Beacon Frame TSF Offset for Wireless Sync
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Solution Overview
Problem
Current wireless communication standards, such as IEEE 802.11, face synchronization issues due to the encryption of entire beacon frames when the timing synchronization function (TSF) value changes, leading to decryption delays and potential synchronization problems.
Innovation Solution
Implementing a separate encryption process for the TSF value by applying an offset to the TSF field, allowing the beacon frame to be transmitted without encrypting the TSF, thus maintaining synchronization even if the TSF value changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire beacon frame is encrypted when the TSF value changes, then security is improved, but decryption delays occur and synchronization problems arise
Solution Approach 1:
The beacon frame is segmented into two parts: the TSF field which remains unencrypted for immediate synchronization, and the remaining beacon frame content which is encrypted for security. This segmentation allows the system to achieve both fast synchronization and secure communication without the trade-off present in full encryption approaches.
Solution Approach 2:
The TSF field is extracted from the encrypted portion of the beacon frame and handled separately. By taking out the timing-critical TSF field from the encryption process, the patent enables receivers to obtain synchronization information immediately without waiting for decryption, while the rest of the beacon frame maintains encryption for security.
2Reliability
If the entire beacon frame is encrypted, then security is improved, but device complexity increases due to separate encryption processes
Solution Approach 1:
The encryption process is merged with the existing beacon frame generation process at the MAC layer. Instead of implementing a separate encryption step, the patent integrates encryption into the normal beacon frame construction, reducing additional complexity while maintaining security. The TSF field is simply excluded from the encryption operation rather than requiring a separate handling mechanism.
Data Source
AI summary
Techniques are disclosed for obfuscation in a privacy beacon. An example method includes a first communication device creating a beacon field to be included in a beacon frame. The first communication device can generate a timing synchronization field to be included in the beacon frame. The first communication device can apply an offset to the timing synchronization field of the beacon frame. The first communication device can transmit the beacon frame to a second communication device, the beacon frame comprising the offset timing synchronization field and the beacon field.