NAS Signaling Flag for Extended Message Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing mobile radio communications network technology faces limitations in the size of initial Non-Access Stratum (NAS) messages, particularly the LOCATION UPDATING REQUEST message, which is restricted to twenty octets, hindering the addition of new information due to the lack of available octets for further extension, especially in GSM operations.
Innovation Solution
A flag is introduced in the NAS signaling structure to indicate the availability of extended NAS messaging, allowing additional information to be conveyed in a separate message, maintaining the original message length and enabling future protocol enhancements without increasing the initial message size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the LOCATION UPDATING REQUEST message includes all required information elements (CSMT flag, CSMO flag, device properties), then the message content is complete, but the message size exceeds the twenty-octet limit of the SDCCH information field
Solution Approach 1:
The patent divides the location updating information into two separate messages: the original LOCATION UPDATING REQUEST message (limited to 20 octets) and a new EXTENDED LOCATION UPDATING REQUEST message (containing additional information elements). This segmentation allows the system to maintain compliance with the SDCCH information field size limit while providing a mechanism to transmit extended information when needed.
Solution Approach 2:
The patent introduces a new dimension to the signaling structure by adding an extended message format that operates alongside the original message format. The extended message is triggered by a specific information element (information element 17) in the original message, creating a multi-layered information transmission approach that bypasses the original size constraint.
2Adaptability or versatility
If the message size is increased to accommodate future information elements, then adaptability is improved, but compatibility with existing SDCCH constraints is lost
Solution Approach 1:
The patent creates a dynamic message structure where the information element format can adapt to different scenarios. The system can operate in two modes: using the original 20-octet message format for compatibility, or activating the extended message format when the information element 17 indicates additional information is available. This dynamic approach allows the protocol to maintain compliance while providing extensibility.
Solution Approach 2:
The patent prepares for future information requirements by pre-defining the extended message structure and the trigger mechanism (information element 17) in the original message. This preliminary action ensures that when new information elements are needed, the system can immediately utilize the pre-established extension mechanism without requiring protocol changes, thus maintaining both compliance and adaptability.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The present invention provides for a mobile radio communications device operative to signal a non-access stratum message to a mobile radio communications network device, for establishing and/or maintaining network connection, the device being arranged to include within the message a flag indicating the availability of extended NAS messaging found within an additional message separate from, but forming an extension to the non-access stratum message, and also for a signaling structure to be employed by such a device and a network device for exchanging signaling therewith and of course to related methods of such devices.