Network Device Handover Packet Management via Feedback
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In LTE RANs, during handovers, user equipment (UE) may not receive acknowledgement signals for transmitted packets, leading to unnecessary retransmissions due to deteriorated radio communication, which can result in packet loss and inefficiencies.
Innovation Solution
A network device with a transceiver and control module that transmits packets to a first access point and requests a handover to a second access point, receiving a control message indicating which packets were successfully received by the first access point, and subsequently refrains from retransmitting those packets to the second access point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE retransmits packets during handover to ensure delivery, then packet loss is reduced, but redundant transmissions increase resource usage and network inefficiency
Solution Approach 1:
The target base station provides feedback information to the UE about which packets were successfully received from the source base station during handover. This feedback mechanism enables the UE to identify and avoid retransmitting packets that have already been successfully received, thereby eliminating redundant transmissions while ensuring reliable packet delivery.
Solution Approach 2:
The target base station performs preliminary reception of packets from the source base station before the handover is complete. By having the target base station receive and buffer packets in advance, the system can determine which packets were successfully transmitted before the UE needs to retransmit, preventing unnecessary retransmissions.
2Reliability
If the UE waits for ACK signals before discarding packets, then packet loss is minimized, but transmission efficiency decreases due to timeout delays
Solution Approach 1:
The system implements a feedback mechanism where the target base station informs the UE about successfully received packets during handover. This feedback allows the UE to immediately discard packets that have been confirmed as received, rather than waiting for timeout periods, thus improving transmission efficiency while maintaining reliability.
3Reliability
If the UE transmits all packets during handover to ensure delivery, then packet loss is reduced, but network resource usage increases due to redundant transmissions
Solution Approach 1:
The target base station provides feedback information to the UE identifying which packets were successfully received from the source base station. This feedback enables the UE to selectively retransmit only the necessary packets, reducing the total number of transmissions while ensuring all required packets are delivered.
Solution Approach 2:
The UE discards packets that have been confirmed as successfully received during handover, avoiding redundant transmissions. The system recovers from potential packet loss by selectively retransmitting only those packets that were not successfully received, optimizing the balance between reliability and transmission quantity.
4Productivity
If the handover process includes packet status verification, then redundant transmissions are reduced, but the complexity of the handover protocol increases
Solution Approach 1:
The handover protocol incorporates a feedback mechanism where the target base station communicates packet reception status to the UE. This feedback is integrated into the existing handover signaling, allowing packet status verification without requiring a completely new protocol framework, thus balancing complexity and efficiency.
Data Source
AI summary
A network device includes a transceiver and a control module. The transceiver transmits, from the network device to a first access point, first packets and second packets, transmits a request signal to a second access point to perform a handover of support for the network device from the first access point to the second access point, and receives a control message from the second access point based on the request signal. The transceiver receives the control message subsequent to transmitting the first packets to the second access point. The control message indicates the second access point received, during the handover, the first packets from the first access point, and one of the first packets from the network device. The control module, based on the control message, refrains from transmitting the one of the first packets, discards the first packets, and has the second packets transmitted to the second access point.