Inter-terminal D2D Communication Link Establishment
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Solution Overview
Problem
Current mobile terminals lack the capability for inter-terminal Device-to-Device (D2D) communication, both under cellular network control and in public safety scenarios, due to limited frequency spectrum resources and the need for new communication modes beyond conventional cellular functions.
Innovation Solution
A method and system enabling inter-terminal D2D communication by allowing terminals to initiate requests, detect compatibility, and establish D2D links using time-frequency resources, with network-side pre-judgment and control, applicable both under cellular network control and in public safety scenarios without cellular network coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional cellular communication function is used, then mobile terminals can communicate through base station, but inter-terminal direct communication capability is lacking
Solution Approach 1:
The terminal is designed with multi-functionality to support both conventional cellular communication and direct D2D communication modes. The terminal can switch between communicating through base station and direct terminal-to-terminal communication, making it universally applicable to different communication scenarios without requiring separate devices.
2Quantity of substance
If distributed bandwidth resources are used, then existing frequency spectrum is utilized, but bandwidth requirements cannot be met for future wireless communications
Solution Approach 1:
The patent introduces a new dimension for resource allocation by enabling direct terminal-to-terminal communication that operates independently from traditional base-station-controlled resource allocation. This creates an additional communication dimension that can utilize spectrum resources more efficiently and meet future bandwidth requirements without being constrained by existing distributed bandwidth limitations.
3Adaptability or versatility
If D2D communication capability is added to terminals, then inter-terminal direct communication is enabled, but existing terminals lack this capability
Solution Approach 1:
The patent incorporates D2D communication functionality into the terminal design from the outset, performing the necessary capability integration in advance. By designing terminals with built-in D2D communication modules and protocols预先 (in advance), the implementation becomes more straightforward during manufacturing, as the capability is already integrated rather than requiring complex post-manufacturing modifications.
Data Source
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AI summary
Disclosed are an inter-terminal device-to-device communication method and system, which relate to the technical field of wireless communications. The method includes that a source terminal initiates a communication request for device-to-device (D2D) communication with a destination terminal; according to the D2D communication request, whether the source terminal and the destination terminal can conduct the device-to-device communication is detected; if the detection result is that the source terminal and the destination terminal can conduct the device-to-device communication, a D2D communication link is established between the source terminal and the destination terminal; the source terminal and the destination terminal use the D2D communication link to conduct the device-to-device communication. The embodiments achieve the inter-terminal device-to-device communication, which are available to device-to-device communication under the control of a mobile network and also available under the condition of no mobile network, i.e., the field of public security.