Base Station Spatial Multiplexing Compatibility Control
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Solution Overview
Problem
Current 3GPP specifications lack a scheme for appropriately performing Coordinated Beamforming-CoMP (CB-CoMP) in multi-antenna transmission, which affects the spatial multiplexing transmission between user terminals connected to different base stations.
Innovation Solution
A communication control method that calculates and compares statistics from precoder matrix information and downlink radio resource feedback from user terminals to determine compatibility for spatial multiplexing transmission, ensuring that only compatible pairs can perform CB-CoMP, thereby improving transmission performance and preventing performance deterioration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spatial multiplexing transmission is performed using the same radio resource and precoder matrix for user terminals connected to different base stations, then transmission efficiency is improved, but transmission reliability deteriorates due to incompatibility between user terminals
Solution Approach 1:
The invention performs preliminary compatibility determination by comparing statistics (such as channel quality indicators, precoder matrix indicators, and rank indicators) of user terminals before allocating the same radio resources. This preliminary action ensures that only compatible user terminals are selected for spatial multiplexing transmission, thereby maintaining transmission reliability while achieving high transmission efficiency.
Solution Approach 2:
The invention utilizes feedback information from user terminals (including channel state information, precoder matrix indicators, and rank indicators) to determine compatibility. By continuously monitoring and comparing these feedback parameters, the system can dynamically adjust resource allocation to maintain both transmission efficiency and reliability.
2Device complexity
If CB-CoMP is performed without compatibility determination between user terminals, then device complexity is reduced, but transmission performance deteriorates due to incompatibility
Solution Approach 1:
The invention changes the approach from complex real-time channel analysis to comparing predefined statistical parameters (such as CQI, PMI, RI values) of user terminals. This parameter-based compatibility determination simplifies the system complexity while ensuring transmission performance by identifying compatible user terminal pairs through statistical comparison.
3Reliability
If compatibility determination is performed for all user terminal pairs, then transmission reliability is improved, but processing time increases
Solution Approach 1:
The invention extracts and compares only the essential statistical parameters (CQI, PMI, RI) from the complete channel state information of user terminals. By focusing on these key parameters rather than analyzing all channel details, the system achieves reliable compatibility determination with minimal processing time.
Data Source
AI summary
A base station is connected to a first user terminal in a mobile communication system that performs spatial multiplexing transmission for the first user terminal and a second user terminal by applying a same radio resource and a same precoder matrix. The base station comprises: a control unit that notifies another base station connected to the second user terminal of a first statistic for each piece of first precoder matrix information fed back from the first user terminal and a second statistic for each downlink radio resource in the first user terminal.