PDSCH Starting Position Determination in LTE Terminals
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Solution Overview
Problem
There is no specific procedure disclosed for determining the starting position of the resource element to which the Physical Downlink Shared Channel (PDSCH) is mapped in the LTE radio communication system, affecting efficient communication between base station and terminal devices.
Innovation Solution
A terminal device and base station device are configured to determine the starting position of the OFDM symbol for the PDSCH based on specific indices and parameters, considering different transmission modes and DCI formats, ensuring efficient communication by accurately mapping the PDSCH resource elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the starting position of PDSCH resource element is not specifically determined, then the system maintains simplicity in configuration, but communication efficiency deteriorates due to ambiguous resource allocation
Solution Approach 1:
The patent applies parameter changes by dynamically determining the starting position of PDSCH resource elements based on transmission mode parameters and antenna port configurations. Different parameter sets (first parameter set for antenna ports 0-3, second parameter set for antenna ports 7-14) enable flexible adjustment of resource element mapping parameters according to the specific transmission mode and antenna configuration, thereby improving communication efficiency without excessive complexity
Solution Approach 2:
The patent segments the parameter configuration into multiple distinct parameter sets based on antenna port groups. The first parameter set applies to antenna ports 0-3 while the second parameter set applies to antenna ports 7-14, allowing independent optimization of PDSCH resource element mapping for different antenna configurations. This segmentation enables targeted parameter adjustment for different transmission scenarios
2Adaptability or versatility
If multiple parameter sets are configured for different antenna ports, then adaptability to different transmission modes improves, but device complexity increases due to multiple configuration parameters
Solution Approach 1:
The patent changes parameters by defining distinct parameter sets for different antenna port ranges. The first parameter set is used when antenna ports 0-3 are configured, while the second parameter set is used when antenna ports 7-14 are configured. This parameter differentiation enables the system to adapt to various transmission modes (transmit diversity, spatial multiplexing, multi-user MIMO) without requiring a completely different configuration framework
Solution Approach 2:
The patent achieves universality by creating a unified parameter configuration framework that handles multiple antenna port configurations through two general parameter sets. Rather than creating separate configurations for each transmission mode, the system uses these parameter sets to cover multiple transmission modes (TM10, TM11, TM12) and their respective antenna configurations, reducing overall system complexity
Data Source
AI summary
A base station device and a terminal device efficiently communicate with each other by using a PDSCH. The base station device and the terminal device determine a starting position of an OFDM symbol for a PDSCH in a serving cell based on a transmission mode relating to transmission of the PDSCH, a DCI format that is used for allocation of the PDSCH, an antenna port that is used for the transmission of the PDSCH, and a higher-layer parameter that is determined from a parameter set for a serving cell in which the PDSCH is received.