TCI-Triggered PDCCH Suspension for Inter-Cell Beam Management
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Solution Overview
Problem
In 5G NR systems, user equipment (UE) faces challenges in managing simultaneous reception of control channels from multiple cells due to limited capabilities in antenna panel operation and timing differences, leading to issues with activating TCI states with different physical cell identities, which complicates beam management and increases complexity.
Innovation Solution
Implementing UE monitoring rules for inter-cell beam management, including suspending PDCCH monitoring on one cell when a TCI state is activated for a different cell, using DCI or MAC CE, and configuring a time gap to ignore TCI state changes with different PCIs, to reduce complexity and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the user equipment monitors control channels from multiple cells simultaneously, then the beam management capability is improved, but the device complexity and processing load increase
Solution Approach 1:
The patent implements dynamic switching of control channel monitoring between different cells based on TCI state activations. The UE adapts its monitoring behavior in real-time, suspending monitoring on one cell when a TCI state associated with another cell is activated, and resuming when deactivated. This dynamic approach allows the system to maintain multi-cell beam management capability while reducing instantaneous processing complexity.
2Adaptability or versatility
If the user equipment activates TCI states with different physical cell identifiers, then the inter-cell beam management flexibility is improved, but the timing synchronization and operation reliability deteriorate
Solution Approach 1:
The patent implements preliminary suspension of control channel monitoring on a first cell before a TCI state associated with a second cell is fully activated. By proactively suspending monitoring in advance of potential timing conflicts, the system prevents synchronization issues from occurring, thereby maintaining reliability while enabling flexible inter-cell beam management.
3Reliability
If the user equipment monitors control channels from multiple cells, then the beam diversity is improved, but the signaling overhead and processing latency increase
Solution Approach 1:
The patent implements periodic resumption of control channel monitoring based on TCI state deactivation events. Instead of continuously monitoring all cells simultaneously, the UE periodically activates monitoring on the first cell when the second cell's TCI state is deactivated, maintaining beam diversity while reducing average processing latency and signaling overhead.
Data Source
AI summary
Methods and apparatus, including computer program products, are provided for control channel monitoring. In some example embodiments, there may be provided a method that includes receiving, at user equipment, an indication of a codepoint activation, wherein the codepoint activation indicates that a transmission configuration indicator state being activated is associated with a second physical cell identifier different from a first physical cell identifier of a serving cell of the user equipment, and in response to the transmission configuration indicator state being activated in association with the second physical cell identifier, suspending control channel monitoring of at least one set of core resources associated with the first physical cell identifier of the serving cell of the user equipment. Related systems, methods, and articles of manufacture are also disclosed.