LBT Sensing Beam Association via TCI and SRI Indications
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Solution Overview
Problem
In wireless networks, there is a challenge in specifying the relationship between transmission beams and sensing beams for performing Listen Before Talk (LBT) based channel access mechanisms, as the gNB is not aware of which sensing beams are applicable at the UE, and existing solutions do not facilitate effective association between these beams.
Innovation Solution
The proposed solutions involve configuring user equipment (UE) to report sensing beams corresponding to UL transmission beams, using TCI or SRI indications, and allowing the gNB to indicate the relationship between transmission and sensing beams, enabling it to determine corresponding sensing beams for LBT, even when beam correspondence is not supported at the UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the gNB does not specify the relationship between transmission beams and sensing beams, then the system maintains simplicity in beam management, but the LBT performance deteriorates due to lack of effective channel sensing association
Solution Approach 1:
The network pre-configures multiple sensing beam configurations and associates them with transmission beams in advance. The UE is configured with multiple sensing beam resource sets that can be activated based on the selected transmission beam, allowing the system to have beam associations ready before LBT is needed, thus improving LBT performance without adding real-time complexity
Solution Approach 2:
The UE autonomously determines the appropriate sensing beam based on the indicated transmission beam and configured associations. When the network indicates a transmission beam (via TCI or SRI), the UE automatically selects the corresponding sensing beam from its configured sets without requiring explicit gNB specification of the sensing beam, thereby maintaining system simplicity while enabling effective LBT
2Adaptability or versatility
If the network configures multiple sensing beam associations with transmission beams, then the adaptability for different LBT scenarios improves, but the device complexity increases due to multiple configuration sets
Solution Approach 1:
The system uses dynamic activation of sensing beam configurations based on the selected transmission beam. Instead of maintaining all sensing beam configurations simultaneously active, the network activates only the relevant sensing beam set corresponding to the indicated transmission beam, allowing high adaptability while managing complexity through selective activation rather than simultaneous maintenance of all configurations
Solution Approach 2:
The same sensing beam configuration structures (sensing beam resource sets, TCI states, SRI indications) serve multiple purposes: they are used for both uplink transmission beam management and for LBT channel sensing. This multi-functionality allows the system to adapt to different LBT scenarios using existing beam management infrastructure, improving versatility without proportionally increasing complexity
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for reporting sensing beams and association with transmission beams for LBT. An apparatus (300) includes a processor (305) and a memory (310) coupled with the processor (305). The processor (305) is configured to report at least one UL transmission beam and at least one sensing beam that can be used to perform LBT prior to transmitting on the at least one UL transmission beam. The processor (305) is configured to indicate a relationship between the at least one UL transmission beam and the at least one sensing beam via TCI, SRI, beam corresponding, or some combination thereof. The processor (305) is configured to indicate a UL transmission beam via TCI, SRI, beam correspondence, or some combination thereof and determine a corresponding at least one sensing beam to perform LBT.