Multi-Interface Packet Aggregation Using Path Mapping in V2X
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Solution Overview
Problem
In wireless communications systems, particularly in V2X communication, the receive end is unable to determine the paths through which data packets need to be aggregated, leading to inefficiencies in data packet reordering and deduplication.
Innovation Solution
A communication method and apparatus that enable the receive end to learn the mapping relationship between different paths, allowing data packets received through multiple interfaces to be aggregated correctly by determining the mapping relationship using identification information or configuration, thereby facilitating data aggregation, reordering, and duplicate packet detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data packets are transmitted through multiple interfaces to improve transmission performance, then data transmission reliability is improved, but the receive end cannot determine which paths need aggregation leading to data packet disorganization
Solution Approach 1:
The patent introduces an adaptation layer as an intermediary between the PDCP layer and RLC layer. This adaptation layer adds path identification information to data packets, enabling the receive end to identify and aggregate packets from different paths correctly. The intermediary layer resolves the information loss problem by embedding path mapping information without altering the core data transmission function.
Solution Approach 2:
The patent adds a new dimensional layer (adaptation layer) to the existing protocol stack. This new layer operates between the PDCP and RLC layers, providing path identification capabilities that were previously absent. By adding this dimensional layer, the system can track and aggregate packets from multiple interfaces without disrupting the existing transmission reliability mechanism.
2Productivity
If data packets are duplicated or split between terminal devices to improve transmission performance, then data transmission speed is improved, but the receive end cannot learn the mapping relationship between interfaces leading to aggregation failures
Solution Approach 1:
The patent segments the protocol stack by introducing an adaptation layer that handles path identification and mapping functions separately from the existing PDCP and RLC layers. This segmentation allows each layer to focus on its specific function: the adaptation layer manages path information, while PDCP handles data integrity and RLC handles radio link control. This modular approach manages complexity by distributing functions across layers.
Solution Approach 2:
The adaptation layer serves multiple functions: it adds path identification information to packets, enables the receive end to determine aggregation paths, and maintains compatibility with existing PDCP and RLC layer functions. This multi-functional layer improves transmission speed through efficient path management while keeping overall system complexity manageable through functional integration.
3Reliability
If the receive end aggregates data packets from multiple interfaces, then data packet completeness is improved, but without path identification information, aggregation accuracy deteriorates
Solution Approach 1:
The patent uses path identification information as a form of 'color coding' for data packets. Each path is identified by specific information added by the adaptation layer, allowing the receive end to distinguish packets from different paths. This identification mechanism enables accurate aggregation by matching packets with their correct destination paths, significantly improving aggregation accuracy.
Solution Approach 2:
The adaptation layer provides feedback information in the form of path identification data embedded in each packet. This feedback enables the receive end to verify correct path routing and make accurate aggregation decisions. The path identification information acts as a feedback mechanism that continuously guides the aggregation process, ensuring high accuracy in packet reassembly.
Data Source
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AI summary
This application provides a communication method and a communications apparatus, so that a receive end can learn of interfaces, where data packets received through paths of the interfaces need to be aggregated. The method includes: receiving, by a first terminal device through a first path, a first data packet sent by a second terminal device, where the first path is borne on a first wireless interface, and the first wireless interface is a wireless communications interface for direct communication between the second terminal device and the first terminal device; receiving, by the first terminal device through a second path, a second data packet sent by the second terminal device, where the second path is borne on a second wireless interface, the second wireless interface is a communications interface for communication between a wireless network device and the first terminal device, or the second wireless interface is another wireless communications interface for direct communication between the second terminal device and the first terminal device, and the first path has a mapping relationship with the second path; and transmitting, by the first terminal device based on the mapping relationship, the first data packet and the second data packet to a same aggregation protocol layer entity to perform data aggregation processing.