Partial UE Control for D2D Resource Allocation
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Solution Overview
Problem
Current device-to-device (D2D) communication systems face challenges in efficiently managing D2D communication scenarios, particularly in terms of time and frequency synchronization, resource allocation, and control methods, which affect the performance and reliability of D2D links in cellular networks.
Innovation Solution
A partial UE control method for D2D communication that includes detecting grant information, demodulating data, transmitting ACK/NACK signals, measuring and reporting channel state information, and configuring sounding reference signals, while also managing resource allocation and hybrid automatic repeat request processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If centralized control by a base station is used for D2D communication, then resource allocation efficiency is improved, but system complexity and control overhead increase
Solution Approach 1:
The patent segments control functions between the base station and UEs. The base station performs centralized resource allocation and grant transmission, while UEs autonomously perform demodulation, ACK/NACK transmission, and channel state reporting. This segmentation reduces base station complexity while maintaining resource allocation efficiency.
Solution Approach 2:
The patent introduces grant information as an intermediary signal that carries resource allocation decisions from the base station to UEs. This grant information includes demodulation reference signal parameters, enabling UEs to autonomously demodulate data without direct base station intervention, thus reducing control overhead.
2Device complexity
If distributed control by UEs is used for D2D communication, then system complexity is reduced, but resource allocation efficiency and synchronization performance deteriorate
Solution Approach 1:
The base station performs preliminary actions by transmitting grant information that pre-configures demodulation reference signals and resource allocation parameters. This allows UEs to autonomously perform subsequent operations (demodulation, ACK/NACK transmission) without real-time base station intervention, achieving both simplicity and efficiency.
Solution Approach 2:
The patent implements feedback mechanisms where UEs transmit ACK/NACK signals and channel state information to the base station. This feedback enables the base station to optimize resource allocation decisions while UEs maintain operational autonomy, balancing complexity and efficiency.
3Productivity
If grant information and data are multiplexed in the same subframe, then resource utilization is improved, but detection reliability and demodulation accuracy may deteriorate
Solution Approach 1:
The patent applies local quality by providing UE-specific grant information that contains demodulation reference signal parameters tailored to each UE's channel conditions and resource allocation. This localized configuration enables reliable demodulation even when grant information and data are multiplexed in the same subframe.
Solution Approach 2:
The grant information acts as an intermediary that carries critical demodulation parameters (reference signal resources, MCS, resource allocation). By embedding these parameters in the grant, the system enables accurate demodulation despite the complexity of multiplexing grant and data in the same subframe.
4Productivity
If D2D communication is implemented in cellular networks, then network capacity and data throughput are improved, but time and frequency synchronization requirements increase system complexity
Solution Approach 1:
The patent merges D2D communication with existing cellular network infrastructure by reusing base station resource allocation mechanisms, synchronization signals, and control channels. UEs leverage existing cellular synchronization to perform D2D communication, eliminating the need for separate synchronization systems and reducing overall complexity.
Solution Approach 2:
The grant information mechanism serves multiple functions: resource allocation, demodulation parameter configuration, and implicit synchronization reference. This multi-functionality reduces the need for separate synchronization mechanisms, simplifying the system while enabling D2D communication in cellular networks.
Data Source
AI summary
A device to device (D2D) communication method based on a partial device control is disclosed. According to the present invention, the D2D communication method and, particularly, to a partial device control method for D2D communication a relates to, and provides a D2D resource allocation and release method, a D2D HARQ process operating method, a link adaptation method comprising D2D link power control and adaptive modulation and coding (AMC), a D2D control information signaling method, a CSI reporting method for D2D communication, and contents of a CSI report. The present invention can enhance the advantages of and compensate for the disadvantages of both methods through the combination of a base station control a base station control type D2D communication method and a device control type D2D communication method.