TRP-Specific Preemption Indication for Non-Coherent Joint Transmission
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G and LTE networks, face challenges in efficiently managing downlink preemption indications for non-coherent joint transmissions, leading to degraded decoding performance and resource wastage due to non-specific preemption indications across multiple transmitting entities.
Innovation Solution
The implementation of TRP-specific downlink preemption indications using additional bits or new interpretations of existing bit-maps in the Group-Common DCI, allowing user equipment to accurately identify preempted resources and improve decoding performance by distinguishing between different transmitting entities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If non-specific preemption indications are used across multiple transmitting entities, then device complexity is reduced and ease of operation is improved, but decoding performance deteriorates and resource utilization is degraded
Solution Approach 1:
The preemption indication is segmented by associating it with specific transmitting entity identifiers (such as TRP-specific IDs or DMRS port group IDs). This allows the indication to be divided into entity-specific segments rather than applying universally, enabling the UE to accurately identify which transmitting entity's resources are preempted while maintaining operational simplicity through standardized signaling procedures.
2Reliability
If TRP-specific preemption indications are implemented, then decoding performance is improved and resource utilization is optimized, but device complexity and signaling overhead increase
Solution Approach 1:
The preemption indication mechanism is designed with multi-functionality to serve both specific and general scenarios. The same DCI structure and bit-map formats are used whether indicating preemption for a single TRP or multiple TRPs, with the specificity controlled by the presence of TRP identifier fields. This universal approach allows the system to adapt to different complexity requirements without changing the fundamental indication mechanism.
3Measurement precision
If additional bits are added to Group-Common DCI for TRP-specific indications, then measurement precision and identification accuracy are improved, but signaling overhead and processing complexity increase
Solution Approach 1:
The solution applies partial action by conditionally including TRP identifier bits in the DCI based on whether TRP-specific differentiation is required. When multiple transmitting entities are involved and differentiation is needed, additional bits are added; when a single entity transmits or differentiation is unnecessary, the standard format is used without extra bits. This partial approach provides identification accuracy only when needed, avoiding unnecessary signaling overhead.
Data Source
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AI summary
Certain aspects of the present disclosure provide techniques for indicating a preemption of resources impacting a joint transmission from multiple transmitting entities to a user equipment. The transmitting entities may be associated with a virtual cell ID or a demodulation reference signal (DMRS) port group ID.