Beam Failure Recovery MAC-CE for Multi-TRP Wireless Systems
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Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, beam failures can occur due to changes in the radio environment, leading to communication failures between user equipment (UE) and base stations, especially in multi-TRP configurations, where efficient detection and recovery from beam failures are challenging.
Innovation Solution
A method involving beam failure detection and recovery (BFR) using a beam failure recovery (BFR) MAC-CE, which includes information associated with the beam group, is transmitted by the UE to the base station, allowing for per-beam group or cell-level recovery procedures, enhancing communication reliability and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If beam failure recovery procedures are implemented in multi-TRP configurations, then communication reliability is improved, but device complexity and procedure complexity increase
Solution Approach 1:
The patent segments the beam failure recovery procedure into distinct phases: beam failure detection (monitoring reference signals and counting BFI), candidate beam identification (measuring RSRP of candidate beams), and recovery execution (transmitting BFRQ MAC-CE). This segmentation allows each phase to be handled with specific, simplified rules rather than a monolithic complex procedure.
Solution Approach 2:
The patent applies different quality thresholds and monitoring parameters locally to each TRP and beam group. Each TRP has its own reference signal configuration, BFI counter, and candidate beam criteria, allowing independent optimization and simplification for each link rather than requiring global coordination complexity.
2Measurement precision
If per-beam group beam failure detection is implemented, then measurement precision and recovery accuracy are improved, but loss of time and processing overhead increase
Solution Approach 1:
The patent performs preliminary actions by pre-configuring candidate beam lists and reference signal resources before beam failure occurs. The UE continuously measures candidate beams and maintains a ready list of potential recovery options, so when beam failure is detected, the recovery process can immediately proceed without time-consuming searches or measurements.
Solution Approach 2:
The patent implements a streamlined BFRQ transmission process that skips unnecessary intermediate steps. Upon detecting beam failure and identifying a candidate beam, the UE directly transmits the BFRQ MAC-CE on the selected uplink resource without requiring additional confirmation or coordination steps, thereby reducing overall recovery time.
Data Source
AI summary
In accordance with some embodiments, wireless communication for transmission of a beam failure recovery (BFR) MAC-CE is disclosed. A method performed on a user equipment (UE) includes detecting a beam failure of at least one beam of a beam group. The method further comprises triggering a BFR in response to the detection of the beam failure of the at least one beam of the beam group. In addition, the method includes generating a BFR medium access control-control element (MAC-CE) that includes BFR information associated with the beam group. Further, the method comprises transmitting the BFR MAC-CE that includes the BFR information associated with the beam group using a transmission resource.