Beam Index Feedback Reduces Signaling Overhead in Massive MIMO
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Solution Overview
Problem
Current beam feedback methods in wireless communication systems, such as Full Dimensional MIMO and Massive MIMO, require transmission of grouping information to indicate beam feedback, leading to increased signaling overhead.
Innovation Solution
A method where a user equipment determines a first beam and multiple second beams based on beam selection, transmits beam indexes to a base station according to beam power, and corresponds wideband and subband beam information to these indexes, allowing the base station to obtain required information without explicit grouping information transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If grouping information is transmitted to indicate beam feedback, then beam information can be accurately fed back, but signaling overhead increases
Solution Approach 1:
The patent extracts and removes the grouping information transmission step from the beam feedback process. Instead of transmitting grouping information to indicate beam feedback, the system directly transmits beam indication information (such as beam indices or beam precoding matrix indicators) that can be directly interpreted by the base station, thereby eliminating unnecessary signaling overhead while maintaining feedback accuracy
Solution Approach 2:
The user equipment performs self-service by determining beam information based on its own channel measurements and beam management procedures. The UE selects beams from a codebook, determines corresponding beam indication information, and feeds this back to the base station without requiring the base station to provide grouping information or configuration, thereby simplifying the overall signaling process
2Productivity
If more beams are used for data transmission, then communication throughput is improved, but beam information feedback complexity increases
Solution Approach 1:
The patent segments the large codebook into multiple subcodebooks or beam groups, each corresponding to different spatial directions or transmission scenarios. The user equipment selects beams from these segmented groups based on channel conditions, and the base station can manage multiple beams efficiently by organizing them in segments, thereby reducing feedback complexity while supporting high throughput
Solution Approach 2:
The patent introduces a new dimension for beam management by using beam indication information that includes both beam group indicators and beam index indicators. This multi-dimensional approach allows the system to manage a large number of beams systematically, where the first dimension represents beam groups and the second dimension represents specific beams within groups, simplifying the feedback structure
Data Source
AI summary
Provided is a beam information feedback method performed by a user equipment, comprising: determining a first beam and a plurality of second beams according to a beam selection result; transmitting beam indexes of the plurality of second beams to a base station according to the beam power of the plurality of second beams; transmitting wideband beam information correspondingly to the beam indexes of the plurality of second beams; and transmitting subband beam information correspondingly to the beam indexes of the plurality of second beams.