Handover Data Forwarding Path Identification in LTE
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Solution Overview
Problem
Existing mobile communication systems lack a specific method to identify the type of data forwarding during handover processing, leading to potential data transfer failures and inefficient use of communication resources.
Innovation Solution
A communication device and core network node configuration that allows for the transmission and reception of control information regarding the data transfer path, enabling the identification of Direct Forwarding or Indirect Forwarding paths, thereby ensuring appropriate data routing during handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data forwarding is executed during handover processing without identifying the forwarding type, then communication continuity can be maintained, but data transfer failures may occur and resource usage becomes inefficient
Solution Approach 1:
The patent introduces control information as an intermediary carrier that conveys data forwarding path information from the source base station to the target base station during handover processing. This control information acts as a mediator that ensures the target base station receives accurate instructions about whether to execute direct forwarding or indirect forwarding, thereby preventing data transfer failures without causing information loss.
2Reliability
If control information regarding data transfer path is transmitted during handover, then accurate data routing is achieved, but communication overhead increases
Solution Approach 1:
The patent integrates data forwarding path information into existing control information structures used in LTE handover processing, rather than creating separate dedicated messaging mechanisms. This allows the control information to serve multiple functions: coordinating handover execution and simultaneously conveying data forwarding instructions, thereby improving routing accuracy without proportionally increasing communication overhead.
3Speed
If direct forwarding is used for data transfer during handover, then transfer speed is improved, but device complexity increases due to X2 link requirements
Solution Approach 1:
The patent implements a dynamic data forwarding mechanism where the forwarding method (direct or indirect) is determined based on real-time network conditions and device capabilities. The control information conveys flexible instructions that allow the target base station to adapt the forwarding approach according to current X2 link availability and network state, thereby achieving high transfer speed when conditions permit while avoiding unnecessary complexity when direct forwarding is not feasible.
Data Source
AI summary
In the case where a wireless terminal conducts a handover from a first device to a second device, a communication device of this exemplary embodiment performs communication with the second device and a core network node, in order to notify an appropriate device of information regarding the transfer path of data. The communication device receives control information from the core network node upon the handover. The control information is information regarding the transfer path of data to be transferred from the first device to the second device.