Beam Indication Framework for Low-Delay Inter-Cell Mobility
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Solution Overview
Problem
Existing beam indication techniques for inter-cell mobility (ICM) in 5G NR wireless communication systems lack support for non-dedicated signaling from neighbor cells, leading to increased complexity and beam activation delays, and potential ACK/NACK errors during ICM procedures.
Innovation Solution
The apparatus receives and transmits indications of beam-associated TCI states and activation delays based on dedicated or non-dedicated signaling from neighbor cells, enabling efficient communication and reducing errors in ICM procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station indicates TCI state for non-dedicated signaling from neighbor cell, then beam indication completeness is improved, but signaling complexity increases
Solution Approach 1:
The patent segments the beam indication mechanism into two independent parts: (1) TCI state indication for dedicated signaling, and (2) TCI state indication for non-dedicated signaling. This segmentation allows the system to maintain completeness for both signaling types while managing complexity by handling them separately rather than as a unified complex mechanism.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the UE with RRC parameters for the neighbor cell before the actual beam indication. The UE is configured with the neighbor cell's TCI states and beam information in advance through RRC signaling, so when beam indication occurs, the UE already has the necessary parameters ready, reducing real-time processing complexity.
2Reliability
If beam activation delay is extended for ICM procedures, then mobility transition reliability is improved, but communication efficiency deteriorates
Solution Approach 1:
The patent introduces dynamic beam activation delay mechanisms that can be adjusted based on the specific ICM procedure requirements. The system can dynamically extend the activation delay when mobility transition reliability is critical, and reduce it when communication efficiency is prioritized, allowing flexible adaptation to different operational scenarios.
Solution Approach 2:
The patent applies preliminary action by pre-configuring RRC parameters for the neighbor cell before beam indication occurs. This pre-configuration allows the UE to have ready-made parameters for mobility transition, reducing the actual activation delay needed during the critical transition moment while maintaining reliability.
3Speed
If L1 signaling is used for ACK/NACK feedback, then feedback speed is improved, but error rate increases
Solution Approach 1:
The patent implements feedback mechanisms that allow the UE to report beam indication status and ACK/NACK information. The feedback system includes mechanisms for the UE to indicate successful reception and processing of beam indication signaling, enabling the base station to adjust subsequent transmissions based on this feedback while maintaining speed and reliability.
Solution Approach 2:
The patent applies beforehand cushioning by implementing error detection and correction mechanisms in the L1 signaling for ACK/NACK feedback. The system includes redundancy and verification protocols that can detect and correct errors before they affect communication, cushioning against the inherent error rate of high-speed L1 signaling.
Data Source
AI summary
This disclosure provides systems, devices, apparatus, and methods, including computer programs encoded on storage media, for beam indication techniques for ICM. A UE (102) receives (310), from a first network entity (304), an indication of a beam associated with a second network entity (305). The indication of the beam corresponds to at least one of a TCI state associated with non-dedicated signaling from the second network entity (305) or an activation delay time for the beam based on whether the beam corresponds to dedicated signaling from the second network entity (305) to the UE (102) or the non-dedicated signaling from the second network entity (305). The UE (102) attempts to receive a downlink communication from the second network entity (305) based on the indication.