Session Control Node Prioritized Call Bearer Establishment
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Solution Overview
Problem
In mobile communication systems, prioritized calls are not effectively processed over normal calls when the mobility management node or radio base station is congested, leading to prioritized calls being discarded due to inability to distinguish between prioritized and normal call signals.
Innovation Solution
Implementing a method where a session control node establishes a prioritized-call bearer and transmits signals with priority identifiers through the gateway device and mobility management node to the radio base station, allowing prioritized calls to be preferentially processed by including priority identifiers in signaling messages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobility management node MME or radio base station eNodeB processes all calls equally without priority identification, then the system operation is simple, but prioritized calls cannot be preferentially processed during congestion
Solution Approach 1:
The patent applies the concept of visual identification by introducing priority identifiers that act like 'color codes' in signaling messages. The Invite signal includes prioritized-call information that visually (digitally) marks the call as high priority, allowing network elements to quickly identify and prioritize processing without complex analysis of call content.
Solution Approach 2:
The session control node S/P-CSCF acts as an intermediary that introduces priority identifiers into the signaling path. This mediator adds the prioritized-call information to the Invite signal before it reaches the gateway device and subsequent network elements, enabling priority processing without modifying the core calling functionality.
2Reliability
If the mobility management node MME transmits Paging signals without priority identification, then the transmission process is simple, but Paging signals for prioritized calls are discarded during congestion
Solution Approach 1:
The priority identifier is embedded in the Paging signal in advance, before the signal reaches congested network elements. The session control node and gateway device prepare the prioritized-call information beforehand, so that when congestion occurs, the MME can immediately recognize and prioritize the Paging signal without needing to analyze call details during the transmission decision.
3Reliability
If the radio base station eNodeB processes all connection requests equally, then the processing is simple, but connection requests for prioritized calls are discarded during congestion
Solution Approach 1:
The RRC Connection Request signal includes a priority identifier that acts as a visual marker. When the eNodeB receives this signal during congestion, it can quickly check for the priority identifier and preferentially process the connection request without needing to analyze the content or importance of each call, thus maintaining simple processing logic while achieving reliable prioritized call delivery.
4Reliability
If priority identifiers are included in all signaling messages, then prioritized calls can be preferentially processed, but the signaling message size and processing complexity increase
Solution Approach 1:
The patent applies partial action by including priority identifiers only when necessary - specifically when prioritized-call information is present in the Invite signal. The signaling messages include the minimum necessary priority information rather than excessive details, maintaining signal integrity while enabling prioritized processing. The priority identifier is added only to the extent needed to achieve preferential treatment during congestion.
Data Source
AI summary
A mobile communication method according to the present invention includes a step of establishing, by a session control node S/P-CSCF, a prioritized-call bearer between a gateway device P-GW and a mobile station UE when an Invite signal including prioritized-call information is received; a step of transmitting, by the session control node S/P-CSCF, the Invite signal including the prioritized-call information to the gateway device P-GW after the prioritized-call bearer is established; and a step of transmitting, by the gateway device P-GW, the Invite signal including the prioritized-call information to the mobile station UE.