Beam Restricted Sub-Frame Transmission for Interference Mitigation
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Solution Overview
Problem
Current beamforming systems face challenges in minimizing interference between neighbor cells and heterogeneous cells, particularly in high-speed and high-capacity wireless communication systems, where efficient data transmission and reception are hindered by the need for precise beam steering and power management.
Innovation Solution
The implementation of a method and apparatus that transmit and receive beam restricted sub-frames using a base station, where configuration information is sent to user terminals to limit the beam subsets used for specific sub-frames, allowing for efficient data transmission by restricting the beam subset used in certain sub-frames, thereby reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If beamforming is used to concentrate energy in desired directions, then signal strength and transmission speed are improved, but interference between neighbor cells and heterogeneous cells increases
Solution Approach 1:
The patent segments the beamforming transmission into two distinct types: beam restricted sub-frames that use only a first beam subset with restricted directions, and normal sub-frames that can use a second beam subset with broader beam directions. This segmentation allows the system to achieve high transmission speed in normal sub-frames while minimizing interference in beam restricted sub-frames, thereby resolving the contradiction between transmission speed and inter-cell interference.
2Productivity
If full beam subsets are used in all sub-frames, then data transmission capacity is maximized, but interference mitigation between cells becomes difficult
Solution Approach 1:
The patent applies local quality by assigning different beam subset characteristics to different sub-frames based on local interference conditions. Beam restricted sub-frames use a first beam subset with restricted beam directions specifically designed to avoid interfering with neighbor cells, while normal sub-frames use a second beam subset that maximizes data transmission capacity. This localized adaptation of beam quality allows the system to maintain high overall productivity while effectively mitigating interference in specific locations and time periods.
3Object-generated harmful factors
If beam directions are restricted in certain sub-frames, then interference is reduced, but transmission efficiency in those sub-frames decreases
Solution Approach 1:
The patent implements periodic action by alternating between beam restricted sub-frames and normal sub-frames in a configured pattern. The base station transmits configuration information indicating which sub-frames are beam restricted sub-frames, creating a periodic structure where interference mitigation and high-efficiency transmission are alternately applied. This periodic alternation ensures that while transmission efficiency is temporarily reduced in beam restricted sub-frames, the overall system productivity is maintained through the high-capacity normal sub-frames, achieving a balanced resolution of the contradiction.
Data Source
AI summary
The method comprises: a step in which the base station transmits to a terminal configuration information related to the beam restricted sub-frame; and a step in which the base station transmits downlink data to the terminal via a sub-frame. The sub-frame includes the beam restricted sub-frame and a normal sub-frame, setting information includes information indicating a sub-frame set as the beam restricted sub-frame among multiple sub-frames, the beam restricted sub-frame is a sub-frame transmitted only based on a first beam subset, the normal sub-frame is a sub-frame transmitted based on the first beam subset and a second beam subset, the first beam subset is the set of beams generated based on a first precoding matrix set, and the second beam subset is the set of beams generated based on a second precoding matrix set including the first precoding matrix set.