D2D Communication Ciphering Key Management for LTE Reliability
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Solution Overview
Problem
In wireless communication systems with central control, such as LTE, the handling of data transmission and reception between user equipment (UEs) via proximity service direct communication is unclear when the communication is terminated due to reconfiguration or radio link failure, requiring specific ciphering algorithms, PDCP parameter settings, and status reports.
Innovation Solution
The method involves using different ciphering keys for data transmission between UEs and eNBs in proximity service direct communication, and resetting PDCP parameters, including header compression and status reporting, to ensure seamless data transfer during reconfiguration and radio link failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If proximity service direct communication is terminated due to reconfiguration or radio link failure, then data transmission between UEs must be reestablished through eNB, but the handling of ciphering algorithms, PDCP parameters, and status reports becomes unclear and complex
Solution Approach 1:
The patent applies preliminary action by pre-configuring PDCP parameters and ciphering algorithms before communication termination occurs. When proximity service direct communication is terminated, the UE already has the necessary parameters ready to quickly reestablish communication through eNB without complex real-time negotiations, thus reducing protocol handling complexity while maintaining reliability
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting PDCP parameters and ciphering algorithms based on the communication state. When transitioning from direct UE-to-UE communication to eNB-mediated communication, specific parameters are changed according to pre-defined rules, simplifying the reestablishment process while ensuring secure and reliable data transmission
2Productivity
If PDCP re-establishment is performed after reconfiguration or radio link failure, then data transfer can resume, but ciphering keys and PDCP parameters must be reset and reconfigured
Solution Approach 1:
The patent applies preliminary action by pre-preparing ciphering keys and PDCP parameters before reconfiguration or radio link failure occurs. This allows the UE to quickly resume data transfer after termination without spending time on complex real-time key generation and parameter negotiation, thus reducing reconfiguration time while maintaining data transfer efficiency
Solution Approach 2:
The patent uses copying by reusing previously established ciphering keys and PDCP parameters from the direct communication phase where possible, rather than generating entirely new parameters. This copying approach reduces the time required for reconfiguration while ensuring security through selective parameter updates
Data Source
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AI summary
A method of handling data transmission and reception in device to device communication for a first communication device in a wireless communication system is disclosed. The method comprises connecting to a network of the wireless communication system, using a first ciphering key to cipher a first plurality of data blocks in a communication path corresponding to the second communication device, wherein the communication path is used for transmitting the first plurality of data blocks to the second communication device and is not traversing the network, being configured to release the communication path by the network, and using a second ciphering key different to the first ciphering key to cipher a second plurality of data blocks in a connection corresponding to the network, wherein the second plurality of data blocks include data transmitted to the second communication device.