DMRS Time Domain Positioning for LTE-NR Coexistence
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Solution Overview
Problem
Current 5G NR systems face challenges in configuring the time domain position of a demodulation reference signal (DMRS) on a physical downlink shared channel (PDSCH) to minimize interference with the cell common signal (CRS) in LTE, especially when both technologies share a spectrum.
Innovation Solution
A communication method that involves receiving indication information from a network device to set the time domain position of a DMRS on a PDSCH, ensuring that the position does not overlap with the CRS, thereby reducing mutual interference and improving transmission performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the time domain position of DMRS is dynamically configured in 5G NR, then the adaptability of resource allocation is improved, but the risk of interference with LTE CRS increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple candidate time domain positions for DMRS and pre-identifying which candidates would cause interference with LTE CRS. The network device prepares indication information in advance that guides the terminal to select only non-interfering positions, thus preventing interference before it occurs while maintaining dynamic adaptability.
Solution Approach 2:
The patent implements dynamics by allowing the DMRS time domain position to be dynamically selected from multiple candidates based on real-time spectrum sharing conditions with LTE. The network device can dynamically indicate different positions through indication information, enabling the system to adapt to changing interference conditions while avoiding fixed positioning that would cause consistent interference.
2Reliability
If multiple candidate PDSCHs are evaluated for DMRS positioning, then the transmission reliability is improved, but the signaling overhead increases
Solution Approach 1:
The patent applies partial action by evaluating multiple candidate PDSCHs for DMRS positioning but only selecting and indicating the optimal non-interfering position. Rather than transmitting information about all candidates, the system performs partial evaluation to identify suitable positions and then communicates only the necessary selection information, reducing signaling overhead while maintaining the reliability benefits of multiple-candidate evaluation.
Data Source
AI summary
A communication method and apparatus, the method including receiving first indication information sent by a network device, where the first indication information is used to indicate a time domain position of a demodulation reference signal (DMRS) set on a physical downlink shared channel (PDSCH), and the DMRS set includes N DMRSs, where a quantity of candidate PDSCHs that meet a first condition in M candidate PDSCHs of the PDSCH is greater than or equal to a first threshold, receiving second indication information sent by the network device, where the second indication information is used to indicate a first PDSCH, and receiving, on the first PDSCH based on the first indication information and the second indication information, data sent by the network device.