Beam Failure Recovery Cell Restrictions for Reliable Reporting
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Solution Overview
Problem
There is a need for improved techniques in wireless communication systems, particularly in NR and LTE, to enhance beam failure reporting and recovery processes to support increasing mobile broadband access demands.
Innovation Solution
The method involves detecting a threshold number of beam failures, identifying a candidate beam for recovery, transmitting a beam failure recovery request, receiving a response based on a restriction rule, and resuming communications with the identified candidate beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam failure recovery procedures are implemented without cell restriction rules, then beam failure recovery capability is provided, but unnecessary BFR responses may be received from cells that do not support the candidate beam, reducing communication reliability
Solution Approach 1:
The network entity pre-configures cell restriction rules that identify which cells are authorized to provide BFR responses for specific candidate beams. The UE applies these pre-established rules when selecting cells to monitor for BFR responses, preventing unnecessary monitoring of cells that cannot support the candidate beam and improving recovery reliability.
Solution Approach 2:
Different cells are assigned different roles and capabilities in the BFR process through cell restriction rules. Each cell is configured with specific information about which candidate beams it can support, allowing the UE to selectively monitor only those cells that are locally capable of providing valid BFR responses for identified candidate beams.
2Productivity
If the UE monitors all cells for BFR responses, then comprehensive beam failure recovery options are available, but unnecessary processing and time consumption occur
Solution Approach 1:
The UE extracts and applies cell restriction rules to identify and exclude cells that cannot provide valid BFR responses. By removing unnecessary cells from the monitoring list, the UE reduces processing overhead and time consumption while maintaining access to all necessary recovery options through the restricted cell set.
Solution Approach 2:
Instead of monitoring all cells, the UE performs partial monitoring limited to cells identified by cell restriction rules as capable of supporting the candidate beam. This partial action approach avoids excessive processing of irrelevant cells while ensuring all necessary recovery options are covered.
3Reliability
If cell restriction rules are applied to BFR response reception, then communication reliability is improved by preventing unnecessary responses, but the system requires additional configuration and rule management
Solution Approach 1:
The cell restriction rules serve multiple functions: they identify authorized cells for BFR response, define cell roles in the recovery process, and guide UE monitoring behavior. This multi-functionality reduces the need for separate configuration mechanisms while achieving reliable beam failure recovery through a single unified rule set.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for reporting and responding to beam failure events based on a receiving cell restriction rule. An example method includes detecting an occurrence of a threshold number of beam failures for a connection between the UE and a set of cells; identifying a candidate beam for restoring the connection between the UE and the set of cells in response to detecting the occurrence of the threshold number of beam failures; transmitting, to one or more cells in the set of cells, a beam failure recovery (BFR) request including an identification of the candidate beam; receiving, from a cell in the set of cells, a BFR response in response to transmitting the BFR request, wherein the BFR response is received according to a restriction rule; and resuming communications with the set of cells based on the BFR response.