Coordinated Radio Resource Assignment with Transmission Point Blanking
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Solution Overview
Problem
Modern mobile radio systems with a frequency reuse factor of one face interference issues due to neighboring base stations, leading to degraded signal-to-interference and noise ratio (SINR), which can result in low performance and service interruptions for mobile stations.
Innovation Solution
A method for coordinated scheduling with transmission point blanking, where a coordinator calculates metric values for radio resource assignments assuming active and muted base stations, selecting the highest metric value to optimize resource allocation and reduce interference, thereby improving SINR and network performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If all base stations use full system bandwidth with frequency reuse factor of one, then spectrum usage efficiency is improved, but interference power received by mobile stations increases
Solution Approach 1:
The system segments the frequency spectrum into multiple resource blocks and assigns different subsets to different base stations. Instead of all base stations using the full bandwidth simultaneously, the available spectrum is divided and allocated to individual base stations based on coordination decisions, thereby reducing mutual interference while maintaining efficient spectrum utilization.
Solution Approach 2:
The coordination mechanism operates periodically, with base stations exchanging information about their intended transmission schemes at regular intervals. This periodic coordination allows the system to dynamically adjust resource block assignments and muting patterns over time, optimizing the balance between spectrum efficiency and interference reduction in different traffic conditions.
2Object-affected harmful factors
If coordinated scheduling with transmission point blanking is implemented, then interference is reduced and SINR is improved, but device complexity increases
Solution Approach 1:
A central coordination entity is introduced as an intermediary between base stations to manage the coordination process. This intermediary collects transmission scheme information from multiple base stations, makes centralized scheduling decisions about resource block assignments and muting patterns, and distributes the coordinated schedules back to the base stations. This approach simplifies individual base station complexity while achieving system-wide interference reduction.
Solution Approach 2:
The coordination function is extracted from individual base stations and centralized in a separate coordination entity. By removing the complex coordination logic from the base stations themselves and placing it in a dedicated central entity, the patent reduces the computational burden and implementation complexity at the base station level while maintaining the benefits of coordinated scheduling and transmission point blanking.
3Device complexity
If decentralized coordination scheme is used where base stations have equal rights, then implementation complexity is reduced, but coordination efficiency deteriorates
Solution Approach 1:
The patent introduces asymmetry in the coordination scheme by designating a leading base station among the coordinated base stations. This leading base station has enhanced responsibilities including making final scheduling decisions when conflicts occur and having priority in resource allocation. This asymmetric structure improves coordination efficiency by providing clear decision-making hierarchy while maintaining relatively simple implementation compared to fully centralized approaches.
Data Source
AI summary
A method for coordinated scheduling with transmission point blanking of a plurality of radio resources includes: a) calculating a first metric value for each combination of a mobile station of a network and each of a plurality of radio resources; b) calculating a second metric value for each combination under the assumption that at least one of the at least two base stations which is not connected to the respective mobile station using a concerned radio resource is muted; c) selecting the highest calculated metric value; d) determining whether or not to assign the radio resource to the mobile station corresponding to the highest metric value; e) setting the other metric values corresponding to the radio resource to a predefined metric value; and f) repeating steps c) to e) for the next highest metric value until all metric values are set to the predefined metric value.