Dynamic DNS Cache TTL Management for Power Saving
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Solution Overview
Problem
Current consumer electronic devices, such as smartphones, experience repeated DNS queries due to small DNS cache timeout values (TTL values) provided by DNS servers, leading to increased power consumption and time in obtaining answers from DNS servers.
Innovation Solution
An electronic device manages a local DNS cache with multiple TTL values, including original and extended TTL values based on operating states, allowing for flexible extension of cache expiration times to reduce repeated queries and conserve power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If small DNS cache timeout values (TTL values) are used, then DNS cache entries expire quickly allowing frequent updates, but repeated DNS queries occur consuming extra power and time
Solution Approach 1:
The patent applies dynamics by making the DNS cache expiration time variable rather than fixed. The system dynamically adjusts the TTL value based on the device's current operating state (foreground vs. background). When in foreground state, the original TTL is used for timely updates. When in background state, an extended TTL is applied to reduce repeated queries and save power. This dynamic adaptation resolves the contradiction between cache freshness and power consumption.
Solution Approach 2:
The patent changes the parameter of TTL (time-to-live) value based on operating conditions. By detecting whether the application is in foreground or background state, the system modifies the TTL parameter accordingly - using original TTL in foreground and extended TTL in background. This parameter change allows the system to maintain DNS cache effectiveness while reducing unnecessary queries and power consumption in background states.
2Reliability
If small DNS cache timeout values are used, then DNS cache entries expire quickly allowing frequent updates, but repeated DNS queries consume extra time
Solution Approach 1:
The system dynamically adjusts DNS cache expiration behavior based on application state. In foreground state, original TTL ensures timely updates. In background state, extended TTL prevents premature expiration, allowing the cache to remain valid longer and avoiding repeated DNS queries that would consume time. This dynamic approach resolves the time loss issue while maintaining cache freshness when needed.
Solution Approach 2:
The TTL parameter is changed based on operating state detection. When the application transitions to background state, the system applies an extended TTL value that keeps DNS cache entries valid longer, reducing the frequency of DNS queries and the time spent waiting for DNS server responses. This parameter adaptation eliminates unnecessary time loss without compromising cache freshness in active use.
3Use of energy by moving object
If extended TTL values are used, then DNS query results can be obtained from local cache more frequently saving power, but DNS cache may become outdated
Solution Approach 1:
The system uses dynamic state detection to determine when to apply extended TTL. Only when the application is in background state (not actively using network resources) does the system extend the TTL to save power. When the application returns to foreground state, the original TTL is restored, ensuring DNS cache accuracy is maintained when the application actually needs up-to-date information. This dynamic switching resolves the contradiction between power saving and cache accuracy.
Solution Approach 2:
The TTL parameter is conditionally changed based on application state. In background state, extended TTL is applied to maximize power savings by reducing DNS queries. In foreground state, the original TTL is used to ensure cache accuracy. This conditional parameter change ensures that extended TTL is only used when it won't compromise DNS cache accuracy, thus resolving the contradiction between power saving and reliability.
Data Source
AI summary
A method for DNS processing is provided. The method is executed by an electronic device and includes the following steps: determining a plurality of TTL values, wherein each of the TTL values corresponds to one of a plurality of operating states of the electronic device, and determining whether to remove an entry from a local DNS cache in the electronic device or not according to the TTL value corresponding to the current state among the operating states of the electronic device.