Mechanisms for radio link failure (RLF) reporting to network

US11659422B2 · kind B2 · utility

Assignee

• Apple Inc. · US

Inventors

• Yuqin Chen · Lo Wu, CN
• Yushu Zhang · Beijing, CN
• Fangli Xu · Beijing, CN
• Qiming Li · Beijing, CN
• Chunhai Yao · Beijing, CN
• Gurunadha Rao Kota · Kanchinakote, IN
• Zhibin Wu · Los Altos, US
• Haijing Hu · Beijing, CN
• Dawei Zhang · Saratoga, US
• Panagiotis Botsinis · Munich, DE
• Christian Hofmann · Erlangen, DE
• Sameh M. Eldessoki · Berlin, DE

Key dates

• Filing date: Jun 2, 2021
• Grant date: May 23, 2023
• Expiry date: Jul 2, 2041

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04W24/02
• WIPO field: Digital communication
• WIPO sector: Electrical engineering

Abstract

When a user equipment (UE) encounters a radio link failure condition, the UE may transmit a radio link failure report to a network. The report may include information defining the radio link monitoring (RLM) resources of a current RLM configuration. The information may take the form of a resource bitmap or a list of resource identifiers/indices. The network may use the information (and radio resource management measurements) to determine whether the radio link failure occurred due to misconfiguration of RLM resources for the UE. In cases where the network does not provide RLM configuration, the UE may omit the bitmap (or list), or populate the bitmap with all zeros, or populate the bitmap (or list) according to a currently active Transmission Configuration Indication (TCI) state, which is indicated by downlink control information (DCI).