Terminal DRX Configuration for Handover Channel State Reporting
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Solution Overview
Problem
In mobile communication systems, particularly during handovers, terminals often fail to acquire correct information from target cells due to significant interference from neighboring cells, leading to handover failures.
Innovation Solution
A method and apparatus that allow terminals to efficiently acquire and transmit channel state information by receiving Discontinuous Reception (DRX) configuration from the base station, determining the appropriate time for transmission based on DRX operation, and skipping unnecessary transmissions to mitigate interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal continuously transmits channel state information during handover, then the target cell can acquire information for handover operation, but the transmission may fail due to significant interference from neighboring cells
Solution Approach 1:
The terminal performs measurements and acquires channel state information of the target cell before the handover is executed. This preliminary acquisition ensures that the target cell has the necessary information ready when handover occurs, reducing the impact of interference during the critical handover moment.
Solution Approach 2:
The terminal dynamically adjusts its transmission behavior based on DRX configuration. During on-duration periods, the terminal transmits channel state information; during off-duration periods, it skips transmission. This dynamic adjustment optimizes the balance between information acquisition and interference mitigation.
2Loss of information
If the terminal transmits channel state information during off-duration of DRX operation, then more information is provided for handover, but unnecessary transmissions increase interference and waste energy
Solution Approach 1:
The terminal transmits channel state information periodically during on-duration periods of DRX operation, and skips transmission during off-duration periods. This periodic transmission pattern reduces overall interference while ensuring information is provided at appropriate intervals for handover operations.
Solution Approach 2:
The DRX off-duration periods, which would normally be times of no transmission, are utilized to reduce interference. By skipping transmissions during off-duration, the terminal converts what would be interference-generating activity into an interference-reducing action, benefiting both the target cell and neighboring cells.
Data Source
AI summary
A method for transmitting a channel state by a terminal in a communication system, according to one embodiment, comprises the steps of: receiving discontinuous reception (DRX) configuration information from a base station; determining whether the terminal is set to transmit channel state information only in onDuration according to a DRX operation; determining whether an arbitrary subframe to be received is a subframe included in onDuration if the terminal is set to transmit the channel state information only in onDuration according to the configuration; and not transmitting the channel state information on the arbitrary subframe if the arbitrary subframe is not a subframe included in onDuration. According to the embodiment, the terminal can efficiently report channel state information.