Terminal Device D2D Cellular Communication Mode Configuration
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Solution Overview
Problem
Existing technologies have not adequately addressed the simultaneous performance of Device-to-Device (D2D) and cellular communication in terminal devices, leading to inefficiencies in communication processes.
Innovation Solution
A terminal device and communication method that enable efficient D2D communication by configuring multiple cells for cell aggregation, using specific physical channels and signals, and allowing the terminal device to select or be scheduled for resource allocation, supporting both EUTRAN coverage and out-of-coverage scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the terminal device performs both D2D and cellular communication simultaneously, then communication versatility is improved, but interference between signals occurs and resource allocation becomes complex
Solution Approach 1:
The patent segments resource allocation into separate D2D resources and cellular resources, with distinct resource pools and allocation mechanisms. D2D communication uses dedicated resource pools while cellular communication uses traditional scheduling, allowing simultaneous operation without complex joint allocation.
Solution Approach 2:
The patent implements dynamic resource allocation where the terminal device can flexibly switch between D2D and cellular communication modes based on service requirements. The resource allocation is dynamically adjusted through scheduling assignments that indicate whether to use D2D or cellular resources for each transmission.
2Adaptability or versatility
If D2D communication is enabled in addition to cellular communication, then communication functionality is improved, but signal interference increases
Solution Approach 1:
The patent separates D2D and cellular signals into different resource domains (frequency, time, or spatial), allowing both communications to occur simultaneously without mutual interference. The base station allocates orthogonal resources to prevent interference between D2D and cellular transmissions.
Solution Approach 2:
The base station acts as an intermediary that coordinates D2D resource allocation with cellular resource allocation. It provides scheduling assignments that indicate when and how to use D2D resources, ensuring that D2D transmissions do not interfere with ongoing cellular communications.
3Adaptability or versatility
If the terminal device supports both in-coverage and out-of-coverage D2D communication, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent implements a universal D2D communication framework that works in both in-coverage and out-of-coverage scenarios using the same basic mechanisms. The terminal device uses consistent resource selection and signal transmission procedures regardless of coverage status, with the base station providing coordination when available.
Solution Approach 2:
The terminal device performs autonomous resource selection and D2D communication operations without requiring complex mode-specific processing. The device can independently select resources from configured pools and manage its own D2D transmissions, reducing the need for complex control logic in the terminal.
Data Source
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AI summary
A terminal device that communicates with a different terminal device and an Evolved Universal Terrestiral Radio Access Network (EUTRAN) configures a mode 2 that is available for communication between terminal devices out of EUTRAN coverage and for communication between terminal devices in the EUTRAN coverage, as a mode for inter-terminal device communication, and, during a handover procedure, performs reception processing for communication between terminal devices in a mode 2.