PDSCH Start Symbol Index Determination via PQI Parameter Sets
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Solution Overview
Problem
In advanced wireless communication systems, accurately determining the relationship between antenna ports is challenging, particularly in quasi co-located (QCL) scenarios, which affects the efficient reception of downlink signals.
Innovation Solution
A method for a user equipment (UE) to determine the start symbol index of a physical downlink shared channel (PDSCH) signal by using a Quasi co-location Indicator (PQI) parameter set, configured by a higher layer, to accurately receive the PDSCH signal, considering the QCL relationship between antenna ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple antenna ports are used for downlink transmission, then data transmission rate and throughput are improved, but the complexity of determining antenna port relationships and receiving signals increases
Solution Approach 1:
The network side performs preliminary configuration by providing PQI parameter sets that contain start symbol index information for different antenna ports before the actual PDSCH reception. This allows the terminal to pre-determine the timing parameters without complex real-time calculations during signal reception.
Solution Approach 2:
The PQI (PDSCH resource element mapping and Quasi co-location Indicator) parameter set acts as an intermediary that carries start symbol index information from the network side to the terminal. This intermediary structure simplifies the interface between the complex MIMO system and the terminal by providing ready-to-use timing parameters.
2Measurement precision
If the terminal determines start symbol index dynamically for each PDSCH reception, then reception accuracy is improved, but processing time and complexity increase
Solution Approach 1:
Start symbol index values are pre-configured in PQI parameter sets by the network side for different antenna ports and scenarios. The terminal simply retrieves the appropriate start symbol index from the configured PQI set based on the antenna port relationship, avoiding dynamic calculation and reducing processing time while maintaining accuracy.
Solution Approach 2:
The system changes from dynamic real-time determination of start symbol indices to using pre-configured parameter sets. By transforming the problem from calculation to retrieval, the system achieves both accuracy (through proper configuration) and efficiency (through reduced processing).
Data Source
AI summary
The present invention relates to a wireless communication system, and more specifically, to a method and an apparatus for transmitting or receiving a downlink signal considering an antenna port relationship. The method for enabling a terminal to receive a physical downlink sharing channel (PDSCH) signal in the wireless communication system according to one embodiment of the present invention can determine a PDSCH start symbol index according to the predetermined priority and receive the PDSCH signal therethrough. The PDSCH start symbol index can be determined when a PDSCH start symbol value included in a PDSCH resource element mapping and Quasi co-location Indicator (PQI) parameter set is determined by an upper layer. The PDSCH start symbol index can be determined according to the PDSCH start symbol value for a cell receiving the PDSCH when the PDSCH start symbol value included in the PQI parameter set is not determined by the upper layer.