Wireless Node TCI State Alignment for Beam Handover
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Solution Overview
Problem
In wireless communication systems, particularly in NR R15 and R16, there is a mismatch between dynamically indicated spatial relations of downlink reference signals and semi-persistently configured configuration information, leading to communication quality degradation and potential failure due to UE mobility and other factors.
Innovation Solution
A method is introduced where a unified solution for various scenarios, including cellular networks and V2X, dynamically updates the spatial relation of downlink reference signals to match their configuration information, using CSI reporting with multiple resource configurations and dynamically indicated transmission configuration states to ensure alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If downlink reference signals use semi-persistently configured configuration information, then system complexity is reduced, but spatial relation mismatch occurs due to UE mobility leading to communication quality degradation
Solution Approach 1:
The patent applies dynamics by enabling the spatial relation of downlink reference signals to be dynamically updated through MAC CE signaling or physical layer signaling, rather than remaining static with semi-persistent configuration. This allows the spatial relation to adapt to UE mobility and maintain alignment with the actual beam direction, resolving the contradiction between system complexity and communication quality.
Solution Approach 2:
The patent changes the parameter of spatial relation from static to dynamic by introducing mechanisms to update it. The spatial relation parameter can be modified through MAC CE activation or physical layer signaling, allowing the system to maintain accurate spatial alignment without permanently increasing system complexity.
2Reliability
If downlink reference signals dynamically update spatial relation, then communication quality is maintained, but configuration information mismatch occurs between dynamic spatial relation and semi-persistent configuration
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple resource configurations (first resource configuration, second resource configuration, etc.) with different spatial relations before needing to switch between them. When UE mobility requires a spatial relation update, the system can activate a pre-configured resource configuration that matches the new beam direction, avoiding configuration information mismatch.
Solution Approach 2:
The patent introduces MAC CE signaling and physical layer signaling as intermediaries between the static semi-persistent configuration and the dynamic spatial requirements. These intermediaries carry activation commands that switch between pre-configured resource configurations, ensuring consistent configuration information while enabling dynamic spatial relation updates.
3Reliability
If multiple resource configurations are maintained for different spatial relations, then spatial relation alignment is ensured, but signaling overhead increases
Solution Approach 1:
The patent segments the resource configuration into multiple independent configurations (first resource configuration, second resource configuration, etc.), each associated with a specific spatial relation. This segmentation allows the system to maintain multiple spatial relations without creating one monolithic complex configuration, reducing signaling overhead by allowing selective activation of only the needed segments.
Solution Approach 2:
The patent enables the system to discard (deactivate) resource configurations that are no longer needed and recover (reactivate) them when required. This reduces signaling overhead by maintaining a pool of pre-configured options that can be quickly activated or deactivated based on current spatial requirements, rather than continuously signaling all configuration parameters.
Data Source
AI summary
The present disclosure provides a method and a device in a node used for wireless communications. A first node receives a first reporting configuration and a first signaling; and transmits a first information block. The first signaling indicates a first transmission configuration state; the first information block comprises a reporting for the first reporting configuration; the first reporting configuration comprises N resource configurations; the N resource configurations respectively correspond to N first-type indexes; the first transmission configuration state corresponds to a first index; the first index is used to determine a first resource configuration; a measurement on reference signal resource(s) only in the first resource configuration among the N resource configurations is used to generate the first information block. The above method ensures that a TCI state of reference signals constantly matches with configuration information with the beams being dynamically updated.