Multi-TRP PUSCH Spatial Filter Derivation Without Explicit Signaling
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Solution Overview
Problem
Existing wireless communication systems face challenges in defining default spatial settings and pathloss reference signals for multi-Transmission Reception Point (TRP) based Physical Uplink Shared Channel (PUSCH) transmission, particularly in scenarios where explicit signaling is absent.
Innovation Solution
A method and user equipment (UE) are developed to derive default uplink spatial filters for multi-TRP based PUSCH transmission using Radio Resource Control (RRC) parameters and Downlink Control Indication (DCI) formats, determining spatial filters based on control resource sets and PUCCH resources, even when explicit settings are not provided.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If explicit spatial settings are provided for multi-TRP based PUSCH transmission, then transmission reliability is improved, but device complexity and signaling overhead increase
Solution Approach 1:
The UE autonomously determines default uplink spatial filters by itself based on RRC configured parameters and DCI formats, without requiring explicit spatial setting signaling from the network. This self-service mechanism reduces signaling overhead and device complexity while ensuring transmission reliability through standardized derivation procedures.
Solution Approach 2:
The network pre-configures RRC parameters including TCI states and spatial relation information before PUSCH transmission. The UE uses these pre-configured parameters to derive default spatial filters, eliminating the need for real-time explicit spatial setting signaling and reducing operational complexity.
2Loss of information
If default spatial filters are derived from RRC parameters and DCI formats, then signaling overhead is reduced, but measurement precision and transmission accuracy may be compromised
Solution Approach 1:
The patent introduces TCI states and spatial relation information as intermediary elements that bridge the network's scheduling intent and the UE's spatial filter derivation. These intermediaries carry essential spatial configuration information through RRC parameters, enabling accurate default spatial filter determination without explicit spatial setting signaling.
Solution Approach 2:
The patent changes the parameter representation from explicit spatial settings to derived parameters based on TCI states and spatial relation information. The UE derives default spatial filters by processing RRC configured parameters and DCI formats, transforming high-level configuration parameters into precise spatial filter settings through standardized algorithms.
3Adaptability or versatility
If multiple spatial settings are configured for multi-TRP transmission, then adaptability is improved, but ease of operation deteriorates due to complex filter selection
Solution Approach 1:
The patent segments the spatial configuration into separate RRC parameters including multiple TCI states and spatial relation information for different TRPs. This segmentation allows the network to configure multiple spatial settings independently, while the UE systematically derives default spatial filters for each TRP based on standardized procedures, reducing operational complexity despite enhanced adaptability.
Solution Approach 2:
The patent enables dynamic multi-TRP spatial filter adaptation through DCI format 0_0 scheduling. The UE dynamically selects and applies appropriate default spatial filters based on real-time scheduling decisions, allowing flexible adaptation to different TRP configurations without requiring complex manual intervention or fixed operational procedures.
Data Source
AI summary
A method performed by a user equipment (UE) for multiple transmission and reception points (multi-TRP) based physical uplink shared channel (PUSCH) transmission is provided. The method includes receiving, from a base station (BS), a Radio Resource Control (RRC) parameter that enables the UE to derive a default uplink (UL) spatial filter for PUSCH transmission; receiving, from the BS, a downlink control indication (DCI) format 0_0 that schedules the PUSCH transmission on a serving cell; determining one or two default UL spatial filters for the PUSCH transmission; and applying the one or two default UL spatial filters to perform the PUSCH transmission.