PUSCH Default Beam Selection in Multi-Panel NR
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Solution Overview
Problem
In multi-TRP and multi-antenna panel operations, the current scheme for determining the default spatial relation of the physical uplink shared channel (PUSCH) scheduled by DCI format 0_0 is flawed, leading to incorrect TRP alignment, resulting in suboptimal communication efficiency.
Innovation Solution
The proposed solution configures the PUSCH to follow the spatial relation of a specific PUCCH resource from the same UE panel or TRP, using antenna port groups and radio network temporary identifiers (RNTIs) to ensure correct alignment, and allows for selection based on downlink received signal strength and transmission configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the current scheme for determining default spatial relation of PUSCH is used, then the implementation is simple, but the TRP alignment is incorrect leading to suboptimal communication efficiency
Solution Approach 1:
The patent applies local quality by associating different PUCCH resources with different antenna panels and TRPs. Each PUCCH resource is configured with a specific spatial relation corresponding to a particular antenna panel, allowing the system to select the appropriate spatial relation locally based on which panel received the DCI, rather than using a single global spatial relation for all transmissions.
Solution Approach 2:
The patent introduces PUCCH resources as an intermediary to bridge the connection between DCI reception and PUSCH transmission spatial relations. The PUCCH resource acts as a mediator that carries spatial relation information from the network to the UE, enabling the UE to determine the correct PUSCH spatial relation based on which PUCCH resource is associated with the receiving antenna panel.
2Reliability
If multiple antenna panels are used for multi-TRP operation, then the communication reliability is improved, but the complexity of beam management increases
Solution Approach 1:
The patent segments the beam management process by dividing PUCCH resources into different groups, where each group is associated with a specific antenna panel. This segmentation allows independent management of spatial relations for each panel, reducing the overall complexity compared to managing all panels uniformly, while still achieving diverse TRP connections for improved reliability.
Solution Approach 2:
The patent makes the PUCCH resource configuration universal by enabling it to serve multiple functions: it acts as both an uplink control channel resource and a carrier of spatial relation information for PUSCH transmission. This multi-functionality reduces the need for separate signaling mechanisms, thereby managing complexity while supporting multiple antenna panels for enhanced reliability.
3Ease of operation
If the PUSCH follows the spatial relation of PUCCH resource with lowest ID, then the selection rule is simple, but the alignment with scheduling TRP is incorrect
Solution Approach 1:
The patent applies local quality by configuring different spatial relations for different PUCCH resources based on their association with specific antenna panels and TRPs. Instead of using a single spatial relation for all PUCCH resources, each PUCCH resource has a locally optimized spatial relation that corresponds to the antenna panel used for reception, ensuring accurate TRP alignment while maintaining simple selection rules.
Data Source
AI summary
Systems and methods determine a PUSCH default beam in NR with multiple UE antenna panel operation and multiple TRP operation.