Wireless Beam Recovery via Secondary-Cell Uplink Resource Requests
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Solution Overview
Problem
Existing 5G NR wireless radio link recovery procedures are inadequate for secondary cells (Scells) lacking uplink capabilities, particularly above 6GHz, as they cannot transmit link recovery requests due to the absence of UL channels, limiting robustness and efficiency in high-frequency communications.
Innovation Solution
A wireless radio link recovery procedure is introduced for both primary and secondary cells, involving a two-step process: transmitting a resource request (RQ) message on a PUCCH resource when PUSCH is unavailable, and a beam recovery request message on a PUSCH resource when available, using dedicated RQ and SR messages with priority rules to ensure timely link recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional radio link failure recovery procedures are used, then the system maintains basic connectivity, but the recovery time is excessive and call drops occur during handover
Solution Approach 1:
The patent applies preliminary action by pre-configuring alternative uplink resources and preparing recovery mechanisms before radio link failure occurs. The network node pre-allocates PUCCH resources and configures multiple uplink carriers, so when failure occurs, the UE can immediately switch to pre-prepared resources without waiting for conventional recovery procedures, thus reducing recovery time while maintaining reliability
Solution Approach 2:
The patent implements skipping by bypassing the conventional multi-step radio link failure recovery procedure. Instead of following the standard timeline-based recovery process (T310 timer, RLF indication, re-establishment), the system directly switches to alternative uplink carriers and resumes data transmission, rushing through the recovery process to minimize time loss
2Speed
If alternative uplink carriers are used for recovery, then recovery speed improves, but uplink resource availability must be ensured across multiple carriers
Solution Approach 1:
The patent applies universality by configuring multiple uplink carriers that can all serve as alternative resources for recovery. Each uplink carrier is equipped with PUCCH resources and can function as a backup, making the system multi-functional in terms of uplink paths. This allows the UE to switch to any available carrier, improving recovery speed while the network manages resources centrally to handle complexity
Solution Approach 2:
The patent uses the network node as an intermediary that centrally manages and coordinates multiple uplink carriers. The network node configures, monitors, and controls the alternative uplink resources, acting as a mediator between the UE and the multiple carriers. This central coordination helps manage the complexity of multi-carrier resource availability while enabling fast recovery through alternative paths
Data Source
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AI summary
This disclosure relates to wireless radio link recovery methods. In various implementations, the method includes determining a beam failure event for a first cell, and transmitting a beam recovery request message on a shared uplink channel when available. In other implementations, the method includes determining that the shared uplink channel is not available for transmitting the beam recovery request message and transmitting a resource request to request allocation of the shared uplink channel via a second cell.