Wi-Fi Direct Communication Apparatus IP Overlap Control
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Solution Overview
Problem
In wireless LAN communication using Wi-Fi Direct, there is a mismatch in the start timings of data communication between devices, leading to data retransmission and transmission timeouts due to incomplete IP address overlap confirmation before setting IP addresses in the network interface.
Innovation Solution
A communication apparatus that forms a wireless network and controls the start timing of data communication based on role information, using a service start determination unit to delay the start of data communication until IP address overlap confirmation is complete, thereby preventing mismatches and retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the P2P Client starts data communication immediately after IP address distribution processing, then the service can start quickly, but the P2P Client may not have completed IP address overlap confirmation, causing communication mismatches and retransmissions
Solution Approach 1:
The patent applies preliminary action by having the P2P Client perform IP address overlap confirmation using GARP before the P2P GO starts data communication. The P2P Client sends GARP packets to confirm no IP address conflicts exist, and only after this confirmation is complete does the system proceed to start data communication. This ensures the network interface is fully ready to receive data, preventing retransmissions and communication failures.
2Reliability
If the P2P Client performs IP address overlap confirmation before setting the IP address in the network interface, then IP address conflicts are detected, but the P2P Client cannot receive data for the service, requiring data retransmission
Solution Approach 1:
The patent resolves this contradiction by performing the IP address overlap confirmation as a preliminary action before data communication starts. The P2P Client sends GARP packets to verify IP address uniqueness, and only after receiving no conflicting responses does it proceed to set the IP address in the network interface and start data communication. This sequencing eliminates the need for retransmission while maintaining reliability.
Solution Approach 2:
The system uses feedback from GARP packet responses to determine whether to proceed with data communication. If no ARP Reply is received in response to GARP packets, this feedback confirms the IP address is unique and the network interface is ready. This feedback mechanism ensures data is sent only when the receiver is prepared, preventing retransmissions.
3Adaptability or versatility
If the GARP transmission count and period are set depending on implementation, then flexibility is provided, but the start timing of data communication becomes unpredictable, causing mismatches
Solution Approach 1:
The patent uses feedback from the GARP transmission process to dynamically determine when data communication should start. The P2P GO monitors whether the P2P Client has completed GARP transmissions and received appropriate responses. Based on this feedback, the P2P GO adjusts the start timing of data communication to ensure synchronization, resolving the timing mismatch problem while allowing implementation flexibility in the number and period of GARP transmissions.
Data Source
AI summary
A communication apparatus, comprises a forming unit configured to form a wireless network with another communication apparatus; and a control unit configured to control a start timing of data communication with the other communication apparatus based on role information of the communication apparatus in the wireless network.