Distributed Antenna System Channel Status Feedback
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Solution Overview
Problem
In conventional mobile communication systems, user equipment (UE) located far from the center of a cell experiences lower data rates due to concentrated antennas, making it difficult to provide high-speed services effectively.
Innovation Solution
A method is introduced to configure a Distributed Antenna System (DAS) that supports LTE-A, allowing for efficient transmission and reception of channel status information by using both central and distributed antennas, enabling UE to select the best antenna port for high-speed data services based on channel quality indicators and other metrics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If antennas are concentrated at the center of the cell (Central Antenna System), then device complexity is reduced and ease of operation is improved, but data rate for user equipment located far from the center deteriorates
Solution Approach 1:
The patent segments the antenna system into multiple distributed antenna ports (first antenna port, second antenna port, etc.) located at different positions within the cell. Each antenna port can independently serve user equipment, allowing UEs far from the center to connect to nearby antenna ports and achieve high data rates, while the centralized control of the base station maintains operational simplicity.
2Productivity
If multiple antenna ports are distributed throughout the cell, then data rate for remote user equipment is improved, but channel status information feedback complexity increases
Solution Approach 1:
The patent implements partial feedback by having user equipment report channel status information only for a selected subset of antenna ports rather than all antenna ports. The UE selects one or more antenna ports with the best channel conditions and provides feedback only for those ports, reducing feedback complexity while maintaining high data rates through optimal antenna selection.
Solution Approach 2:
The base station performs preliminary action by determining a specific feedback mode for the UE before channel status feedback is transmitted. The feedback mode indicates whether the UE should report channel status for all antenna ports or only for selected antenna ports, allowing the system to adapt the feedback complexity in advance based on channel conditions and service requirements.
3Measurement precision
If channel status information is reported for all antenna ports, then measurement precision is improved, but loss of information bandwidth increases
Solution Approach 1:
The patent extracts only the essential channel status information from the complete set of antenna ports. Instead of reporting channel status for all antenna ports, the UE selects the antenna port(s) with the best channel conditions and reports channel status information only for those selected ports. This extraction approach maintains measurement precision for the most relevant ports while significantly reducing the quantity of feedback information.
Data Source
AI summary
Disclosed is a method by a terminal in a mobile communication system including receiving, from a base station, CSI measurement configuration information for a serving cell, measuring a first reference signal for obtaining reference signal received power (RSRP) information based on the first CSI configuration information related to the RSRP for the physical layer signaling, transmitting the RSRP information to the base station through the physical layer signaling, measuring a second reference signal for obtaining CSI, and transmitting the CSI to the base station, the first CSI configuration information including information indicating whether to use group based reporting for the RSRP information, and the first CSI configuration information including information indicating a number of antenna ports for the RSRP information when the group based reporting is not configured for the RSRP information.