Secondary Cell Beam Failure Recovery via PUCCH
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Solution Overview
Problem
Current wireless communication systems, particularly in the 5G NR system, face challenges in efficiently supporting beam failure recovery requests for secondary cells, leading to high latency and overhead issues due to the reliance on PRACH resources and beam reporting mechanisms.
Innovation Solution
The proposed solution involves transmitting beam failure recovery requests on the Physical Uplink Control Channel (PUCCH) instead of PRACH or beam reporting, allowing for efficient beam failure recovery in secondary cells without substantial latency or overhead, by configuring the PUCCH with specific parameters and using it to convey the request along with other control information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam failure recovery requests are transmitted using PRACH resources or beam reporting mechanisms, then the system can support beam failure recovery in secondary cells, but the latency increases and overhead becomes excessive
Solution Approach 1:
The patent introduces PUCCH (Physical Uplink Control Channel) as an intermediary channel to transmit beam failure recovery requests. Instead of using PRACH (Physical Random Access Channel) or beam reporting mechanisms, the PUCCH serves as a dedicated control channel that can carry beam failure recovery information with lower latency and reduced overhead, thereby resolving the contradiction between reliability and time loss.
2Reliability
If beam failure recovery requests are transmitted using PRACH resources or beam reporting mechanisms, then the system can support beam failure recovery in secondary cells, but the overhead increases substantially
Solution Approach 1:
The patent introduces PUCCH (Physical Uplink Control Channel) as an intermediary channel to transmit beam failure recovery requests. Instead of using PRACH (Physical Random Access Channel) or beam reporting mechanisms, the PUCCH serves as a dedicated control channel that can carry beam failure recovery information with lower latency and reduced overhead, thereby resolving the contradiction between reliability and time loss.
3Loss of time
If beam failure recovery requests are transmitted using PUCCH, then latency and overhead are reduced, but the system complexity increases due to configuration requirements
Solution Approach 1:
The patent applies the universality principle by configuring the PUCCH to serve multiple functions: it can transmit both normal control information and beam failure recovery requests. This multi-functionality reduces the need for separate dedicated channels for beam failure recovery, thereby reducing the overall system complexity despite the advanced configuration requirements.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and apparatuses of processing beam failure of a secondary cell at a terminal device and a network device respectively. In an embodiment of the present disclosure, the terminal device is serviced in a primary cell and a secondary cell on separate beams, and the secondary cell operates in a self-scheduling mode. The method may include transmitting, on an uplink control channel of the primary cell, a beam failure recovery request of the secondary cell, in response to detection of a beam failure in the secondary cell; and receiving a response to the beam failure recovery request of the secondary cell on a downlink control channel of the primary cell, wherein the response is configured to indicate a transmission configuration indication for a subsequent transmission. With embodiments of the present disclosure, a solution for supporting beam failure recovery request in the secondary cell without substantial latency or overhead issues, which makes an efficient beam failure recovery in the secondary cell possible.