D2D Scheduling Assignment Signal for Resource Conflict Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In device-to-device (D2D) communication, existing methods face challenges in efficiently managing resource allocation and preventing conflicts between terminals, particularly in emergency scenarios where network services are disrupted, leading to increased complexity and potential resource conflicts.
Innovation Solution
A method and apparatus that utilize a scheduling assignment (SA) signal with first and second information to indicate resource usage and availability, allowing terminals to exchange control information without additional control channels, enabling efficient resource management and conflict prevention through channel sensing signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If central resource allocation is used with a particular terminal performing base station functions, then radio resource scheduling and conflict prevention is improved, but terminal complexity and operational burden increases
Solution Approach 1:
The patent enables terminals to autonomously perform resource allocation functions through distributed scheduling. Each terminal independently senses channel occupancy and allocates resources to other terminals without requiring a centralized base station or resource allocating entity, thereby eliminating the complexity burden while maintaining resource conflict prevention
Solution Approach 2:
The patent introduces a scheduling assignment (SA) signal as an intermediary mechanism that carries resource allocation information between terminals. This SA signal enables distributed terminals to exchange scheduling information and coordinate resource usage without requiring complex base station-like functionality, resolving the contradiction between reliability and device complexity
2Reliability
If additional control channels are defined for resource allocation information transmission, then resource allocation management is improved, but system complexity and signaling overhead increases
Solution Approach 1:
The patent merges resource allocation control information with existing data transmission channels. The scheduling assignment (SA) signal is transmitted along with data signals using the same physical resources, eliminating the need for separate control channels while maintaining effective resource allocation management through integrated signaling
Solution Approach 2:
The patent makes the SA signal multi-functional by enabling it to carry both data transmission and resource allocation control information simultaneously. This universal signal structure allows the system to manage resources effectively without requiring additional dedicated control channels, thereby reducing system complexity
3Reliability
If channel sensing signals are transmitted continuously to prevent resource conflicts, then resource conflict prevention is improved, but energy consumption and interference increases
Solution Approach 1:
The patent implements periodic channel sensing where terminals perform sensing at specific intervals rather than continuously. Terminals transmit and sense channel occupancy signals in periodic cycles, which prevents resource conflicts while significantly reducing energy consumption compared to continuous monitoring
Solution Approach 2:
The patent maintains continuous resource conflict prevention through coordinated periodic sensing among multiple terminals. By synchronizing sensing actions across the network, the system ensures continuous coverage and conflict prevention while each individual terminal operates only during its designated sensing periods, optimizing energy efficiency
Data Source
Figure 1(a)~1(c)
Figure 2
Figure 3
AI summary
The present invention relates to a method and an apparatus for transmitting control information for device-to-device (D2D) communication. A method for communicating between terminals of a transmission terminal according to an embodiment of the present invention comprises the steps of: determining whether transmission data corresponds to final transmission data; generating a first channel sensing signal including information indicating that the transmission data corresponds to final transmission when the transmission data is final transmission data; and transmitting the transmission data and the first channel sensing signal. According to an embodiment of the present invention, a channel sensing signal, which is necessarily required for a D2D operation of a distributed resource allocation scheme, is used to transmit the control information so that control information can be exchanged between terminals without introducing an additional control channel and signal.