RAN Node Priority Extraction for MTC Congestion Control
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Solution Overview
Problem
Existing mobile communication networks are not optimized for machine-to-machine (M2M) communication, leading to network congestion issues due to the inability to quickly determine the priority of NAS request messages during congestion, which affects effective congestion control.
Innovation Solution
The radio access network node converts the request reason in the AS message into priority indication information and includes it in the signaling sent to the core network, allowing the core network to determine priority without reading the NAS request message, enabling quicker congestion control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the core network reads the NAS request message to determine priority, then accurate priority identification is achieved, but congestion control speed deteriorates
Solution Approach 1:
The solution segments the priority information from the NAS request message by extracting it from the AS message header (request reason) and transmitting it separately as priority indication information in the RRC connection setup request. This allows the core network to receive priority information independently without needing to read and parse the entire NAS message, thus resolving the contradiction between accurate priority identification and fast congestion control response.
Solution Approach 2:
The radio access network node performs preliminary extraction and forwarding of priority indication information before the core network receives the NAS request message. By pre-processing the AS message and sending priority information ahead of time in the RRC connection setup request, the core network can make congestion control decisions based on already-available priority data, eliminating the time delay associated with reading the NAS message.
2Reliability
If the radio access network forwards the complete NAS request message, then message integrity is maintained, but core network processing complexity increases
Solution Approach 1:
The solution extracts the priority indication information from the AS message header and separates it from the NAS request message. The radio access network node forwards both the extracted priority information and the original NAS message to the core network. This extraction approach maintains the integrity of the NAS message while reducing core network processing complexity, as the core network can quickly determine priority from the separately provided indication information without needing to parse the entire NAS message structure.
3Measurement precision
If the core network reads NAS messages to determine priority, then accurate priority determination is achieved, but congestion control efficiency deteriorates
Solution Approach 1:
By segmenting priority information from the NAS message and transmitting it separately as priority indication information, the core network can determine priority instantly without reading the NAS message. This segmentation maintains accurate priority determination while dramatically improving congestion control efficiency, as the core network processes priority information in parallel with or before NAS message handling.
Solution Approach 2:
The radio access network performs preliminary extraction and forwarding of priority indication information before the NAS message reaches the core network. This preliminary action enables the core network to have priority information ready in advance, improving congestion control efficiency by eliminating the need to read and parse NAS messages during congestion scenarios.
Data Source
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AI summary
Disclosed are an NAS connection establishment method and a radio access network node, the method includes: a radio access network node receiving, from a machine type communication (MTC) user equipment (UE), an Access Stratum (AS) message carrying a non-access stratum (NAS) request message, wherein the AS message carries a request reason of the AS request message; the radio access network node converting the request reason in the AS message into priority indication information and sending a signaling to a core network node, wherein the signaling includes priority indication information and the NAS request message carried in the AS message; the core network node determining the priority of the NAS request message based on the priority indication information in the signaling, and when the core network has a congestion, the core network node sending a rejection response message to a UE that sends an NAS request message with a low priority. The present invention is able to rapidly respond to a network congestion.