LTE Resource Element Mapping Adaptability

Solution Overview

Problem

There is no specific procedure described in existing radio communication systems for determining resource element mapping for the Physical Downlink Shared Channel (PDSCH) in LTE, which affects efficient communication between base station devices and terminal devices.

Innovation Solution

A terminal device configures a transmission mode and up to 4 parameter sets based on higher-layer signals to determine resource element mapping for PDSCH, using parameters related to the number of Cell-specific Reference Signal (CRS) ports, CRS frequency position, and Multimedia Broadcast multicast service over a Single Frequency Network (MBSFN) subframe, to efficiently decode PDSCH.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple parameter sets are configured for different transmission scenarios, then the adaptability of resource element mapping is improved, but the device complexity increases

Engineering Contradiction:

Improveadaptability of resource element mappingVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent divides the resource element mapping configuration into multiple parameter sets (first parameter set, second parameter set, etc.), each optimized for specific transmission scenarios such as transmission mode 10 or non-transmission mode 10. This segmentation allows the system to select appropriate parameters for each scenario, improving adaptability while managing complexity through organized configuration groups.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent performs preliminary configuration of multiple parameter sets through higher layer signaling before actual PDSCH transmission occurs. By pre-configuring the parameter sets and their associated parameter values, the system prepares multiple mapping options in advance, enabling quick adaptation to different transmission modes without real-time computation overhead.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If multiple parameter sets are configured and stored for different transmission modes, then the versatility of the system is improved, but the loss of time for parameter selection increases

Engineering Contradiction:

Improveversatility of transmission mode supportVSAvoidtime for parameter set selection

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent performs preliminary configuration of multiple parameter sets through higher layer signaling before actual PDSCH transmission occurs. By pre-configuring the parameter sets and their associated parameter values, the system prepares multiple mapping options in advance, enabling quick adaptation to different transmission modes without real-time computation overhead.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The terminal device automatically selects the appropriate parameter set based on the detected transmission mode without requiring additional signaling or manual intervention. When the terminal receives PDCCH/EPDCCH, it autonomously determines whether transmission mode 10 is configured and selects the corresponding parameter set, eliminating time-consuming selection processes.

Inventive Principle:

Principle #25Self-service

3Reliability

If resource element mapping is determined using multiple parameter sets, then the reliability of PDSCH decoding is improved, but the device complexity increases

Engineering Contradiction:

Improvereliability of PDSCH decodingVSAvoidcomplexity of decoding process

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent divides the resource element mapping configuration into multiple parameter sets (first parameter set, second parameter set, etc.), each optimized for specific transmission scenarios such as transmission mode 10 or non-transmission mode 10. This segmentation allows the system to select appropriate parameters for each scenario, improving adaptability while managing complexity through organized configuration groups.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent applies different parameter sets with locally optimized parameters for specific transmission scenarios. The first parameter set is tailored for transmission mode 10 characteristics, while the second parameter set is optimized for other transmission modes. This local optimization ensures that each parameter set provides the most appropriate configuration for its intended use case, improving decoding reliability.

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP2919538B1User equipment, base station device, communication methods and integrated circuits

Publication Date: 2017.10.11 SHARP KK

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AI summary

A base station device and a terminal device determine resource element mapping in which a PDSCH is mapped and perform efficient communication. The terminal device uses a first parameter set among up to 4 parameter sets in order to determine resource element (RE) mapping for the PDSCH, when decoding the PDSCH based on detection of a Physical Downlink Control Channel (PDCCH) or an Enhanced Physical Downlink Control Channel (EPDCCH) with a Downlink Control Information (DCI) format 1A and transmitted on an antenna port 7, and determines RE mapping for the PDSCH by using the number of antenna ports for and/or a frequency position of a Cell-specific Reference Signal (CRS) in the serving cell when decoding the PDSCH based on detection of the PDCCH or the EPDCCH with the DCI format 1A and transmitted on antenna ports 0 to 3.