Secondary Cell Beam Failure Recovery via Primary Cell Intermediary
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Solution Overview
Problem
Beam failure recovery techniques in wireless communication systems face challenges when primary and secondary cells operate with different beam failure detection reference signals, leading to difficulties in detecting and recovering from secondary cell beam failures.
Innovation Solution
A method where user equipment determines secondary cell beam failures at the medium access control layer, selects candidate beams based on primary cell measurements, and transmits data packets to selected secondary cell candidates, while the network entity receives indications of failures and determines spatial receiving filters for beam failure recovery, using channel state information and reference signal measurements to monitor and report on downlink control channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If beam failure recovery techniques use different beam failure detection reference signals for primary and secondary cells, then each cell can be optimized for its specific conditions, but it becomes difficult to detect and recover from secondary cell beam failures effectively
Solution Approach 1:
The patent introduces the primary cell as an intermediary resource for secondary cell beam failure recovery. When a secondary cell beam failure is detected, the UE uses the primary cell's uplink resources (physical random access channel or physical uplink shared channel) to transmit recovery requests to the network entity, rather than relying solely on secondary cell-specific resources that may be unavailable during beam failure conditions.
Solution Approach 2:
The patent segments the beam failure recovery process into distinct detection and recovery phases with different reference signal requirements. The beam failure detection uses secondary cell-specific reference signals (CSI-RS or SSB), while the recovery phase leverages primary cell resources, allowing each phase to operate with optimized signals appropriate to its specific requirements.
2Adaptability or versatility
If the user equipment transmits multiple types of uplink signals for beam failure recovery, then recovery options are increased, but the system complexity and signal coordination requirements increase
Solution Approach 1:
The patent implements dynamic selection of uplink recovery signals based on current system conditions. The network entity configures multiple possible uplink signal types (contention-free random access preamble, contention-based random access preamble, or scheduled PUSCH transmission), and the UE dynamically selects the appropriate signal type based on which resources are currently available and configured, allowing flexible adaptation without requiring all signal types to be simultaneously coordinated.
Data Source
AI summary
According to a first embodiment, a method may include determining, by a user equipment, that a secondary cell beam failure has occurred at a medium access control layer. The method may further include determining, by the user equipment, one or more other secondary cell candidates based on at least candidate beam measurements of a primary cell. The method may further include transmitting, by the user equipment, one or more data packets related to one or more selected other secondary cell candidates.