Opportunistic Beamforming with Selective Beam Attenuation
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Solution Overview
Problem
Existing communication systems face interference issues due to alternating transmission beams, which affect signal quality and throughput in MIMO schemes, particularly in LTE and LTE-Advanced systems, where opportunistic beam-forming techniques do not proactively address interference effectively.
Innovation Solution
A method and system where receivers identify interfering transmission beams and send feedback to transmitters to attenuate these beams during the transmission of preferred beams, ensuring high signal quality and throughput by coordinating beam patterns and scheduling among multiple transmitters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple transmission beams are transmitted simultaneously to achieve high throughput, then productivity is improved, but interference between beams degrades signal quality
Solution Approach 1:
The receiver performs preliminary measurements of signal quality on multiple transmission beams before selecting the preferred beam. This preliminary action allows the system to identify and report the best beam in advance, enabling the transmitter to pre-coordinate beam attenuation patterns to avoid interference while maintaining high throughput
Solution Approach 2:
The receiver measures signal quality on received transmission beams and sends feedback to the transmitter indicating the preferred beam and timing. This feedback mechanism enables the transmitter to adjust beam attenuation dynamically, resolving the contradiction between maintaining multiple beams for high throughput and avoiding interference for signal quality
2Object-affected harmful factors
If beam attenuation is applied to reduce interference, then signal quality is improved, but system complexity increases due to coordination requirements
Solution Approach 1:
Instead of uniformly attenuating all beams, the system applies selective attenuation only to specific beams at specific timing based on receiver feedback. This local quality approach minimizes the complexity of coordination while effectively reducing interference, as only necessary beam adjustments are made rather than system-wide changes
3Object-affected harmful factors
If beam patterns are coordinated among transmitters to reduce interference, then signal quality is improved, but communication overhead increases
Solution Approach 1:
The receiver reports only the preferred beam and timing information rather than complete signal quality measurements for all beams. This partial action approach reduces communication overhead while still providing sufficient information for the transmitter to coordinate beam attenuation effectively, avoiding the need to transmit excessive data
Data Source
AI summary
A method for communication includes receiving at a receiver from a group of two or more transmitters multiple Radio Frequency (RF) transmission beams that alternate in time and space and include at least first and second transmission beams. The method identifies that the first transmission beam causes interference to reception of the second transmission beam. Feedback is sent from the receiver to one or more of the transmitters, so as to cause the transmitters to attenuate the first transmission beam during transmission of the second transmission beam.