Gateway Multicast Group for Wireless Handover Data Loss
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Solution Overview
Problem
In next-generation wireless communication systems, handovers between base stations result in data packet transmission delays and increased overhead due to bi-casting methods, which also lead to packet loss and resource inefficiency.
Innovation Solution
Implementing a method where the gateway sets up a multicast group for both the serving and target base stations, using the eGTP protocol and IGMP messages to efficiently transmit data traffic through the S1 interface, thereby minimizing data loss and reducing operational complexity during handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bi-casting transmission method is used to transmit data traffic from gateway to serving base station and target base station during handover, then data traffic can be transmitted to both base stations, but overhead is generated and packet transmission delay occurs
Solution Approach 1:
The patent applies preliminary action by establishing a multicast group before handover occurs. The serving base station creates a multicast group that includes both itself and the target base station, and notifies the gateway of this group establishment. This allows the gateway to subsequently transmit data traffic efficiently using multicast rather than bi-casting, reducing overhead while maintaining reliable data transmission during handover.
2Reliability
If bi-casting transmission method is used during handover, then data traffic can be transmitted to serving and target base stations, but packet transmission delay occurs due to lengthened forwarding path
Solution Approach 1:
The patent applies preliminary action by pre-establishing the multicast group with both serving and target base stations before handover. This allows the gateway to use efficient multicast transmission during handover, avoiding the lengthened forwarding path and packet reordering delays associated with bi-casting methods.
3Reliability
If bi-casting transmission method is used during handover, then data traffic can be transmitted to multiple base stations, but resource consumption increases
Solution Approach 1:
The patent applies preliminary action by establishing the multicast group structure in advance before handover. This pre-configuration enables the gateway to use resource-efficient multicast transmission during handover, avoiding the redundant resource consumption that would occur with bi-casting methods that transmit copies of data to multiple base stations simultaneously.
Data Source
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AI summary
The present invention relates to a method of transmitting data in a handover between base stations. When a mobile terminal performs a handover between base stations in a wireless communication system, a gateway transmits data traffic to be transmitted to a mobile terminal by using an IGMP (Internet Group Management Protocol) to a serving base station being serviced to the mobile terminal and a target base station to which a handover of the mobile terminal is made in a bi-casting method. Accordingly, when the mobile terminal performs the handover between the base stations, the gateway transmits the data traffic in the bi-casting method. As a result, it is possible to efficiently use a resource of a user plane connection interval between the gateway and the base station, thereby minimizing the loss of data traffic transmitted in a downlink, that is, data.