CSI-RS Timing Coordination in LTE Base Stations
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Solution Overview
Problem
In LTE Release-10, the timing for starting the transmission and muting of CSI-RS is not defined, which affects the accurate channel estimation between neighboring cells.
Innovation Solution
A mobile communication method where a radio base station notifies a mobile station of CSI-RS/Muting configuration information and starts downlink data transmission in a subframe after receiving a response to the connection reconfiguration signal, ensuring appropriate timing for CSI-RS transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If CSI-RS transmission timing is not defined, then the system flexibility is maintained, but the channel estimation accuracy between neighboring cells deteriorates
Solution Approach 1:
The patent applies preliminary action by defining the CSI-RS transmission start timing in advance through configuration information (specific subframe offsets and periodicities) that is notified to the mobile station before actual transmission begins. This allows the system to establish a predetermined timing pattern that ensures accurate channel estimation between neighboring cells while avoiding the complexity of dynamic timing negotiation.
2Productivity
If downlink data transmission starts immediately after connection reconfiguration, then the data transmission efficiency is improved, but the CSI-RS transmission timing coordination deteriorates
Solution Approach 1:
The patent applies feedback by requiring the mobile station to send an acknowledgment (ACK) for the connection reconfiguration message before the base station begins downlink data transmission in subframes containing CSI-RS. This feedback mechanism ensures that both the base station and mobile station are synchronized regarding the CSI-RS transmission timing, maintaining reliable coordination while enabling efficient data transmission once synchronization is confirmed.
Data Source
AI summary
A mobile communication method according to the present invention includes a step A of notifying, by a radio base station eNB, a mobile station UE during communication in a subordinate cell #1 of “CSI-RS/Muting configuration information” indicating a transmission method of CSI-RS; and a step B of performing, by the mobile station UE, a reception process on the basis of the “CSI-RS/Muting configuration information”.