Beam Failure Recovery via BWP-Specific CB-RS Configuration
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Solution Overview
Problem
Existing beam failure recovery methods in 5G networks have high configuration/reconfiguration overhead and transmission overhead of candidate beam reference signals (CB-RS), especially due to significant RRC reconfiguration and CB-RS transmission requirements across multiple bandwidth parts (BWP) and serving cells.
Innovation Solution
An electronic device equipped with a transceiver and circuitry that performs beam failure detection, determines new sets of CB-RS, and selects a new beam based on criteria met by the CB-RS, thereby reducing overhead by optimizing CB-RS configuration and transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CB-RS are configured on each BWP of the cell for beam failure recovery, then beam failure recovery capability is improved, but RRC reconfiguration overhead increases significantly
Solution Approach 1:
The patent segments the CB-RS configuration by associating them with specific BWPs rather than configuring them cell-wide. Each BWP can have its own CB-RS set configured independently, allowing the network to provide beam failure recovery capabilities for active BWPs without unnecessarily configuring all possible BWPs, thus reducing RRC reconfiguration overhead while maintaining recovery capability where needed.
Solution Approach 2:
The patent applies local quality by making CB-RS configuration BWP-specific rather than uniform across the entire cell. The network can configure CB-RS only for BWPs that are currently active or relevant for a particular UE, allowing different quality levels of service across different BWPs and reducing overall configuration overhead while maintaining reliability for active BWPs.
2Reliability
If CB-RS are transmitted in each active DL BWP of the cell, then beam failure recovery capability is improved, but CB-RS transmission overhead increases significantly
Solution Approach 1:
The patent segments CB-RS transmission by BWP, allowing the network to transmit CB-RS only in active DL BWPs rather than all configured BWPs. This segmentation enables the network to reduce transmission overhead by omitting CB-RS in inactive BWPs while maintaining beam failure recovery capability in active BWPs where it is actually needed.
Solution Approach 2:
The patent applies partial action by transmitting CB-RS only in the subset of BWPs that are currently active for a UE, rather than transmitting in all configured BWPs. This partial transmission approach reduces the total transmission overhead while still providing comprehensive beam failure recovery capability for the active BWPs, avoiding the excessive action of transmitting in all possible BWPs.
3Adaptability or versatility
If multiple UEs in the cell use different BWPs, then network flexibility is improved, but overall CB-RS configuration and transmission overhead becomes overwhelming
Solution Approach 1:
The patent applies local quality by configuring CB-RS on a per-BWP basis for each UE according to their specific active BWPs. This allows the network to provide customized CB-RS configuration tailored to each UE's current BWP state, enabling network flexibility for different UEs while controlling overall overhead by only configuring what is currently needed for active BWPs rather than all possible BWPs.
Solution Approach 2:
The patent makes CB-RS configuration dynamic by allowing it to change based on which BWPs are currently active for each UE. As UEs switch between different BWPs, the CB-RS configuration dynamically adapts to the current active state, providing network flexibility for mobility and load balancing while reducing overall overhead by only maintaining configuration for currently active BWPs rather than static all-BWP configuration.
4Productivity
If multiple UEs simultaneously have many activated serving cells, then network capacity is improved, but overall CB-RS transmission overhead becomes overwhelming
Solution Approach 1:
The patent segments CB-RS transmission by both cell and BWP, allowing the network to manage CB-RS transmission for multiple UEs with multiple serving cells efficiently. By segmenting at the BWP level within each cell, the network can transmit CB-RS only in active BWPs of active cells for each UE, reducing the overall transmission overhead while still supporting high network capacity through parallel transmissions to multiple UEs in their respective active BWPs.
Solution Approach 2:
The patent applies partial action by transmitting CB-RS only in the subset of BWPs that are currently active across all serving cells for each UE, rather than transmitting in all configured BWPs. This partial transmission approach reduces the overall energy consumption and overhead while still providing sufficient beam failure recovery capability to maintain network capacity, avoiding the excessive action of transmitting in all possible BWPs across all cells.
Data Source
AI summary
An electronic device including a transceiver to communicate with a network; and circuitry. The circuitry is configured to perform beam failure detection on a monitored cell; detect a beam failure on the monitored cell; determine at least one new set of candidate beam reference signals (CB-RSs) from at least one set of CB-RS configured for the device; determine if any CB-RS in the at least one new set of CB-RSs meets a criterion, and in a case that any CB-RS in the at least one new set of CB-RSs meets the criterion: select a beam corresponding to a CB-RS in the new set that meets the criterion as the new beam, and indicate the selected new beam to the network; and in a case that no CB-RS in the new set of CB-RS meets a criterion, indicate to the network that no CB-RS in the new set meets the criterion.