MIMO Operations with Multivariate TCI States for Multi-TRP Transmissions
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing high data traffic demands and supporting various vertical applications, particularly in 5G/NR communication systems, due to limitations in radio interface efficiency and coverage, especially in higher frequency bands.
Innovation Solution
Implementing MIMO operations with multivariate transmission configuration indicator (mv-TCI) states that include TCI state IDs, quasi co-location-types, and coherency types, associated with port groups, to enhance channel properties and transmission hypotheses for improved downlink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing wireless communication systems use conventional TCI states for downlink transmissions, then the system structure remains simple, but radio interface efficiency and coverage are insufficient to meet high data traffic demands
Solution Approach 1:
The patent segments the TCI state into multiple independent components: QCL-type parameters (for channel properties) and coherency-type parameters (for transmission hypotheses). Each component can be independently configured and combined, allowing flexible adaptation to different transmission scenarios without requiring a completely new complex system architecture.
Solution Approach 2:
The patent extends the traditional TCI state concept by adding a new dimension - the coherency-type parameter that indicates transmission hypotheses (e.g., single TRP, multiple TRPs, coordinated multi-point). This dimensional expansion allows the system to represent more complex transmission scenarios while maintaining backward compatibility with existing TCI state structures.
2Adaptability or versatility
If conventional TCI states are used without port group associations, then configuration is simple, but the system cannot adequately support advanced MIMO operations and multi-TRP transmissions
Solution Approach 1:
The patent makes the TCI state universal by enabling it to serve multiple functions simultaneously: indicating QCL-type parameters for channel properties, specifying coherency-type parameters for transmission hypotheses, and associating with port groups for MIMO operations. This multi-functionality allows a single TCI state structure to support both conventional and advanced transmission modes.
Solution Approach 2:
The patent introduces dynamic configurability where the TCI state can adaptively include different combinations of QCL-type and coherency-type parameters depending on the transmission scenario. The system can dynamically select which parameters to activate based on whether single-TRP or multi-TRP transmission is needed, avoiding fixed complex configurations.
3Reliability
If the system supports multiple transmission hypotheses with different coherency types, then transmission reliability improves, but processing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple TCI states with different coherency-type parameters before actual transmission occurs. Each TCI state is prepared in advance with the appropriate QCL-type and coherency-type combinations, allowing the receiver to quickly select and process the correct hypothesis without complex real-time analysis.
Solution Approach 2:
The system incorporates feedback mechanisms where the receiver reports channel state information and transmission quality metrics back to the transmitter. This feedback enables the system to dynamically adjust which TCI states and coherency hypotheses are activated, optimizing transmission reliability while reducing processing complexity by focusing resources on the most effective transmission modes.
Data Source
AI summary
Apparatuses and methods for multiple-input multiple-output (MIMO) operations. A method performed by a user equipment (UE) includes receiving information about a list of multivariate transmission configuration indicator (mv-TCI) states and receiving an indication about a mv-TCI state from the list of mv-TCI states. Each of the mv-TCI states includes a TCI state ID, a quasi co-location-type (QCL-type), and a coherency type and is associated with at least one port group (PG) comprising n ports. The method further includes identifying, based on the mv-TCI state, the QCL-type, the coherency type, and the at least one PG; determining, based on the QCL-type, common channel properties; determining, based on the coherency type, a transmission hypothesis; and receiving, from the at least one PG, a downlink (DL) transmission based on the determined common channel properties and the determined transmission hypothesis.