Peer-to-Peer Resource Scheduling with Availability Indicators
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Solution Overview
Problem
In conventional device-to-device (D2D) systems, there is significant control overhead due to repeated resource contention for wireless communications, leading to inefficient use of resources and high signaling overhead.
Innovation Solution
Implementing methods and apparatus for peer-to-peer communications that allow wireless terminals to request and reserve resources for extended periods, with the option to relinquish unused resources, using resource availability indicators to enable other devices to utilize these resources, either with base station assistance or in a decentralized manner without central control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If devices repeatedly contend for resources in conventional D2D systems, then resource allocation can be dynamically adjusted, but signaling overhead increases significantly and resource utilization decreases
Solution Approach 1:
The system performs preliminary resource reservation where a device reserves resources for a future time period in advance. This allows the resource to be pre-allocated and reduces the need for repeated contention and signaling at each time instance, thereby reducing signaling overhead while maintaining adaptability through the ability to modify or release reservations before they take effect.
Solution Approach 2:
The resource reservation system allows dynamic modification of reservations before they become active. A device can release or modify its reserved resources prior to the reserved time period, enabling flexible adaptation to changing communication needs without requiring repeated contention processes, thus reducing signaling overhead while preserving adaptability.
2Productivity
If devices reserve resources for extended periods, then resource utilization improves and contention frequency decreases, but flexibility to adapt to changing communication needs reduces
Solution Approach 1:
The reservation system implements dynamic flexibility by allowing devices to release or modify their reserved resources before the reserved time period begins. This means that while resources are reserved for extended periods to improve utilization and reduce contention, the system remains adaptable because reservations are not rigid - they can be adjusted based on changing communication requirements.
Solution Approach 2:
The system incorporates feedback mechanisms where devices can monitor their communication needs and the status of reserved resources. Based on this feedback, devices can decide to release or modify reservations before they become active, ensuring that resource allocation remains aligned with actual communication demands while maintaining the benefits of extended-period reservation.
3Loss of information
If resources are assigned for long durations, then the number of assignment requests decreases and signaling overhead is reduced, but the ability to respond to sudden resource availability changes diminishes
Solution Approach 1:
The system uses preliminary resource reservation where devices reserve resources in advance for future time periods. This preliminary action reduces the need for frequent assignment requests and associated signaling overhead. At the same time, the system maintains responsiveness by allowing devices to release or modify reservations before they become active, enabling quick adaptation to sudden resource availability changes without requiring immediate re-contention.
Data Source
AI summary
A wireless communications device supporting peer-to-peer communications acquires peer-to-peer communications resources for an extended period of time. In some embodiments, a base station assigns the resources to the device, while in other embodiments, the device reserves, e.g., self-assigns peer-to-peer communications resources for an extended period of time. The wireless communications device decides that it will not be using an acquired peer-to-peer communications resources, e.g., a particular acquired peer-to-peer traffic segment. The wireless communications device transmits a resource availability indicator indicating that it will not be using the particular peer-to-peer communications resource. Another wireless communications device, which detects the resource availability indicator, may use the peer-to-peer communications resource which is not be used by the device to which it is assigned.