Adaptive Reference-Signal Mapping for NR-LTE Overlap
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Solution Overview
Problem
Existing wireless communication systems face inefficiencies in signal transmission and reception procedures, particularly in scenarios where different wireless communication technologies like 3GPP NR and LTE overlap, leading to bottlenecks in resource utilization and PDCCH capacity.
Innovation Solution
The method involves adjusting the frequency domain interval between resource elements for reference signals in overlapping symbols to optimize signal mapping, allowing efficient transmission and reception of NR PDCCH signals even in symbols used for LTE cell-specific reference signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If reference signals for different wireless communication systems are mapped to overlapping resource elements, then resource utilization is improved, but signal interference and reception reliability deteriorate
Solution Approach 1:
The patent applies local quality by making the reference signal mapping pattern adaptive to local conditions. Specifically, the mapping interval of reference signals is dynamically adjusted based on whether there is overlap with reference signals from other wireless communication systems. In overlapping regions, the mapping interval is increased to avoid conflict, while in non-overlapping regions, the standard mapping interval is used to maximize resource utilization.
2Reliability
If the frequency domain interval between resource elements for reference signals is increased in overlapping symbols, then signal interference is reduced, but resource utilization deteriorates
Solution Approach 1:
The patent implements dynamics by making the reference signal mapping interval variable rather than fixed. The mapping interval is dynamically adjusted based on the detection of overlap conditions between reference signals of different wireless communication systems. This allows the system to optimize between reliability and resource utilization in real-time according to the actual transmission environment.
3Device complexity
If reference signals from different wireless communication systems use the same resource elements, then system complexity is reduced, but signal detection accuracy deteriorates
Solution Approach 1:
The patent applies preliminary action by detecting potential reference signal overlaps before actual signal transmission and adjusting the mapping interval in advance. This proactive approach allows the system to prevent interference issues before they occur, ensuring accurate signal detection without requiring complex real-time interference mitigation techniques during signal reception.
Data Source
AI summary
According to at least one of various embodiments of the present invention, a terminal may: receive a first reference signal for first wireless communication; and receive a physical downlink control channel (PDCCH) for the first wireless communication on the basis of the first reference signal, wherein, on the basis that the first reference signal and a second reference signal for second wireless communication overlap with each other on at least one symbol in a time domain, the interval in a frequency domain between resource elements (REs) to which the first reference signal is mapped on the overlapping at least one symbol may be changed from a first RE interval to a second RE interval.