Inter-Cell Beam Switching Using Unified TCI State Signaling
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Solution Overview
Problem
Current inter-cell beam management in 5G/NR communication systems face challenges in efficiently handling cell switching due to increased beam management complexity and overhead, particularly with Layer 3 signaling, which hinders seamless mobility and efficient resource allocation.
Innovation Solution
Implementing a unified TCI framework for cross-carrier beam indication using Layer 1 and Layer 2 signaling to facilitate cell switching based on beam management procedures, including timing mechanisms for TCI state applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Layer 3 signaling is used for cell switching, then cell switching can be achieved, but beam management complexity and overhead increase
Solution Approach 1:
The patent extracts the beam management function from Layer 3 signaling and implements it through Layer 1 (TCI state indications) and Layer 2 (MAC CE) signaling separately. This separation reduces the complexity burden on Layer 3 by offloading beam-specific control to lower layers, thereby maintaining cell switching capability while reducing overall beam management complexity.
Solution Approach 2:
The patent segments the cell switching procedure into distinct phases: beam indication via TCI states at Layer 1, beam activation via MAC CE at Layer 2, and cell switching execution at Layer 3. This segmentation allows each layer to handle specific aspects of beam management independently, reducing the complexity overhead that would result from unified Layer 3 handling.
2Reliability
If traditional cell switching procedures are used, then cell switching can be performed, but switching time and resource allocation efficiency are reduced
Solution Approach 1:
The patent applies preliminary action by pre-configuring TCI states that indicate beam directions for potential target cells before actual cell switching occurs. The UE receives and stores multiple TCI state indications in advance, so when cell switching is needed, the UE can quickly activate the appropriate pre-configured beam without time-consuming beam training or measurement procedures, thereby reducing switching time.
Solution Approach 2:
The patent introduces dynamic beam indication through TCI states that can be rapidly updated via MAC CE signaling. This dynamic mechanism allows the network to adapt beam configurations in real-time based on UE mobility and channel conditions, enabling faster and more efficient cell switching compared to static traditional procedures.
Data Source
AI summary
Methods and apparatuses for methods and apparatuses for facilitating serving cell changes based on signaling related to beam management procedures in a wireless communications network. A user equipment (UE) comprises a transceiver and a processor operably coupled to the transceiver. The transceiver is configured to receive a transmission configuration indicator (TCI) state identifier (ID) associated with a target serving cell, receive a cell switch command, and transmit, in response to reception of the cell switch command, a channel conveying a positive hybrid automatic repeat request acknowledgement (HARQ-ACK). The processor is configured to perform, based on the cell switch command, a cell switch at a time, wherein the time corresponds to a slot that starts after a cell switch application time from a last symbol of the channel conveying the positive HARQ-ACK.