Mobile Station CELL UPDATE Message Adaptation
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Solution Overview
Problem
Conventional UTRAN schemes in Release 0.6 limit mobile stations to transmitting only 20 bytes in a CELL UPDATE message, and these stations cannot function properly in radio access networks that do not support Additional Dynamic Transport Format Information for CCCH, leading to transmission failures.
Innovation Solution
A mobile station equipped with a transmitting unit that determines the support for Additional Dynamic Transport Format Information for CCCH in the radio access network and only includes specific information elements in the CELL UPDATE message when the network supports this feature, allowing for transmission of messages with data amounts exceeding 20 bytes when capability and network support are confirmed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If mobile stations transmit CELL UPDATE messages with information elements exceeding 20 bytes, then the message includes additional dynamic transport format information, but the message cannot be transmitted in radio access networks that do not support this additional transport format
Solution Approach 1:
The mobile station dynamically adjusts the transport format of the CELL UPDATE message based on network capability detection. When the network supports additional transport format, the message includes information elements exceeding 20 bytes; when the network does not support it, the message is limited to 20 bytes or less. This dynamic adaptation resolves the contradiction between information completeness and network compatibility.
Solution Approach 2:
The patent changes the parameter of message size by detecting network support for additional transport format. Based on this detection, the mobile station modifies the data amount parameter of the CELL UPDATE message to either include or exclude additional information elements, thereby adapting to different network capabilities and resolving the compatibility issue.
2Reliability
If mobile stations are configured to always include additional information elements in CELL UPDATE messages, then message completeness is improved, but transmission failure occurs in networks not supporting additional transport format
Solution Approach 1:
The mobile station performs preliminary detection of network capability support for additional transport format before transmitting the CELL UPDATE message. Based on this advance detection, the mobile station prepares the appropriate message format, ensuring that the message will be successfully transmitted without causing network errors while including the necessary information elements.
Solution Approach 2:
The mobile station uses feedback from network capability detection to adjust its transmission behavior. By detecting whether the network supports additional transport format and accordingly adjusting the message content, the system ensures reliable transmission while maintaining information completeness where possible.
Data Source
AI summary
To transmit a “CELL UPDATE message” in a radio access network not supporting “Additional Dynamic Transport Format Information for CCCH,” a mobile station UE according to the present invention includes a transmitting unit 13 configured to transmit a “CELL UPDATE message” to a radio access network in a “CELL UPDATE procedure,” and the transmitting unit 13 includes a predetermined information element in the “CELL UPDATE message” only when the radio access network supports the “Additional Dynamic Transport Format Information for CCCH.”