Multi-TRP PDCCH Signaling With Independent TCI and DMRS Mapping
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Solution Overview
Problem
Existing 3GPP NR systems face challenges in efficiently coordinating multi-TRP communication, particularly in scenarios with non-ideal backhaul, where DMRS port mapping and TCI state signaling for multiple TRPs are not effectively supported, leading to potential increases in DCI overhead and reduced flexibility.
Innovation Solution
The proposed solution involves signaling modifications for DMRS port indication and TCI state using a single PDCCH, allowing separate mapping and independent signaling for multiple TRPs, utilizing RNTI-based approaches to indicate DMRS ports and TCI states without significant DCI overhead increase, and incorporating multi-TRP configuration tables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PDCCH signaling is used to schedule transmissions between multiple TRPs, then coordination between TRPs is improved, but DCI overhead increases
Solution Approach 1:
The patent segments the transmission scheduling by using separate TCI states for different TRPs within the same DCI message. Each TRP's transmission parameters are independently configured through separate TCI state indicators, allowing granular control over multiple TRPs without requiring separate DCI messages for each TRP, thus reducing overall overhead while maintaining coordination.
Solution Approach 2:
The DCI structure is designed to serve multiple TRPs simultaneously through a universal framework that incorporates multiple TCI state indicators. This multi-functional DCI message can schedule transmissions for multiple TRPs in one go, eliminating the need for multiple separate scheduling messages and reducing signaling overhead while maintaining comprehensive TRP coordination.
2Reliability
If multiple TCI states are signaled for multi-TRP communication, then transmission reliability is improved, but signaling complexity increases
Solution Approach 1:
The patent implements dynamic TCI state selection where the UE can be configured with multiple TCI states and the appropriate state is activated based on current transmission conditions. This dynamic approach allows the system to adaptively select from pre-configured TCI states, reducing the need for frequent re-signaling of complete parameter sets and simplifying ongoing signaling while maintaining transmission reliability.
Solution Approach 2:
Multiple TCI states are pre-configured and stored in the UE before actual transmission occurs. This preliminary configuration allows the network to quickly switch between pre-defined transmission parameter sets without requiring complex real-time signaling, thereby reducing signaling complexity while ensuring reliable transmission through having multiple ready-to-use parameter configurations.
3Adaptability or versatility
If independent TCI state signaling is implemented for each TRP, then transmission flexibility is improved, but DCI message size increases
Solution Approach 1:
The patent applies local quality by allowing different TCI states to be assigned to different TRPs within the same DCI message based on their specific channel characteristics and transmission requirements. Each TRP can have its own optimized parameters locally configured, providing transmission flexibility for each individual TRP while using a compact joint signaling structure that avoids the overhead of completely separate signaling messages.
Data Source
AI summary
The present disclosure relates to a user equipment (UE), a network node, and communication methods respectively for a UE and a network node. The UE comprises a transceiver which, in operation, receives, on a physical downlink control channel, PDCCH, downlink control information, DCI, for scheduling a plurality of transmissions or receptions between the UE and a plurality of transmission and reception points, TRPs, on a plurality of channels, the DCI including one or more indicators indicating one or more respective transmission parameters, and circuitry which, in operation, obtains, based on the one or more indicators and on a configuration, a plurality of values respectively of the one or more transmission parameters. The transceiver, in operation, performs the plurality of transmissions or receptions using a respective one of the plurality of values of the one or more transmission parameters for each of the plurality of transmissions or receptions.