Mobile Handover Data Loss via Sequence Number Transfer
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Solution Overview
Problem
In mobile communication systems, data loss occurs when a radio UE moves away to a new base station, and existing methods are inefficient in handling this issue due to reliance on the base station controller for data handling, leading to slowed data processing.
Innovation Solution
The method involves the radio UE transferring a sequence number for specific data to the new base station during handover, allowing for efficient data handling by including this information in a request message and suspending or initiating data transmission accordingly, with the new base station transmitting data units corresponding to the sequence number.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station controller handles data loss during handover, then data loss can be managed, but data processing speed decreases
Solution Approach 1:
The patent extracts the data handling function from the base station controller and implements it directly at the base station level. The new base station receives the sequence number from the UE and independently retrieves and transmits the corresponding data units without requiring base station controller intervention, thereby resolving the contradiction between reliable data loss management and fast data processing
Solution Approach 2:
The sequence number acts as an intermediary information element that enables direct communication between the UE and the new base station for data retrieval operations. By including the sequence number in the request message, the UE can directly indicate which data units need to be transmitted, eliminating the need for base station controller mediation and improving processing speed while maintaining reliability
2Productivity
If sequence number transfer is implemented during handover, then data transfer efficiency improves, but signaling complexity increases
Solution Approach 1:
The patent merges the sequence number transfer with the existing handover request message. Instead of creating a separate signaling procedure, the sequence number is included as an additional information element in the handover request message that the UE already sends during handover, thereby improving data transfer efficiency without significantly increasing signaling complexity
Solution Approach 2:
The handover request message is enhanced to serve multiple functions: it still performs the original handover signaling function while also carrying the sequence number information needed for efficient data retrieval. This multi-functionality approach allows the same message structure to handle both control signaling and data transfer coordination, minimizing additional complexity
Data Source
AI summary
A method of communicating signals in a mobile communication system having a first base station, a second base station, and a base station controlling node controlling the first base station and the second base station is presented. The method includes during a handover, receiving, at the first base station, a control message from the second base station including a sequence number indicating at least one data unit to be transmitted to a mobile station or to be received from a mobile station, wherein the first base station receives the control message from the second base station without being controlled by the base station controlling node.