NAS Access Stratum Reliability Control for V2X Data Transmission
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Solution Overview
Problem
In Vehicle-to-Everything (V2X) systems, determining whether to perform reliable data transmission based on the transmission mode and architecture is a challenge, especially in LTE D2D communication, where conventional methods lack clear indicators for ensuring data reliability.
Innovation Solution
The method involves the Network Attachment Sublayer (NAS) of a terminal device acquiring description information about the data to be transmitted, determining reliable transmission indication information based on preset mapping relationships, and instructing the access stratum to request network devices for reliable transmission, using Carrier Aggregation (CA) technology and PDCP duplication for enhanced reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data duplication transmission is performed through PDCP and RLC entities on different physical-layer aggregated carriers, then data transmission reliability is improved, but device complexity and transmission protocol overhead increase
Solution Approach 1:
The patent segments the data transmission process by separating the reliability determination function into the NAS layer and the execution function into the access stratum. The NAS layer determines whether reliable transmission is needed based on service requirements, while the access stratum executes the actual transmission. This segmentation allows selective application of complex duplication mechanisms only when necessary, reducing overall device complexity while maintaining reliability where needed.
Solution Approach 2:
The patent implements dynamic control of transmission reliability by allowing the NAS layer to dynamically determine and instruct the access stratum on whether to perform reliable transmission based on real-time service requirements, data types, and network conditions. This dynamic approach enables the system to adapt between simple and complex transmission modes, optimizing the balance between reliability and device complexity.
2Reliability
If reliable transmission is performed for all data in V2X systems, then data transmission reliability is improved, but transmission delay and spectrum efficiency deteriorate
Solution Approach 1:
The patent applies local quality by determining reliability requirements locally for each data packet or service type rather than uniformly for all transmissions. The NAS layer evaluates specific service requirements, data types, and transmission conditions to selectively apply reliable transmission only where necessary, avoiding the delay overhead of universal reliable transmission while maintaining reliability for critical data.
Solution Approach 2:
The patent changes the parameter of transmission reliability dynamically based on service requirements and network conditions. By allowing the NAS layer to adjust the reliability parameter (whether to perform reliable transmission) based on varying conditions, the system can switch between fast unreliable transmission and slower reliable transmission, optimizing the trade-off between delay and reliability for different scenarios.
3Productivity
If the terminal determines transmission resource in mode 4 combining sensing and reservation, then spectrum efficiency is improved, but transmission reliability deteriorates due to lack of network coordination
Solution Approach 1:
The patent introduces the NAS layer as an intermediary between the terminal and the network for reliable transmission requests. When operating in mode 4 with autonomous resource selection, the terminal can still invoke the NAS layer to determine whether reliable transmission is needed and to coordinate with the network device accordingly, bridging the gap between autonomous resource selection and network-coordinated reliability.
4Reliability
If data duplication is transmitted through multiple RLC entities and physical carriers, then frequency diversity gain is achieved, but transmission protocol overhead and processing complexity increase
Solution Approach 1:
The patent performs preliminary action by having the NAS layer determine in advance whether reliable transmission is required before the actual data transmission occurs. This advance determination allows the system to prepare duplication mechanisms only when needed, avoiding the processing complexity of always-active duplication while ensuring frequency diversity gain is available when reliability is required.
Data Source
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AI summary
Embodiments of the present invention provide a data transmission method and device, and a computer storage medium. The method comprises: a non-access stratum of a terminal device obtains description information of data to be transmitted; the non-access stratum determines, according to a mapping relationship between preset data description information and reliability transmission indication information, and the description information of the data to be transmitted, the reliability transmission indication information corresponding to the data to be transmitted, wherein the reliability transmission indication information is used for indicating whether to perform reliability transmission on the data to be transmitted; in response to the feature that the reliability transmission indication information indicates to perform reliability transmission on the data to be transmitted, after the non-access stratum transmits the reliability transmission indication information corresponding to the data to be transmitted to an access stratum of the terminal device, the access stratum sends a reliability transmission request message to a network device, wherein the reliability transmission request message is used for transmitting the data to be transmitted between the terminal device and the network device by means of a set reliability transmission policy.