Wireless Path Switching With Pending Packet Forwarding
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Solution Overview
Problem
In wireless communication networks, particularly in vehicle-to-everything (V2X) scenarios, efficient path switching for remote UEs experiencing mobility and varying communication environments is necessary to prevent packet loss during transitions between direct and indirect communication paths.
Innovation Solution
A method and apparatus for path switching in wireless communication networks that involves forwarding pending packets from an old path to a new path during a switch, utilizing UE-to-NW and UE-to-UE relays to maintain connectivity and minimize packet loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If path switching is performed between direct path and indirect path for mobile UE, then communication continuity is improved, but packet loss occurs during the switching process
Solution Approach 1:
The source base station forwards pending packets to the target base station before the UE completes path switching. This preliminary action ensures that packets already in transit are not lost when the transmission path changes, directly resolving the packet loss issue while maintaining communication continuity
Solution Approach 2:
The source base station acts as an intermediary by receiving pending packets from the UE and forwarding them to the target base station. This intermediary mechanism bridges the old and new paths, ensuring seamless packet delivery during the transition and eliminating packet loss
2Adaptability or versatility
If relay UEs are used to support remote UE connectivity, then network coverage is extended, but path switching complexity increases
Solution Approach 1:
The network controller acts as a central intermediary that manages path switching decisions for remote UEs. By centralizing the control logic, the system simplifies the switching process despite the complexity of multiple relay paths, as the network controller coordinates all switching operations without requiring complex local decisions at each relay UE
Solution Approach 2:
The path switching mechanism is designed to be universal, working for both direct connections and relay-assisted connections through the same forwarding principle. The source base station (or serving relay) forwards pending packets to the target base station (or new serving relay) regardless of the path type, simplifying the overall switching complexity while maintaining extended coverage capabilities
Data Source
AI summary
Various embodiments of the present disclosure provide a method for path switch. The method which may be performed by a terminal device comprises performing transmission with a first node on a first path. In accordance with an exemplary embodiment, the method further comprises switching from the first path to a second path to perform transmission with a second node on the second path. During the switching of the terminal device, one or more pending packets of the terminal device on the first path may be forwarded to the second path. In accordance with an exemplary embodiment, the first node and the second node may be served by a base station. In accordance with another exemplary embodiment, the first node and the second node may be served by different base stations.