S-TMSI Reporting Method for LTE Random Access
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Solution Overview
Problem
In LTE systems, the temporary mobile subscriber identity (S-TMSI) exceeds 40 bits, making it impossible for terminal devices to report this identity to the network device during the random access procedure in future mobile communication systems like New Radio (NR), as the existing protocol limits the S-TMSI length to 40 bits.
Innovation Solution
A method and device that allow a terminal device to select M bits from the S-TMSI when its length exceeds 40 bits, enabling the transmission of these selected bits in a first message (MSG 3) to a network device, thereby supporting S-TMSI lengths beyond the existing protocol limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the S-TMSI length is increased to exceed 40 bits to support future mobile communication systems, then the identity identification capability is improved, but the terminal device cannot report the S-TMSI to the network device during random access procedure
Solution Approach 1:
The patent segments the S-TMSI reporting process into two parts: first reporting M bits (where M≤40) in MSG3 during random access, and then reporting the remaining bits in a subsequent message. This segmentation allows the system to support longer S-TMSI while maintaining compatibility with existing protocol constraints.
Solution Approach 2:
The patent performs preliminary action by first establishing the random access connection and reporting partial S-TMSI information in MSG3 before completing the full S-TMSI reporting in a later message. This preliminary reporting enables the network to identify and manage the terminal device even before receiving the complete S-TMSI.
2Loss of information
If the MSG3 length is increased to accommodate full S-TMSI exceeding 40 bits, then the complete identity can be reported, but the message length exceeds the existing protocol limit of 56 bits
Solution Approach 1:
The patent divides the S-TMSI information into two segments: M bits reported in MSG3 (keeping it within the 56-bit protocol limit) and the remaining bits reported in a subsequent message. This segmentation resolves the contradiction between information completeness and message length constraints.
Solution Approach 2:
The patent applies partial action by reporting only M bits of the S-TMSI in MSG3 rather than the complete S-TMSI, allowing the message to fit within protocol limits while still providing sufficient identification capability. The remaining bits are reported partially in a subsequent message.
3Adaptability or versatility
If the S-TMSI length is limited to 40 bits to maintain protocol compatibility, then the random access procedure works smoothly, but future mobile communication systems cannot support longer identities
Solution Approach 1:
The patent creates a universal solution that works for both current 40-bit S-TMSI and future longer S-TMSI requirements. By reporting M bits in MSG3 followed by remaining bits in a subsequent message, the system maintains compatibility with existing protocols while enabling support for longer identities in future systems.
Solution Approach 2:
The patent introduces dynamic adaptability by allowing the system to handle variable S-TMSI lengths. The terminal device determines whether to report M bits or the complete S-TMSI based on the actual length, making the protocol flexible enough to adapt to both current and future requirements.
Data Source
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AI summary
A method and a device for reporting an identity are provided according to embodiments of the present disclosure. The method includes: when determining that the number of bits of a temporary mobile subscriber identity (S-TMSI) is greater than M, selecting M bits from the bits of the S-TMSI, M being a predetermined positive integer; and transmitting a first message 3 (MSG 3) to a network device, where the first MSG 3 carries the M bits.