Beam Failure Recovery Request Signaling in 5G PDCCH Systems
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Solution Overview
Problem
In high-frequency band communication systems, partial failures of PDCCH beams go undetected, leading to delayed beam failure recovery as user equipment (UE) only transmits a recovery request when all beams fail, resulting in inadequate recovery mechanisms for partial failures.
Innovation Solution
The UE detects individual PDCCH beam failures and transmits a first beam failure recovery request when a preset range of beams fail, distinguishing it from a second request sent when all beams fail, allowing the base station to initiate timely recovery for partial failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE determines beam failure only when all PDCCH beams fail, then the beam failure recovery mechanism is simple to implement, but the beam failure recovery cannot be performed in time when only parts of the PDCCH beams fail
Solution Approach 1:
The invention segments the beam failure detection into two distinct scenarios: partial beam failure (when the number of failed beams is less than a first threshold) and complete beam failure (when the number of failed beams reaches or exceeds the threshold). This segmentation allows the system to apply different detection and response mechanisms for each scenario, enabling timely recovery for partial failures while maintaining simple operation for complete failures.
Solution Approach 2:
The invention introduces a configurable threshold parameter that determines when beam failure is declared. By adjusting this threshold, the system can balance between early detection (lower threshold) and false alarm reduction (higher threshold). The base station can dynamically configure this parameter based on network conditions, allowing flexible adaptation to different deployment scenarios.
2Loss of time
If the UE transmits beam failure recovery request only when all beams fail, then the uplink signaling overhead is reduced, but the recovery response is delayed for partial failures
Solution Approach 1:
The invention segments the recovery request transmission into two types: partial failure requests (when fewer than threshold beams fail) and complete failure requests (when threshold or more beams fail). This segmentation enables the system to transmit recovery requests for partial failures without causing excessive signaling overhead, as the requests are only generated when actually needed rather than continuously.
Solution Approach 2:
The invention uses the threshold parameter to control when recovery requests are transmitted. By configuring an appropriate threshold, the system balances between transmitting requests early (reducing recovery time) and avoiding excessive transmissions (reducing signaling overhead). The base station can adjust this parameter to optimize the trade-off based on network conditions.
3Adaptability or versatility
If the base station uses a single recovery procedure for all beam failures, then the procedure is simple to implement, but it cannot provide differentiated recovery for partial and complete failures
Solution Approach 1:
The invention segments the recovery procedure into two distinct paths: one for partial beam failure and another for complete beam failure. The base station determines which path to follow based on the beam failure indication received from the UE. This segmentation provides adaptability to handle different failure scenarios appropriately while keeping each individual path relatively simple to implement.
Solution Approach 2:
The invention applies different recovery procedures locally based on the failure scenario. For partial failures, a lighter recovery procedure is applied, while for complete failures, a more comprehensive procedure is used. This local differentiation optimizes the recovery process for each specific situation without requiring the system to implement all possible procedures in all cases.
Data Source
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AI summary
A beam failure recovery request transmission method, reception method, devices, and systems relating to a communication technology field are provided to solve a problem that UE cannot transmit a beam failure recovery request to a base station when UE detects failure of only parts of PDCCH beams, resulting that beam failure cannot be recovered in time. The transmission method performed by UE includes: detecting whether each of all PDCCH beams fails, the all PDCCH beams being configured by base station for UE to monitor; if UE determines that the quantity of failed PDCCH beams is within a preset range greater than 0 and less than a total quantity of all PDCCH beams, transmitting a first beam failure recovery request to base station; if UE determines failure of all PDCCH beams, transmitting a second beam failure recovery request different from the first beam failure recovery request to base station.