PDSCH Scheduling Flexibility via Front Loaded DMRS Position
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Solution Overview
Problem
The existing NR system's PDSCH scheduling lacks flexibility due to non-configurable UE time domain specific tables in DCI Format 1-0, limiting available resources for PDSCH.
Innovation Solution
A method is introduced to determine a starting symbol position for the PDSCH based on a front loaded demodulation reference signal, using a preset time domain table to derive a row index for downlink control information, allowing for multiple configurable symbol positions and lengths, thereby enhancing scheduling flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a non-configurable UE time domain specific table is used in DCI Format 1-0, then the system complexity is reduced, but the scheduling flexibility and available PDSCH resources are limited
Solution Approach 1:
The patent introduces configurable UE time domain specific tables that can be dynamically selected and configured based on different scheduling scenarios. The base station can configure multiple tables with different time domain resource parameters, and the UE can switch between them according to DCI indications, making the system adaptable without excessive complexity
Solution Approach 2:
The patent enables configuration of time domain resource parameters (such as starting symbol, symbol length, slot offset) through higher layer signaling and DCI. By changing these parameters dynamically, the system achieves scheduling flexibility while maintaining a structured table-based framework that limits complexity
2Adaptability or versatility
If more row indexes are added to indicate more starting symbol positions, then the scheduling flexibility is improved, but the DCI size and processing complexity increase
Solution Approach 1:
The patent divides the time domain resource indication into multiple independent parameters: row index in the table, starting symbol position, and symbol length. This segmentation allows flexible combination of parameters to achieve various scheduling scenarios without requiring an exponentially large table, thus limiting DCI complexity
Solution Approach 2:
The patent introduces multiple dimensions for resource indication: table selection dimension, row index dimension, and parameter combination dimension. By using multiple dimensions, the system can achieve fine-grained scheduling control with a compact DCI structure, avoiding the need for a single large exhaustive table
3Device complexity
If the PDSCH scheduling uses fixed time domain resource allocation, then the system complexity is reduced, but the ability to meet diverse user demands and support additional configurations is limited
Solution Approach 1:
The patent creates a universal time domain resource allocation framework that can serve multiple purposes: supporting different PDSCH mapping types (Type 1 and Type 2), accommodating various slot configurations, and adapting to different traffic patterns. The same configurable table structure handles all these scenarios, providing multi-functionality without separate dedicated systems for each case
Solution Approach 2:
The patent pre-configures multiple UE time domain specific tables with various time domain resource parameters through higher layer signaling before actual PDSCH transmission. This preliminary configuration allows the system to quickly adapt to different user demands during operation without real-time complex calculations, reducing operational complexity while maintaining high adaptability
Data Source
AI summary
Disclosed in some examples are a method for physical downlink shared channel receiving and a method for indicating its time domain resource, and a device, a storage medium, a base station, and a terminal thereof. The method for indicating the time domain resource for the physical downlink shared channel includes: determining a starting symbol position of the time domain resource for transmitting the physical downlink shared channel based on a symbol position for a front loaded demodulation reference signal; determining a row index in a preset time domain table at least based on the starting symbol position; and carrying the row index in a downlink control information, and transmitting the downlink control information to a user equipment. The technical solution of the present disclosure can achieve the flexibility in PDSCH schedule.