Remote Photography Terminal Discovery Under Multicast Restrictions
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Solution Overview
Problem
Existing remote photographing methods face challenges in establishing connections between photographing and remote control terminals due to increased router workload from UDP broadcasting, which is often restricted by routers, leading to unreliable connections.
Innovation Solution
The method employs a unicast message to traverse and determine the host internet protocol address range of a second terminal within a local area network when multicast is abnormal, ensuring a stable connection by bypassing multicast limitations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UDP broadcasting is used to discover remote control terminals, then terminal discovery capability is improved, but router workload increases and connection reliability deteriorates due to multicast restrictions
Solution Approach 1:
The patent changes the communication parameter from UDP broadcasting (multicast) to TCP unicast communication. This parameter change resolves the contradiction by eliminating router workload issues and multicast restrictions while maintaining terminal discovery capability through active scanning based on host IP address ranges.
Solution Approach 2:
The patent introduces an intermediary approach where the photographing terminal actively scans for remote control terminals using TCP unicast messages within a determined IP address range, rather than relying on passive UDP broadcasting. This intermediary scanning mechanism ensures reliable connection establishment while reducing router workload.
2Adaptability or versatility
If UDP broadcasting is used for terminal discovery, then network coverage is improved, but device complexity and router processing burden increase
Solution Approach 1:
The patent extracts the terminal discovery function from the router by implementing active scanning at the application layer on the photographing terminal itself. This removes the broadcasting burden from the router, reducing its processing complexity while maintaining network coverage through systematic IP range scanning.
Solution Approach 2:
The photographing terminal performs self-service terminal discovery by actively scanning IP address ranges and initiating TCP connections without relying on router-based UDP broadcasting. This self-service approach reduces router processing burden while achieving comprehensive terminal discovery.
3Object-affected harmful factors
If multicast is restricted by routers, then network security is improved, but terminal connection reliability deteriorates
Solution Approach 1:
The patent inverts the traditional approach by not relying on multicast broadcasting for terminal discovery. Instead, it determines the host IP address range and actively scans for terminals using unicast TCP connections. This inversion bypasses multicast restrictions while maintaining connection reliability and aligns with enhanced network security policies.
Data Source
AI summary
A remote photographing method and apparatus, an electronic device and a computer-readable storage medium. The remote photographing method includes: receiving, by a first terminal, a remote photographing request used for instructing the first terminal to search for a second terminal, the second terminal being used for sending a photographing instruction to the first terminal; determining, by the first terminal, a host internet protocol address range of the second terminal in a local area network corresponding to a wireless network or a hotspot accessed by the first terminal in response to multicast of the local area network being abnormal; and sending, by the first terminal, a unicast message to the second terminal according to the host internet protocol address range of the second terminal, the unicast message being used for requesting acquisition of information of the second terminal in the local area network.