Access Barring for Emergency Calls and MTC Devices
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Solution Overview
Problem
Mobile communication systems face network instability due to sudden increases in load from Machine Type Communications (MTC) devices, leading to failed initial access for terminals, as existing access barring techniques are inadequate in managing diverse MTC characteristics and emergency calls.
Innovation Solution
Implementing an advanced access barring technique that allows for emergency calls and Machine Type Communications (MTC) devices to transmit Extended Access Barring (EAB) information, enabling dynamic control of network access based on emergency call types and operator-specific settings, thereby managing network congestion and reducing system load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If normal access barring technique is used to control radio network load, then system load is reduced, but emergency call access and diverse MTC access are restricted
Solution Approach 1:
The access barring technique is segmented into multiple independent barring mechanisms: normal access barring for general traffic, extended access barring (EAB) for MTC devices, and emergency call barring for emergency services. Each mechanism operates independently with its own parameters and target device types, allowing selective application based on traffic type and network conditions.
Solution Approach 2:
The access barring system is made dynamic by allowing the base station to selectively apply different barring techniques based on real-time network load conditions and device types. The system can dynamically adjust which barring mechanism is active and modify parameters such as barring factors and time periods according to current traffic patterns and network status.
2Stability of the object's composition
If access barring is applied to control MTC device access, then network stability is improved, but emergency call access may be inadvertently restricted
Solution Approach 1:
Different quality levels of access control are applied to different service types. Emergency calls receive preferential treatment with separate barring parameters and higher priority, while MTC devices subject to extended access barring with more restrictive parameters. The system locally optimizes access control for each service type based on its specific requirements.
Solution Approach 2:
The access barring mechanism acts as an intermediary layer between the base station and various device types. It mediates access requests by evaluating device type, service type, and network conditions, then applying appropriate barring parameters. This intermediary function ensures that emergency calls are properly prioritized while still controlling overall MTC access.
3Area of stationary object
If multiple MTC devices access simultaneously, then network coverage is utilized, but access network load increases abruptly causing instability
Solution Approach 1:
The extended access barring mechanism introduces periodic control through time-based parameters such as barring time periods and retry intervals. MTC devices are barred from accessing during high-load periods and can attempt access again after specified time intervals, creating a periodic access pattern that smooths out abrupt load increases while maintaining network coverage.
Data Source
AI summary
The present invention relates to a method and apparatus for efficiently controlling access for system load adjustment in mobile communication systems. A method for transmitting and receiving data by a terminal including a user equipment (UE) non access stratum (NAS) and a UE access stratum (AS) includes the steps of: receiving by the UE AE, information including emergency call-related information which includes barring information by type for the emergency call, from a base station; transmitting, by the UE NAS, a service request for the emergency call to the UE AS; and determining, by the UE AS, whether to bar the service request on the basis of emergency call-related information. During an emergency call transmission, network congestion can be easily controlled by enabling various types of emergency calls to be transmitted, and enabling access to be barred information according to the situation of a communication network and types of emergency calls.