Multi-PCell URLLC Design Against Fading and Interference
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Solution Overview
Problem
Existing wireless communication systems face challenges in achieving ultra-reliable and low-latency communications (URLLC) due to the susceptibility of primary serving cells to fading and interference, which can lead to radio link failures, especially in multi-cell environments.
Innovation Solution
User equipment evaluates the signal strength of both the primary cell and secondary cells jointly before connecting, utilizing reference signals from multiple transmission points to enhance reliability in multi-cell communication scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the UE connects to a single PCell in a multi-cell environment, then the connection setup is simplified and RRC management is easier, but the reliability of communication deteriorates due to susceptibility to fading and interference
Solution Approach 1:
The patent combines multiple cells (PCell and SCells) into a unified multi-cell communication system where the UE simultaneously communicates with multiple transmission points. This merging of multiple communication paths resolves the contradiction by maintaining connection simplicity through unified RRC management while improving reliability through diverse signal paths that resist fading and interference on any single cell.
Solution Approach 2:
The patent segments the communication connection into multiple independent cell connections (PCell and multiple SCells). Each cell provides an independent communication path, so if one cell experiences fading or interference, other segments maintain the connection. This segmentation resolves the contradiction by distributing risk across multiple segments while keeping overall connection management coordinated.
2Reliability
If the UE uses reference signals from multiple cells for evaluation, then the reliability of connection selection improves, but the complexity of signal evaluation and measurement increases
Solution Approach 1:
The patent applies universal reference signal structures and evaluation criteria across all cells (PCell and SCells). The same reference signal types and measurement procedures are used for all cells, allowing the UE to evaluate multiple cells using a unified framework. This universality resolves the contradiction by enabling multi-cell evaluation without proportionally increasing complexity, as the same tools and methods apply to each cell.
Solution Approach 2:
The patent performs preliminary evaluation of multiple cells using reference signals before the UE commits to a connection. The UE measures and compares reference signals from PCell and candidate SCells in advance, identifying suitable cells for multi-cell communication before actual data transmission begins. This preliminary action resolves the contradiction by establishing reliable connections through advance evaluation, reducing the need for complex real-time decision-making during operation.
Data Source
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AI summary
Aspects of the present disclosure provide a mechanism for improving reliability in a wireless communication network supporting a multi-cell transmission environment including a primary cell (PCell) and one or more secondary cells (SCells). In some examples, a user equipment (UE) in a connected mode with a PCell for multi-cell communication with the PCell and one or more SCells may utilize link quality measurements on both the PCell and one or more SCells to manage the connection with the PCell. In other examples, one or more SCells may function as a PCell to transmit common control signaling to the UE and/or receive uplink control information from the UE. In other examples, a UE in an idle mode may evaluate the reference signals transmitted from the PCell and one or more potential SCells before deciding whether to connect to the PCell for multi-cell communication.