D2D Resource Indication via Control Information
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Solution Overview
Problem
In Device to Device (D2D) communication systems, the transmitting UE cannot effectively indicate the used D2D data channel resource, which hinders efficient resource allocation and data transmission.
Innovation Solution
The UE indicates D2D data channel resources through D2D data channel resource indication information in D2D control indication information or index information, allowing for flexible allocation of time and frequency domain resources, including bitmap and timing pattern indications, to explicitly or implicitly convey resource allocations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmitting UE uses traditional cellular resource allocation methods (eNB scheduling through PDCCH), then resource allocation is centralized and controlled, but the UE cannot effectively indicate D2D data channel resources to the receiving UE
Solution Approach 1:
The patent introduces D2D control information as an intermediary message that carries resource indication information between UEs. This control information includes fields such as resource allocation type, resource block assignments, and timing information, enabling the transmitting UE to indicate D2D data channel resources to the receiving UE without requiring eNB direct intervention for each indication
Solution Approach 2:
The patent employs copying mechanisms where the resource allocation information is first determined by the eNB for uplink resources, then copied and adapted into D2D control information format. This allows the transmitting UE to indicate resources that mirror the eNB-scheduled uplink resources, ensuring consistency while enabling direct UE-to-UE indication
2Productivity
If D2D communication uses direct air interface transmission between UEs, then radio spectrum resources are saved and network load is reduced, but there is no effective method for the transmitting UE to indicate used data channel resources
Solution Approach 1:
The patent segments the resource indication process into multiple independent fields within the D2D control information structure. These segments include resource allocation type indication, resource block assignment fields, timing offset indicators, and frequency offset indicators. This segmentation allows flexible combination of fields to indicate different resource configurations while maintaining ease of operation
Solution Approach 2:
The patent utilizes parameter changes in the D2D control information fields to indicate different resource allocation scenarios. By varying parameters such as resource block indices, timing offsets, and frequency offsets within the control message, the transmitting UE can dynamically indicate the specific D2D data channel resources being used, making resource indication as easy as configuring message parameters
3Productivity
If the eNB schedules and indicates PDSCH resources through PDCCH in cellular communication, then downlink resource allocation is efficient, but this method cannot be used for D2D data channel resource indication
Solution Approach 1:
The patent creates a universal resource indication mechanism that functions both for traditional cellular communication and D2D communication. The D2D control information structure is designed to be versatile, supporting multiple resource allocation modes (frequency selective, time selective, frequency and time selective) and can be adapted to different D2D scenarios including direct communication, relay communication, and group communication, making it universally applicable across various communication modes
Data Source
AI summary
The present document discloses a communication data sending method and device, and user equipment, herein the communication data sending method includes: UE indicating a D2D data channel resource through D2D data channel resource indication information in D2D control indication information and/or index information corresponding to the D2D control indication information; and the UE sending D2D communication data on the D2D data channel resource. Through the present document, the problem that a transmitting UE for D2D communication is unable to indicate the used D2D data channel resource by using an eNB scheduling indication resource in the cellular communication is solved, and the indication of the D2D data channel resource is realized.