Dynamic TCI State Updates via DCI and MAC-CE Signaling
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G and LTE technologies, face challenges in efficiently updating transmission configuration information (TCI) states and spatial relation information, leading to increased signaling overhead and latency, which affects communication efficiency and reliability.
Innovation Solution
The method involves dynamically updating TCI states and spatial relation information using downlink control information (DCI) or medium access control (MAC) control elements (CE) instead of traditional radio resource control (RRC) signaling, allowing for efficient configuration and adaptation of transmission parameters without increasing UE memory and activation/de-activation signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RRC signaling is used to update TCI states and spatial relation information, then configuration reliability is ensured, but signaling overhead and latency increase
Solution Approach 1:
The patent applies dynamics by enabling TCI states and spatial relation information to be updated through dynamic signaling mechanisms (MAC-CE and DCI) rather than static RRC signaling. This allows the configuration to adapt in real-time to changing channel conditions and beam requirements, reducing latency while maintaining reliability through multiple update pathways.
Solution Approach 2:
The patent segments the configuration update process into two distinct mechanisms: RRC signaling for initial configuration and higher-layer signaling (MAC-CE/DCI) for dynamic updates. This segmentation allows each mechanism to operate in its optimal domain, with RRC providing reliable baseline configuration and faster signaling handling time-critical updates.
2Loss of information
If RRC signaling is used for TCI state configuration, then complete configuration information can be transmitted, but UE memory requirements and activation/de-activation signaling overhead increase
Solution Approach 1:
The patent applies preliminary action by using RRC signaling to pre-configure a set of TCI states and spatial relation information before actual transmission. This allows the complete configuration to be prepared in advance, and then only references or activations of these pre-configured states need to be signaled dynamically, reducing subsequent signaling overhead.
Solution Approach 2:
The patent uses copying by having the UE store pre-configured TCI states and spatial relation information in memory, then referencing these stored configurations through faster signaling mechanisms. Instead of repeatedly transmitting complete configuration data, the system copies references to the pre-configured states, significantly reducing signaling overhead while maintaining information completeness.
3Manufacturing precision
If traditional RRC signaling is used for updating transmission parameters, then configuration accuracy is maintained, but communication efficiency decreases
Solution Approach 1:
The patent applies dynamics by transitioning from static RRC signaling to dynamic MAC-CE and DCI-based updates for TCI states and spatial relation information. This enables real-time adaptation to changing communication conditions, improving efficiency while maintaining accuracy through the structured format of the dynamic signaling fields.
Solution Approach 2:
The patent changes the parameters of the signaling mechanism itself, moving from RRC layer signaling to MAC-CE and DCI layer signaling. This parameter change in the signaling approach reduces latency and improves efficiency while the standardized field formats ensure configuration accuracy is maintained through proper encoding and validation.
Data Source
AI summary
Aspects of the present disclosure relate to wireless communications, and more particularly, to techniques for dynamically updating transmission configuration information (TCI) state and spatial relation information. For example, downlink control information (DCI) or media access control control element (MAC-CE) is used to update a large number of TCI states. As such, high efficiency, such as in terms of low overhead or usage of memory, is achieved with an increase of the upper limit of configured trigger state numbers. The DCI or MAC-CE is used to dynamically update the content in the large number of TCI states.