EPDCCH PDSCH Transmission Scheme Adaptation
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Solution Overview
Problem
Existing wireless communication systems face challenges in determining a suitable Physical Downlink Shared Channel (PDSCH) transmission scheme for fallback mode Downlink Control Information (DCI) format when receiving signals through an Enhanced Physical Downlink Control Channel (EPDCCH).
Innovation Solution
A method and apparatus for user equipment to decode fallback DCI format in an EPDCCH physical resource block set, determining the PDSCH transmission scheme based on whether the EPDCCH corresponds to localized or distributed transmission, using a single antenna port for localized transmission and a predetermined scheme for distributed transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fallback DCI format is received through EPDCCH, then control information can be reliably decoded, but the PDSCH transmission scheme becomes ambiguous and difficult to determine
Solution Approach 1:
The patent applies local quality by making the PDSCH transmission scheme determination dependent on the local characteristics of EPDCCH transmission mode. When EPDCCH uses localized transmission, the PDSCH uses single antenna port transmission; when EPDCCH uses distributed transmission, the PDSCH uses transmission diversity. This local adaptation resolves the ambiguity by tying the PDSCH scheme to the specific EPDCCH transmission mode used.
Solution Approach 2:
The patent changes the parameter of PDSCH transmission scheme based on the EPDCCH transmission mode parameter. By establishing a direct mapping between EPDCCH transmission mode (localized/distributed) and PDSCH transmission scheme (single antenna port/transmission diversity), the patent resolves the determination ambiguity through parameter correlation rather than requiring separate indication signaling.
2Ease of operation
If a single PDSCH transmission scheme is used for all EPDCCH cases, then the system is simple to operate, but it cannot optimize performance for different transmission modes
Solution Approach 1:
The patent introduces dynamics by making the PDSCH transmission scheme adaptive to the EPDCCH transmission mode. Instead of a static single scheme, the system dynamically selects between single antenna port transmission (for localized EPDCCH) and transmission diversity (for distributed EPDCCH), optimizing performance for each case while maintaining automatic operation without additional signaling.
3Adaptability or versatility
If the PDSCH transmission scheme is determined by transmission mode, then adaptability is improved, but the device complexity increases due to multiple determination criteria
Solution Approach 1:
The patent applies local quality by creating a direct local mapping between EPDCCH transmission mode and PDSCH transmission scheme. The determination logic is simplified to check the EPDCCH transmission mode and apply the corresponding PDSCH scheme, avoiding complex multi-criteria evaluation while maintaining full adaptability to different transmission scenarios.
Data Source
AI summary
One embodiment of the present invention relates to a method for enabling a terminal to receive a downlink signal through an enhanced physical downlink control channel (EPDCCH), comprising the steps of: decoding fallback downlink control information (DCI) format in an EPDCCH physical resource block set; and receiving a physical downlink shared channel (PDSCH) on the basis of the fallback DCI format, wherein the PDSCH transmission for receiving the PDSCH is determined according to whether the EPDCCH physical resource block set corresponds to localized EPDCCH transmission or distributed EPDCCH transmission.