MTC Device Congestion Control via PS CS Domain Segmentation
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Solution Overview
Problem
Machine Type Communication (MTC) devices and low priority devices experience indeterminate service network behaviors due to congestion in the Packet-Switched (PS) domain, leading to connection rejections and inefficient resource management during peak loads, as existing solutions do not effectively differentiate between PS and Circuit-Switched (CS) domain congestion.
Innovation Solution
A mobile communication device and method for congestion control that includes a wireless module and a controller module, which transmit connection requests for both PS and CS domains, and respond to connection rejection or release messages with extended wait timers, allowing the device to initiate CS domain procedures while avoiding PS domain access during congestion, thereby optimizing resource allocation and reducing network load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If MTC devices transmit connection requests for both PS and CS domains during congestion, then service establishment may be achieved, but network load increases and congestion worsens
Solution Approach 1:
The patent segments the connection establishment process into separate PS domain and CS domain procedures. When PS domain congestion is detected, the device separates the location registration into CS domain only, avoiding combined procedures that would increase network load. This segmentation allows selective access to non-congested domains while maintaining service establishment reliability.
Solution Approach 2:
The patent changes the procedural parameter of location registration from combined (PS+CS) to CS-only when PS domain congestion is detected. This parameter change adapts the access strategy based on network conditions, reducing harmful network load while maintaining reliable service establishment through alternative domain access.
2Object-generated harmful factors
If MTC devices wait for extended wait timer before CS domain access, then PS domain congestion is avoided, but service establishment time increases
Solution Approach 1:
The patent segments the location registration procedure to allow CS domain access independently of PS domain congestion status. By separating CS domain procedures from PS domain procedures, devices can immediately access CS domain services without waiting for extended wait timers, reducing service establishment time while avoiding PS domain congestion.
Solution Approach 2:
Instead of waiting for PS domain congestion to clear before accessing services, the patent inverts the approach by immediately accessing CS domain services that are not congested. This inversion of access strategy eliminates unnecessary waiting time while avoiding exacerbation of PS domain congestion.
3Adaptability or versatility
If combined attachment procedure is used for PS and CS domains, then service coverage is improved, but network load increases during congestion
Solution Approach 1:
The patent segments the combined attachment procedure into separate PS and CS domain procedures. When PS domain congestion is detected, the device performs CS domain location registration independently without initiating combined procedures. This segmentation maintains service coverage through alternative domain access while reducing network load by avoiding redundant signaling in congested domains.
Solution Approach 2:
The patent applies partial action by performing only CS domain location registration when PS domain congestion is detected, rather than executing the full combined attachment procedure. This partial execution of the attachment procedure maintains essential service coverage while avoiding excessive network load generation from unnecessary PS domain signaling attempts.
Data Source
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AI summary
A mobile communication device configured for Machine Type Communication (MTC) or configured as a low priority device is provided. In the mobile communication device, a wireless module performs wireless transmissions and receptions to and from a service network, and a controller module transmits a connection request message to the service network via the wireless module in response to initiating a combined attachment procedure or a combined routing area update procedure for both Packet-Switched (PS) and Circuit-Switched (CS) domains, and receives a connection rejection message with an indication of an extended wait timer from the service network via the wireless module. Also, the controller module initiates a location registration procedure for the CS domain or enters a substate in which initiation of the location registration procedure for the CS domain is allowed, in response to the connection rejection message for the PS domain.