Antenna Port Determination via Group Segmentation
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Solution Overview
Problem
In wireless communications, accurately determining antenna ports for downlink data transmission is challenging due to a large quantity of candidate ports, leading to potential inaccuracies and increased signaling overheads.
Innovation Solution
The introduction of antenna port group information allows terminal side devices to accurately determine the required antenna port by using quasi-co-location (QCL) information and indication information, reducing signaling overheads by reusing indication information to indicate multiple types of information and facilitating channel estimation across related antenna ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large quantity of candidate antenna ports are used for downlink data transmission, then the adaptability and coverage of the wireless communication system are improved, but the difficulty of accurately determining the required antenna port increases and signaling overheads increase
Solution Approach 1:
The patent segments the large set of candidate antenna ports into multiple antenna port groups. Each group contains antenna ports with similar characteristics or QCL relationships. The terminal device first determines the appropriate antenna port group based on QCL information, then selects the specific antenna port within that group. This segmentation reduces the search space and determination complexity while maintaining adaptability across all candidate ports.
Solution Approach 2:
The patent introduces antenna port group information as an intermediary between the downlink control information and the final antenna port determination. The QCL information serves as a mediator that links the scheduled downlink data to the appropriate antenna port group, which in turn contains the specific antenna port. This intermediary structure simplifies the determination process by breaking it into manageable steps.
2Measurement precision
If detailed indication information is provided to accurately determine antenna ports, then the measurement precision of antenna port determination is improved, but the signaling overheads in downlink control information increase
Solution Approach 1:
The indication information is segmented into two parts: QCL information that identifies the antenna port group, and additional indication information that specifies the exact antenna port within the group. This segmentation allows the system to use compact QCL information for group identification (reducing overhead) while maintaining precise antenna port determination through the second stage of indication.
Solution Approach 2:
The patent performs preliminary determination of the antenna port group using QCL information before finalizing the specific antenna port selection. This preliminary action narrows down the candidate set, allowing the subsequent indication information to work with a smaller, more manageable set of candidates, thereby reducing the number of bits required for precise indication.
3Loss of information
If antenna port group information is introduced to reduce signaling overheads, then the loss of information is reduced, but the device complexity increases due to additional processing requirements
Solution Approach 1:
The antenna port group information is prepared and configured in advance through QCL relationships established via RRC signaling before the actual downlink data transmission. This preliminary configuration allows the terminal device to efficiently determine antenna ports during data reception without complex real-time processing, as the group structure is pre-established and readily available.
Data Source
AI summary
An embodiment of this application provides an antenna port determining method. In a process of determining, based on QCL information and indication information that is used to determine an antenna port number, an antenna port on which downlink data is scheduled, antenna port group information is further introduced, so that the antenna port can be more accurately determined.