Dual-Path Radio Communication With Reception-State Feedback
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Solution Overview
Problem
In dual connectivity scenarios of radio communication systems, switching from dual connectivity to single connectivity can lead to data duplication or loss due to inconsistent user data transmission and reception, particularly in downlink and uplink communications.
Innovation Solution
A radio communication device and method that includes a reception unit to receive data via multiple paths, a control unit to manage communication states, and a transmission unit to transmit reception state information for consistent data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If dual connectivity is used to increase transmission capacity, then system capacity is improved, but data consistency deteriorates due to duplication or loss during connectivity switches
Solution Approach 1:
The patent implements feedback mechanisms where the mobile station reports reception state information (such as PDCP status reports indicating received and missing packets) to the base station. This feedback enables the base station to track which data packets have been successfully received and which are missing, allowing it to adjust transmission strategies accordingly and prevent data duplication or loss during connectivity switches between macro and small cells
Solution Approach 2:
The patent employs preliminary actions by maintaining data transmission through both macro cell and small cell simultaneously before a handover is complete. The base station pre-configures dual connectivity paths and prepares data routing in advance, ensuring that data transmission continues uninterrupted while the mobile station switches connectivity, thereby preventing data loss during the transition
2Productivity
If data is transmitted through multiple paths (macro cell and small cell), then transmission capacity is improved, but data duplication occurs due to inconsistent reception state tracking
Solution Approach 1:
The mobile station provides detailed reception state information including PDCP sequence numbers of received and missing packets to the base station. This feedback mechanism allows the base station to identify which packets have been successfully received through either the macro cell or small cell path, enabling it to stop transmitting duplicate packets and prevent data duplication during dual connectivity operation
Solution Approach 2:
The base station acts as an intermediary that coordinates data transmission between the macro cell and small cell paths. It receives reception state information from the mobile station and uses this information to control and coordinate data transmission through both paths, ensuring that the same data is not transmitted through both paths simultaneously and thereby preventing data duplication
3Productivity
If connectivity switching is performed to optimize communication, then communication efficiency is improved, but data loss occurs due to inconsistent transmission state
Solution Approach 1:
The base station maintains data transmission through both macro cell and small cell simultaneously before a handover is complete. It pre-configures dual connectivity paths and prepares data routing in advance, ensuring that data transmission continues uninterrupted while the mobile station switches connectivity, thereby preventing data loss during the transition
Solution Approach 2:
The mobile station reports reception state information (such as PDCP status reports indicating received and missing packets) to the base station. This feedback enables the base station to track which data packets have been successfully received and which are missing, allowing it to adjust transmission strategies accordingly and prevent data loss during connectivity switches
Data Source
AI summary
A radio communication device includes a reception unit that receives a part of data transmitted from a first communication device, via a first path including a radio channel between the radio communication device and the first communication device and that receives another part of data transmitted from the first communication device, via a second path that goes through a second communication device; a control unit that performs communication control in accordance with a state of data communication performed via the second path; and a transmission unit that transmits, to the first communication device via the first path by using control performed by the control unit in accordance with the state of the data communication performed via the second path, reception state information that specifies data that has been received or data that has not been received by the reception unit.