Local Service Access Retry Using Validity-Based Backoff
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Solution Overview
Problem
Terminals rejected from accessing localized services due to network congestion or authorization issues are unable to initiate NAS signaling requests within a long back-off timer period, leading to communication performance degradation.
Innovation Solution
Implementing a first back-off timer based on the validity time of the localized service network, allowing terminals to perform non-public network selection or retry signaling requests after the timer expires, thereby avoiding prolonged communication disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network assigns a long back-off timer to rejected terminals to reduce signaling load, then network congestion is alleviated, but the terminal cannot access the localized service within its validity time
Solution Approach 1:
The back-off timer value is made dynamic rather than fixed. The network determines the back-off timer value based on the remaining validity time of the localized service, adjusting the timer duration to match the service lifecycle. This ensures the terminal can retry access before the service expires while still implementing congestion control.
Solution Approach 2:
The back-off timer parameter is changed from a fixed long duration to a variable duration based on service validity time. By changing this key parameter, the system balances between reducing signaling load and enabling timely service access within the validity period.
2Productivity
If multiple terminals request localized service simultaneously at the same location, then service demand is met, but signaling load increases significantly causing network rejection
Solution Approach 1:
Terminals implement periodic retry actions based on the back-off timer rather than continuous or simultaneous requests. This spreads out the signaling load over time, reducing peak network congestion while still allowing multiple terminals to eventually access the service within its validity period.
Solution Approach 2:
The system maintains continuous service availability by ensuring terminals can retry access throughout the service validity period. The back-off timer mechanism allows continuous but controlled access attempts, ensuring service productivity is maintained without overwhelming the network.
3Adaptability or versatility
If the terminal performs non-public network selection after rejection, then alternative network access is achieved, but service access time increases
Solution Approach 1:
The terminal performs non-public network selection as a preliminary action immediately upon receiving rejection, before starting the back-off timer. This allows the terminal to explore alternative networks in parallel with the back-off mechanism, reducing overall access time while maintaining adaptability.
Data Source
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AI summary
The embodiments of the present application belongs to the technical field of communications. Disclosed are a local service communication method, and a terminal and a network-side device. The local service communication method in the embodiments of the present application comprises: a terminal sending a first message, wherein the first message is used for requesting for a local service; the terminal receiving a rejection message, wherein the rejection message is used for indicating that the request for the local service is rejected; and the terminal executing non-public network selection; or the terminal turning on a first backoff timer, wherein the terminal does not send the first message during the operation of the first backoff timer, and the value of the first backoff timer is determined on the basis of a valid time of a network that provides the local service.