Uplink Power Control in Distributed Antenna Systems
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Solution Overview
Problem
Current communication standards are designed for centralized antenna systems and cannot be directly applied to distributed antenna systems, which require advanced MIMO techniques for efficient signal transmission and reception, especially for SU-MIMO and MU-MIMO in both uplink and downlink scenarios.
Innovation Solution
A method for a terminal in a distributed antenna system that involves receiving uplink and downlink antenna information from the base station, controlling uplink power based on this information, and transmitting signals using the appropriate antenna groups, while also generating downlink channel state information to optimize signal transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If communication standards designed for centralized antenna systems are applied to distributed antenna systems, then system compatibility is maintained, but MIMO transmission performance and communication efficiency deteriorate
Solution Approach 1:
The patent applies local quality by configuring different antenna information for different antenna groups within the distributed antenna system. Each antenna group has specific uplink antenna information indicating which antenna should receive uplink signals, allowing localized optimization of signal transmission and reception characteristics for MIMO operations while maintaining overall system compatibility
Solution Approach 2:
The patent implements dynamics by enabling the base station to dynamically configure and update uplink antenna information for different antenna groups based on channel conditions and traffic requirements. This allows the system to adaptively optimize MIMO transmission performance while maintaining compatibility with existing communication standards through dynamic reconfiguration rather than static design
2Reliability
If uplink power is controlled based on uplink antenna information in DAS, then signal reception quality at specific antennas is improved, but system complexity increases
Solution Approach 1:
The patent uses uplink antenna information as an intermediary parameter that the base station provides to user equipment. This intermediary carries essential configuration data about which antenna should receive uplink signals, enabling power control optimization without requiring complex direct measurements or feedback mechanisms between distributed antennas and user equipment
Solution Approach 2:
The patent applies preliminary action by having the base station pre-configure and transmit uplink antenna information to user equipment before uplink transmission occurs. This allows user equipment to perform accurate power control in advance based on the indicated receiving antenna characteristics, improving signal quality while avoiding complex real-time adjustments during transmission
Data Source
AI summary
A method in which user equipment transmits a signal in a distributed antenna system in which a plurality of antennas is distributed in a cell, comprises the following steps: receiving uplink antenna information from a base station; controlling uplink power on the basis of the uplink antenna information; and transmitting an uplink signal on the basis of the uplink power control, wherein the uplink antenna information indicates a receiving antenna of the base station that receives the uplink signal.