.
3Ease of manufacture
If current 3GPP specifications are used for stationary nodes, then implementation is simple, but they cannot effectively manage beam failures in high-speed synchronous mobility scenarios
Solution Approach 1:
The patent introduces dynamic behavior to the beam failure management system by enabling IAB nodes to adaptively share beam management assistance information based on their synchronous movement patterns. This dynamic information exchange allows the system to effectively handle high-speed mobility scenarios while building upon the existing 3GPP specification framework, maintaining implementation feasibility while improving effectiveness.
Data Source
AI summary
For example, a communication link between a first relay node and a second relay node, which are in synchronous movement, is established. Beam management assistance information from the first relay node is received at the second relay node upon an occurrence of beam failure at the first relay node (S801). At the second relay node it is decided about a timing at which the received beam management assistance information is to be transmitted to a serving network node (S802), and the received beam management assistance information is transmitted from the second relay node to the serving network node at the decided timing (S803).