Bandwidth Part Switching for Multi-DCI Multi-TRP Operation
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Solution Overview
Problem
In wireless communication systems with multiple TRPs, existing technologies struggle to manage bandwidth part (BWP) switching effectively when multiple DCIs are received from different TRPs, especially in scenarios with ideal and non-ideal backhaul, leading to unclear UE behavior and potential misalignment in BWP changes.
Innovation Solution
A receiver and processor system that detects multiple DCIs with BWP indicators, determining if any indicate a change from the current BWP, and configures the receiver and transmitter to perform the necessary BWP switch, handling both ideal and non-ideal backhaul scenarios through coordinated and timer-based approaches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple DCIs are received from different TRPs in a slot, then the UE can receive more downlink control information and support multi-TRP transmission, but the UE behavior becomes unclear and BWP changes may become misaligned
Solution Approach 1:
The patent applies parameter changes by prioritizing DCIs based on their reception timing (time parameter) and associated BWP switching parameters. When multiple DCIs are received, the UE changes the operational parameters by selecting one DCI as primary based on timing criteria, thereby resolving the behavior ambiguity while maintaining multi-TRP support
Solution Approach 2:
Instead of requiring the UE to process all received DCIs equally, the patent inverts the approach by having the UE selectively process only the prioritized DCI for BWP switching decisions. This inversion transforms the problem from handling multiple conflicting indications to handling a single decisive indication selected through prioritization rules
2Adaptability or versatility
If BWP switching is performed based on multiple DCIs with different BWP indicators, then the UE can adapt to different TRP requirements, but the BWP change timing and coordination becomes complex
Solution Approach 1:
The patent resolves BWP coordination complexity by changing the decision parameter from considering all DCIs to considering only the prioritized DCI. The BWP switching parameters (target BWP, timing) are determined solely based on the selected DCI, simplifying the coordination mechanism while preserving the ability to adapt to different TRP requirements through the prioritization logic
3Adaptability or versatility
If the UE follows BWP change indications from all received DCIs, then all TRP requirements are met, but the UE cannot maintain a single active BWP as required by the system
Solution Approach 1:
The patent inverts the problem by not attempting to follow all BWP indications simultaneously, but rather by selecting one DCI whose BWP indication will be followed. This inversion maintains the single active BWP constraint while still providing adaptability to different TRPs through the DCI prioritization mechanism that selects the most appropriate BWP indication
Data Source
AI summary
Apparatus and methods of bandwidth part (BWP) operation for multiple downlink control information (DCI) based multiple transmit receive points (TRP) transmission are disclosed. The apparatus includes: a receiver that receives a plurality of Downlink Control Information (DCIs) in a slot, each of the DCIs having a Bandwidth Part (BWP) indicator field for indicating a BWP for a corresponding downlink (DL) reception or uplink (UL) transmission; and a processor that detects whether any one of the BWPs indicated in the DCIs is different from a current BWP which is used to receive the DCIs; and, upon detection that at least one of the BWPs indicated by the DCIs is different from the current BWP, configures the receiver and/or a transmitter to perform a BWP change.