Terminal RRC-Inactive Communication With Base Station Change Detection
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Solution Overview
Problem
In the RRC_INACTIVE state of 5G wireless communication, terminal devices face inefficiencies due to the need to transition to RRC_CONNECTED state for data transmission when moving to a new base station within the RNA, leading to signaling overhead and degraded communication efficiency.
Innovation Solution
The terminal device monitors for changes in the base station to which it should transmit signals by holding an MA signature from the last connected base station, determining whether to stay in RRC_INACTIVE or transition to RRC_CONNECTED based on this information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device transitions to RRC_CONNECTED state to transmit data when moving to a new base station within RNA, then reliable data transmission is ensured, but communication efficiency degrades due to processing overhead
Solution Approach 1:
The patent applies dynamics by making the terminal device's state transition flexible rather than fixed. The device dynamically determines whether to transition to RRC_CONNECTED or remain in RRC_INACTIVE based on real-time conditions such as whether the target base station holds the MA signature. This dynamic decision-making mechanism resolves the contradiction by adapting the connection state to actual transmission needs, ensuring reliability when necessary while maintaining efficiency when possible.
Solution Approach 2:
The patent utilizes parameter changes by modifying the terminal device's operational parameters (RRC state, MA signature validity) based on changing conditions. When the target base station possesses the MA signature, the device maintains RRC_INACTIVE state with updated parameters; when the signature is unavailable, it transitions to RRC_CONNECTED. This parameter-based adaptation allows the system to balance reliability and efficiency by changing operational parameters rather than always transitioning states.
2Productivity
If the terminal device remains in RRC_INACTIVE state and uses held MA signature for data transmission, then communication efficiency is improved, but data transmission reliability may deteriorate when the target base station does not hold the MA signature
Solution Approach 1:
The patent applies preliminary action by having the terminal device check whether the target base station holds the MA signature before attempting data transmission in RRC_INACTIVE state. This preliminary verification prevents failed transmission attempts and ensures that the device only uses the held MA signature when it is valid and recognized by the target base station, thereby maintaining both efficiency and reliability.
Solution Approach 2:
The patent implements feedback by having the terminal device determine whether the target base station holds the MA signature and use this information to decide on the transmission approach. The feedback mechanism (checking signature availability) allows the device to adjust its transmission strategy accordingly, ensuring reliability by avoiding transmissions with invalid signatures while maintaining efficiency by using held signatures when valid.
3Reliability
If the terminal device transitions to RRC_CONNECTED state each time data needs to be transmitted, then data transmission reliability is ensured, but power consumption increases due to frequent state transitions
Solution Approach 1:
The patent applies dynamics by making the state transition decision adaptive rather than static. The terminal device dynamically evaluates whether the target base station holds the MA signature and only transitions to RRC_CONNECTED when necessary. This dynamic approach reduces unnecessary state transitions and associated power consumption while ensuring reliability is maintained when the held signature is invalid.
Solution Approach 2:
The patent utilizes parameter changes by modifying the operational state parameter (RRC state) based on the validity of the MA signature parameter. When the signature is valid, the device remains in RRC_INACTIVE, consuming less power; when invalid, it transitions to RRC_CONNECTED. This parameter-based control mechanism balances power consumption and reliability by changing states only when the signature parameter indicates necessity.
Data Source
AI summary
A terminal comprises a function capable of operating in a plurality of states that include a first state in which a connection with a base station has been established, and a second state in which a connection with a base station has not been established, but the base station holds information regarding the terminal device. After starting operation in the second state from a state in which the terminal operates with a first base station in the first state, if predetermined information that enables communication with the first base station in the second state and that has been acquired from the first base station in the first state is held, the terminal determines whether a signal transmission target has changed from the first base station to a second base station device, and performs communication according to a result of the determination.