Wireless Retransmission Packet Number Reset for Encryption Synchronization
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Solution Overview
Problem
In wireless local area networks, refragmentation during retransmission can lead to inappropriate encryption and decryption processes due to the need to reconfigure packets, causing synchronization issues between the transmitting and receiving stations.
Innovation Solution
A transmitting station with a fragmentation unit, packet number allocation unit, encryption unit, and retransmission control unit ensures proper encryption and decryption by resetting packet numbers and reconfiguring fragments during retransmission, synchronizing with the receiving station's packet management to maintain correct encryption and decryption processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If fragmentation is redone during retransmission to reconfigure packets, then retransmission control is improved, but encryption and decryption synchronization deteriorates
Solution Approach 1:
The transmitting station resets the first packet number to an initial value before retransmitting fragmented data, and the receiving station is requested to reset the second packet number to an initial value before decrypting. This preliminary reset action ensures that the packet number synchronization is maintained before the retransmission and decryption processes begin, preventing the synchronization issue that would otherwise occur during retransmission.
2Reliability
If packet numbers are reset during retransmission to maintain synchronization, then encryption and decryption reliability is improved, but retransmission efficiency deteriorates
Solution Approach 1:
The receiving station sends a response indicating whether the second packet number should be reset to an initial value. The transmitting station's retransmission control unit uses this feedback to determine whether to reset the first packet number. This feedback mechanism ensures that packet number reset operations are performed only when necessary for maintaining synchronization, avoiding unnecessary retransmissions and preserving retransmission efficiency while ensuring encryption and decryption reliability.
Data Source
AI summary
A transmitting station includes a fragmentation unit, a packet number allocation unit, an encryption unit, a wireless signal processing unit, and a retransmission control unit. The fragmentation unit divides data into fragments. The packet number allocation unit allocates a first packet number to the fragments. The encryption unit encrypts the fragments on the basis of the first packet number. The wireless signal processing unit transmits the fragments encrypted as a wireless signal to a receiving station. When retransmitting the data, the retransmission control unit instructs the packet number allocation unit to reset the first packet number to an initial value, requests the receiving station to reset a second packet number managed by the receiving station to an initial value for decryption of the fragments encrypted, and instructs the fragmentation unit to reconfigure an unsuccessfully transmitted fragment.