D2D Link Scheduling via Buffer and Power Headroom Reports
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing device-to-device (D2D) communication, particularly in allocating radio resources and optimizing transmission power, which leads to resource wastage and interference.
Innovation Solution
A method for D2D data transmission in wireless communication systems, involving a first terminal establishing a D2D link with a second terminal, transmitting scheduling requests and buffer status reports to a base station, and receiving scheduling information to transmit D2D data based on allocated resources and power headroom reports, effectively allocating radio resources and optimizing transmission power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If D2D communication is implemented without proper resource allocation mechanisms, then device-to-device data transmission can be established, but radio resource wastage and interference occur
Solution Approach 1:
The patent implements feedback mechanisms through Buffer Status Reports (BSR) and Power Headroom Reports (PHR) that provide real-time information about terminal device buffer states and power conditions. The base station uses this feedback to dynamically adjust resource allocations and power control parameters, optimizing D2D communication efficiency while minimizing resource wastage.
Solution Approach 2:
The patent introduces dynamic resource allocation and power control mechanisms where the base station continuously adjusts scheduling decisions based on real-time channel conditions, buffer status, and power headroom information. This dynamic adaptation allows the system to optimize performance under varying conditions while reducing unnecessary resource consumption.
2Reliability
If D2D communication is implemented without proper power control, then device-to-device data transmission can be established, but interference increases and transmission reliability decreases
Solution Approach 1:
The patent employs Power Headroom Reports (PHR) as a feedback mechanism where terminal devices report their power status to the base station. The base station uses this information to control transmission power levels, ensuring reliable communication while minimizing interference to other cells and uplink transmissions.
Solution Approach 2:
The patent dynamically adjusts transmission power parameters based on PHR feedback and scheduling decisions. By changing power parameters adaptively rather than using fixed levels, the system achieves reliable D2D communication while reducing harmful interference through optimized power control.
3Ease of operation
If separate SR resources are allocated for uplink and D2D links, then scheduling requests can be transmitted independently, but resource allocation complexity increases
Solution Approach 1:
The patent segments SR resources into separate configurations for uplink and D2D links, allowing independent scheduling request transmission for each link type. This segmentation enables clear differentiation between uplink data requests and D2D communication requests, simplifying the scheduling process despite the increased resource configuration.
Solution Approach 2:
The base station acts as an intermediary that manages the separate SR resource configurations and translates terminal device requests into appropriate scheduling decisions. This intermediary role simplifies the overall system operation by centralizing the complexity of managing multiple SR resources at the base station rather than at the terminal devices.
Data Source
AI summary
A method for transmitting device-to-device (D2D) data in a wireless communication system is provided. A first terminal establishes a D2D link with a second terminal. The first terminal transmits a scheduling request (SR) for an uplink and an SR for the D2D link to a base station. The first terminal receives, from the base station, scheduling information on the D2D link determined on the basis of the SR for the D2D link. The first terminal transmits D2D data to the second terminal on the basis of the scheduling information