Wireless Base Station Handover Data Retention
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Solution Overview
Problem
In third generation mobile communication systems, handover procedures between integrated wireless base stations often result in data loss due to lack of delivery confirmation, leading to retransmission of large data volumes and increased network load, especially during high-speed movements and non-real-time services.
Innovation Solution
Implementing an Automatic Repeat Request (ARQ) function that shares error information between integrated wireless base stations, allowing data to be held until confirmation of arrival at the mobile terminal equipment, and using a dual ARQ system to manage data transfer without loss during handover failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If user data is transferred from one integrated wireless base station to another during hand over, then data loss is prevented, but delivery confirmation is not made and data is lost if hand over fails due to radio error
Solution Approach 1:
The patent implements a feedback mechanism where the target integrated wireless base station sends delivery confirmation information back to the source base station. When user data is transferred during handover, the target base station confirms whether the data was successfully received and delivered to the mobile terminal. This feedback loop enables the source base station to identify and retransmit any data that was not successfully transferred, thereby preventing data loss while maintaining reliable handover procedures.
Solution Approach 2:
The patent applies preliminary action by having the source integrated wireless base station hold onto user data until delivery confirmation is received from the target base station. Instead of immediately discarding data after transfer initiation, the system retains the data in a buffer during the handover process. This preliminary retention action ensures that if the handover fails or data delivery is not confirmed, the source base station can retransmit the data without loss.
2Reliability
If data is buffered at the wireless base station during hand over, then data loss is prevented, but network load increases due to retransmission requirements
Solution Approach 1:
The feedback mechanism allows the system to quickly identify successful versus failed data transfers during handover. By receiving delivery confirmation information from the target base station, the source base station can immediately determine which data packets were successfully transferred and which require retransmission. This selective approach minimizes unnecessary retransmissions and optimizes network resource utilization while maintaining data reliability.
Solution Approach 2:
The patent implements a selective data retention and discarding strategy. Data that receives successful delivery confirmation during handover is discarded from the source base station's buffer, freeing up memory and reducing the need for future retransmissions. Only data that fails delivery confirmation is retained for potential retransmission. This approach balances data reliability with network efficiency by minimizing the burden on network resources while ensuring data integrity.
3Loss of information
If delivery confirmation is implemented between integrated wireless base stations, then data loss is prevented, but system complexity increases
Solution Approach 1:
The delivery confirmation mechanism is integrated into the existing handover procedure framework, allowing the same communication channels and protocols to serve multiple functions. The confirmation messages are embedded within the standard handover signaling structure, eliminating the need for separate dedicated confirmation channels. This multi-functional approach prevents data loss while avoiding significant increases in system complexity.
Solution Approach 2:
The target integrated wireless base station automatically generates and sends delivery confirmation information to the source base station as part of its normal data reception and forwarding process. This self-service mechanism eliminates the need for the source base station to actively query or track each data packet's delivery status. The confirmation process is handled autonomously by the target base station, simplifying the overall system architecture while ensuring data integrity.
Data Source
AI summary
The invention provides a mobile communication system capable of transferring data to be sent to mobile terminal equipment from one wireless base station to another during hand over, the wireless base station of a transfer source of the data including an accumulation portion that holds the data until the data normally arrives at the mobile terminal equipment.