Simultaneous Connectivity Handover for SN/HFN Data Continuity
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Solution Overview
Problem
Existing technologies face challenges in ensuring sequence number (SN) assignment and continuity during simultaneous connectivity based handover in wireless communication, particularly for radio link control acknowledged mode (RLC AM) and unacknowledged mode (UM), leading to data transmission disruptions.
Innovation Solution
A method for determining and transmitting SN and hyper frame number (HFN) information between network devices during handover, ensuring continuous data transmission by maintaining simultaneous connections with both source and target network devices, and managing SN and HFN assignments to maintain data order and continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If simultaneous connectivity based handover is implemented to reduce data interruption, then data transmission continuity is improved, but sequence number assignment and management complexity increases
Solution Approach 1:
The source network device acts as an intermediary by determining and providing SN/HFN information to the target network device, which then uses this information for correct SN assignment and data transmission during handover, resolving the complexity of simultaneous SN management across both network devices
Solution Approach 2:
The source network device determines the first set of SDUs and their corresponding SN/HFN information before the handover is complete, and provides this information to the target network device in advance, enabling the target to correctly assign and transmit SDUs without interruption once connectivity is established
2Productivity
If SN assignment is performed during simultaneous connectivity handover, then data transmission is maintained, but determining correct data order becomes more difficult
Solution Approach 1:
The source network device provides feedback to the target network device by determining and transmitting the first information about SN and HFN for each SDU, enabling the target to correctly order and transmit data packets during simultaneous connectivity handover without loss of transmission rate
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and computer readable media for data transmission during simultaneous connectivity based handover. A method of communication comprises in response to a second connection being established between a second network device and a terminal device having a first connection with a first network device, determining, at the first network device, a first set of SDUs to be transmitted by the second network device to the terminal device; determining first information regarding a SN assigned to each of the first set of SDUs and a HFN associated with the SN; and transmitting the first set of SDUs and the first information to the second network device. The method further comprises receiving, at the second network device, the first set of SDUs and first information; and transmitting the first set of SDUs to the terminal device based on the first information. The method further comprises receiving, at the terminal device, a first set of PDUs corresponding to the first set of SDUs from the second network device; receiving a second set of PDUs corresponding to the second set of SDUs from the first network device; determining the first information; and determining an order of the first and second sets of PDUs based on the first information. Embodiments of the present disclosure can facilitate correct data transmission during a simultaneous connectivity based handover and improve data transmission efficiency.