Multi-PDSCH Reception with Grouped TCI States and QCL Signals
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing and transmitting multiple physical downlink shared channels (PDSCHs) due to resource shortages and the need for higher data rates, leading to increased latency and reduced reliability.
Innovation Solution
A method is proposed for transmitting and receiving multiple PDSCHs by configuring K time unit groups with different quasi co-location (QCL) source signals, using transmission configuration indication (TCI) states, and employing media access control (MAC) and downlink control information (DCI) to schedule PDSCHs across these groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple PDSCHs are transmitted through multiple transmission points to increase data rate, then productivity is improved, but device complexity increases due to need to manage multiple TCI states and QCL source signals
Solution Approach 1:
The patent segments the transmission configuration by dividing time units into groups, where each group is associated with a specific TCI state and QCL source signal. This segmentation allows the UE to manage multiple PDSCHs from different transmission points by organizing them into discrete time unit groups, reducing the complexity of simultaneous management while maintaining high data rates through parallel transmissions.
Solution Approach 2:
The patent applies preliminary action by configuring TCI states and QCL source signals in advance for multiple time unit groups before actual PDSCH transmission. The base station pre-configures the UE with multiple TCI states and associates them with specific time unit groups, so that when PDSCHs are transmitted from multiple transmission points, the UE already has the necessary configuration information ready, reducing real-time processing complexity.
2Reliability
If PDSCHs are transmitted through different transmission points to improve reliability, then reliability is improved, but loss of time increases due to coordination overhead between transmission points
Solution Approach 1:
The patent merges the configuration of multiple TCI states and QCL source signals into a unified framework where multiple transmission points are coordinated through pre-configured time unit groups. By combining the management of multiple transmission configurations into a single structured approach, the patent reduces coordination overhead and signaling latency while maintaining the reliability benefits of diverse transmission paths.
Solution Approach 2:
The patent reduces latency by performing preliminary configuration of TCI states and QCL source signals associated with specific time unit groups before PDSCH transmission. This advance configuration eliminates the need for real-time coordination and signaling during actual data transmission, thereby reducing loss of time while still enabling reliable multi-point transmission.
3Productivity
If K TCI states are configured for K time unit groups to reduce latency, then productivity is improved, but device complexity increases due to additional configuration information
Solution Approach 1:
The patent applies universality by designing a multi-functional TCI state configuration framework that serves multiple purposes simultaneously. The same TCI state configuration mechanism is used for both beam management and time unit group association, and the QCL source signals serve both reference signal functions and transmission configuration functions. This multi-functionality reduces the need for separate configuration systems, thereby limiting the increase in device complexity while improving productivity.
Data Source
AI summary
The present specification provides a method for transmitting and receiving a plurality of PDSCHs in a wireless communication system and a device for same. In particular, the method carried out by a terminal may comprise the steps of: receiving configuration information for configuring a number K of time-unit groups for receiving a plurality of PDSCHs via different quasi co-location (QCL) source signals; receiving PDSCH configuration information including information about a plurality of transmission configuration indication (TCI) states; receiving information about a number K of TCI states, corresponding to the number K of time-unit groups, among the plurality of TCI states; and receiving the plurality of PDSCHs on the basis of the number K of TCI states.