D2D Communication Control via Network-Mediated Search Signal Activation
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Solution Overview
Problem
Current 3GPP standards do not provide specifications for effectively controlling Device to Device (D2D) communication, leading to compatibility issues between D2D communication and cellular communication in cellular mobile communication systems.
Innovation Solution
A communication control method that involves a user terminal transmitting communication request information to the network, the network sending start request information to another user terminal, and the second user terminal starting to wait for a search signal upon receiving this request, allowing for direct radio communication between user terminals while maintaining a radio connection with the network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If D2D communication is implemented without network control specifications, then direct communication between user terminals is enabled, but compatibility with cellular communication deteriorates
Solution Approach 1:
The network acts as an intermediary to control and coordinate D2D communication. The base station manages resource allocation, sends start request information to control terminals, and receives communication request information, ensuring that D2D operations are harmonized with cellular communication standards and preventing interference between the two communication modes
Solution Approach 2:
The system dynamically adjusts terminal states between D2D communication and cellular communication based on network conditions. Terminals can transition between active D2D communication and idle states, with the network controlling when terminals should be in each state through start request information and communication request management
2Reliability
If terminals continuously wait for search signals, then D2D communication can be established, but battery consumption increases
Solution Approach 1:
Instead of continuous waiting, terminals periodically check for start request information from the network and enter idle states between checks. The network controls when terminals should be active to search for communication partners, creating a periodic on-demand operation pattern that reduces energy consumption while maintaining communication capability
Solution Approach 2:
Terminals autonomously manage their communication state based on network instructions. When the network determines D2D communication is needed, it sends start request information to specific terminals, which then activate their search signal reception. This on-demand activation eliminates the need for continuous monitoring, allowing terminals to conserve energy during idle periods
3Reliability
If network controls D2D communication, then compatibility with cellular communication is improved, but network traffic increases
Solution Approach 1:
The patent extracts and separates D2D communication control from general cellular communication traffic. By creating a dedicated control mechanism where the network sends specific start request information only to terminals that need to engage in D2D communication, the system minimizes unnecessary network traffic while maintaining control oversight, rather than having the network manage all terminal communications
Data Source
AI summary
A communication control method used in a cellular mobile communication system that performs inter-terminal communication that is direct radio communication capable of being performed between user terminals in a state where a radio connection with a network is established, comprises a step of transmitting, by a first user terminal, to the network, communication request information indicating a desire to start the inter-terminal communication, a step of transmitting, by the network, to a second user terminal, start request information for starting waiting for a search signal, in a case where the second user terminal identified on the basis of the communication request information is stopping the waiting for the search signal for the inter-terminal communication, and a step of starting, by the second user terminal, waiting for the search signal upon receiving the start request information from the network.