MTC Device Access Control via Network Criteria
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Solution Overview
Problem
The increasing number of Machine-Type Communication (MTC) devices poses a challenge for cellular radio networks, as they often roam and generate low data volume, leading to potential network overload, which existing technologies do not adequately address, resulting in increased network complexity and resource wastage.
Innovation Solution
Implementing an enhanced Access Class Barring scheme that allows MTC devices to identify themselves as low-throughput devices, enabling them to register with cellular networks and adjust their transmission patterns, thereby preventing network overload and optimizing resource usage by specifying criteria for network access and using Subscriber Identity Modules (SIMs) to manage preferred network lists.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If MTC devices are allowed to access the cellular network without restrictions, then network coverage and device connectivity are improved, but network overload and resource wastage occur
Solution Approach 1:
The network performs preliminary actions by broadcasting access control instructions before MTC devices attempt random access. The network pre-defines criteria (such as time windows, geographic areas, or device categories) that determine when and where MTC devices should be barred from accessing the network, preventing overload before it occurs.
Solution Approach 2:
MTC devices autonomously evaluate the broadcasted criteria against their own operational context and self-adjust their access behavior. The devices independently determine whether to transmit access requests or remain barred based on the received instructions, eliminating the need for continuous network control signaling.
2Productivity
If Access Class Barring is implemented to prevent network overload, then network resource efficiency is improved, but device connectivity and network coverage are reduced
Solution Approach 1:
The access barring mechanism transitions from static to dynamic control. The network can update broadcasted criteria in real-time based on current network load conditions, allowing the barring parameters to adapt dynamically. This enables the system to maintain high connectivity when the network is healthy while enforcing restrictions only when necessary.
Solution Approach 2:
Access control is applied locally rather than uniformly across the entire network. The network can specify different criteria for different geographic areas, time periods, or device types, allowing MTC devices in unaffected areas to maintain normal connectivity while restricting access only in overloaded regions.
3Reliability
If MTC devices transmit frequently to ensure network registration, then device reliability is improved, but network overload increases
Solution Approach 1:
Instead of continuous or frequent transmission attempts, MTC devices are instructed to perform periodic registration only during specific time windows when the network is less loaded. The broadcasted criteria include time-based restrictions that synchronize device registration bursts with network capacity availability, distributing load over time.
4Area of stationary object
If network operators dimension networks to handle all MTC devices, then network coverage is improved, but network complexity and cost increase
Solution Approach 1:
The patent introduces an intermediary control mechanism (broadcasted criteria) that mediates between MTC devices and the network core. This intermediary layer enables the network to manage large numbers of MTC devices without requiring proportional increases in core network capacity, as the access control logic is distributed to the radio access network level.
Data Source
Figure 1
AI summary
The invention relates to operating a Machine-Type Communication (MTC) device for communication with a cellular radio network. A transmission is made from the MTC device to the cellular radio network to register the MTC device with the cellular radio network. The transmission includes a message from the MTC device to the cellular radio network, identifying the MTC device as an MTC device to the cellular radio network. Also, the MTC device has an associated HPLMN. An instruction is received at the MTC device from the network not to make a transmission from the MTC device for accessing the network. The instruction specifies a criteria for the MTC device's HPLMN or preferred list of networks. The MTC Device compares the criteria with the HPLMN associated with the MTC device and avoids making a transmission to access the network for a period of time based on the result comparing step.