Crosslink Interference Measurement in 5G TDD Systems
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Solution Overview
Problem
In the 5G NR communication system, there is a significant challenge in efficiently measuring interference between downlink and uplink signals across different cells, particularly when base stations are closely located and use different TDD configurations, leading to increased interference due to spatial multiplexing with directional beams.
Innovation Solution
A communication device and method that acquires and notifies information for measuring interference between downlink and uplink signals across different cells by exchanging information between base stations and terminal devices, allowing for more accurate interference measurement and reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If base stations in adjacent cells are installed closer to each other to increase spatial multiplexing capacity, then communication throughput is improved, but crosslink interference between uplink and downlink signals increases
Solution Approach 1:
The patent applies preliminary action by having the base station proactively acquire and notify terminal devices of interference measurement information before interference occurs. The base station obtains uplink signal information from other cells, determines interference measurement settings, and notifies terminal devices in advance, enabling them to measure and report interference levels before actual downlink transmission, thus allowing proactive interference management while maintaining close base station spacing for spatial multiplexing
2Reliability
If terminal devices measure interference from uplink signals in other cells, then interference mitigation is improved, but device complexity and measurement overhead increase
Solution Approach 1:
The patent uses the base station as an intermediary that mediates between other base stations and terminal devices. The base station acquires uplink signal information from other base stations, processes this information to determine interference measurement settings, and then notifies terminal devices. This intermediary approach simplifies terminal device complexity as they only need to follow base station instructions for measurement rather than independently acquiring information from multiple sources
Solution Approach 2:
The patent applies parameter changes by dynamically configuring interference measurement parameters based on actual interference conditions. The base station determines measurement bandwidth, measurement resources, and other parameters based on the acquired uplink signal information from other cells, allowing flexible adjustment of measurement overhead to match actual interference levels rather than using fixed high-overhead measurements
Data Source
AI summary
[Problem] To enable measurement of interference between a downlink signal and an uplink signal transmitted in different cells in a more suitable manner.[Solution] A communication device includes a communication unit that performs wireless communication with a first terminal device located within a communication range, an acquisition unit that acquires, from another base station, first information related to a second terminal device located within a communication range of the other base station, and a notification unit that notifies the first terminal device of second information for measuring interference of an uplink signal transmitted from the second terminal device to the other base station with a downlink signal transmitted to the first terminal device, based on the acquired first information.