Beam Failure Recovery Response Transmission via Associated Serving Cells
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Solution Overview
Problem
In millimeter wave communication systems, beam failure in high-frequency bands leads to unreliable reception of downlink control information due to blockage, resulting in decreased reception performance, increased scheduling delay, and reduced user experience, with existing beam failure recovery mechanisms being inefficient for secondary serving cells.
Innovation Solution
A method and system for transmitting and monitoring beam failure recovery responses on secondary serving cells associated with the primary serving cell, enhancing the probability of successful detection and reducing the time delay in the beam failure recovery process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam failure recovery response is transmitted only on the primary serving cell, then the transmission mechanism is simple, but the detection probability decreases and time delay increases when the primary cell experiences beam failure
Solution Approach 1:
The patent introduces associated serving cells as intermediary transmission channels for beam failure recovery responses. When the primary serving cell experiences beam failure, the recovery response can be transmitted through alternative associated cells, ensuring reliable delivery without requiring complex multi-path routing protocols.
Solution Approach 2:
The patent extends the transmission dimension from a single primary cell to multiple associated serving cells in the frequency domain. By configuring multiple serving cells with different frequency resources, the system creates additional transmission dimensions that increase detection probability while maintaining manageable complexity through standardized configuration procedures.
2Loss of time
If beam failure recovery response is transmitted on multiple associated serving cells, then the detection probability increases, but the system complexity and resource configuration become more complex
Solution Approach 1:
The patent performs preliminary configuration of associated serving cells and their associations with the primary cell before beam failure occurs. The network configures multiple serving cells and establishes their relationships in advance, so that when beam failure happens, the terminal can immediately utilize the pre-configured alternative paths without additional signaling delays.
Solution Approach 2:
The associated serving cells are configured with multi-functionality, serving both as normal data transmission channels and as backup channels for beam failure recovery responses. This universal usage reduces the need for dedicated recovery-only resources and minimizes system complexity while achieving fast recovery.
3Device complexity
If analog beamforming is used in millimeter wave systems, then the hardware complexity and cost are reduced, but the flexibility and coverage reliability decrease due to blockage
Solution Approach 1:
The patent changes the frequency domain parameter by configuring multiple serving cells operating at different frequency resources. When millimeter wave beams are blocked, the system can switch to associated serving cells that may operate on different frequencies or spatial paths, maintaining reliable control channel reception while keeping the analog beamforming hardware simple.
Data Source
AI summary
The present disclosure provides a beam failure recovery response transmission method and monitoring method, a base station and a terminal. The transmission method includes: determining at least one serving cell, from serving cells that have an association relationship with a first serving cell, as a second serving cell; and transmitting a beam failure recovery response for the first serving cell on the second serving cell.