Mobile IP Message Compression Using Change Mask Fields
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Solution Overview
Problem
Current wireless communication technologies face inefficiencies in compressing messages, particularly in mobile communications where resources are limited and expensive, especially in scenarios involving the Mobile IP protocol, where repeated transmissions of similar messages waste bandwidth due to unchanged information.
Innovation Solution
The implementation of a message compression mechanism that uses a 'compressed message' indicator and a mask field to efficiently transmit only changed information, allowing for the construction of new messages without explicit modification commands, leveraging a predetermined understanding between sender and receiver for decompression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional mobile IP messages are transmitted repeatedly, then complete information is communicated, but bandwidth is wasted due to transmission of unchanged information
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 be copied from the previous message. This is achieved by identifying which fields have changed and transmitting only those specific fields, thereby reducing bandwidth consumption while maintaining message completeness through the combination of transmitted changes and implied unchanged data.
Solution Approach 2:
The patent establishes a predetermined understanding between sender and receiver about how to decompress compressed messages, including the use of mask fields and field identification. This preliminary agreement allows the receiver to correctly reconstruct the complete message by combining the received changed fields with the previous message's unchanged fields, eliminating the need to transmit explicit decomposition commands.
2Loss of energy
If compressed messages are transmitted to reduce overhead, then bandwidth is conserved, but message complexity increases due to compression mechanisms
Solution Approach 1:
The patent segments the mobile IP message into unchanged fields (implied from previous message) and changed fields (explicitly transmitted). A mask field is used to indicate which fields have changed. This segmentation allows the receiver to efficiently reconstruct the complete message by combining the transmitted segment with the implied segment, reducing bandwidth while keeping the compression mechanism relatively simple through clear field differentiation.
Solution Approach 2:
The patent applies different transmission qualities to different fields: changed fields are transmitted explicitly with full detail, while unchanged fields are transmitted implicitly by reference to the previous message. This local quality differentiation optimizes bandwidth usage by applying compression only where necessary (changed fields) while maintaining simplicity for unchanged fields, balancing compression efficiency with mechanism complexity.
Data Source
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.