Cross-Cell Beam Failure Recovery Request Transmission
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Solution Overview
Problem
Current beam failure recovery (BFR) solutions are inadequate for user equipment (UE) with multiple serving cells, as they do not effectively manage the transmission of beam failure recovery requests (BFRQ) across cells in scenarios involving carrier aggregation and dual connectivity.
Innovation Solution
A communications method and apparatus that allow a terminal to transmit a BFR request across cells by using a resource from a second serving cell, enabling improved transmission reliability by receiving and transmitting configuration information, association relationships, and responses related to beam quality and frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal uses a single serving cell for BFR request transmission, then the procedure is simple, but transmission reliability is insufficient when beam failure occurs in carrier aggregation or dual connectivity scenarios
Solution Approach 1:
The patent segments the BFR request transmission by separating the request message from the resource selection logic. The terminal divides the multi-cell scenario into independent resource selection units, where each candidate cell's resources are evaluated separately based on beam quality metrics, allowing reliable transmission without overwhelming procedural complexity
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of pre-configured resource associations between cells and beams. This intermediary layer maps beam quality measurements to specific uplink resources in candidate cells, enabling reliable cross-cell BFR transmission without requiring complex real-time resource allocation procedures
2Reliability
If a terminal transmits BFR request in the same cell where beam failure occurs, then resource allocation is simple, but transmission success probability is low
Solution Approach 1:
The patent inverts the traditional approach by not transmitting the BFR request in the failed cell, but rather in a different candidate cell whose resources are selected based on the failed cell's beam quality measurements. This inversion allows the terminal to exploit resources in cells with better beam conditions, significantly improving transmission success probability while maintaining resource flexibility through configurable cell associations
3Reliability
If a terminal performs beam quality measurement and resource selection across multiple cells, then transmission reliability improves, but processing time increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the network with associations between downlink beams and uplink resources across multiple cells before beam failure occurs. When beam failure is detected, the terminal can immediately map the failed beam's quality metrics to pre-identified candidate resources in other cells, avoiding time-consuming real-time resource selection and measurement procedures while maintaining high transmission reliability
Data Source
AI summary
A communications method and apparatus. The communications method includes: transmitting a first request to a network device through a first resource, where the first request is used to request beam failure recovery of a first cell or is used to request system information of the first cell, the first resource is a resource of a second cell, and the first cell and the second cell are serving cells of a same terminal; and receiving a first response corresponding to the first request from the network device. Therefore, when a terminal has a plurality of serving cells, the terminal may transmit a request across cells (or across carriers), to improve transmission reliability.