Data Forwarding in Hierarchical Network Handover
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In the existing layered network, the frequent handover of User Equipment (UE) between macro and local cells leads to a higher risk of interrupted communication due to increased handover frequency and times, resulting in potential data loss during the handover process.
Innovation Solution
The method involves separating the user plane from the control plane, where the source macro base station obtains and transmits sequence number transmission status information of uplink and downlink PDCP data packets to the target base station, allowing the target base station to set up a user plane connection with the UE, thereby minimizing data loss during handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE is frequently handed over between macro and local cells to provide high quality service, then service quality is improved, but communication reliability deteriorates due to increased handover frequency and data loss risk
Solution Approach 1:
The source base station performs preliminary actions by obtaining sequence number transmission status information before handover occurs, and proactively forwards this information to the target base station. This preliminary data preparation ensures that the target base station already has the necessary information to maintain seamless data transmission, preventing communication interruptions during the actual handover execution.
Solution Approach 2:
The source base station acts as an intermediary by collecting sequence number transmission status information from the local base station and relaying it to the target base station. This intermediary role ensures accurate information transfer between network elements, enabling the target base station to properly configure data forwarding and maintain communication reliability during handover.
2Reliability
If complete sequence number transmission status information is forwarded during handover to prevent data loss, then communication reliability is improved, but device complexity increases due to additional information handling
Solution Approach 1:
The invention extracts only the essential sequence number transmission status information needed for reliable data forwarding, rather than transferring all possible data. By selectively extracting and forwarding only the critical sequence number status, the system achieves improved communication reliability while minimizing the additional complexity introduced by information handling.
Data Source
AI summary
Disclosed are a data forwarding method and device, used for solving the problem that a communication interruption risk is generated when a user equipment (UE) is handed over in an existing hierarchical network. The method comprises: a source macro base station obtaining serial number sending state information of PDCP data packets, in uplink and downlink directions, of a local base station currently accessed by a UE, a control plane of the UE being connected to the source macro base station, and a user plane being connected to the local base station; and the source macro base station sending the serial number sending state information to a target base station that the UE is to be handed over to, and the target base station establishing a user plane connection to the UE according to the serial number sending state information.