Dynamic Subframe Reconfiguration for Interference Mitigation in FDD Systems
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently transmitting and receiving downlink signals, particularly in dynamically reconfiguring subframes between uplink and downlink directions, which affects interference mitigation and traffic adaptation in Frequency Division Duplex (FDD) systems.
Innovation Solution
The method involves configuring user equipment to receive downlink signals through Frequency Division Duplex (FDD) cells with uplink and downlink component carriers, processing data using Orthogonal Frequency Division Multiple Access (OFDMA) or Single Carrier Frequency Division Multiple Access (SC-FDMA) schemes based on subframe reconfiguration, and mapping Demodulation Reference Signals (DMRS) and control channels accordingly to minimize interference and enhance data transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If subframes are dynamically reconfigured between uplink and downlink directions in FDD systems, then traffic adaptation capability is improved, but inter-cell interference increases
Solution Approach 1:
The patent applies local quality by differentiating DMRS mapping strategies based on the specific subframe type: distributed mapping for traditional downlink subframes and contiguous mapping for reconfigured downlink subframes. This localized adaptation optimizes performance for each subframe category while managing interference characteristics specific to reconfigured subframes.
Solution Approach 2:
The patent implements dynamics by enabling flexible switching between OFDM and SC-FDM schemes based on subframe reconfiguration status. The system dynamically adapts the modulation scheme and reference signal mapping according to whether a subframe is traditionally configured or reconfigured, allowing real-time optimization of traffic adaptation while managing interference.
2Productivity
If OFDM scheme is used for downlink data transmission, then spectral efficiency is improved, but sensitivity to inter-cell interference increases
Solution Approach 1:
The patent applies parameter changes by switching between OFDM and SC-FDM schemes based on subframe reconfiguration status. For reconfigured downlink subframes, the system uses SC-FDM which has lower peak-to-average power ratio and reduced sensitivity to interference, while maintaining OFDM for traditional subframes where spectral efficiency is the priority.
Solution Approach 2:
The patent uses DMRS as an intermediary element that adapts its mapping strategy based on the transmission scheme. For SC-FDM in reconfigured subframes, contiguous DMRS mapping is used, while distributed mapping is used for OFDM in traditional subframes. This intermediary adaptation helps mitigate interference effects while maintaining spectral efficiency.
3Reliability
If SC-FDM scheme is used for reconfigured subframes, then interference robustness is improved, but spectral efficiency decreases
Solution Approach 1:
The patent applies local quality by using SC-FDM specifically for reconfigured downlink subframes where interference robustness is prioritized, while using OFDM for traditional downlink subframes where spectral efficiency is optimized. This localized application ensures each scheme is used where it provides the greatest benefit.
Solution Approach 2:
The patent implements dynamics by enabling flexible switching between OFDM and SC-FDM schemes based on subframe reconfiguration status. The system dynamically selects the appropriate scheme and corresponding DMRS mapping strategy, allowing real-time optimization of the trade-off between interference robustness and spectral efficiency.
4Measurement precision
If DMRS is mapped distributedly in downlink subframes, then channel estimation accuracy is improved, but control channel resource allocation becomes complex
Solution Approach 1:
The patent applies local quality by differentiating DMRS mapping strategies based on subframe type: distributed mapping for traditional downlink subframes where channel estimation accuracy is prioritized, and contiguous mapping for reconfigured downlink subframes where resource allocation simplicity is prioritized.
Solution Approach 2:
The patent implements dynamics by enabling flexible switching between distributed and contiguous DMRS mapping based on subframe reconfiguration status. The system dynamically adapts the mapping strategy to match the transmission scheme and subframe characteristics, simplifying resource allocation for reconfigured subframes while maintaining accuracy for traditional subframes.
Data Source
AI summary
The present invention relates to a wireless communication system and, more particularly, to a method and a device for receiving a DL signal, by a terminal, in an FDD cell comprising a DL CC and a UL CC, the method comprising the steps of: receiving SF reconfiguration information about a UL CC; and receiving DL data on an FDD cell, wherein, if the DL data is received in a DL SF on the DL CC, the DL data is processed by means of an OFDM mode and, if the DL data is received in a DL SF reconfigured from a UL SF on the basis of the SF reconfiguration information on the UL CC, the DL data is processed by means of an SC-FDM mode.