Multi-TRP Bandwidth Part Alignment via Primary TRP Coordination
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Solution Overview
Problem
In multi-TRP transmission systems, especially with non-ideal backhaul, the alignment of bandwidth parts (BWPs) used by different Transmission and Reception Points (TRPs) is not effectively managed, leading to operational complexity due to unaligned BWPs when only one PDCCH indicates BWP switching.
Innovation Solution
A method and device that align BWPs on multiple TRPs by switching to a new BWP after a certain period if only one PDCCH indicates a BWP change, and using a default BWP or fallback to single TRP transmission until all TRPs can be aligned, ensuring synchronized communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different PDCCHs are configured for multiple TRPs with independent BWP switching, then each TRP can independently optimize its bandwidth usage, but BWP alignment between TRPs becomes complex and difficult to maintain
Solution Approach 1:
The patent merges the BWP switching control of multiple TRPs by introducing a primary TRP that coordinates BWP switching for all TRPs. When the primary TRP switches BWP, all other TRPs switch to the same BWP simultaneously, ensuring alignment while maintaining independent configuration capability. This combines the flexibility of independent PDCCH configuration with the simplicity of unified BWP management.
Solution Approach 2:
The patent creates equipotentiality in BWP states across all TRPs by ensuring they all operate on the same BWP at any given time. This is achieved through the primary TRP's BWP switching command that synchronizes all TRPs to the same BWP configuration, eliminating BWP misalignment issues while preserving independent PDCCH configurations for each TRP.
2Loss of energy
If BWP switching is indicated by only one PDCCH in multi-TRP transmission, then control signaling is reduced, but BWP alignment across all TRPs cannot be ensured
Solution Approach 1:
The patent gives the primary TRP's PDCCH multi-functionality: it not only controls the primary TRP itself but also serves as the authoritative BWP switching command for all other TRPs. This universal control mechanism reduces overall control signaling while ensuring reliable BWP alignment, as the primary TRP's PDCCH indication becomes the reference for all TRPs' BWP switching actions.
Solution Approach 2:
The system uses the primary TRP's own PDCCH to serve the BWP switching needs of all TRPs. The primary TRP's PDCCH self-service mechanism provides BWP switching indications that automatically apply to all TRPs, reducing the need for separate control signals from each TRP while maintaining alignment through the primary TRP's coordinated control.
3Ease of operation
If BWP alignment is maintained across all TRPs, then operational complexity is reduced, but flexibility in dynamic BWP switching is limited
Solution Approach 1:
The patent introduces dynamic BWP switching flexibility within the framework of BWP alignment by allowing the primary TRP to dynamically switch BWPs, with all other TRPs following suit. This dynamic adjustment capability maintains alignment (simplicity) while enabling flexible adaptation to different traffic conditions and channel states (versatility), as the system can dynamically change BWPs whenever needed while keeping all TRPs synchronized.
Data Source
AI summary
Embodiments of the present disclosure provide method, device and computer readable medium for multi-TRP transmission. In example embodiments, a method implemented at a terminal device is provided. The method comprises, in response to a first bandwidth part (BWP) being configured for first and second Transmission and Reception Points (TRPs) in communication with the terminal device and different Physical Downlink Control Channels (PDCCHs) being configured for the first and second TRPs, receiving, from the first TRP, a first PDCCH in a first slot. The method further comprises, in response to the first PDCCH indicating BWP switching from the first BWP to a second BWP on the first TRP, ensuring BWPs on the first and second TRPs to be aligned. In this way, BWPs for multiple TRPs can be aligned in multi-PDCCH based multi-TRP transmission.