LTE Direct Device-to-Device Communication
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Solution Overview
Problem
Existing communication methods between user devices, such as smartphones, either rely on costly wireless telecommunications networks or use direct methods like Wi-Fi Direct or Bluetooth, which face limitations in range, battery efficiency, and interference issues.
Innovation Solution
The establishment of a device-to-device (D2D) connection using LTE Direct, which allows user devices to communicate directly without a network, leveraging a licensed spectrum for reduced interference and longer range, while maintaining low power consumption and enhanced security through configuration parameters and security key generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Wi-Fi Direct or Bluetooth is used for direct device-to-device communication, then network dependency is reduced, but communication range is limited and interference issues occur
Solution Approach 1:
The patent changes the frequency spectrum parameter from unlicensed bands (Wi-Fi Direct, Bluetooth) to licensed LTE spectrum. This parameter change enables longer communication range and reduced interference while maintaining direct device-to-device communication capability, resolving the contradiction between communication reliability and range.
2Reliability
If LTE network is used for communication, then communication range and reliability are improved, but communication cost increases
Solution Approach 1:
The patent extracts the communication function from the traditional LTE network infrastructure and implements it directly between user devices using LTE Direct. This eliminates the need for network intermediaries and associated costs while maintaining LTE's reliability and coverage advantages, resolving the contradiction between communication reliability and cost.
3Adaptability or versatility
If direct device-to-device communication is implemented, then network dependency is reduced, but interference and battery efficiency worsen
Solution Approach 1:
The patent changes the spectral parameter from unlicensed to licensed LTE bands, which provides guaranteed quality of service and reduced interference through exclusive rights to the frequency band. This enables independent device-to-device communication while eliminating the interference problems associated with unlicensed spectrum sharing.
Data Source
AI summary
Techniques described herein may be used to enable a user device (e.g., a smartphone, a tablet computer, etc.) to access network services without having to be connected to a network (e.g., a wireless telecommunications network). A first user device may communicate discovery packets in search of other user devices to which the first user device may connect. The first user device may identify a second user device (as a result of sending the discover packets). The first and second user devices may obtain configuration parameters (e.g., a communication channel allocation, encryption keys, synchronization information, etc.) and may establish a D2D connection based on the configuration parameters. The D2D connection may enable the first and second user devices to communicate with another as though the user devices were connected to a wireless telecommunications network (e.g., via telephone calls, video calls, simple messaging services (SMS) messages, instant messages, etc.).