Downlink Default Beam Switching With Dynamic TCI State Activation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing beam management and transmission configuration for downlink signals, particularly in heterogeneous networks with varying cell sizes and device capabilities, leading to suboptimal performance and increased latency.
Innovation Solution
Implementing a mechanism for dynamic TCI state update in wireless devices and base stations to optimize beam management and transmission configuration based on device capabilities and network conditions, using configuration parameters and MAC CE formats for efficient beam switching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam management is optimized for heterogeneous networks with varying cell sizes and device capabilities, then communication efficiency and reliability are improved, but system complexity and configuration overhead increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting TCI state configurations based on device capabilities and network conditions. The base station modifies transmission configuration parameters including beamforming settings, TCI state indicators, and MAC CE formats to adapt to heterogeneous network environments, thereby improving communication reliability without requiring fundamental system restructuring
Solution Approach 2:
The patent implements dynamics through adaptive beam management where TCI states are updated in real-time based on channel conditions, device mobility, and network traffic. The system transitions from static beam configurations to dynamic adjustments using MAC CE signaling and RRC reconfiguration, allowing the network to respond to changing conditions while maintaining manageable complexity through standardized procedures
2Loss of time
If dynamic TCI state update mechanism is implemented, then latency is reduced and beam switching efficiency is improved, but configuration overhead and signaling complexity increase
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple TCI states and beamforming parameters before they are needed. The base station prepares a set of candidate TCI states and transmits them in advance using RRC signaling, so that when beam switching is required, the UE can quickly activate a pre-prepared state without extensive real-time configuration, thereby reducing latency while managing signaling overhead
Solution Approach 2:
The patent uses MAC CE signaling as an intermediary mechanism to efficiently update TCI states. Instead of direct RRC reconfiguration for every beam switch, the system employs MAC CE formats that carry condensed TCI state information, reducing the signaling overhead compared to full RRC messages while still enabling dynamic beam switching. This intermediary layer bridges the gap between fast beam switching requirements and standardized configuration procedures
Data Source
AI summary
A method comprises receiving, by a wireless device, one or more messages indicating transmission configuration indicator (TCI) states for downlink transmissions, and receiving a medium access control control element (MAC CE) activating a plurality of TCI states of the TCI states. The method comprises receiving downlink control information (DCI) indicating a TCI state from the plurality of TCI states, and receiving, based on a reference signal identified during a random access procedure and before application of the TCI state, one or more downlink signals.