Terminal Device Resource Element Mapping for PDSCH
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Solution Overview
Problem
There is a lack of specific procedures described for base station and terminal devices to transmit and receive downlink data based on resource elements with mapped physical signals or channels in radio communication systems, particularly in heterogeneous network deployments using cooperative multipoint transmission schemes.
Innovation Solution
The implementation of a base station and terminal device configuration that includes data control, transmit data modulation, radio, scheduling, channel estimation, receive data demodulation, and higher layer units, which map signals onto physical channels based on scheduling information and perform rate-matching according to cell-specific reference signal positions, enabling efficient communication by avoiding resource elements used by other physical signals or channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If downlink data is transmitted based on resource elements with mapped physical signals or channels in heterogeneous network deployments, then communication efficiency is improved, but resource element mapping complexity increases due to lack of specific procedures
Solution Approach 1:
The patent segments the resource element mapping process into distinct procedures: identifying resource elements mapped to physical signals/channels, determining available resource elements for PDSCH, and performing rate-matching based on these determinations. This segmentation reduces mapping complexity by providing structured steps.
Solution Approach 2:
The patent applies preliminary action by having the terminal device identify and determine resource element mappings before PDSCH reception. The terminal pre-determines which resource elements are occupied by physical signals or channels, enabling efficient rate-matching and improving overall communication efficiency.
2Productivity
If rate-matching is performed according to cell-specific reference signal positions, then resource utilization is optimized, but processing overhead increases
Solution Approach 1:
The terminal device performs self-service by autonomously determining the positions of cell-specific reference signals and using these positions to guide rate-matching operations. This self-determination reduces processing overhead by eliminating the need for extensive base station signaling while optimizing resource utilization.
3Adaptability or versatility
If multiple CRS patterns are configured for multi-cell JP CoMP, then interference coordination capability is improved, but configuration complexity increases
Solution Approach 1:
The patent implements dynamics by enabling dynamic selection and configuration of multiple CRS patterns through RRC configuration and DCI signaling. The system can adaptively configure different CRS patterns (varying number of ports and frequency shifts) based on channel conditions and interference scenarios, improving interference coordination while managing configuration complexity through hierarchical signaling.
Data Source
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AI summary
A terminal device includes means of determining resource elements to which a physical downlink shared channel is mapped for transmission on the physical downlink shared channel in a non-MBSFN subframe that is scheduled by using a downlink control information format 1A based on positions of cell-specific reference signals that are provided by using a physical layer cell identity.