Multiple TRP Signaling Through TPMI Mapping for Dynamic PUSCH Switching
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently supporting dynamic switching between single and multi-TRP PUSCH transmissions while minimizing downlink control information (DCI) overhead, particularly in 5G NR networks.
Innovation Solution
The implementation of multiple transmission precoding matrix indicators (TPMIs) and SRS resource sets to schedule and map transmission instances, allowing for dynamic switching between single and multi-TRP transmissions, and reducing DCI overhead by repurposing certain TPMI entries to indicate mappings between PUSCH occasions and SRS resource sets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple TPMIs are used to indicate mappings between transmission instances and SRS resource sets, then adaptability is improved, but device complexity increases
Solution Approach 1:
The TPMI field is designed to serve multiple functions: it provides precoder information for uplink transmissions and simultaneously indicates mappings between transmission instances and SRS resource sets. This multi-functionality allows the system to support both single-TRP and multi-TRP transmissions using the same signaling mechanism, thereby improving adaptability without proportionally increasing DCI overhead.
Solution Approach 2:
The patent utilizes different values within the TPMI parameter space to indicate different transmission scenarios. Specific TPMI values are reserved to indicate mappings to single SRS resource sets (single-TRP), while other values indicate mappings to multiple SRS resource sets (multi-TRP). This parameter-based differentiation enables dynamic switching between transmission modes without requiring separate signaling fields.
2Loss of information
If TPMI entries are repurposed to indicate mappings, then DCI overhead is reduced, but measurement precision may be affected
Solution Approach 1:
The TPMI field values are segmented into different ranges or categories: certain values are dedicated to indicating mappings between transmission instances and SRS resource sets, while other values continue to provide precoder information. This segmentation allows the same field to convey different types of information depending on the value range, reducing overall DCI overhead while maintaining precise precoder indication when needed.
Solution Approach 2:
The patent introduces an intermediary mechanism where the TPMI field acts as a mediator between the DCI and the actual transmission parameters. By using specific TPMI values to indicate mappings, the system can derive both the mapping information and precoder information from a single field, reducing the need for separate signaling and minimizing information loss.
Data Source
AI summary
Presented are systems, methods, apparatuses, or computer-readable media for multiple transmit reception point (TRP) transmission signaling. A wireless communication node may transmit, to a wireless communication device, a scheduling grant to schedule a plurality of transmission instances. The scheduling grant may include one or more transmission precoding matrix indicators (TPMIs) to indicate mappings between the plurality of transmission instances and a plurality of sounding reference signal (SRS) resource sets for uplink codebook based transmissions.