Beam Feedback Flag for 5G MIMO Overhead Reduction
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Solution Overview
Problem
In 5G communication systems, selecting the best beam combination for beamforming MIMO wireless communication systems is complex and results in high overhead, particularly in mobile environments, leading to performance deterioration and increased latency.
Innovation Solution
A method and device that minimize complexity and overhead by selecting and feedback on beam combinations, using a flag bit to indicate if the selected beam is identical to the previous best beam, and performing inter-beam handover in subsequent frames, thereby reducing processing time and maintaining stable data rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the best beam combination is selected from multiple transmission/reception beam combinations, then the communication performance is improved, but the complexity and feedback overhead increase
Solution Approach 1:
The patent segments the beam selection process into two stages: first selecting transmission beams independently for each antenna port, then selecting reception beams. This segmentation reduces the overall complexity by breaking down the combinatorial optimization problem into smaller, more manageable sub-problems, while still achieving near-optimal communication performance
Solution Approach 2:
The patent applies partial action by selecting only the top N beam combinations (where N is a configurable parameter) rather than evaluating all possible combinations. This partial evaluation approach significantly reduces computational complexity while maintaining performance close to the optimal full evaluation
2Reliability
If the best beam combination is selected and fed back, then the communication performance is improved, but the feedback overhead increases
Solution Approach 1:
The patent extracts and feeds back only the essential information needed for beam selection - specifically the indices of selected transmission and reception beams - rather than feeding back complete channel state information. This extraction approach significantly reduces feedback overhead while maintaining the ability to achieve optimal beam selection
Solution Approach 2:
The patent feeds back partial information by reporting only the top N beam combination indices rather than all possible combinations. This partial feedback approach reduces the feedback overhead to a manageable level while providing sufficient information for the transmitter to select the optimal beam combination
Data Source
AI summary
Disclosed is a 5th generation (5G) or pre-5G communication system to be provided for supporting a data transmission rate higher than that of a 4th generation (4G) communication system such as long term evolution (LTE). Examples of the present invention provide a beam selection and feedback device and method for minimizing complexity and overhead without performance deterioration in a beamforming MIMO wireless communication system. According to one example of the present invention, an apparatus of a receiving device in a wireless communication system comprises: a transceiver; and at least one processor, wherein the at least one processor is configured to: select at least one beam pair from among a plurality of transmission/reception beam pairs, and control the transceiver to transmit feedback information including indication information indicating whether the at least one beam pair is identical to a beam pair selected in a previous beamforming procedure.