RLC Header Indication Field for Reliable IoV Data Replication
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Solution Overview
Problem
The Internet of Vehicles (IoV) system faces challenges in ensuring reliable data transmission due to its high requirements, particularly in Device-to-Device (D2D) communication scenarios where conventional methods struggle to maintain transmission reliability and efficiency.
Innovation Solution
The method involves including an indication field in the RLC header of RLC PDUs to specify the corresponding radio bearer, allowing the receiving device to determine the correct radio bearer for each PDU, thereby ensuring reliable transmission of duplicated data in IoV systems, particularly through carrier aggregation and D2D communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data duplication is implemented in D2D communication for reliable transmission, then transmission reliability is improved, but device complexity increases due to multiple RLC PDUs and radio bearer management
Solution Approach 1:
The patent segments the indication information by separating it into two parts: the first indication information (radio bearer identity) is placed in the RLC header of each RLC PDU, while the second indication information (logical channel identity) is placed in the MAC sub-header. This segmentation allows the receiving device to process different indication information from appropriate layers, reducing overall device complexity while maintaining transmission reliability through duplicated data transmission.
Solution Approach 2:
The patent introduces an intermediary mechanism where the RLC layer acts as a mediator between the PDCP layer (which performs duplication) and the MAC layer. The RLC header with the first indication information serves as an intermediary structure that carries radio bearer identification, enabling the receiving device to correctly associate duplicated RLC PDUs with their corresponding radio bearers without requiring complex cross-layer processing.
2Reliability
If indication fields are added to RLC headers to identify radio bearers, then transmission reliability is improved through accurate bearer identification, but overhead increases
Solution Approach 1:
The patent makes the first indication information field in the RLC header configurable and multi-functional. This field can indicate different types of information depending on the scenario: radio bearer identity for duplicated data transmission, or other identification information for non-duplicated transmission. This universality allows the same field structure to serve multiple purposes, reducing the need for additional dedicated fields and thereby minimizing overhead while maintaining reliability.
3Reliability
If multiple logical channels are used for data duplication, then transmission reliability is improved, but difficulty of detecting and measuring increases
Solution Approach 1:
The patent applies preliminary action by pre-configuring the association relationships between logical channels and radio bearers before data transmission begins. The transmitting device establishes these mappings in advance, and the receiving device is pre-equipped with the corresponding indication information in both the RLC header (first indication information) and MAC sub-header (second indication information). This preliminary preparation eliminates the need for complex real-time detection and measurement during transmission, as the identification information is already available and correctly positioned.
Data Source
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AI summary
Provided in embodiments of the present application are a method of supporting data replication, transmitting terminal device and receiving terminal device capable of realizing reliable transmission of replicated data in a vehicle-to-everything system. The method comprises: a transmitting terminal device transmitting a plurality of radio link control protocol data units (RLC PDUs) to a receiving terminal device, an RLC header of at least one RLC PDU in the plurality of RLC PDUs comprising an indication field for indicating a radio bearer corresponding to a current RLC PDU.