Precoding Section for Multi-Site MIMO Beam Control
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Solution Overview
Problem
Beam control in multi-site environments with multiple Massive MIMO base stations is not adequately addressed, leading to inefficiencies in signal transmission and interference management.
Innovation Solution
A radio base station system that performs precoding and beam-forming based on channel information, including inter-user and inter-stream interference, and extends precoding to account for channels between base stations, enabling effective beam control across multiple sites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If Massive MIMO is used in high frequency bands to increase data rate and reduce interference, then transmission speed is improved, but beam control in multi-site environments becomes insufficient
Solution Approach 1:
The patent segments the beam control process into two distinct stages: first, site-specific precoding is applied at each base station based on local channel information; second, inter-site interference coordination is performed using extended channel information from neighboring base stations. This segmentation allows each stage to optimize for its specific function while collectively achieving both high speed and reliable beam control in multi-site environments.
2Device complexity
If precoding is applied based on channel information between base station and connected user terminal only, then precoding complexity is reduced, but beam control accuracy in multi-site environments deteriorates
Solution Approach 1:
The patent implements preliminary action by having neighboring base stations pre-share their channel information with the serving base station before precoding is applied. This extended channel information is stored and prepared in advance, allowing the precoding algorithm to incorporate inter-site interference considerations without significantly increasing real-time computational complexity, thus maintaining beam control accuracy in multi-site environments.
Data Source
AI summary
Radio base station 10 in a radio communication system that performs MIMO transmission between a plurality of radio base stations and at least one user terminal 20 includes: precoding section 110 that applies precoding to data signals based on channel information indicating channels between radio base stations 10 and the user terminal; and communication section 112 that transmits the precoded data signals, in which the precoding in a first radio base station of the plurality of radio base stations is applied based on the channel information including at least a channel between the first radio base station and a first user terminal connected to a second radio base station other than the first radio base station.