Uplink Data Decoding During Radio Access Device Handover
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Solution Overview
Problem
After a terminal switches serving radio access devices in an inactive state, the new serving radio access device often cannot correctly decode uplink data due to using an incorrect key parameter for encryption.
Innovation Solution
The serving radio access device notifies the terminal of the key parameter used for encrypting uplink data or instructs it to deduce the key, ensuring correct decryption and transmission of data packets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the terminal uses a key parameter allocated by the serving radio access device before switching or obtained through negotiation, then the terminal can maintain connection during movement, but the switched serving radio access device cannot correctly decode uplink data from the terminal
Solution Approach 1:
The patent applies preliminary action by having the terminal obtain the key parameter from the new serving radio access device before actually switching to it. The terminal stores this key parameter in advance, so when the switch occurs, the terminal already possesses the correct encryption key for the new device, ensuring immediate successful data transmission without decoding failures.
2Loss of energy
If the terminal remains in inactive state to save network resources, then network resource consumption is reduced, but the terminal cannot establish proper encryption for uplink data transmission to the new serving device
Solution Approach 1:
The patent applies self-service by enabling the terminal to autonomously obtain and store the key parameter from the new serving radio access device while remaining in inactive state. The terminal independently manages its own encryption credentials without requiring full connection activation, thus saving network resources while ensuring encryption capability is available when needed.
Data Source
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AI summary
Embodiments of the present invention provide an information transmission method. In this method, a terminal moves from coverage of a first radio access device to coverage of a second radio access device when the terminal in an inactive state; and when determining that a radio access device that allocates a terminal identifier is not the second radio access device, the second radio access device notifies the terminal of a key parameter to be used, or instructs the terminal to determine a new key according to a key obtaining manner negotiated between the terminal and the first radio access device, to retransmit uplink data or transmit new uplink data. This avoids a case in which the second radio access device may incorrectly decode the uplink data.