Status Data Unit Enhancement for Packet Retransmission in Handover
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Solution Overview
Problem
Current wireless communication systems, particularly in LTE and NR networks, face challenges in ensuring seamless handovers between cells, leading to potential data packet losses and decoding failures due to missing packets, which affect communication reliability and efficiency.
Innovation Solution
The implementation of a method and system for wireless communications that involves receiving packets from a source cell, performing a handover to a target cell, determining missing packets, and requesting retransmissions from the target cell using a dual-active protocol stack (DAPS) approach, ensuring continuous communication and packet integrity during the handover process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a handover is performed from source cell to target cell, then mobility and continuity of communication is improved, but packet loss and decoding failures occur due to missing packets during handover
Solution Approach 1:
The patent applies preliminary action by sending status information about received and decoded packets before the handover is complete. The UE provides the target cell with information about which packets have been successfully decoded and which are still pending, enabling the target cell to proactively retransmit missing packets during the handover process rather than waiting for failures to occur
Solution Approach 2:
The patent implements feedback mechanisms where the UE continuously reports packet reception and decoding status to the serving cell. This feedback loop allows the network to identify missing packets and trigger retransmissions from either the source or target cell, ensuring reliable packet delivery despite the handover transition
2Reliability
If packets are retransmitted from source cell during handover, then packet loss is reduced, but handover latency and complexity increase
Solution Approach 1:
The patent uses preliminary action by having the UE report decoding status before handover completion, allowing the target cell to prepare and send retransmissions in advance. This proactive approach reduces the need for multiple retransmission rounds during and after handover, thereby reducing overall handover latency
Solution Approach 2:
The patent introduces the target cell as an intermediary that receives status information from the UE and coordinates retransmissions. The target cell acts as a mediator between the source cell and UE, managing the retransmission process efficiently without requiring the UE to maintain prolonged connectivity with the source cell, thus reducing handover latency
Data Source
AI summary
Certain aspects of the present disclosure are directed to a method for wireless communication. The method generally includes receiving at least one first packet of a sequence of packets from a source cell, the at least one first packet being dependent on at least one second packet of the sequence of packets for decoding, performing a handover from the source cell to a target cell, determining that the at least one second packet of the sequence of packets was not received from the source cell, generating a message requesting a retransmission from the target cell for the at least one first packet and the at least one second packet based on the determination, and transmitting the message to the target cell.