Downlink Channel Reception With Multi-TRP Segmentation
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving downlink channels from multiple transmission and reception points (TRPs), particularly in managing downlink control and data channels effectively.
Innovation Solution
A method and device for transmitting and receiving downlink channels, where a terminal receives configuration information for repeat transmission, repeatedly receives a downlink control channel with the same downlink control information (DCI) from one or more TRPs, and based on the DCI, determines the number of CDM groups or repetitions for the downlink data channel, allowing reception from a single TRP or multiple TRPs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If downlink control channels are transmitted from multiple TRPs, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent segments the downlink control channel transmission by dividing it into multiple transmission opportunities (occasions) across different TRPs. The terminal receives DCI from multiple TRPs in a segmented manner, where each TRP transmits a portion of the control information or redundant copies, thereby improving reliability while managing complexity through structured segmentation of the reception process
Solution Approach 2:
The patent applies preliminary action by configuring the terminal with TCI (Transmission Configuration Indicator) information in advance through RRC signaling or MAC CE. This pre-configuration allows the terminal to prepare reception parameters before actual downlink control channel transmission, reducing real-time processing complexity while maintaining multi-TRP reliability
2Measurement precision
If TCI information is included in downlink control channels from multiple TRPs, then transmission configuration precision is improved, but loss of information increases
Solution Approach 1:
The patent applies local quality by associating different TCI states with different TRPs locally. Each TRP is assigned specific TCI information appropriate to its transmission characteristics, allowing precise configuration for each TRP's signal while avoiding redundant or conflicting information across multiple TRPs
Solution Approach 2:
The patent uses copying by transmitting redundant copies of DCI with TCI information from multiple TRPs. The terminal receives multiple copies of control information from different TRPs, ensuring that complete configuration information is obtained even if some transmissions are lost, thereby preventing information loss while maintaining configuration precision
3Adaptability or versatility
If the terminal determines CDM groups or repetitions based on DCI, then adaptability is improved, but difficulty of detecting and measuring increases
Solution Approach 1:
The patent applies dynamics by enabling the terminal to dynamically determine CDM (Code Division Multiplexing) groups and repetition parameters based on DCI content received from multiple TRPs. The DCI includes dynamic indicators that allow the terminal to adaptively adjust reception parameters according to actual transmission conditions, achieving flexibility while providing clear detection rules
4Device complexity
If downlink channels are transmitted from single TRP, then device complexity is reduced, but reliability deteriorates
Solution Approach 1:
The patent applies merging by combining transmissions from multiple TRPs into a unified reception process at the terminal. The terminal receives and processes control channels from multiple TRPs using combined processing rules, achieving reliability through diversity while managing complexity by merging the reception operations into a standardized procedure
Data Source
AI summary
Disclosed are a method and apparatus for transmitting or receiving a downlink channel from multiple transmission/reception points in a wireless communication system. A method for receiving a downlink channel by a terminal in a wireless communication system, according to one embodiment of the present disclosure, comprises the steps of: receiving configuration information associated with repetitive transmission of a downlink channel; repetitively receiving a downlink control channel including the same downlink control information (DCI) from one or more transmission/reception points (TRPs), wherein the DCI indicates at least one from among the number of code division multiplexing (CDM) groups and the number of repetitions for a downlink data channel; and receiving, on the basis of the DCI not including transmission configuration indicator (TCI) information, a downlink data channel from a single TRP (STRP) or multiple TRP (MTRP) from among the one or more TRPs on the basis of one or more from among the configuration information, the number of CDM groups, and the number of repetitions for the downlink data channel.