In-Order Data Transmission During Bearer Transfer in 5G Dual Connectivity
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Solution Overview
Problem
In 5G network deployment, particularly in Dual Connectivity (DC) scenarios, there is a challenge of ensuring in-order data transmission when bearers are transferred between LTE and NR nodes, leading to out-of-order delivery issues due to the lack of effective protocols for managing data flow across different radio bearers.
Innovation Solution
The method involves sending first indication information from a first network device to a second network device to initiate in-order transmission on a new bearer, ensuring that partial data not acknowledged are transmitted completely before proceeding with further data transfer, using protocols like SDAP to manage QoS data flows and maintain Data Radio Bearers (DRBs) across nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If bearer transfer is implemented between LTE and NR nodes in Dual Connectivity, then network flexibility and deployment options are improved, but data transmission order is compromised leading to out-of-order delivery
Solution Approach 1:
The patent applies preliminary action by having the source network device send indication information to the target network device before the bearer transfer is completed. This indication information triggers the target device to start in-order transmission in advance, ensuring that data packets are transmitted in the correct sequence from the beginning of the transfer process, thereby preventing out-of-order delivery while maintaining network flexibility
2Reliability
If SDAP protocol is introduced in 5G NR for QoS flow mapping, then quality of service management is improved, but protocol complexity increases causing out-of-order delivery issues during bearer changes
Solution Approach 1:
The patent uses indication information as an intermediary mechanism between the source and target network devices. This intermediary signal coordinates the SDAP protocol operations during bearer transfer, ensuring that QoS flow mapping is maintained correctly while simplifying the coordination process and preventing out-of-order delivery without significantly increasing protocol complexity
Data Source
AI summary
Disclosed are a method for submitting data in sequence, a network device, a terminal device and a computer storage medium. The method comprises: when a bearer of data streams is transferred from a first network device to a second network device, the first network device sends first instruction information to the second network device, wherein the first instruction information is used for instructing the second network to transmit the transferred data streams on a new bearer in sequence.