UE Feedback Transmission in Distributed Antenna Systems
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Solution Overview
Problem
Current communication standards designed for centralized antenna systems cannot effectively support advanced MIMO techniques in distributed antenna systems, leading to inefficiencies in antenna allocation and feedback information transmission for user equipment (UE) in distributed antenna systems.
Innovation Solution
A method for transmitting feedback information from user equipment (UE) to a base station in a distributed antenna system, involving the transmission of first feedback information for antenna allocation and second feedback information on channel state, using normalized values and specific metrics like channel coefficients and sounding reference signal power, to optimize antenna allocation and resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If communication standards designed for centralized antenna systems are used in distributed antenna systems, then system compatibility is maintained, but antenna allocation efficiency and MIMO technique performance deteriorate
Solution Approach 1:
The patent modifies feedback information parameters by introducing two distinct feedback mechanisms: first feedback information for antenna allocation (including channel quality indicators and antenna preference) and second feedback information for resource allocation (including channel state information). This parameter differentiation enables distributed antenna systems to operate efficiently while maintaining compatibility with existing communication standards.
2Loss of information
If multiple feedback information types are transmitted simultaneously, then comprehensive channel information is provided, but feedback overhead increases
Solution Approach 1:
The patent segments feedback information into two distinct types transmitted at different times: first feedback information (antenna allocation feedback) and second feedback information (resource allocation feedback). This segmentation reduces simultaneous feedback overhead while ensuring comprehensive channel information is provided through sequential transmission, resolving the contradiction between information completeness and overhead reduction.
Data Source
AI summary
Provided is a method for transmitting feedback information of a UE in a distributed antenna system in which a plurality of antennas are distributedly disposed within a cell is provided. The method includes transmitting first feedback information used for a base station (BS) to allocate at least one of a plurality of antennas to a UE, to the BS; receiving antenna allocation information determined based on the first feedback information from the BS; and transmitting second feedback information indicating a channel state with respect to an antenna allocated according to the antenna allocation information to the BS.