MAC CE for Multi-Beam TCI State Updates
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently updating Transmission Configuration Indication (TCI) states and spatial relations for multiple Component Carriers (CCs), leading to increased messaging overhead and latency, especially in multi-Transmission Reception Point (TRP) scenarios.
Innovation Solution
The use of Medium Access Control Control Elements (MAC CEs) to update TCI states and spatial relations for a list of CCs, allowing for simultaneous updates and reducing the number of control messages required, thereby minimizing overhead and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate control messages are used to update TCI states for each Component Carrier, then each CC can be updated individually, but the messaging overhead and latency increase significantly
Solution Approach 1:
The patent combines multiple TCI state update commands for different Component Carriers into a single MAC CE message. The MAC CE includes a list of serving cell IDs and corresponding TCI state indications, allowing the network to update TCI states across multiple CCs simultaneously through one control message rather than sending separate messages for each CC.
Solution Approach 2:
The MAC CE structure is designed to handle multiple CCs universally by including a flexible list of serving cell IDs and corresponding TCI state information. This multi-functional control message can update TCI states for any number of CCs depending on the configuration, making the system more efficient without sacrificing individual CC update capability.
2Adaptability or versatility
If separate control messages are sent for each CC TCI state update, then individual CC control is maintained, but the number of control messages increases
Solution Approach 1:
Multiple individual control messages are merged into a single MAC CE that carries TCI state updates for multiple CCs. The MAC CE structure includes a list of serving cell IDs paired with their corresponding TCI state indications, consolidating what would otherwise require multiple separate messages into one unified control element.
Solution Approach 2:
The MAC CE is segmented into multiple fields, each containing a serving cell ID and its corresponding TCI state information. This segmentation allows the single control message to be parsed and applied to individual CCs separately, maintaining per-CC control flexibility while reducing the total number of messages transmitted.
3Measurement precision
If individual MAC CEs are used for each CC spatial relation update, then precise control is achieved, but the messaging overhead increases
Solution Approach 1:
The patent merges spatial relation update commands for multiple CCs into a single MAC CE message. The MAC CE contains a list of serving cell IDs paired with spatial relation information, allowing the network to update spatial relations across multiple CCs simultaneously. This reduces the number of transmissions required and lowers the overall messaging overhead in the system.
Data Source
AI summary
Some aspects include an apparatus, method, and computer program product for facilitating control messaging for multi-beam communications in 5G wireless communication systems. Nodes of a 5G network may be generate Medium Access Control Control Elements (MAC CEs) to update User Equipment (UE) with different Component Carrier (CC) settings. The MAC CEs may update a list of CCs to reduce messaging overhead and latency. For example, a MAC CE may indicate an update for a Transmission Configuration Indication (TCI) state for a list of CCs. Similarly, a MAC CE may be used to update a spatial relation for a Sounding Reference Signal (SRS) resource set and/or a SRS resource corresponding to a list of CCs. A MAC CE may also be used to update multiple TCI codepoints having one or two TCI states in a multi-Transmission Reception Point (multi-TRP) scenario.