Mobile IP Message Compression Using Masked Changed Fields
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Solution Overview
Problem
Current message compression techniques in wireless communications, particularly for mobile IP protocols, are inefficient as they require retransmitting unchanged fields, wasting resources and bandwidth due to the lack of effective methods for compressing repeated messages.
Innovation Solution
The implementation of a compression mechanism that uses a 'compressed message' indicator and a mask field to efficiently transmit only changed information, allowing the receiver to decompress messages without explicit modification commands, by leveraging a predetermined understanding between the sender and receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional mobile IP messages are transmitted multiple times with all fields retransmitted, then message reliability is maintained, but communications resources and bandwidth are wasted due to redundant transmission of unchanged fields
Solution Approach 1:
The patent extracts only the changed fields from the mobile IP message and transmits them separately, while the unchanged fields are implied to remain the same as in the previous message. This is achieved by identifying which fields have changed and transmitting only those specific fields, thereby eliminating redundant transmission of unchanged content while maintaining message integrity.
Solution Approach 2:
The receiver stores a copy of the previous mobile IP message before receiving the current message. This preliminary storage action enables the receiver to compare the current message with the stored previous message and identify only the changed fields, allowing efficient compression and reducing the amount of data that needs to be transmitted.
2Loss of information
If all fields are retransmitted in each mobile IP message, then complete message information is ensured, but message overhead increases and bandwidth efficiency decreases
Solution Approach 1:
The patent extracts and transmits only the changed fields from the mobile IP message, while the unchanged fields are implied to remain the same as in the previous message. This extraction approach ensures that complete message information is reconstructed at the receiver by combining the transmitted changed fields with the stored previous message, while significantly reducing message overhead.
Solution Approach 2:
Instead of transmitting all fields (excessive action), the patent transmits only the necessary changed fields (partial action). This partial transmission is sufficient to maintain message information completeness because the receiver can reconstruct the full message by combining the transmitted changed fields with the stored previous message, thereby reducing message overhead without losing information.
3Productivity
If compression techniques are applied to mobile IP messages, then bandwidth efficiency is improved, but device complexity increases due to compression and decompression processing
Solution Approach 1:
The compression mechanism extracts only the changed fields from the mobile IP message and transmits them with an indicator specifying which fields have changed. The decompression process uses this indicator to identify and update only the changed fields in the stored previous message, reconstructing the current message. This approach improves bandwidth efficiency while keeping processing complexity manageable by focusing only on changed portions rather than entire messages.
Solution Approach 2:
The system uses the previously stored message as a reference for decompression, allowing the receiver to self-serve in reconstructing the current message by combining the transmitted changed fields with the stored previous message. This self-service approach reduces the need for complex decompression algorithms while maintaining bandwidth efficiency.
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AI summary
Methods and apparatus for compressing messages used to support mobile communications are described. After transmission of a first mobile IP message which may be a conventional mobile IP message, a compressed mobile IP message is transmitted. The compressed message includes a new "compressed message" indicator and information which is to replace information in the previous message or to be added to the previous message to construct a new message. In some embodiments, the compressed message includes a mask field, e.g., a sequence of bits, each bit corresponding to one field of a standard registration request message or binding update message. If the mask flag bit corresponding to a field is set, it indicates that the compressed message includes information to replace the content in the corresponding field of the previous message or to be added to the previous message as a field corresponding to the asserted bit.