Communication Device LAN WAN Detection Check Packet

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Solution Overview

Problem

Current methods lack a reliable way to determine whether data communication is taking place over a local area network (LAN) or a wide area network (WAN) using IP protocols, which is essential for preventing the illegal distribution of copyrighted content data.

Innovation Solution

A telecommunications apparatus and method that transmit check packets with sequence information, receive and check their sequence, and determine the network type based on the sequence integrity or elapsed time, allowing differentiation between LAN and WAN communications.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If IP protocols are used for data communication, then communication versatility and speed are improved, but the ability to distinguish between LAN and WAN communications deteriorates

Engineering Contradiction:

Improvecommunication versatilityVSAvoidnetwork type detection difficulty

Core Design Contradiction:

Adaptability or versatilityVSDifficulty of detecting and measuring

Solution Approach 1:

The patent applies preliminary action by transmitting check packets with sequence numbers before actual content data transmission. These check packets serve as a preliminary probe to determine network type (LAN or WAN) before the main communication begins, allowing the system to prepare appropriate security measures in advance based on the detected network type.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent uses check packets as an intermediary mechanism to indirectly determine network type. Instead of directly analyzing complex network routing information, the system sends simple check packets and observes their transmission characteristics (whether sequence numbers are preserved), using these observations as a mediator to infer the network type without requiring direct network analysis.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If content data is distributed over WAN, then access flexibility is improved, but copyright protection deteriorates

Engineering Contradiction:

Improveaccess flexibilityVSAvoidcopyright infringement

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent implements feedback by having the receiving end send back acknowledgment information about the check packets. The transmitting end uses this feedback to determine whether the communication should proceed with full content data transmission or be restricted. This feedback mechanism allows dynamic control of content distribution based on the detected network type, preventing unauthorized WAN distribution while maintaining legitimate access.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent applies preliminary anti-action by detecting network type before content transmission and taking preventive measures against unauthorized distribution. By identifying WAN connections in advance through check packets, the system can preemptively restrict content data transmission to prevent copyright infringement, rather than reacting after infringement occurs.

Inventive Principle:

Principle #9Preliminary anti-action

3Measurement precision

If check packets are transmitted to determine network type, then network detection accuracy is improved, but communication overhead increases

Engineering Contradiction:

Improvenetwork detection accuracyVSAvoidcommunication overhead

Core Design Contradiction:

Measurement precisionVSQuantity of substance

Solution Approach 1:

The patent applies segmentation by dividing the communication process into distinct phases: first transmitting check packets to determine network type, then proceeding to content data transmission only if appropriate. This segmentation allows the system to use minimal overhead check packets for detection while avoiding unnecessary content transmission over unauthorized networks, thus reducing overall communication overhead despite the additional detection step.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS7626943B2Communication device, communication method, recording medium and program

Publication Date: 2009.12.01 SONY GROUP CORP

AI summary

A data transmitting apparatus includes a transmitting unit that transmits a check packet to a data receiving apparatus, and a control unit that receives an acknowledgement message to the check packet. The acknowledgement message includes acknowledgement information based on shared data shared with the data receiving apparatus. The transmitting apparatus also includes a timer configured to determine whether a response time of the acknowledgement message is less than a predetermined time and a judgment unit that judges whether a subsequent content data transmitted to the data receiving apparatus will be limited in usage right based on a comparison result and the determination of the timer. If the acknowledgement message is not received, the judgment unit determines that the data receiving apparatus is connected to the data transmitting apparatus through a second network and subsequent content data transmitted is limited in usage right.