Reference Signal Beam State Alignment for Dynamic TCI Switching
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Solution Overview
Problem
The mismatch between dynamically indicated spatial states of downlink reference signals and semi-statically configured configuration information in wireless communication systems, particularly in scenarios where channel reciprocity exists, leads to inefficiencies and increased complexity.
Innovation Solution
A method and device for wireless communications that dynamically update the spatial state of reference signals by aligning the dynamically indicated spatial state with the semi-statically configured configuration information, ensuring consistent matching through transmission configuration state sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a downlink beam indicated by a DCI is not only applicable to a downlink data channel and a downlink control channel, but is also applicable to (part of) a downlink reference signal, and a spatial state of the downlink reference signal will be dynamically updated, then beam switching speed is improved, but a mismatch occurs between the dynamically indicated spatial state and the semi-statically configured configuration information
Solution Approach 1:
The patent applies dynamics by enabling the spatial state of downlink reference signals to be dynamically updated through DCI signaling, allowing the beam indication to adapt rapidly to changing channel conditions. The spatial relation parameter can be dynamically switched between different TCI states based on current channel conditions, improving beam switching speed while maintaining connection to semi-static configuration through predefined TCI state sets.
Solution Approach 2:
The patent changes the parameter of spatial state from static to dynamic by introducing dynamic indication mechanisms. The spatial relation parameter can switch between different TCI states (e.g., from a first TCI state to a second TCI state) based on DCI signaling, allowing the system to adapt the spatial configuration without changing the underlying reference signal resource configuration.
2Reliability
If different beam management mechanisms are adopted for control channel and data channel, then communication reliability is improved, but system complexity and signaling overhead increase
Solution Approach 1:
The patent applies universality by using a unified TCI state indication mechanism that can simultaneously manage spatial relations for multiple channel types (control channels, data channels, and reference signals). The same DCI-based indication method serves multiple functions: indicating spatial relation for PDSCH, PDCCH, and downlink reference signals, thereby reducing system complexity while maintaining communication reliability through consistent beam management.
3Stability of the object's composition
If configuration information of the downlink reference signal is semi-statically configured, then configuration stability is improved, but adaptability to dynamic beam switching decreases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple TCI states and their associated spatial relations through semi-static configuration. This preparation allows the system to rapidly switch between different spatial states when needed, combining the stability of semi-static configuration with the flexibility of dynamic selection. The UE is pre-provided with a set of TCI states that can be dynamically activated based on current channel conditions.
Data Source
AI summary
Method and Device in nodes for wireless communication. A first node receives a first configuration information block, a first signaling and a first reference signal resource. The first configuration information block comprises configuration information of the first reference signal resource; the first signaling indicates a first transmission configuration state; the first configuration information block is used to determine a first transmission configuration state set; the first signaling is used to determine a first time; a second transmission configuration state is used to determine a spatial relation of the first reference signal resource before the first time; a spatial relation of the first reference signal resource is related to whether the first transmission configuration state belongs to the first transmission configuration state set after the first time. The above method ensures that when the beam is dynamically updated, a TCI state of a reference signal constantly matches its configuration information.