Joint TCI State Activation for 5G Beam Adaptability
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G NR, face challenges in optimizing beam operations for efficient data transmission and reception, leading to suboptimal performance in scenarios requiring high reliability and low latency, such as URLLC and mMTC.
Innovation Solution
The method involves a user equipment (UE) that receives RRC configurations for different TCI states and activates specific TCI state combinations, mapping them to codepoints in DCI for controlling PDSCH scheduling, and transmitting HARQ-ACK bits to apply the appropriate TCI states for transmission or reception, enabling flexible beam operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple TCI states are configured for beam operations, then beam adaptability is improved, but system complexity increases
Solution Approach 1:
The patent segments TCI states into different sets (first set for downlink, second set for uplink, third set for both) and uses separate activation mechanisms for each set. This segmentation allows the system to manage multiple TCI states without overwhelming complexity, as each set can be independently configured and activated based on specific operational needs.
Solution Approach 2:
The patent implements dynamic beam operation by allowing the network to activate different TCI state combinations via MAC CE commands based on current channel conditions and traffic requirements. The UE dynamically switches between different TCI state combinations, enabling adaptive beam management that responds to changing environmental conditions while maintaining system manageability.
2Reliability
If dynamic beam switching is implemented, then transmission reliability is improved, but processing time increases
Solution Approach 1:
The patent pre-configures multiple TCI states and their corresponding beam parameters through RRC signaling before actual transmission occurs. This preliminary configuration allows the UE to have ready-to-use beam parameters stored, so when the network triggers a beam switch via MAC CE, the UE can quickly apply the pre-prepared parameters without extensive real-time processing, thus reducing switching time while maintaining reliability.
Solution Approach 2:
The patent introduces MAC CE as an intermediary mechanism between RRC configuration and actual beam application. The MAC CE carries activation commands that trigger pre-configured TCI state combinations, acting as a fast signaling layer that bridges the gap between slow RRC configuration and immediate beam switching requirements, enabling reliable beam management with minimized processing delay.
3Adaptability or versatility
If multiple TCI state combinations are activated, then scheduling flexibility is improved, but control overhead increases
Solution Approach 1:
The patent merges multiple TCI states into TCI state combinations, where each combination represents a pre-packaged set of beam parameters for specific scenarios. Instead of managing individual TCI states separately, the system combines them into unified combinations that can be activated with a single MAC CE command, reducing control overhead while maintaining the ability to support multiple beam configurations for enhanced scheduling flexibility.
Solution Approach 2:
The patent creates universal TCI state combinations that can serve multiple purposes - the first combination for downlink optimization, the second for uplink, and the third for both. This multi-functionality allows a single activation command to handle diverse scheduling scenarios, reducing the need for separate control signals for each scenario and thereby minimizing control overhead while preserving scheduling flexibility.
Data Source
AI summary
A method performed by a user equipment for a beam operation is provided. The method includes: receiving an RRC configuration for configuring a set of joint TCI states; receiving, from the BS, a MAC CE for activating a subset of joint TCI states in the set of joint TCI states, the MAC CE is used to map the subset of joint TCI states to codepoints of a TCI field in DCI; receiving the DCI indicating a joint TCI state included in the subset of joint TCI states activated by the MAC CE; determining whether the DCI includes a DL assignment; transmitting, in response to reception of the DCI, first HARQ-ACK information in a case that the DCI does not include the DL assignment; and transmitting, in response to the reception of the DCI and reception of a PDSCH, second HARQ-ACK information in a case that the DCI includes the DL assignment.