MME Barring Time for Network Congestion Avoidance
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Solution Overview
Problem
In LTE and GPRS systems, simultaneous disconnection of numerous bearers due to core network equipment failures leads to network congestion as UEs attempt to originate calls before the barring procedure is initiated.
Innovation Solution
A mobile communication method where a mobility management node or packet switch transmits a disconnection request signal with barring time to a mobile station, prompting the station to bar originating calls to the packet data network, thereby preventing network congestion during equipment failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bearers are established between a large number of UEs and a packet data network, then network connectivity is improved, but network congestion occurs when simultaneous disconnections happen due to equipment failures
Solution Approach 1:
The mobility management node or packet switch sends a disconnection request signal with barring time information to the mobile station before actually disconnecting the bearer. This preliminary action allows the mobile station to proactively bar outgoing calls during the barring period, preventing call storms and network congestion that would occur if all UEs simultaneously attempted to re-establish connections after a failure
Solution Approach 2:
The system applies preliminary anti-action by having the mobile station bar outgoing calls during the barring period. This counter-action prevents the harmful effect of simultaneous call origination that would cause network congestion, addressing the problem before it can manifest fully
2Object-generated harmful factors
If a disconnection request signal with barring time is transmitted to mobile stations, then network congestion is prevented, but call origination is blocked during the barring period
Solution Approach 1:
The system implements beforehand cushioning by introducing a barring period during which call origination is blocked. This cushioning period absorbs the shock of simultaneous disconnections and prevents call storms, sacrificing temporary call productivity to protect overall network stability and prevent congestion
Data Source
AI summary
Even if a failure has occurred in core network equipment in a state in which bearers are established between a large number of UEs and a packet data network, congestion in the network is avoided. A mobile communication method according to the present invention includes steps of transmitting, by an MME, to transmit a “PDN Disconnection Request/Detach Request” including barring time to a UE when the MME disconnects a bearer between the UE and the packet data network due to a predetermined reason such as a failure in a S-GW/P-GW or the MME in a state in which the bearer is established, and barring, by the UE, a mobile originating call directed to the packet data network for the barring time.