UE Uplink Resource Selection for Multi-TRP Beam Conflicts
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Solution Overview
Problem
In wireless communication systems with multiple TRPs serving a UE, uplink transmission conflicts between uplink data and control information can lead to reception quality degradation or extra delays due to improper beamforming, especially when beams are out of synchronization.
Innovation Solution
A method for determining a target time-frequency resource based on antenna port groups and time-frequency resources to ensure correct transmission of uplink data and control information, avoiding conflicts by using appropriate beamforming vectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple TRPs serve a UE simultaneously to improve robustness and transmission rate, then communication reliability and throughput are improved, but uplink transmission conflicts occur between uplink data and control information leading to reception quality degradation or extra delays
Solution Approach 1:
The patent segments uplink resources by associating different TRPs with different antenna port groups and time-frequency resources. Uplink data and control information are separated into different resource sets based on their corresponding TRPs, preventing conflicts while maintaining simultaneous service from multiple TRPs.
Solution Approach 2:
The patent introduces antenna port groups as an additional dimension for resource differentiation. By mapping uplink data and control information to different antenna port groups associated with different TRPs, the system resolves conflicts in the time-frequency domain by utilizing the antenna port dimension.
2Reliability
If beams from base station and UE are aligned for effective communication, then communication quality is improved, but when beams are out of synchronization due to blocking or UE movement, communication quality greatly declines
Solution Approach 1:
The patent establishes preliminary beam associations between TRPs and antenna port groups before communication conflicts occur. By pre-configuring which antenna port groups correspond to which TRPs and their associated beams, the system prepares beam alignment relationships in advance, enabling faster adaptation when beam synchronization is disrupted.
Solution Approach 2:
The patent implements feedback mechanisms where the UE reports uplink channel quality information for different antenna port groups. Based on this feedback, the base station can adjust beamforming vectors and resource allocations to maintain beam synchronization even when blocking or UE movement occurs.
3Productivity
If uplink data and control information for different TRPs are transmitted on the same physical layer data channel to improve resource utilization, then spectral efficiency is improved, but reception quality of control information decreases due to improper beamforming
Solution Approach 1:
The patent applies local quality differentiation by associating specific antenna port groups with specific TRPs and their corresponding beamforming vectors. Even when uplink data and control information share the same physical layer data channel, they are transmitted with different beamforming characteristics tailored to their respective target TRPs, ensuring each receives optimal beamforming treatment.
Solution Approach 2:
The patent changes the beamforming vector parameter based on the target TRP. By dynamically adjusting the beamforming vector according to which TRP is the target (for data or control information), the system maintains high reception quality for control information while allowing resource sharing, thus preserving spectral efficiency without sacrificing reliability.
Data Source
AI summary
The present disclosure provides method and device in a User Equipment (UE) and a base station used for wireless communication. The UE receives a first signaling indicating a first antenna port group and a first time-frequency resource and a second signaling scheduling a first radio signal and indicating a second antenna port group and a second time-frequency resource. The first radio signal is received based on the second signaling. The UE determines that the first time-frequency resource is the target time-frequency resource when the first time-frequency resource and the second time-frequency resource belong to a common time-frequency resource pool, otherwise determines that the second time-frequency resource is the target time-frequency resource when the first time-frequency resource and the second time-frequency resource belong to different time-frequency resource pools. The UE transmits the first reporting information in the determined target time-frequency resource.