LTE-NR Interference Control via Dynamic Resource Assignment
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Solution Overview
Problem
In mobile communication systems employing carrier aggregation or dual/multi-connectivity technologies, intra-terminal interference signals like harmonic interference or inter-modulation distortion (IMD) degrade terminal reception performance, particularly in specific frequency band reception stages, necessitating effective interference control methods.
Innovation Solution
A scheduling apparatus and method that involves a first LTE base station and a second NR base station, where the first base station controls resource assignment patterns to reduce interference by determining UL and DL channel resources, allowing flexible implementation across various base station configurations with low complexity, and improving overall interference control in the communication system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation or dual/multi-connectivity technology is used to aggregate multiple frequency resources, then frequency use efficiency is improved, but intra-terminal interference signals occur that degrade terminal reception performance
Solution Approach 1:
The patent changes the resource assignment parameters by configuring different UL/DL resource assignment patterns between LTE and NR base stations. Specifically, it adjusts the timing relationships and resource allocation patterns to ensure that UL transmissions from one system do not overlap with DL receptions in the other system, thereby preventing inter-modulation distortion while maintaining frequency aggregation benefits
Solution Approach 2:
The patent introduces an interference management mechanism as an intermediary between LTE and NR base stations. This mechanism coordinates resource assignments between the two systems by having base stations share resource assignment information and configure complementary resource patterns, acting as a mediator to prevent harmful interference while maintaining both connections
2Reliability
If resource assignment patterns are configured to avoid interference, then terminal reception performance is improved, but scheduling flexibility and resource utilization may be reduced
Solution Approach 1:
The patent implements dynamic resource assignment where the UL/DL resource patterns are configured based on current system conditions and can be adjusted as needed. The base stations can dynamically select from multiple resource assignment patterns and modify timing relationships to adapt to changing traffic demands while maintaining interference avoidance, thus preserving scheduling flexibility
Solution Approach 2:
The patent segments the resource assignment into separate UL and DL resource patterns for LTE and NR systems. By dividing the resource allocation into distinct segments with coordinated timing relationships, the system achieves both interference avoidance and maintained scheduling flexibility for each individual system
Data Source
AI summary
A scheduling apparatus and a method for interference control in a mobile communication system supporting a carrier aggregation or dual connectivity or multi-connectivity technology in which a terminal uses a plurality of frequency resources at the same time are provided. Specifically, a first base station in a wireless communication system includes a transceiver and a processor connected to the transceiver and configured to obtain resource information of a second base station transmitted by the second base station, determine a resource assignment pattern based on the resource information of the second base station, assign uplink (UL) resources of the LTE base station for an UL channel based on the resource assignment pattern to reduce interference, and assign uplink (UL) resources of the first base station for an UL channel based on the resource assignment pattern to reduce interference.