LTE-NR Spectrum Sharing via X2 Resource Coordination
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Solution Overview
Problem
There is a need for a method that allows Long-Term Evolution (LTE) and New Radio (NR) systems to coexist in the same spectrum within a mobile communication system without requiring an additional carrier for NR, while enabling efficient data transmission and reception across different communication systems.
Innovation Solution
The method involves identifying and sharing resource information between LTE and NR base stations, allowing for scheduling and data transmission/reception alignment using MBSFN subframes, UL subframes, LAA operations in unlicensed bands, and cell activation in carrier aggregation, enabling both systems to operate on a single LTE carrier or multiple LTE carriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If LTE and NR systems operate in the same spectrum without additional NR carriers, then spectrum utilization efficiency is improved, but system complexity increases due to coordination requirements between LTE and NR base stations
Solution Approach 1:
The patent introduces an X2 interface as an intermediary communication channel between LTE and NR base stations. This interface enables resource information exchange and coordination without requiring complex direct integration, thus resolving the contradiction by providing a standardized mediation mechanism that simplifies the coordination overhead while enabling efficient spectrum sharing.
Solution Approach 2:
The X2 interface is designed to serve multiple functions including resource coordination, interference management, and handover support between LTE and NR systems. This multi-functionality reduces the need for separate dedicated coordination mechanisms, thereby decreasing overall system complexity while maintaining high spectrum utilization efficiency.
2Productivity
If resource information is shared between LTE and NR base stations, then resource utilization efficiency is improved, but information transmission overhead increases
Solution Approach 1:
The resource information exchanged between LTE and NR base stations is segmented into distinct categories including resource allocation, interference coordination, and scheduling parameters. This segmentation allows for targeted transmission of only necessary information elements, reducing overall overhead while maintaining comprehensive resource utilization efficiency.
Solution Approach 2:
The patent employs parameter changes by dynamically adjusting the level of detail in resource information based on current network conditions and coordination needs. When resource utilization is high, more detailed information is exchanged; when conditions are stable, simplified parameter sets are used, thereby optimizing the trade-off between resource utilization efficiency and information overhead.
Data Source
AI summary
The present disclosure relates to a 5G or pre-5G communication system for supporting a higher data rate than a 4G communication system such as LTE. According to an embodiment of the present invention, a method for a first base station in a first communication system comprises the steps of: identifying information related to a resource which can be used by a second base station in a second communication system; generating a message including the information related to the resource which can be used by the second base station; and transmitting the signal to the second base station.