Evolved NodeB Packet Caching for LTE Handover
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Solution Overview
Problem
In LTE-Advanced networks, the introduction of relay nodes leads to inefficient data forwarding during handovers, causing repeated transmission of downlink data between relay nodes and evolved NodeBs, resulting in wastage of radio links and network resources.
Innovation Solution
Implement a method where evolved NodeBs cache data packets until confirmation of correct receipt by user equipment, and upon receipt confirmation, send a response to stop further caching, allowing direct data transfer during handovers, thereby avoiding redundant forwarding and conserving network resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the relay node forwards downlink data cached but not yet sent to the user equipment to the donor evolved NodeB during handover, then the user equipment can receive the data after handover, but the same data is sent by the donor evolved NodeB to the relay node and then forwarded back to the donor evolved NodeB, causing waste of radio link resources
Solution Approach 1:
The evolved NodeB caches data packets before handover occurs, preparing them in advance for potential direct delivery to the user equipment after handover. This preliminary caching action prevents the need for redundant data forwarding during handover, as the data is already available at the evolved NodeB and can be directly transmitted to the new access point or user equipment without returning through the relay node.
2Loss of energy
If the evolved NodeB caches data packets until confirmation of correct receipt by user equipment, then redundant forwarding is avoided, but network resources are occupied longer
Solution Approach 1:
The system implements a feedback mechanism where the access point or user equipment sends acknowledgment information to the evolved NodeB confirming successful data receipt. Based on this feedback, the evolved NodeB determines when to release cached data packets from the buffer. This feedback-driven approach ensures that data is retained in the buffer only as long as necessary, optimizing the balance between avoiding redundant transmissions and managing buffer resource usage.
Data Source
AI summary
The present invention relates to radio communications technologies and discloses a method, an apparatus, and a system for sending a data packet to avoid repeated forwarding of data when a user equipment hands over between an access point and an evolved NodeB. The method includes: receiving, by an evolved NodeB, a data packet sent by a core network and sending the data packet to a current access point; and keeping caching the data packet on the evolved NodeB before determining that a user equipment has correctly received the data packet from the current access point. The present invention is applicable to data transmission in a network.