D2D Resource Scheduling for Low Latency V2V
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Solution Overview
Problem
Existing D2D communication systems face challenges in achieving low latency, particularly in V2V services, due to scheduling period limitations and resource allocation conflicts, which can lead to failure in transmitting priority data.
Innovation Solution
A communication device with separate resource pools for control and data resources, where the scheduler selects resources based on signal intensity to transmit control and data information, ensuring low latency and avoiding resource conflicts by using distinct resources for priority and non-priority data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a scheduling period is used for D2D communication resource allocation, then resource management is simplified, but transmission latency increases
Solution Approach 1:
The resource pool is segmented into multiple individual resources rather than being allocated in fixed scheduling periods. Each resource can be independently selected and allocated, allowing devices to bypass the periodic scheduling structure and directly access available resources, thereby reducing transmission latency while maintaining manageable resource allocation through distributed selection mechanisms
Solution Approach 2:
Resources are pre-configured and made available in the resource pool before transmission needs arise. Devices can perform preliminary resource selection and reservation, allowing immediate transmission when data needs to be sent without waiting for the next scheduling period, thus reducing latency while keeping resource management systematic
2Adaptability or versatility
If communication devices autonomously select resources from a resource pool, then resource allocation flexibility increases, but resource conflicts occur
Solution Approach 1:
Devices monitor the resource pool to detect which resources are currently being used by other devices. This feedback mechanism allows autonomous resource selection while avoiding conflicts, as devices can sense occupied resources and select alternative available resources, maintaining both flexibility and transmission reliability
Solution Approach 2:
The resource selection process dynamically adjusts based on detected resource usage conditions. When conflicts are detected or resources are occupied, devices can change selection parameters to choose different resources, allowing flexible adaptation to current pool conditions while ensuring reliable transmission by avoiding conflicts
3Stability of the object's composition
If SA areas are inserted at prescribed time intervals, then control information transmission is regularized, but data transmission latency increases
Solution Approach 1:
The control and data transmission resources are segmented into separate independent pools. Control information can be transmitted through SA areas at regular intervals for stability, while data transmission uses separate resources that are not constrained by the SA period, allowing data to be transmitted immediately when needed without waiting for the next SA area, thus reducing data latency while maintaining control regularity
Solution Approach 2:
The system separates control plane and data plane transmissions into different resource dimensions. Control information occupies the time dimension with regular SA intervals, while data transmission utilizes an independent resource dimension with flexible allocation, allowing both functions to operate independently without the data transmission being constrained by control scheduling periodicity
Data Source
AI summary
A communication device supports a D2D (Device-to-Device) communication and includes a storage, a scheduler and a transmitter. The storage stores a first resource pool information that indicates first resource pool including control resources allocated to control information for transmitting data and a second resource pool information that indicates second resource pool including data resources allocated to data. The scheduler selects a first resource for transmitting control information from the first resource pool and selects a second resource for transmitting data from the second resource pool. The transmitter transmits the control information by using the first resource and transmit the data by using the second resource. The scheduler selects the second resource from the second resource pool according to a received signal intensity in at least one of resources included in the first resource pool and the second resource pool.