Mobility Management Backoff Control for Forbidden-Area Service Requests
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Solution Overview
Problem
In satellite communication scenarios, terminal devices continuously send registration or PDU session establishment requests due to lack of tracking area information, leading to high power consumption and network load.
Innovation Solution
A communication method and apparatus that includes determining a terminal device's position and rejecting service requests within forbidden areas, using a mobility management network element to provide parameters for delaying subsequent requests, reducing unnecessary transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device continuously sends registration request information or PDU session establishment request information to the AMF when service requests are rejected, then the terminal device can attempt to establish service again, but the power consumption of the terminal device increases and the network load increases
Solution Approach 1:
The terminal device transitions from continuous request sending to periodic request sending based on the backoff parameter. The device determines a backoff timer value from the second parameter received in the rejection message, and only sends new service requests when the backoff timer expires or when moving out of the restricted area, thereby reducing unnecessary transmissions and power consumption while maintaining service establishment attempts
Solution Approach 2:
The AMF provides feedback to the terminal device by including the second parameter (backoff indicator) in the service rejection message. This feedback mechanism allows the terminal device to adjust its request sending behavior based on network conditions and area restrictions, preventing continuous requests and reducing both power consumption and network load
2Reliability
If the terminal device continuously sends registration request information or PDU session establishment request information to the AMF when service requests are rejected, then the terminal device can attempt to establish service again, but the network load increases
Solution Approach 1:
The terminal device implements periodic request sending behavior by using the backoff timer mechanism. Instead of continuously sending requests, the device waits for the backoff timer to expire or for area restriction conditions to change before sending new requests, thereby reducing network load while maintaining the ability to establish services when conditions permit
Solution Approach 2:
The network provides feedback through the second parameter in rejection messages, enabling the terminal device to self-regulate its request rate. This feedback loop reduces unnecessary network traffic and load while preserving the terminal's ability to establish services when network conditions and area restrictions allow
3Adaptability or versatility
If the access network device does not broadcast tracking area information in satellite communication scenarios, then the terminal device cannot obtain TA information, but the terminal device continuously sends requests leading to high power consumption
Solution Approach 1:
The network pre-configures area restriction information and backoff parameters in rejection messages before the terminal device would otherwise continuously send requests. This preliminary action provides the terminal with the necessary guidance to reduce unnecessary transmissions and power consumption in satellite communication scenarios where traditional tracking area broadcasting is not available
Solution Approach 2:
The network provides feedback mechanisms through rejection messages containing backoff parameters and area restriction information. This feedback enables the terminal device to adapt its behavior in satellite communication scenarios, reducing power consumption by avoiding continuous requests while maintaining the ability to establish services when conditions permit
Data Source
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AI summary
This application provides a communication method, a communication apparatus, and a communication system. The method includes: A mobility management network element obtains request information and position information that are of a terminal device from an access network device, where the request information is used by the terminal device to request to perform a service, and the position information indicates a position of the terminal device when the terminal device sends the request information. When determining that the position is in an area in which performing of the service is forbidden, the mobility management network element may reject the request information, and send response information indicating that the request information is rejected to the terminal device through the access network device, where the response information includes a parameter used by the terminal device to determine sending time of another piece of request information that is also used to request to perform the service. According to the foregoing technical solution, in this application, the terminal device does not continuously send new request information to the mobility management network element after request information for requesting to perform a specific service is rejected, so that power consumption of the terminal device can be reduced.