HeNB Handover Path Management for LTE-A
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Solution Overview
Problem
Current mobile wireless systems experience significant data reception interruptions during handover between networks with different handover anchor points, as existing methods do not efficiently manage the change in IP addresses and communication paths, leading to delays and disruptions in real-time communication.
Innovation Solution
A mobile wireless system that includes first and second gateway nodes acting as different handover anchor points, with a first access point capable of establishing communication paths with both gateway nodes simultaneously, allowing for seamless handover by maintaining communication along existing paths and transferring data through new paths established with the second gateway node, thereby minimizing interruption time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the mobile terminal performs handover between networks with different handover anchor points (PGW change), then the IP address changes and a new bearer is established, but the session with the communication destination is disconnected causing data reception interruption
Solution Approach 1:
The access point device establishes a second communication path with the second gateway node before disconnecting from the mobile terminal during handover. This preliminary establishment of the new path ensures that when the mobile terminal switches networks, the session can be quickly reestablished without interruption, as the new communication path is already ready to receive and forward data.
Solution Approach 2:
The first access point device acts as an intermediary by receiving data from the communication destination along the first communication path and forwarding it along the second communication path to the second gateway node. This intermediary data transmission maintains session continuity during the handover transition, preventing disconnection despite the change in gateway anchor points.
2Reliability
If the access point device establishes communication paths with both gateway nodes simultaneously, then seamless handover is enabled, but the device complexity increases
Solution Approach 1:
The access point device dynamically manages communication paths by maintaining the first communication path with the first gateway node while simultaneously establishing a second communication path with the second gateway node. This dynamic path management allows seamless handover by having both paths available, switching between them based on the mobile terminal's connection state without requiring complete reconfiguration.
3Reliability
If the first access point device transmits data along the second communication path during handover, then data reception interruption time is reduced, but the loss of time for path establishment and data forwarding increases
Solution Approach 1:
The first access point device maintains continuous data transmission by receiving data from the communication destination along the first communication path and simultaneously forwarding it along the second communication path. This continuous action ensures that data flow never stops during handover, as the first path remains active for receiving while the second path is prepared for forwarding, eliminating idle time.
Data Source
AI summary
A mobile wireless system includes a first gateway (L-PGW), a second gateway (PGW), a first access point (HeNB) capable of establishing a communication path simultaneously with the first and second gateways, and a second access point (eNB) capable of establishing a communication path only with the PGW. When a mobile terminal connected to the HeNB and communicating with a communication destination node using a first path through the L-PGW switches a connection destination to the eNB, the HeNB establishes a second path through the HeNB and the PGW, while maintaining the first path. The HeNB transmits data, which has been transmitted to the HeNB along the first path, to the eNB along the second path, until the UE is connected to the eNB, and a third path to the communication destination node through the PGW is established. Accordingly, an interruption time of data reception involved in handover is shortened.