Radio Resource Allocation for Near-Far Interference Mitigation
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Solution Overview
Problem
The near-far problem in radio communication scenarios leads to interference when a device receives a signal from a distant transmitter, as a closer interfering transmitter's signal has higher received strength, corrupting the desired signal, particularly problematic in autonomous driving where information loss can be critical.
Innovation Solution
A resource allocation routine that allocates radio resources based on the distance between terminal devices, separating resources in frequency and/or time to mitigate interference, where proximate devices use proximate resources and distant devices use distant resources, implemented by a scheduler that identifies groupings and allocates resources accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radio resources are allocated without considering device distance, then resource allocation is simple and fast, but interference occurs when distant transmitters send signals in the presence of closer interfering transmitters
Solution Approach 1:
The patent applies local quality by allocating radio resources differently based on the spatial location and distance relationships of terminal devices. Specifically, the network device determines distances between terminal devices and allocates radio resources with appropriate separation for distant devices while allowing closer devices to use more proximate resources. This location-aware resource allocation ensures that terminal devices receiving signals from distant transmitters are assigned resources sufficiently separated from interfering signals of closer transmitters, thereby improving signal reception reliability without uniformly increasing system complexity.
2Reliability
If radio resources are separated in frequency and time for all devices, then interference is reduced, but resource utilization efficiency decreases
Solution Approach 1:
The patent implements local quality by applying different resource allocation strategies based on the specific distance relationships of each terminal device. The network device calculates distances between terminal devices and dynamically determines the appropriate separation of radio resources in frequency and time domains. For terminal devices that are far apart, greater resource separation is applied to prevent interference, while for closer devices, less separation is needed, allowing more aggressive resource reuse. This differentiated approach ensures communication reliability for distant devices while maximizing overall resource utilization efficiency across the network.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the separation parameters of radio resources (frequency offset, time offset) based on the distance between terminal devices. The network device modifies these resource allocation parameters adaptively rather than using fixed separation values. When terminal devices are distant, larger frequency and time separations are applied; when devices are closer, smaller separations are used. This parameter adaptation resolves the contradiction by ensuring sufficient interference protection for distant devices while allowing tighter resource packing for closer devices, thereby maintaining both communication reliability and resource utilization efficiency.
Data Source
AI summary
A method of allocating radio resources includes identifying a first grouping of terminal devices and a second grouping of terminal devices based on reporting information that indicates terminal device positions, selecting first radio resources and second radio resources based on a distance between the first grouping and the second grouping, and assigning the first radio resources to the first grouping and assigning the second radio resources to the second grouping.