Base Station Channel State Information Acquisition via Inverted Feedback
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Solution Overview
Problem
In wireless communications, the existing methods for obtaining channel state information in large-scale multi-input multi-output systems result in low system capacity and increased overheads, particularly as the number of antennas increases, due to the need for frequent channel estimation and feedback in frequency division duplex systems.
Innovation Solution
A method and device where a base station determines a special timeslot for downlink data transmission, configures user equipment to send an uplink physical signal over a downlink frequency band within this timeslot, and receives the signal to obtain channel state information, reducing system overheads by reversing the typical feedback process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If terminal performs channel estimation and feeds back measurement results to base station, then channel state information can be obtained, but system capacity is low and system overheads increase dramatically as quantity of antennas increases
Solution Approach 1:
The patent inverts the traditional feedback direction by having the base station send uplink reference signals to terminals, which then feed back channel state information directly to the base station. This reversal eliminates the need for terminals to perform complex downlink channel estimation and feedback, dramatically reducing system overheads while maintaining channel state information accuracy even as antenna quantities increase
2Measurement precision
If terminal performs channel estimation and feeds back measurement results to base station, then channel state information can be obtained, but system overheads increase dramatically as quantity of antennas increases
Solution Approach 1:
The patent inverts the traditional feedback direction by having the base station send uplink reference signals to terminals, which then feed back channel state information directly to the base station. This reversal eliminates the need for terminals to perform complex downlink channel estimation and feedback, dramatically reducing system overheads while maintaining channel state information accuracy even as antenna quantities increase
Solution Approach 2:
The patent extracts the channel estimation function from the terminal side and relocates it to the base station side. The base station performs channel estimation directly on the feedback signals received from terminals, eliminating the need for terminals to perform complex channel estimation calculations and reduce feedback overhead
Data Source
AI summary
Embodiments of the present invention provide a channel state information obtaining method and a device, where the method includes: determining, by a base station according to radio resource usage, a special timeslot in a frequency range used for downlink data transmission; sending special-timeslot configuration information to user equipment, where the special-timeslot configuration information is used to configure the user equipment to send the uplink physical signal over a downlink frequency band in the special timeslot; and performing channel estimation according to the uplink physical signal after receiving the uplink physical signal sent by the user equipment, to obtain channel state information. Compared with a technical solution in the prior art in which user equipment obtains channel state information and then feeds back the channel state information to a base station, system overheads caused in obtaining, by the base station, the channel state information are reduced.