Reflective DRB Mapping for 5G Handover Packet Loss
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Solution Overview
Problem
In new radio access networks, data packet loss or repeated transmission occurs during handover or dual connectivity scenarios due to each base station independently configuring different mapping relationships between flows and data radio bearers, affecting terminal service continuity and communication quality.
Innovation Solution
A data transmission method where a first access network device receives forwarded data packets from a second access network device, maps packets with and without flow identifiers to corresponding data radio bearers based on established mapping relationships, allowing flexible transmission manners to avoid packet loss and repetition, thereby improving terminal service continuity and communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If each access network device independently configures mapping relationship between flow and DRB, then device complexity is reduced and operation is simplified, but data packet loss and repeated transmission occur during handover affecting communication reliability
Solution Approach 1:
The patent applies preliminary action by pre-establishing a correspondence relationship between the first DRB (reflective DRB) and the DRB of the second access network device before handover occurs. This pre-configuration includes setting up mapping relationships between flow identifiers and DRBs in advance, so that when data packets are forwarded during handover, the target access network device can directly use the pre-established correspondence to correctly map packets to the appropriate DRB, avoiding packet loss and repeated transmission while maintaining independent configuration capabilities.
2Duration of action of stationary object
If data packets are forwarded between access network devices during handover, then service continuity is maintained, but packet loss and repeated transmission occur due to different mapping relationships
Solution Approach 1:
The patent introduces an intermediary mechanism by establishing a reflective DRB (first DRB) that acts as a bridge between the source and target access network devices. This first DRB maintains a correspondence relationship with the DRB of the second access network device, serving as an intermediary that preserves the mapping relationship information during handover. Data packets are forwarded through this intermediary structure, ensuring that the mapping relationship is preserved and packets are correctly routed without loss or repetition, thereby maintaining both service continuity and transmission accuracy.
3Adaptability or versatility
If different mapping relationships are configured by different base stations, then adaptability to local network conditions is improved, but communication continuity is affected during handover
Solution Approach 1:
The patent applies local quality by allowing the target access network device to maintain its own independent mapping relationship between flow identifiers and local DRBs while simultaneously establishing a correspondence with the source device's mapping relationship. The first DRB (reflective DRB) is configured with specific local characteristics that bridge the source and target mapping relationships. This enables each base station to adapt to local network conditions with its own mapping relationship while the correspondence mechanism ensures smooth transition during handover, maintaining communication continuity without sacrificing local adaptability.
Data Source
AI summary
This application provides a data transmission method. In the method, a first access network device and a second access network device establish a data radio bearer (DRB)-based tunnel and a session-based tunnel. The second access network device sends a Packet Data Convergence Protocol (PDCP) layer data packet to the first access network device via the DRB-based tunnel; and the second access network device sends a Service Data Adaptation Protocol (SDAP) layer data packet to the first access network device via the session-based tunnel.