UE-Assisted Inter-Sector Interference Avoidance in MU-MIMO Networks
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Solution Overview
Problem
Current wireless communication systems, particularly in 5G and LTE networks, face challenges in reducing inter-sector interference due to beamformed transmissions, which affect the quality of service for user equipment (UEs) across different sectors.
Innovation Solution
The implementation of a method where user equipment (UEs) provide feedback reports to base stations (BSs) on inter-sector interference, allowing the BSs to adjust beam parameters, such as transmit power, to mitigate interference. This involves multi-user multiple-input and multiple-output (MU-MIMO) mode operations and sector control to minimize interference between different sectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If beamformed transmissions are used in MU-MIMO mode to serve multiple UEs simultaneously, then system capacity and spectral efficiency are improved, but inter-sector interference is introduced and worsened
Solution Approach 1:
The patent implements a feedback mechanism where UEs report inter-sector interference measurements to the network. The network uses this feedback information to adjust beamforming parameters and scheduling decisions, thereby reducing inter-sector interference while maintaining high system capacity through continuous monitoring and adaptation.
Solution Approach 2:
The patent dynamically adjusts beamforming parameters such as beam direction, beam width, and transmit power based on interference conditions. By changing these parameters in response to feedback, the system optimizes the balance between serving multiple UEs simultaneously and minimizing inter-sector interference.
2Reliability
If transmit power is increased to improve signal strength for UEs, then communication quality is improved, but inter-sector interference is intensified
Solution Approach 1:
The patent applies different transmit power levels and beamforming characteristics to different spatial sectors based on local interference conditions. Instead of uniform high power transmission, the system adjusts power locally in each sector to achieve reliable communication while minimizing interference to other sectors.
Solution Approach 2:
The transmit power is dynamically adjusted based on real-time interference measurements and feedback. The system transitions between different power levels and beamforming configurations to adapt to changing network conditions, ensuring optimal communication quality without causing excessive inter-sector interference.
3Use of energy by moving object
If beamforming is used to direct transmissions to specific UEs, then energy efficiency is improved, but interference to other sectors is concentrated and worsened
Solution Approach 1:
The patent introduces interference measurement and feedback as an intermediary mechanism between transmission and reception. This intermediary system allows the network to detect and quantify inter-sector interference, enabling corrective actions that balance energy efficiency with interference mitigation through coordinated beamforming adjustments.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for reducing inter-sector interference. A method generally includes transmitting, in a multi-user multiple-input and multiple-output (MU-MIMO) mode, first beamformed transmissions using a first beam to a first user equipment (UE) in a first sector and second beamformed transmissions using a second beam to a second UE in a second sector, wherein the BS is configured to control a plurality of sectors comprising the first sector and the second sector, receiving, from the first UE, a feedback report indicating inter-sector interference encountered by the first UE in the first sector due to the second beamformed transmissions, and taking one or more actions based on the feedback report to reduce the inter-sector interference encountered by the first UE in the first sector.