Partial SDAP Flow Configuration for Master-Slave Data Forwarding
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Solution Overview
Problem
Current specifications do not support direct data forwarding from a master base station to a slave base station during handover in scenarios where the Service Data Adaptation Protocol (SDAP) layer is partially configured on each node in a PDU session, leading to poor user experience due to incomplete data forwarding.
Innovation Solution
A method where a master base station configures the SDAP layer for part of the flows on itself and the remaining part on a newly added slave base station, sending handover request response messages with specific tunnel addresses for each node to facilitate direct data forwarding during the handover process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the SDAP layer is partially configured on the master base station and partially on the slave base station for different flows in a PDU session, then data forwarding capability is improved, but the current specification does not support this scenario
Solution Approach 1:
The patent segments the PDU session data flows into two parts: one part is forwarded to the master base station and another part is forwarded to the slave base station. This is achieved by configuring the SDAP layer partially on the master base station and partially on the slave base station, allowing differentiated data forwarding paths for different flows within the same PDU session.
Solution Approach 2:
The patent introduces a new dimension to the data forwarding architecture by enabling dual data forwarding destinations (master base station and slave base station) from a single source base station. This extends the traditional single-path forwarding model to a multi-path model, allowing simultaneous configuration of SDAP layers on both master and slave base stations.
2Device complexity
If direct data forwarding to the slave base station is not supported, then system complexity is reduced, but user experience deteriorates due to incomplete data forwarding
Solution Approach 1:
The master base station acts as an intermediary in the data forwarding process. The source base station forwards data to both the master base station and the slave base station directly, eliminating the need for the master base station to relay all data through the slave base station. This intermediary role allows the system to support direct data forwarding to the slave base station while maintaining manageable system complexity.
3Ease of operation
If only a single data forwarding address is provided in the handover response message, then message simplicity is maintained, but the ability to support partial flow configuration on slave base station is lost
Solution Approach 1:
The handover response message is segmented to include multiple data forwarding addresses: one address for forwarding data to the master base station and another address for forwarding data to the slave base station. This segmentation allows the message to convey differentiated forwarding information for different flows while maintaining a structured and manageable format.
Solution Approach 2:
The handover response message is enhanced to serve multiple functions: it provides data forwarding addresses for both the master base station and the slave base station, supports configuration of SDAP layers on both nodes, and enables flexible flow distribution. This multi-functional message structure maintains ease of operation while significantly improving adaptability.
Data Source
AI summary
A data forwarding method and device, a master base station and a slave base station are provided. The data forwarding method includes: after receiving a handover request message sent by a second master base station, if it is determined that a slave base station node is newly added, a service data adaptation protocol (SDAP) layer of a part of flows of a preset protocol data unit (PDU) session is configured at a master base station node, and an SDAP layer of the rest part of flows of the preset PDU is configured at the newly added slave base station node, sending a handover request response message carrying first preset information to a second master base station. The first preset information includes: first identity identifications of all flows configured for the first master base station and data forwarding addresses corresponding to the first identity identifications, and second identity identifications of all flows configured for the newly added first slave base station and data forwarding addresses corresponding to the second identity identifications.