D2D Resource Allocation via Interference Detection
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Solution Overview
Problem
Fourth generation mobile communication systems face challenges in managing resource allocation for device-to-device communications, particularly in scenarios where devices are outside network coverage, leading to potential interference and resource overlap issues that can affect communication reliability, especially for public safety applications.
Innovation Solution
A communications system where devices detect potential interference in the wireless access interface and provide an indication to the infrastructure equipment, allowing it to reallocate resources, either directly or through a controlling entity, to mitigate interference and ensure reliable communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices perform device-to-device communication outside network coverage, then communication reliability is improved, but resource allocation complexity increases
Solution Approach 1:
The patent introduces an intermediary mechanism where user equipment acts as a relay to report interference information to the infrastructure equipment. This mediator approach allows devices outside network coverage to communicate reliably while distributing the resource allocation complexity across multiple devices rather than concentrating it in a single controller.
Solution Approach 2:
The system implements feedback loops where user equipment continuously monitors and reports interference conditions to the infrastructure equipment. This feedback mechanism enables dynamic resource allocation adjustments based on real-time channel conditions, resolving the contradiction between maintaining communication reliability and managing resource allocation complexity.
2Productivity
If infrastructure equipment allocates resources for device-to-device communication, then communication efficiency is improved, but interference increases
Solution Approach 1:
The patent implements dynamic resource allocation where the infrastructure equipment adjusts resource assignments based on real-time interference reports from user equipment. This dynamic approach allows the system to maintain high communication efficiency by allocating resources when needed while avoiding interference by reallocating or releasing resources when interference is detected.
Solution Approach 2:
The system changes resource allocation parameters dynamically based on interference conditions. When interference is reported, the infrastructure equipment modifies parameters such as frequency assignments, time slots, or power levels to reduce interference while maintaining communication efficiency in other areas.
3Quantity of substance
If devices use same resources for uplink and device-to-device communication, then resource utilization is improved, but interference detection becomes difficult
Solution Approach 1:
The patent enables user equipment to perform self-service interference detection by monitoring the resources they are already using for device-to-device communication. Devices autonomously detect interference conditions and report them to the infrastructure equipment, maintaining high resource utilization while solving the interference detection problem through distributed self-monitoring.
Data Source
AI summary
A communications system comprising a plurality of a communications devices and an infrastructure equipment. The infrastructure equipment is configured to communicate with one or more of the plurality of communication devices via a wireless access interface and the plurality of communications devices are configured to perform device-to-device communication with one or more others of the plurality of communications devices via the wireless access interface and to communicate with the infrastructure equipment via the wireless access interface. One of the plurality of communications devices is configured to transmit data in resources of the wireless access interface to one or more of the communications devices and one or more of the communications devices are configured to detect signals in the wireless access interface from the infrastructure equipment, the signals indicating potential interference in the wireless access interface, and to provide, in response to detecting the signals, an indication of the resources of the wireless access interface to the infrastructure equipment.