Terminal Beam Failure Recovery via Dedicated PUCCH Resources
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Solution Overview
Problem
In next-generation radio communication systems, the beam failure recovery (BFR) procedure is not adequately controlled, leading to potential delays and deterioration in system performance due to insufficient reporting operations during beam failure detection and switching to new beams.
Innovation Solution
A terminal equipped with a receiving section for downlink control information using specific RNTI and fields, and a control section that manages the transmission of beam failure information via an uplink shared channel or configured grant based uplink shared channel, enabling appropriate control of the BFR procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the BFR procedure is not appropriately controlled, then the system may operate without dedicated beam failure reporting mechanisms, but this leads to delay in beam failure recovery and deterioration in system performance
Solution Approach 1:
The patent configures dedicated PUCCH resources and RNTIs for beam failure reporting in advance before beam failure occurs. When beam failure is detected, the terminal can immediately use the pre-configured resources to report the failure, eliminating the need for resource allocation delays and enabling instant recovery initiation.
Solution Approach 2:
The patent introduces a dedicated PUCCH resource as an intermediary channel specifically for beam failure reporting. This dedicated resource acts as a mediator between the terminal and base station, providing a reliable and immediate path for beam failure indication without competing with other uplink traffic.
2Loss of time
If dedicated PUCCH resources are configured for beam failure reporting, then reporting timeliness is improved, but device complexity and resource configuration overhead increase
Solution Approach 1:
The patent designs the dedicated PUCCH resource configuration to serve multiple purposes: it can carry both beam failure indication and beam recovery request information, and can be used by multiple terminals simultaneously. This multi-functionality reduces the need for separate dedicated resources for each function, thereby limiting the increase in configuration complexity.
3Loss of information
If multiple reporting steps are used in the BFR procedure, then information completeness is improved, but procedure complexity and processing overhead increase
Solution Approach 1:
The patent combines the beam failure indication and beam recovery request into a single PUCCH reporting step. The terminal transmits both types of information simultaneously on the dedicated PUCCH resource, eliminating the need for separate reporting steps and reducing procedure complexity while maintaining information completeness.
Solution Approach 2:
The patent segments the uplink control information into different fields within the PUCCH transmission, with specific fields dedicated to beam failure indication and other fields for beam recovery request. This segmentation allows complete information transmission in a single step while maintaining clear structure for base station processing.
Data Source
AI summary
One aspect of a terminal in the present disclosure includes a receiving section that receives downlink control information that uses at least one of a specific RNTI (Radio Network Temporary Identifier) and a specific field; and a control section that, when a beam failure is detected, controls transmission of information related to at least one of a cell in which the beam failure is detected and a new candidate beam by using at least one of an uplink shared channel scheduled in the downlink control information and a configured grant based uplink shared channel configured after receiving the downlink control information.