Retransmitting Packets in Dual Connectivity Networks
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Solution Overview
Problem
In dual connectivity networks, the expiration of a reordering timer in user equipment can lead to massive data loss and a sharp decrease in transmission rate due to packet delays, as the equipment waits for missing packets and discards them upon timer expiration.
Innovation Solution
A method and apparatus that predict the expiration of the reordering timer by comparing the timer's expiration time with a threshold value, and use AI models trained on packet delivery state information from both cell groups to determine and retransmit packets before timer expiration, prioritizing retransmissions to prevent data loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the user equipment waits for missing packets using a reordering timer to ensure in-order delivery, then packet delivery reliability is improved, but data loss occurs when the timer expires without receiving the packet
Solution Approach 1:
The network side performs preliminary retransmission of packets that are predicted to cause reordering timer expiration. By proactively identifying packets that will not arrive before the timer expires and retransmitting them in advance, the system prevents data loss while maintaining in-order delivery reliability.
Solution Approach 2:
The system uses feedback from packet delivery state information to predict which packets will cause reordering timer expiration. This feedback mechanism enables the network to make informed decisions about which packets need retransmission, improving both reliability and reducing data loss.
2Stability of the object's composition
If the user equipment waits for missing packets using a reordering timer, then in-order packet processing is maintained, but transmission rate decreases due to waiting time
Solution Approach 1:
The network side performs preliminary retransmission of packets before the reordering timer expires. By proactively sending delayed packets in advance, the user equipment can maintain its reordering buffer without extended waiting periods, thus preserving in-order processing while reducing transmission delays and improving overall transmission rate.
3Productivity
If packets are transmitted via the second cell group to balance load, then network resource utilization is improved, but packet delivery delay increases causing reordering timer expiration
Solution Approach 1:
The system monitors packet delivery state information from both cell groups and uses this feedback to predict which packets transmitted via the second cell group will experience delays causing reordering timer expiration. This enables targeted retransmission decisions that compensate for the inherent delays of load-balanced transmission.
Solution Approach 2:
The system dynamically adjusts retransmission timing and selection based on observed packet delivery characteristics of different cell groups. By adapting retransmission parameters according to actual delivery performance, the system compensates for delays introduced by load-balanced transmission while maintaining efficient resource utilization.
Data Source
AI summary
Provided is a data transmission method including obtaining, from a core network (CN), at least one packet to be transmitted to a user equipment via a first cell group or a second cell group, determining a packet to be transmitted via the second cell group, among the at least one packet, transmitting the determined packet to the user equipment via the second cell group, obtaining packet delivery state information of the first cell group and packet delivery state information of the second cell group, determining whether to retransmit the transmitted packet based on the packet delivery state information of the first cell group and the packet delivery state information of the second cell group, and retransmitting the packet determined to be retransmitted to the user equipment via the first cell group.