M2M Device Network Access Control via RF Monitoring
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Solution Overview
Problem
In 4G LTE networks, a large number of M2M devices connecting simultaneously can lead to network overload, degrading the quality of service (QoS) due to increased load on access networks, and attempts to connect further exacerbate this issue with additional control and overhead messages.
Innovation Solution
M2M devices monitor radio frequency (RF) signals to determine current network usage without connecting, comparing it to a usage threshold to decide whether to connect and upload data, thereby preventing overload by avoiding congested networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If M2M devices connect to the access network to communicate data, then data transmission capability is improved, but network load increases causing overload and QoS degradation
Solution Approach 1:
The system performs preliminary actions by monitoring RF signals and determining network usage conditions before M2M devices attempt to connect. The network controller identifies when network usage is below thresholds and proactively indicates available uplink resources, allowing devices to connect only when conditions are favorable, thus preventing overload while enabling data transmission.
Solution Approach 2:
The system implements feedback mechanisms where the network controller continuously monitors network usage conditions and provides feedback to M2M devices about resource availability. This feedback loop allows devices to adjust their connection behavior based on real-time network conditions, ensuring data transmission occurs only when it won't degrade QoS.
2Reliability
If M2M devices monitor RF signals to determine network usage, then network overload is prevented, but connection attempts still create control and overhead messages that add to network load
Solution Approach 1:
The system extracts the essential network status information from complex RF signals and transmits only the necessary connection authorization indicators and resource allocation information. This extraction approach allows M2M devices to determine network conditions without requiring full connection handshakes, reducing control and overhead messages while maintaining overload prevention.
3Productivity
If multiple M2M devices connect simultaneously to upload data, then data transmission speed is improved, but co-channel interference increases degrading network performance
Solution Approach 1:
The system applies local quality by allocating specific uplink resources to specific M2M devices based on their individual connection authorizations. Instead of allowing all devices to transmit simultaneously on all channels, the network controller assigns targeted resource blocks, enabling parallel transmission while minimizing co-channel interference through localized resource allocation.
Solution Approach 2:
The system implements periodic action by having M2M devices transmit data in scheduled intervals based on resource allocations from the network controller. Devices upload data during their assigned time slots rather than continuously or simultaneously, which maintains overall data transmission throughput while reducing peak interference levels through time-division multiplexing.
Data Source
AI summary
A device receives a pilot channel from an access network, without connecting to the access network. The pilot channel includes information identifying an actual usage associated with the access network. The device determines whether the actual usage of the access network is greater than a particular usage associated with the access network, and selectively connects to the access network based on whether the actual usage of the access network is greater than the particular usage. The device connects to the access network, to provide data to a core network, when the actual usage of the access network is not greater than the particular usage. The device does not connect to the access network when the actual usage of the access network is greater than the particular usage.